diff options
206 files changed, 11593 insertions, 65041 deletions
diff --git a/BUILD/compile-pentium-valgrind-max b/BUILD/compile-pentium-valgrind-max index 016b698a970..14f57d24841 100755 --- a/BUILD/compile-pentium-valgrind-max +++ b/BUILD/compile-pentium-valgrind-max @@ -3,7 +3,7 @@ path=`dirname $0` . "$path/SETUP.sh" -extra_flags="$pentium_cflags $debug_cflags -DHAVE_purify" +extra_flags="$pentium_cflags $debug_cflags -USAFEMALLOC -DHAVE_purify" c_warnings="$c_warnings $debug_extra_warnings" cxx_warnings="$cxx_warnings $debug_extra_warnings" extra_configs="$pentium_configs $debug_configs" diff --git a/BitKeeper/etc/gone b/BitKeeper/etc/gone index 204044a2cc5..ad2ffda4d6e 100644 --- a/BitKeeper/etc/gone +++ b/BitKeeper/etc/gone @@ -443,6 +443,7 @@ BK|vio/vio-global.h|19700101030959|00021|c261412c01b2f4 BK|vio/vioelitexx.cc|19700101030959|00022|3eaba70da792a7fc BK|vio/violite.h|19700101030959|00023|58d2942a52ea7a83 BK|vio/viotypes.h|19700101030959|00027|f5a38e7326bd50f3 +BitKeeper/deleted/SCCS/s..del-makefile.w32 Sinisa@sinisa.nasamreza.org|=6|20010818122920|53462|33f33b0a159dc5d5 Sinisa@sinisa.nasamreza.org|mysql-test/r/sel000004.result|20020522121240|20995|360af2095c88cb8c Sinisa@sinisa.nasamreza.org|mysql-test/r/sel000004.result|20020522133259|25000|4b5fbc60d0d9754f diff --git a/BitKeeper/etc/logging_ok b/BitKeeper/etc/logging_ok index cc11f43b899..71388fba9c3 100644 --- a/BitKeeper/etc/logging_ok +++ b/BitKeeper/etc/logging_ok @@ -18,6 +18,7 @@ bk@admin.bk davida@isil.mysql.com gluh@gluh.(none) gluh@gluh.mysql.r18.ru +gweir@work.mysql.com heikki@donna.mysql.fi heikki@hundin.mysql.fi heikki@rescue. diff --git a/Build-tools/Do-compile b/Build-tools/Do-compile index 8695c72b913..1ab9835f758 100755 --- a/Build-tools/Do-compile +++ b/Build-tools/Do-compile @@ -74,12 +74,6 @@ if (@config_env > 0) $opt_config_env= join(" ", @config_env); } -if (@config_env > 0) -{ - chomp(@config_env); - $opt_config_env= join(" ", @config_env); -} - chomp($host=`hostname`); $full_host_name=$host; $connect_option= ($opt_tcpip ? "--host=$host" : ""); @@ -425,7 +419,7 @@ if ($opt_stage <= 9 && !$opt_no_test && !$opt_no_benchmark) rm_all($bench_tmpdir); rm_all("$opt_tmp") if ($new_opt_tmp); -log_system("$pwd/$host/bin/mysqladmin $mysqladmin_args -S $mysql_unix_port -u root shutdown"); +log_system("$pwd/$host/bin/mysqladmin $mysqladmin_args -S $mysql_unix_port shutdown"); print LOG "ok\n"; close LOG; print "$host: ok\n"; diff --git a/Docs/Makefile.am b/Docs/Makefile.am index 80832719893..7d1d2ee8cbd 100644 --- a/Docs/Makefile.am +++ b/Docs/Makefile.am @@ -27,7 +27,7 @@ EXTRA_DIST = $(noinst_SCRIPTS) $(BUILT_SOURCES) mysqld_error.txt \ all: $(targets) txt_files txt_files: ../INSTALL-SOURCE ../COPYING ../COPYING.LIB \ - INSTALL-BINARY # ../MIRRORS + INSTALL-BINARY CLEAN_FILES: $(BUILD_SOURCES) touch $(BUILD_SOURCES) @@ -254,8 +254,5 @@ INSTALL-BINARY: mysql.info $(GT) ../COPYING.LIB: mysql.info $(GT) perl -w $(GT) mysql.info "LGPL license" "Function Index" > $@ -#../MIRRORS: manual.texi $(srcdir)/Support/generate-mirror-listing.pl -# perl -w $(srcdir)/Support/generate-mirror-listing.pl manual.texi > $@ - # Don't update the files from bitkeeper %::SCCS/s.% diff --git a/Docs/ManualStyleGuidelines.wiki b/Docs/ManualStyleGuidelines.wiki deleted file mode 100644 index 9d2a869ba1a..00000000000 --- a/Docs/ManualStyleGuidelines.wiki +++ /dev/null @@ -1,282 +0,0 @@ -OriginalAuthor: Paul DuBois - -!!! ManualStyleGuidelines - -''Version 1.1'' - -!! Revision History - -* 2002-05-17 ArjenLentz - Version 1.0, Posted to Wiki -* 2002-06-03 ArjenLentz - Version 1.1, updates. - -!! MySQL Manual Style Guidelines - -Paul DuBois <paul@snake.net> - -The following list of guidelines contains items that I've been jotting -down over time as style questions have come up in relation to the -MySQL manual. I wouldn't say they're exactly "official", but they -do reflect current working practice. Arjen asked me to post this -on the list some time ago so that it can be discussed with a view -to adding it (or something like it) to the source tree. So here it is! - -Present in the mysql-4.0 source tree: Docs/ManualStyleGuidelines.wiki - - -The manual is written in UK English, not American English. This means: - - colour, not color - behaviour, not behavior - authorise, not authorize - optimise, not optimize - etc. - -Write MySQL, not @strong{MySQL} (the manual used to use the latter, but no -more). - -Write Unix, not UNIX. - -Use uppercase for SQL keywords, functions names, etc., when writing -SQL statement examples. - -To write a list of items, add commas after all items preceding the last one: - Correct: Features, products, and services - Incorrect: Features, products and services - -How to pluralize keywords that are enclosed in @code: - Correct: @code{SELECT}s - Incorrect: @code{SELECTs} or @code{SELECT}'s or @code{SELECT}:s - -Use "its" and "it's" correctly. These words are exceptions to -the normal use of "'s" to indicate possession: - -it's = it is (e.g., "one of the strengths of MySQL is that it's fast") -its = possession (e.g., "MySQL is fast, which is one of its strengths") - -"a lot" is two words. "alot" is rebarbative. - -Write lowercase, not lower case - -Write uppercase, not upper case - -Write lettercase, not letter case - -Write "web site" (two words), not "website", and "web page" rather -than "webpage". - -The word "data" is problematic. It's commonly used both in plural and in -singular form. The manual uses it as plural, which means you use "data are" -rather than "data is". It's unfortunate that no matter which form we use, it -will look incorrect to some people. But we can at least be internally -consistent. -(Paul: I think that the O'Reilly proofread might have caught one or two of these; could you please pick up on these but don't change them back straight away until the book is finished? Thanks; Arjen). - -Write "press Enter", not "hit Return" or "hit Enter". - -When reproducing program output, reproduce it exactly, even if it contains -typos. Don't "fix" it. (If the output is produced by a MySQL program, then -fix the source for the program to write the output correctly without the -typo, then update the manual to match.) - -Use "okay" rather than "ok" or "Ok" or "OK" in sentences. Exceptions: -* When describing instructions for a GUI with buttons that say "OK", then use "OK". That is, use the label that the GUI uses. -* When showing the output from a program, show the output exactly; don't change "ok" to "okay", etc. - -Write "Open Source" (inside @code{}), not "open source". - -To put something in quotes, do it ``like this,'' not "like this" -or 'like this.' In the latter two cases, the quotes will come -out looking rotten in printed formats. -Exception: quotes in code examples should be written using whatever -contention the program language requires. - -Table types should be written using @code{}; write @code{MyISAM}, not -MyISAM. - -When possible, use table names that are singular, not plural. -For example, use "item" rather than "items", or "person" rather than -"people". Sometimes you can add "_list" (as in "item_list") to make it -more clear that the name refers to a collection of items. - - Some commonly occurring misspelling: - - Correct Incorrect - --------------------------- - publicly publically - statically staticly - dynamically dynamicly - automatically automaticly - -There is no hyphen after "ly" words. Write statically linked, not -statically-linked. - -To refer to ASCII codes, use ASCII n, not ASCII(n), unless you're -referring to the ASCII() function, which case you use @code{ASCII()}. - - ASCII 13 indicates ASCII character code 13 - @code{ASCII(13)} indicates a function call - -backup is a noun or adjective (as in "a backup file"), back up is a verb -(as in "to back up a database") -rollback is a noun or adjective (as in "a rollback operation"), roll back -is a verb (as in "roll back a transaction") - -core dump is a noun or a verb (as in "a core dump file" or "a program -core dumps when it fails"). In the latter case, however, it's better say -say "a program dumps core when it fails"). - -Write character set names in @code{}, e.g., @code{latin1}, @code{win1251}. - -To prevent problems with various output formats, there should be no link -titles in a @uref{}. So @uref{url} is allowed, @uref{url,blabla} is not. - Use this format: - @uref{url} (WWW) - Not this format: - @uref{url, WWW} - Similarly for FTP sites. - -URLs ending in a domain name or directory should have a "/" at the end. -(For example, the URLs for all mirror sites should be written that way.) - -Privilege names are written using @strong and lowercase, as in "the -@strong{process} privilege". Column names in the grant tables are -written using @code and the lettercase found in the table definition, -as in "the @code{Process_priv} column". - -Write "e-mail", not "email". Exceptions are the @email{} construct, and -the Email attribute name in X509 certificate strings. - -Write thread-safe, transaction-safe, replication-safe, not thread safe, -transaction safe, replication safe. - -Write wildcard, not wild card or wild-card. - -Use "indexes", not "indices": Adding indexes to a table will improve the -performance of SELECT statements. -Exception: when returning to array elements, use "indices": The elements -of the array may be accessed using numeric indices, where the index -values ranges from 0 to n. - -Write "heavy-load production systems" (used as an adjective), -but "...used under heavy load" (used on its own). - -Write PostScript, not Postscript. - -When writing a list like "A, B, and C", include a comma before the last and. - -Write case-sensitive and case-insensitive (hyphenated). - -Write runtime, not run time. - -Write backward-compatible, not backward compatible or backwards compatible. - -Write application-related, not application related. - -Write filesystem, not file system. - -Write file-size, not file size. - -Write datafile, not data file. - -Write power-start, not power start. - -Write percent, not per cent. - -Write "toward", "and onward", not "towards", "onwards". - -Write third-party, not third party. - -Write turnkey, not turn-key. - -Write "the Net" (capitalised) if referring to the Internet in that way. - -Write long-awaited, not long awaited. - -Write natural-language, not natural language. - -Write low-volume <something> (when used as an adjective). - -Write platform-dependent, not platform dependent. - -Write something like "mentioned previously" instead of "above", and "later in this section" instead of "below" when making such relative references in your text. - -Write "... shown here", not "... shown below". - -Write "following some", not "something [shown] below". - -Write high-priority <something> (when used as an adjective), not high priority. - -Write "whether", not "whether or not". - -Write hand-held, not hand held. - -Write rewriting, not re-writing. - -Write re-issue(ing), not reissue(ing). - -Write command-line, not command line. - -Write server-side, not server side. - -Write "<blabla> only", not "only <blabla>". - -Write floating-point, not floating point. - -Write heavy-duty, not heavy duty. - -Write online, not on-line. - -Write user-defined, not user defined. - -Write multi-user, not multi user. - -Write multi-thread(ed), not multithread(ed). - -Write memory-based, not memory based. - -Write long-time <something> (when used as an adjective), not long time. - -Write 32-bit, not 32 bit or 32 bits. (Same goes for 64-bit, of course! ;-) - -Write "different from [what] ...", not "different than ...". - -Write "@-e.g., " instead of " e.g. " in the middle of a sentence. (The @- will be turned into a dash, or — for DocBook output.) -Following "e.g." by a comma, not a space or a colon. - -Write "@-" if you need to put a dash in a text, no surrounding spaces. - -Similar story for "for example" as for "e.g." - -Write CPU, not cpu (it's an acronym, not a word! ;-) - -Write "... uses ... CPU time", not "... uses ... CPU" (unless you're referring the processor itself.) - -If a (comment) is at the end of a sentence, start the comment with lowercase and put the . after the closing ), such as (like this). -If a comment is separate, start with uppercase and put the . inside the closing ). (Like this.) - -Write "something cannot do something", not "something can not something". - -Write "otherwise, ..." (with the comma) at the start of a sentence. - -Paul, could you please check "honoring"... is this proper British English? Thanks, Arjen. - -Write "byte-swapping", not "byte swapping". - -Write "Note:", not "NOTE:". And then continue with lowercase, it is not the start of a new sentence. - -Write "single-CPU" and "multiple-CPU", not "single CPU" and "multiple CPU". - -Paul, I think we should also decide whether to write Version or version, and in what situation. I am not changing much now because there's lots of funny instances and I don't want to risk getting it wrong. Thanks, Arjen. - -After a semicolon, don't use uppercase. It is NOT the start of a new sentence! - -It's "unstable", not "instable". ;-) - -It's "full-text", not "fulltext". - -Logical NOT/OR/AND are operators, not functions, so they take operands, not arguments. - -It's NetWare, not Netware (as per Novell's trademark guidelines). - -It's deprecated, not depricated. - diff --git a/Docs/manual.texi b/Docs/manual.texi index 0892203bca6..989a1836a15 100644 --- a/Docs/manual.texi +++ b/Docs/manual.texi @@ -1,30 +1,28 @@ \input texinfo @c -*-texinfo-*- -@c Copyright 1997-2002 TcX AB, Detron HB and MySQL Finland AB @c -@c This manual is NOT distributed under a GPL style license. -@c Use of the manual is subject to the following terms: -@c - Conversion to other formats is allowed, but the actual -@c content may not be altered or edited in any way. -@c - You may create a printed copy for your own personal use. -@c - For all other uses, such as selling printed copies or -@c using (parts of) the manual in another publication, -@c prior written agreement from MySQL AB is required. +@c ********************************************************* +@c +@c This is a dummy placeholder file for manual.texi in the +@c MySQL source trees. +@c +@c Note, that the manual has been moved into a separate +@c BitKeeper source tree named "mysqldoc" - do not attempt +@c to add NEWS entries or documentation to this file! All +@c changes to the manual should be done in the mysqldoc tree. +@c +@c See http://www.mysql.com/doc/en/Installing_source_tree.html +@c for information about how to work with BitKeeper source trees. +@c +@c This dummy file is being replaced with the real manual from the +@c mysqldoc tree when building the official source distribution. @c @c Please e-mail docs@mysql.com for more information or if @c you are interested in doing a translation. @c @c ********************************************************* -@c Note that @node names are used on our web site. -@c So do not change node names without checking -@c Makefile.am and SitePages first. -@c ********************************************************* @c @c %**start of header -@c there's a better way to do this... i just don't know it yet -@c sed will remove the "@c ifnusphere " to make this valid -@c ifnusphere @set nusphere 1 - @setfilename mysql.info @c We want the types in the same index @@ -46,24 +44,14 @@ @c yellow. From Steeve Buehler <ahr@YogElements.com> @set _extra_head <style> code {color:purple} tt {color:green} samp {color:navy} pre {color:maroon} </style> -@settitle MySQL Reference Manual for version @value{mysql_version}. +@settitle Dummy MySQL Reference Manual for version @value{mysql_version}. @c We want single-sided heading format, with chapters on new pages. To @c get double-sided format change 'on' below to 'odd' -@ifclear nusphere @setchapternewpage on -@end ifclear - -@ifset nusphere -@setchapternewpage odd -@end ifset @paragraphindent 0 -@ifset nusphere -@smallbook -@end ifset - @c %**end of header @ifinfo @@ -76,21 +64,14 @@ END-INFO-DIR-ENTRY @titlepage @sp 10 -@center @titlefont{MySQL Reference Manual} +@center @titlefont{Empty placeholder for the MySQL Reference Manual} @sp 10 -@center Copyright @copyright{} 1997-2002 MySQL AB +@center Copyright @copyright{} 1995-2002 MySQL AB @c blank page after title page makes page 1 be a page front. @c also makes the back of the title page blank. @page @end titlepage -@c Short contents, blank page, long contents. -@c until i can figure out the blank page, no short contents. -@c @shortcontents -@c @page -@c @page -@contents - @c This should be added. The HTML conversion also needs a MySQL version @c number somewhere. @@ -104,59774 +85,23 @@ END-INFO-DIR-ENTRY @end iftex - -@node Top, Introduction, (dir), (dir) +@node Top, (dir), (dir), (dir) @ifinfo -This is a manual for the @code{MySQL Database System}. -This version is about the @value{mysql_version} version of -@code{MySQL Server}. You can find a specific manual for any older -version of @code{MySQL Server} in the binary or source distribution -for that version. -@end ifinfo - -@menu -* Introduction:: General Information -* Installing:: Installing MySQL -* Tutorial:: MySQL Tutorial -* MySQL Database Administration:: Database Administration -* MySQL Optimisation:: MySQL Optimisation -* Reference:: MySQL Language Reference -* Table types:: MySQL Table Types -* Clients:: MySQL Client Tools and APIs -* Extending MySQL:: Extending MySQL -* Problems:: Problems -* Contrib:: Contributed Programs -* Credits:: Contributors to MySQL -* News:: MySQL Change History -* Porting:: Porting to Other Systems -* Environment variables:: MySQL environment variables -* Regexp:: MySQL Regular Expression Syntax -* GPL license:: GNU General Public License -* LGPL license:: GNU Lesser General Public License -* Function Index:: SQL Command, Type and Function Index -* Concept Index:: Concept Index -@end menu - - -@node Introduction, Installing, Top, Top -@chapter General Information - -@cindex overview -@cindex general information - -The @code{MySQL (TM)} software delivers a very fast, multi-threaded, -multi-user, and robust @code{SQL} (@code{Structured Query Language}) -database server. -@code{MySQL Server} is intended for mission-critical, heavy-load -production systems as well as for embedding into mass-deployed software. -@code{MySQL} is a trademark of @code{MySQL AB}. - -The @code{MySQL} software is @code{Dual Licensed}. Users can choose to -use the @code{MySQL} software as an @code{Open Source}/@code{Free Software} -product under the terms of the @code{GNU General Public License} -(@uref{http://www.gnu.org/licenses/}) or can purchase a standard -commercial license from @code{MySQL AB}. -@xref{Licensing and Support}. - -The @code{MySQL} web site (@uref{http://www.mysql.com/}) provides the -latest information about the @code{MySQL} software. - -The following list describes some sections of particular interest in this manual: - -@itemize @bullet -@item -For information about the company behind the @code{MySQL Database Server}, -see @ref{What is MySQL AB}. - -@item -For a discussion about the capabilities of the @code{MySQL Database Server}, -see @ref{Features}. - -@item -For installation instructions, see @ref{Installing}. - -@item -For tips on porting the @code{MySQL Database Software} to new architectures -or operating systems, see @ref{Porting}. - -@item -For information about upgrading from a Version 3.23 release, see -@ref{Upgrading-from-3.23}. - -@item -For information about upgrading from a Version 3.22 release, see -@ref{Upgrading-from-3.22}. - -@item -For a tutorial introduction to the @code{MySQL Database Server}, -see @ref{Tutorial}. - -@item -For examples of @code{SQL} and benchmarking information, see the -benchmarking directory (@file{sql-bench} in the distribution). - -@item -For a history of new features and bug fixes, see @ref{News}. - -@item -For a list of currently known bugs and misfeatures, see @ref{Bugs}. - -@item -For future plans, see @ref{TODO}. - -@item -For a list of all the contributors to this project, see @ref{Credits}. -@end itemize - -@strong{Important}: - -Reports of errors (often called bugs), as well as questions and comments, -should be sent to the mailing list at @email{mysql@@lists.mysql.com}. -@xref{Bug reports}. - -The @code{mysqlbug} script should be used to generate bug reports. -@c FIX! RPMs are also binary -For source distributions, the @code{mysqlbug} script can be found in the -@file{scripts} directory. For binary distributions, @code{mysqlbug} can -be found in the @file{bin} directory. If you have found a sensitive -security bug in @code{MySQL Server}, you should send an e-mail to -@email{security@@mysql.com}. - -@cindex errors, reporting -@cindex reporting, errors -@cindex mailing list address -@cindex @code{mysqlbug} script, location - - -@menu -* Manual-info:: About This Manual -* What-is:: What Is MySQL? -* What is MySQL AB:: What Is MySQL AB? -* Licensing and Support:: MySQL Support and Licensing -* MySQL 4.0 In A Nutshell:: MySQL 4.x In A Nutshell -* MySQL Information Sources:: MySQL Information Sources -* Compatibility:: How Standards-compatible Is MySQL? -* TODO:: MySQL and the future (The TODO) -* Comparisons:: How MySQL Compares to Other @code{Open Source} Databases -@end menu - - -@node Manual-info, What-is, Introduction, Introduction -@section About This Manual - -@cindex online location of manual -@cindex manual, online location - -This is the @code{MySQL} reference manual; it documents @code{MySQL} -Version @value{mysql_version}. Being a reference manual, it does not -provide general instruction on @code{SQL} or relational database -concepts. - -As the @code{MySQL Database Software} is under constant development, -the manual is also updated frequently. -The most recent version of this manual is available at -@uref{http://www.mysql.com/documentation/} in many different formats, -including Texinfo, plain text, Info, HTML, PostScript, PDF, -and Windows HLP versions. - -@cindex manual, available formats -@cindex Texinfo - -The primary document is the Texinfo file. -The HTML version is produced automatically using a modified version of -@code{texi2html}. -The plain text and Info versions are produced with @code{makeinfo}. -The PostScript version is produced using @code{texi2dvi} and @code{dvips}. -The PDF version is produced with @code{pdftex}. - -If you have a hard time finding information in the manual, you can try -our searchable version at @uref{http://www.mysql.com/doc/}. - -If you have any suggestions concerning additions or corrections to this -manual, please send them to the documentation team at @email{docs@@mysql.com}. - -This manual was initially written by David Axmark and Michael (Monty) -Widenius. It is currently maintained by Michael (Monty) Widenius, -Arjen Lentz, and Paul DuBois. For other contributors, see @ref{Credits}. - -The copyright (2002) to this manual is owned by the Swedish company -@code{MySQL AB}. @xref{Copyright}. - -@menu -* Manual conventions:: Conventions Used in This Manual -@end menu - -@node Manual conventions, , Manual-info, Manual-info -@subsection Conventions Used in This Manual - -@c We use British English. But let's not publicise that here yet ;-) - -This manual uses certain typographical conventions: - -@cindex manual, typographical conventions -@cindex typographical conventions -@cindex conventions, typographical - -@table @asis -@item @code{constant} -Constant-width font is used for command names and options; SQL statements; -database, table, and column names; C and Perl code; and environment variables. -Example: ``To see how @code{mysqladmin} works, invoke it with the -@code{--help} option.'' - -@item @file{filename} -Constant-width font with surrounding quotes is used for filenames and -pathnames. Example: ``The distribution is installed under the -@file{/usr/local/} directory.'' - -@item @samp{c} -Constant-width font with surrounding quotes is also used to indicate -character sequences. Example: ``To specify a wildcard, use the @samp{%} -character.'' - -@item @emph{italic} -Italic font is used for emphasis, @emph{like this}. - -@item @strong{boldface} -Boldface font is used in table headings and to convey -@strong{especially strong emphasis}. -@end table - -When commands are shown that are meant to be executed by a particular -program, the program is indicated by a prompt shown before the command. For -example, @code{shell>} indicates a command that you execute from your login -shell, and @code{mysql>} indicates a command that you execute from the -@code{mysql} client program: - -@example -shell> type a shell command here -mysql> type a mysql command here -@end example - -Shell commands are shown using Bourne shell syntax. If you are using a -@code{csh}-style shell, you may need to issue commands slightly differently. -For example, the sequence to set an environment variable and run a command -looks like this in Bourne shell syntax: - -@example -shell> VARNAME=value some_command -@end example - -@cindex shell syntax -@cindex command syntax - -For @code{csh}, you would execute the sequence like this: - -@example -shell> setenv VARNAME value -shell> some_command -@end example - -Often database, table, and column names must be substituted into commands. To -indicate that such substitution is necessary, this manual uses -@code{db_name}, @code{tbl_name} and @code{col_name}. For example, you might -see a statement like this: - -@example -mysql> SELECT col_name FROM db_name.tbl_name; -@end example - -This means that if you were to enter a similar statement, you would supply -your own database, table, and column names, perhaps like this: - -@example -mysql> SELECT author_name FROM biblio_db.author_list; -@end example - -SQL keywords are not case-sensitive and may be written in uppercase or -lowercase. This manual uses uppercase. - -In syntax descriptions, square brackets (@samp{[} and @samp{]}) are used -to indicate optional words or clauses. For example, in the following -statement, @code{IF EXISTS} is optional: - -@example -DROP TABLE [IF EXISTS] tbl_name -@end example - -When a syntax element consists of a number of alternatives, the alternatives -are separated by vertical bars (@samp{|}). When one member from a set of -choices @strong{may} be chosen, the alternatives are listed within square -brackets (@samp{[} and @samp{]}): - -@example -TRIM([[BOTH | LEADING | TRAILING] [remstr] FROM] str) -@end example - -When one member from a set of choices @strong{must} be chosen, the -alternatives are listed within braces (@samp{@{} and @samp{@}}): - -@example -@{DESCRIBE | DESC@} tbl_name @{col_name | wild@} -@end example - - -@node What-is, What is MySQL AB, Manual-info, Introduction -@section What Is MySQL? - -@cindex MySQL, defined -@cindex MySQL, introduction - -@code{MySQL}, the most popular @code{Open Source} SQL database, is -developed, distributed and supported by @code{MySQL AB}. @code{MySQL AB} is a -commercial company founded by the MySQL developers that builds its business -providing services around the @code{MySQL} database. -@xref{What is MySQL AB}. - -The @code{MySQL} web site (@uref{http://www.mysql.com/}) -provides the latest information about @code{MySQL} software and -@code{MySQL AB}. - -@table @asis - -@item @code{MySQL} is a database management system. - -A database is a structured collection of data. It may be anything from a -simple shopping list to a picture gallery or the vast amounts of -information in a corporate network. To add, access, and process data -stored in a computer database, you need a database management system -such as @code{MySQL} Server. Since computers are very good at handling large -amounts of data, database management plays a central role in computing, -as stand-alone utilities, or as parts of other applications. - -@cindex databases, defined - -@item MySQL is a relational database management system. - -A relational database stores data in separate tables rather than putting -all the data in one big storeroom. This adds speed and flexibility. -The tables are linked by defined relations making it possible to combine -data from several tables on request. The @code{SQL} part of -``@code{MySQL}'' stands for ``@code{Structured Query Language}''@-the -most common standardised language used to access databases. - -@cindex relational databases, defined -@cindex SQL, defined -@item MySQL software is @code{Open Source}. - -@code{Open Source} means that it is possible for anyone to use and modify. -Anybody can download the @code{MySQL} software from the Internet and use it -without paying anything. Anybody so inclined can study the source code -and change it to fit their needs. The @code{MySQL} software uses the -@code{GPL} (@code{GNU General Public License}), -@uref{http://www.gnu.org/licenses/}, to define what you -may and may not do with the software in different situations. -If you feel uncomfortable with the @code{GPL} or need to embed -@code{MySQL} code into a commercial application you can buy a -commercially licensed version from us. -@xref{MySQL licenses}. - -@cindex @code{Open Source}, defined -@cindex General Public License - -@item Why use the MySQL Database Server? - -The @code{MySQL Database Server} is very fast, reliable, and easy to use. -If that is what you are looking for, you should give it a try. -@code{MySQL Server} also has a practical set of features developed in -close cooperation with our users. You can find a performance comparison -of @code{MySQL Server} to some other database managers on our benchmark page. -@xref{MySQL Benchmarks}. - -@code{MySQL Server} was originally developed to handle large databases -much faster than existing solutions and has been successfully used in -highly demanding production environments for several years. Though -under constant development, @code{MySQL Server} today offers a rich and -useful set of functions. Its connectivity, speed, and security make -@code{MySQL Server} highly suited for accessing databases on the Internet. - -@item The technical features of MySQL Server - -For advanced technical information, see @ref{Reference}. -The @code{MySQL Database Software} is a client/server system that consists -of a multi-threaded @code{SQL} server that supports different backends, -several different client programs and libraries, administrative tools, -and a wide range of programming interfaces (@code{API}s). - -We also provide @code{MySQL Server} as a multi-threaded library which you -can link into your application to get a smaller, faster, easier-to-manage -product. - -@item There is a large amount of contributed MySQL software available. - -It is very likely that you will find that your favorite application or -language already supports the @code{MySQL Database Server}. - -@end table - -@cindex pronunciation, MySQL -@cindex MySQL, pronunciation -@cindex goals of MySQL -The official way to pronounce @code{MySQL} is ``My Ess Que Ell'' (not -``my sequel''), but we don't mind if you pronounce it as ``my sequel'' -or in some other localised way. - - -@menu -* History:: History of MySQL -* Features:: The Main Features of MySQL -* Stability:: How Stable Is MySQL? -* Table size:: How Big Can MySQL Tables Be? -* Year 2000 compliance:: Year 2000 Compliance -@end menu - -@node History, Features, What-is, What-is -@subsection History of MySQL - -@cindex MySQL history -@cindex history of MySQL -@cindex MySQL name -@cindex My, derivation - -We once started out with the intention of using @code{mSQL} to connect to our -tables using our own fast low-level (ISAM) routines. However, after some -testing we came to the conclusion that @code{mSQL} was not fast enough nor -flexible enough for our needs. This resulted in a new SQL interface to our -database but with almost the same API interface as @code{mSQL}. This API was -chosen to ease porting of third-party code. - -The derivation of the name @code{MySQL} is not perfectly clear. Our base -directory and a large number of our libraries and tools have had the prefix -``my'' for well over 10 years. However, Monty's daughter (some years younger) -is also named My. Which of the two gave its name to @code{MySQL} is -still a mystery, even for us. - - -@node Features, Stability, History, What-is -@subsection The Main Features of MySQL - -@cindex main features of MySQL -@cindex features of MySQL - -The following list describes some of the important characteristics -of the @code{MySQL Database Software}. @xref{MySQL 4.0 In A Nutshell}. - -@c This list is too technical and should be divided into one feature -@c list comparable to commercial competition and a very technical on -@c with max limits (from crash-me) and so on. -@table @asis -@item Internals and Portability -@itemize @bullet -@item -Written in C and C++. Tested with a broad range of different compilers. -@item -Works on many different platforms. @xref{Which OS}. -@item -Uses GNU Automake, Autoconf, and Libtool for portability. -@item -APIs for C, C++, Eiffel, Java, Perl, PHP, Python, Ruby, and Tcl. -@xref{Clients}. -@item -Fully multi-threaded using kernel threads. This means it can easily -use multiple CPUs if available. -@item -Very fast B-tree disk tables with index compression. -@item -A very fast thread-based memory allocation system. -@item -Very fast joins using an optimised one-sweep multi-join. -@item -In-memory hash tables which are used as temporary tables. -@item -SQL functions are implemented through a highly optimised class library and -should be as fast as possible! Usually there isn't any memory allocation -at all after query initialisation. -@item -The @code{MySQL} code gets tested with Purify -(a commercial memory leakage detector) as well as with Valgrind, -a GPL tool (@uref{http://developer.kde.org/~sewardj/}). -@end itemize - -@item Column Types -@itemize @bullet -@item -Many column types: signed/unsigned integers 1, 2, 3, 4, and 8 bytes -long, @code{FLOAT}, @code{DOUBLE}, @code{CHAR}, @code{VARCHAR}, -@code{TEXT}, @code{BLOB}, @code{DATE}, @code{TIME}, @code{DATETIME}, -@code{TIMESTAMP}, @code{YEAR}, @code{SET}, and @code{ENUM} types. -@xref{Column types}. -@item -Fixed-length and variable-length records. -@item -@cindex default values -All columns have default values. -You can use @code{INSERT} to insert a subset of a table's columns; those -columns that are not explicitly given values are set to their default -values. -@end itemize - -@item Commands and Functions -@itemize @bullet -@item -Full operator and function support in the @code{SELECT} and @code{WHERE} -parts of queries. For example: - -@example -mysql> SELECT CONCAT(first_name, " ", last_name) - -> FROM tbl_name - -> WHERE income/dependents > 10000 AND age > 30; -@end example - -@item -Full support for SQL @code{GROUP BY} and -@code{ORDER BY} clauses. Support -for group functions (@code{COUNT()}, -@code{COUNT(DISTINCT ...)}, -@code{AVG()}, @code{STD()}, -@code{SUM()}, @code{MAX()}, and @code{MIN()}). -@item -Support for @code{LEFT OUTER JOIN} and @code{RIGHT OUTER JOIN} with ANSI -SQL and ODBC syntax. -@item -Aliases on tables and columns are allowed as in the SQL92 standard. -@item -@code{DELETE}, @code{INSERT}, @code{REPLACE}, and @code{UPDATE} return -the number of rows that were changed (affected). It is possible to return -the number of rows matched instead by setting a flag when connecting to the -server. -@item -The @code{MySQL}-specific @code{SHOW} command can be used to retrieve -information about databases, tables, and indexes. The @code{EXPLAIN} command -can be used to determine how the optimiser resolves a query. -@item -Function names do not clash with table or column names. For example, -@code{ABS} is a valid column name. The only restriction is that for a -function call, no spaces are allowed between the function name and the -@samp{(} that follows it. @xref{Reserved words}. -@item -You can mix tables from different databases in the same query (as of -Version 3.22). -@end itemize - -@item Security -@itemize @bullet -@item -A privilege and password system that is very flexible and secure, and -allows host-based verification. Passwords are secure because all -password traffic is encrypted when you connect to a server. -@end itemize - -@item Scalability and Limits -@itemize @bullet -@item -Handles large databases. We are using @code{MySQL Server} with some -databases that contain 50 million records and we know of users that -use @code{MySQL Server} with 60,000 tables and about 5,000,000,000 rows. -@item -Up to 32 indexes per table are allowed. Each index may consist of 1 to 16 -columns or parts of columns. The maximum index width is 500 bytes -(this may be changed when compiling @code{MySQL Server}). -An index may use a prefix of a @code{CHAR} or @code{VARCHAR} field. -@end itemize - -@item Connectivity -@itemize @bullet -@item -Clients may connect to the @code{MySQL} server using TCP/IP Sockets, -Unix Sockets (Unix), or Named Pipes (NT). -@item -@code{ODBC} (Open-DataBase-Connectivity) support for Win32 (with source). -All ODBC 2.5 functions and many others. For example, you can use -MS Access to connect to your @code{MySQL} server. @xref{ODBC}. -@end itemize - -@item Localisation -@itemize @bullet -@item -The server can provide error messages to clients in many languages. -@xref{Languages}. -@item -Full support for several different character sets, including -ISO-8859-1 (Latin1), german, big5, ujis, and more. For example, -the Scandinavian characters 'å', 'ä' and 'ö' are allowed in table -and column names. -@item -All data is saved in the chosen character set. All comparisons for normal -string columns are case-insensitive. -@item -Sorting is done according to the chosen character set (the Swedish -way by default). It is possible to change this when the @code{MySQL} -server is started. To see an example of very advanced sorting, look -at the Czech sorting code. @code{MySQL Server} supports many different -character sets that can be specified at compile and runtime. -@end itemize - -@item Clients and Tools -@itemize @bullet -@item -Includes @code{myisamchk}, a very fast utility for table checking, -optimisation, and repair. All of the functionality of @code{myisamchk} -is also available through the SQL interface as well. -@xref{MySQL Database Administration}. -@item -All @code{MySQL} programs can be invoked with the @code{--help} or @code{-?} -options to obtain online assistance. -@end itemize - -@end table - - -@node Stability, Table size, Features, What-is -@subsection How Stable Is MySQL? - -@cindex stability - -This section addresses the questions ``@emph{How stable is MySQL Server?}'' -and ``@emph{Can I depend on MySQL Server in this project?}'' -We will try to clarify these issues and answer some important -questions that concern many potential users. The information in this -section is based on data gathered from the mailing list, which is -very active in identifying problems as well as reporting types of use. - -Original code stems back from the early '80s, providing a stable code -base, and the ISAM table format remains backward-compatible. -At TcX, the predecessor of @code{MySQL AB}, @code{MySQL} code has worked -in projects since mid-1996, without any problems. -When the @code{MySQL Database Software} was released to a wider public, -we noticed that there were -some pieces of ``untested code'' that were quickly found by the new -users who made different types of queries from us. Each new release -has had fewer portability problems (even though each new release has -had many new features). - -Each release of the @code{MySQL Server} has been usable. There have only -been problems -when users try code from the ``gray zones.'' Naturally, new users -don't know what the gray zones are; this section attempts to indicate -those that are currently known. -The descriptions mostly deal with Version 3.23 of @code{MySQL Server}. -All known and reported bugs are fixed in the latest version, with the -exception of those listed in the bugs section, which are things that -are design-related. @xref{Bugs}. - -The @code{MySQL Server} design is multi-layered with independent modules. -Some of the newer modules are listed here with an indication of how -well-tested each of them is: - -@cindex modules, list of - -@table @strong -@item Replication -- Gamma -Large server clusters using replication are in production use, with -good results. Work on enhanced replication features is continuing -in @code{MySQL} 4.x. - -@item @code{InnoDB} tables -- Stable (in 3.23 from 3.23.49) -The @code{InnoDB} transactional table handler has now been declared -stable in the @code{MySQL} 3.23 tree, starting from version 3.23.49. -@code{InnoDB} is being used in large, heavy-load production systems. - -@item @code{BDB} tables -- Gamma -The @code{Berkeley DB} code is very stable, but we are still improving -the @code{BDB} transactional table handler interface in -@code{MySQL Server}, so it will take some time before this is as well -tested as the other table types. - -@item @code{FULLTEXT} -- Beta -Full-text search works but is not yet widely used. -Important enhancements are being implemented for @code{MySQL} 4.0. - -@item @code{MyODBC 2.50} (uses ODBC SDK 2.5) -- Gamma -Increasingly in wide use. Some issues brought up appear to be -application-related and independent of the ODBC driver or underlying -database server. - -@item Automatic recovery of @code{MyISAM} tables -- Gamma -This status only regards the new code in the @code{MyISAM} table -handler that checks if the table was closed properly on open and -executes an automatic check/repair of the table if it wasn't. - -@item Bulk-insert -- Alpha -New feature in @code{MyISAM} tables in @code{MySQL} 4.0 for faster -insert of many rows. - -@item Locking -- Gamma -This is very system-dependent. On some systems there are big problems -using standard OS locking (@code{fcntl()}). In these cases, you should -run @code{mysqld} with the @code{--skip-external-locking} flag. -Problems are known to occur on some Linux systems, and on SunOS when -using NFS-mounted filesystems. - -@end table - -@code{MySQL AB} provides high-quality support for paying customers, -but the @code{MySQL} mailing list usually provides answers to common -questions. Bugs are usually fixed right away with a patch; for serious -bugs, there is almost always a new release. - - -@node Table size, Year 2000 compliance, Stability, What-is -@subsection How Big Can MySQL Tables Be? - -@cindex tables, maximum size -@cindex size of tables -@cindex operating systems, file-size limits -@cindex limits, file-size -@cindex files, size limits - -@code{MySQL} Version 3.22 has a 4G limit on table size. With the new -@code{MyISAM} table type in @code{MySQL} Version 3.23, the maximum table -size is pushed up to 8 million terabytes (2 ^ 63 bytes). - -Note, however, that operating systems have their own file-size -limits. Here are some examples: - -@multitable @columnfractions .30 .50 -@item @strong{Operating System} @tab @strong{File-Size Limit} -@item Linux-Intel 32 bit @tab 2G, 4G or more, depends on Linux version -@item Linux-Alpha @tab 8T (?) -@item Solaris 2.5.1 @tab 2G (possible 4G with patch) -@item Solaris 2.6 @tab 4G (can be changed with flag) -@item Solaris 2.7 Intel @tab 4G -@item Solaris 2.7 UltraSPARC @tab 512G -@end multitable - -On Linux 2.2 you can get bigger tables than 2G by using the LFS patch for -the ext2 filesystem. On Linux 2.4 patches also exist for ReiserFS -to get support for big files. - -This means that the table size for @code{MySQL} databases is normally -limited by the operating system. - -By default, @code{MySQL} tables have a maximum size of about 4G. You can -check the maximum table size for a table with the @code{SHOW TABLE STATUS} -command or with the @code{myisamchk -dv table_name}. -@xref{SHOW}. - -If you need bigger tables than 4G (and your operating system supports -this), you should set the @code{AVG_ROW_LENGTH} and @code{MAX_ROWS} -parameter when you create your table. @xref{CREATE TABLE}. You can -also set these later with @code{ALTER TABLE}. @xref{ALTER TABLE}. - -If your big table is going to be read-only, you could use -@code{myisampack} to merge and compress many tables to one. -@code{myisampack} usually compresses a table by at least 50%, so you can -have, in effect, much bigger tables. @xref{myisampack, , -@code{myisampack}}. - -You can go around the operating system file limit for @code{MyISAM} data -files by using the @code{RAID} option. @xref{CREATE TABLE}. - -Another solution can be the included @code{MERGE} library, which allows -you to handle a collection of identical tables as one. -@xref{MERGE, , @code{MERGE} tables}. - - -@node Year 2000 compliance, , Table size, What-is -@subsection Year 2000 Compliance - -@cindex Year 2000 compliance -@cindex compliance, Y2K -@cindex date functions, Y2K compliance - -The @code{MySQL Server} itself has no problems with Year 2000 (Y2K) -compliance: - -@itemize @bullet -@item -@code{MySQL Server} uses Unix time functions and has no problems with dates -until @code{2069}; all 2-digit years are regarded to be in the range -@code{1970} to @code{2069}, which means that if you store @code{01} in a -@code{year} column, @code{MySQL Server} treats it as @code{2001}. - -@item -All @code{MySQL} date functions are stored in one file, @file{sql/time.cc}, -and are coded very carefully to be year 2000-safe. - -@item -In @code{MySQL} Version 3.22 and later, the new @code{YEAR} column type -can store years @code{0} and @code{1901} to @code{2155} in 1 byte and -display them using 2 or 4 digits. -@end itemize - -You may run into problems with applications that use @code{MySQL Server} -in a way that is not Y2K-safe. For example, many old applications store -or manipulate years using 2-digit values (which are ambiguous) rather than -4-digit values. This problem may be compounded by applications that use -values such as @code{00} or @code{99} as ``missing'' value indicators. - -Unfortunately, these problems may be difficult to fix because different -applications may be written by different programmers, each of whom may -use a different set of conventions and date-handling functions. - -Here is a simple demonstration illustrating that @code{MySQL Server} -doesn't have any problems with dates until the year 2030: - -@example -mysql> DROP TABLE IF EXISTS y2k; -Query OK, 0 rows affected (0.01 sec) - -mysql> CREATE TABLE y2k (date DATE, - -> date_time DATETIME, - -> time_stamp TIMESTAMP); -Query OK, 0 rows affected (0.00 sec) - -mysql> INSERT INTO y2k VALUES - -> ("1998-12-31","1998-12-31 23:59:59",19981231235959), - -> ("1999-01-01","1999-01-01 00:00:00",19990101000000), - -> ("1999-09-09","1999-09-09 23:59:59",19990909235959), - -> ("2000-01-01","2000-01-01 00:00:00",20000101000000), - -> ("2000-02-28","2000-02-28 00:00:00",20000228000000), - -> ("2000-02-29","2000-02-29 00:00:00",20000229000000), - -> ("2000-03-01","2000-03-01 00:00:00",20000301000000), - -> ("2000-12-31","2000-12-31 23:59:59",20001231235959), - -> ("2001-01-01","2001-01-01 00:00:00",20010101000000), - -> ("2004-12-31","2004-12-31 23:59:59",20041231235959), - -> ("2005-01-01","2005-01-01 00:00:00",20050101000000), - -> ("2030-01-01","2030-01-01 00:00:00",20300101000000), - -> ("2050-01-01","2050-01-01 00:00:00",20500101000000); -Query OK, 13 rows affected (0.01 sec) -Records: 13 Duplicates: 0 Warnings: 0 - -mysql> SELECT * FROM y2k; -+------------+---------------------+----------------+ -| date | date_time | time_stamp | -+------------+---------------------+----------------+ -| 1998-12-31 | 1998-12-31 23:59:59 | 19981231235959 | -| 1999-01-01 | 1999-01-01 00:00:00 | 19990101000000 | -| 1999-09-09 | 1999-09-09 23:59:59 | 19990909235959 | -| 2000-01-01 | 2000-01-01 00:00:00 | 20000101000000 | -| 2000-02-28 | 2000-02-28 00:00:00 | 20000228000000 | -| 2000-02-29 | 2000-02-29 00:00:00 | 20000229000000 | -| 2000-03-01 | 2000-03-01 00:00:00 | 20000301000000 | -| 2000-12-31 | 2000-12-31 23:59:59 | 20001231235959 | -| 2001-01-01 | 2001-01-01 00:00:00 | 20010101000000 | -| 2004-12-31 | 2004-12-31 23:59:59 | 20041231235959 | -| 2005-01-01 | 2005-01-01 00:00:00 | 20050101000000 | -| 2030-01-01 | 2030-01-01 00:00:00 | 20300101000000 | -| 2050-01-01 | 2050-01-01 00:00:00 | 00000000000000 | -+------------+---------------------+----------------+ -13 rows in set (0.00 sec) - -@end example - -This shows that the @code{DATE} and @code{DATETIME} types will not -give any problems with future dates (they handle dates until the year -9999). - -The @code{TIMESTAMP} type, which is used to store the current time, has a -range up to only @code{2030-01-01}. @code{TIMESTAMP} has a range of -@code{1970} to @code{2030} on 32-bit machines (signed value). On 64-bit -machines it handles times up to @code{2106} (unsigned value). - -Even though @code{MySQL Server} is Y2K-compliant, it is your responsibility -to provide unambiguous input. See @ref{Y2K issues} for @code{MySQL Server}'s -rules for dealing with ambiguous date input data (data containing 2-digit -year values). - - - -@node What is MySQL AB, Licensing and Support, What-is, Introduction -@section What Is MySQL AB? - -@cindex MySQL AB, defined - -@code{MySQL AB} is the company of the @code{MySQL} founders and main -developers. @code{MySQL AB} was originally established in Sweden by -David Axmark, Allan Larsson, and Michael @code{Monty} Widenius. - -All the developers of the @code{MySQL} server are employed by the company. -We are a virtual organisation with people in a dozen countries around -the world. We communicate extensively over the Net every day with each -other and with our users, supporters and partners. - -We are dedicated to developing the @code{MySQL} software and spreading -our database to new users. @code{MySQL AB} owns the copyright to the -@code{MySQL} source code, the @code{MySQL} logo and trademark, and this -manual. @xref{What-is}. - -@menu -* MySQL AB business model and services:: The Business Model and Services of MySQL AB -* Contact information:: Contact Information -@end menu - -The @code{MySQL} core values show our dedication to @code{MySQL} and -@code{Open Source}. - -We want the @code{MySQL Database Software} to be: -@itemize @bullet -@item -The best and the most widely used database in the world. -@item -Available and affordable for all. -@item -Easy to use. -@item -Continuously improving while remaining fast and safe. -@item -Fun to use and improve. -@item -Free from bugs. -@end itemize - -@code{MySQL AB} and the people at @code{MySQL AB}: -@itemize @bullet -@item -Promote @code{Open Source} philosophy and support the -@code{Open Source} community. -@item -Aim to be good citizens. -@item -Prefer partners that share our values and mind-set. -@item -Answer e-mail and provide support. -@item -Are a virtual company, networking with others. -@item -Work against software patents. -@end itemize - -The @code{MySQL} web site (@uref{http://www.mysql.com/}) -provides the latest information about @code{MySQL} and @code{MySQL AB}. - - -@node MySQL AB business model and services, Contact information, What is MySQL AB, What is MySQL AB -@subsection The Business Model and Services of MySQL AB - -One of the most common questions we encounter is: -``@emph{How can you make a living from something you give away for free?}'' -This is how. - -@code{MySQL AB} makes money on support, services, commercial licenses, -and royalties, and we use these revenues to fund product development -and to expand the @code{MySQL} business. - -@menu -* Business Services Support:: Support -* Business Services Training:: Training and Certification -* Business Services Consulting:: Consulting -* Business Services Commercial licenses:: Commercial Licenses -* Business Services Partnering:: Partnering -* Business Services Advertising:: Advertising -@end menu - -The company has been profitable since its inception. In October 2001, -we accepted venture financing from leading Scandinavian investors and -a handful of business angels. This investment is used to solidify our -business model and build a basis for sustainable growth. - - -@node Business Services Support, Business Services Training, MySQL AB business model and services, MySQL AB business model and services -@subsubsection Support -@code{MySQL AB} is run and owned by the founders and main developers of -the @code{MySQL} database. The developers are committed to giving support -to customers and other users in order to stay in touch with their needs -and problems. All our support is given by qualified developers. Really -tricky questions are answered by Michael @code{Monty} Widenius, principal -author of the @code{MySQL Server}. -@xref{Support}. - -For more information and ordering support at various levels, see -@uref{http://www.mysql.com/support/} or contact our sales staff at -@email{sales@@mysql.com}. - - -@node Business Services Training, Business Services Consulting, Business Services Support, MySQL AB business model and services -@subsubsection Training and Certification -@cindex training -@cindex MySQL training -@cindex certification -@cindex MySQL certification -@code{MySQL AB} delivers @code{MySQL} and related training worldwide. -We offer both open courses and in-house courses tailored to the -specific needs of your company. @code{MySQL Training} is also available -through our partners, the @code{Authorised MySQL Training Centers}. - -Our training material uses the same example databases as our -documentation and our sample applications, and it is always updated -to reflect the latest @code{MySQL} version. Our trainers are backed by -the development team to guarantee the quality of the training and the -continuous development of the course material. This also ensures -that no questions raised during the courses remain unanswered. - -Attending our training courses will enable you to achieve your goals -related to your @code{MySQL} applications. You will also: -@itemize @bullet -@item -Save time. -@item -Improve the performance of your application(s). -@item -Reduce or eliminate the need for additional hardware, decreasing cost. -@item -Enhance security. -@item -Increase customers' and co-workers' satisfaction. -@item -Prepare yourself for @code{MySQL Certification}. -@end itemize - -If you are interested in our training as a potential participant or -as a training partner, please visit the training section at -@uref{http://www.mysql.com/training/} or contact us at: -@email{training@@mysql.com}. - -The @code{MySQL Certification Program} is being released in the second -half of 2002. For details please see -@uref{http://www.mysql.com/training/certification.html}. - - -@node Business Services Consulting, Business Services Commercial licenses, Business Services Training, MySQL AB business model and services -@subsubsection Consulting -@cindex consulting -@cindex MySQL consulting -@code{MySQL AB} and its @code{Authorised Partners} offer consulting -services to users of @code{MySQL Server} and to those who embed -@code{MySQL Server} in their own software, all over the world. - -Our consultants can help you design and tune your databases, construct -efficient queries, tune your platform for optimal performance, resolve -migration issues, set up replication, build robust transactional -applications, and more. -We also help customers embed @code{MySQL Server} in their products and -applications for large-scale deployment. - -Our consultants work in close collaboration with our development team, -which ensures the technical quality of our professional services. -Consulting assignments range from 2-day power-start sessions to -projects that span weeks and months. Our expertise not only covers -@code{MySQL Server}, but also extends into programming and scripting -languages such as PHP, Perl, and more. - -If you are interested in our consulting services or want to become a -consulting partner, please visit the consulting section of our web site -at @uref{http://www.mysql.com/consulting/} or contact our consulting -staff at @email{consulting@@mysql.com}. - - -@node Business Services Commercial licenses, Business Services Partnering, Business Services Consulting, MySQL AB business model and services -@subsubsection Commercial Licenses -The @code{MySQL} database is released under the -@code{GNU General Public License} (@code{GPL}). -This means that the @code{MySQL} software can be used free of charge -under the @code{GPL}. If you do not want to be bound by the @code{GPL} -terms (like the requirement that your own application becomes @code{GPL} -as well), you may purchase a commercial license for the same product -from @code{MySQL AB}. -See @uref{http://www.mysql.com/support/arrangements/price.html}. -Since @code{MySQL AB} owns the copyright to the @code{MySQL} source code, -we are able to employ @code{Dual Licensing} which means that the same -product is available under @code{GPL} and under a commercial -license. This does not in any way affect the @code{Open Source} -commitment of @code{MySQL AB}. For details about when a commercial -license is required, please see @ref{MySQL licenses}. - -We also sell commercial licenses of third-party @code{Open Source GPL} -software that adds value to @code{MySQL Server}. A good example is the -@code{InnoDB} transactional table handler that offers @code{ACID} -support, row-level locking, crash recovery, multi-versioning, foreign -key support, and more. @xref{InnoDB}. - - -@node Business Services Partnering, Business Services Advertising, Business Services Commercial licenses, MySQL AB business model and services -@subsubsection Partnering -@cindex partnering with MySQL AB -@code{MySQL AB} has a worldwide partner programme that covers training -courses, consulting & support, publications plus reselling and -distributing @code{MySQL} and related products. @code{MySQL AB Partners} -get visibility on the @uref{http://www.mysql.com/} web site and the right -to use special versions of the @code{MySQL} trademarks to identify their -products and promote their business. - -If you are interested in becoming a @code{MySQL AB Partner}, please e-mail -@email{partner@@mysql.com}. - -The word @code{MySQL} and the @code{MySQL} dolphin logo are trademarks of -@code{MySQL AB}. @xref{MySQL AB Logos and Trademarks}. -These trademarks represent a significant value that the @code{MySQL} -founders have built over the years. - - -@node Business Services Advertising, , Business Services Partnering, MySQL AB business model and services -@subsubsection Advertising -The @code{MySQL} web site (@uref{http://www.mysql.com/}) is popular among -developers and users. In October 2001, we served 10 million page views. -Our visitors represent a group that makes purchase decisions and -recommendations for both software and hardware. Twelve percent of our -visitors authorise purchase decisions, and only nine percent are not -involved in purchase decisions at all. More than 65% have made one or -more online business purchase within the last half-year, and 70% plan -to make one in the next months. - -If you are interested in placing banner ads on our web site, -@uref{http://www.mysql.com/}, please send an e-mail message to -@email{advertising@@mysql.com}. - - -@node Contact information, , MySQL AB business model and services, What is MySQL AB -@subsection Contact Information - -@cindex contact information -@cindex employment, contact information -@cindex licensing, contact information -@cindex advertising, contact information -@cindex employment with MySQL -@cindex jobs at MySQL - -The @code{MySQL} web site (@uref{http://www.mysql.com/}) -provides the latest information about @code{MySQL} and @code{MySQL AB}. - -For press service and inquiries not covered in our News releases -(@uref{http://www.mysql.com/news/}), please send e-mail to -@email{press@@mysql.com}. - -If you have a valid support contract with @code{MySQL AB}, you will -get timely, precise answers to your technical questions about the -@code{MySQL} software. For more information, see @ref{Support}. -On our website, see @uref{http://www.mysql.com/support/}, or send -an e-mail message to @email{sales@@mysql.com}. - -For information about @code{MySQL} training, please visit the training -section at @uref{http://www.mysql.com/training/}. If you have -restricted access to the Internet, please contact the @code{MySQL AB} -training staff at @email{training@@mysql.com}. -@xref{Business Services Training}. - -For information on the @code{MySQL Certification Program}, please see -@uref{http://www.mysql.com/training/certification.html}. -@xref{Business Services Training}. - -If you're interested in consulting, please visit the consulting -section at @uref{http://www.mysql.com/consulting/}. If you have -restricted access to the Internet, please contact the @code{MySQL AB} -consulting staff at @email{consulting@@mysql.com}. -@xref{Business Services Consulting}. - -Commercial licenses may be purchased online at -@uref{https://order.mysql.com/}. There you will also find information -on how to fax your purchase order to @code{MySQL AB}. More information -about licensing can be found at -@uref{http://www.mysql.com/support/arrangements/price.html}. -If you have -questions regarding licensing or you want a quote for a high-volume -license deal, please fill in the contact form on our web site -(@uref{http://www.mysql.com/}) or send an e-mail message -to @email{licensing@@mysql.com} (for licensing questions) or to -@email{sales@@mysql.com} (for sales inquiries). -@xref{MySQL licenses}. - -If you represent a business that is interested in partnering with -@code{MySQL AB}, please send e-mail to @email{partner@@mysql.com}. -@xref{Business Services Partnering}. - -If you are interested in placing a banner advertisement on the -@code{MySQL} web site (@uref{http://www.mysql.com/}), please send -e-mail to @email{advertising@@mysql.com}. -@xref{Business Services Advertising}. - -For more information on the @code{MySQL} trademark policy, refer to -@uref{http://www.mysql.com/company/trademark.html} or send e-mail to -@email{trademark@@mysql.com}. -@xref{MySQL AB Logos and Trademarks}. - -If you are interested in any of the @code{MySQL AB} jobs listed in our -jobs section (@uref{http://www.mysql.com/company/jobs/}), -please send an e-mail message to @email{jobs@@mysql.com}. -Please do not send your CV as an attachment, but rather as plain text -at the end of your e-mail message. - -For general discussion among our many users, please direct your -attention to the appropriate mailing list. -@xref{Questions}. - -Reports of errors (often called bugs), as well as questions and -comments, should be sent to the mailing list at -@email{mysql@@lists.mysql.com}. If you have found a sensitive -security bug in the @code{MySQL Server}, please send an e-mail -to @email{security@@mysql.com}. -@xref{Bug reports}. - -If you have benchmark results that we can publish, please -contact us at @email{benchmarks@@mysql.com}. - -If you have any suggestions concerning additions or corrections to this -manual, please send them to the manual team at @email{docs@@mysql.com}. - -For questions or comments about the workings or content of the -@code{MySQL} web site (@uref{http://www.mysql.com/}), -please send e-mail to @email{webmaster@@mysql.com}. - -Questions about the @code{MySQL Portals} -(@uref{http://www.mysql.com/portal/}) -may be sent to @email{portals@@mysql.com}. - -@code{MySQL AB} has a privacy policy, which can be read at -@uref{http://www.mysql.com/company/privacy.html}. -For any queries regarding this policy, please e-mail -@email{privacy@@mysql.com}. - -For all other inquires, please send e-mail to @email{info@@mysql.com}. - - -@node Licensing and Support, MySQL 4.0 In A Nutshell, What is MySQL AB, Introduction -@section MySQL Support and Licensing - -@cindex licensing terms -@cindex support terms - -This section describes @code{MySQL} support and licensing arrangements. - -@menu -* Support:: Support Offered by MySQL AB -* Copyright:: Copyrights and Licenses Used by MySQL -* MySQL licenses:: MySQL Licenses -* MySQL AB Logos and Trademarks:: MySQL AB Logos and Trademarks -@end menu - - -@node Support, Copyright, Licensing and Support, Licensing and Support -@subsection Support Offered by MySQL AB - -@cindex support, types -@cindex types of support -@cindex commercial support, types -@cindex costs, support -@cindex licensing costs -@cindex support costs -@cindex prices, support - -Technical support from @code{MySQL AB} means individualised answers -to your unique problems direct from the software engineers who code -the @code{MySQL} database engine. - -We try to take a broad and inclusive view of technical support. Almost -any problem involving @code{MySQL} software is important to us if it's -important to you. -Typically customers seek help on how to get different commands and -utilities to work, remove performance bottlenecks, restore crashed -systems, understand operating system or networking impacts on @code{MySQL}, -set up best practices for backup and recovery, utilise @code{API}s, etc. -Our support covers only the @code{MySQL} server and our own utilities, -not third-party products that access the @code{MySQL} server, though we -try to help with these where we can. - -Detailed information about our various support options is given at -@uref{http://www.mysql.com/support/}, where support contracts can also be -ordered online. If you have restricted access to the Internet, contact -our sales staff at @email{sales@@mysql.com}. - -Technical support is like life insurance. You can live happily -without it for years, but when your hour arrives it becomes -critically important, yet it's too late to buy it! -If you use @code{MySQL} Server for important applications and encounter -sudden troubles, it might take too long to figure out all the answers -yourself. You may need immediate access to the most experienced -@code{MySQL} troubleshooters available, those employed by @code{MySQL AB}. - - -@node Copyright, MySQL licenses, Support, Licensing and Support -@subsection Copyrights and Licenses Used by MySQL - -@cindex copyrights -@cindex licenses - -@code{MySQL AB} owns the copyright to the @code{MySQL} source code, -the @code{MySQL} logos and trademarks and this manual. -@xref{What is MySQL AB}. -Several different licenses are relevant to the @code{MySQL} -distribution: - -@enumerate -@item -All the @code{MySQL}-specific source in the server, the @code{mysqlclient} -library and the client, as well as the @code{GNU} @code{readline} library -is covered by the @code{GNU General Public License}. -@xref{GPL license}. -The text of this license can also be found as the file @file{COPYING} -in the distributions. - -@item -The @code{GNU} @code{getopt} library is covered by the -@code{GNU Lesser General Public License}. -@xref{LGPL license}. - -@item -Some parts of the source (the @code{regexp} library) are covered -by a Berkeley-style copyright. - -@item -Older versions of @code{MySQL} (3.22 and earlier) are subject to a -more strict license -(@uref{http://www.mysql.com/support/arrangements/mypl.html}). -See the documentation of the specific version for information. - -@item -The manual is currently @strong{not} distributed under a @code{GPL}-style license. -Use of the manual is subject to the following terms: -@itemize @bullet -@item -Conversion to other formats is allowed, but the actual content -may not be altered or edited in any way. -@item -You may create a printed copy for your own personal use. -@item -For all other uses, such as selling printed copies or using -(parts of) the manual in another publication, prior written -agreement from @code{MySQL AB} is required. -@end itemize -Please e-mail @email{docs@@mysql.com} for more information or -if you are interested in doing a translation. -@end enumerate - -For information about how the @code{MySQL} licenses work in practice, -please refer to @ref{MySQL licenses}. -Also see @ref{MySQL AB Logos and Trademarks}. - - -@node MySQL licenses, MySQL AB Logos and Trademarks, Copyright, Licensing and Support -@subsection MySQL Licenses - -@cindex licensing policy -@cindex technical support, licensing -@cindex support, licensing -@cindex General Public License, MySQL -@cindex GPL, MySQL -@cindex licensing, examples -@cindex selling products -@cindex products, selling - -The @code{MySQL} software is released under the -@code{GNU General Public License} (@code{GPL}), -which probably is the best known @code{Open Source} license. -The formal terms of the @code{GPL} license can be found at -@uref{http://www.gnu.org/licenses/}. -See also @uref{http://www.gnu.org/licenses/gpl-faq.html} and -@uref{http://www.gnu.org/philosophy/enforcing-gpl.html}. - -Since the @code{MySQL} software is released under the @code{GPL}, -it may often be used for free, but for certain uses you may want -or need to buy commercial licenses from @code{MySQL AB} at -@uref{https://order.mysql.com/}. -See @uref{http://www.mysql.com/support/arrangements.html} for -more information. - -Older versions of @code{MySQL} (3.22 and earlier) are subject to a -more strict license -(@uref{http://www.mysql.com/support/arrangements/mypl.html}). -See the documentation of the specific version for information. - -Please note that the use of the @code{MySQL} software under commercial -license, @code{GPL}, or the old @code{MySQL} license does not -automatically give you the right to use @code{MySQL AB} trademarks. -@xref{MySQL AB Logos and Trademarks}. - - -@menu -* Using the MySQL software under a commercial license:: Using the MySQL Software Under a Commercial License -* Using the MySQL software for free under GPL:: Using the MySQL Software for Free Under GPL -@end menu - -@node Using the MySQL software under a commercial license, Using the MySQL software for free under GPL, MySQL licenses, MySQL licenses -@subsubsection Using the MySQL Software Under a Commercial License - -The @code{GPL} license is contagious in the sense that when a program -is linked to a @code{GPL} program all the source code for all the parts -of the resulting product must also be released under the @code{GPL}. -Otherwise you break the license terms and forfeit your right to use the -@code{GPL} program altogether and also risk damages. - -You need a commercial license: - -@itemize @bullet -@item -When you link a program with any @code{GPL} code from the @code{MySQL} -software and don't want the resulting product to be @code{GPL}, maybe -because you want to build a commercial product or keep the added -non-@code{GPL} code closed source for other reasons. When purchasing -commercial licenses, you are not using the @code{MySQL} software under -@code{GPL} even though it's the same code. - -@item -When you distribute a non-@code{GPL} application that @strong{only} works with the -@code{MySQL} software and ship it with the @code{MySQL} software. This type -of solution is actually considered to be linking even if it's done over -a network. - -@item -When you distribute copies of the @code{MySQL} software without providing -the source code as required under the @code{GPL} license. - -@item -When you want to support the further development of the @code{MySQL} -database even if you don't formally need a commercial license. -Purchasing support directly from @code{MySQL AB} is another good way -of contributing to the development of the @code{MySQL} software, with -immediate advantages for you. -@xref{Support}. -@end itemize - -If you require a license, you will need one for each installation of the -@code{MySQL} software. This covers any number of CPUs on a machine, and there -is no artificial limit on the number of clients that connect to the server -in any way. - -For commercial licenses, please visit our website at -@uref{http://www.mysql.com/support/arrangements/price.html}. -For support contracts, see @uref{http://www.mysql.com/support/}. -If you have special needs or you have restricted access to the Internet, -please contact our sales staff at @email{sales@@mysql.com}. - - -@node Using the MySQL software for free under GPL, , Using the MySQL software under a commercial license, MySQL licenses -@subsubsection Using the MySQL Software for Free Under GPL - -@cindex licensing, free -@cindex free licensing - -You can use the @code{MySQL} software for free under the @code{GPL} if -you adhere to the conditions of the @code{GPL}. -For more complete coverage of the common questions about the @code{GPL} -see the generic FAQ from the Free Software Foundation at -@uref{http://www.gnu.org/licenses/gpl-faq.html}. -Some common cases: - -@itemize @bullet -@item -When you distribute both your own application as well as the @code{MySQL} -source code under the @code{GPL} with your product. - -@item -When you distribute the @code{MySQL} source code bundled with other -programs that are not linked to or dependent on the @code{MySQL} system -for their functionality even if you sell the distribution commercially. -This is called mere aggregation in the @code{GPL} license. - -@item -If you are not distributing @strong{any} part of the @code{MySQL} -system, you can use it for free. - -@item -@cindex ISP services -@cindex services, ISP -@cindex services, web -@cindex Internet Service Providers -When you are an Internet Service Provider (ISP), offering web hosting -with @code{MySQL} servers for your customers. -However, we do encourage people to use ISPs that have MySQL support, -as this will give them the confidence that if they have some problem -with the @code{MySQL} installation, their ISP will in fact have the -resources to solve the problem for them. -Note that even if an ISP does not have a commercial license for -@code{MySQL Server}, they should at least give their customers read -access to the source of the @code{MySQL} installation so that the -customers can verify that it is patched correctly. - -@item -@cindex web server, running -@cindex running a web server -When you use the @code{MySQL} Database Software in conjunction with a -web server, you do not need a commercial license (so long as it is not -a product you distribute). This is true even if you run a commercial -web server that uses @code{MySQL Server}, because you are not -distributing any part of the @code{MySQL} system. However, in this -case we would like you to purchase @code{MySQL} support because the -@code{MySQL} software is helping your enterprise. -@end itemize - -If your use of @code{MySQL} database software does not require a commercial -license, we encourage you to purchase support from @code{MySQL AB} anyway. -This way you contribute toward @code{MySQL} development and also gain -immediate advantages for yourself. @xref{Support}. - -If you use the @code{MySQL} database software in a commercial context -such that you profit by its use, we ask that you further the development -of the @code{MySQL} software by purchasing some level of support. We feel -that if the @code{MySQL} database helps your business, it is reasonable to -ask that you help @code{MySQL AB}. -(Otherwise, if you ask us support questions, you are not only using -for free something into which we've put a lot a work, you're asking -us to provide free support, too.) - - -@node MySQL AB Logos and Trademarks, , MySQL licenses, Licensing and Support -@subsection MySQL AB Logos and Trademarks - -@cindex logos -@cindex trademarks - -Many users of the @code{MySQL} database want to display the -@code{MySQL AB} dolphin logo on their web sites, books, or -boxed products. We welcome and encourage this, although it should be -noted that the word @code{MySQL} and the @code{MySQL} dolphin logo -are trademarks of @code{MySQL AB} and may only be used as stated in -our trademark policy at -@uref{http://www.mysql.com/company/trademark.html}. - -@menu -* The Original MySQL logo:: The Original MySQL Logo -* MySQL Logos that may be Used Without Written Permission:: MySQL Logos that may be Used Without Written Permission -* When need MySQL logo permission:: When do you need a Written Permission to use MySQL Logos? -* MySQL AB Partnership Logos:: MySQL AB Partnership Logos -* Using MySQL word in presentations:: Using the word @code{MySQL} in Printed Text or Presentations -* Using MySQL word in company and product names:: Using the word @code{MySQL} in Company and Product Names -@end menu - - -@node The Original MySQL logo, MySQL Logos that may be Used Without Written Permission, MySQL AB Logos and Trademarks, MySQL AB Logos and Trademarks -@subsubsection The Original MySQL Logo - -@c FIX: picture: MySQL logo - -The @code{MySQL} dolphin logo was designed by the Finnish advertising -agency Priority in 2001. The dolphin was chosen as a suitable symbol -for the @code{MySQL} database since it is a smart, fast, and lean animal, -effortlessly navigating oceans of data. We also happen to like dolphins. - -The original @code{MySQL} logo may only be used by representatives of -@code{MySQL AB} and by those having a written agreement allowing them -to do so. - - -@node MySQL Logos that may be Used Without Written Permission, When need MySQL logo permission, The Original MySQL logo, MySQL AB Logos and Trademarks -@subsubsection MySQL Logos that may be Used Without Written Permission - -@c FIX: pictures: powered by, works with, included - logos - -We have designed a set of special @emph{Conditional Use} logos that may be -downloaded from our web site at -@uref{http://www.mysql.com/press/logos.html} -and used on third-party web sites without written permission from -@code{MySQL AB}. -The use of these logos is not entirely unrestricted but, as the name -implies, subject to our trademark policy that is also available on our -web site. You should read through the trademark policy if you plan to -use them. The requirements are basically: - -@itemize @bullet -@item -Use the logo you need as displayed on the @uref{http://www.mysql.com/} -site. You may scale it to fit your needs, but not change colours or design, -or alter the graphics in any way. - -@item -Make it evident that you, and not @code{MySQL AB}, are the creator and -owner of the site that displays the @code{MySQL} trademark. - -@item -Don't use the trademark in a way that is detrimental to @code{MySQL AB} -or to the value of @code{MySQL AB} trademarks. We reserve the right to -revoke the right to use the @code{MySQL AB} trademark. - -@item -If you use the trademark on a web site, make it clickable, leading directly -to @uref{http://www.mysql.com/}. - -@item -If you are using the @code{MySQL} database under @code{GPL} in an -application, your application must be @code{Open Source} and -be able to connect to a @code{MySQL} server. -@end itemize - -Contact us at @email{trademark@@mysql.com} to inquire about special -arrangements to fit your needs. - -@node When need MySQL logo permission, MySQL AB Partnership Logos, MySQL Logos that may be Used Without Written Permission, MySQL AB Logos and Trademarks -@subsubsection When do you need a Written Permission to use MySQL Logos? - -In the following cases you need a written permission from @code{MySQL AB} -before using @code{MySQL} logos: - -@itemize @bullet -@item -When displaying any @code{MySQL AB} logo anywhere except on your web site. - -@item -When displaying any @code{MySQL AB} logo except the @emph{Conditional Use} -logos mentioned previously on web sites or elsewhere. -@end itemize - -Out of legal and commercial reasons we have to monitor the use of MySQL -trademarks on products, books, etc. We will usually require a fee for -displaying @code{MySQL AB} logos on commercial products, since we think -it is reasonable that some of the revenue is returned to fund further -development of the @code{MySQL} database. - - -@node MySQL AB Partnership Logos, Using MySQL word in presentations, When need MySQL logo permission, MySQL AB Logos and Trademarks -@subsubsection MySQL AB Partnership Logos - -@c FIX: pictures: partnership logos - Bertrand? - -@code{MySQL} partnership logos may only be used by companies and persons -having a written partnership agreement with @code{MySQL AB}. Partnerships -include certification as a @code{MySQL} trainer or consultant. -Please see @ref{Business Services Partnering,,Partnering}. - - -@node Using MySQL word in presentations, Using MySQL word in company and product names, MySQL AB Partnership Logos, MySQL AB Logos and Trademarks -@subsubsection Using the word @code{MySQL} in Printed Text or Presentations - -@code{MySQL AB} welcomes references to the @code{MySQL} database, but -note that the word @code{MySQL} is a trademark of @code{MySQL AB}. -Because of this, you should append the trademark symbol (@code{TM}) to -the first or most prominent use of the word @code{MySQL} in a text and -where appropriate, state that @code{MySQL} is a trademark of -@code{MySQL AB}. Please refer to our trademark policy at -@uref{http://www.mysql.com/company/trademark.html} for details. - - -@node Using MySQL word in company and product names, , Using MySQL word in presentations, MySQL AB Logos and Trademarks -@subsubsection Using the word @code{MySQL} in Company and Product Names - -Use of the word @code{MySQL} in product or company names or in Internet -domain names is not allowed without written permission from @code{MySQL AB}. - - -@node MySQL 4.0 In A Nutshell, MySQL Information Sources, Licensing and Support, Introduction -@section MySQL 4.x In A Nutshell - -Long promised by @code{MySQL AB} and long awaited by our users, -MySQL Server 4.0 is now available in beta version for download from -@uref{http://www.mysql.com/} and our mirrors. - -Main new features of MySQL Server 4.0 are geared toward our existing -business and community users, enhancing the MySQL database software -as the solution for mission-critical, heavy-load database systems. -Other new features target the users of embedded databases. - -@menu -* Nutshell Stepwise Rollout:: Stepwise Rollout -* Nutshell Ready for Immediate Development Use:: Ready for Immediate Development Use -* Nutshell Embedded MySQL:: Embedded MySQL -* Nutshell Other features:: Other Features Available From MySQL 4.0 -* Nutshell Future features:: Future MySQL 4.x Features -* Nutshell 4.1 development release:: MySQL 4.1, The Following Development Release -@end menu - - -@node Nutshell Stepwise Rollout, Nutshell Ready for Immediate Development Use, MySQL 4.0 In A Nutshell, MySQL 4.0 In A Nutshell -@subsection Stepwise Rollout - -The rollout of MySQL Server 4.x comes in several steps, with -the first version labelled 4.0.0-alpha already containing most of the -new features. Additional features have since been incorporated into -MySQL 4.0.1, 4.0.2, and onward; MySQL 4.0.3 has been labelled beta. -Further new features are being added in MySQL 4.1, targeted for -alpha release in third quarter 2002. - - -@node Nutshell Ready for Immediate Development Use, Nutshell Embedded MySQL, Nutshell Stepwise Rollout, MySQL 4.0 In A Nutshell -@subsection Ready for Immediate Development Use - -Users are not recommended to switch their production systems -to a MySQL Server 4.x until it is released in beta version -(such as 4.0.3 beta). -However, even the initial release has passed our extensive -test suite without any errors on any of the platforms we test on. -Due to the large number of new features, we thus recommend -MySQL Server 4.x even in alpha form for development use, with -the release schedule of MySQL Server 4.x being such that it will -reach stable state before the deployment of user applications -now under development. - - -@node Nutshell Embedded MySQL, Nutshell Other features, Nutshell Ready for Immediate Development Use, MySQL 4.0 In A Nutshell -@subsection Embedded MySQL - -@code{libmysqld} makes MySQL Server suitable for a vastly expanded realm of -applications. Using the embedded MySQL server library, one can -embed MySQL Server into various applications and electronics devices, where -the end user has no knowledge of there actually being an underlying -database. Embedded MySQL Server is ideal for use behind -the scenes in Internet appliances, public kiosks, turnkey -hardware/software combination units, high performance Internet -servers, self-contained databases distributed on CD-ROM, etc. - -Many users of @code{libmysqld} will benefit from the MySQL -@emph{Dual Licensing}. For those not wishing to be bound by the GPL, -the software is also made available under a commercial license. -The embedded MySQL library uses the same interface as the normal -client library, so it is convenient and easy to use. @xref{libmysqld}. - - -@node Nutshell Other features, Nutshell Future features, Nutshell Embedded MySQL, MySQL 4.0 In A Nutshell -@subsection Other Features Available From MySQL 4.0 - -@itemize @bullet -@item -Version 4.0 further increases @emph{the speed of MySQL Server} -in a number of areas, -such as bulk @code{INSERT}s, searching on packed indexes, creation of -@code{FULLTEXT} indexes, as well as @code{COUNT(DISTINCT)}. - -@item -The @code{InnoDB} table handler is now offered as a feature of the -standard MySQL server, including full support for @code{transactions} -and @code{row-level locking}. - -@item -Our German, Austrian, and Swiss users will note that we have a new character -set, @code{latin1_de}, which corrects the @emph{German sorting order}, -placing German umlauts in the same order as German telephone books. - -@item -Features to simplify migration from other database systems to MySQL -Server include @code{TRUNCATE TABLE} (like in Oracle) and @code{IDENTITY} as a -synonym for automatically incremented keys (like in Sybase). Many users will -also be happy to learn that MySQL Server now supports the @code{UNION} statement, -a long-awaited standard SQL feature. - -@item -In the process of building features for new users, we have not forgotten -requests by the community of loyal users. -We have multi-table @code{DELETE} statements. -By adding support for @code{symbolic linking} to @code{MyISAM} on the table -level (and not just the database level as before), as well as by enabling symlink -handling by default on Windows, we hope to show that we take enhancement -requests seriously. -Functions like @code{SQL_CALC_FOUND_ROWS} and @code{FOUND_ROWS()} make it -possible to know how many rows a query would have returned without a -@code{LIMIT} clause. -@end itemize - - -@node Nutshell Future features, Nutshell 4.1 development release, Nutshell Other features, MySQL 4.0 In A Nutshell -@subsection Future MySQL 4.x Features - -For the upcoming MySQL Server 4.x releases, -expect the following features now still under development: - -@itemize @bullet -@item -Mission-critical, heavy-load users of MySQL Server will appreciate -the additions to our replication system and our online hot backup. -Later versions of 4.x will include @code{fail-safe replication}; -already existing in 4.0, the @code{LOAD DATA FROM MASTER} command -will soon automate slave setup. The @code{online backup} will make -it easy to add a new replication slave without taking down -the master, and have a very low performance penalty on -update-heavy systems. - -@item -A convenience feature for Database Administrators is that -@code{mysqld} parameters (startup options) can soon be set without -taking down the servers. - -@item -The new @code{FULLTEXT} search properties of MySQL Server 4.0 enable the -use of @code{FULLTEXT} indexing of large text masses with both binary and -natural-language searching logic. Users can customise minimal word -length and define their own stop word lists in any human language, -enabling a new set of applications to be built on MySQL Server. - -@item -Many read-heavy applications will benefit from -further increased speed through the rewritten @code{key cache}. - -@item -Many developers will also be happy to see the @code{MySQL command help} -in the client. -@end itemize - - -@node Nutshell 4.1 development release, , Nutshell Future features, MySQL 4.0 In A Nutshell -@subsection MySQL 4.1, The Following Development Release - -MySQL Server 4.0 lays the foundation for the new features of -MySQL Server 4.1 and onward, -such as @code{nested subqueries}, @code{stored procedures}, and -@code{foreign key integrity rules}, which form the top of the -wish list for many of our customers. Along with those, we will -also include simpler additions, such as -multi-table @code{UPDATE} statements. - -After those additions, critics of the MySQL Database Server have -to be more imaginative -than ever in pointing out deficiencies in the MySQL Database -Management System. For long already known for its stability, -speed, and ease of use, MySQL Server will then match the requirement -checklist of very demanding buyers. - - -@node MySQL Information Sources, Compatibility, MySQL 4.0 In A Nutshell, Introduction -@section MySQL Information Sources - -@menu -* Portals:: MySQL Portals -* Questions:: MySQL Mailing Lists -@end menu - - -@node Portals, Questions, MySQL Information Sources, MySQL Information Sources -@subsection MySQL Portals - -@cindex MySQL Portals -@cindex manuals, about MySQL -@cindex books, about MySQL -@cindex MySQL Testimonials -@cindex users, of MySQL -@cindex news sites -@cindex search engines, web -@cindex web search engines -@cindex online magazines -@cindex magazines, online -@cindex web sites -@cindex services -@cindex PHP, web sites -@cindex consultants, list of -@cindex web pages, miscellaneous -@cindex @code{Contrib} directory -@cindex URLs to MySQL information -@cindex MySQL related information URLs - -The @code{MySQL Portals} (@uref{http://www.mysql.com/portal/}) -represent the ultimate resource to find @code{MySQL AB Partners}, -as well as books, or other @code{MySQL}-related solutions that you -may be looking for. Items are categorised and rated in order to -make it easy for you to locate information. - -By registering as a user, you will have the ability to comment on and -rate items presented in portals. You will also receive relevant -newsletters according to your user profile that you may update at -any time. - -Some of the current @code{MySQL Portal} categories include: - -@table @strong -@item Partners -Find @code{MySQL AB} partners worldwide. - -@item Books -Comment on, vote for, and buy books related to @code{MySQL}. - -@item Development -Various links to different sites that are using @code{MySQL Server} -for different purposes, with a description of each site. -This information can give you an idea of who uses the @code{MySQL} -database software and how @code{MySQL Server} can fulfill -requirements. - -Let us know about @emph{your} site or success story, too! -Visit @uref{http://www.mysql.com/feedback/testimonial.php}. - -@item Software -Find, buy, and download several applications and wrappers that make -use of the @code{MySQL} server. - -@item Distributions -From here you can find the various Linux distributions and other -software packages that contain the @code{MySQL} software. - -@item Service Providers -Companies providing @code{MySQL}-related services. -@end table - - -@node Questions, , Portals, MySQL Information Sources -@subsection MySQL Mailing Lists - -@cindex reporting, errors -@cindex errors, reporting -@cindex MySQL mailing lists - -@menu -* Mailing-list:: The MySQL Mailing Lists -* Asking questions:: Asking Questions or Reporting Bugs -* Bug reports:: How to Report Bugs or Problems -* Answering questions:: Guidelines for Answering Questions on the Mailing List -@end menu - -This section introduces you to the MySQL mailing lists, and gives -some guidelines as to how to use them. By subscribing to a mailing -list, you will receive as e-mail messages all other postings on the list, -and you will be able to send in your own questions and answers. - - -@node Mailing-list, Asking questions, Questions, Questions -@subsubsection The MySQL Mailing Lists - -@cindex mailing lists -@cindex e-mail lists - -To subscribe to the main MySQL mailing list, send a message to the -electronic mail address @email{mysql-subscribe@@lists.mysql.com}. - -To unsubscribe from the main MySQL mailing list, send a message to -the electronic mail address @email{mysql-unsubscribe@@lists.mysql.com}. - -Only the address to which you send your messages is significant. The -subject line and the body of the message are ignored. - -@c the last two addresses in this paragraph are not @email because they -@c shouldn't be live links. -If your reply address is not valid, you can specify your address -explicitly, by adding a hyphen to the subscribe or unsubscribe command -word, followed by your address with the @samp{@@} character in your -address replaced by a @samp{=}. For example, to subscribe -@code{your_name@@host.domain}, send a message to -@code{mysql-subscribe-your_name=host.domain@@lists.mysql.com}. - -Mail to @email{mysql-subscribe@@lists.mysql.com} or -@email{mysql-unsubscribe@@lists.mysql.com} is handled automatically by the -ezmlm mailing list processor. Information about ezmlm is available at -the ezmlm web site (@uref{http://www.ezmlm.org/}). - -To post a message to the list itself, send your message to -@code{mysql@@lists.mysql.com}. However, please @strong{do not} send mail about -subscribing or unsubscribing to @email{mysql@@lists.mysql.com} because any -mail sent to that address is distributed automatically to thousands of other -users. - -Your local site may have many subscribers to @email{mysql@@lists.mysql.com}. -If so, it may have a local mailing list, so messages sent from -@code{lists.mysql.com} to your site are propagated to the local list. In such -cases, please contact your system administrator to be added to or dropped -from the local MySQL list. - -If you wish to have traffic for a mailing list go to a separate mailbox in -your mail program, set up a filter based on the message headers. You can -use either the @code{List-ID:} or @code{Delivered-To:} headers to identify -list messages. - -The following MySQL mailing lists exist: - -@table @code -@item @email{announce-subscribe@@lists.mysql.com} announce -This is for announcement of new versions of MySQL and related -programs. This is a low-volume list all MySQL users should -subscribe to. - -@item @email{mysql-subscribe@@lists.mysql.com} mysql -The main list for general MySQL discussion. Please note that some -topics are better discussed on the more-specialised lists. If you post to the -wrong list, you may not get an answer! - -@item @email{mysql-digest-subscribe@@lists.mysql.com} mysql-digest -The @code{mysql} list in digest form. That means you get all individual -messages, sent as one large mail message once a day. - -@item @email{bugs-subscribe@@lists.mysql.com} bugs -On this list you should only post a full, repeatable bug report using -the @code{mysqlbug} script (if you are running on Windows, you should -include a description of the operating system and the MySQL version). -Preferably, you should test the problem using the latest stable or development -version of MySQL Server before posting! Anyone should be able to repeat the -bug by just using @code{mysql test < script} on the included test case. All -bugs posted on this list will be corrected or documented in the next -MySQL release! If only small code changes are needed, we -will also post a patch that fixes the problem. - -@item @email{bugs-digest-subscribe@@lists.mysql.com} bugs-digest -The @code{bugs} list in digest form. - -@item @email{internals-subscribe@@lists.mysql.com} internals -A list for people who work on the MySQL code. On this list one -can also discuss MySQL development and post patches. - -@item @email{internals-digest-subscribe@@lists.mysql.com} internals-digest -A digest version of the @code{internals} list. - -@item @email{java-subscribe@@lists.mysql.com} java -Discussion about the MySQL server and Java. Mostly about the JDBC drivers. - -@item @email{java-digest-subscribe@@lists.mysql.com} java-digest -A digest version of the @code{java} list. - -@item @email{win32-subscribe@@lists.mysql.com} win32 -All things concerning the MySQL software on Microsoft operating systems -such as Windows 9x/Me/NT/2000/XP. - -@item @email{win32-digest-subscribe@@lists.mysql.com} win32-digest -A digest version of the @code{win32} list. - -@item @email{myodbc-subscribe@@lists.mysql.com} myodbc -All things about connecting to the MySQL server with ODBC. - -@item @email{myodbc-digest-subscribe@@lists.mysql.com} myodbc-digest -A digest version of the @code{myodbc} list. - -@item @email{mycc-subscribe@@lists.mysql.com} mycc -All things about the MySQL @code{MyCC} graphical client. - -@item @email{mycc-digest-subscribe@@lists.mysql.com} mycc-digest -A digest version of the @code{mycc} list. - -@item @email{plusplus-subscribe@@lists.mysql.com} plusplus -All things concerning programming with the C++ API to MySQL. - -@item @email{plusplus-digest-subscribe@@lists.mysql.com} plusplus-digest -A digest version of the @code{plusplus} list. - -@item @email{msql-mysql-modules-subscribe@@lists.mysql.com} msql-mysql-modules -A list about the Perl support for MySQL with msql-mysql-modules. - -@item @email{msql-mysql-modules-digest-subscribe@@lists.mysql.com} msql-mysql-modules-digest -A digest version of the @code{msql-mysql-modules} list. -@end table - -You subscribe or unsubscribe to all lists in the same way as described -previously. In your subscribe or unsubscribe message, just put the appropriate -mailing list name rather than @code{mysql}. For example, to subscribe to or -unsubscribe from the @code{myodbc} list, send a message to -@email{myodbc-subscribe@@lists.mysql.com} or -@email{myodbc-unsubscribe@@lists.mysql.com}. - -If you can't get an answer for your questions from the mailing list, one -option is to pay for support from MySQL AB, which will put you -in direct contact with MySQL developers. @xref{Support}. - -The following table shows some MySQL mailing in languages other than -English. Note that these are not operated by MySQL AB, so we can't -guarantee the quality on these. - -@table @code -@item @email{mysql-france-subscribe@@yahoogroups.com} A French mailing list -@item @email{list@@tinc.net} A Korean mailing list -E-mail @code{subscribe mysql your@@e-mail.address} to this list. -@item @email{mysql-de-request@@lists.4t2.com} A German mailing list -E-mail @code{subscribe mysql-de your@@e-mail.address} to this list. -You can find information about this mailing list at -@uref{http://www.4t2.com/mysql/}. -@item @email{mysql-br-request@@listas.linkway.com.br} A Portugese mailing list -E-mail @code{subscribe mysql-br your@@e-mail.address} to this list. -@item @email{mysql-alta@@elistas.net} A Spanish mailing list -E-mail @code{subscribe mysql your@@e-mail.address} to this list. -@end table - - -@node Asking questions, Bug reports, Mailing-list, Questions -@subsubsection Asking Questions or Reporting Bugs - -@cindex net etiquette -@cindex mailing lists, archive location -@cindex searching, MySQL web pages - -Before posting a bug report or question, please do the following: - -@itemize @bullet -@item -Start by searching the MySQL online manual at: -@* -@uref{http://www.mysql.com/doc/} -@* -We try to keep the manual up to date by updating it frequently with -solutions to newly found problems! - -@item -Search the MySQL mailing list archives: -@* -@uref{http://lists.mysql.com/} -@* -@item -You can also use @uref{http://www.mysql.com/search.html} to search all the -web pages (including the manual) that are located at -@uref{http://www.mysql.com/}. -@end itemize - -If you can't find an answer in the manual or the archives, check with your -local MySQL expert. If you still can't find an answer to your -question, go ahead and read the next section about how to send mail to -@email{mysql@@lists.mysql.com}. - - -@node Bug reports, Answering questions, Asking questions, Questions -@subsubsection How to Report Bugs or Problems - -@cindex bugs, reporting -@cindex reporting, bugs -@cindex problems, reporting -@cindex errors, reporting -@cindex @code{mysqlbug} script -@cindex creating, bug reports -@cindex scripts, @code{mysqlbug} - -Writing a good bug report takes patience, but doing it right the first -time saves time for us and for you. A good bug report containing a full -test case for the bug will make it very likely that we will fix it in -the next release. This section will help you write your report correctly -so that you don't waste your time doing things that may not help us much -or at all. - -We encourage everyone to use the @code{mysqlbug} script to generate a bug -report (or a report about any problem), if possible. @code{mysqlbug} can be -found in the @file{scripts} directory in the source distribution, or for a -binary distribution, in the @file{bin} directory under your MySQL -installation directory. If you are unable to use @code{mysqlbug}, you should -still include all the necessary information listed in this section. - -The @code{mysqlbug} script helps you generate a report by determining much -of the following information automatically, but if something important is -missing, please include it with your message! Please read this section -carefully and make sure that all the information described here is included -in your report. - -@cindex bug reports, e-mail address -The normal place to report bugs and problems is -@email{mysql@@lists.mysql.com}. If you can make a test case that clearly -demonstrates the bug, you should post it to the @email{bugs@@lists.mysql.com} -list. Note that on this list you should only post a full, repeatable bug -report using the @code{mysqlbug} script. If you are running on Windows, -you should include a description of the operating system and the -MySQL version. Preferably, you should test the problem using -the latest stable or development version of MySQL Server before -posting! Anyone should be able to repeat the bug by just using -``@code{mysql test < script}'' on the included test case or run the -shell or Perl script that is included in the bug report. All bugs -posted on the @code{bugs} list will be corrected or documented in the next -MySQL release! If only small code changes are needed -to correct this problem, we will also post a patch that fixes the -problem. - -If you have found a sensitive security bug in MySQL, you should send an -e-mail to @email{security@@mysql.com}. - -Remember that it is possible to respond to a message containing too much -information, but not to one containing too little. Often people omit facts -because they think they know the cause of a problem and assume that some -details don't matter. A good principle is: if you are in doubt about stating -something, state it! It is a thousand times faster and less troublesome to -write a couple of lines more in your report than to be forced to ask again -and wait for the answer because you didn't include enough information the -first time. - -The most common errors are that people don't indicate the version number of -the MySQL distribution they are using, or don't indicate what -platform they have the MySQL server installed on (including the platform -version number). This is highly relevant information, and in 99 cases out of -100 the bug report is useless without it! Very often we get questions like, -``Why doesn't this work for me?'' Then we find that the feature -requested wasn't implemented in that MySQL version, or that a bug -described in a report has been fixed already in newer MySQL -versions. Sometimes the error is platform-dependent; in such cases, it is -next to impossible to fix anything without knowing the operating system and -the version number of the platform. - -Remember also to provide information about your compiler, if it is related to -the problem. Often people find bugs in compilers and think the problem is -MySQL-related. Most compilers are under development all the time and -become better version by version. To determine whether your -problem depends on your compiler, we need to know what compiler is used. -Note that every compiling problem should be regarded as a bug report and -reported accordingly. - -It is most helpful when a good description of the problem is included in the -bug report. That is, a good example of all the things you did that led to -the problem and the problem itself exactly described. The best reports are -those that include a full example showing how to reproduce the bug or -problem. @xref{Reproduceable test case}. - -If a program produces an error message, it is very important to include the -message in your report! If we try to search for something from the archives -using programs, it is better that the error message reported exactly matches -the one that the program produces. (Even the case should be observed!) -You should never try to remember what the error message was; instead, copy -and paste the entire message into your report! - -If you have a problem with MyODBC, you should try to generate a MyODBC -trace file. @xref{MyODBC bug report}. - -Please remember that many of the people who will read your report will -do so using an 80-column display. When generating reports or examples -using the @code{mysql} command-line tool, you should therefore use -the @code{--vertical} option (or the @code{\G} statement terminator) -for output that would exceed the available width for such a display -(for example, with the @code{EXPLAIN SELECT} statement; see the -example later in this section). - -@cindex bug reports, criteria for -Please include the following information in your report: - -@itemize @bullet -@item -The version number of the MySQL distribution you are using (for -example, MySQL Version 3.22.22). You can find out which version you -are running by executing @code{mysqladmin version}. @code{mysqladmin} can be -found in the @file{bin} directory under your MySQL installation -directory. - -@item -The manufacturer and model of the machine you are working on. - -@item -The operating system name and version. For most operating systems, you can -get this information by executing the Unix command @code{uname -a}. - -@item -Sometimes the amount of memory (real and virtual) is relevant. If in doubt, -include these values. - -@item -If you are using a source distribution of the MySQL software, the name and -version number of the compiler used is needed. If you have a binary -distribution, the distribution name is needed. - -@item -If the problem occurs during compilation, include the exact error -message(s) and also a few lines of context around the offending code in the -file where the error occurred. - -@item -If @code{mysqld} died, you should also report the query that crashed -@code{mysqld}. You can usually find this out by running @code{mysqld} with -logging enabled. @xref{Using log files}. - -@item -If any database table is related to the problem, include the output from -@code{mysqldump --no-data db_name tbl_name1 tbl_name2 ...}. This is very easy -to do and is a powerful way to get information about any table in a database -that will help us create a situation matching the one you have. - -@item -For speed-related bugs or problems with @code{SELECT} statements, you -should always include the output of @code{EXPLAIN SELECT ...}, and at -least the number of rows that the @code{SELECT} statement produces. You -should also include the output from @code{SHOW CREATE TABLE table_name} -for each involved table. The more information you give about your -situation, the more likely it is that someone can help you! For -example, the following is an example of a very good bug report (it -should of course be posted with the @code{mysqlbug} script): - -Example run using the @code{mysql} command-line tool (note the use of the -@code{\G} statement terminator for statements whose output width would -otherwise exceed that of an 80-column display device): - -@example -mysql> SHOW VARIABLES; -mysql> SHOW COLUMNS FROM ...\G - <output from SHOW COLUMNS> -mysql> EXPLAIN SELECT ...\G - <output from EXPLAIN> -mysql> FLUSH STATUS; -mysql> SELECT ...; - <A short version of the output from SELECT, - including the time taken to run the query> -mysql> SHOW STATUS; - <output from SHOW STATUS> -@end example - -@item -If a bug or problem occurs while running @code{mysqld}, try to provide an -input script that will reproduce the anomaly. This script should include any -necessary source files. The more closely the script can reproduce your -situation, the better. If you can make a reproduceable test case, you should -post this to @email{bugs@@lists.mysql.com} for a high-priority treatment! - -If you can't provide a script, you should at least include the output -from @code{mysqladmin variables extended-status processlist} in your mail to -provide some information of how your system is performing! - -@item -If you can't produce a test case in a few rows, or if the test table -is too big to be mailed to the mailing list (more than 10 rows), you should -dump your tables using @code{mysqldump} and create a @file{README} file -that describes your problem. - -Create a compressed archive of your files using -@code{tar} and @code{gzip} or @code{zip}, and use @code{ftp} to transfer the -archive to @uref{ftp://support.mysql.com/pub/mysql/secret/}. Then send a -short description of the problem to @email{bugs@@lists.mysql.com}. - -@item -If you think that the MySQL server produces a strange result from a query, -include not only the result, but also your opinion of what the result -should be, and an account describing the basis for your opinion. - -@item -When giving an example of the problem, it's better to use the variable names, -table names, etc., that exist in your actual situation than to come up with -new names. The problem could be related to the name of a variable or table! -These cases are rare, perhaps, but it is better to be safe than sorry. -After all, it should be easier for you to provide an example that uses your -actual situation, and it is by all means better for us. In case you have data -you don't want to show to others, you can use @code{ftp} to transfer it to -@uref{ftp://support.mysql.com/pub/mysql/secret/}. If the data is really top -secret and you don't want to show it even to us, then go ahead and provide -an example using other names, but please regard this as the last choice. - -@item -Include all the options given to the relevant programs, if possible. For -example, indicate the options that you use when you start the @code{mysqld} -daemon and that you use to run any MySQL client programs. The -options to programs like @code{mysqld} and @code{mysql}, and to the -@code{configure} script, are often keys to answers and are very relevant! -It is never a bad idea to include them anyway! If you use any modules, such -as Perl or PHP, please include the version number(s) of those as well. - -@item -If your question is related to the privilege system, please include the -output of @code{mysqlaccess}, the output of @code{mysqladmin reload}, and all -the error messages you get when trying to connect! When you test your -privileges, you should first run @code{mysqlaccess}. After this, execute -@code{mysqladmin reload version} and try to connect with the program that -gives you trouble. @code{mysqlaccess} can be found in the @file{bin} -directory under your MySQL installation directory. - -@item -If you have a patch for a bug, that is good. But don't assume the patch is -all we need, or that we will use it, if you don't provide some necessary -information such as test cases showing the bug that your patch fixes. We -might find problems with your patch or we might not understand it at all; if -so, we can't use it. - -If we can't verify exactly what the patch is meant for, we won't use it. -Test cases will help us here. Show that the patch will handle all the -situations that may occur. If we find a borderline case (even a rare one) -where the patch won't work, it may be useless. - -@item -Guesses about what the bug is, why it occurs, or what it depends on -are usually wrong. Even the MySQL team can't guess such things -without first using a debugger to determine the real cause of a bug. - -@item -Indicate in your mail message that you have checked the reference manual -and mail archive so that others know you have tried to solve the -problem yourself. - -@item -If you get a @code{parse error}, please check your syntax closely! If -you can't find something wrong with it, it's extremely likely that your -current version of MySQL Server doesn't support the query you are -using. If you are using the current version and the manual at -@uref{http://www.mysql.com/doc/} doesn't cover the -syntax you are using, MySQL Server doesn't support your query. In this -case, your only options are to implement the syntax yourself or e-mail -@email{licensing@@mysql.com} and ask for an offer to implement it! - -If the manual covers the syntax you are using, but you have an older version -of MySQL Server, you should check the MySQL change history to see -when the syntax was implemented. In this case, you have the option of -upgrading to a newer version of MySQL Server. @xref{News}. - -@item -If you have a problem such that your data appears corrupt or you get -errors when you access some particular table, you should first check and then -try repairing your tables with @code{myisamchk} or @code{CHECK TABLE} and -@code{REPAIR TABLE}. @xref{MySQL Database Administration}. - -@item -If you often get corrupted tables you should try to find out when and why this -happens. In this case, the @file{mysql-data-directory/'hostname'.err} file -may contain some information about what happened. @xref{Error log}. Please -include any relevant information from this file in your bug report. Normally -@code{mysqld} should @strong{never} crash a table if nothing killed it in the -middle of an update! If you can find the cause of @code{mysqld} dying, -it's much easier for us to provide you with a fix for the problem. -@xref{What is crashing}. - -@item -If possible, download and install the most recent version of MySQL Server -and check whether it solves your problem. All versions of -the MySQL software are thoroughly tested and should work without problems. -We believe in making everything as backward-compatible as possible, -and you should be able to switch MySQL versions without any hassle. -@xref{Which version}. -@end itemize - -@cindex technical support, mailing address -@cindex support, mailing address -@cindex customer support, mailing address -@cindex mailing address, for customer support -If you are a support customer, please cross-post the bug report to -@email{mysql-support@@mysql.com} for higher-priority treatment, as well as to -the appropriate mailing list to see if someone else has experienced (and -perhaps solved) the problem. - -For information on reporting bugs in @code{MyODBC}, see @ref{ODBC Problems}. - -For solutions to some common problems, see @ref{Problems}. - -When answers are sent to you individually and not to the mailing list, -it is considered good etiquette to summarise the answers and send the -summary to the mailing list so that others may have the benefit of -responses you received that helped you solve your problem! - - -@node Answering questions, , Bug reports, Questions -@subsubsection Guidelines for Answering Questions on the Mailing List - -@cindex net etiquette -@cindex questions, answering -@cindex answering questions, etiquette -@cindex mailing lists, guidelines - -If you consider your answer to have broad interest, you may want to post it -to the mailing list instead of replying directly to the individual who -asked. Try to make your answer general enough that people other than the -original poster may benefit from it. When you post to the list, please make -sure that your answer is not a duplication of a previous answer. - -Try to summarise the essential part of the question in your reply; don't feel -obliged to quote the entire original message. - -Please don't post mail messages from your browser with HTML mode turned on! -Many users don't read mail with a browser! - - -@node Compatibility, TODO, MySQL Information Sources, Introduction -@section How Standards-compatible Is MySQL? - -@cindex compatibility, with ANSI SQL -@cindex standards compatibility -@cindex extensions, to ANSI SQL -@cindex ANSI SQL92, extensions to - -This section describes how MySQL relates to the ANSI SQL standards. -MySQL Server has many extensions to the ANSI SQL standards, and here you -will find out what they are and how to use them. You will also find -information about functionality missing from MySQL Server, and how to work -around some differences. - -Our goal is to not, without a very good reason, restrict MySQL Server usability -for any usage. Even if we don't have the resources to do development -for every possible use, we are always willing to help and offer -suggestions to people who are trying to use MySQL Server in new territories. - -One of our main goals with the product is to continue to work toward -ANSI 99 compliancy, but without sacrificing speed or reliability. -We are not afraid to add extensions to SQL or support for non-SQL -features if this greatly increases the usability of MySQL Server for a big -part of our users. (The new @code{HANDLER} interface in MySQL Server 4.0 -is an example of this strategy. @xref{HANDLER, , @code{HANDLER}}.) - -We will continue to support transactional and non-transactional -databases to satisfy both heavy web/logging usage and mission-critical -24/7 usage. - -MySQL Server was designed from the start to work with medium size databases -(10-100 million rows, or about 100 MB per table) on small computer -systems. We will continue to extend MySQL Server to work even better -with terabyte-size databases, as well as to make it possible -to compile a reduced MySQL version that is more suitable for hand-held -devices and embedded usage. The compact design of the MySQL server makes both -of these directions possible without any conflicts in the source tree. - -We are currently not targeting realtime support or clustered databases -(even if you can already do a lot of things with our replication -services). - -We don't believe that one should have native XML support in the -database, but will instead add the XML support our users request from -us on the client side. We think it's better to keep the main server -code as ``lean and clean'' as possible and instead develop libraries to -deal with the complexity on the client side. This is part of the strategy -mentioned previously of not sacrificing speed or reliability in the -server. - -@menu -* Standards:: What Standards Does MySQL Follow? -* ANSI mode:: Running MySQL in ANSI Mode -* Extensions to ANSI:: MySQL Extensions to ANSI SQL92 -* Differences from ANSI:: MySQL Differences Compared to ANSI SQL92 -* Bugs:: Known Errors and Design Deficiencies in MySQL -@end menu - - -@node Standards, ANSI mode, Compatibility, Compatibility -@subsection What Standards Does MySQL Follow? - -Entry-level SQL92. ODBC levels 0-3.51. - -We are aiming toward supporting the full ANSI SQL99 standard, -but without concessions to speed and quality of the code. - - -@node ANSI mode, Extensions to ANSI, Standards, Compatibility -@subsection Running MySQL in ANSI Mode - -@cindex running, ANSI mode -@cindex ANSI mode, running - -If you start @code{mysqld} with the @code{--ansi} option, the following -behaviour of MySQL Server changes: - -@itemize @bullet -@item -@code{||} is string concatenation instead of @code{OR}. - -@item -You can have any number of spaces between a function name and the @samp{(}. -This forces all function names to be treated as reserved words. - -@item -@samp{"} will be an identifier quote character (like the MySQL Server -@samp{`} quote character) and not a string quote character. - -@item -@code{REAL} will be a synonym for @code{FLOAT} instead of a synonym for -@code{DOUBLE}. - -@item -The default transaction isolation level is @code{SERIALIZABLE}. -@xref{SET TRANSACTION}. -@end itemize - -This is the same as using -@code{--sql-mode=REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES, -IGNORE_SPACE,SERIALIZE,ONLY_FULL_GROUP_BY}. - - -@node Extensions to ANSI, Differences from ANSI, ANSI mode, Compatibility -@subsection MySQL Extensions to ANSI SQL92 - -@cindex hints -MySQL Server includes some extensions that you probably will not find in -other SQL databases. Be warned that if you use them, your code will not be -portable to other SQL servers. In some cases, you can write code that -includes MySQL extensions, but is still portable, by using comments -of the form @code{/*! ... */}. In this case, MySQL Server will parse and -execute the code within the comment as it would any other MySQL -statement, but other SQL servers will ignore the extensions. For example: - -@example -SELECT /*! STRAIGHT_JOIN */ col_name FROM table1,table2 WHERE ... -@end example - -If you add a version number after the @code{'!'}, the syntax will be -executed only if the MySQL version is equal to or newer than the used -version number: - -@example -CREATE /*!32302 TEMPORARY */ TABLE t (a int); -@end example - -This means that if you have Version 3.23.02 or newer, MySQL -Server will use the @code{TEMPORARY} keyword. - -The following is a list of MySQL extensions: - -@itemize @bullet -@item -The field types @code{MEDIUMINT}, @code{SET}, @code{ENUM}, and the -different @code{BLOB} and @code{TEXT} types. - -@item -The field attributes @code{AUTO_INCREMENT}, @code{BINARY}, @code{NULL}, -@code{UNSIGNED}, and @code{ZEROFILL}. - -@item -All string comparisons are case-insensitive by default, with sort -ordering determined by the current character set (ISO-8859-1 Latin1 by -default). If you don't like this, you should declare your columns with -the @code{BINARY} attribute or use the @code{BINARY} cast, which causes -comparisons to be done according to the ASCII order used on the -MySQL server host. - -@item -MySQL Server maps each database to a directory under the MySQL -data directory, and tables within a database to filenames in the database -directory. - -This has a few implications: - -@cindex database names, case-sensitivity -@cindex table names, case-sensitivity -@cindex case-sensitivity, of database names -@cindex case-sensitivity, of table names - -@itemize @minus - -@item -Database names and table names are case-sensitive in MySQL Server on -operating systems that have case-sensitive filenames (like most Unix -systems). @xref{Name case sensitivity}. - -@item -Database, table, index, column, or alias names may begin with a digit -(but may not consist solely of digits). - -@item -You can use standard system commands to back up, rename, move, delete, and copy -tables. For example, to rename a table, rename the @file{.MYD}, @file{.MYI}, -and @file{.frm} files to which the table corresponds. -@end itemize - -@item -In SQL statements, you can access tables from different databases -with the @code{db_name.tbl_name} syntax. Some SQL servers provide -the same functionality but call this @code{User space}. -MySQL Server doesn't support tablespaces as in: -@code{create table ralph.my_table...IN my_tablespace}. - -@item -@code{LIKE} is allowed on numeric columns. - -@item -Use of @code{INTO OUTFILE} and @code{STRAIGHT_JOIN} in a @code{SELECT} -statement. @xref{SELECT, , @code{SELECT}}. - -@item -The @code{SQL_SMALL_RESULT} option in a @code{SELECT} statement. - -@item -@code{EXPLAIN SELECT} to get a description on how tables are joined. - -@item -Use of index names, indexes on a prefix of a field, and use of -@code{INDEX} or @code{KEY} in a @code{CREATE TABLE} -statement. @xref{CREATE TABLE, , @code{CREATE TABLE}}. - -@item -Use of @code{TEMPORARY} or @code{IF NOT EXISTS} with @code{CREATE TABLE}. - -@item -Use of @code{COUNT(DISTINCT list)} where @code{list} is more than one element. - -@item -Use of @code{CHANGE col_name}, @code{DROP col_name}, or @code{DROP -INDEX}, @code{IGNORE} or @code{RENAME} in an @code{ALTER TABLE} -statement. @xref{ALTER TABLE, , @code{ALTER TABLE}}. - -@item -Use of @code{RENAME TABLE}. @xref{RENAME TABLE, , @code{RENAME TABLE}}. - -@item -Use of multiple @code{ADD}, @code{ALTER}, @code{DROP}, or @code{CHANGE} -clauses in an @code{ALTER TABLE} statement. - -@item -Use of @code{DROP TABLE} with the keywords @code{IF EXISTS}. - -@item -You can drop multiple tables with a single @code{DROP TABLE} statement. - -@item -The @code{LIMIT} clause of the @code{DELETE} statement. - -@item -The @code{DELAYED} clause of the @code{INSERT} and @code{REPLACE} -statements. - -@item -The @code{LOW_PRIORITY} clause of the @code{INSERT}, @code{REPLACE}, -@code{DELETE}, and @code{UPDATE} statements. - -@cindex Oracle compatibility -@cindex compatibility, with Oracle -@item -Use of @code{LOAD DATA INFILE}. In many cases, this syntax is compatible with -Oracle's @code{LOAD DATA INFILE}. @xref{LOAD DATA, , @code{LOAD DATA}}. - -@item -The @code{ANALYZE TABLE}, @code{CHECK TABLE}, @code{OPTIMIZE TABLE}, and -@code{REPAIR TABLE} statements. - -@item -The @code{SHOW} statement. -@xref{SHOW, , @code{SHOW}}. - -@item -Strings may be enclosed by either @samp{"} or @samp{'}, not just by @samp{'}. - -@item -Use of the escape @samp{\} character. - -@item -The @code{SET} statement. @xref{SET OPTION, , @code{SET}}. - -@item -You don't need to name all selected columns in the @code{GROUP BY} part. -This gives better performance for some very specific, but quite normal -queries. -@xref{Group by functions}. - -@item -One can specify @code{ASC} and @code{DESC} with @code{GROUP BY}. - -@item -To make it easier for users who come from other SQL environments, -MySQL Server supports aliases for many functions. For example, all -string functions support both ANSI SQL syntax and ODBC syntax. - -@item -MySQL Server understands the @code{||} and @code{&&} operators to mean -logical OR and AND, as in the C programming language. In MySQL Server, -@code{||} and @code{OR} are synonyms, as are @code{&&} and @code{AND}. -Because of this nice syntax, MySQL Server doesn't support -the ANSI SQL @code{||} operator for string concatenation; use -@code{CONCAT()} instead. Because @code{CONCAT()} takes any number -of arguments, it's easy to convert use of the @code{||} operator to -MySQL Server. - -@item -@code{CREATE DATABASE} or @code{DROP DATABASE}. -@xref{CREATE DATABASE, , @code{CREATE DATABASE}}. - -@cindex PostgreSQL compatibility -@cindex compatibility, with PostgreSQL -@item -The @code{%} operator is a synonym for @code{MOD()}. That is, -@code{N % M} is equivalent to @code{MOD(N,M)}. @code{%} is supported -for C programmers and for compatibility with PostgreSQL. - -@item -The @code{=}, @code{<>}, @code{<=} ,@code{<}, @code{>=},@code{>}, -@code{<<}, @code{>>}, @code{<=>}, @code{AND}, @code{OR}, or @code{LIKE} -operators may be used in column comparisons to the left of the -@code{FROM} in @code{SELECT} statements. For example: - -@example -mysql> SELECT col1=1 AND col2=2 FROM tbl_name; -@end example - -@item -The @code{LAST_INSERT_ID()} function. -@xref{mysql_insert_id, , @code{mysql_insert_id()}}. - -@item -The @code{REGEXP} and @code{NOT REGEXP} extended regular expression -operators. - -@item -@code{CONCAT()} or @code{CHAR()} with one argument or more than two -arguments. (In MySQL Server, these functions can take any number of -arguments.) - -@item The @code{BIT_COUNT()}, @code{CASE}, @code{ELT()}, -@code{FROM_DAYS()}, @code{FORMAT()}, @code{IF()}, @code{PASSWORD()}, -@code{ENCRYPT()}, @code{MD5()}, @code{ENCODE()}, @code{DECODE()}, -@code{PERIOD_ADD()}, @code{PERIOD_DIFF()}, @code{TO_DAYS()}, or -@code{WEEKDAY()} functions. - -@item -Use of @code{TRIM()} to trim substrings. ANSI SQL only supports removal -of single characters. - -@item -The @code{GROUP BY} functions @code{STD()}, @code{BIT_OR()}, and -@code{BIT_AND()}. - -@item -Use of @code{REPLACE} instead of @code{DELETE} + @code{INSERT}. -@xref{REPLACE, , @code{REPLACE}}. - -@item -The @code{FLUSH}, @code{RESET} and @code{DO} statements. - -@item -The ability to set variables in a statement with @code{:=}: -@example -SELECT @@a:=SUM(total),@@b=COUNT(*),@@a/@@b AS avg FROM test_table; -SELECT @@t1:=(@@t2:=1)+@@t3:=4,@@t1,@@t2,@@t3; -@end example - -@end itemize - - -@node Differences from ANSI, Bugs, Extensions to ANSI, Compatibility -@subsection MySQL Differences Compared to ANSI SQL92 - -We try to make MySQL Server follow the ANSI SQL standard and the -ODBC SQL standard, but in some cases MySQL Server does things -differently: - -@itemize @bullet -@item -For @code{VARCHAR} columns, trailing spaces are removed when the value is -stored. @xref{Bugs}. - -@item -In some cases, @code{CHAR} columns are silently changed to @code{VARCHAR} -columns. @xref{Silent column changes}. - -@item -Privileges for a table are not automatically revoked when you delete a -table. You must explicitly issue a @code{REVOKE} to revoke privileges for -a table. @xref{GRANT, , @code{GRANT}}. - -@item -@code{NULL AND FALSE} will evaluate to @code{NULL} and not to @code{FALSE}. -This is because we don't think it's good to have to evaluate a lot of -extra conditions in this case. -@end itemize - -@menu -* ANSI diff Sub-selects:: Sub@code{SELECT}s -* ANSI diff SELECT INTO TABLE:: @code{SELECT INTO TABLE} -* ANSI diff Transactions:: Transactions and Atomic Operations -* ANSI diff Triggers:: Stored Procedures and Triggers -* ANSI diff Foreign Keys:: Foreign Keys -* ANSI diff Views:: Views -* ANSI diff comments:: @samp{--} as the Start of a Comment -@end menu - -For a prioritised list indicating when new extensions will be added to -MySQL Server, you should consult the online MySQL TODO list at -@uref{http://www.mysql.com/documentation/manual.php?section=TODO}. -That is the latest version of the TODO list in this manual. @xref{TODO}. - - -@node ANSI diff Sub-selects, ANSI diff SELECT INTO TABLE, Differences from ANSI, Differences from ANSI -@subsubsection Sub@code{SELECT}s - -@cindex sub@code{SELECT}s - -MySQL Server currently only supports nested queries of the form -@code{INSERT ... SELECT ...} and @code{REPLACE ... SELECT ...}. -You can, however, use the function @code{IN()} in other contexts. -Subselects are currently being implemented in the 4.1 development tree. - -Meanwhile, you can often rewrite the query without a subselect: - -@example -SELECT * FROM table1 WHERE id IN (SELECT id FROM table2); -@end example - -This can be rewritten as: - -@example -SELECT table1.* FROM table1,table2 WHERE table1.id=table2.id; -@end example - -The queries: -@example -SELECT * FROM table1 WHERE id NOT IN (SELECT id FROM table2); -SELECT * FROM table1 WHERE NOT EXISTS (SELECT id FROM table2 - WHERE table1.id=table2.id); -@end example - -Can be rewritten as: - -@example -SELECT table1.* FROM table1 LEFT JOIN table2 ON table1.id=table2.id - WHERE table2.id IS NULL; -@end example - -For more complicated subqueries you can often create temporary tables -to hold the subquery. In some cases, however, this option will not -work. The most frequently encountered of these cases arises with -@code{DELETE} statements, for which standard SQL does not support joins -(except in subselects). For this situation there are two options -available until subqueries are supported by MySQL Server. - -The first option is to use a procedural programming language (such as -Perl or PHP) to submit a @code{SELECT} query to obtain the primary keys -for the records to be deleted, and then use these values to construct -the @code{DELETE} statement (@code{DELETE FROM ... WHERE ... IN (key1, -key2, ...)}). - -The second option is to use interactive SQL to construct a set of -@code{DELETE} statements automatically, using the MySQL -extension @code{CONCAT()} (in lieu of the standard @code{||} operator). -For example: - -@example -SELECT CONCAT('DELETE FROM tab1 WHERE pkid = ', "'", tab1.pkid, "'", ';') - FROM tab1, tab2 - WHERE tab1.col1 = tab2.col2; -@end example - -You can place this query in a script file and redirect input from it to -the @code{mysql} command-line interpreter, piping its output back to a -second instance of the interpreter: - -@example -shell> mysql --skip-column-names mydb < myscript.sql | mysql mydb -@end example - -MySQL Server 4.0 supports multi-table deletes that can be used to -efficiently delete rows based on information from one table or even -from many tables at the same time. - - -@node ANSI diff SELECT INTO TABLE, ANSI diff Transactions, ANSI diff Sub-selects, Differences from ANSI -@subsubsection @code{SELECT INTO TABLE} - -@findex SELECT INTO TABLE - -MySQL Server doesn't yet support the Oracle SQL extension: -@code{SELECT ... INTO TABLE ...}. MySQL Server supports instead the -ANSI SQL syntax @code{INSERT INTO ... SELECT ...}, which is basically -the same thing. @xref{INSERT SELECT}. - -@example -INSERT INTO tblTemp2 (fldID) SELECT tblTemp1.fldOrder_ID - FROM tblTemp1 WHERE tblTemp1.fldOrder_ID > 100; -@end example - -Alternatively, you can use @code{SELECT INTO OUTFILE...} or @code{CREATE -TABLE ... SELECT}. - - -@node ANSI diff Transactions, ANSI diff Triggers, ANSI diff SELECT INTO TABLE, Differences from ANSI -@subsubsection Transactions and Atomic Operations - -@findex COMMIT -@findex ROLLBACK -@cindex transactions, support -@cindex transaction-safe tables -@cindex tables, updating -@cindex updating, tables -@cindex @code{InnoDB} tables -@cindex @code{BDB} tables -@cindex @code{ACID} - -MySQL Server supports transactions with the @code{InnoDB} and @code{BDB} -@code{Transactional table handlers}. @xref{Table types}. -@code{InnoDB} provides @code{ACID} compliancy. - -However, the non-transactional table types in MySQL Server such as -@code{MyISAM} follow another paradigm for data integrity called -``@code{Atomic Operations}.'' Atomic operations often offer equal or -even better integrity with much better performance. -With MySQL Server supporting both paradigms, the user is able to decide if -he needs the speed of atomic operations or if he need to use -transactional features in his applications. This choice can be made -on a per-table basis. - -How does one use the features of MySQL Server to maintain rigorous integrity -and how do these features compare with the transactional paradigm? - -@enumerate -@item -In the transactional paradigm, if your applications are written in a -way that is dependent on the calling of @code{ROLLBACK} instead of -@code{COMMIT} in critical situations, transactions are more -convenient. Transactions also ensure that unfinished updates or -corrupting activities are not committed to the database; the server is -given the opportunity to do an automatic rollback and your database is -saved. - -MySQL Server, in almost all cases, allows you to resolve potential problems -by including simple checks before updates and by running simple scripts -that check the databases for inconsistencies and automatically repair -or warn if such an inconsistency occurs. Note that just by using the -MySQL log or even adding one extra log, one can normally fix tables -perfectly with no data integrity loss. - -@item -More often than not, fatal transactional updates can be rewritten to be -atomic. Generally speaking, all integrity problems that transactions -solve can be done with @code{LOCK TABLES} or atomic updates, ensuring -that you never will get an automatic abort from the database, which is -a common problem with transactional databases. - -@item -Even a transactional system can lose data if the server goes down. -The difference between different systems lies in just how small the -time-lap is where they could lose data. No system is 100% secure, only -``secure enough.'' Even Oracle, reputed to be the safest of -transactional databases, is reported to sometimes lose data in such -situations. - -To be safe with MySQL Server, whether using transactional tables or not, you -only need to have backups and have the update logging turned on. With -this you can recover from any situation that you could with any -other transactional database. It is, of course, always good to have -backups, independent of which database you use. -@end enumerate - -The transactional paradigm has its benefits and its drawbacks. Many -users and application developers depend on the ease with which they -can code around problems where an abort appears to be, or is necessary. -However, even if you are new to the atomic operations paradigm, or more -familiar with transactions, do consider the speed benefit that -non-transactional tables can offer on the order of three to five times -the speed of the fastest and most optimally tuned transactional tables. - -In situations where integrity is of highest importance, MySQL Server offers -transaction-level or better reliability and integrity even for -non-transactional tables. -If you lock tables with @code{LOCK TABLES}, all updates will stall -until any integrity checks are made. If you only obtain a read lock -(as opposed to a write lock), reads and inserts are still allowed -to happen. The new inserted records will not be seen by any of the -clients that have a read lock until they release their read -locks. With @code{INSERT DELAYED} you can queue inserts into a local -queue, until the locks are released, without having the client wait -for the insert to complete. @xref{INSERT DELAYED}. - -``Atomic,'' in the sense that we mean it, is nothing magical. It only -means that you can be sure that while each specific update is running, -no other user can interfere with it, and there will never be an -automatic rollback (which can happen with transactional tables if you -are not very careful). MySQL Server also guarantees that there will not be -any dirty reads. - -Following are some techniques for working with non-transactional tables: - -@itemize @bullet -@item -Loops that need transactions normally can be coded with the help of -@code{LOCK TABLES}, and you don't need cursors when you can update -records on the fly. - -@item -To avoid using @code{ROLLBACK}, you can use the following strategy: - -@enumerate -@item -Use @code{LOCK TABLES ...} to lock all the tables you want to access. -@item -Test conditions. -@item -Update if everything is okay. -@item -Use @code{UNLOCK TABLES} to release your locks. -@end enumerate - -This is usually a much faster method than using transactions with -possible @code{ROLLBACK}s, although not always. The only situation -this solution doesn't handle is when someone kills the threads in the -middle of an update. In this case, all locks will be released but some -of the updates may not have been executed. - -@item -You can also use functions to update records in a single operation. -You can get a very efficient application by using the following -techniques: - -@itemize @bullet -@item Modify fields relative to their current value. -@item Update only those fields that actually have changed. -@end itemize - -For example, when we are doing updates to some customer information, we -update only the customer data that has changed and test only that none of -the changed data, or data that depends on the changed data, has changed -compared to the original row. The test for changed data is done with the -@code{WHERE} clause in the @code{UPDATE} statement. If the record wasn't -updated, we give the client a message: "Some of the data you have changed -has been changed by another user." Then we show the old row versus the new -row in a window, so the user can decide which version of the customer record -he should use. - -This gives us something that is similar to column locking but is actually -even better because we only update some of the columns, using values that -are relative to their current values. This means that typical @code{UPDATE} -statements look something like these: - -@example -UPDATE tablename SET pay_back=pay_back+'relative change'; - -UPDATE customer - SET - customer_date='current_date', - address='new address', - phone='new phone', - money_he_owes_us=money_he_owes_us+'new_money' - WHERE - customer_id=id AND address='old address' AND phone='old phone'; -@end example - -As you can see, this is very efficient and works even if another client -has changed the values in the @code{pay_back} or @code{money_he_owes_us} -columns. - -@item -@findex mysql_insert_id() -@findex LAST_INSERT_ID() -In many cases, users have wanted @code{ROLLBACK} and/or @code{LOCK -TABLES} for the purpose of managing unique identifiers for some tables. -This can be handled much more efficiently by using an -@code{AUTO_INCREMENT} column and either the SQL function -@code{LAST_INSERT_ID()} or the C API function @code{mysql_insert_id()}. -@xref{mysql_insert_id, , @code{mysql_insert_id()}}. - -@cindex rows, locking -@cindex locking, row-level -You can generally code around row-level locking. Some situations really -need it, but they are very few. @code{InnoDB} tables support row-level -locking. With MyISAM, you can use a flag column in the table and do -something like the following: - -@example -UPDATE tbl_name SET row_flag=1 WHERE id=ID; -@end example - -MySQL returns 1 for the number of affected rows if the row was -found and @code{row_flag} wasn't already 1 in the original row. - -You can think of it as though MySQL Server changed the preceding query to: - -@example -UPDATE tbl_name SET row_flag=1 WHERE id=ID AND row_flag <> 1; -@end example -@end itemize - - -@node ANSI diff Triggers, ANSI diff Foreign Keys, ANSI diff Transactions, Differences from ANSI -@subsubsection Stored Procedures and Triggers - -@cindex stored procedures and triggers, defined -@cindex procedures, stored -@cindex triggers, stored - -A stored procedure is a set of SQL commands that can be compiled and stored -in the server. Once this has been done, clients don't need to keep re-issuing -the entire query but can refer to the stored procedure. This provides better -performance because the query has to be parsed only once, and less information -needs to be sent between the server and the client. You can also raise the -conceptual level by having libraries of functions in the server. - -A trigger is a stored procedure that is invoked when a particular event -occurs. For example, you can install a stored procedure that is triggered -each time a record is deleted from a transaction table and that automatically -deletes the corresponding customer from a customer table when all his -transactions are deleted. - -The planned update language will be able to handle stored procedures. -Our aim is to have stored procedures implemented in MySQL Server around -version 5.0. We are also looking at triggers. - - -@node ANSI diff Foreign Keys, ANSI diff Views, ANSI diff Triggers, Differences from ANSI -@subsubsection Foreign Keys - -@cindex foreign keys -@cindex keys, foreign - -Note that foreign keys in SQL are not used to join tables, but are used -mostly for checking referential integrity (foreign key constraints). If -you want to get results from multiple tables from a @code{SELECT} -statement, you do this by joining tables: - -@example -SELECT * FROM table1,table2 WHERE table1.id = table2.id; -@end example - -@xref{JOIN, , @code{JOIN}}. @xref{example-Foreign keys}. - -In MySQL Server 3.23.44 and up, @code{InnoDB} tables support checking of -foreign key constraints. @xref{InnoDB}. For other table types, MySQL Server -does parse the @code{FOREIGN KEY} syntax in @code{CREATE TABLE} -commands, but without further action being taken. - -The @code{FOREIGN KEY} syntax without @code{ON DELETE ...} is mostly -used for documentation purposes. Some ODBC applications may use this -to produce automatic @code{WHERE} clauses, but this is usually easy to -override. @code{FOREIGN KEY} is sometimes used as a constraint check, -but this check is unnecessary in practice if rows are inserted into the -tables in the right order. - -In MySQL Server, you can work around the problem of @code{ON DELETE ...} not -being implemented by adding the appropriate @code{DELETE} statement to -an application when you delete records from a table that has a foreign -key. In practice this is as quick (in some cases quicker) and much more -portable than using foreign keys. - -In MySQL Server 4.0 you can use multi-table delete to delete rows from many -tables with one command. @xref{DELETE}. - -In the near future we will extend the @code{FOREIGN KEY} implementation -so that the information will be saved in the table specification file -and may be retrieved by @code{mysqldump} and ODBC. At a later stage we -will implement the foreign key constraints for applications that can't -easily be coded to avoid them. - -Do keep in mind that foreign keys are often misused, which can cause -severe problems. Even when used properly, it is not a magic solution for -the referential integrity problem, although it does make things easier -in some cases. - -Some advantages of foreign key enforcement: - -@itemize @bullet -@item -Assuming proper design of the relations, foreign key constraints will -make it more difficult for a programmer to introduce an inconsistency -into the database. - -@item -Using cascading updates and deletes can simplify the client code. - -@item -Properly designed foreign key rules aid in documenting relations -between tables. -@end itemize - -Disadvantages: - -@itemize @bullet -@item -Mistakes, which are easy to make in designing key relations, can cause -severe problems@-for example, circular rules, or the wrong combination -of cascading deletes. - -@item -A properly written application will make sure internally that it is -not violating referential integrity constraints before proceding with -a query. Thus, additional checks on the database level will only slow -down performance for such an application. - -@item -It is not uncommon for a DBA to make such a complex topology of -relations that it becomes very difficult, and in some cases impossible, -to back up or restore individual tables. -@end itemize - - -@node ANSI diff Views, ANSI diff comments, ANSI diff Foreign Keys, Differences from ANSI -@subsubsection Views - -@cindex views - -It is planned to implement views in MySQL Server around version 5.0. - -Views are mostly useful for letting users access a set of relations as one -table (in read-only mode). Many SQL databases don't allow one to update -any rows in a view, but you have to do the updates in the separate tables. - -As MySQL Server is mostly used in applications and on web systems where -the application writer has full control on the database usage, most of -our users haven't regarded views to be very important. -(At least no one has been interested enough in this to be prepared to -finance the implementation of views.) - -One doesn't need views in MySQL Server to restrict access to columns, -as MySQL Server has a very sophisticated privilege system. -@xref{Privilege system}. - - -@node ANSI diff comments, , ANSI diff Views, Differences from ANSI -@subsubsection @samp{--} as the Start of a Comment - -@cindex comments, starting -@cindex starting, comments - -Some other SQL databases use @samp{--} to start comments. -MySQL Server has @samp{#} as the start comment character. You can also use -the C comment style @code{/* this is a comment */} with MySQL Server. -@xref{Comments}. - -MySQL Server Version 3.23.3 and above support the @samp{--} comment style, -provided the comment is followed by a space. This is because this -comment style has caused many problems with automatically generated -SQL queries that have used something like the following code, where -we automatically insert the value of the payment for -@code{!payment!}: - -@example -UPDATE tbl_name SET credit=credit-!payment! -@end example - -Think about what happens if the value of @code{payment} is negative. -Because @code{1--1} is legal in SQL, the consequences of allowing -comments to start with @samp{--} are terrible. - -Using our implementation of this method of commenting in MySQL Server -Version 3.23.3 and up, @code{1-- This is a comment} is actually safe. - -Another safe feature is that the @code{mysql} command-line client -removes all lines that start with @samp{--}. - - -The following information is relevant only if you are running a -MySQL version earlier than 3.23.3: - -If you have a SQL program in a text file that contains @samp{--} -comments you should use: - -@example -shell> replace " --" " #" < text-file-with-funny-comments.sql \ - | mysql database -@end example - -instead of the usual: - -@example -shell> mysql database < text-file-with-funny-comments.sql -@end example - -You can also edit the command file ``in place'' to change the @samp{--} -comments to @samp{#} comments: - -@example -shell> replace " --" " #" -- text-file-with-funny-comments.sql -@end example - -Change them back with this command: - -@example -shell> replace " #" " --" -- text-file-with-funny-comments.sql -@end example - - -@node Bugs, , Differences from ANSI, Compatibility -@subsection Known Errors and Design Deficiencies in MySQL - -@cindex bugs, known -@cindex errors, known -@cindex design, issues -@cindex known errors - -The following problems are known and have a very high priority to get -fixed: - -@itemize @bullet -@item -@code{ANALYZE TABLE} on a BDB table may in some case make the table -unusable until one has restarted @code{mysqld}. When this happens you will -see errors like the following in the MySQL error file: - -@example -001207 22:07:56 bdb: log_flush: LSN past current end-of-log -@end example - -@item -Don't execute @code{ALTER TABLE} on a @code{BDB} table on which you are -running multi-statement transactions until all those transactions complete. -(The transaction will probably be ignored.) - -@item -@code{ANALYZE TABLE}, @code{OPTIMIZE TABLE}, and @code{REPAIR TABLE} may -cause problems on tables for which you are using @code{INSERT DELAYED}. - -@item -Doing a @code{LOCK TABLE ...} and @code{FLUSH TABLES ...} doesn't -guarantee that there isn't a half-finished transaction in progress on the -table. - -@item -BDB tables are a bit slow to open. If you have many BDB tables in a -database, it will take a long time to use the @code{mysql} client on the -database if you are not using the @code{-A} option or if you are using -@code{rehash}. This is especially notable when you have a big table -cache. - -@end itemize - -The following problems are known and will be fixed in due time: - -@itemize @bullet - -@item -When using @code{SET CHARACTER SET}, one can't use translated -characters in database, table, and column names. - -@item -One can't use @code{_} or @code{%} with @code{ESCAPE} in @code{LIKE -... ESCAPE}. - -@item -If you have a @code{DECIMAL} column with a number stored in different -formats (+01.00, 1.00, 01.00), @code{GROUP BY} may regard each value -as a different value. - -@item -@code{DELETE FROM merge_table} used without a @code{WHERE} -will only clear the mapping for the table, not delete everything in the -mapped tables. - -@item -You cannot build the server in another directory when using -MIT-pthreads. Because this requires changes to MIT-pthreads, we are not -likely to fix this. @xref{MIT-pthreads}. - -@item -@code{BLOB} values can't ``reliably'' be used in @code{GROUP BY} or -@code{ORDER BY} or @code{DISTINCT}. Only the first @code{max_sort_length} -bytes (default 1024) are used when comparing @code{BLOB}s in these cases. -This can be changed with the @code{-O max_sort_length} option to -@code{mysqld}. A workaround for most cases is to use a substring: -@code{SELECT DISTINCT LEFT(blob,2048) FROM tbl_name}. - -@item -Calculation is done with @code{BIGINT} or @code{DOUBLE} (both are -normally 64 bits long). It depends on the function which precision one -gets. The general rule is that bit functions are done with @code{BIGINT} -precision, @code{IF}, and @code{ELT()} with @code{BIGINT} or @code{DOUBLE} -precision and the rest with @code{DOUBLE} precision. One should try to -avoid using unsigned long long values if they resolve to be bigger than -63 bits (9223372036854775807) for anything else than bit fields! -MySQL Server 4.0 has better @code{BIGINT} handling than 3.23. - -@item -All string columns, except @code{BLOB} and @code{TEXT} columns, automatically -have all trailing spaces removed when retrieved. For @code{CHAR} types this -is okay, and may be regarded as a feature according to ANSI SQL92. The bug is -that in MySQL Server, @code{VARCHAR} columns are treated the same way. - -@item -You can only have up to 255 @code{ENUM} and @code{SET} columns in one table. - -@item -In @code{MIN()}, @code{MAX()} and other aggregate functions, MySQL -currently compares @code{ENUM} and @code{SET} columns by their string -value rather than by the string's relative position in the set. - -@item -@code{safe_mysqld} redirects all messages from @code{mysqld} to the -@code{mysqld} log. One problem with this is that if you execute -@code{mysqladmin refresh} to close and reopen the log, -@code{stdout} and @code{stderr} are still redirected to the old log. -If you use @code{--log} extensively, you should edit @code{safe_mysqld} to -log to @file{'hostname'.err} instead of @file{'hostname'.log} so you can -easily reclaim the space for the old log by deleting the old one and -executing @code{mysqladmin refresh}. - -@item -In the @code{UPDATE} statement, columns are updated from left to right. If -you refer to an updated column, you will get the updated value instead of the -original value. For example: - -@example -mysql> UPDATE tbl_name SET KEY=KEY+1,KEY=KEY+1; -@end example - -This will update @code{KEY} with @code{2} instead of with @code{1}. - -@item -You can't use temporary tables more than once in the same query. -For example, the following doesn't work: - -@example -mysql> SELECT * FROM temporary_table, temporary_table AS t2; -@end example - -@item -@code{RENAME} doesn't work with @code{TEMPORARY} tables or tables used in a -@code{MERGE} table. - -@item -The optimiser may handle @code{DISTINCT} differently if you are using -'hidden' columns in a join or not. In a join, hidden columns are -counted as part of the result (even if they are not shown) while in -normal queries hidden columns don't participate in the @code{DISTINCT} -comparison. We will probably change this in the future to never compare -the hidden columns when executing @code{DISTINCT}. - -An example of this is: - -@example -SELECT DISTINCT mp3id FROM band_downloads - WHERE userid = 9 ORDER BY id DESC; -@end example - -and - -@example -SELECT DISTINCT band_downloads.mp3id - FROM band_downloads,band_mp3 - WHERE band_downloads.userid = 9 - AND band_mp3.id = band_downloads.mp3id - ORDER BY band_downloads.id DESC; -@end example - -In the second case you may in MySQL Server 3.23.x get two identical rows -in the result set (because the hidden @code{id} column may differ). - -Note that this happens only for queries where you don't have the -ORDER BY columns in the result, something that you are not allowed -to do in ANSI SQL. - -@item -Because MySQL Server allows you to work with table types that don't -support transactions, and thus can't @code{rollback} data, some things -behave a little differently in MySQL Server than in other SQL servers. -This is just to ensure that MySQL Server never needs to do a rollback -for a SQL command. This may be a little awkward at times as column -values must be checked in the application, but this will actually give -you a nice speed increase as it allows MySQL Server to do some -optimisations that otherwise would be very hard to do. - -If you set a column to an incorrect value, MySQL Server will, instead of -doing a rollback, store the @code{best possible value} in the column: - -@itemize @minus -@item -If you try to store a value outside the range in a numerical column, -MySQL Server will instead store the smallest or biggest possible value in -the column. - -@item -If you try to store a string that doesn't start with a number into a -numerical column, MySQL Server will store 0 into it. - -@item -If you try to store @code{NULL} into a column that doesn't take -@code{NULL} values, MySQL Server will store 0 or @code{''} (empty -string) in it instead. (This behaviour can, however, be changed with the --DDONT_USE_DEFAULT_FIELDS compile option.) - -@item -MySQL allows you to store some wrong date values into @code{DATE} and -@code{DATETIME} columns (like 2000-02-31 or 2000-02-00). The idea is -that it's not the SQL server job to validate date. If MySQL can store a -date and retrieve exactly the same date, then MySQL will store the -date. If the date is totally wrong (outside the server's ability to store -it), then the special date value 0000-00-00 will be stored in the column. - -@item -If you set an @code{ENUM} column to an unsupported value, it will be set to -the error value @code{empty string}, with numeric value 0. - -@item -If you set a @code{SET} column to an unsupported value, the value will -be ignored. - -@end itemize - -@item -If you execute a @code{PROCEDURE} on a query that returns an empty set, -in some cases the @code{PROCEDURE} will not transform the columns. - -@item -Creation of a table of type @code{MERGE} doesn't check if the underlying -tables are of compatible types. - -@item -MySQL Server can't yet handle @code{NaN}, @code{-Inf}, and @code{Inf} -values in double. Using these will cause problems when trying to export -and import data. We should as an intermediate solution change @code{NaN} to -@code{NULL} (if possible) and @code{-Inf} and @code{Inf} to the -minimum respective maximum possible @code{double} value. - -@item -@code{LIMIT} on negative numbers are treated as big positive numbers. - -@item -If you use @code{ALTER TABLE} to first add a @code{UNIQUE} index to a -table used in a @code{MERGE} table and then use @code{ALTER TABLE} to -add a normal index on the @code{MERGE} table, the key order will be -different for the tables if there was an old key that was not unique in the -table. This is because @code{ALTER TABLE} puts @code{UNIQUE} keys before -normal keys to be able to detect duplicate keys as early as possible. -@end itemize - -The following are known bugs in earlier versions of MySQL: - -@itemize @bullet -@item -You can get a hung thread if you do a @code{DROP TABLE} on a table that is -one among many tables that is locked with @code{LOCK TABLES}. - -@item -In the following case you can get a core dump: - -@itemize @minus -@item -Delayed insert handler has pending inserts to a table. - -@item -@code{LOCK table} with @code{WRITE}. - -@item -@code{FLUSH TABLES}. -@end itemize - -@item -Before MySQL Server Version 3.23.2 an @code{UPDATE} that updated a key with -a @code{WHERE} on the same key may have failed because the key was used to -search for records and the same row may have been found multiple times: - -@example -UPDATE tbl_name SET KEY=KEY+1 WHERE KEY > 100; -@end example - -A workaround is to use: - -@example -mysql> UPDATE tbl_name SET KEY=KEY+1 WHERE KEY+0 > 100; -@end example - -This will work because MySQL Server will not use an index on expressions in -the @code{WHERE} clause. - -@item -Before MySQL Server Version 3.23, all numeric types where treated as -fixed-point fields. That means you had to specify how many decimals -a floating-point field shall have. All results were returned with the -correct number of decimals. -@end itemize - -For platform-specific bugs, see the sections about compiling and porting. - - -@node TODO, Comparisons, Compatibility, Introduction -@section MySQL and The Future (The TODO) - -@cindex ToDo list for MySQL - -@menu -* TODO MySQL 4.0:: Things That Should be in 4.0 -* TODO MySQL 4.1:: Things That Should be in 4.1 -* TODO future:: Things That Must be Done in the Near Future -* TODO sometime:: Things That Have to be Done Sometime -* TODO unplanned:: Things We Don't Plan To Do -@end menu - -This section lists the features that we plan to implement in MySQL Server. - -Everything in this list is approximately in the order it will be done. If you -want to affect the priority order, please register a license or support us and -tell us what you want to have done more quickly. @xref{Licensing and Support}. - -The plan is that we in the future will support the full ANSI SQL99 -standard, but with a lot of useful extensions. The challenge is to do -this without sacrificing the speed or compromising the code. - - -@node TODO MySQL 4.0, TODO MySQL 4.1, TODO, TODO -@subsection Things That Should be in 4.0 - -All done. We now only do bug fixes for MySQL 4.0. @xref{News-4.0.x}. -Development has shifted to 4.1 - -@node TODO MySQL 4.1, TODO future, TODO MySQL 4.0, TODO -@subsection Things That Should be in 4.1 - -The following features are planned for inclusion into MySQL 4.1. -Note that because we have many developers that are working on different -projects, there will also be many additional features. There is also a -small chance that some of these features will be added to MySQL 4.0. -Some of the work on MySQL 4.1 is already in progress. - -@itemize @bullet -@item -Subqueries. -@example -SELECT id FROM t WHERE grp IN (SELECT grp FROM g WHERE u > 100); -@end example -@item -New table definition file format (@file{.frm} files). This will enable us -to not run out of bits when adding more table options. One will still -be able to use the old @file{.frm} file format with 4.0. All newly created -tables will, however, use the new format. - -The new file format will enable us to add new column types, more options -for keys, and possibly to store and retrieve @code{FOREIGN KEY} definitions. -@item -@code{SHOW COLUMNS FROM table_name} (used by @code{mysql} client to allow -expansions of column names) should not open the table, only the -definition file. This will require less memory and be much faster. -@item -Foreign keys for @code{MyISAM} tables, including cascading delete. -@item -Fail-safe replication. -@item -Replication should work with @code{RAND()} and user variables @code{@@var}. -@item -Online backup with very low performance penalty. The online backup will -make it easy to add a new replication slave without taking down the -master. -@item -Derived tables: -@example -SELECT a.col1, b.col2 - FROM (SELECT MAX(col1) AS col1 FROM root_table) a, - other_table b - WHERE a.col1=b.col1; -@end example - -This could be done by automatically creating temporary tables for the -derived tables for the duration of the query. -@item -@code{ROLLUP} and @code{CUBE} OLAP (Online Analytical Processing) grouping -options for data warehousing applications. -@item -Allow @code{DELETE} on @code{MyISAM} tables to use the record cache. -To do this, we need to update the threads record cache when we update -the @file{.MYD} file. -@item -When using @code{SET CHARACTER SET} we should translate the whole query -at once and not only strings. This will enable users to use the translated -characters in database, table, and column names. -@item -Add @code{record_in_range()} method to @code{MERGE} tables to be -able to choose the right index when there are many to choose from. We should -also extend the info interface to get the key distribution for each index, -if @code{analyze} is run on all subtables. -@item -Resolving the issue of @code{RENAME TABLE} on a table used in an active -@code{MERGE} table possibly corrupting the table. -@item -A faster, smaller embedded MySQL library (compatible with the old one). -@item -Stable OpenSSL support (MySQL 4.0 supports rudimentary, not 100% tested, -support for OpenSSL). -@item -Add support for sorting on @code{UNICODE}. -@item -Character set casts and syntax for handling multiple character sets. -@item -Help for all commands from the client. -@item -New faster client/server protocol which will support prepared statements, -bound parameters, and bound result columns, binary transfer of data, -warnings... -@item -Add database and real table name (in case of alias) to the MYSQL_FIELD -structure. -@item -Add options to the client/server protocol to get progress notes -for long running commands. -@item -Implement @code{RENAME DATABASE}. To make this safe for all table handlers, -it should work as follows: -@itemize @bullet -@item -Create the new database. -@item -For every table do a rename of the table to another database, as -we do with the @code{RENAME} command. -@item -Drop the old database. -@end itemize -@item -Add true @code{VARCHAR} support (there is already support for this in -@code{MyISAM}). -@item -Optimise @code{BIT} type to take 1 bit (now @code{BIT} takes 1 char). -@item -New internal file interface change. This will make all file handling much -more general and make it easier to add extensions like RAID. -(the current implementation is a hack.) -@item -Better in-memory (@code{HEAP}) tables: -@itemize @bullet -@item -Support for B-tree indexes -@item -Dynamic size rows -@item -Faster row handling (less copying) -@end itemize -@end itemize - - -@node TODO future, TODO sometime, TODO MySQL 4.1, TODO -@subsection Things That Must be Done in the Near Future - -@itemize @bullet -@item -Atomic multi-table updates: -@example -UPDATE items,month SET items.price=month.price -WHERE items.id=month.id; -@end example -@item -Don't allow more than a defined number of threads to run MyISAM recover -at the same time. -@item -Change @code{INSERT ... SELECT} to optionally use concurrent inserts. -@item -Return the original field types() when doing @code{SELECT MIN(column) -... GROUP BY}. -@item -Multiple result sets. -@item -Make it possible to specify @code{long_query_time} with a granularity -in microseconds. -@item -Link the @code{myisampack} code into the server. -@item -Port of the MySQL code to QNX. -@item -Port of the MySQL code to BeOS. -@item -Port of the MySQL clients to LynxOS. -@item -Add a temporary key buffer cache during @code{INSERT/DELETE/UPDATE} so that we -can gracefully recover if the index file gets full. -@item -If you perform an @code{ALTER TABLE} on a table that is symlinked to another -disk, create temporary tables on this disk. -@item -Implement a @code{DATE/DATETIME} type that handles time zone information -properly so that dealing with dates in different time zones is easier. -@item -FreeBSD and MIT-pthreads; do sleeping threads take CPU time? -@item -Check if locked threads take any CPU time. -@item -Fix configure so that one can compile all libraries (like @code{MyISAM}) -without threads. -@item -Add an option to periodically flush key pages for tables with delayed keys -if they haven't been used in a while. -@item -Allow join on key parts (optimisation issue). -@item -@code{INSERT SQL_CONCURRENT} and @code{mysqld --concurrent-insert} to do -a concurrent insert at the end of the file if the file is read-locked. -@item -Server-side cursors. -@item -Check if @code{lockd} works with modern Linux kernels; if not, we have -to fix @code{lockd}! To test this, start @code{mysqld} with -@code{--enable-locking} and run the different fork* test suits. They shouldn't -give any errors if @code{lockd} works. -@item -Allow SQL variables in @code{LIMIT}, like in @code{LIMIT @@a,@@b}. -@item -Allow update of variables in @code{UPDATE} statements. For example: -@code{UPDATE TABLE foo SET @@a=a+b,a=@@a, b=@@a+c}. -@item -Change when user variables are updated so that one can use them with -@code{GROUP BY}, as in the following example: -@code{SELECT id, @@a:=COUNT(*), SUM(sum_col)/@@a FROM table_name GROUP BY id}. -@item -Don't add automatic @code{DEFAULT} values to columns. Give an error when using -an @code{INSERT} that doesn't contain a column that doesn't have a -@code{DEFAULT}. -@item -Fix @file{libmysql.c} to allow two @code{mysql_query()} commands in a row -without reading results or give a nice error message when one does this. -@item -Check why MIT-pthreads @code{ctime()} doesn't work on some FreeBSD systems. -@item -Add an @code{IMAGE} option to @code{LOAD DATA INFILE} to not update -@code{TIMESTAMP} and @code{AUTO_INCREMENT} fields. -@item -Added @code{LOAD DATE INFILE ... UPDATE} syntax. -@itemize @bullet -@item -For tables with primary keys, if the data contains the primary key, -entries matching that primary key are updated from the remainder of the -columns. However, columns @strong{missing} from the incoming data feed are not -touched. -@item -For tables with primary keys that are missing some part of the key -in the incoming data stream, or that have no primary key, the feed is -treated as a @code{LOAD DATA INFILE ... REPLACE INTO} now. -@end itemize -@item -Make @code{LOAD DATA INFILE} understand syntax like: -@example -LOAD DATA INFILE 'file_name.txt' INTO TABLE tbl_name - TEXT_FIELDS (text_field1, text_field2, text_field3) - SET table_field1=CONCAT(text_field1, text_field2), - table_field3=23 - IGNORE text_field3 -@end example -This can be used to skip over extra columns in the text file, -or update columns based on expressions of the read data. -@item -@code{LOAD DATA INFILE 'file_name' INTO TABLE 'table_name' ERRORS TO err_table_name}. -This would cause any errors and warnings to be logged into the -@code{err_table_name} table. That table would have a structure like: - -@example -line_number - line number in datafile -error_message - the error/warning message -and maybe -data_line - the line from the datafile -@end example -@item -Automatic output from @code{mysql} to Netscape. -@item -@code{LOCK DATABASES} (with various options.) -@item -Functions: -ADD_TO_SET(value,set) and REMOVE_FROM_SET(value,set). -@item -Add use of @code{t1 JOIN t2 ON ...} and @code{t1 JOIN t2 USING ...} -Currently, you can only use this syntax with @code{LEFT JOIN}. -@item -Many more variables for @code{show status}. Records reads and -updates. Selects on 1 table and selects with joins. Mean number of -tables in select. Number of @code{ORDER BY} and @code{GROUP BY} queries. -@item -If you abort @code{mysql} in the middle of a query, you should open -another connection and kill the old running query. -Alternatively, an attempt should be made to detect this in the server. -@item -Add a handler interface for table information so that you can use it as a system -table. This would be a bit slow if you requested information about all tables, -but very flexible. @code{SHOW INFO FROM tbl_name} for basic table information -should be implemented. -@item -@code{NATURAL JOIN}. -@item -Allow @code{SELECT a FROM crash_me LEFT JOIN crash_me2 USING (a)}; in this -case @code{a} is assumed to come from the @code{crash_me} table. -@item -Fix so that @code{ON} and @code{USING} works with the @code{JOIN} -join type. -@item -Oracle-like @code{CONNECT BY PRIOR ...} to search hierarchy structures. -@item -@code{mysqladmin copy database new-database}; requires @code{COPY} -command to be added to @code{mysqld}. -@item -Processlist should show number of queries/threads. -@item -@code{SHOW HOSTS} for printing information about the hostname cache. -@item -@code{DELETE} and @code{REPLACE} options to the @code{UPDATE} statement -(this will delete rows when one gets a duplicate key error while updating). -@item -Change the format of @code{DATETIME} to store fractions of seconds. -@item -Add all missing ANSI92 and ODBC 3.0 types. -@item -Change table names from empty strings to @code{NULL} for calculated columns. -@item -Don't use @code{Item_copy_string} on numerical values to avoid -number->string->number conversion in case of: -@code{SELECT COUNT(*)*(id+0) FROM table_name GROUP BY id} -@item -Make it possible to use the new GNU regexp library instead of the current -one (the GNU library should be much faster than the old one). -@item -Change so that @code{ALTER TABLE} doesn't abort clients -that execute @code{INSERT DELAYED}. -@item -Fix so that when columns are referenced in an @code{UPDATE} clause, -they contain the old values from before the update started. -@item -Add simulation of @code{pread()}/@code{pwrite()} on Windows to enable -concurrent inserts. -@item -A logfile analyser that could parse out information about which tables -are hit most often, how often multi-table joins are executed, etc. It -should help users identify areas or table design that could be optimised -to execute much more efficient queries. -@item -Add @code{SUM(DISTINCT)}. -@item -Add @code{ANY()}, @code{EVERY()}, and @code{SOME()} group functions. In -ANSI SQL these work only on boolean columns, but we can extend these to -work on any columns/expressions by applying: value == 0 -> FALSE and -value <> 0 -> TRUE. -@item -Fix that the type for @code{MAX(column)} is the same as the column type: -@example -mysql> CREATE TABLE t1 (a DATE); -mysql> INSERT INTO t1 VALUES (NOW()); -mysql> CREATE TABLE t2 SELECT MAX(a) FROM t1; -mysql> SHOW COLUMNS FROM t2; -@end example -@item -Come up with a nice syntax for a statement that will @code{UPDATE} the row -if it exists and @code{INSERT} a new row if the row didn't exist -(like @code{REPLACE} works with @code{INSERT} / @code{DELETE}). -@end itemize - - -@node TODO sometime, TODO unplanned, TODO future, TODO -@subsection Things That Have to be Done Sometime - -@itemize @bullet -@item -Implement function: @code{get_changed_tables(timeout,table1,table2,...)}. -@item -Change reading through tables to use memmap when possible. Now only -compressed tables use memmap. -@item -Make the automatic timestamp code nicer. Add timestamps to the update -log with @code{SET TIMESTAMP=#;}. -@item -Use read/write mutex in some places to get more speed. -@item -Full foreign key support in for @code{MyISAM} tables, probably after -the implementation of stored procedures with triggers. -@item -Simple views (first on one table, later on any expression). -@item -Automatically close some tables if a table, temporary table, or temporary files -gets error 23 (not enough open files). -@item -When one finds a field=#, change all occurrences of field to #. Now this -is only done for some simple cases. -@item -Change all const expressions with calculated expressions if possible. -@item -Optimise key = expression. At the moment only key = field or key = -constant are optimised. -@item -Join some of the copy functions for nicer code. -@item -Change @file{sql_yacc.yy} to an inline parser to reduce its size and get -better error messages (5 days). -@item -Change the parser to use only one rule per different number of arguments -in function. -@item -Use of full calculation names in the order part (for ACCESS97). -@item -@code{MINUS}, @code{INTERSECT}, and @code{FULL OUTER JOIN}. -(Currently @code{UNION} [in 4.0] and @code{LEFT OUTER JOIN} are supported.) -@item -@code{SQL_OPTION MAX_SELECT_TIME=#} to put a time limit on a query. -@item -Make the update log write to a database. -@item -Add to @code{LIMIT} to allow retrieval of data from the end of a result set. -@item -Alarm around client connect/read/write functions. -@item -Please note the changes to @code{safe_mysqld}: according to FSSTND (which -Debian tries to follow) PID files should go into @file{/var/run/<progname>.pid} -and log files into @file{/var/log}. It would be nice if you could put the -"DATADIR" in the first declaration of "pidfile" and "log", so the -placement of these files can be changed with a single statement. -@item -Allow a client to request logging. -@item -Add use of @code{zlib()} for @code{gzip}-ed files to @code{LOAD DATA INFILE}. -@item -Fix sorting and grouping of @code{BLOB} columns (partly solved now). -@item -Stored procedures. Triggers are also being looked at. -@item -A simple (atomic) update language that -can be used to write loops and such in the MySQL server. -@item -Change to use semaphores when counting threads. One should first implement -a semaphore library to MIT-pthreads. -@item -Don't assign a new @code{AUTO_INCREMENT} value when one sets a column to 0. -Use @code{NULL} instead. -@item -Add full support for @code{JOIN} with parentheses. -@item -As an alternative for one thread/connection manage a pool of threads -to handle the queries. -@item -Allow one to get more than one lock with @code{GET_LOCK}. When doing this, -one must also handle the possible deadlocks this change will introduce. -@end itemize - -Time is given according to amount of work, not real time. - - -@node TODO unplanned, , TODO sometime, TODO -@subsection Things We Don't Plan To Do - -@itemize @bullet -@item -Nothing; we aim toward full ANSI 92/ANSI 99 compliancy. -@end itemize - - -@node Comparisons, , TODO, Introduction -@section How MySQL Compares to Other Databases - -@cindex databases, MySQL vs. others -@cindex comparisons, MySQL vs. others - -Our users have successfully run their own benchmarks against a number -of @code{Open Source} and traditional database servers. -We are aware of tests against @code{Oracle} server, @code{DB/2} server, -@code{Microsoft SQL Server}, and other commercial products. -Due to legal reasons we are restricted from publishing some of those -benchmarks in our reference manual. - -This section includes a comparison with @code{mSQL} for historical -reasons and with @code{PostgreSQL} as it is also an @code{Open Source} -database. If you have benchmark results that we can publish, please -contact us at @email{benchmarks@@mysql.com}. - -For comparative lists of all supported functions and types as well -as measured operational limits of many different database systems, -see the @code{crash-me} web page at -@uref{http://www.mysql.com/information/crash-me.php}. - -@menu -* Compare mSQL:: How MySQL compares to @code{mSQL} -* Compare PostgreSQL:: How MySQL Compares to @code{PostgreSQL} -@end menu - - -@node Compare mSQL, Compare PostgreSQL, Comparisons, Comparisons -@subsection How MySQL Compares to @code{mSQL} - -@cindex mSQL, MySQL vs mSQL, overview -@table @strong -@item Performance - -For a true comparison of speed, consult the growing MySQL benchmark -suite. @xref{MySQL Benchmarks}. - -Because there is no thread creation overhead, a small parser, few -features, and simple security, @code{mSQL} should be quicker at: - -@itemize @bullet -@item -Tests that perform repeated connects and disconnects, running a very -simple query during each connection. - -@item -@code{INSERT} operations into very simple tables with few columns and keys. - -@item -@code{CREATE TABLE} and @code{DROP TABLE}. - -@item -@code{SELECT} on something that isn't an index. (A table scan is very -easy.) -@end itemize - -Because these operations are so simple, it is hard to be better at -them when you have a higher startup overhead. After the connection -is established, MySQL Server should perform much better. - -On the other hand, MySQL Server is much faster than @code{mSQL} (and -most other SQL implementations) on the following: - -@itemize @bullet -@item -Complex @code{SELECT} operations. - -@item -Retrieving large results (MySQL Server has a better, faster, and safer -protocol). - -@item -Tables with variable-length strings because MySQL Server has more efficient -handling and can have indexes on @code{VARCHAR} columns. - -@item -Handling tables with many columns. - -@item -Handling tables with large record lengths. - -@item -@code{SELECT} with many expressions. - -@item -@code{SELECT} on large tables. - -@item -Handling many connections at the same time. MySQL Server is fully -multi-threaded. Each connection has its own thread, which means that -no thread has to wait for another (unless a thread is modifying -a table another thread wants to access). In @code{mSQL}, once one -connection is established, all others must wait until the first has -finished, regardless of whether the connection is running a query -that is short or long. When the first connection terminates, the -next can be served, while all the others wait again, etc. - -@item -Joins. -@code{mSQL} can become pathologically slow if you change the order of -tables in a @code{SELECT}. In the benchmark suite, a time more than -15,000 times slower than MySQL Server was seen. This is due to @code{mSQL}'s -lack of a join optimiser to order tables in the optimal order. -However, if you put the tables in exactly the right order in -@code{mSQL}2 and the @code{WHERE} is simple and uses index columns, -the join will be relatively fast! -@xref{MySQL Benchmarks}. - -@item -@code{ORDER BY} and @code{GROUP BY}. - -@item -@code{DISTINCT}. - -@item -Using @code{TEXT} or @code{BLOB} columns. -@end itemize - -@item SQL Features - -@itemize @bullet -@item @code{GROUP BY} and @code{HAVING}. -@code{mSQL} does not support @code{GROUP BY} at all. -MySQL Server supports a full @code{GROUP BY} with both @code{HAVING} and -the following functions: @code{COUNT()}, @code{AVG()}, @code{MIN()}, -@code{MAX()}, @code{SUM()}, and @code{STD()}. @code{COUNT(*)} is -optimised to return very quickly if the @code{SELECT} retrieves from -one table, no other columns are retrieved, and there is no -@code{WHERE} clause. @code{MIN()} and @code{MAX()} may take string -arguments. - -@item @code{INSERT} and @code{UPDATE} with calculations. -MySQL Server can do calculations in an @code{INSERT} or @code{UPDATE}. -For example: - -@example -mysql> UPDATE SET x=x*10+y WHERE x<20; -@end example - -@item Aliasing. -MySQL Server has column aliasing. - -@item Qualifying column names. -In MySQL Server, if a column name is unique among the tables used in a -query, you do not have to use the full qualifier. - -@item @code{SELECT} with functions. -MySQL Server has many functions (too many to list here; see @ref{Functions}). - -@end itemize - -@item Disk Space Efficiency -That is, how small can you make your tables? - -MySQL Server has very precise types, so you can create tables that take -very little space. An example of a useful MySQL datatype is the -@code{MEDIUMINT} that is 3 bytes long. If you have 100 million -records, saving even 1 byte per record is very important. - -@code{mSQL2} has a more limited set of column types, so it is -more difficult to get small tables. - -@item Stability -This is harder to judge objectively. For a discussion of MySQL Server -stability, see @ref{Stability}. - -We have no experience with @code{mSQL} stability, so we cannot say -anything about that. - -@item Price -Another important issue is the license. MySQL Server has a -more flexible license than @code{mSQL}, and is also less expensive -than @code{mSQL}. Whichever product you choose to use, remember to -at least consider paying for a license or e-mail support. - -@item Perl Interfaces -MySQL Server has basically the same interfaces to Perl as @code{mSQL} with -some added features. - -@item JDBC (Java) -MySQL Server currently has a lot of different JDBC drivers: - -@itemize @bullet -@item -The mm driver: a type 4 JDBC driver by Mark Matthews -@email{mmatthew@@ecn.purdue.edu}. This is released under the LGPL. - -@item -The Resin driver: this is a commercial JDBC driver released under open -source. @uref{http://www.caucho.com/projects/jdbc-mysql/index.xtp} - -@item -The gwe driver: a Java interface by GWE technologies (not supported anymore). - -@item -The jms driver: an improved gwe driver by Xiaokun Kelvin ZHU -@email{X.Zhu@@brad.ac.uk} (not supported anymore). - -@item -The twz driver: a type 4 JDBC driver by Terrence W. Zellers -@email{zellert@@voicenet.com}. This is commercial but is free for private -and educational use (not supported anymore). -@end itemize - -The recommended driver is the mm driver. The Resin driver may also be -good (at least the benchmarks look good), but we haven't received that -much information about this yet. - -We know that @code{mSQL} has a JDBC driver, but we have too little -experience with it to compare. - -@item Rate of Development -MySQL Server has a small core team of developers, but we are quite -used to coding C and C++ very rapidly. Because threads, functions, -@code{GROUP BY}, and so on are still not implemented in @code{mSQL}, it -has a lot of catching up to do. To get some perspective on this, you -can view the @code{mSQL} @file{HISTORY} file for the last year and -compare it with the News section of the MySQL Reference Manual -(@pxref{News}). It should be pretty obvious which one has developed -most rapidly. - -@item Utility Programs -Both @code{mSQL} and MySQL Server have many interesting third-party -tools. Because it is very easy to port upward (from @code{mSQL} to -MySQL Server), almost all the interesting applications that are available for -@code{mSQL} are also available for MySQL Server. - -MySQL Server comes with a simple @code{msql2mysql} program that fixes -differences in spelling between @code{mSQL} and MySQL Server for the -most-used C API functions. -For example, it changes instances of @code{msqlConnect()} to -@code{mysql_connect()}. Converting a client program from @code{mSQL} to -MySQL Server usually requires only minor effort. -@end table - -@menu -* Using mSQL tools:: How to convert @code{mSQL} tools for MySQL -* Protocol differences:: How @code{mSQL} and MySQL Client/Server Communications Protocols Differ -* Syntax differences:: How @code{mSQL} 2.0 SQL Syntax Differs from MySQL -@end menu - - -@node Using mSQL tools, Protocol differences, Compare mSQL, Compare mSQL -@subsubsection How to Convert @code{mSQL} Tools for MySQL - -@cindex MySQL tools, conversion -@cindex converting, tools -@cindex tools, converting - -According to our experience, it doesn't take long to convert tools -such as @code{msql-tcl} and @code{msqljava} that use the -@code{mSQL} C API so that they work with the MySQL C API. - -The conversion procedure is: - -@enumerate -@item -Run the shell script @code{msql2mysql} on the source. This requires -the @code{replace} program, which is distributed with MySQL Server. - -@item -Compile. - -@item -Fix all compiler errors. -@end enumerate - -Differences between the @code{mSQL} C API and the MySQL C API are: - -@itemize @bullet -@item -MySQL Server uses a @code{MYSQL} structure as a connection type (@code{mSQL} -uses an @code{int}). - -@item -@code{mysql_connect()} takes a pointer to a @code{MYSQL} structure as a -parameter. It is easy to define one globally or to use @code{malloc()} -to get one. @code{mysql_connect()} also takes two parameters for -specifying the user and password. You may set these to -@code{NULL, NULL} for default use. - -@item -@code{mysql_error()} takes the @code{MYSQL} structure as a parameter. -Just add the parameter to your old @code{msql_error()} code if you are -porting old code. - -@item -MySQL Server returns an error number and a text error message for all -errors. @code{mSQL} returns only a text error message. - -@item -Some incompatibilities exist as a result of MySQL Server supporting -multiple connections to the server from the same process. -@end itemize - - -@node Protocol differences, Syntax differences, Using mSQL tools, Compare mSQL -@subsubsection How @code{mSQL} and MySQL Client/Server Communications Protocols Differ - -@cindex communications protocols -@cindex mSQL vs. MySQL, protocol - -There are enough differences that it is impossible -(or at least not easy) to support both. - -The most significant ways in which the MySQL protocol differs -from the @code{mSQL} protocol are listed here: - -@itemize @bullet -@item -A message buffer may contain many result rows. - -@item -The message buffers are dynamically enlarged if the query or the -result is bigger than the current buffer, up to a configurable server -and client limit. - -@item -All packets are numbered to catch duplicated or missing packets. - -@item -All column values are sent in ASCII. The lengths of columns and rows -are sent in packed binary coding (1, 2, or 3 bytes). - -@item -MySQL can read in the result unbuffered (without having to store the -full set in the client). - -@item -If a single read/write takes more than 30 seconds, the server closes -the connection. - -@item -If a connection is idle for 8 hours, the server closes the connection. -@end itemize - - -@node Syntax differences, , Protocol differences, Compare mSQL -@subsubsection How @code{mSQL} 2.0 SQL Syntax Differs from MySQL - -@noindent -@strong{Column types} - -@table @code -@item MySQL Server -Has the following additional types (among others; -@pxref{CREATE TABLE, , @code{CREATE TABLE}}): -@itemize @bullet -@item -@c FIX bad lingo, needs rephrasing -@code{ENUM} type for one of a set of strings. -@item -@c FIX bad lingo, needs rephrasing -@code{SET} type for many of a set of strings. -@item -@code{BIGINT} type for 64-bit integers. -@end itemize -@item -MySQL Server also supports -the following additional type attributes: -@itemize @bullet -@item -@code{UNSIGNED} option for integer and floating-point columns. -@item -@code{ZEROFILL} option for integer columns. -@item -@code{AUTO_INCREMENT} option for integer columns that are a -@code{PRIMARY KEY}. -@xref{mysql_insert_id, , @code{mysql_insert_id()}}. -@item -@code{DEFAULT} value for all columns. -@end itemize -@item mSQL2 -@code{mSQL} column types correspond to the MySQL types shown in the following table: -@multitable @columnfractions .15 .70 -@item @code{mSQL} @strong{type} @tab @strong{Corresponding MySQL type} -@item @code{CHAR(len)} @tab @code{CHAR(len)} -@item @code{TEXT(len)} @tab @code{TEXT(len)}. @code{len} is the maximal length. -And @code{LIKE} works. -@item @code{INT} @tab @code{INT}. With many more options! -@item @code{REAL} @tab @code{REAL}. Or @code{FLOAT}. Both 4- and 8-byte versions are available. -@item @code{UINT} @tab @code{INT UNSIGNED} -@item @code{DATE} @tab @code{DATE}. Uses ANSI SQL format rather than @code{mSQL}'s own format. -@item @code{TIME} @tab @code{TIME} -@item @code{MONEY} @tab @code{DECIMAL(12,2)}. A fixed-point value with two decimals. -@end multitable -@end table - -@noindent -@strong{Index Creation} - -@table @code -@item MySQL Server -Indexes may be specified at table creation time with the @code{CREATE TABLE} -statement. -@item mSQL -Indexes must be created after the table has been created, with separate -@code{CREATE INDEX} statements. -@end table - -@noindent -@strong{To Insert a Unique Identifier into a Table} - -@table @code -@item MySQL Server -Use @code{AUTO_INCREMENT} as a column type -specifier. -@xref{mysql_insert_id, , @code{mysql_insert_id()}}. -@item mSQL -Create a @code{SEQUENCE} on a table and select the @code{_seq} column. -@end table - -@noindent -@strong{To Obtain a Unique Identifier for a Row} - -@table @code -@item MySQL Server -Add a @code{PRIMARY KEY} or @code{UNIQUE} key to the table and use this. -New in Version 3.23.11: If the @code{PRIMARY} or @code{UNIQUE} key consists of only one -column and this is of type integer, one can also refer to it as -@code{_rowid}. -@item mSQL -Use the @code{_rowid} column. Observe that @code{_rowid} may change over time -depending on many factors. -@end table - -@noindent -@strong{To Get the Time a Column Was Last Modified} - -@table @code -@item MySQL Server -Add a @code{TIMESTAMP} column to the table. This column is automatically set -to the current date and time for @code{INSERT} or @code{UPDATE} statements if -you don't give the column a value or if you give it a @code{NULL} value. - -@item mSQL -Use the @code{_timestamp} column. -@end table - -@noindent -@strong{@code{NULL} Value Comparisons} - -@table @code -@item MySQL Server -MySQL Server follows -ANSI SQL, and a comparison with @code{NULL} is always @code{NULL}. -@item mSQL -In @code{mSQL}, @code{NULL = NULL} is TRUE. You -must change @code{=NULL} to @code{IS NULL} and @code{<>NULL} to -@code{IS NOT NULL} when porting old code from @code{mSQL} to MySQL Server. -@end table - -@noindent -@strong{String Comparisons} - -@table @code -@item MySQL Server -Normally, string comparisons are performed in case-independent fashion with -the sort order determined by the current character set (ISO-8859-1 Latin1 by -default). If you don't like this, declare your columns with the -@code{BINARY} attribute, which causes comparisons to be done according to the -ASCII order used on the MySQL server host. -@item mSQL -All string comparisons are performed in case-sensitive fashion with -sorting in ASCII order. -@end table - -@noindent -@strong{Case-insensitive Searching} - -@table @code -@item MySQL Server -@code{LIKE} is a case-insensitive or case-sensitive operator, depending on -the columns involved. If possible, MySQL uses indexes if the -@code{LIKE} argument doesn't start with a wildcard character. -@item mSQL -Use @code{CLIKE}. -@end table - -@noindent -@strong{Handling of Trailing Spaces} - -@table @code -@item MySQL Server -Strips all spaces at the end of @code{CHAR} and @code{VARCHAR} -columns. Use a @code{TEXT} column if this behaviour is not desired. -@item mSQL -Retains trailing space. -@end table - -@noindent -@strong{@code{WHERE} Clauses} - -@table @code -@item MySQL Server -MySQL correctly prioritises everything (@code{AND} is evaluated -before @code{OR}). To get @code{mSQL} behaviour in MySQL Server, use -parentheses (as shown in an example later in this section). -@item mSQL -Evaluates everything from left to right. This means that some logical -calculations with more than three arguments cannot be expressed in any -way. It also means you must change some queries when you upgrade to -MySQL Server. You do this easily by adding parentheses. Suppose you -have the following @code{mSQL} query: -@example -mysql> SELECT * FROM table WHERE a=1 AND b=2 OR a=3 AND b=4; -@end example -To make MySQL Server evaluate this the way that @code{mSQL} would, -you must add parentheses: -@example -mysql> SELECT * FROM table WHERE (a=1 AND (b=2 OR (a=3 AND (b=4)))); -@end example -@end table - -@noindent -@strong{Access Control} - -@table @code -@item MySQL Server -Has tables to store grant (permission) options per user, host, and -database. @xref{Privileges}. -@item mSQL -Has a file @file{mSQL.acl} in which you can grant read/write privileges for -users. -@end table - - -@node Compare PostgreSQL, , Compare mSQL, Comparisons -@subsection How MySQL Compares to @code{PostgreSQL} - -@cindex PostgreSQL vs. MySQL, overview - -When reading the following, please note that both products are continually -evolving. We at MySQL AB and the PostgreSQL developers are both working -on making our respective databases as good as possible, so we are both a -serious alternative to any commercial database. - -The following comparison is made by us at MySQL AB. We have tried to be -as accurate and fair as possible, but although we know MySQL Server thoroughly, -we don't have a full knowledge of all PostgreSQL features, so we may have -got some things wrong. We will, however, correct these when they come to our -attention. - -We would first like to note that PostgreSQL and MySQL Server are both widely used -products, but with different design goals, even if we are both striving -toward ANSI SQL compliancy. This means that for some applications MySQL Server -is more suited, while for others PostgreSQL is more suited. When choosing -which database to use, you should first check if the database's feature set -satisfies your application. If you need raw speed, MySQL Server is probably your -best choice. If you need some of the extra features that only PostgreSQL -can offer, you should use @code{PostgreSQL}. - -@menu -* MySQL-PostgreSQL goals:: MySQL and PostgreSQL development strategies -* MySQL-PostgreSQL features:: Featurewise Comparison of MySQL and PostgreSQL -* MySQL-PostgreSQL benchmarks:: Benchmarking MySQL and PostgreSQL -@end menu - - -@node MySQL-PostgreSQL goals, MySQL-PostgreSQL features, Compare PostgreSQL, Compare PostgreSQL -@subsubsection MySQL and PostgreSQL development strategies - -@cindex PostgreSQL vs. MySQL, strategies -When adding things to MySQL Server we take pride to do an optimal, definite -solution. The code should be so good that we shouldn't have any need to -change it in the foreseeable future. We also do not like to sacrifice -speed for features but instead will do our utmost to find a solution -that will give maximal throughput. This means that development will take -a little longer, but the end result will be well worth this. This kind -of development is only possible because all server code are checked by -one of a few (currently two) persons before it's included in the -MySQL server. - -We at MySQL AB believe in frequent releases to be able to push out new -features quickly to our users. Because of this we do a new small release -about every three weeks, and a major branch every year. All releases are -thoroughly tested with our testing tools on a lot of different platforms. - -PostgreSQL is based on a kernel with lots of contributors. In this setup -it makes sense to prioritise adding a lot of new features, instead of -implementing them optimally, because one can always optimise things -later if there arises a need for this. - -Another big difference between MySQL Server and PostgreSQL is that -nearly all of the code in the MySQL server is coded by developers that -are employed by MySQL AB and are still working on the server code. The -exceptions are the transaction engines and the regexp library. - -This is in sharp contrast to the PostgreSQL code, the majority of -which is coded by a big group of people with different backgrounds. -It was only recently that the PostgreSQL developers announced that their -current developer group had finally had time to take a look at all -the code in the current PostgreSQL release. - -Both of the aforementioned development methods have their own merits and drawbacks. -We here at MySQL AB think, of course, that our model is better because our -model gives better code consistency, more optimal and reusable code, and -in our opinion, fewer bugs. Because we are the authors of the MySQL server -code, we are better able to coordinate new features and releases. - - -@node MySQL-PostgreSQL features, MySQL-PostgreSQL benchmarks, MySQL-PostgreSQL goals, Compare PostgreSQL -@subsubsection Featurewise Comparison of MySQL and PostgreSQL - -@cindex PostgreSQL vs. MySQL, features - -On the @code{crash-me} page -(@uref{http://www.mysql.com/information/crash-me.php}) -you can find a list of those database constructs and limits that -one can detect automatically with a program. Note, however, that a lot of -the numerical limits may be changed with startup options for their respective -databases. This web page is, however, extremely useful when you want to -ensure that your applications work with many different databases or -when you want to convert your application from one database to another. - -MySQL Server offers the following advantages over PostgreSQL: - -@itemize @bullet -@item -@code{MySQL} Server is generally much faster than PostgreSQL. MySQL -4.0.1 also has a query cache that can boost up the query speed for -mostly-read-only sites many times. - -@item -MySQL has a much larger user base than PostgreSQL. Therefore, the code is -tested more and has historically proven more stable than PostgreSQL. -MySQL Server is used more in production environments than PostgreSQL, -mostly thanks to the fact that MySQL AB, formerly TCX DataKonsult AB, has -provided top-quality commercial support for MySQL Server from the day it -was released, whereas until recently PostgreSQL was unsupported. - -@item -MySQL Server works better on Windows than PostgreSQL does. MySQL Server -runs as a native Windows application (a service on NT/2000/XP), -while PostgreSQL is run under the @code{Cygwin} emulation. We have -heard that PostgreSQL is not yet that stable on Windows but we haven't -been able to verify this ourselves. - -@item -MySQL has more APIs to other languages and is supported by more -existing programs than PostgreSQL. @xref{Contrib}. - -@item -MySQL Server works on 24/7 heavy-duty systems. In most circumstances -you never have to run any cleanups on MySQL Server. PostgreSQL doesn't -yet support 24/7 systems because you have to run @code{VACUUM} -once in a while to reclaim space from @code{UPDATE} and @code{DELETE} -commands and to perform statistics analyses that are critical to get -good performance with PostgreSQL. @code{VACUUM} is also needed after -adding a lot of new rows to a table. On a busy system with lots of changes, -@code{VACUUM} must be run very frequently, in the worst cases even -many times a day. During the @code{VACUUM} run, which may take hours -if the database is big, the database is, from a production standpoint, -practically dead. Please note: in PostgreSQL version 7.2, basic vacuuming -no longer locks tables, thus allowing normal user access during the vacuum. -A new @code{VACUUM FULL} command does old-style vacuum by locking the table -and shrinking the on-disk copy of the table. - -@item -MySQL replication has been thoroughly tested, and is used by sites like: -@itemize @minus -@item Yahoo Finance (@uref{http://finance.yahoo.com/}) -@item Mobile.de (@uref{http://www.mobile.de/}) -@item Slashdot (@uref{http://www.slashdot.org/}) -@end itemize - -@item -Included in the MySQL distribution are two different testing suites, -@file{mysql-test-run} and @code{crash-me} -(@uref{http://www.mysql.com/information/crash-me.php}), as well -as a benchmark suite. The test system is actively updated with code to -test each new feature and almost all reproduceable bugs that have come to -our attention. We test MySQL Server with these on a lot of platforms before -every release. These tests are more sophisticated than anything we have -seen from PostgreSQL, and they ensure that the MySQL Server is kept to a high -standard. - -@item -There are far more books in print about MySQL Server than about PostgreSQL. -O'Reilly, SAMS, Que, and New Riders are all major publishers with books -about MySQL. All MySQL features are also documented in the MySQL online -manual because when a new feature is implemented, the MySQL developers -are required to document it before it's included in the source. - -@item -MySQL Server supports more of the standard ODBC functions than @code{PostgreSQL}. - -@item -MySQL Server has a much more sophisticated @code{ALTER TABLE}. - -@item -MySQL Server has support for tables without transactions for applications that -need all the speed they can get. The tables may be memory-based, @code{HEAP} -tables or disk based @code{MyISAM}. @xref{Table types}. - -@item -MySQL Server has support for two different table handlers that support -transactions, @code{InnoDB}, and @code{BerkeleyDB}. Because every -transaction engine performs differently under different conditions, this -gives the application writer more options to find an optimal solution for -his or her setup, if need be per individual table. @xref{Table types}. - -@item -@code{MERGE} tables gives you a unique way to instantly make a view over -a set of identical tables and use these as one. This is perfect for -systems where you have log files that you order, for example, by month. -@xref{MERGE}. - -@item -The option to compress read-only tables, but still have direct access to -the rows in the table, gives you better performance by minimising disk -reads. This is very useful when you are archiving things. -@xref{myisampack, , @code{myisampack}}. - -@item -MySQL Server has internal support for full-text search. @xref{Fulltext Search}. - -@item -You can access many databases from the same connection (depending, of course, -on your privileges). - -@item -MySQL Server is coded from the start to be multi-threaded, while -PostgreSQL uses processes. Context switching and access to common -storage areas is much faster between threads than between separate -processes. This gives MySQL Server a big speed advantage in multi-user -applications and also makes it easier for MySQL Server to take full -advantage of symmetric multiprocessor (SMP) systems. - -@item -MySQL Server has a much more sophisticated privilege system than -PostgreSQL. While PostgreSQL only supports @code{INSERT}, -@code{SELECT}, and @code{UPDATE/DELETE} grants per user on a database or -a table, MySQL Server allows you to define a full set of different -privileges on the database, table, and column level. MySQL Server also -allows you to specify the privilege on host and user combinations. -@xref{GRANT}. - -@item -MySQL Server supports a compressed client/server protocol which improves -performance over slow links. - -@item -MySQL Server employs a ``table handler'' concept, and is the only relational -database we know of built around this concept. This allows different -low-level table types to be called from the SQL engine, and each table -type can be optimised for different performance characteristics. - -@item -All MySQL table types (except @code{InnoDB}) are implemented as files -(one table per file), which makes it really easy to back up, move, delete, -and even symlink databases and tables, even when the server is down. - -@item -Tools to repair and optimise @code{MyISAM} tables (the most common -MySQL table type). A repair tool is only needed when a physical corruption -of a datafile happens, usually from a hardware failure. It allows a -majority of the data to be recovered. - -@item -Upgrading MySQL Server is painless. When you are upgrading MySQL -Server, you don't need to dump/restore your data, as you have to do with -most PostgreSQL upgrades. -@end itemize - -Drawbacks with MySQL Server compared to PostgreSQL: - -@itemize @bullet -@item -The transaction support in MySQL Server is not yet as well tested as -PostgreSQL's system. - -@item -Because MySQL Server uses threads, which are not yet flawless on many OSes, one -must either use binaries from @uref{http://www.mysql.com/downloads/}, or -carefully follow our instructions on -@uref{http://www.mysql.com/doc/I/n/Installing_source.html} to get an -optimal binary that works in all cases. - -@item -Table locking, as used by the non-transactional @code{MyISAM} tables, is -in many cases faster than page locks, row locks, or versioning. The -drawback, however, is that if one doesn't take into account how table -locks work, a single long-running query can block a table for updates -for a long time. This can usually be avoided when designing the -application. If not, one can always switch the trouble table to use one -of the transactional table types. @xref{Table locking}. - -@item -With UDF (user-defined functions) one can extend MySQL Server with both normal -SQL functions and aggregates, but this is not yet as easy or as flexible -as in PostgreSQL. @xref{Adding functions}. - -@item -Updates that run over multiple tables are harder to do in MySQL Server. -This will, however, be fixed in MySQL Server 4.0.2 with multi-table -@code{UPDATE} and in MySQL Server 4.1 with subselects. In MySQL Server -4.0 one can use multi-table deletes to delete from many tables at the -same time. @xref{DELETE}. -@end itemize - -PostgreSQL currently offers the following advantages over MySQL Server: - -Note that because we know the MySQL road map, we have included in the -following table the version when MySQL Server should support this feature. -Unfortunately we couldn't do this for previous comparisons, because we -don't know the PostgreSQL roadmap. - -@multitable @columnfractions .30 .30 -@item @strong{Feature} @tab @strong{MySQL version} -@item Subselects @tab 4.1 -@item Foreign keys @tab 4.1 (3.23 with InnoDB) -@item Views @tab 5.0 -@item Stored procedures @tab 5.0 -@item Triggers @tab 5.0 -@item Unions @tab 4.0 -@item Full join @tab 4.1 -@item Constraints @tab 4.1 or 5.0 -@item Cursors @tab 4.1 or 5.0 -@item R-trees @tab 4.1 (for MyISAM tables) -@item Inherited tables @tab Not planned -@item Extensible type system @tab Not planned -@end multitable - -Other reasons someone may consider using PostgreSQL: - -@itemize @bullet -@item -Standard usage in PostgreSQL is closer to ANSI SQL in some cases. - -@item -One can speed up PostgreSQL by coding things as stored procedures. - -@item -For geographical data, R-trees make PostgreSQL better than MySQL Server. -(note: MySQL version 4.1 will have R-trees for MyISAM tables). - -@item -The PostgreSQL optimiser can do some optimisation that the current MySQL -optimiser can't do. Most notable is doing joins when you don't have the -proper keys in place and doing a join where you are using different keys -combined with OR. The MySQL benchmark suite at -@uref{http://www.mysql.com/information/benchmarks.html} shows you what -kind of constructs you should watch out for when using different -databases. - -@item -PostgreSQL has a bigger team of developers that contribute to the server. -@end itemize - -Drawbacks with PostgreSQL compared to MySQL Server: - -@itemize @bullet -@item -@code{VACUUM} makes PostgreSQL hard to use in a 24/7 environment. - -@item -Only transactional tables. - -@item -Much slower @code{INSERT}, @code{DELETE}, and @code{UPDATE}. -@end itemize - -For a complete list of drawbacks, you should also examine the first table -in this section. - - -@node MySQL-PostgreSQL benchmarks, , MySQL-PostgreSQL features, Compare PostgreSQL -@subsubsection Benchmarking MySQL and PostgreSQL - -@cindex PostgreSQL vs. MySQL, benchmarks - -The only @code{Open Source} benchmark that we know of that can be used to -benchmark MySQL Server and PostgreSQL (and other databases) is our own. It can -be found at @uref{http://www.mysql.com/information/benchmarks.html}. - -We have many times asked the PostgreSQL developers and some PostgreSQL -users to help us extend this benchmark to make it the definitive benchmark -for databases, but unfortunately we haven't gotten any feedback for this. - -We, the MySQL developers, have, because of this, spent a lot of hours to get -maximum performance from PostgreSQL for the benchmarks, but because we -don't know PostgreSQL intimately, we are sure that there are things that -we have missed. We have on the benchmark page documented exactly how we -did run the benchmark so that it should be easy for anyone to repeat and -verify our results. - -The benchmarks are usually run with and without the @code{--fast} option. -When run with @code{--fast} we are trying to use every trick the server can -do to get the code to execute as fast as possible. The idea is that the -normal run should show how the server would work in a default setup and -the @code{--fast} run shows how the server would do if the application -developer would use extensions in the server to make his application run -faster. - -When running with PostgreSQL and @code{--fast} we do a @code{VACUUM} -after every major table @code{UPDATE} and @code{DROP TABLE} to make the -database in perfect shape for the following @code{SELECT}s. The time for -@code{VACUUM} is measured separately. - -When running with PostgreSQL 7.1.1 we could, however, not run with -@code{--fast} because during the @code{INSERT} test, the postmaster (the -PostgreSQL deamon) died and the database was so corrupted that it was -impossible to restart postmaster. After this happened twice, we decided -to postpone the @code{--fast} test until the next PostgreSQL release. The -details about the machine we run the benchmark on can be found on the -benchmark page. - -Before going to the other benchmarks we know of, we would like to give -some background on benchmarks. - -It's very easy to write a test that shows @strong{any} database to be the best -database in the world, by just restricting the test to something the -database is very good at and not testing anything that the database is -not good at. If one, after doing this, summarises the result as -a single figure, things are even easier. - -This would be like us measuring the speed of MySQL Server compared to PostgreSQL -by looking at the summary time of the MySQL benchmarks on our web page. -Based on this MySQL Server would be more than 40 times faster than PostgreSQL, -something that is, of course, not true. We could make things even worse -by just taking the test where PostgreSQL performs worst and claim that -MySQL Server is more than 2000 times faster than PostgreSQL. - -The case is that MySQL does a lot of optimisations that PostgreSQL -doesn't do. This is, of course, also true the other way around. An SQL -optimiser is a very complex thing, and a company could spend years -just making the optimiser faster and faster. - -When looking at the benchmark results you should look for things that -you do in your application and just use these results to decide which -database would be best suited for your application. The benchmark -results also show things a particular database is not good at and should -give you a notion about things to avoid and what you may have to do in -other ways. - -We know of two benchmark tests that claim that PostgreSQL performs better -than MySQL Server. These both where multi-user tests, a test that we here at -MySQL AB haven't had time to write and include in the benchmark suite, -mainly because it's a big task to do this in a manner that is fair to -all databases. - -One is the benchmark paid for by Great Bridge, the company that for 16 months -attempted to build a business based on PostgreSQL but now has ceased -operations. This is probably the worst benchmark we have ever seen anyone -conduct. This was not only tuned to only test what PostgreSQL is absolutely -best at, but it was also totally unfair to every other database involved in -the test. - -@strong{Note}: We know that even some of the main PostgreSQL -developers did not like the way Great Bridge conducted the benchmark, so we -don't blame the PostgreSQL team for the way the benchmark was done. - -This benchmark has been condemned in a lot of postings and newsgroups, so -here we will just briefly repeat some things that were wrong with it. - -@itemize @bullet -@item -The tests were run with an expensive commercial tool that makes it -impossible for an @code{Open Source} company like us to verify the benchmarks, -or even check how the benchmarks were really done. The tool is not even -a true benchmark tool, but an application/setup testing tool. To refer -to this as a ``standard'' benchmark tool is to stretch the truth a long way. - -@item -Great Bridge admitted that they had optimised the PostgreSQL database -(with @code{VACUUM} before the test) and tuned the startup for the tests, -something they hadn't done for any of the other databases involved. They -say ``This process optimises indexes and frees up disk space a bit. The -optimised indexes boost performance by some margin.'' Our benchmarks -clearly indicate that the difference in running a lot of selects on a -database with and without @code{VACUUM} can easily differ by a factor -of 10. - -@item -The test results were also strange. The AS3AP test documentation -mentions that the test does ``selections, simple joins, projections, -aggregates, one-tuple updates, and bulk updates.'' - -PostgreSQL is good at doing @code{SELECT}s and @code{JOIN}s (especially -after a @code{VACUUM}), but doesn't perform as well on @code{INSERT}s or -@code{UPDATE}s. The benchmarks seem to indicate that only @code{SELECT}s -were done (or very few updates). This could easily explain the good results -for PostgreSQL in this test. The bad results for MySQL will be obvious a -bit down in this document. - -@item -They did run the so-called benchmark from a Windows machine against a -Linux machine over ODBC, a setup that no normal database user would ever -do when running a heavy multi-user application. This tested more the -ODBC driver and the Windows protocol used between the clients than the -database itself. - -@item -When running the database against Oracle and MS-SQL (Great Bridge has -indirectly indicated the databases they used in the test), they -didn't use the native protocol but instead ODBC. Anyone that has ever -used Oracle knows that all real applications use the native interface -instead of ODBC. Doing a test through ODBC and claiming that the results -had anything to do with using the database in a real-world situation can't -be regarded as fair. They should have done two tests with and without ODBC -to provide the right facts (after having gotten experts to tune all involved -databases, of course). - -@item -They refer to the TPC-C tests, but they don't mention anywhere that the -test they did was not a true TPC-C test and they were not even allowed to -call it a TPC-C test. A TPC-C test can only be conducted by the rules -approved by the TPC Council (@uref{http://www.tpc.org/}). Great Bridge -didn't do that. By doing this they have both violated the TPC trademark -and miscredited their own benchmarks. The rules set by the TPC Council -are very strict to ensure that no one can produce false results or make -unprovable statements. Apparently Great Bridge wasn't interested in -doing this. - -@item -After the first test, we contacted Great Bridge and mentioned to them -some of the obvious mistakes they had done with MySQL Server: - -@itemize @minus -@item -Running with a debug version of our ODBC driver - -@item -Running on a Linux system that wasn't optimised for threads - -@item -Using an old MySQL version when there was a recommended newer one available - -@item -Not starting MySQL Server with the right options for heavy multi-user use (the -default installation of MySQL Server is tuned for minimal resource use) -@end itemize - -Great Bridge did run a new test, with our optimised ODBC driver and with -better startup options for MySQL Server, but refused to either use our updated -glibc library or our standard binary (used by 80% of our users), which was -statically linked with a fixed glibc library. - -According to what we know, Great Bridge did nothing to ensure that the -other databases were set up correctly to run well in their test -environment. We are sure, however, that they didn't contact Oracle or -Microsoft to ask for their advice in this matter. ;) - -@item -The benchmark was paid for by Great Bridge, and they decided to publish -only partial, chosen results (instead of publishing it all). -@end itemize - -Tim Perdue, a long-time PostgreSQL fan and a reluctant MySQL user, -published a comparison on PHPbuilder -(@uref{http://www.phpbuilder.com/columns/tim20001112.php3}). - -When we became aware of the comparison, we phoned Tim Perdue about this -because there were a lot of strange things in his results. For example, -he claimed that MySQL Server had a problem with five users in his tests, when we -know that there are users with similar machines as his that are using -MySQL Server with 2000 simultaneous connections doing 400 queries per second. -(In this case the limit was the web bandwidth, not the database.) - -It sounded like he was using a Linux kernel that either had some -problems with many threads, such as kernels before 2.4, which had a problem -with many threads on multi-CPU machines. We have documented in this manual -how to fix this and Tim should be aware of this problem. - -The other possible problem could have been an old glibc library and -that Tim didn't use a MySQL binary from our site, which is linked with -a corrected glibc library, but had compiled a version of his own. -In any of these cases, the symptom would have been exactly what Tim -had measured. - -We asked Tim if we could get access to his data so that we could repeat -the benchmark and if he could check the MySQL version on the machine to -find out what was wrong and he promised to come back to us about this. -He has not done that yet. - -Because of this we can't put any trust in this benchmark either. :( - -Over time things also change and the preceding benchmarks are not that -relevant anymore. MySQL Server now has a couple of different table handlers -with different speed/concurrency tradeoffs. @xref{Table types}. It -would be interesting to see how the above tests would run with the -different transactional table types in MySQL Server. PostgreSQL -has, of course, -also got new features since the test was made. As these tests are -not publicly available there is no way for us to know how the -database would perform in the same tests today. - - -Conclusion: - -The only benchmarks that exist today that anyone can download and run -against MySQL Server and PostgreSQL are the MySQL benchmarks. -We here at MySQL AB -believe that @code{Open Source} databases should be tested with @code{Open Source} tools! -This is the only way to ensure that no one does tests that nobody can -reproduce and use this to claim that one database is better than another. -Without knowing all the facts it's impossible to answer the claims of the -tester. - -The thing we find strange is that every test we have seen about -PostgreSQL, that is impossible to reproduce, claims that PostgreSQL is -better in most cases while our tests, which anyone can reproduce, -clearly show otherwise. With this we don't want to say that PostgreSQL -isn't good at many things (it is!) or that it isn't faster than MySQL Server -under certain conditions. We would just like to see a fair test where -PostgreSQL performs very well, so that we could get some friendly -competition going! - -For more information about our benchmark suite, see @ref{MySQL Benchmarks}. - -We are working on an even better benchmark suite, including multi-user -tests, and a better documentation of what the individual tests really -do and how to add more tests to the suite. - - -@node Installing, Tutorial, Introduction, Top -@chapter MySQL Installation - -@cindex installing, overview - -@menu -* Quick Standard Installation:: Quick Standard Installation of MySQL -* General Installation Issues:: General Installation Issues -* Installing source:: Installing a MySQL source distribution -* Post-installation:: Post-installation setup and testing -* Upgrade:: Upgrading/Downgrading MySQL -* Operating System Specific Notes:: Operating System Specific Notes -* Perl support:: Perl Installation Comments -@end menu - -This chapter describes how to obtain and install MySQL: - -@itemize @bullet -@item -For a list of sites from which you can obtain MySQL, see -@ref{Getting MySQL, , Getting MySQL}. - -@item -To see which platforms are supported, see @ref{Which OS}. Please note that -not all supported systems are equally good for running MySQL on them. -On some it is much more robust and efficient than others@-see @ref{Which OS} -for details. - -@item -Several versions of MySQL are available in both binary and -source distributions. We also provide public access to our current -source tree for those who want to see our most recent developments and -help us test new code. To determine which version and type of -distribution you should use, see @ref{Which version}. When in doubt, -use the binary distribution. - -@item -Installation instructions for binary and source distributions are described -in @ref{Installing binary}, and @ref{Installing source}. Each set of -instructions includes a section on system-specific problems you may run -into. - -@item -For post-installation procedures, see @ref{Post-installation}. These -procedures apply whether you install MySQL using a binary or -source distribution. -@end itemize - - -@node Quick Standard Installation, General Installation Issues, Installing, Installing -@section Quick Standard Installation of MySQL - -@c This node name is special -@menu -* Linux-RPM:: Installing MySQL on Linux -* Windows installation:: Installing MySQL on Windows -@end menu - - -@node Linux-RPM, Windows installation, Quick Standard Installation, Quick Standard Installation -@subsection Installing MySQL on Linux - -@cindex RPM file -@cindex RedHat Package Manager - -The recommended way to install MySQL on Linux is by using an RPM -file. The MySQL RPMs are currently being built on a RedHat Version -6.2 system but should work on other versions of Linux that support @code{rpm} -and use @code{glibc}. - -If you have problems with an RPM file, for example, if you receive the error -``@code{Sorry, the host 'xxxx' could not be looked up}''@-see -@ref{Binary notes-Linux}. - -The RPM files you may want to use are: - -@itemize @bullet -@item @code{MySQL-VERSION.i386.rpm} - -The MySQL server. You will need this unless you only want to -connect to a MySQL server running on another machine. - -@item @code{MySQL-client-VERSION.i386.rpm} - -The standard MySQL client programs. You probably always want to -install this package. - -@item @code{MySQL-bench-VERSION.i386.rpm} - -Tests and benchmarks. Requires Perl and msql-mysql-modules RPMs. - -@item @code{MySQL-devel-VERSION.i386.rpm} - -Libraries and include files needed if you want to compile other -MySQL clients, such as the Perl modules. - -@item @code{MySQL-VERSION.src.rpm} - -This contains the source code for all of the previous packages. It can also -be used to try to build RPMs for other architectures (for example, Alpha -or SPARC). -@end itemize - -To see all files in an RPM package, run: -@example -shell> rpm -qpl MySQL-VERSION.i386.rpm -@end example - -To perform a standard minimal installation, run: - -@example -shell> rpm -i MySQL-VERSION.i386.rpm MySQL-client-VERSION.i386.rpm -@end example - -To install just the client package, run: - -@example -shell> rpm -i MySQL-client-VERSION.i386.rpm -@end example - -The RPM places data in @file{/var/lib/mysql}. The RPM also creates the -appropriate entries in @file{/etc/rc.d/} to start the server automatically -at boot time. (This means that if you have performed a previous -installation, you may want to make a copy of your previously installed -MySQL startup file if you made any changes to it, so you don't lose -your changes.) - -After installing the RPM file(s), the @code{mysqld} daemon should be running -and you should now be able to start using MySQL. -@xref{Post-installation}. - -If something goes wrong, you can find more information in the binary -installation chapter. @xref{Installing binary}. - - -@node Windows installation, , Linux-RPM, Quick Standard Installation -@subsection Installing MySQL on Windows - -The MySQL server for Windows is available in two distribution types: -@enumerate -@item -The binary distribution contains a setup program which installs -everything you need so that you can start the server immediately. -@item -The source distribution contains all the code and support files -for building the executables using the VC++ 6.0 compiler. -@xref{Windows source build}. -@end enumerate - -Generally speaking, you should use the binary distribution. - -You will need the following: -@itemize @bullet -@item -A 32-bit Windows Operating System such as 9x, Me, NT, 2000, or XP. -The NT family (NT, Windows 2000 and XP) permits running the MySQL server -as a service. @xref{NT start}. - -If you want to use tables bigger than 4G, you should install MySQL -on an NTFS or newer filesystem. Don't forget to use @code{MAX_ROWS} and -@code{AVG_ROW_LENGTH} when you create the table. @xref{CREATE TABLE}. -@item -TCP/IP protocol support. -@item -A copy of the MySQL binary or distribution for Windows, which -can be downloaded from @uref{http://www.mysql.com/downloads/}. - -Note: The distribution files are supplied with a zipped format -and we recommend the use of an adequate FTP client with resume -feature to avoid corruption of files during the download process. -@item -A @code{ZIP} program to unpack the distribution file. -@item -Enough space on the hard drive to unpack, install, and create the -databases in accorandance with your requirements. -@item -If you plan to connect to the MySQL server via @code{ODBC}, you -will also need the @code{MyODBC} driver. @xref{ODBC}. -@end itemize - - -@menu -* Windows binary installation:: Installing the Binaries -* Windows prepare environment:: Preparing the Windows MySQL Environment -* Windows server first start:: Starting the Server for the First Time -@end menu - -@node Windows binary installation, Windows prepare environment, Windows installation, Windows installation -@subsubsection Installing the Binaries - -@enumerate -@item -If you are working on an NT/2000/XP server, logon as a user with -with administrator privileges. -@item -If you are doing an upgrade of an earlier MySQL installation, -it is necessary to stop the server. If you are running the server -as a service, use: - -@example -C:\> NET STOP MySQL -@end example - -Otherwise, use: - -@example -C:\mysql\bin> mysqladmin -u root shutdown -@end example - -@item -On NT/2000/XP machines, if you want to change the server executable -(e.g., -max or -nt), it is also necessary to remove the service: - -@example -C:\mysql\bin> mysqld-max-nt --remove -@end example - -@item -Unzip the distribution file to a temporary directory. -@item -Run the @file{setup.exe} file to begin the installation process. -If you want to install into another directory than the default -@file{c:\mysql}, use the @code{Browse} button to specify your -preferred directory. -@item -Finish the install process. -@end enumerate - - -@node Windows prepare environment, Windows server first start, Windows binary installation, Windows installation -@subsubsection Preparing the Windows MySQL Environment - -Starting with MySQL 3.23.38, the Windows distribution includes -both the normal and the MySQL-Max server binaries. -Here is a list of the different MySQL servers you can use: - -@multitable @columnfractions .20 .80 -@item @strong{Binary} @tab @strong{Description} -@item @code{mysqld} @tab -Compiled with full debugging and automatic memory allocation -checking, symbolic links, InnoDB, and BDB tables. -@item @code{mysqld-opt} @tab -Optimised binary with no support for transactional tables. -@item @code{mysqld-nt} @tab -Optimised binary for NT/2000/XP with support for named pipes. -You can run this version on Windows 9x/Me, but in this case no -named pipes are created and you must have TCP/IP installed. -@item @code{mysqld-max} @tab -Optimised binary with support for symbolic links, -InnoDB and BDB tables. -@item @code{mysqld-max-nt} @tab -Like @code{mysqld-max}, but compiled with support for named pipes. -@end multitable - -Starting from 3.23.50, named pipes are only enabled if one starts mysqld with -@code{--enable-named-pipe}. - -All of the preceding binaries are optimised for the Pentium Pro -processor but should work on any Intel processor >= i386. - -You will need to use an option file to specify your MySQL configuration -under the following circumstances: -@itemize @bullet -@item -The installation or data directories are different from the default -locations (@file{c:\mysql} and @file{c:\mysql\data}). -@item -You want to use one of these servers: -@itemize @bullet -@item mysqld.exe -@item mysqld-max.exe -@item mysqld-max-nt.exe -@end itemize -@item -You need to tune the server settings. -@end itemize - -Normally you can use the @code{WinMySQLAdmin} tool to edit the -option file @code{my.ini}. In this case you don't have to worry -about the following section. - -There are two option files with the same function: @file{my.cnf} and -@file{my.ini}. However, to avoid confusion, it's best if you use only -of one them. Both files are plain text. The @file{my.cnf} file, if used, -should be created in the root directory of the C drive. The @file{my.ini} -file, if used, should be created in the Windows system directory. (This -directory is typically something like @file{C:\WINDOWS} or @file{C:\WINNT}. -You can determine its exact location from the value of the @code{windir} -environment variable.) MySQL looks first for the @code{my.ini} file, -then for the @file{my.cnf} file. - -If your PC uses a boot loader where the C drive isn't the boot drive, -your only option is to use the @file{my.ini} file. Also note that -if you use the @code{WinMySQLAdmin} tool, it uses only the @file{my.ini} -file. The @file{\mysql\bin} directory contains a help file with -instructions for using this tool. - -Using @code{notepad.exe}, create the option file and edit the -@code{[mysqld]} section to specify values for the @code{basedir} and -@code{datadir} parameters: - -@example -[mysqld] -# set basedir to installation path, e.g., c:/mysql -basedir=the_install_path -# set datadir to location of data directory, -# e.g., c:/mysql/data or d:/mydata/data -datadir=the_data_path -@end example - -Note that Windows pathnames should be specified in option files using -forward slashes rather than backslashes. If you do use backslashes, you -must double them. - -If you would like to use a data directory different from the default of -@file{c:\mysql\data}, you must copy the entire contents of the -@file{c:\mysql\data} directory to the new location. - -If you want to use the @code{InnoDB} transactional tables, you -need to manually create two new directories to hold the InnoDB -data and log files@-e.g., @file{c:\ibdata} and @file{c:\iblogs}. -You will also need to add some extra lines to the option -file. @xref{InnoDB start}. - -If you don't want to use @code{InnoDB} tables, add the -@code{skip-innodb} option to the option file. - -Now you are ready to test starting the server. - - -@node Windows server first start, , Windows prepare environment, Windows installation -@subsubsection Starting the Server for the First Time - -Testing from a DOS command prompt is the best thing to do because -the server displays status messages that appear in the DOS window. -If something is wrong with your configuration, these messages will -make it easier for you to identify and fix any problems. - -Make sure you are in the directory where the server is located, then -enter this command: - -@example -C:\mysql\bin> mysqld-max --standalone -@end example - -You should see the following messages as the server starts up: - -@example -InnoDB: The first specified datafile c:\ibdata\ibdata1 did not exist: -InnoDB: a new database to be created! -InnoDB: Setting file c:\ibdata\ibdata1 size to 209715200 -InnoDB: Database physically writes the file full: wait... -InnoDB: Log file c:\iblogs\ib_logfile0 did not exist: new to be created -InnoDB: Setting log file c:\iblogs\ib_logfile0 size to 31457280 -InnoDB: Log file c:\iblogs\ib_logfile1 did not exist: new to be created -InnoDB: Setting log file c:\iblogs\ib_logfile1 size to 31457280 -InnoDB: Log file c:\iblogs\ib_logfile2 did not exist: new to be created -InnoDB: Setting log file c:\iblogs\ib_logfile2 size to 31457280 -InnoDB: Doublewrite buffer not found: creating new -InnoDB: Doublewrite buffer created -InnoDB: creating foreign key constraint system tables -InnoDB: foreign key constraint system tables created -011024 10:58:25 InnoDB: Started -@end example - -For further information about running MySQL on Windows, -see @ref{Windows}. - - -@node General Installation Issues, Installing source, Quick Standard Installation, Installing -@section General Installation Issues - -@c @node Methods of Installation, , , -@c @subsection Methods of Installation - -@c FIX: this needs to be written? - -@menu -* Getting MySQL:: How to Get MySQL -* Which OS:: Operating Systems Supported by MySQL -* Which version:: Which MySQL Version to Use -* Installation layouts:: Installation Layouts -* Many versions:: How and When Updates Are Released -* MySQL binaries:: MySQL Binaries Compiled by MySQL AB -* Installing binary:: Installing a MySQL Binary Distribution -@end menu - - -@node Getting MySQL, Which OS, General Installation Issues, General Installation Issues -@subsection How to Get MySQL - -@cindex downloading -@cindex MySQL version -@cindex version, latest -@cindex getting MySQL -@cindex mirror sites -@cindex URLS for downloading MySQL - -Check the MySQL homepage (@uref{http://www.mysql.com/}) for -information about the current version and for downloading instructions. - -Our main mirror is located at @uref{http://mirrors.sunsite.dk/mysql/}. - -For a complete upto-date list of MySQL web/download mirrors, see -@uref{http://www.mysql.com/downloads/mirrors.html}. -There you will also find information about becoming a MySQL mirror -site and how to report a bad or out-of-date mirror. - - -@node Which OS, Which version, Getting MySQL, General Installation Issues -@subsection Operating Systems Supported by MySQL - -@cindex operating systems, supported -@cindex native thread support -@cindex thread support -@cindex process support -@cindex support, for operating systems - -We use GNU Autoconf, so it is possible to port MySQL to all modern -systems with working Posix threads and a C++ compiler. (To compile only the -client code, a C++ compiler is required but not threads.) We use and develop -the software ourselves primarily on Sun Solaris (Versions 2.5 - 2.7) and -SuSE Linux Version 7.x. - -Note that for many operating systems, the native thread support works only -in the latest versions. MySQL has been reported to compile -successfully on the following operating system/thread package combinations: - -@itemize @bullet -@item -AIX 4.x with native threads. @xref{IBM-AIX}. -@item -Amiga. -@item -BSDI 2.x with the MIT-pthreads package. @xref{BSDI}. -@item -BSDI 3.0, 3.1 and 4.x with native threads. @xref{BSDI}. -@item -DEC Unix 4.x with native threads. @xref{Alpha-DEC-UNIX}. -@item -FreeBSD 2.x with the MIT-pthreads package. @xref{FreeBSD}. -@item -FreeBSD 3.x and 4.x with native threads. @xref{FreeBSD}. -@item -HP-UX 10.20 with the DCE threads or the MIT-pthreads package. -@xref{HP-UX 10.20}. -@item -HP-UX 11.x with the native threads. @xref{HP-UX 11.x}. -@item -Linux 2.0+ with LinuxThreads 0.7.1+ or @code{glibc} 2.0.7+. @xref{Linux}. -@item -Mac OS X Server. @xref{Mac OS X}. -@item -NetBSD 1.3/1.4 Intel and NetBSD 1.3 Alpha (Requires GNU make). @xref{NetBSD}. -@item -OpenBSD > 2.5 with native threads. OpenBSD < 2.5 with the -MIT-pthreads package. @xref{OpenBSD}. -@item -OS/2 Warp 3, FixPack 29 and OS/2 Warp 4, FixPack 4. @xref{OS/2}. -@item -SGI Irix 6.x with native threads. @xref{SGI-Irix}. -@item -Solaris 2.5 and above with native threads on SPARC and x86. @xref{Solaris}. -@item -SunOS 4.x with the MIT-pthreads package. @xref{Solaris}. -@item -Caldera (SCO) OpenServer with a recent port of the FSU Pthreads package. -@xref{Caldera}. -@item -Caldera (SCO) UnixWare 7.0.1. @xref{Caldera Unixware}. -@item -Tru64 Unix -@item -Windows 9x, Me, NT, 2000 and XP. @xref{Windows}. -@end itemize - -Note that not all platforms are suited equally well for running -MySQL. How well a certain platform is suited for a high-load -mission-critical MySQL server is determined by the following -factors: - -@itemize @bullet -@item -General stability of the thread library. A platform may have excellent -reputation otherwise, but if the thread library is unstable in the code -that is called by MySQL, even if everything else is perfect, MySQL will -be only as stable as the thread library. - -@item -The ability of the kernel and/or thread library to take advantage of -@strong{SMP} on multi-processor systems. In other words, when a process -creates a thread, it should be possible for that thread to run on a different -CPU than the original process. - -@item -The ability of the kernel and/or the thread library to run many threads which -acquire/release a mutex over a short critical region frequently without -excessive context switches. In other words, if the implementation of -@code{pthread_mutex_lock()} is too anxious to yield CPU time, this will hurt -MySQL tremendously. If this issue is not taken care of, adding extra CPUs -will actually make MySQL slower. - -@item -General filesystem stability/performance. - -@item -Ability of the filesystem to deal with large files at all and deal with them -efficiently, if your tables are big. - -@item -Our level of expertise here at MySQL AB with the platform. If we know -a platform well, we introduce platform-specific optimisations/fixes enabled at -compile time. We can also provide advice on configuring your system optimally -for MySQL. - -@item -The amount of testing of similar configurations we have done internally. - -@item -The number of users that have successfully run MySQL on that -platform in similar configurations. If this number is high, the chances of -hitting some platform-specific surprises are much smaller. -@end itemize - -Based on the preceding criteria, the best platforms for running -MySQL at this point are x86 with SuSE Linux 7.1, 2.4 kernel, and -ReiserFS (or any similar Linux distribution) and SPARC with Solaris 2.7 -or 2.8. FreeBSD comes third, but we really hope it will join the top -club once the thread library is improved. We also hope that at some -point we will be able to include all other platforms on which -MySQL compiles, runs okay, but not quite with the same level of -stability and performance, into the top category. This will require some -effort on our part in cooperation with the developers of the OS/library -components MySQL depends upon. If you are interested in making -one of those components better, are in a position to influence their -development, and need more detailed instructions on what MySQL -needs to run better, send an e-mail to -@email{internals@@lists.mysql.com}. - -Please note that the preceding comparison is not to say that one OS is better or -worse than the other in general. We are talking about choosing a particular OS -for a dedicated purpose@-running MySQL, and compare platforms in that -regard only. With this in mind, the result of this comparison -would be different if we included more issues into it. And in some cases, -the reason one OS is better than the other could simply be that we have put -forth more effort into testing on and optimising for that particular platform. -We are just stating our observations to help you decide on which -platform to use MySQL on in your setup. - - -@node Which version, Installation layouts, Which OS, General Installation Issues -@subsection Which MySQL Version to Use - -@cindex MySQL binary distribution -@cindex MySQL source distribution -@cindex release numbers -@cindex version, choosing -@cindex choosing, a MySQL version - -The first decision to make is whether you want to use the latest development -release or the last stable release: - -@itemize @bullet -@item -Normally, if you are beginning to use MySQL for the first time or trying -to port it to some system for which there is no binary distribution, we -recommend going with the stable release (currently version 3.23). Note -that all MySQL releases are checked with the MySQL benchmarks and an -extensive test suite before each release (even the development -releases). - -@item -Otherwise, if you are running an old system and want to upgrade, but -don't want to take chances with a non-seamless upgrade, you should -upgrade to the latest in the same branch you are using (where only the -last version number is newer than yours). We have tried to fix only -fatal bugs and make small, relatively safe changes to that version. -@end itemize - -The second decision to make is whether you want to use a source -distribution or a binary distribution. In most cases you should probably -use a binary distribution, if one exists for your platform, as this -generally will be easier to install than a source distribution. - -In the following cases you probably will be better off with a source -installation: - -@itemize @bullet -@item -If you want to install MySQL at some explicit location. (The standard -binary distributions are ``ready to run'' at any place, but you may want -to get even more flexibility). - -@item -To be able to satisfy different user requirements, we are providing two -different binary versions: one compiled with the non-transactional table -handlers (a small, fast binary), and one configured with the most -important extended options like transaction-safe tables. Both versions -are compiled from the same source distribution. All native @code{MySQL} -clients can connect to both MySQL versions. - -The extended MySQL binary distribution is marked with the -@code{-max} suffix and is configured with the same options as -@code{mysqld-max}. @xref{mysqld-max, , @code{mysqld-max}}. - -If you want to use the MySQL-Max RPM, you must first -install the standard MySQL RPM. - -@item -If you want to configure @code{mysqld} with some extra features that are -not in the standard binary distributions. Here is a list of the most -common extra options that you may want to use: - -@itemize @bullet -@item @code{--with-innodb} -@item @code{--with-berkeley-db} -@item @code{--with-raid} -@item @code{--with-libwrap} -@item @code{--with-named-z-lib (This is done for some of the binaries)} -@item @code{--with-debug[=full]} -@end itemize - -@item -The default binary distribution is normally compiled with support -for all character sets and should work on a variety of processors from -the same processor family. - -If you want a faster MySQL server you may want to recompile it -with support for only the character sets you need, use a better compiler -(like @code{pgcc}), or use compiler options that are better optimised for your -processor. - -@item -If you have found a bug and reported it to the MySQL -development team you will probably receive a patch that you need to apply to -the source distribution to get the bug fixed. - -@item -If you want to read (and/or modify) the C and C++ code that makes up -MySQL, you should get a source distribution. The source code is -always the ultimate manual. Source distributions also contain more -tests and examples than binary distributions. -@end itemize - -@cindex naming, releases of MySQL -@cindex releases, naming scheme - -The MySQL naming scheme uses release numbers that consist of three -numbers and a suffix. For example, a release name like -@code{mysql-3.21.17-beta} is interpreted like this: - -@itemize @bullet -@item -The first number (@code{3}) describes the file format. All Version 3 -releases have the same file format. - -@item -The second number (@code{21}) is the release level. Normally there are two to -choose from. One is the release/stable branch (currently @code{23}) and the -other is the development branch (currently @code{4.0}). Normally both are -stable, but the development version may have quirks, may be missing documentation on -new features, or may fail to compile on some systems. - -@item -The third number (@code{17}) is the version number within the -release level. This is incremented for each new distribution. Usually you -want the latest version for the release level you have chosen. - -@item -The suffix (@code{beta}) indicates the stability level of the release. -The possible suffixes are: - -@itemize @minus -@item -@code{alpha} indicates that the release contains some large section of -new code that hasn't been 100% tested. Known bugs (usually there are none) -should be documented in the News section. @xref{News}. There are also new -commands and extensions in most alpha releases. Active development that -may involve major code changes can occur on an alpha release, but everything -will be tested before doing a release. There should be no known bugs in any -MySQL release. - -@item -@code{beta} means that all new code has been tested. No major new -features that could cause corruption on old code are added. There should -be no known bugs. A version changes from alpha to beta when there -haven't been any reported fatal bugs within an alpha version for at least -a month and we don't plan to add any features that could make any old command -more unreliable. - -@item -@code{gamma} is a beta that has been around a while and seems to work fine. -Only minor fixes are added. This is what many other companies call a release. - -@item -If there is no suffix, it means that the version has been run for a -while at many different sites with no reports of bugs other than -platform-specific bugs. Only critical bug fixes are applied to the -release. This is what we call a stable release. -@end itemize -@end itemize - -All versions of MySQL are run through our standard tests and -benchmarks to ensure that they are relatively safe to use. Because the -standard tests are extended over time to check for all previously found bugs, -the test suite keeps getting better. - -@cindex releases, testing -@cindex testing, of MySQL releases - -Note that all releases have been tested at least with: - -@table @asis -@item An internal test suite -This is part of a production system for a customer. It has many tables with -hundreds of megabytes of data. - -@item The MySQL benchmark suite -This runs a range of common queries. It is also a test to see whether the -latest batch of optimisations actually made the code faster. -@xref{MySQL Benchmarks}. - -@item The @code{crash-me} test -This tries to determine what features the database supports and what its -capabilities and limitations are. @xref{MySQL Benchmarks}. -@end table - -Another test is that we use the newest MySQL version in our internal -production environment, on at least one machine. We have more than 100 -gigabytes of data to work with. - - -@node Installation layouts, Many versions, Which version, General Installation Issues -@subsection Installation Layouts - -@cindex installation layouts -@cindex layout of installation -@cindex directory structure, default -@cindex default installation location - -This section describes the default layout of the directories created by -installing binary and source distributions. - -A binary distribution is installed by unpacking it at the installation -location you choose (typically @file{/usr/local/mysql}) and creates the -following directories in that location: - -@multitable @columnfractions .15 .45 -@item @strong{Directory} @tab @strong{Contents of directory} -@item @file{bin} @tab Client programs and the @code{mysqld} server -@item @file{data} @tab Log files, databases -@item @file{include} @tab Include (header) files -@item @file{lib} @tab Libraries -@item @file{scripts} @tab @code{mysql_install_db} -@item @file{share/mysql} @tab Error message files -@item @file{sql-bench} @tab Benchmarks -@end multitable - -A source distribution is installed after you configure and compile it. By -default, the installation step installs files under @file{/usr/local}, in the -following subdirectories: - -@multitable @columnfractions .15 .45 -@item @strong{Directory} @tab @strong{Contents of directory} -@item @file{bin} @tab Client programs and scripts -@item @file{include/mysql} @tab Include (header) files -@item @file{info} @tab Documentation in Info format -@item @file{lib/mysql} @tab Libraries -@item @file{libexec} @tab The @code{mysqld} server -@item @file{share/mysql} @tab Error message files -@item @file{sql-bench} @tab Benchmarks and @code{crash-me} test -@item @file{var} @tab Databases and log files -@end multitable - -Within an installation directory, the layout of a source installation differs -from that of a binary installation in the following ways: - -@itemize @bullet -@item -The @code{mysqld} server is installed in the @file{libexec} -directory rather than in the @file{bin} directory. - -@item -The data directory is @file{var} rather than @file{data}. - -@item -@code{mysql_install_db} is installed in the @file{/usr/local/bin} directory -rather than in @file{/usr/local/mysql/scripts}. - -@item -The header file and library directories are @file{include/mysql} and -@file{lib/mysql} rather than @file{include} and @file{lib}. -@end itemize - -You can create your own binary installation from a compiled source -distribution by executing the script @file{scripts/make_binary_distribution}. - - -@node Many versions, MySQL binaries, Installation layouts, General Installation Issues -@subsection How and When Updates Are Released - -@cindex releases, updating -@cindex updating, releases of MySQL - -MySQL is evolving quite rapidly here at MySQL AB and we -want to share this with other MySQL users. We try to make a release -when we have very useful features that others seem to have a need for. - -We also try to help out users who request features that are easy to -implement. We take note of what our licensed users want to have, and -we especially take note of what our extended e-mail supported customers -want and try to help them out. - -No one has to download a new release. The News section will tell you if -the new release has something you really want. @xref{News}. - -We use the following policy when updating MySQL: - -@itemize @bullet -@item -For each minor update, the last number in the version string is incremented. -When there are major new features or minor incompatibilities with previous -versions, the second number in the version string is incremented. When the -file format changes, the first number is increased. - -@item -Stable-tested releases are meant to appear about 1-2 times a year, but -if small bugs are found, a release with only bug fixes will be released. - -@item -Working releases/bug fixes to old releases are meant to appear about -every 1-8 weeks. - -@item -Binary distributions for some platforms will be made by us for major releases. -Other people may make binary distributions for other systems but probably -less frequently. - -@item -We usually make patches available as soon as we have located and fixed -small bugs. They are posted to @email{bugs@@lists.mysql.com} and will -be added to the next release. - -@item -For non-critical but annoying bugs, we will add them the MySQL source -repository and they will be fixed in the next release. - -@item -If there is, by any chance, a fatal bug in a release we will make a new -release as soon as possible. We would like other companies to do this, -too. -@end itemize - -The current stable release is Version 3.23; we have already moved active -development to Version 4.0. Bugs will still be fixed in the stable version. -We don't believe in a complete freeze, as this also leaves out bug fixes -and things that ``must be done.'' ``Somewhat frozen'' means that we may -add small things that ``almost surely will not affect anything that's -already working.'' - -MySQL uses a slightly different naming scheme from most other products. -In general it's relatively safe to use any version that has been out for -a couple of weeks without being replaced with a new version. -@xref{Which version}. - -@node MySQL binaries, Installing binary, Many versions, General Installation Issues -@subsection MySQL Binaries Compiled by MySQL AB - -@cindex binary distributions - -As a service, we at MySQL AB provide a set of binary distributions -of MySQL that are compiled at our site or at sites where customers -kindly have given us access to their machines. - -These distributions are generated with @code{scripts/make_binary_distribution} -and are configured with the following compilers and options: - -@table @asis -@item SunOS 4.1.4 2 sun4c with @code{gcc} 2.7.2.1 -@code{CC=gcc CXX=gcc CXXFLAGS="-O3 -felide-constructors" ./configure --prefix=/usr/local/mysql --disable-shared --with-extra-charsets=complex --enable-assembler} - -@item SunOS 5.5.1 (and above) sun4u with @code{egcs} 1.0.3a or 2.90.27 or gcc 2.95.2 and newer -@code{CC=gcc CFLAGS="-O3" CXX=gcc CXXFLAGS="-O3 -felide-constructors -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql --with-low-memory --with-extra-charsets=complex --enable-assembler} - -@item SunOS 5.6 i86pc with @code{gcc} 2.8.1 -@code{CC=gcc CXX=gcc CXXFLAGS=-O3 ./configure --prefix=/usr/local/mysql --with-low-memory --with-extra-charsets=complex} - -@item Solaris 2.8 sparc with @code{gcc 2.95.3} -@code{CC=gcc CFLAGS="-O3 -fno-omit-frame-pointer" CXX=gcc CXXFLAGS="-O3 -fno-omit-frame-pointer -felide-constructors -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql "--with-comment=Official MySQL binary" --with-extra-charsets=complex "--with-server-suffix=" --enable-thread-safe-client --enable-local-infile --enable-assembler --disable-shared} - -@item Linux 2.0.33 i386 with @code{pgcc} 2.90.29 (@code{egcs} 1.0.3a) -@code{CFLAGS="-O3 -mpentium -mstack-align-double" CXX=gcc CXXFLAGS="-O3 -mpentium -mstack-align-double -felide-constructors -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql --enable-assembler --with-mysqld-ldflags=-all-static --with-extra-charsets=complex} - -@item Linux 2.2.x with x686 with @code{gcc} 2.95.2 -@code{CFLAGS="-O3 -mpentiumpro" CXX=gcc CXXFLAGS="-O3 -mpentiumpro -felide-constructors -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql --enable-assembler --with-mysqld-ldflags=-all-static --disable-shared --with-extra-charsets=complex} - -@item SCO 3.2v5.0.4 i386 with @code{gcc} 2.7-95q4 -@code{CC=gcc CXX=gcc CXXFLAGS=-O3 ./configure --prefix=/usr/local/mysql --with-extra-charsets=complex} - -@item AIX 2 4 with @code{gcc} 2.7.2.2 -@code{CC=gcc CXX=gcc CXXFLAGS=-O3 ./configure --prefix=/usr/local/mysql --with-extra-charsets=complex} - -@item OSF/1 V4.0 564 alpha with @code{gcc} 2.8.1 -@code{CC=gcc CFLAGS=-O CXX=gcc CXXFLAGS=-O3 ./configure --prefix=/usr/local/mysql --with-low-memory --with-extra-charsets=complex} - -@item Irix 6.3 IP32 with @code{gcc} 2.8.0 -@code{CC=gcc CXX=gcc CXXFLAGS=-O3 ./configure --prefix=/usr/local/mysql --with-extra-charsets=complex} - -@item BSDI BSD/OS 3.1 i386 with @code{gcc} 2.7.2.1 -@code{CC=gcc CXX=gcc CXXFLAGS=-O ./configure --prefix=/usr/local/mysql --with-extra-charsets=complex} - -@item BSDI BSD/OS 2.1 i386 with @code{gcc} 2.7.2 -@code{CC=gcc CXX=gcc CXXFLAGS=-O3 ./configure --prefix=/usr/local/mysql --with-extra-charsets=complex} - -@item FreeBSD 4.4-stable i386 with @code{gcc} 2.95.3 -@code{CC=gcc CFLAGS="-O3 -fno-omit-frame-pointer" CXX=gcc CXXFLAGS="-O3 -fno-omit-frame-pointer -felide-constructors -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql "--with-comment=Official MySQL binary" --with-extra-charsets=complex "--with-server-suffix=" --enable-thread-safe-client --enable-local-infile --enable-assembler --with-named-z-libs=not-used --disable-shared} -@end table - -Anyone who has more optimal options for any of the preceding -configurations listed can always mail them to the developer's mailing list at -@email{internals@@lists.mysql.com}. - -RPM distributions prior to MySQL Version 3.22 are user-contributed. -Beginning with Version 3.22, the RPMs are generated by us at -MySQL AB. - -If you want to compile a debug version of MySQL, you should add -@code{--with-debug} or @code{--with-debug=full} to the preceding configure lines -and remove any @code{-fomit-frame-pointer} options. - -For the Windows distribution, please see @ref{Windows installation}. - - -@node Installing binary, , MySQL binaries, General Installation Issues -@subsection Installing a MySQL Binary Distribution - -@cindex installing, binary distribution -@cindex binary distributions, installing - -See also @ref{Windows binary installation}, -@ref{Linux-RPM}, and @ref{Building clients}. - -You need the following tools to install a MySQL binary distribution: - -@itemize @bullet -@item -GNU @code{gunzip} to uncompress the distribution. - -@item -A reasonable @code{tar} to unpack the distribution. GNU @code{tar} is -known to work. Sun @code{tar} is known to have problems. -@end itemize - -@cindex RPM, defined -@cindex RedHat Package Manager -An alternative installation method under Linux is to use RPM (RedHat Package -Manager) distributions. @xref{Linux-RPM}. - -@c texi2html fails to split chapters if I use strong for all of this. -If you run into problems, @strong{please always use @code{mysqlbug}} when -posting questions to @email{mysql@@lists.mysql.com}. Even if the problem -isn't a bug, @code{mysqlbug} gathers system information that will help others -solve your problem. By not using @code{mysqlbug}, you lessen the likelihood -of getting a solution to your problem! You will find @code{mysqlbug} in the -@file{bin} directory after you unpack the distribution. @xref{Bug reports}. - -@cindex commands, for binary distribution -The basic commands you must execute to install and use a MySQL -binary distribution are: - -@example -shell> groupadd mysql -shell> useradd -g mysql mysql -shell> cd /usr/local -shell> gunzip < /path/to/mysql-VERSION-OS.tar.gz | tar xvf - -shell> ln -s full-path-to-mysql-VERSION-OS mysql -shell> cd mysql -shell> scripts/mysql_install_db -shell> chown -R root . -shell> chown -R mysql data -shell> chgrp -R mysql . -shell> bin/safe_mysqld --user=mysql & -or -shell> bin/mysqld_safe --user=mysql & -if you are running MySQL 4.x -@end example - -@cindex adding, new users -@cindex new users, adding -@cindex users, adding - -You can add new users using the @code{bin/mysql_setpermission} script if -you install the @code{DBI} and @code{Msql-Mysql-modules} Perl modules. - -A more detailed description follows. - -To install a binary distribution, follow these steps, then proceed -to @ref{Post-installation}, for post-installation setup and testing: - -@enumerate -@item -Pick the directory under which you want to unpack the distribution, and move -into it. In the following example, we unpack the distribution under -@file{/usr/local} and create a directory @file{/usr/local/mysql} into which -MySQL is installed. (The following instructions, therefore, assume -you have permission to create files in @file{/usr/local}. If that directory -is protected, you will need to perform the installation as @code{root}.) - -@item -Obtain a distribution file from one of the sites listed in -@ref{Getting MySQL, , Getting MySQL}. - -MySQL binary distributions are provided as compressed @code{tar} -archives and have names like @file{mysql-VERSION-OS.tar.gz}, where -@code{VERSION} is a number (for example, @code{3.21.15}), and @code{OS} -indicates the type of operating system for which the distribution is intended -(for example, @code{pc-linux-gnu-i586}). - -@item -If you see a binary distribution marked with the @code{-max} suffix, this -means that the binary has support for transaction-safe tables and other -features. @xref{mysqld-max, , @code{mysqld-max}}. Note that all binaries -are built from the same MySQL source distribution. - -@item -Add a user and group for @code{mysqld} to run as: - -@example -shell> groupadd mysql -shell> useradd -g mysql mysql -@end example - -These commands add the @code{mysql} group and the @code{mysql} user. The -syntax for @code{useradd} and @code{groupadd} may differ slightly on different -versions of Unix. They may also be called @code{adduser} and @code{addgroup}. -You may wish to call the user and group something else instead of @code{mysql}. - -@item -Change into the intended installation directory: - -@example -shell> cd /usr/local -@end example - -@item -Unpack the distribution and create the installation directory: - -@example -shell> gunzip < /path/to/mysql-VERSION-OS.tar.gz | tar xvf - -shell> ln -s full-path-to-mysql-VERSION-OS mysql -@end example - -The first command creates a directory named @file{mysql-VERSION-OS}. The -second command makes a symbolic link to that directory. This lets you refer -more easily to the installation directory as @file{/usr/local/mysql}. - -@item -Change into the installation directory: - -@example -shell> cd mysql -@end example - -You will find several files and subdirectories in the @code{mysql} directory. -The most important for installation purposes are the @file{bin} and -@file{scripts} subdirectories. - -@table @file -@item bin -@tindex PATH environment variable -@tindex environment variable, PATH -This directory contains client programs and the server -You should add the full pathname of this directory to your -@code{PATH} environment variable so that your shell finds the MySQL -programs properly. @xref{Environment variables}. - -@item scripts -This directory contains the @code{mysql_install_db} script used to initialise -the @code{mysql} database containing the grant tables that store the server -access permissions. -@end table - -@item -If you would like to use @code{mysqlaccess} and have the MySQL -distribution in some non-standard place, you must change the location where -@code{mysqlaccess} expects to find the @code{mysql} client. Edit the -@file{bin/mysqlaccess} script at approximately line 18. Search for a line -that looks like this: - -@example -$MYSQL = '/usr/local/bin/mysql'; # path to mysql executable -@end example - -Change the path to reflect the location where @code{mysql} actually is -stored on your system. If you do not do this, you will get a @code{Broken -pipe} error when you run @code{mysqlaccess}. - -@item -Create the MySQL grant tables (necessary only if you haven't -installed MySQL before): -@example -shell> scripts/mysql_install_db -@end example - -Note that MySQL versions older than Version 3.22.10 started the -MySQL server when you run @code{mysql_install_db}. This is no -longer true! - -@item -Change ownership of binaries to @code{root} and ownership of the data -directory to the user that you will run @code{mysqld} as: - -@example -shell> chown -R root /usr/local/mysql/. -shell> chown -R mysql /usr/local/mysql/data -shell> chgrp -R mysql /usr/local/mysql/. -@end example - -The first command changes the @code{owner} attribute of the files to the -@code{root} user, the second one changes the @code{owner} attribute of the -data directory to the @code{mysql} user, and the third one changes the -@code{group} attribute to the @code{mysql} group. - -@item -If you want to install support for the Perl @code{DBI}/@code{DBD} interface, -see @ref{Perl support}. - -@item -If you would like MySQL to start automatically when you boot your -machine, you can copy @code{support-files/mysql.server} to the location where -your system has its startup files. More information can be found in the -@code{support-files/mysql.server} script itself and in -@ref{Automatic start}. - -@end enumerate - -After everything has been unpacked and installed, you should initialise -and test your distribution. - -You can start the MySQL server with the following command: - -@example -shell> bin/safe_mysqld --user=mysql & -@end example - -Now proceed to @ref{safe_mysqld, , @code{safe_mysqld}}, and -@xref{Post-installation}. - - -@node Installing source, Post-installation, General Installation Issues, Installing -@section Installing a MySQL Source Distribution - -@cindex installing, source distribution -@cindex source distribution, installing -@cindex installation overview - -Before you proceed with the source installation, check first to see if our -binary is available for your platform and if it will work for you. We -put a lot of effort into making sure that our binaries are built with the -best possible options. - -You need the following tools to build and install MySQL from source: - -@itemize @bullet -@item -GNU @code{gunzip} to uncompress the distribution. - -@item -A reasonable @code{tar} to unpack the distribution. GNU @code{tar} is -known to work. Sun @code{tar} is known to have problems. - -@item -A working ANSI C++ compiler. @code{gcc} >= 2.95.2, @code{egcs} >= 1.0.2 -or @code{egcs 2.91.66}, SGI C++, and SunPro C++ are some of the -compilers that are known to work. @code{libg++} is not needed when -using @code{gcc}. @code{gcc} 2.7.x has a bug that makes it impossible -to compile some perfectly legal C++ files, such as -@file{sql/sql_base.cc}. If you only have @code{gcc} 2.7.x, you must -upgrade your @code{gcc} to be able to compile MySQL. @code{gcc} -2.8.1 is also known to have problems on some platforms, so it should be -avoided if a new compiler exists for the platform. - -@code{gcc} >= 2.95.2 is recommended when compiling MySQL -Version 3.23.x. - -@item -A good @code{make} program. GNU @code{make} is always recommended and is -sometimes required. If you have problems, we recommend trying GNU -@code{make} 3.75 or newer. -@end itemize - -If you are using a recent version of @code{gcc}, recent enough to understand the -@code{-fno-exceptions} option, it is @strong{very important} that you use -it. Otherwise, you may compile a binary that crashes randomly. We also -recommend that you use @code{-felide-constructors} and @code{-fno-rtti} along -with @code{-fno-exceptions}. When in doubt, do the following: - -@example - -CFLAGS="-O3" CXX=gcc CXXFLAGS="-O3 -felide-constructors -fno-exceptions \ - -fno-rtti" ./configure --prefix=/usr/local/mysql --enable-assembler \ - --with-mysqld-ldflags=-all-static - -@end example - -On most systems this will give you a fast and stable binary. - -@c texi2html fails to split chapters if I use strong for all of this. -If you run into problems, @strong{please always use @code{mysqlbug}} when -posting questions to @email{mysql@@lists.mysql.com}. Even if the problem -isn't a bug, @code{mysqlbug} gathers system information that will help others -solve your problem. By not using @code{mysqlbug}, you lessen the likelihood -of getting a solution to your problem! You will find @code{mysqlbug} in the -@file{scripts} directory after you unpack the distribution. -@xref{Bug reports}. - -@menu -* Quick install:: Quick installation overview -* Applying patches:: Applying patches -* configure options:: Typical @code{configure} options -* Installing source tree:: Installing from the Development Source Tree -* Compilation problems:: Problems Compiling? -* MIT-pthreads:: MIT-pthreads Notes -* Windows source build:: Windows Source Distribution -@end menu - - -@node Quick install, Applying patches, Installing source, Installing source -@subsection Quick Installation Overview - -The basic commands you must execute to install a MySQL source -distribution are: - -@example -shell> groupadd mysql -shell> useradd -g mysql mysql -shell> gunzip < mysql-VERSION.tar.gz | tar -xvf - -shell> cd mysql-VERSION -shell> ./configure --prefix=/usr/local/mysql -shell> make -shell> make install -shell> scripts/mysql_install_db -shell> chown -R root /usr/local/mysql -shell> chown -R mysql /usr/local/mysql/var -shell> chgrp -R mysql /usr/local/mysql -shell> cp support-files/my-medium.cnf /etc/my.cnf -shell> /usr/local/mysql/bin/safe_mysqld --user=mysql & -or -shell> /usr/local/mysql/bin/mysqld_safe --user=mysql & -if you are running MySQL 4.x. -@end example - -If you want to have support for InnoDB tables, you should edit the -@code{/etc/my.cnf} file and remove the @code{#} character before the -parameter that starts with @code{innodb_...}. -@xref{Option files}, and @ref{InnoDB start}. - -If you start from a source RPM, do the following: - -@example -shell> rpm --rebuild MySQL-VERSION.src.rpm -@end example - -This will make a binary RPM that you can install. - -You can add new users using the @code{bin/mysql_setpermission} script if -you install the @code{DBI} and @code{Msql-Mysql-modules} Perl modules. - -A more detailed description follows. - -To install a source distribution, follow these steps, then proceed -to @ref{Post-installation}, for post-installation initialisation and testing: - -@enumerate -@item -Pick the directory under which you want to unpack the distribution, and move -into it. - -@item -Obtain a distribution file from one of the sites listed in -@ref{Getting MySQL, , Getting MySQL}. - -@item -If you are interested in using Berkeley DB tables with MySQL, you -will need to obtain a patched version of the Berkeley DB source -code. Please read the chapter on Berkeley DB tables before -proceeding. @xref{BDB}. - -MySQL source distributions are provided as compressed @code{tar} -archives and have names like @file{mysql-VERSION.tar.gz}, where -@code{VERSION} is a number like @value{mysql_version}. - -@item -Add a user and group for @code{mysqld} to run as: - -@example -shell> groupadd mysql -shell> useradd -g mysql mysql -@end example - -These commands add the @code{mysql} group and the @code{mysql} user. The -syntax for @code{useradd} and @code{groupadd} may differ slightly on different -versions of Unix. They may also be called @code{adduser} and @code{addgroup}. -You may wish to call the user and group something else instead of @code{mysql}. - -@item -Unpack the distribution into the current directory: -@example -shell> gunzip < /path/to/mysql-VERSION.tar.gz | tar xvf - -@end example - -This command creates a directory named @file{mysql-VERSION}. - -@item -Change into the top-level directory of the unpacked distribution: - -@example -shell> cd mysql-VERSION -@end example - -Note that currently you must configure and build MySQL from -this top-level directory. You cannot build it in a different -directory. - -@item -Configure the release and compile everything: - -@example -shell> ./configure --prefix=/usr/local/mysql -shell> make -@end example - -When you run @code{configure}, you might want to specify some options. -Run @code{./configure --help} for a list of options. -@ref{configure options, , @code{configure} options}, discusses some of the -more useful options. - -If @code{configure} fails, and you are going to send mail to -@email{mysql@@lists.mysql.com} to ask for assistance, please include any -lines from @file{config.log} that you think can help solve the problem. Also -include the last couple of lines of output from @code{configure} if -@code{configure} aborts. Post the bug report using the @code{mysqlbug} -script. @xref{Bug reports}. - -If the compile fails, see @ref{Compilation problems}, for help with -a number of common problems. - -@item -Install everything: - -@example -shell> make install -@end example - -You might need to run this command as @code{root}. - -@item -Create the MySQL grant tables (necessary only if you haven't -installed MySQL before): - -@example -shell> scripts/mysql_install_db -@end example - -Note that MySQL versions older than Version 3.22.10 started the -MySQL server when you run @code{mysql_install_db}. This is no -longer true! - -@item -Change ownership of binaries to @code{root} and ownership of the data -directory to the user that you will run @code{mysqld} as: - -@example -shell> chown -R root /usr/local/mysql -shell> chown -R mysql /usr/local/mysql/var -shell> chgrp -R mysql /usr/local/mysql -@end example - -The first command changes the @code{owner} attribute of the files to the -@code{root} user, the second one changes the @code{owner} attribute of the -data directory to the @code{mysql} user, and the third one changes the -@code{group} attribute to the @code{mysql} group. - -@item -If you want to install support for the Perl @code{DBI}/@code{DBD} interface, -see @ref{Perl support}. - -@item -If you would like MySQL to start automatically when you boot your -machine, you can copy @code{support-files/mysql.server} to the location where -your system has its startup files. More information can be found in the -@code{support-files/mysql.server} script itself and in -@ref{Automatic start}. -@end enumerate - -After everything has been installed, you should initialise and test your -distribution: - -@example -shell> /usr/local/mysql/bin/safe_mysqld --user=mysql & -@end example - -If that command fails immediately with @code{mysqld daemon ended}, you can -find some information in the file @file{mysql-data-directory/'hostname'.err}. -The likely reason is that you already have another @code{mysqld} server -running. @xref{Multiple servers}. - -Now proceed to @ref{Post-installation}. - - -@node Applying patches, configure options, Quick install, Installing source -@subsection Applying Patches - -@cindex patches, applying -@cindex applying, patches - -Sometimes patches appear on the mailing list or are placed in the -patches area of the MySQL web site -(@uref{http://www.mysql.com/Downloads/Patches/}). - -To apply a patch from the mailing list, save the message in which the patch -appears in a file, change into the top-level directory of your MySQL -source tree, and run these commands: - -@example -shell> patch -p1 < patch-file-name -shell> rm config.cache -shell> make clean -@end example - -Patches from the FTP site are distributed as plain text files or as files -compressed with @code{gzip}. Apply a plain patch as shown -previously for -mailing list patches. To apply a compressed patch, change into the -top-level directory of your MySQL source tree and run these -commands: - -@example -shell> gunzip < patch-file-name.gz | patch -p1 -shell> rm config.cache -shell> make clean -@end example - -After applying a patch, follow the instructions for a normal source install, -beginning with the @code{./configure} step. After running the @code{make -install} step, restart your MySQL server. - -You may need to bring down any currently running server before you run -@code{make install}. (Use @code{mysqladmin shutdown} to do this.) Some -systems do not allow you to install a new version of a program if it replaces -the version that is currently executing. - - -@node configure options, Installing source tree, Applying patches, Installing source -@subsection Typical @code{configure} Options - -@findex without-server option -@cindex @code{configure} script -@cindex options, configure -@cindex configuration options -@cindex log files -@cindex files, log - -The @code{configure} script gives you a great deal of control over how -you configure your MySQL distribution. Typically you do this -using options on the @code{configure} command-line. You can also affect -@code{configure} using certain environment variables. @xref{Environment -variables}. For a list of options supported by @code{configure}, run -this command: - -@example -shell> ./configure --help -@end example - -Some of the more commonly-used @code{configure} options are described here: - -@itemize @bullet -@item -To compile just the MySQL client libraries and client programs and -not the server, use the @code{--without-server} option: - -@example -shell> ./configure --without-server -@end example - -@c FIX incorrect.. - -If you don't have a C++ compiler, @code{mysql} will not compile (it is the -one client program that requires C++). In this case, -you can remove the code in @code{configure} that tests for the C++ compiler -and then run @code{./configure} with the @code{--without-server} option. The -compile step will still try to build @code{mysql}, but you can ignore any -warnings about @file{mysql.cc}. (If @code{make} stops, try @code{make -k} -to tell it to continue with the rest of the build even if errors occur.) - -@item -If you want to get an embedded MySQL library (@code{libmysqld.a}) you should -use the @code{--with-embedded-server} option. - -@item -If you don't want your log files and database directories located under -@file{/usr/local/var}, use a @code{configure} command, something like one -of these: - -@example -shell> ./configure --prefix=/usr/local/mysql -shell> ./configure --prefix=/usr/local \ - --localstatedir=/usr/local/mysql/data -@end example - -The first command changes the installation prefix so that everything is -installed under @file{/usr/local/mysql} rather than the default of -@file{/usr/local}. The second command preserves the default installation -prefix, but overrides the default location for database directories -(normally @file{/usr/local/var}) and changes it to -@code{/usr/local/mysql/data}. After you have compiled MySQL, you can -change these options with option files. @xref{Option files}. - -@cindex changing socket location -@cindex socket location, changing -@cindex mysql.sock, changing location of -@item -If you are using Unix and you want the MySQL socket located somewhere -other than the default location (normally in the directory @file{/tmp} or -@file{/var/run}) use a @code{configure} command like this: - -@example -shell> ./configure --with-unix-socket-path=/usr/local/mysql/tmp/mysql.sock -@end example - -Note that the given file must be an absolute pathname! -You can also later change the location @file{mysql.sock} by using the MySQL -option files. @xref{Problems with mysql.sock}. - -@cindex compiling, statically -@cindex statically, compiling -@item -If you want to compile statically linked programs (for example, to make a -binary distribution, to get more speed, or to work around problems with some -RedHat Linux distributions), run @code{configure} like this: - -@example -shell> ./configure --with-client-ldflags=-all-static \ - --with-mysqld-ldflags=-all-static -@end example - - - -@tindex @code{CC} environment variable -@tindex environment variable, @code{CC} -@tindex @code{CXX} environment variable -@tindex environment variable, @code{CXX} -@cindex @code{gcc} -@cindex C++ compiler, @code{gcc} -@cindex compiler, C++ @code{gcc} -@item -If you are using @code{gcc} and don't have @code{libg++} or @code{libstdc++} -installed, you can tell @code{configure} to use @code{gcc} as your C++ -compiler: - -@example -shell> CC=gcc CXX=gcc ./configure -@end example - -When you use @code{gcc} as your C++ compiler, it will not attempt to link in -@code{libg++} or @code{libstdc++}. This may be a good idea to do even if you -have the above libraries installed, as some versions of these libraries have -caused strange problems for MySQL users in the past. - -Here are some common environment variables to set depending on -the compiler you are using: - -@tindex CXXFLAGS environment variable -@tindex environment variable, CXXFLAGS -@multitable @columnfractions .19 .81 -@item @strong{Compiler} @tab @strong{Recommended options} -@item gcc 2.7.2.1 @tab -CC=gcc CXX=gcc CXXFLAGS="-O3 -felide-constructors" -@item egcs 1.0.3a @tab -CC=gcc CXX=gcc CXXFLAGS="-O3 -felide-constructors -fno-exceptions -fno-rtti" -@item gcc 2.95.2 @tab -CFLAGS="-O3 -mpentiumpro" CXX=gcc CXXFLAGS="-O3 -mpentiumpro \ --felide-constructors -fno-exceptions -fno-rtti" -@item pgcc 2.90.29 or newer @tab -CFLAGS="-O3 -mpentiumpro -mstack-align-double" CXX=gcc \ -CXXFLAGS="-O3 -mpentiumpro -mstack-align-double -felide-constructors \ --fno-exceptions -fno-rtti" -@end multitable - -In most cases you can get a reasonably optimal MySQL binary by -using the options from the preceding table and adding the following options to the -configure line: - -@example ---prefix=/usr/local/mysql --enable-assembler \ ---with-mysqld-ldflags=-all-static -@end example - -The full configure line would, in other words, be something like the -following for all recent gcc versions: - -@example -CFLAGS="-O3 -mpentiumpro" CXX=gcc CXXFLAGS="-O3 -mpentiumpro \ --felide-constructors -fno-exceptions -fno-rtti" ./configure \ ---prefix=/usr/local/mysql --enable-assembler \ ---with-mysqld-ldflags=-all-static -@end example - -The binaries we provide on the MySQL web site at -@uref{http://www.mysql.com/} are all compiled with full optimisation and -should be perfect for most users. @xref{MySQL binaries}. There are some -things you can tweak to make an even faster binary, but this is only for -advanced users. @xref{Compile and link options}. - -If the build fails and produces errors about your compiler or linker not -being able to create the shared library @file{libmysqlclient.so.#} (@samp{#} -is a version number), you can work around this problem by giving the -@code{--disable-shared} option to @code{configure}. In this case, -@code{configure} will not build a shared @file{libmysqlclient.so.#} library. - -@cindex default values, suppression -@cindex suppression, default values -@item -You can configure MySQL not to use @code{DEFAULT} column values for -non-@code{NULL} columns (that is, columns that are not allowed to be -@code{NULL}). This causes @code{INSERT} statements to generate an error -unless you explicitly specify values for all columns that require a -non-@code{NULL} value. To suppress use of default values, run -@code{configure} like this: - -@tindex CXXFLAGS environment variable -@tindex environment variable, CXXFLAGS -@example -shell> CXXFLAGS=-DDONT_USE_DEFAULT_FIELDS ./configure -@end example - -@cindex character sets -@findex configure option, --with-charset -@findex configure option, --with-extra-charsets -@item -By default, MySQL uses the ISO-8859-1 (Latin1) character set. To -change the default set, use the @code{--with-charset} option: -@example -shell> ./configure --with-charset=CHARSET -@end example -@code{CHARSET} may be one of @code{big5}, @code{cp1251}, @code{cp1257}, -@code{czech}, @code{danish}, @code{dec8}, @code{dos}, @code{euc_kr}, -@code{gb2312}, @code{gbk}, @code{german1}, @code{hebrew}, @code{hp8}, -@code{hungarian}, @code{koi8_ru}, @code{koi8_ukr}, @code{latin1}, -@code{latin2}, @code{sjis}, @code{swe7}, @code{tis620}, @code{ujis}, -@code{usa7}, or @code{win1251ukr}. -@xref{Character sets}. - -If you want to convert characters between the server and the client, -you should take a look at the @code{SET CHARACTER SET} command. -@xref{SET OPTION, , @code{SET}}. - -@cindex @code{myisamchk} -@strong{Warning}: If you change character sets after having created any -tables, you will have to run @code{myisamchk -r -q} on every table. Your -indexes may be sorted incorrectly otherwise. (This can happen if you -install MySQL, create some tables, then reconfigure -MySQL to use a different character set and reinstall it.) - -With the option @code{--with-extra-charsets=LIST} you can define -which additional character sets should be compiled into the server. - -Here @code{LIST} is either a list of character -sets separated with spaces, -@code{complex} to include all characters that can't be dynamically loaded, -or @code{all} to include all character sets into the binaries. - -@item -To configure MySQL with debugging code, use the @code{--with-debug} -option: -@example -shell> ./configure --with-debug -@end example -This causes a safe memory allocator to be included that can find some errors -and that provides output about what is happening. -@xref{Debugging server}. - -@item -If your client programs are using threads, you need to also compile a -thread-safe version of the MySQL client library with the -@code{--enable-thread-safe-client} configure options. This will create a -@code{libmysqlclient_r} library with which you should link your threaded -applications. @xref{Threaded clients}. - -@item -Options that pertain to particular systems can be found in the -system-specific section of this manual. -@xref{Operating System Specific Notes}. -@end itemize - - -@node Installing source tree, Compilation problems, configure options, Installing source -@subsection Installing from the Development Source Tree - -@cindex development source tree -@cindex BitKeeper tree -@cindex CVS tree - -@strong{Caution}: You should read this section only if you are interested -in helping us test our new code. If you just want to get MySQL up -and running on your system, you should use a standard release distribution -(either a source or binary distribution will do). - -To obtain our most recent development source tree, use these instructions: - -@enumerate -@item -Download @code{BitKeeper} from -@uref{http://www.bitmover.com/cgi-bin/download.cgi}. You will need -@code{Bitkeeper} 2.0 or newer to access our repository. - -@item -Follow the instructions to install it. - -@item -After @code{BitKeeper} is installed, first go to the directory you -want to work from, and then use one of the following commands to clone -the MySQL version branch of your choice: - -To clone the 3.23 branch, use this command: - -@example -shell> bk clone bk://work.mysql.com:7000 mysql-3.23 -@end example - -To clone the 4.0 branch, use this command: - -@example -shell> bk clone bk://work.mysql.com:7001 mysql-4.0 -@end example - -To clone the 4.1 branch, use this command: - -@example -shell> bk clone bk://work.mysql.com:7004 mysql-4.1 -@end example - -In the preceding examples the source tree will be set up in the -@file{mysql-3.23/}, @file{mysql-4.0/}, or @file{mysql-4.1/} -subdirectory of your current directory. - -The initial download of the source tree may take a while, depending on the -speed of your connection; be patient. - -@item -You will need GNU @code{autoconf 2.52}, @code{automake 1.5}, -@code{libtool 1.4}, and @code{m4} to run the next set of commands. - -@example -shell> cd mysql-4.0 -shell> bk -r get -Sq -shell> aclocal; autoheader; autoconf; automake; -shell> ./configure # Add your favorite options here -shell> make -@end example - -If you get some strange error during this stage, check that you really -have @code{libtool} installed! - -A collection of our standard configure scripts is located in the -@file{BUILD/} subdirectory. If you are lazy, you can use -@file{BUILD/compile-pentium-debug}. To compile on a different architecture, -modify the script by removing flags that are Pentium-specific. - -@item -When the build is done, run @code{make install}. Be careful with this -on a production machine; the command may overwrite your live release -installation. If you have another installation of MySQL, we -recommand that you run @code{./configure} with different values for the -@code{prefix}, @code{with-tcp-port}, and @code{unix-socket-path} options than -those used for your production server. - -@item -Play hard with your new installation and try to make the new features -crash. Start by running @code{make test}. @xref{MySQL test suite}. - -@item -If you have gotten to the @code{make} stage and the distribution does -not compile, please report it to @email{bugs@@lists.mysql.com}. If you -have installed the latest versions of the required GNU tools, and they -crash trying to process our configuration files, please report that also. -However, if you execute @code{aclocal} and get a @code{command not found} -error or a similar problem, do not report it. Instead, make sure all -the necessary tools are installed and that your @code{PATH} variable is -set correctly so that your shell can find them. - -@item -After the initial @code{bk clone} operation to get the source tree, you -should run @code{bk pull} periodically to get the updates. - -@item -You can examine the change history for the tree with all the diffs by using -@code{bk sccstool}. If you see some funny diffs or code that you have a -question about, do not hesitate to send e-mail to -@email{internals@@lists.mysql.com}. Also, if you think you have a better idea -on how to do something, send an e-mail to the same address with a patch. -@code{bk diffs} will produce a patch for you after you have made changes -to the source. If you do not have the time to code your idea, just send -a description. - -@item -@code{BitKeeper} has a nice help utility that you can access via -@code{bk helptool}. - -@item -Please note that any commits (@code{bk ci} or @code{bk citool}) will -trigger the posting of a message with the changeset to our internals -mailing list, as well as the usual openlogging.org submission with -just the changeset comments. -Generally, you wouldn't need to use commit (since the public tree will -not allow @code{bk push}), but rather use the @code{bk diffs} method -described previously. - -@end enumerate - - -@node Compilation problems, MIT-pthreads, Installing source tree, Installing source -@subsection Problems Compiling? - -@cindex compiling, problems -@cindex problems, compiling -@cindex reconfiguring -@cindex @code{config.cache} file -@cindex files, @code{config.cache} - -All MySQL programs compile cleanly for us with no warnings on -Solaris using @code{gcc}. On other systems, warnings may occur due to -differences in system include files. See @ref{MIT-pthreads} for warnings -that may occur when using MIT-pthreads. For other problems, check -the following list. - -The solution to many problems involves reconfiguring. If you do need to -reconfigure, take note of the following: - -@cindex running @code{configure} after prior invocation -@cindex @code{configure}, running after prior invocation -@cindex reconfiguring -@cindex config.cache -@itemize @bullet -@item -If @code{configure} is run after it already has been run, it may use -information that was gathered during its previous invocation. This -information is stored in @file{config.cache}. When @code{configure} starts -up, it looks for that file and reads its contents if it exists, on the -assumption that the information is still correct. That assumption is invalid -when you reconfigure. - -@item -Each time you run @code{configure}, you must run @code{make} again -to recompile. However, you may want to remove old object files from previous -builds first because they were compiled using different configuration options. -@end itemize - -To prevent old configuration information or object files from being used, -run these commands before rerunning @code{configure}: - -@example -shell> rm config.cache -shell> make clean -@end example - -Alternatively, you can run @code{make distclean}. - -The following list describes some of the problems when compiling MySQL -that have been found to occur most often: - -@itemize @bullet -@item -@cindex @code{cc1plus} problems -@cindex @code{fatal signal 11} -@cindex @code{sql_yacc.cc} problems -@cindex internal compiler errors -@cindex virtual memory, problems while compiling -@cindex configure option, --with-low-memory -If you get errors when compiling @file{sql_yacc.cc}, such as the ones shown -here, you have probably run out of memory or swap space: - -@example -Internal compiler error: program cc1plus got fatal signal 11 - or -Out of virtual memory - or -Virtual memory exhausted -@end example - -The problem is that @code{gcc} requires huge amounts of memory to compile -@file{sql_yacc.cc} with inline functions. Try running @code{configure} with -the @code{--with-low-memory} option: - -@example -shell> ./configure --with-low-memory -@end example - -This option causes @code{-fno-inline} to be added to the compile line if you -are using @code{gcc} and @code{-O0} if you are using something else. You -should try the @code{--with-low-memory} option even if you have so much -memory and swap space that you think you can't possibly have run out. This -problem has been observed to occur even on systems with generous hardware -configurations, and the @code{--with-low-memory} option usually fixes it. - -@item -By default, @code{configure} picks @code{c++} as the compiler name and -GNU @code{c++} links with @code{-lg++}. If you are using @code{gcc}, -that behaviour can cause problems during configuration such as this: - -@cindex C++ compiler cannot create executables -@example -configure: error: installation or configuration problem: -C++ compiler cannot create executables. -@end example - -@tindex CXX environment variable -@tindex Environment variable, CXX -You might also observe problems during compilation related to -@code{g++}, @code{libg++}, or @code{libstdc++}. - -One cause of these problems is that you may not have @code{g++}, or you may -have @code{g++} but not @code{libg++}, or @code{libstdc++}. Take a look at -the @file{config.log} file. It should contain the exact reason why your c++ -compiler didn't work! To work around these problems, you can use @code{gcc} -as your C++ compiler. Try setting the environment variable @code{CXX} to -@code{"gcc -O3"}. For example: - -@tindex CXX environment variable -@tindex Environment variables, CXX -@example -shell> CXX="gcc -O3" ./configure -@end example - -This works because @code{gcc} compiles C++ sources as well as @code{g++} -does, but does not link in @code{libg++} or @code{libstdc++} by default. - -Another way to fix these problems, of course, is to install @code{g++}, -@code{libg++}, and @code{libstdc++}. We would however like to recommend -you to not use @code{libg++} or @code{libstdc++} with MySQL as this will -only increase the binary size of mysqld without giving you any benefits. -Some versions of these libraries have also caused strange problems for -MySQL users in the past. - -@item -If your compile fails with errors, such as any of the following, -you must upgrade your version of @code{make} to GNU @code{make}: - -@example -making all in mit-pthreads -make: Fatal error in reader: Makefile, line 18: -Badly formed macro assignment - or -make: file `Makefile' line 18: Must be a separator (: - or -pthread.h: No such file or directory -@end example - -@cindex Solaris troubleshooting -@cindex FreeBSD troubleshooting -@cindex troubleshooting, Solaris -@cindex troubleshooting, FreeBSD -Solaris and FreeBSD are known to have troublesome @code{make} programs. - -GNU @code{make} Version 3.75 is known to work. - -@tindex CC environment variable -@tindex environment variable, CC -@tindex CXX environment variable -@tindex environment variable, CXX -@tindex CFLAGS environment variable -@tindex environment variable, CFLAGS -@tindex CXXFLAGS environment variable -@tindex environment variable, CXXFLAGS -@item -If you want to define flags to be used by your C or C++ compilers, do so by -adding the flags to the @code{CFLAGS} and @code{CXXFLAGS} environment -variables. You can also specify the compiler names this way using @code{CC} -and @code{CXX}. For example: - -@example -shell> CC=gcc -shell> CFLAGS=-O3 -shell> CXX=gcc -shell> CXXFLAGS=-O3 -shell> export CC CFLAGS CXX CXXFLAGS -@end example - -See @ref{MySQL binaries}, for a list of flag definitions that have been found -to be useful on various systems. - -@item -If you get an error message like this, -you need to upgrade your @code{gcc} compiler: - -@example -client/libmysql.c:273: parse error before `__attribute__' -@end example - -@code{gcc} 2.8.1 is known to work, but we recommend using @code{gcc} 2.95.2 or -@code{egcs} 1.0.3a instead. - -@item -If you get errors such as those shown here when compiling @code{mysqld}, -@code{configure} didn't correctly detect the type of the last argument to -@code{accept()}, @code{getsockname()}, or @code{getpeername()}: - -@example -cxx: Error: mysqld.cc, line 645: In this statement, the referenced - type of the pointer value "&length" is "unsigned long", which - is not compatible with "int". -new_sock = accept(sock, (struct sockaddr *)&cAddr, &length); -@end example - -To fix this, edit the @file{config.h} file (which is generated by -@code{configure}). Look for these lines: - -@example -/* Define as the base type of the last arg to accept */ -#define SOCKET_SIZE_TYPE XXX -@end example - -Change @code{XXX} to @code{size_t} or @code{int}, depending on your -operating system. (Note that you will have to do this each time you run -@code{configure} because @code{configure} regenerates @file{config.h}.) - -@item -The @file{sql_yacc.cc} file is generated from @file{sql_yacc.yy}. Normally -the build process doesn't need to create @file{sql_yacc.cc}, because -MySQL comes with an already generated copy. However, if you do need -to re-create it, you might encounter this error: - -@example -"sql_yacc.yy", line xxx fatal: default action causes potential... -@end example - -This is a sign that your version of @code{yacc} is deficient. -You probably need to install @code{bison} (the GNU version of @code{yacc}) -and use that instead. - -@item -If you need to debug @code{mysqld} or a MySQL client, run -@code{configure} with the @code{--with-debug} option, then recompile and -link your clients with the new client library. @xref{Debugging client}. -@end itemize - - -@node MIT-pthreads, Windows source build, Compilation problems, Installing source -@subsection MIT-pthreads Notes - -@cindex MIT-pthreads -@cindex thread support, non-native - -This section describes some of the issues involved in using MIT-pthreads. - -Note that on Linux you should @strong{not} use MIT-pthreads but install LinuxThreads! -@xref{Linux}. - -If your system does not provide native thread support, you will need to -build MySQL using the MIT-pthreads package. This includes -older FreeBSD systems, SunOS 4.x, Solaris 2.4 and earlier, and some others. -@xref{Which OS}. - -@itemize @bullet -@item -On most systems, you can force MIT-pthreads to be used by running -@code{configure} with the @code{--with-mit-threads} option: - -@example -shell> ./configure --with-mit-threads -@end example - -Building in a non-source directory is not supported when using -MIT-pthreads because we want to minimise our changes to this code. - -@item -The checks that determine whether to use MIT-pthreads occur only -during the part of the configuration process that deals with the server -code. If you have configured the distribution using @code{--without-server} -to build only the client code, clients will not know whether -MIT-pthreads is being used and will use Unix socket connections by default. -Because Unix sockets do not work under MIT-pthreads on some platforms, this -means you will need to use @code{-h} or @code{--host} when you run client -programs. - -@item -When MySQL is compiled using MIT-pthreads, system locking is -disabled by default for performance reasons. You can tell the server to use -system locking with the @code{--external-locking} option. This is only -needed if you want to be able to run two MySQL servers against the same -data files (not recommended). - -@item -Sometimes the pthread @code{bind()} command fails to bind to a socket without -any error message (at least on Solaris). The result is that all connections -to the server fail. For example: - -@example -shell> mysqladmin version -mysqladmin: connect to server at '' failed; -error: 'Can't connect to mysql server on localhost (146)' -@end example - -The solution to this is to kill the @code{mysqld} server and restart it. -This has only happened to us when we have forced the server down and done -a restart immediately. - -@item -With MIT-pthreads, the @code{sleep()} system call isn't interruptible with -@code{SIGINT} (break). This is only noticeable when you run -@code{mysqladmin --sleep}. You must wait for the @code{sleep()} call to -terminate before the interrupt is served and the process stops. - -@item -When linking, you may receive warning messages like these (at least on -Solaris); they can be ignored: - -@example -ld: warning: symbol `_iob' has differing sizes: - (file /my/local/pthreads/lib/libpthread.a(findfp.o) value=0x4; -file /usr/lib/libc.so value=0x140); - /my/local/pthreads/lib/libpthread.a(findfp.o) definition taken -ld: warning: symbol `__iob' has differing sizes: - (file /my/local/pthreads/lib/libpthread.a(findfp.o) value=0x4; -file /usr/lib/libc.so value=0x140); - /my/local/pthreads/lib/libpthread.a(findfp.o) definition taken -@end example - -@item -Some other warnings also can be ignored: - -@example -implicit declaration of function `int strtoll(...)' -implicit declaration of function `int strtoul(...)' -@end example - -@item -We haven't gotten @code{readline} to work with MIT-pthreads. (This isn't -needed, but may be interesting for someone.) -@end itemize - - -@node Windows source build, , MIT-pthreads, Installing source -@subsection Windows Source Distribution - -You will need the following: - -@itemize @bullet -@item -VC++ 6.0 compiler (updated with 4 or 5 SP and Pre-processor package) -The Pre-processor package is necessary for the macro assembler. -More details at: -@uref{http://msdn.microsoft.com/vstudio/sp/vs6sp5/faq.asp}. -@item -The MySQL source distribution for Windows, which can be downloaded -from @uref{http://www.mysql.com/downloads/}. -@end itemize - -Building MySQL - -@enumerate -@item -Create a work directory (e.g., workdir). -@item -Unpack the source distribution in the aforementioned directory. -@item -Start the VC++ 6.0 compiler. -@item -In the @code{File} menu, select @code{Open Workspace}. -@item -Open the @file{mysql.dsw} workspace you find on the work directory. -@item -From the @code{Build} menu, -select the @code{Set Active Configuration} menu. -@item -Click over the screen selecting @code{mysqld - Win32 Debug} -and click OK. -@item -Press @code{F7} to begin the build of the debug server, libs, and -some client applications. -@item -When the compilation finishes, copy the libs and the executables -to a separate directory. -@item -Compile the release versions that you want, in the same way. -@item -Create the directory for the MySQL stuff: e.g., @file{c:\mysql} -@item -From the workdir directory copy for the c:\mysql directory the -following directories: - -@itemize @bullet -@item Data -@item Docs -@item Share -@end itemize - -@item -Create the directory @file{c:\mysql\bin} and copy all the servers -and clients that you compiled previously. -@item -If you want, also create the @file{lib} directory and copy the -libs that you compiled previously. -@item -Do a clean using Visual Studio. -@end enumerate - -Set up and start the server in the same way as for the binary -Windows distribution. @xref{Windows prepare environment}. - - -@node Post-installation, Upgrade, Installing source, Installing -@section Post-installation Setup and Testing - -@cindex post-installation, setup and testing -@cindex testing, post-installation -@cindex setup, post-installation - -@menu -* mysql_install_db:: Problems running @code{mysql_install_db} -* Starting server:: Problems starting the MySQL server -* Automatic start:: Starting and stopping MySQL automatically -@end menu - -Once you've installed MySQL (from either a binary or source -distribution), you need to initialise the grant tables, start the server, -and make sure that the server works okay. You may also wish to arrange -for the server to be started and stopped automatically when your system -starts up and shuts down. - -Normally you install the grant tables and start the server like this -for installation from a source distribution: -@cindex starting, the server -@cindex server, starting - -@example -shell> ./scripts/mysql_install_db -shell> cd mysql_installation_directory -shell> ./bin/safe_mysqld --user=mysql & -@end example - -For a binary distribution (not RPM or pkg packages), do this: - -@example -shell> cd mysql_installation_directory -shell> ./bin/mysql_install_db -shell> ./bin/safe_mysqld --user=mysql & -@end example - -This creates the @code{mysql} database which will hold all database -privileges, the @code{test} database which you can use to test -MySQL, and also privilege entries for the user that run -@code{mysql_install_db} and a @code{root} user (without any passwords). -This also starts the @code{mysqld} server. - -@code{mysql_install_db} will not overwrite any old privilege tables, so -it should be safe to run in any circumstances. If you don't want to -have the @code{test} database you can remove it with @code{mysqladmin -u -root drop test}. - -Testing is most easily done from the top-level directory of the MySQL -distribution. For a binary distribution, this is your installation directory -(typically something like @file{/usr/local/mysql}). For a source -distribution, this is the main directory of your MySQL source tree. -@cindex testing, the server - -In the commands shown in this section and in the following -subsections, @code{BINDIR} is the path to the location in which programs -like @code{mysqladmin} and @code{safe_mysqld} are installed. For a -binary distribution, this is the @file{bin} directory within the -distribution. For a source distribution, @code{BINDIR} is probably -@file{/usr/local/bin}, unless you specified an installation directory -other than @file{/usr/local} when you ran @code{configure}. -@code{EXECDIR} is the location in which the @code{mysqld} server is -installed. For a binary distribution, this is the same as -@code{BINDIR}. For a source distribution, @code{EXECDIR} is probably -@file{/usr/local/libexec}. - -Testing is described in detail: -@cindex testing, installation - -@enumerate -@item -If necessary, start the @code{mysqld} server and set up the initial -MySQL grant tables containing the privileges that determine how -users are allowed to connect to the server. This is normally done with the -@code{mysql_install_db} script: - -@example -shell> scripts/mysql_install_db -@end example - -Typically, @code{mysql_install_db} needs to be run only the first time you -install MySQL. Therefore, if you are upgrading an existing -installation, you can skip this step. (However, @code{mysql_install_db} is -quite safe to use and will not update any tables that already exist, so if -you are unsure of what to do, you can always run @code{mysql_install_db}.) - -@code{mysql_install_db} creates six tables (@code{user}, @code{db}, -@code{host}, @code{tables_priv}, @code{columns_priv}, and @code{func}) in the -@code{mysql} database. A description of the initial privileges is given in -@ref{Default privileges}. Briefly, these privileges allow the MySQL -@code{root} user to do anything, and allow anybody to create or use databases -with a name of @code{test} or starting with @code{test_}. - -If you don't set up the grant tables, the following error will appear in the -log file when you start the server: - -@tindex host.frm, problems finding -@example -mysqld: Can't find file: 'host.frm' -@end example - -This may also happen with a binary MySQL distribution if you -don't start MySQL by executing exactly @code{./bin/safe_mysqld}! -@xref{safe_mysqld, , @code{safe_mysqld}}. - -You might need to run @code{mysql_install_db} as @code{root}. However, -if you prefer, you can run the MySQL server as an unprivileged -(non-@code{root}) user, provided that the user can read and write files in -the database directory. Instructions for running MySQL as an -unprivileged user are given in @ref{Changing MySQL user, , Changing -MySQL user}. - -If you have problems with @code{mysql_install_db}, see -@ref{mysql_install_db, , @code{mysql_install_db}}. - -There are some alternatives to running the @code{mysql_install_db} -script as it is provided in the MySQL distribution: - -@itemize @bullet -@item -You may want to edit @code{mysql_install_db} before running it, to change -the initial privileges that are installed into the grant tables. This is -useful if you want to install MySQL on a lot of machines with the -same privileges. In this case you probably should need only to add a few -extra @code{INSERT} statements to the @code{mysql.user} and @code{mysql.db} -tables! - -@item -If you want to change things in the grant tables after installing them, you -can run @code{mysql_install_db}, then use @code{mysql -u root mysql} to -connect to the grant tables as the MySQL @code{root} user and issue -SQL statements to modify the grant tables directly. - -@item -It is possible to re-create the grant tables completely after they have -already been created. You might want to do this if you've already installed -the tables but then want to re-create them after editing -@code{mysql_install_db}. -@end itemize - -For more information about these alternatives, see @ref{Default privileges}. - -@item -Start the MySQL server like this: - -@example -shell> cd mysql_installation_directory -shell> bin/safe_mysqld & -@end example - -If you have problems starting the server, see @ref{Starting server}. - -@item -Use @code{mysqladmin} to verify that the server is running. The following -commands provide a simple test to check that the server is up and responding -to connections: - -@example -shell> BINDIR/mysqladmin version -shell> BINDIR/mysqladmin variables -@end example - -The output from @code{mysqladmin version} varies slightly depending on your -platform and version of MySQL, but should be similar to that shown here: - -@example -shell> BINDIR/mysqladmin version -mysqladmin Ver 8.14 Distrib 3.23.32, for linux on i586 -Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB -This software comes with ABSOLUTELY NO WARRANTY. This is free software, -and you are welcome to modify and redistribute it under the GPL license. - -Server version 3.23.32-debug -Protocol version 10 -Connection Localhost via Unix socket -TCP port 3306 -UNIX socket /tmp/mysql.sock -Uptime: 16 sec - -Threads: 1 Questions: 9 Slow queries: 0 -Opens: 7 Flush tables: 2 Open tables: 0 -Queries per second avg: 0.000 -Memory in use: 132K Max memory used: 16773K -@end example - -To get a feeling for what else you can do with @code{BINDIR/mysqladmin}, -invoke it with the @code{--help} option. - -@item -Verify that you can shut down the server: -@cindex server, shutdown -@cindex shutting down, the server - -@example -shell> BINDIR/mysqladmin -u root shutdown -@end example - -@item -Verify that you can restart the server. Do this using @code{safe_mysqld} or -by invoking @code{mysqld} directly. For example: - -@cindex server, restart -@cindex restarting, the server - -@example -shell> BINDIR/safe_mysqld --log & -@end example - -If @code{safe_mysqld} fails, try running it from the MySQL -installation directory (if you are not already there). If that doesn't work, -see @ref{Starting server}. - -@item -Run some simple tests to verify that the server is working. -The output should be similar to what is shown here: - -@example -shell> BINDIR/mysqlshow -+-----------+ -| Databases | -+-----------+ -| mysql | -+-----------+ - -shell> BINDIR/mysqlshow mysql -Database: mysql -+--------------+ -| Tables | -+--------------+ -| columns_priv | -| db | -| func | -| host | -| tables_priv | -| user | -+--------------+ - -shell> BINDIR/mysql -e "SELECT host,db,user FROM db" mysql -+------+--------+------+ -| host | db | user | -+------+--------+------+ -| % | test | | -| % | test_% | | -+------+--------+------+ -@end example - -There is also a benchmark suite in the @file{sql-bench} directory (under the -MySQL installation directory) that you can use to compare how -MySQL performs on different platforms. The @file{sql-bench/Results} -directory contains the results from many runs against different databases and -platforms. To run all tests, execute these commands: - -@example -shell> cd sql-bench -shell> run-all-tests -@end example - -If you don't have the @file{sql-bench} directory, you are probably using an -RPM for a binary distribution. (Source distribution RPMs include the -benchmark directory.) In this case, you must first install the benchmark -suite before you can use it. Beginning with MySQL Version 3.22, -there are benchmark RPM files named @file{mysql-bench-VERSION-i386.rpm} that -contain benchmark code and data. - -If you have a source distribution, you can also run the tests in the -@file{tests} subdirectory. For example, to run @file{auto_increment.tst}, do -this: - -@example -shell> BINDIR/mysql -vvf test < ./tests/auto_increment.tst -@end example - -The expected results are shown in the @file{./tests/auto_increment.res} file. -@end enumerate - - -@node mysql_install_db, Starting server, Post-installation, Post-installation -@subsection Problems Running @code{mysql_install_db} -@cindex @code{mysql_install_db} script -@cindex scripts, @code{mysql_install_db} - -The purpose of the @code{mysql_install_db} script is to generate new -MySQL privilege tables. It will not affect any other data! -It will also not do anything if you already have MySQL privilege -tables installed! - -If you want to re-create your privilege tables, you should take down -the @code{mysqld} server, if it's running, and then do something like: - -@example -mv mysql-data-directory/mysql mysql-data-directory/mysql-old -mysql_install_db -@end example - -This section lists problems you might encounter when you run -@code{mysql_install_db}: - -@table @strong -@item @code{mysql_install_db} doesn't install the grant tables - -You may find that @code{mysql_install_db} fails to install the grant -tables and terminates after displaying the following messages: - -@example -starting mysqld daemon with databases from XXXXXX -mysql daemon ended -@end example - -In this case, you should examine the log file very carefully! The log -should be located in the directory @file{XXXXXX} named by the error message, -and should indicate why @code{mysqld} didn't start. If you don't understand -what happened, include the log when you post a bug report using -@code{mysqlbug}! -@xref{Bug reports}. - -@item There is already a @code{mysqld} daemon running - -In this case, you probably don't have to run @code{mysql_install_db} at -all. You have to run @code{mysql_install_db} only once, when you install -MySQL the first time. - -@item Installing a second @code{mysqld} daemon doesn't work when one daemon is running - -This can happen when you already have an existing MySQL -installation, but want to put a new installation in a different place (for -example, for testing, or perhaps you simply want to run two installations at -the same time). Generally the problem that occurs when you try to run the -second server is that it tries to use the same socket and port as the old one. -In this case you will get the error message: @code{Can't start server: Bind on -TCP/IP port: Address already in use} or @code{Can't start server: Bind on -unix socket...}. @xref{Installing many servers}. - -@item You don't have write access to @file{/tmp} -@cindex write access, tmp -@cindex temporary file, write access -@cindex files, @code{tmp} - -If you don't have write access to create a socket file at the default place -(in @file{/tmp}) or permission to create temporary files in @file{/tmp,} -you will get an error when running @code{mysql_install_db} or when -starting or using @code{mysqld}. - -You can specify a different socket and temporary directory as follows: - -@tindex TMPDIR environment variable -@tindex MYSQL_UNIX_PORT environment variable -@tindex Environment variable, TMPDIR -@tindex Environment variable, MYSQL_UNIX_PORT -@example -shell> TMPDIR=/some_tmp_dir/ -shell> MYSQL_UNIX_PORT=/some_tmp_dir/mysqld.sock -shell> export TMPDIR MYSQL_UNIX_PORT -@end example - -See @ref{Problems with mysql.sock}. - -@file{some_tmp_dir} should be the path to some directory for which you -have write permission. @xref{Environment variables}. - -After this you should be able to run @code{mysql_install_db} and start -the server with these commands: - -@example -shell> scripts/mysql_install_db -shell> BINDIR/safe_mysqld & -@end example - -@item @code{mysqld} crashes immediately - -If you are running RedHat Version 5.0 with a version of @code{glibc} older than -2.0.7-5, you should make sure you have installed all @code{glibc} patches! -There is a lot of information about this in the MySQL mail -archives. Links to the mail archives are available online at -@uref{http://lists.mysql.com/}. -Also, see @ref{Linux}. - -You can also start @code{mysqld} manually using the @code{--skip-grant-tables} -option and add the privilege information yourself using @code{mysql}: - -@example -shell> BINDIR/safe_mysqld --skip-grant-tables & -shell> BINDIR/mysql -u root mysql -@end example - -From @code{mysql}, manually execute the SQL commands in -@code{mysql_install_db}. Make sure you run @code{mysqladmin -flush-privileges} or @code{mysqladmin reload} afterward to tell the server to -reload the grant tables. -@end table - - -@node Starting server, Automatic start, mysql_install_db, Post-installation -@subsection Problems Starting the MySQL Server -@cindex server, starting problems -@cindex problems, starting the server - -If you are going to use tables that support transactions (InnoDB, BDB), -you should first create a @file{my.cnf} file and set startup options -for the table types you plan to use. @xref{Table types}. - -Generally, you start the @code{mysqld} server in one of these ways: - -@itemize @bullet -@item -By invoking @code{mysql.server}. This script is used primarily at -system startup and shutdown, and is described more fully in -@ref{Automatic start}. - -@item -By invoking @code{safe_mysqld}, which tries to determine the proper options -for @code{mysqld} and then runs it with those options. @xref{safe_mysqld, , -@code{safe_mysqld}}. - -@item -For Windows NT/2000/XP, please see @ref{NT start}. - -@item -By invoking @code{mysqld} directly. -@end itemize - -When the @code{mysqld} daemon starts up, it changes the directory to the -data directory. This is where it expects to write log files and the pid -(process ID) file, and where it expects to find databases. - -The data directory location is hardwired in when the distribution is -compiled. However, if @code{mysqld} expects to find the data directory -somewhere other than where it really is on your system, it will not work -properly. If you have problems with incorrect paths, you can find out -what options @code{mysqld} allows and what the default path settings are by -invoking @code{mysqld} with the @code{--help} option. You can override the -defaults by specifying the correct pathnames as command-line arguments to -@code{mysqld}. (These options can be used with @code{safe_mysqld} as well.) - -Normally you should need to tell @code{mysqld} only the base directory under -which MySQL is installed. You can do this with the @code{--basedir} -option. You can also use @code{--help} to check the effect of changing path -options (note that @code{--help} @strong{must} be the final option of the -@code{mysqld} command). For example: - -@example -shell> EXECDIR/mysqld --basedir=/usr/local --help -@end example - -Once you determine the path settings you want, start the server without -the @code{--help} option. - -Whichever method you use to start the server, if it fails to start up -correctly, check the log file to see if you can find out why. Log files -are located in the data directory (typically -@file{/usr/local/mysql/data} for a binary distribution, -@file{/usr/local/var} for a source distribution, and -@file{\mysql\data\mysql.err} on Windows). Look in the data directory for -files with names of the form @file{host_name.err} and -@file{host_name.log} where @code{host_name} is the name of your server -host. Then check the last few lines of these files: - -@example -shell> tail host_name.err -shell> tail host_name.log -@end example - -Look for something like the following in the log file: -@example -000729 14:50:10 bdb: Recovery function for LSN 1 27595 failed -000729 14:50:10 bdb: warning: ./test/t1.db: No such file or directory -000729 14:50:10 Can't init databases -@end example - -This means that you didn't start @code{mysqld} with @code{--bdb-no-recover} -and Berkeley DB found something wrong with its log files when it -tried to recover your databases. To be able to continue, you should -move away the old Berkeley DB log file from the database directory to -some other place, where you can later examine it. The log files are -named @file{log.0000000001}, where the number will increase over time. - -If you are running @code{mysqld} with BDB table support and @code{mysqld} core -dumps at start this could be because of some problems with the BDB -recover log. In this case you can try starting @code{mysqld} with -@code{--bdb-no-recover}. If this helps, then you should remove all -@file{log.*} files from the data directory and try starting @code{mysqld} -again. - -If you get the following error, it means that some other program (or another -@code{mysqld} server) is already using the TCP/IP port or socket -@code{mysqld} is trying to use: - -@example -Can't start server: Bind on TCP/IP port: Address already in use - or -Can't start server : Bind on unix socket... -@end example - -Use @code{ps} to make sure that you don't have another @code{mysqld} server -running. If you can't find another server running, you can try to execute -the command @code{telnet your-host-name tcp-ip-port-number} and press -Enter a couple of times. If you don't get an error message like -@code{telnet: Unable to connect to remote host: Connection refused}, -something is using the TCP/IP port @code{mysqld} is trying to use. -See @ref{mysql_install_db} and @ref{Multiple servers}. - -If @code{mysqld} is currently running, you can find out what path settings -it is using by executing this command: - -@example -shell> mysqladmin variables -@end example - -or - -@example -shell> mysqladmin -h 'your-host-name' variables -@end example - -If you get @code{Errcode 13}, which means @code{Permission denied}, when -starting @code{mysqld} this means that you didn't have the right to -read/create files in the MySQL database or log directory. In this case -you should either start @code{mysqld} as the root user or change the -permissions for the involved files and directories so that you have the -right to use them. - -If @code{safe_mysqld} starts the server but you can't connect to it, -you should make sure you have an entry in @file{/etc/hosts} that looks like -this: - -@example -127.0.0.1 localhost -@end example - -This problem occurs only on systems that don't have a working thread -library and for which MySQL must be configured to use MIT-pthreads. - -If you can't get @code{mysqld} to start you can try to make a trace file -to find the problem. @xref{Making trace files}. - -If you are using InnoDB tables, refer to the InnoDB-specific startup -options. @xref{InnoDB start}. - -If you are using BDB (Berkeley DB) tables, you should familiarise -yourself with the different BDB-specific startup options. @xref{BDB start}. - - -@node Automatic start, , Starting server, Post-installation -@subsection Starting and Stopping MySQL Automatically - -@cindex starting, the server automatically -@cindex stopping, the server -@cindex server, starting and stopping - -The @code{mysql.server} and @code{safe_mysqld} scripts can be used to start -the server automatically at system startup time. @code{mysql.server} can also -be used to stop the server. - -The @code{mysql.server} script can be used to start or stop the server -by invoking it with @code{start} or @code{stop} arguments: - -@example -shell> mysql.server start -shell> mysql.server stop -@end example - -@code{mysql.server} can be found in the @file{share/mysql} directory -under the MySQL installation directory or in the @file{support-files} -directory of the MySQL source tree. - -Before @code{mysql.server} starts the server, it changes the directory to -the MySQL installation directory, then invokes @code{safe_mysqld}. -You might need to edit @code{mysql.server} if you have a binary distribution -that you've installed in a non-standard location. Modify it to @code{cd} -into the proper directory before it runs @code{safe_mysqld}. If you want the -server to run as some specific user, add an appropriate @code{user} line -to the @file{/etc/my.cnf} file, as shown later in this section. - -@code{mysql.server stop} brings down the server by sending a signal to it. -You can take down the server manually by executing @code{mysqladmin shutdown}. - -You might want to add these start and stop commands to the appropriate places -in your @file{/etc/rc*} files when you start using MySQL for -production applications. Note that if you modify @code{mysql.server}, and then -upgrade MySQL sometime, your modified version will be overwritten, -so you should make a copy of your edited version that you can reinstall. - -If your system uses @file{/etc/rc.local} to start external scripts, you -should append the following to it: -@example -/bin/sh -c 'cd /usr/local/mysql ; ./bin/safe_mysqld --user=mysql &' -@end example - -@cindex changing socket location -You can also add options for @code{mysql.server} in a global -@file{/etc/my.cnf} file. A typical @file{/etc/my.cnf} file might look like -this: - -@example -[mysqld] -datadir=/usr/local/mysql/var -socket=/var/tmp/mysql.sock -port=3306 -user=mysql - -[mysql.server] -basedir=/usr/local/mysql -@end example - -The @code{mysql.server} script understands the following options: -@code{datadir}, @code{basedir}, and @code{pid-file}. - -The following table shows which option groups each of the startup scripts -read from option files: - -@multitable @columnfractions .15 .35 -@item @strong{Script} @tab @strong{Option groups} -@item @code{mysqld} @tab @code{mysqld} and @code{server} -@item @code{mysql.server} @tab @code{mysql.server}, @code{mysqld}, and @code{server} -@item @code{safe_mysqld} @tab @code{mysql.server}, @code{mysqld}, and @code{server} -@end multitable - -@xref{Option files}. - - -@node Upgrade, Operating System Specific Notes, Post-installation, Installing -@section Upgrading/Downgrading MySQL - -@cindex upgrading -@cindex downgrading - -You can always move the MySQL form and datafiles between -different versions on the same architecture as long as you have the same -base version of MySQL. The current base version is -3. If you change the character set when running MySQL (which may -also change the sort order), you must run @code{myisamchk -r -q} on all -tables. Otherwise, your indexes may not be ordered correctly. - -If you are afraid of new versions, you can always rename your old -@code{mysqld} to something like @code{mysqld-old-version-number}. If -your new @code{mysqld} then does something unexpected, you can simply shut it -down and restart with your old @code{mysqld}! - -When you do an upgrade you should also back up your old databases, of course. - -If after an upgrade, you experience problems with recompiled client programs, -like @code{Commands out of sync} or unexpected core dumps, you probably have -used an old header or library file when compiling your programs. In this -case you should check the date for your @file{mysql.h} file and -@file{libmysqlclient.a} library to verify that they are from the new -MySQL distribution. If not, please recompile your programs! - -If you get some problems that the new @code{mysqld} server doesn't want to -start or that you can't connect without a password, check that you don't -have some old @file{my.cnf} file from your old installation! You can -check this with: @code{program-name --print-defaults}. If this outputs -anything other than the program name, you have an active @file{my.cnf} -file that will affect things! - -It is a good idea to rebuild and reinstall the @code{Msql-Mysql-modules} -distribution whenever you install a new release of MySQL, -particularly if you notice symptoms such as all your @code{DBI} scripts -dumping core after you upgrade MySQL. - -@menu -* Upgrading-from-3.23:: Upgrading from a 3.23 version to 4.0 -* Upgrading-from-3.22:: Upgrading from a 3.22 version to 3.23 -* Upgrading-from-3.21:: Upgrading from a 3.21 version to 3.22 -* Upgrading-from-3.20:: Upgrading from a 3.20 version to 3.21 -* Upgrading-to-arch:: Upgrading to another architecture -@end menu - -@cindex compatibility, between MySQL versions -@cindex upgrading, 3.23 to 4.0 -@node Upgrading-from-3.23, Upgrading-from-3.22, Upgrade, Upgrade -@subsection Upgrading From Version 3.23 to Version 4.0 - -In general what you have to do when upgrading to 4.0 from an earlier -MySQL version: - -@itemize -@item -Run the @code{mysql_fix_privilege_tables} to add new privileges and features -to the MySQL privilege tables. -@item -Edit any MySQL startup scripts or configure files to not use any of the -deprecated options listed below. -@item -Convert your old ISAM files to MyISAM files with the command: -@code{mysql_convert_table_format database}. Note that this should only -be run if all tables in the given database is ISAM or MyISAM tables. If -this is not the case you should run @code{ALTER TABLE table_name TYPE=MyISAM} -on all ISAM tables. -@item -Ensure that you don't have any MySQL clients that uses shared libraries -(like the perl Msql-Mysql-modules). If you have, you should recompile -them as structures used in @file{libmysqlclient.so} have changed. -@end itemize - -MySQL 4.0 will work even if you don't do the above, but you will not be -able to use the new security privileges that MySQL 4.0 and you may run -into problems when upgrading later to MySQL 4.1 or newer. The ISAM file -format still works in MySQL 4.0 but it's deprecated and will be disabled -in MySQL 5.0. - -Old clients should work with a Version 4.0 server without any problems. - -Even if you do the above, you can still downgrade to MySQL 3.23.52 or newer -if you run into problems with the MySQL 4.0 series. In this case you have -to do a mysqldump of any tables using a fulltext index and restore these -in 3.23 (because 4.0 uses a new format for fulltext index). - -The following is a more complete lists tell what you have to watch out -for when upgrading to version 4.0; - -@itemize @bullet -@item -MySQL 4.0 has a lot of new privileges in the @code{mysql.user} table. -@xref{GRANT}. - -To get these new privileges to work, one must run the -@code{mysql_fix_privilege_tables} script. Until this script is run all -users have the @code{SHOW DATABASES}, @code{CREATE TEMPORARY TABLES}, -and @code{LOCK TABLES} privileges. @code{SUPER} and @code{EXECUTE} -privileges take their value from @code{PROCESS}. -@code{REPLICATION SLAVE} and @code{REPLICATION CLIENT} take their -values from @code{FILE}. - -If you have any scripts that creates new users, you may want to change -them to use the new privileges. If you are not using @code{GRANT} -commands in the scripts, this is a good time to change your scripts. - -In version 4.0.2 the option @code{--safe-show-database} is deprecated -(and no longer does anything). @xref{Privileges options}. - -If you get access denied errors for new users in version 4.0.2, you -should check if you need some of the new grants that you didn't need -before. In particular, you will need @code{REPLICATION SLAVE} -(instead of @code{FILE}) for new slaves. -@item -The startup parameters @code{myisam_max_extra_sort_file_size} and -@code{myisam_max_extra_sort_file_size} are now given in bytes -(was megabytes before 4.0.3). -External system locking of MyISAM/ISAM files is now turned off by default. -One can turn this on by doing @code{--external-locking}. (For most users -this is never needed). -@item -The following startup variables/options have been renamed: -@multitable @columnfractions .50 .50 -@item @strong{From} @tab @strong{to}. -@item @code{myisam_bulk_insert_tree_size} @tab @code{bulk_insert_buffer_size} -@item @code{query_cache_startup_type} @tab @code{query_cache_type} -@item @code{record_buffer} @tab @code{read_buffer_size} -@item @code{record_rnd_buffer} @tab @code{read_rnd_buffer_size} -@item @code{sort_buffer} @tab @code{sort_buffer_size} -@item @code{warnings} @tab @code{log-warnings} -@end multitable - -The startup options @code{record_buffer}, @code{sort_buffer} and -@code{warnings} will still work in MySQL 4.0 but are deprecated. -@item -The mysqld option @code{--safe_show_database} doesn't work anymore. One -should instead give the @code{SHOW DATABASES} privileges to everyone that -need to see all databases. -@item -The following SQL variables have changed name. -@c arjen note: New table, not yet measured for O'Reilly/DocBook. -@multitable @columnfractions .50 .50 -@item @strong{From} @tab @strong{To}. -@item @code{SQL_BIG_TABLES} @tab @code{BIG_TABLES} -@item @code{SQL_LOW_PRIORITY_UPDATES} @tab @code{LOW_PRIORITY_UPDATES} -@item @code{SQL_MAX_JOIN_SIZE} @tab @code{MAX_JOIN_SIZE} -@item @code{SQL_QUERY_CACHE_TYPE} @tab @code{QUERY_CACHE_TYPE} -@end multitable -The old names still work in MySQL 4.0 but are deprecated. -@item -You have to use @code{SET GLOBAL SQL_SLAVE_SKIP_COUNTER=#} instead of -@code{SET SQL_SLAVE_SKIP_COUNTER=#}. -@item -Renamed mysqld startup options @code{--skip-locking} to -@code{--skip-external-locking} and @code{--enable-locking} to -@code{--external-locking}. -@item -@code{SHOW MASTER STATUS} now returns an empty set if binary log is not -enabled. -@item -@code{SHOW SLAVE STATUS} now returns an empty set if slave is not initialised. -@item -mysqld now has the option @code{--temp-pool} enabled by default as this -gives better performance with some OS. -@item -@code{DOUBLE} and @code{FLOAT} columns now honour the -@code{UNSIGNED} flag on storage (before, @code{UNSIGNED} was ignored for -these columns). -@item -@code{ORDER BY column DESC} now always sorts @code{NULL} values -first; in 3.23 this was not always consistent. -@item -@code{SHOW INDEX} has 2 columns more (@code{Null} and @code{Index_type}) -than it had in 3.23. -@item -@code{SIGNED} is a reserved word. -@item -The result of all bitwise operators @code{|}, @code{&}, @code{<<}, -@code{>>}, and @code{~} is now unsigned. This may cause problems if you -are using them in a context where you want a signed result. -@xref{Cast Functions}. -@item -@strong{Note}: when you use subtraction between integer values where -one is of type @code{UNSIGNED}, the result will be unsigned! In other -words, before upgrading to MySQL 4.0, you should check your application -for cases where you are subtracting a value from an unsigned entity and -want a negative answer or subtracting an unsigned value from an -integer column. You can disable this behaviour by using the -@code{--sql-mode=NO_UNSIGNED_SUBTRACTION} option when starting -@code{mysqld}. @xref{Cast Functions}. -@item -To use @code{MATCH ... AGAINST (... IN BOOLEAN MODE)} with your tables, -you need to rebuild them with @code{ALTER TABLE table_name TYPE=MyISAM}, -@strong{even} if they are of @code{MyISAM} type. -@item -@code{LOCATE()} and @code{INSTR()} are case-sensitive if one of the -arguments is a binary string. Otherwise they are case-insensitive. -@item -@code{STRCMP()} now uses the current character set when doing comparisons, -which means that the default comparison behaviour now is case-insensitive. -@item -@code{HEX(string)} now returns the characters in string converted to -hexadecimal. If you want to convert a number to hexadecimal, you should -ensure that you call @code{HEX()} with a numeric argument. -@item -In 3.23, @code{INSERT INTO ... SELECT} always had @code{IGNORE} enabled. -In 4.0.1, MySQL will stop (and possibly roll back) in case of an error if you -don't specify @code{IGNORE}. -@item -@file{safe_mysqld} is renamed to @file{mysqld_safe}. For some time we -will in our binary distributions include @code{safe_mysqld} as a symlink to -@code{mysqld_safe}. -@item -The old C API functions @code{mysql_drop_db}, @code{mysql_create_db}, and -@code{mysql_connect} are not supported anymore, unless you compile -MySQL with @code{CFLAGS=-DUSE_OLD_FUNCTIONS}. Instead of doing this, -it is preferable to change the client to use the new 4.0 API. -@item -In the @code{MYSQL_FIELD} structure, @code{length} and @code{max_length} have -changed from @code{unsigned int} to @code{unsigned long}. This should not -cause any problems, except that they may generate warning messages when -used as arguments in the @code{printf()} class of functions. -@item -You should use @code{TRUNCATE TABLE} when you want to delete all rows -from a table and you don't care how many rows were deleted. -(Because @code{TRUNCATE TABLE} is faster than @code{DELETE FROM table_name}). -@item -You will get an error if you have an active @code{LOCK TABLES} or -transaction when trying to execute @code{TRUNCATE TABLE} or @code{DROP -DATABASE}. -@item -You should use integers to store values in BIGINT columns (instead of using -strings, as you did in MySQL 3.23). Using strings will still work, but using -integers is more efficient. -@item -Format of @code{SHOW OPEN TABLE} has changed. -@item -Multi-threaded clients should use @code{mysql_thread_init()} and -@code{mysql_thread_end()}. @xref{Threaded clients}. -@item -If you want to recompile the Perl DBD::mysql module, you must get -Msql-Mysql-modules version 1.2218 or newer because the older DBD modules -used the deprecated @code{drop_db()} call. -@item -@code{RAND(seed)} returns a different random number series in 4.0 than in -3.23; this was done to further differentiate @code{RAND(seed)} and @code{RAND(seed+1)}. -@end itemize - -@node Upgrading-from-3.22, Upgrading-from-3.21, Upgrading-from-3.23, Upgrade -@subsection Upgrading From Version 3.22 to Version 3.23 - -@cindex compatibility, between MySQL versions -@cindex upgrading, 3.22 to 3.23 - -MySQL Version 3.23 supports tables of the new @code{MyISAM} type and -the old @code{ISAM} type. You don't have to convert your old tables to -use these with Version 3.23. By default, all new tables will be created with -type @code{MyISAM} (unless you start @code{mysqld} with the -@code{--default-table-type=isam} option). You can change an @code{ISAM} -table to a @code{MyISAM} table with @code{ALTER TABLE table_name TYPE=MyISAM} -or the Perl script @code{mysql_convert_table_format}. - -Version 3.22 and 3.21 clients will work without any problems with a Version -3.23 server. - -The following list tells what you have to watch out for when upgrading to -Version 3.23: - -@itemize @bullet -@item -All tables that use the @code{tis620} character set must be fixed -with @code{myisamchk -r} or @code{REPAIR TABLE}. - -@item -If you do a @code{DROP DATABASE} on a symbolic linked database, both the -link and the original database are deleted. (This didn't happen in 3.22 -because configure didn't detect the @code{readlink} system call.) - -@item -@code{OPTIMIZE TABLE} now works only for @code{MyISAM} tables. -For other table types, you can use @code{ALTER TABLE} to optimise the table. -During @code{OPTIMIZE TABLE} the table is now locked from other threads. - -@item -The MySQL client @code{mysql} is now by default started with the -option @code{--no-named-commands (-g)}. This option can be disabled with -@code{--enable-named-commands (-G)}. This may cause incompatibility problems in -some cases@-for example, in SQL scripts that use named commands without a -semicolon! Long format commands still work from the first line. - -@item -Date functions that work on parts of dates (like @code{MONTH()}) will now -return 0 for @code{0000-00-00} dates. (MySQL 3.22 returned @code{NULL}.) - -@item -If you are using the @code{german} character sort order, you must repair -all your tables with @code{isamchk -r}, as we have made some changes in -the sort order! - -@item -The default return type of @code{IF} will now depend on both arguments -and not only the first argument. - -@item -@code{AUTO_INCREMENT} will not work with negative numbers. The reason -for this is that negative numbers caused problems when wrapping from -1 to 0. -@code{AUTO_INCREMENT} for MyISAM tables is now handled at a lower level and -is much faster than before. For MyISAM tables old numbers are also not reused -anymore, even if you delete some rows from the table. - -@item -@code{CASE}, @code{DELAYED}, @code{ELSE}, @code{END}, @code{FULLTEXT}, -@code{INNER}, @code{RIGHT}, @code{THEN}, and @code{WHEN} are now reserved words. - -@item -@code{FLOAT(X)} is now a true floating-point type and not a value with a -fixed number of decimals. - -@item -When declaring @code{DECIMAL(length,dec)} the length argument no longer -includes a place for the sign or the decimal point. - -@item -A @code{TIME} string must now be of one of the following formats: -@code{[[[DAYS] [H]H:]MM:]SS[.fraction]} or -@code{[[[[[H]H]H]H]MM]SS[.fraction]}. - -@item -@code{LIKE} now compares strings using the same character comparison rules -as @code{=}. If you require the old behaviour, you can compile -MySQL with the @code{CXXFLAGS=-DLIKE_CMP_TOUPPER} flag. - -@item -@code{REGEXP} is now case-insensitive for normal (not binary) strings. - -@item -When you check/repair tables you should use @code{CHECK TABLE} -or @code{myisamchk} for @code{MyISAM} tables (@file{.MYI}) and -@code{isamchk} for ISAM (@file{.ISM}) tables. - -@item -If you want your @code{mysqldump} files to be compatible between -MySQL Version 3.22 and Version 3.23, you should not use the -@code{--opt} or @code{--all} option to @code{mysqldump}. - -@item -Check all your calls to @code{DATE_FORMAT()} to make sure there is a -@samp{%} before each format character. -(MySQL Version 3.22 and later already allowed this syntax.) - -@item -@code{mysql_fetch_fields_direct} is now a function (it was a macro) and -it returns a pointer to a @code{MYSQL_FIELD} instead of a -@code{MYSQL_FIELD}. - -@item -@code{mysql_num_fields()} can no longer be used on a @code{MYSQL*} object (it's -now a function that takes @code{MYSQL_RES*} as an argument, so you should -use @code{mysql_field_count()} instead). - -@item -In MySQL Version 3.22, the output of @code{SELECT DISTINCT ...} was -almost always sorted. In Version 3.23, you must use @code{GROUP BY} or -@code{ORDER BY} to obtain sorted output. - -@item -@code{SUM()} now returns @code{NULL}, instead of 0, if -there are no matching rows. This is according to ANSI SQL. - -@item -An @code{AND} or @code{OR} with @code{NULL} values will now return -@code{NULL} instead of 0. This mostly affects queries that use @code{NOT} -on an @code{AND/OR} expression as @code{NOT NULL} = @code{NULL}. -@code{LPAD()} and @code{RPAD()} will shorten the result string if it's longer -than the length argument. -@end itemize - - -@node Upgrading-from-3.21, Upgrading-from-3.20, Upgrading-from-3.22, Upgrade -@subsection Upgrading from Version 3.21 to Version 3.22 - -@cindex compatibility, between MySQL versions -@cindex upgrading, 3.21 to 3.22 - -Nothing that affects compatibility has changed between versions 3.21 and 3.22. -The only pitfall is that new tables that are created with @code{DATE} type -columns will use the new way to store the date. You can't access these new -fields from an old version of @code{mysqld}. - -After installing MySQL Version 3.22, you should start the new server -and then run the @code{mysql_fix_privilege_tables} script. This will add the -new privileges that you need to use the @code{GRANT} command. If you forget -this, you will get @code{Access denied} when you try to use @code{ALTER -TABLE}, @code{CREATE INDEX}, or @code{DROP INDEX}. If your MySQL root -user requires a password, you should give this as an argument to -@code{mysql_fix_privilege_tables}. - -The C API interface to @code{mysql_real_connect()} has changed. If you have -an old client program that calls this function, you must place a @code{0} for -the new @code{db} argument (or recode the client to send the @code{db} -element for faster connections). You must also call @code{mysql_init()} -before calling @code{mysql_real_connect()}! This change was done to allow -the new @code{mysql_options()} function to save options in the @code{MYSQL} -handler structure. - -The @code{mysqld} variable @code{key_buffer} has changed names to -@code{key_buffer_size}, but you can still use the old name in your -startup files. - - -@node Upgrading-from-3.20, Upgrading-to-arch, Upgrading-from-3.21, Upgrade -@subsection Upgrading from Version 3.20 to Version 3.21 - -@cindex upgrading, 3.20 to 3.21 - -If you are running a version older than Version 3.20.28 and want to -switch to Version 3.21, you need to do the following: - -You can start the @code{mysqld} Version 3.21 server with @code{safe_mysqld ---old-protocol} to use it with clients from a Version 3.20 distribution. -In this case, the new client function @code{mysql_errno()} will not -return any server error, only @code{CR_UNKNOWN_ERROR} (but it -works for client errors), and the server uses the old @code{password()} -checking rather than the new one. - -If you are @strong{not} using the @code{--old-protocol} option to -@code{mysqld}, you will need to make the following changes: - -@itemize @bullet -@item -All client code must be recompiled. If you are using ODBC, you must get -the new @code{MyODBC} 2.x driver. -@item -The script @code{scripts/add_long_password} must be run to convert the -@code{Password} field in the @code{mysql.user} table to @code{CHAR(16)}. -@item -All passwords must be reassigned in the @code{mysql.user} table (to get 62-bit -rather than 31-bit passwords). -@item -The table format hasn't changed, so you don't have to convert any tables. -@end itemize - -MySQL Version 3.20.28 and above can handle the new @code{user} table -format without affecting clients. If you have a MySQL version earlier -than Version 3.20.28, passwords will no longer work with it if you convert the -@code{user} table. So to be safe, you should first upgrade to at least Version -3.20.28 and then upgrade to Version 3.21. - -@cindex Protocol mismatch -The new client code works with a 3.20.x @code{mysqld} server, so -if you experience problems with 3.21.x, you can use the old 3.20.x server -without having to recompile the clients again. - -If you are not using the @code{--old-protocol} option to @code{mysqld}, -old clients will issue the error message: - -@example -ERROR: Protocol mismatch. Server Version = 10 Client Version = 9 -@end example - -The new Perl @code{DBI}/@code{DBD} interface also supports the old -@code{mysqlperl} interface. The only change you have to make if you use -@code{mysqlperl} is to change the arguments to the @code{connect()} function. -The new arguments are: @code{host}, @code{database}, @code{user}, -and @code{password} (the @code{user} and @code{password} arguments have changed -places). -@xref{Perl DBI Class, , Perl @code{DBI} Class}. - -The following changes may affect queries in old applications: - -@itemize @bullet -@item -@code{HAVING} must now be specified before any @code{ORDER BY} clause. -@item -The parameters to @code{LOCATE()} have been swapped. -@item -There are some new reserved words. The most notable are @code{DATE}, -@code{TIME}, and @code{TIMESTAMP}. -@end itemize - - -@node Upgrading-to-arch, , Upgrading-from-3.20, Upgrade -@subsection Upgrading to Another Architecture - -@cindex upgrading, different architecture - -If you are using MySQL Version 3.23, you can copy the @file{.frm}, -@file{.MYI}, and @file{.MYD} files between different architectures that -support the same floating-point format. (MySQL takes care of any -byte-swapping issues.) - -The MySQL @code{ISAM} data and index files (@file{.ISD} and -@file{*.ISM}, respectively) are architecture-dependent and in some cases -OS-dependent. If you want to move your applications to another machine -that has a different architecture or OS than your current machine, you -should not try to move a database by simply copying the files to the -other machine. Use @code{mysqldump} instead. - -By default, @code{mysqldump} will create a file full of SQL statements. -You can then transfer the file to the other machine and feed it as input -to the @code{mysql} client. - -Try @code{mysqldump --help} to see what options are available. -If you are moving the data to a newer version of MySQL, you should use -@code{mysqldump --opt} with the newer version to get a fast, compact dump. - -The easiest (although not the fastest) way to move a database between two -machines is to run the following commands on the machine on which the -database is located: - -@example -shell> mysqladmin -h 'other hostname' create db_name -shell> mysqldump --opt db_name \ - | mysql -h 'other hostname' db_name -@end example - -If you want to copy a database from a remote machine over a slow network, -you can use: - -@example -shell> mysqladmin create db_name -shell> mysqldump -h 'other hostname' --opt --compress db_name \ - | mysql db_name -@end example - -You can also store the result in a file, then transfer the file to the -target machine and load the file into the database there. For example, -you can dump a database to a file on the source machine like this: - -@example -shell> mysqldump --quick db_name | gzip > db_name.contents.gz -@end example - -(The file created in this example is compressed.) Transfer the file -containing the database contents to the target machine and run these commands -there: - -@example -shell> mysqladmin create db_name -shell> gunzip < db_name.contents.gz | mysql db_name -@end example - -@cindex @code{mysqldump} -@cindex @code{mysqlimport} -You can also use @code{mysqldump} and @code{mysqlimport} to accomplish -the database transfer. -For big tables, this is much faster than simply using @code{mysqldump}. -In the following commands, @code{DUMPDIR} represents the full pathname -of the directory you use to store the output from @code{mysqldump}. - -First, create the directory for the output files and dump the database: - -@example -shell> mkdir DUMPDIR -shell> mysqldump --tab=DUMPDIR db_name -@end example - -Then transfer the files in the @code{DUMPDIR} directory to some corresponding -directory on the target machine and load the files into MySQL -there: - -@example -shell> mysqladmin create db_name # create database -shell> cat DUMPDIR/*.sql | mysql db_name # create tables in database -shell> mysqlimport db_name DUMPDIR/*.txt # load data into tables -@end example - -Also, don't forget to copy the @code{mysql} database because that's where the -grant tables (@code{user}, @code{db}, @code{host}) are stored. You may have -to run commands as the MySQL @code{root} user on the new machine -until you have the @code{mysql} database in place. - -After you import the @code{mysql} database on the new machine, execute -@code{mysqladmin flush-privileges} so that the server reloads the grant table -information. - - -@node Operating System Specific Notes, Perl support, Upgrade, Installing -@section Operating System Specific Notes - -@menu -* Linux:: Linux Notes (All Linux Versions) -* Windows:: Windows Notes -* Solaris:: Solaris Notes -* BSD Notes:: BSD Notes -* Mac OS X:: Mac OS X Notes -* Other Unix Notes:: Other Unix Notes -* OS/2:: OS/2 Notes -* BeOS:: BeOS Notes -* Novell Netware:: Novell NetWare Notes -@end menu - - -@node Linux, Windows, Operating System Specific Notes, Operating System Specific Notes -@subsection Linux Notes (All Linux Versions) - -@menu -* Binary notes-Linux:: Linux Notes for Binary Distributions -* Linux-x86:: Linux x86 Notes -* Linux-SPARC:: Linux SPARC Notes -* Linux-Alpha:: Linux Alpha Notes -* Linux-PowerPC:: Linux PowerPC Notes -* Linux-MIPS:: Linux MIPS Notes -* Linux-IA64:: Linux IA64 Notes -@end menu - -The following notes regarding @code{glibc} apply only to the situation -when you build MySQL -yourself. If you are running Linux on an x86 machine, in most cases it is -much better for you to just use our binary. We link our binaries against -the best patched version of @code{glibc} we can come up with and with the -best compiler options, in an attempt to make it suitable for a high-load -server. So if you read the following text, and are in doubt about -what you should do, try our binary first to see if it meets your needs, and -worry about your own build only after you have discovered that our binary is -not good enough. In that case, we would appreciate a note about it, so we -can build a better binary next time. For a typical user, even for setups with -a lot of concurrent connections and/or tables exceeding the 2G limit, our -binary in most cases is the best choice. - -MySQL uses LinuxThreads on Linux. If you are using an old -Linux version that doesn't have @code{glibc2}, you must install -LinuxThreads before trying to compile MySQL. You can get -LinuxThreads at @uref{http://www.mysql.com/Downloads/Linux/}. - -@strong{Note}: we have seen some strange problems with Linux 2.2.14 and -MySQL on SMP systems. If you have a SMP system, we recommend -you upgrade to Linux 2.4 as soon as possible! Your system will be -faster and more stable by doing this! - -Note that @code{glibc} versions before and including Version 2.1.1 have -a fatal bug in @code{pthread_mutex_timedwait} handling, which is used -when you do @code{INSERT DELAYED}. We recommend that you not use -@code{INSERT DELAYED} before upgrading glibc. - -If you plan to have 1000+ concurrent connections, you will need to make -some changes to LinuxThreads, recompile it, and relink MySQL against -the new @file{libpthread.a}. Increase @code{PTHREAD_THREADS_MAX} in -@file{sysdeps/unix/sysv/linux/bits/local_lim.h} to 4096 and decrease -@code{STACK_SIZE} in @file{linuxthreads/internals.h} to 256 KB. The paths are -relative to the root of @code{glibc} Note that MySQL will not be -stable with around 600-1000 connections if @code{STACK_SIZE} is the default -of 2 MB. - -If MySQL can't open enough files, -or connections, it may be that you haven't configured Linux to handle -enough files. - -In Linux 2.2 and onward, you can check the number of allocated -file handlers by doing: - -@example -cat /proc/sys/fs/file-max -cat /proc/sys/fs/dquot-max -cat /proc/sys/fs/super-max -@end example - -If you have more than 16 MB of memory, you should add something like the -following to your init scripts (e.g. @file{/etc/init.d/boot.local} on SuSE Linux): - -@example -echo 65536 > /proc/sys/fs/file-max -echo 8192 > /proc/sys/fs/dquot-max -echo 1024 > /proc/sys/fs/super-max -@end example - -You can also run the preceding commands from the command-line as root, but -these settings will be lost the next time your computer reboots. - -Alternatively, you can set these parameters on bootup by using the -@code{sysctl} tool, which is used by many Linux distributions (SuSE has -added it as well, beginning with SuSE Linux 8.0). Just put the following -values into a file named @file{/etc/sysctl.conf}: - -@example -# Increase some values for MySQL -fs.file-max = 65536 -fs.dquot-max = 8192 -fs.super-max = 1024 -@end example - -You should also add the following to @file{/etc/my.cnf}: - -@example -[safe_mysqld] -open-files-limit=8192 -@end example - -This should allow MySQL to create up to 8192 connections + files. - -The @code{STACK_SIZE} constant in LinuxThreads controls the spacing of thread -stacks in the address space. It needs to be large enough so that there will -be plenty of room for the stack of each individual thread, but small enough -to keep the stack of some threads from running into the global @code{mysqld} -data. Unfortunately, the Linux implementation of @code{mmap()}, as we have -experimentally discovered, will successfully unmap an already mapped region -if you ask it to map out an address already in use, zeroing out the data -on the entire page, instead of returning an error. So, the safety of -@code{mysqld} or any other threaded application depends on the "gentleman" -behaviour of the code that creates threads. The user must take measures to -make sure the number of running threads at any time is sufficiently low for -thread stacks to stay away from the global heap. With @code{mysqld}, you -should enforce this "gentleman" behaviour by setting a reasonable value for -the @code{max_connections} variable. - -If you build MySQL yourself and do not want to mess with patching -LinuxThreads, you should set @code{max_connections} to a value no higher -than 500. It should be even less if you have a large key buffer, large -heap tables, or some other things that make @code{mysqld} allocate a lot -of memory, or if you are running a 2.2 kernel with a 2G patch. If you are -using our binary or RPM version 3.23.25 or later, you can safely set -@code{max_connections} at 1500, assuming no large key buffer or heap tables -with lots of data. The more you reduce @code{STACK_SIZE} in LinuxThreads -the more threads you can safely create. We recommend the values between -128K and 256K. - -If you use a lot of concurrent connections, you may suffer from a "feature" -in the 2.2 kernel that penalises a process for forking or cloning a child -in an attempt to prevent a fork bomb attack. This will cause MySQL -not to scale well as you increase the number of concurrent clients. On -single-CPU systems, we have seen this manifested in a very slow thread -creation, which means it may take a long time to connect to MySQL -(as long as 1 minute), and it may take just as long to shut it down. On -multiple-CPU systems, we have observed a gradual drop in query speed as -the number of clients increases. In the process of trying to find a -solution, we have received a kernel patch from one of our users, who -claimed it made a lot of difference for his site. The patch is available at -@uref{http://www.mysql.com/Downloads/Patches/linux-fork.patch}. We have -now done rather extensive testing of this patch on both development and -production systems. It has significantly -improved @code{MySQL} performance without causing any problems and we now -recommend it to our users who are still running high-load servers on -2.2 kernels. This issue has been fixed in the 2.4 kernel, so if you are not -satisfied with -the current performance of your system, rather than patching your 2.2 kernel, -it might be easier to just upgrade to 2.4, which will also give you a nice -SMP boost in addition to fixing this fairness bug. - -We have tested MySQL on the 2.4 kernel on a 2-CPU machine and -found MySQL scales @strong{much} better@-there was virtually no slowdown -on queries throughput all the way up -to 1000 clients, and the MySQL scaling factor (computed as the ratio of -maximum throughput to the throughput with one client) was 180%. -We have observed similar results on a 4-CPU system@-virtually no -slowdown as the number of -clients was increased up to 1000, and 300% scaling factor. So for a high-load -SMP server we would definitely recommend the 2.4 kernel at this point. We -have discovered that it is essential to run @code{mysqld} process with the -highest possible priority on the 2.4 kernel to achieve maximum performance. -This can be done by adding -@code{renice -20 $$} command to @code{safe_mysqld}. In our testing on a -4-CPU machine, increasing the priority gave 60% increase in throughput with -400 clients. - -We are currently also trying to collect -more info on how well @code{MySQL} performs on 2.4 kernel on 4-way and 8-way -systems. If you have access such a system and have done some benchmarks, -please send a mail to @email{docs@@mysql.com} with the results - we will -include them in the manual. - -There is another issue that greatly hurts MySQL performance, -especially on SMP systems. The implementation of mutex in -LinuxThreads in @code{glibc-2.1} is very bad for programs with many -threads that only -hold the mutex for a short time. On an SMP system, ironic as it is, if -you link MySQL against unmodified @code{LinuxThreads}, -removing processors from the machine improves MySQL performance -in many cases. We have made a patch available for @code{glibc 2.1.3} -to correct this behaviour -(@uref{http://www.mysql.com/Downloads/Linux/linuxthreads-2.1-patch}). - -With @code{glibc-2.2.2} -MySQL version 3.23.36 will use the adaptive mutex, which is much -better than even the patched one in @code{glibc-2.1.3}. Be warned, however, -that under some conditions, the current mutex code in @code{glibc-2.2.2} -overspins, which hurts MySQL performance. The chance of this -condition can be reduced by renicing @code{mysqld} process to the highest -priority. We have also been able to correct the overspin behaviour with -a patch, available at -@uref{http://www.mysql.com/Downloads/Linux/linuxthreads-2.2.2.patch}. -It combines the correction of overspin, maximum number of -threads, and stack spacing all in one. You will need to apply it in the -@code{linuxthreads} directory with -@code{patch -p0 </tmp/linuxthreads-2.2.2.patch}. -We hope it will be included in -some form in to the future releases of @code{glibc-2.2}. In any case, if -you link against @code{glibc-2.2.2} you still need to correct -@code{STACK_SIZE} and @code{PTHREAD_THREADS_MAX}. We hope that the defaults -will be corrected to some more acceptable values for high-load -MySQL setup in the future, so that your own build can be reduced -to @code{./configure; make; make install}. - -We recommend that you use the above patches to build a special static -version of @code{libpthread.a} and use it only for statically linking -against @code{MySQL}. We know that the patches are safe for @code{MySQL} -and significantly improve its performance, but we cannot say anything -about other applications. If you link other applications against the -patched version of the library, or build a patched shared version and -install it on your system, you are doing it at your own risk with regard -to other applications that depend on @code{LinuxThreads}. - -If you experience any strange problems during the installation of -MySQL, or with some common utilties hanging, it is very likely that -they are either library or compiler related. If this is the case, using our -binary will resolve them. - -One known problem with the binary distribution is that with older Linux -systems that use @code{libc} (like RedHat 4.x or Slackware), you will get -some non-fatal problems with hostname resolution. -@xref{Binary notes-Linux}. - -When using LinuxThreads you will see a minimum of three processes -running. These are in fact threads. There will be one thread for the -LinuxThreads manager, one thread to handle connections, and one thread -to handle alarms and signals. - -Note that the Linux kernel and the LinuxThread library can by default -only have 1024 threads. This means that you can only have up to 1021 -connections to MySQL on an unpatched system. The page -@uref{http://www.volano.com/linuxnotes.html} contains information how to -go around this limit. - -If you see a dead @code{mysqld} daemon process with @code{ps}, this usually -means that you have found a bug in MySQL or you have a corrupted -table. @xref{Crashing}. - -To get a core dump on Linux if @code{mysqld} dies with a @code{SIGSEGV} signal, -you can start @code{mysqld} with the @code{--core-file} option. Note -that you also probably need to raise the @code{core file size} by adding -@code{ulimit -c 1000000} to @code{safe_mysqld} or starting -@code{safe_mysqld} with @code{--core-file-size=1000000}. -@xref{safe_mysqld, , @code{safe_mysqld}}. - -If you are linking your own MySQL client and get the error: - -@example -ld.so.1: ./my: fatal: libmysqlclient.so.4: -open failed: No such file or directory -@end example - -When executing them, the problem can be avoided by one of the following -methods: - -@itemize @bullet -@item -Link the client with the following flag (instead of @code{-Lpath}): -@code{-Wl,r/path-libmysqlclient.so}. - -@item -Copy @code{libmysqclient.so} to @file{/usr/lib}. - -@tindex LD_RUN_PATH environment variable -@tindex environment variable, LD_RUN_PATH -@item -Add the pathname of the directory where @file{libmysqlclient.so} is located -to the @code{LD_RUN_PATH} environment variable before running your client. -@end itemize - -If you are using the Fujitsu compiler @code{(fcc / FCC)} you will have -some problems compiling MySQL because the Linux header files are very -@code{gcc} oriented. - -The following @code{configure} line should work with @code{fcc/FCC}: - -@example -CC=fcc CFLAGS="-O -K fast -K lib -K omitfp -Kpreex -D_GNU_SOURCE \ --DCONST=const -DNO_STRTOLL_PROTO" CXX=FCC CXXFLAGS="-O -K fast -K lib \ --K omitfp -K preex --no_exceptions --no_rtti -D_GNU_SOURCE -DCONST=const \ --Dalloca=__builtin_alloca -DNO_STRTOLL_PROTO \ -'-D_EXTERN_INLINE=static __inline'" ./configure --prefix=/usr/local/mysql \ ---enable-assembler --with-mysqld-ldflags=-all-static --disable-shared \ ---with-low-memory -@end example - - -@node Binary notes-Linux, Linux-x86, Linux, Linux -@subsubsection Linux Notes for Binary Distributions - -@cindex binary distributions, on Linux -@cindex Linux, binary distribution - -MySQL needs at least Linux Version 2.0. - -@strong{Warning}: -We have reports from some MySQL users that they have got serious -stability problems with MySQL with Linux kernel 2.2.14. If you are -using this kernel you should upgrade to 2.2.19 (or newer) or to a 2.4 -kernel. If you have a multi-cpu box, then you should seriously consider -using 2.4 as this will give you a significant speed boost. - -The binary release is linked with @code{-static}, which means you do not -normally need to worry about which version of the system libraries you -have. You need not install LinuxThreads, either. A program linked with -@code{-static} is slightly bigger than a dynamically linked program but -also slightly faster (3-5%). One problem, however, is that you can't use -user-definable functions (UDFs) with a statically linked program. If -you are going to write or use UDF functions (this is something only for -C or C++ programmers), you must compile MySQL yourself, using -dynamic linking. - -If you are using a @code{libc}-based system (instead of a @code{glibc2} -system), you will probably get some problems with hostname resolving and -@code{getpwnam()} with the binary release. (This is because @code{glibc} -unfortunately depends on some external libraries to resolve hostnames -and @code{getpwent()}, even when compiled with @code{-static}). In this -case you probably get the following error message when you run -@code{mysql_install_db}: - -@example -Sorry, the host 'xxxx' could not be looked up -@end example - -or the following error when you try to run @code{mysqld} with the @code{--user} -option: - -@example -getpwnam: No such file or directory -@end example - -You can solve this problem in one of the following ways: - -@itemize @bullet -@item -Get a MySQL source distribution (an RPM or the @code{tar.gz} -distribution) and install this instead. -@item -Execute @code{mysql_install_db --force}; this will not execute the -@code{resolveip} test in @code{mysql_install_db}. The downside is that -you can't use host names in the grant tables; you must use IP numbers -instead (except for @code{localhost}). If you are using an old MySQL -release that doesn't support @code{--force}, you have to remove the -@code{resolveip} test in @code{mysql_install} with an editor. -@item -Start @code{mysqld} with @code{su} instead of using @code{--user}. -@end itemize - -The Linux-Intel binary and RPM releases of MySQL are configured -for the highest possible speed. We are always trying to use the fastest -stable compiler available. - -MySQL Perl support requires Version Perl 5.004_03 or newer. - -On some Linux 2.2 versions, you may get the error @code{Resource -temporarily unavailable} when you do a lot of new connections to a -@code{mysqld} server over TCP/IP. - -The problem is that Linux has a delay between when you close a TCP/IP -socket and until this is actually freed by the system. As there is only -room for a finite number of TCP/IP slots, you will get the above error if -you try to do too many new TCP/IP connections during a small time, like -when you run the MySQL @file{test-connect} benchmark over -TCP/IP. - -We have mailed about this problem a couple of times to different Linux -mailing lists but have never been able to resolve this properly. - -The only known 'fix' to this problem is to use persistent connections in -your clients or use sockets, if you are running the database server -and clients on the same machine. We hope that the @code{Linux 2.4} -kernel will fix this problem in the future. - - -@node Linux-x86, Linux-SPARC, Binary notes-Linux, Linux -@subsubsection Linux x86 Notes - -MySQL requires @code{libc} Version 5.4.12 or newer. It's known to -work with @code{libc} 5.4.46. @code{glibc} Version 2.0.6 and later should -also work. There have been some problems with the @code{glibc} RPMs from -RedHat, so if you have problems, check whether there are any updates! -The @code{glibc} 2.0.7-19 and 2.0.7-29 RPMs are known to work. - -If you are using gcc 3.0 and above to compile MySQL, you must install -the @code{libstdc++v3} library before compiling MySQL; if you don't do -this you will get an error about a missing @code{__cxa_pure_virtual} -symbol during linking! - -On some older Linux distributions, @code{configure} may produce an error -like this: - -@example -Syntax error in sched.h. Change _P to __P in the /usr/include/sched.h file. -See the Installation chapter in the Reference Manual. -@end example - -Just do what the error message says and add an extra underscore to the -@code{_P} macro that has only one underscore, then try again. - -You may get some warnings when compiling; those shown here can be ignored: - -@example -mysqld.cc -o objs-thread/mysqld.o -mysqld.cc: In function `void init_signals()': -mysqld.cc:315: warning: assignment of negative value `-1' to -`long unsigned int' -mysqld.cc: In function `void * signal_hand(void *)': -mysqld.cc:346: warning: assignment of negative value `-1' to -`long unsigned int' -@end example - -In Debian GNU/Linux, if you want MySQL to start automatically when -the system boots, do the following: - -@example -shell> cp support-files/mysql.server /etc/init.d/mysql.server -shell> /usr/sbin/update-rc.d mysql.server defaults 99 -@end example - -@code{mysql.server} can be found in the @file{share/mysql} directory -under the MySQL installation directory or in the -@file{support-files} directory of the MySQL source tree. - -If @code{mysqld} always core dumps when it starts up, the problem may be that -you have an old @file{/lib/libc.a}. Try renaming it, then remove -@file{sql/mysqld} and do a new @code{make install} and try again. This -problem has been reported on some Slackware installations. - -If you get the following error when linking @code{mysqld}, -it means that your @file{libg++.a} is not installed correctly: - -@example -/usr/lib/libc.a(putc.o): In function `_IO_putc': -putc.o(.text+0x0): multiple definition of `_IO_putc' -@end example - -You can avoid using @file{libg++.a} by running @code{configure} like this: - -@example -shell> CXX=gcc ./configure -@end example - -@node Linux-SPARC, Linux-Alpha, Linux-x86, Linux -@subsubsection Linux SPARC Notes - -In some implementations, @code{readdir_r()} is broken. The symptom is that -@code{SHOW DATABASES} always returns an empty set. This can be fixed by -removing @code{HAVE_READDIR_R} from @file{config.h} after configuring and -before compiling. - -Some problems will require patching your Linux installation. The patch can -be found at -@uref{http://www.mysql.com/Downloads/patches/Linux-sparc-2.0.30.diff}. -This patch is against the Linux distribution @file{sparclinux-2.0.30.tar.gz} -that is available at @code{vger.rutgers.edu} (a version of Linux that was -never merged with the official 2.0.30). You must also install LinuxThreads -Version 0.6 or newer. - - -@node Linux-Alpha, Linux-PowerPC, Linux-SPARC, Linux -@subsubsection Linux Alpha Notes - -MySQL Version 3.23.12 is the first MySQL version that is -tested on Linux-Alpha. If you plan to use MySQL on Linux-Alpha, -you should ensure that you have this version or newer. - -We have tested MySQL on Alpha with our benchmarks and test suite, -and it appears to work nicely. - -We currently build the MySQL binary packages on SuSE Linux 7.0 for AXP, -kernel 2.4.4-SMP, Compaq C compiler (V6.2-505) and Compaq C++ compiler -(V6.3-006) on a Compaq DS20 machine with an Alpha EV6 processor. - -You can find the above compilers at -@uref{http://www.support.compaq.com/alpha-tools/}). By using these compilers, -instead of gcc, we get about 9-14% better performance with MySQL. - -Note that until MySQL version 3.23.52 and 4.0.2 we optimised the binary for -the current CPU only (by using the @code{-fast} compile option); this meant -that you could only use our binaries if you had an Alpha EV6 processor. - -Starting with all following releases we added the @code{-arch generic} flag -to our compile options, which makes sure the binary runs on all Alpha -processors. We also compile statically to avoid library problems. - -@example -CC=ccc CFLAGS="-fast -arch generic" CXX=cxx \ -CXXFLAGS="-fast -arch generic -noexceptions -nortti" \ -./configure --prefix=/usr/local/mysql --disable-shared \ ---with-extra-charsets=complex --enable-thread-safe-client \ ---with-mysqld-ldflags=-non_shared --with-client-ldflags=-non_shared -@end example - -If you want to use egcs the following configure line worked for us: - -@example -CFLAGS="-O3 -fomit-frame-pointer" CXX=gcc \ -CXXFLAGS="-O3 -fomit-frame-pointer -felide-constructors \ --fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql \ ---disable-shared -@end example - -Some known problems when running MySQL on Linux-Alpha: - -@itemize @bullet -@item -Debugging threaded applications like MySQL will not work with -@code{gdb 4.18}. You should download and use gdb 5.1 instead! - -@item -If you try linking @code{mysqld} statically when using @code{gcc}, the -resulting image will core dump at start. In other words, @strong{don't} -use @code{--with-mysqld-ldflags=-all-static} with @code{gcc}. -@end itemize - - -@node Linux-PowerPC, Linux-MIPS, Linux-Alpha, Linux -@subsubsection Linux PowerPC Notes - -MySQL should work on MkLinux with the newest @code{glibc} package -(tested with @code{glibc} 2.0.7). - - -@node Linux-MIPS, Linux-IA64, Linux-PowerPC, Linux -@subsubsection Linux MIPS Notes - -To get MySQL to work on Qube2, (Linux Mips), you need the -newest @code{glibc} libraries (@code{glibc-2.0.7-29C2} is known to -work). You must also use the @code{egcs} C++ compiler -(@code{egcs-1.0.2-9}, @code{gcc 2.95.2} or newer). - - -@node Linux-IA64, , Linux-MIPS, Linux -@subsubsection Linux IA64 Notes - -To get MySQL to compile on Linux IA64, we use the following compile line: -Using @code{gcc-2.96}: - -@example -CC=gcc CFLAGS="-O3 -fno-omit-frame-pointer" CXX=gcc \ -CXXFLAGS="-O3 -fno-omit-frame-pointer -felide-constructors \ --fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql \ -"--with-comment=Official MySQL binary" --with-extra-charsets=complex -@end example - -On IA64 the MySQL client binaries are using shared libraries. This means -that if you install our binary distribution in some other place than -@file{/usr/local/mysql} you need to either modify @file{/etc/ld.so.conf} -or add the path to the directory where you have @file{libmysqlclient.so} -to the @code{LD_LIBRARY_PATH} environment variable. - -@xref{Link errors}. - -@node Windows, Solaris, Linux, Operating System Specific Notes -@subsection Windows Notes - -This section describes using MySQL on Windows. This information -is also provided in the @file{README} file that comes with the -MySQL Windows distribution. @xref{Windows installation}. - -@menu -* Win95 start:: Starting MySQL on Windows 9x / Me -* NT start:: Starting MySQL on Windows NT / 2000 / XP -* Windows running:: Running MySQL on Windows -* Windows and SSH:: Connecting to a remote MySQL from Windows with SSH -* Windows symbolic links:: Splitting data across different disks under Win32 -* Windows client compiling:: Compiling MySQL clients on Windows. -* Windows vs Unix:: MySQL-Windows compared to Unix MySQL -@end menu - - -@node Win95 start, NT start, Windows, Windows -@subsubsection Starting MySQL on Windows 95, 98 or Me - -MySQL uses TCP/IP to connect a client to a server. (This will -allow any machine on your network to connect to your MySQL -server.) Because of this, you must install TCP/IP on your -machine before starting MySQL. You can find TCP/IP on your -Windows CD-ROM. - -Note that if you are using an old Windows 95 release (for example -OSR2), it's likely that you have an old Winsock package; -MySQL requires Winsock 2! You can get the newest Winsock from -@uref{http://www.microsoft.com/}. Windows 98 has the new Winsock 2 -library, so the above doesn't apply there. - -To start the @code{mysqld} server, you should start an MS-DOS -window and type: - -@example -C:\> C:\mysql\bin\mysqld -@end example - -This will start @code{mysqld} in the background without a window. - -You can kill the MySQL server by executing: - -@example -C:\> C:\mysql\bin\mysqladmin -u root shutdown -@end example - -This calls the MySQL administation utility as user `root', which -is the default Administrator in the MySQL grant system. Please -note that the MySQL grant system is wholly independent from any -login users under Windows. - -Note that Windows 95/98/Me don't support creation of named pipes. -So on those platforms, you can only use named pipes to connect to a -remote MySQL server running on a Windows NT/2000/XP server host. -(The MySQL server must also support named pipes, of course. -For example, using @code{mysqld-opt} under NT/2000/XP will not -allow named pipe connections. You should use either -@code{mysqld-nt} or @code{mysqld-max-nt}.) - -If @code{mysqld} doesn't start, please check the -@file{\mysql\data\mysql.err} file to see if the server wrote any -message there to indicate the cause of the problem. You can also -try to start the server with @code{mysqld --standalone}; in this -case, you may get some useful information on the screen that may -help solve the problem. - -The last option is to start @code{mysqld} with -@code{--standalone --debug}. -In this case @code{mysqld} will write a log file -@file{C:\mysqld.trace} that should contain the reason why -@code{mysqld} doesn't start. @xref{Making trace files}. - -Use @code{mysqld --help} to display all the options that -@code{mysqld} understands! - - -@node NT start, Windows running, Win95 start, Windows -@subsubsection Starting MySQL on Windows NT, 2000 or XP - -To get MySQL to work with TCP/IP on Windows NT 4, you must install -service pack 3 (or newer)! - -Normally you should install MySQL as a service on Windows NT/2000/XP. -In case the server was already running, first stop it using -the following command: - -@example -C:\mysql\bin> mysqladmin -u root shutdown -@end example - -This calls the MySQL administation utility as user `@code{root}', -which is the default @code{Administrator} in the MySQL grant system. -Please note that the MySQL grant system is wholly independent from -any login users under Windows. - -Now install the server service: - -@example -C:\mysql\bin> mysqld-max-nt --install -@end example - -If any options are required, they must be specified as -``@code{Start parameters}'' in the Windows @code{Services} -utility before you start the MySQL service. - -The @code{Services} utility -(@code{Windows Service Control Manager}) can be found in the -@code{Windows Control Panel} (under @code{Administrative Tools} -on Windows 2000). It is advisable to close the Services utility -while performing the @code{--install} or @code{--remove} -operations, this prevents some odd errors. - -For information about which server binary to run, see -@ref{Windows prepare environment}. - -Please note that from MySQL version 3.23.44, you have the choice -of set up the service as @code{Manual} instead (if you don't wish -the service to be started automatically during the boot process): - -@example -C:\mysql\bin> mysqld-max-nt --install-manual -@end example - -The service is installed with the name @code{MySQL}. Once -installed, it can be immediately started from the @code{Services} -utility, or by using the command @code{NET START MySQL}. - -Once running, @code{mysqld-max-nt} can be stopped using -@code{mysqladmin}, from the Services utility, or by using the -command @code{NET STOP MySQL}. - -When running as a service, the operating system will automatically stop -the MySQL service on computer shutdown. In MySQL versions < 3.23.47, -Windows only waited for a few seconds for the shutdown to complete, and -killed the database server process if the time limit was exceeded -(potentially causing problems). For instance, at the next startup the -@code{InnoDB} table handler had to do crash recovery. Starting from -MySQL version 3.23.48, the Windows will wait longer for the MySQL server -shutdown to complete. If you notice this is not enough for your -intallation, it is safest to run the MySQL server not as a service, but -from the Command prompt, and shut it down with @code{mysqladmin shutdown}. - -There is a problem that Windows NT (but not Windows 2000/XP) by default only -waits 20 seconds for a service to shut down, and after that kills the -service process. You can increase this default by opening the Registry -Editor @file{\winnt\system32\regedt32.exe} and editing the value of -@code{WaitToKillServiceTimeout} at -@file{HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control} -in the Registry tree. Specify the new larger value in milliseconds, -for example 120000 to have Windows NT wait upto 120 seconds. - -Please note that when run as a service, @code{mysqld-max-nt} -has no access to a console and so no messages can be seen. -Errors can be checked in @file{c:\mysql\data\mysql.err}. - -If you have problems installing @code{mysqld-max-nt} as a -service, try starting it with the full path: - -@example -C:\> C:\mysql\bin\mysqld-max-nt --install -@end example - -If this doesn't work, you can get @code{mysqld-max-nt} to -start properly by fixing the path in the registry! - -If you don't want to start @code{mysqld-max-nt} as a service, -you can start it as follows: - -@example -C:\> C:\mysql\bin\mysqld-max-nt --standalone -@end example - -or - -@example -C:\> C:\mysql\bin\mysqld --standalone --debug -@end example - -The last method gives you a debug trace in -@file{C:\mysqld.trace}. @xref{Making trace files}. - - -@node Windows running, Windows and SSH, NT start, Windows -@subsubsection Running MySQL on Windows - -@cindex TCP/IP -@cindex named pipes - -MySQL supports TCP/IP on all Windows platforms and named pipes on -NT/2000/XP. The default is to use named pipes for local connections -on NT/2000/XP and TCP/IP for all other cases if the client has TCP/IP -installed. The host name specifies which protocol is used: - -@multitable @columnfractions .15 .60 -@item @strong{Host name} @tab @strong{Protocol} -@item NULL (none) @tab -On NT/2000/XP, try named pipes first; if that doesn't work, use TCP/IP. -On 9x/Me, TCP/IP is used. -@item . @tab Named pipes -@item localhost @tab -TCP/IP to current host -@item hostname @tab -TCP/IP -@end multitable - -You can force a MySQL client to use named pipes by specifying the -@code{--pipe} option or by specifying @code{.} as the host name. Use the -@code{--socket} option to specify the name of the pipe. - -Note that starting from 3.23.50, named pipes are only enabled if mysqld is -started with @code{--enable-named-pipe}. This is because some users -have experienced problems shutting down the MySQL server when one uses -named pipes. - -You can test whether MySQL is working by executing the -following commands: - -@example -C:\> C:\mysql\bin\mysqlshow -C:\> C:\mysql\bin\mysqlshow -u root mysql -C:\> C:\mysql\bin\mysqladmin version status proc -C:\> C:\mysql\bin\mysql test -@end example - -If @code{mysqld} is slow to answer to connections on Windows 9x/Me, there is -probably a problem with your DNS. In this case, start @code{mysqld} with -@code{--skip-name-resolve} and use only @code{localhost} and IP numbers in -the MySQL grant tables. You can also avoid DNS when connecting to a -@code{mysqld-nt} MySQL server running on NT/2000/XP by using the -@code{--pipe} argument to specify use of named pipes. This works for most -MySQL clients. - -There are two versions of the MySQL command-line tool: -@multitable @columnfractions .10 .60 -@item @strong{Binary} @tab @strong{Description} -@item @code{mysql} @tab Compiled on native Windows, which offers very limited text editing capabilities. -@item @code{mysqlc} @tab Compiled with the Cygnus GNU compiler and libraries, which offers @code{readline} editing. -@end multitable - -If you want to use @code{mysqlc.exe}, you must copy -@file{C:\mysql\lib\cygwinb19.dll} to your Windows system directory -(@file{\windows\system} or similar place). - -The default privileges on Windows give all local users full privileges -to all databases without specifying a password. To make MySQL -more secure, you should set a password for all users and remove the row in -the @code{mysql.user} table that has @code{Host='localhost'} and -@code{User=''}. - -You should also add a password for the @code{root} user. The following -example starts by removing the anonymous user that has all privileges, -then sets a @code{root} user password: - -@example -C:\> C:\mysql\bin\mysql mysql -mysql> DELETE FROM user WHERE Host='localhost' AND User=''; -mysql> QUIT -C:\> C:\mysql\bin\mysqladmin reload -C:\> C:\mysql\bin\mysqladmin -u root password your_password -@end example - -After you've set the password, if you want to take down the @code{mysqld} -server, you can do so using this command: - -@example -C:\> mysqladmin --user=root --password=your_password shutdown -@end example - -If you are using the old shareware version of MySQL Version -3.21 under Windows, the above command will fail with an error: -@code{parse error near 'SET password'}. The solution for -this is to download and upgrade to the latest MySQL version, -which is now freely available. - -With the current MySQL versions you can easily add new users -and change privileges with @code{GRANT} and @code{REVOKE} commands. -@xref{GRANT}. - - -@node Windows and SSH, Windows symbolic links, Windows running, Windows -@subsubsection Connecting to a Remote MySQL from Windows with SSH - -@c FIX this is ugly, real ugly. - -@cindex SSH -@cindex connecting, remotely with SSH - -Here is a note about how to connect to get a secure connection to remote -MySQL server with SSH (by David Carlson @email{dcarlson@@mplcomm.com}): - -@itemize @bullet -@item -Install an SSH client on your Windows machine. As a user, the best non-free -one I've found is from @code{SecureCRT} from @uref{http://www.vandyke.com/}. -Another option is @code{f-secure} from @uref{http://www.f-secure.com/}. You -can also find some free ones on @code{Google} at -@uref{http://directory.google.com/Top/Computers/Security/Products_and_Tools/Cryptography/SSH/Clients/Windows/}. - -@item -Start your Windows SSH client. -Set @code{Host_Name = yourmysqlserver_URL_or_IP}. -Set @code{userid=your_userid} to log in to your server (probably not the same -as your MySQL login/password. - -@item -Set up port forwarding. Either do a remote forward (Set @code{local_port: 3306}, @code{remote_host: yourmysqlservername_or_ip}, @code{remote_port: 3306} ) -or a local forward (Set @code{port: 3306}, @code{host: localhost}, @code{remote port: 3306}). - -@item -Save everything, otherwise you'll have to redo it the next time. - -@item -Log in to your server with SSH session you just created. - -@item -On your Windows machine, start some ODBC application (such as Access). - -@item -Create a new file in Windows and link to MySQL using the ODBC -driver the same way you normally do, except type in @code{localhost} -for the MySQL host server@-not @code{yourmysqlservername}. -@end itemize - -You should now have an ODBC connection to MySQL, encrypted using SSH. - - -@node Windows symbolic links, Windows client compiling, Windows and SSH, Windows -@subsubsection Splitting Data Across Different Disks on Windows - -@cindex symbolic links -@cindex using multiple disks to start data -@cindex disks, splitting data across - -Beginning with MySQL Version 3.23.16, the @code{mysqld-max} -and @code{mysql-max-nt} servers in the MySQL distribution are -compiled with the @code{-DUSE_SYMDIR} option. This allows you to put a -database on different disk by adding a symbolic link to it -(in a manner similar to the way that symbolic links work on Unix). - -On Windows, you make a symbolic link to a database by creating a file -that contains the path to the destination directory and saving this in -the @file{mysql_data} directory under the filename @file{database.sym}. -Note that the symbolic link will be used only if the directory -@file{mysql_data_dir\database} doesn't exist. - -For example, if the MySQL data directory is @file{C:\mysql\data} -and you want to have database @code{foo} located at @file{D:\data\foo}, you -should create the file @file{C:\mysql\data\foo.sym} that contains the -text @code{D:\data\foo\}. After that, all tables created in the database -@code{foo} will be created in @file{D:\data\foo}. - -Note that because of the speed penalty you get when opening every table, -we have not enabled this by default even if you have compiled -MySQL with support for this. To enable symlinks you should put -in your @file{my.cnf} or @file{my.ini} file the following entry: - -@example -[mysqld] -use-symbolic-links -@end example - -In MySQL 4.0 we will enable symlinks by default. Then you -should instead use the @code{skip-symlink} option if you want to -disable this. - - -@node Windows client compiling, Windows vs Unix, Windows symbolic links, Windows -@subsubsection Compiling MySQL Clients on Windows - -@cindex compiling, on Windows -@cindex Windows, compiling on - -In your source files, you should include @file{windows.h} before you include -@file{mysql.h}: - -@example -#if defined(_WIN32) || defined(_WIN64) -#include <windows.h> -#endif -#include <mysql.h> -@end example - -You can either link your code with the dynamic @file{libmysql.lib} library, -which is just a wrapper to load in @file{libmysql.dll} on demand, or link -with the static @file{mysqlclient.lib} library. - -Note that as the mysqlclient libraries are compiled as threaded libraries, -you should also compile your code to be multi-threaded! - - -@node Windows vs Unix, , Windows client compiling, Windows -@subsubsection MySQL-Windows Compared to Unix MySQL - -@cindex Windows, versus Unix -@cindex operating systems, Windows versus Unix - -MySQL-Windows has by now proven itself to be very stable. This version -of MySQL has the same features as the corresponding Unix version -with the following exceptions: - -@table @strong -@item Windows 95 and threads -Windows 95 leaks about 200 bytes of main memory for each thread creation. -Each connection in MySQL creates a new thread, so you shouldn't -run @code{mysqld} for an extended time on Windows 95 if your server handles -many connections! Other versions of Windows don't suffer from this bug. - -@item Concurrent reads -MySQL depends on the @code{pread()} and @code{pwrite()} calls to be -able to mix @code{INSERT} and @code{SELECT}. Currently we use mutexes -to emulate @code{pread()}/@code{pwrite()}. We will, in the long run, -replace the file level interface with a virtual interface so that we can -use the @code{readfile()}/@code{writefile()} interface on NT/2000/XP to -get more speed. -The current implementation limits the number of open files MySQL -can use to 1024, which means that you will not be able to run as many -concurrent threads on NT/2000/XP as on Unix. - -@item Blocking read -MySQL uses a blocking read for each connection. -This means that: - -@itemize @bullet -@item -A connection will not be disconnected automatically after 8 hours, as happens -with the Unix version of MySQL. - -@item -If a connection hangs, it's impossible to break it without killing -MySQL. - -@item -@code{mysqladmin kill} will not work on a sleeping connection. - -@item -@code{mysqladmin shutdown} can't abort as long as there are sleeping -connections. -@end itemize - -We plan to fix this problem when our Windows developers have figured out a -nice workaround. - -@item @code{DROP DATABASE} -You can't drop a database that is in use by some thread. - -@item Killing MySQL from the task manager -You can't kill MySQL from the task manager or with the shutdown -utility in Windows 95. You must take it down with @code{mysqladmin shutdown}. - -@item Case-insensitive names -Filenames are case-insensitive on Windows, so database and table names -are also case-insensitive in MySQL for Windows. The only -restriction is that database and table names must be specified using the same -case throughout a given statement. @xref{Name case sensitivity}. - -@item The @samp{\} directory character -Pathname components in Windows 95 are separated by the @samp{\} character, -which is also the escape character in MySQL. If you are using @code{LOAD -DATA INFILE} or @code{SELECT ... INTO OUTFILE}, you must double the @samp{\} -character: - -@example -mysql> LOAD DATA INFILE "C:\\tmp\\skr.txt" INTO TABLE skr; -mysql> SELECT * INTO OUTFILE 'C:\\tmp\\skr.txt' FROM skr; -@end example - -Alternatively, use Unix style filenames with @samp{/} characters: - -@example -mysql> LOAD DATA INFILE "C:/tmp/skr.txt" INTO TABLE skr; -mysql> SELECT * INTO OUTFILE 'C:/tmp/skr.txt' FROM skr; -@end example - -@item @code{Can't open named pipe} error -If you use a MySQL 3.22 version on NT with the newest mysql-clients -you will get the following error: - -@example -error 2017: can't open named pipe to host: . pipe... -@end example - -@tindex .my.cnf file -This is because the release version of MySQL uses named pipes on NT -by default. You can avoid this error by using the @code{--host=localhost} -option to the new MySQL clients or create an option file -@file{C:\my.cnf} that contains the following information: - -@example -[client] -host = localhost -@end example - -Starting from 3.23.50, named pipes are only enabled if @code{mysqld} is started -with @code{--enable-named-pipe}. - -@item @code{Access denied for user} error -If you get the error @code{Access denied for user: 'some-user@@unknown' -to database 'mysql'} when accessing a MySQL server on the same -machine, this means that MySQL can't resolve your host name -properly. - -To fix this, you should create a file @file{\windows\hosts} with the -following information: - -@example -127.0.0.1 localhost -@end example - -@item @code{ALTER TABLE} -While you are executing an @code{ALTER TABLE} statement, the table is locked -from usage by other threads. This has to do with the fact that on Windows, -you can't delete a file that is in use by another threads. (In the future, -we may find some way to work around this problem.) - -@item -@code{DROP TABLE} on a table that is in use by a @code{MERGE} table will -not work on Windows because @code{MERGE} handler does the table mapping -hidden from the upper layer of MySQL. Because Windows doesn't allow you -to drop files that are open, you first must flush all @code{MERGE} -tables (with @code{FLUSH TABLES}) or drop the @code{MERGE} table before -dropping the table. We will fix this at the same time we introduce -@code{VIEW}s. -@item -@code{DATA DIRECTORY} and @code{INDEX DIRECTORY} directives in -@code{CREATE TABLE} is ignored on Windows, because Windows doesn't support -symbolic links. -@end table - -Here are some open issues for anyone who might want to help us with the Windows -release: - -@cindex Windows, open issues - -@itemize @bullet -@item -Make a single-user @code{MYSQL.DLL} server. This should include everything in -a standard MySQL server, except thread creation. This will make -MySQL much easier to use in applications that don't need a true -client/server and don't need to access the server from other hosts. - -@item -Add some nice start and shutdown icons to the MySQL installation. - -@item -When registering @code{mysqld} as a service with @code{--install} (on NT) -it would be nice if you could also add default options on the command-line. -For the moment, the workaround is to list the parameters in the -@file{C:\my.cnf} file instead. - -@item -It would be really nice to be able to kill @code{mysqld} from the task manager. -For the moment, you must use @code{mysqladmin shutdown}. - -@item -Port @code{readline} to Windows for use in the @code{mysql} command-line tool. - -@item -GUI versions of the standard MySQL clients (@code{mysql}, -@code{mysqlshow}, @code{mysqladmin}, and @code{mysqldump}) would be nice. - -@item -It would be nice if the socket read and write functions in @file{net.c} were -interruptible. This would make it possible to kill open threads with -@code{mysqladmin kill} on Windows. - -@item -@code{mysqld} always starts in the "C" locale and not in the default locale. -We would like to have @code{mysqld} use the current locale for the sort order. - -@item -Add macros to use the faster thread-safe increment/decrement methods -provided by Windows. -@end itemize - -Other Windows-specific issues are described in the @file{README} file that -comes with the MySQL-Windows distribution. - - -@node Solaris, BSD Notes, Windows, Operating System Specific Notes -@subsection Solaris Notes - -@cindex Solaris installation problems -@cindex problems, installing on Solaris -@cindex tar, problems on Solaris -@cindex errors, directory checksum -@cindex checksum errors - -On Solaris, you may run into trouble even before you get the MySQL -distribution unpacked! Solaris @code{tar} can't handle long file names, so -you may see an error like this when you unpack MySQL: - -@example -x mysql-3.22.12-beta/bench/Results/ATIS-mysql_odbc-NT_4.0-cmp-db2,\ -informix,ms-sql,mysql,oracle,solid,sybase, 0 bytes, 0 tape blocks -tar: directory checksum error -@end example - -In this case, you must use GNU @code{tar} (@code{gtar}) to unpack the -distribution. You can find a precompiled copy for Solaris at -@uref{http://www.mysql.com/Downloads/}. - -Sun native threads work only on Solaris 2.5 and higher. For Version 2.4 and -earlier, MySQL will automatically use MIT-pthreads. -@xref{MIT-pthreads}. - -If you get the following error from configure: - -@example -checking for restartable system calls... configure: error can not run test -programs while cross compiling -@end example - -This means that you have something wrong with your compiler installation! -In this case you should upgrade your compiler to a newer version. You may -also be able to solve this problem by inserting the following row into the -@file{config.cache} file: - -@example -ac_cv_sys_restartable_syscalls=$@{ac_cv_sys_restartable_syscalls='no'@} -@end example - -If you are using Solaris on a SPARC, the recommended compiler is -@code{gcc} 2.95.2. You can find this at @uref{http://gcc.gnu.org/}. -Note that @code{egcs} 1.1.1 and @code{gcc} 2.8.1 don't work reliably on -SPARC! - -The recommended @code{configure} line when using @code{gcc} 2.95.2 is: - -@example -CC=gcc CFLAGS="-O3" \ -CXX=gcc CXXFLAGS="-O3 -felide-constructors -fno-exceptions -fno-rtti" \ -./configure --prefix=/usr/local/mysql --with-low-memory --enable-assembler -@end example - -If you have an UltraSPARC, you can get 4% more performance by adding -"-mcpu=v8 -Wa,-xarch=v8plusa" to CFLAGS and CXXFLAGS. - -If you have Sun Workshop (Fortre) 5.3 (or newer) compiler, you can -run @code{configure} like this: - -@example -CC=cc CFLAGS="-Xa -fast -xO4 -native -xstrconst -mt" \ -CXX=CC CXXFLAGS="-noex -xO4 -mt" \ -./configure --prefix=/usr/local/mysql --enable-assembler -@end example - -In the MySQL benchmarks, we got a 6% speedup on an UltraSPARC when -using Sun Workshop 5.3 compared to using gcc with -mcpu flags. - -If you get a problem with @code{fdatasync} or @code{sched_yield}, -you can fix this by adding @code{LIBS=-lrt} to the configure line - -The following paragraph is only relevant for older compilers than -WorkShop 5.3: - -You may also have to edit the @code{configure} script to change this line: - -@example -#if !defined(__STDC__) || __STDC__ != 1 -@end example - -to this: - -@example -#if !defined(__STDC__) -@end example - -If you turn on @code{__STDC__} with the @code{-Xc} option, the Sun compiler -can't compile with the Solaris @file{pthread.h} header file. This is a Sun -bug (broken compiler or broken include file). - -If @code{mysqld} issues the error message shown here when you run it, you have -tried to compile MySQL with the Sun compiler without enabling the -multi-thread option (@code{-mt}): - -@example -libc internal error: _rmutex_unlock: rmutex not held -@end example - -Add @code{-mt} to @code{CFLAGS} and @code{CXXFLAGS} and try again. - -If you are using the SFW version of gcc (which comes with Solaris 8), -you must add @file{/opt/sfw/lib} to the environment variable -@code{LD_LIBRARY_PATH} before running configure. - -If you are using the gcc available from @code{sunfreeware.com}, you may -have many problems. You should recompile gcc and GNU binutils on the -machine you will be running them from to avoid any problems. - -If you get the following error when compiling MySQL with @code{gcc}, -it means that your @code{gcc} is not configured for your version of Solaris: - -@example -shell> gcc -O3 -g -O2 -DDBUG_OFF -o thr_alarm ... -./thr_alarm.c: In function `signal_hand': -./thr_alarm.c:556: too many arguments to function `sigwait' -@end example - -The proper thing to do in this case is to get the newest version of -@code{gcc} and compile it with your current @code{gcc} compiler! At -least for Solaris 2.5, almost all binary versions of @code{gcc} have -old, unusable include files that will break all programs that use -threads (and possibly other programs)! - -Solaris doesn't provide static versions of all system libraries -(@code{libpthreads} and @code{libdl}), so you can't compile MySQL -with @code{--static}. If you try to do so, you will get the error: - -@example -ld: fatal: library -ldl: not found - -or - -undefined reference to `dlopen' - -or - -cannot find -lrt -@end example - -If too many processes try to connect very rapidly to @code{mysqld}, you will -see this error in the MySQL log: - -@example -Error in accept: Protocol error -@end example - -You might try starting the server with the @code{--set-variable back_log=50} -option as a workaround for this. Please note that @code{--set-variable} is -deprecated since @strong{MySQL 4.0}, just use @code{--back_log=50} instead. -@xref{Command-line options}. - -If you are linking your own MySQL client, you might get the -following error when you try to execute it: - -@example -ld.so.1: ./my: fatal: libmysqlclient.so.#: -open failed: No such file or directory -@end example - -The problem can be avoided by one of the following methods: - -@itemize @bullet -@item -Link the client with the following flag (instead of @code{-Lpath}): -@code{-Wl,r/full-path-to-libmysqlclient.so}. - -@item -Copy @file{libmysqclient.so} to @file{/usr/lib}. - -@tindex LD_RUN_PATH environment variable -@tindex Environment variable, LD_RUN_PATH -@item -Add the pathname of the directory where @file{libmysqlclient.so} is located -to the @code{LD_RUN_PATH} environment variable before running your client. -@end itemize - -If you have problems with configure trying to link with @code{-lz} and -you don't have @code{zlib} installed, you have two options: - -@itemize @bullet -@item -If you want to be able to use the compressed communication protocol, -you need to get and install zlib from ftp.gnu.org. - -@item -Configure with @code{--with-named-z-libs=no}. -@end itemize - -If you are using gcc and have problems with loading @code{UDF} functions -into MySQL, try adding @code{-lgcc} to the link line for the -@code{UDF} function. - -If you would like MySQL to start automatically, you can copy -@file{support-files/mysql.server} to @file{/etc/init.d} and create a -symbolic link to it named @file{/etc/rc3.d/S99mysql.server}. - -As Solaris doesn't support core files for @code{setuid()} applications, -you can't get a core file from @code{mysqld} if you are using the -@code{--user} option. - -@menu -* Solaris 2.7:: Solaris 2.7/2.8 Notes -* Solaris x86:: Solaris x86 Notes -@end menu - - -@node Solaris 2.7, Solaris x86, Solaris, Solaris -@subsubsection Solaris 2.7/2.8 Notes - -You can normally use a Solaris 2.6 binary on Solaris 2.7 and 2.8. Most -of the Solaris 2.6 issues also apply for Solaris 2.7 and 2.8. - -Note that MySQL Version 3.23.4 and above should be able to autodetect -new versions of Solaris and enable workarounds for the following problems! - -Solaris 2.7 / 2.8 has some bugs in the include files. You may see the -following error when you use @code{gcc}: - -@example -/usr/include/widec.h:42: warning: `getwc' redefined -/usr/include/wchar.h:326: warning: this is the location of the previous -definition -@end example - -If this occurs, you can do the following to fix the problem: - -Copy @code{/usr/include/widec.h} to -@code{.../lib/gcc-lib/os/gcc-version/include} and change line 41 from: - -@example -#if !defined(lint) && !defined(__lint) - -to - -#if !defined(lint) && !defined(__lint) && !defined(getwc) -@end example - -Alternatively, you can edit @file{/usr/include/widec.h} directly. Either -way, after you make the fix, you should remove @file{config.cache} and run -@code{configure} again! - -If you get errors like this when you run @code{make}, it's because -@code{configure} didn't detect the @file{curses.h} file (probably -because of the error in @file{/usr/include/widec.h}): - -@example -In file included from mysql.cc:50: -/usr/include/term.h:1060: syntax error before `,' -/usr/include/term.h:1081: syntax error before `;' -@end example - -The solution to this is to do one of the following: - -@itemize @bullet -@item -Configure with @code{CFLAGS=-DHAVE_CURSES_H CXXFLAGS=-DHAVE_CURSES_H ./configure}. - -@item -Edit @file{/usr/include/widec.h} as indicted above and rerun configure. - -@item -Remove the @code{#define HAVE_TERM} line from @file{config.h} file and -run @code{make} again. -@end itemize - -If you get a problem that your linker can't find @code{-lz} when linking -your client program, the problem is probably that your @file{libz.so} file is -installed in @file{/usr/local/lib}. You can fix this by one of the -following methods: - -@itemize @bullet -@item -Add @file{/usr/local/lib} to @code{LD_LIBRARY_PATH}. - -@item -Add a link to @file{libz.so} from @file{/lib}. - -@item -If you are using Solaris 8, you can install the optional zlib from your -Solaris 8 CD distribution. - -@item -Configure MySQL with the @code{--with-named-z-libs=no} option. -@end itemize - - -@node Solaris x86, , Solaris 2.7, Solaris -@subsubsection Solaris x86 Notes - -On Solaris 2.8 on x86, @code{mysqld} will core dump if you run -'strip' in. - -If you are using @code{gcc} or @code{egcs} on Solaris x86 and you -experience problems with core dumps under load, you should use the -following @code{configure} command: - -@example -CC=gcc CFLAGS="-O3 -fomit-frame-pointer -DHAVE_CURSES_H" \ -CXX=gcc \ -CXXFLAGS="-O3 -fomit-frame-pointer -felide-constructors -fno-exceptions \ --fno-rtti -DHAVE_CURSES_H" \ -./configure --prefix=/usr/local/mysql -@end example - -This will avoid problems with the @code{libstdc++} library and with C++ -exceptions. - -If this doesn't help, you should compile a debug version and run -it with a trace file or under @code{gdb}. @xref{Using gdb on mysqld}. - - -@node BSD Notes, Mac OS X, Solaris, Operating System Specific Notes -@subsection BSD Notes - -This section provides information for the various BSD flavours, -as well as specific versions within those. - -@menu -* FreeBSD:: FreeBSD Notes -* NetBSD:: NetBSD notes -* OpenBSD:: OpenBSD 2.5 Notes -* OpenBSD 2.8:: OpenBSD 2.8 Notes -* BSDI:: BSD/OS Version 2.x Notes -* BSDI3:: BSD/OS Version 3.x Notes -* BSDI4:: BSD/OS Version 4.x Notes -@end menu - - -@node FreeBSD, NetBSD, BSD Notes, BSD Notes -@subsubsection FreeBSD Notes - -FreeBSD 3.x is recommended for running MySQL since the thread package -is much more integrated. - -The easiest and therefore the preferred way to install is to use the -mysql-server and mysql-client ports available on -@uref{http://www.freebsd.org/}. - -Using these gives you: -@itemize @bullet -@item -A working MySQL with all optimisations known to work on your version -of FreeBSD enabled. - -@item -Automatic configuration and build. - -@item -Startup scripts installed in /usr/local/etc/rc.d. - -@item -Ability to see which files that are installed with pkg_info -L. And to -remove them all with pkg_delete if you no longer want MySQL on that -machine. -@end itemize - -It is recommended you use MIT-pthreads on FreeBSD 2.x and native threads on -Versions 3 and up. It is possible to run with native threads on some late -2.2.x versions but you may encounter problems shutting down @code{mysqld}. - -The MySQL @file{Makefile}s require GNU make (@code{gmake}) to work. If -you want to compile MySQL you need to install GNU @code{make} first. - -Be sure to have your name resolver setup correct. Otherwise, you may -experience resolver delays or failures when connecting to @code{mysqld}. - -Make sure that the @code{localhost} entry in the @file{/etc/hosts} file is -correct (otherwise, you will have problems connecting to the database). The -@file{/etc/hosts} file should start with a line: - -@example -127.0.0.1 localhost localhost.your.domain -@end example - -The recommended way to compile and install MySQL on FreeBSD with -gcc (2.95.2 and up) is: - -@example -CC=gcc CFLAGS="-O2 -fno-strength-reduce" \ -CXX=gcc CXXFLAGS="-O2 -fno-rtti -fno-exceptions -felide-constructors \ --fno-strength-reduce" \ -./configure --prefix=/usr/local/mysql --enable-assembler -gmake -gmake install -./scripts/mysql_install_db -cd /usr/local/mysql -./bin/mysqld_safe & -@end example - -If you notice that @code{configure} will use MIT-pthreads, you should read -the MIT-pthreads notes. @xref{MIT-pthreads}. - -If you get an error from @code{make install} that it can't find -@file{/usr/include/pthreads}, @code{configure} didn't detect that you need -MIT-pthreads. This is fixed by executing these commands: - -@example -shell> rm config.cache -shell> ./configure --with-mit-threads -@end example - -FreeBSD is also known to have a very low default file handle limit. -@xref{Not enough file handles}. Uncomment the ulimit -n section in -safe_mysqld or raise the limits for the @code{mysqld} user in /etc/login.conf -(and rebuild it with cap_mkdb /etc/login.conf). Also be sure you set the -appropriate class for this user in the password file if you are not -using the default (use: chpass mysqld-user-name). @xref{safe_mysqld, , -@code{safe_mysqld}}. - -If you have a lot of memory you should consider rebuilding -the kernel to allow MySQL to take more than 512M of RAM. -Take a look at @code{option MAXDSIZ} in the LINT config -file for more info. - -If you get problems with the current date in MySQL, setting the -@code{TZ} variable will probably help. @xref{Environment variables}. - -To get a secure and stable system you should only use FreeBSD kernels -that are marked @code{-RELEASE}. - - -@node NetBSD, OpenBSD, FreeBSD, BSD Notes -@subsubsection NetBSD notes - -To compile on NetBSD you need GNU @code{make}. Otherwise, the compile will -crash when @code{make} tries to run @code{lint} on C++ files. - - -@node OpenBSD, OpenBSD 2.8, NetBSD, BSD Notes -@subsubsection OpenBSD 2.5 Notes - -On OpenBSD Version 2.5, you can compile MySQL with native threads -with the following options: - -@example -CFLAGS=-pthread CXXFLAGS=-pthread ./configure --with-mit-threads=no -@end example - - -@node OpenBSD 2.8, BSDI, OpenBSD, BSD Notes -@subsubsection OpenBSD 2.8 Notes - -Our users have reported that OpenBSD 2.8 has a threading bug which causes -problems with MySQL. The OpenBSD Developers have fixed the problem, -but as of January 25th, 2001, it's only available in the ``-current'' branch. -The symptoms of this threading bug are: slow response, high load, high CPU -usage, and crashes. - -If you get an error like @code{Error in accept:: Bad file descriptor} or -error 9 when trying to open tables or directories, the problem is probably -that you haven't allocated enough file descriptors for MySQL. - -In this case try starting @code{safe_mysqld} as root with the following -options: - -@code{--user=mysql --open-files-limit=2048} - -@node BSDI, BSDI3, OpenBSD 2.8, BSD Notes -@subsubsection BSD/OS Version 2.x Notes - -If you get the following error when compiling MySQL, your -@code{ulimit} value for virtual memory is too low: - -@example -item_func.h: In method `Item_func_ge::Item_func_ge(const Item_func_ge &)': -item_func.h:28: virtual memory exhausted -make[2]: *** [item_func.o] Error 1 -@end example - -Try using @code{ulimit -v 80000} and run @code{make} again. If this -doesn't work and you are using @code{bash}, try switching to @code{csh} -or @code{sh}; some BSDI users have reported problems with @code{bash} -and @code{ulimit}. - -If you are using @code{gcc}, you may also use have to use the -@code{--with-low-memory} flag for @code{configure} to be able to compile -@file{sql_yacc.cc}. - -If you get problems with the current date in MySQL, setting the -@code{TZ} variable will probably help. @xref{Environment variables}. - - -@node BSDI3, BSDI4, BSDI, BSD Notes -@subsubsection BSD/OS Version 3.x Notes - -Upgrade to BSD/OS Version 3.1. If that is not possible, install -BSDIpatch M300-038. - -Use the following command when configuring MySQL: - -@example -shell> env CXX=shlicc++ CC=shlicc2 \ - ./configure \ - --prefix=/usr/local/mysql \ - --localstatedir=/var/mysql \ - --without-perl \ - --with-unix-socket-path=/var/mysql/mysql.sock -@end example - -The following is also known to work: - -@example -shell> env CC=gcc CXX=gcc CXXFLAGS=-O3 \ - ./configure \ - --prefix=/usr/local/mysql \ - --with-unix-socket-path=/var/mysql/mysql.sock -@end example - -You can change the directory locations if you wish, or just use the -defaults by not specifying any locations. - -If you have problems with performance under heavy load, try using the -@code{--skip-thread-priority} option to @code{mysqld}! This will run -all threads with the same priority; on BSDI Version 3.1, this gives better -performance (at least until BSDI fixes their thread scheduler). - -If you get the error @code{virtual memory exhausted} while compiling, -you should try using @code{ulimit -v 80000} and run @code{make} again. -If this doesn't work and you are using @code{bash}, try switching to -@code{csh} or @code{sh}; some BSDI users have reported problems with -@code{bash} and @code{ulimit}. - - -@node BSDI4, , BSDI3, BSD Notes -@subsubsection BSD/OS Version 4.x Notes - -BSDI Version 4.x has some thread-related bugs. If you want to use -MySQL on this, you should install all thread-related patches. At -least M400-023 should be installed. - -On some BSDI Version 4.x systems, you may get problems with shared libraries. -The symptom is that you can't execute any client programs, for example, -@code{mysqladmin}. In this case you need to reconfigure not to use -shared libraries with the @code{--disable-shared} option to configure. - -Some customers have had problems on BSDI 4.0.1 that the @code{mysqld} -binary after a while can't open tables. This is because some -library/system related bug causes @code{mysqld} to change current -directory without asking for this! - -The fix is to either upgrade to 3.23.34 or after running @code{configure} -remove the line @code{#define HAVE_REALPATH} from @code{config.h} -before running make. - -Note that the above means that you can't symbolic link a database directories -to another database directory or symbolic link a table to another database -on BSDI! (Making a symbolic link to another disk is okay). - - -@node Mac OS X, Other Unix Notes, BSD Notes, Operating System Specific Notes -@subsection Mac OS X Notes - -@menu -* Mac OS X Public Beta:: Mac OS X Public Beta -* Mac OS X Server:: Mac OS X Server -@end menu - - -@node Mac OS X Public Beta, Mac OS X Server, Mac OS X, Mac OS X -@subsubsection Mac OS X Public Beta - -MySQL should work without any problems on Mac OS X Public Beta -(Darwin). You don't need the pthread patches for this OS! - - -@node Mac OS X Server, , Mac OS X Public Beta, Mac OS X -@subsubsection Mac OS X Server - -Before trying to configure MySQL on Mac OS X server you must -first install the pthread package from -@uref{http://www.prnet.de/RegEx/mysql.html}. - -Our binary for Mac OS X is compiled on Rhapsody 5.5 with the following -configure line: - -@example -CC=gcc CFLAGS="-O2 -fomit-frame-pointer" CXX=gcc CXXFLAGS="-O2 \ --fomit-frame-pointer" ./configure --prefix=/usr/local/mysql \ -"--with-comment=Official MySQL binary" --with-extra-charsets=complex \ ---disable-shared -@end example - -You might want to also add aliases to your shell's resource file to -access @code{mysql} and @code{mysqladmin} from the command-line: - -@example -alias mysql '/usr/local/mysql/bin/mysql' -alias mysqladmin '/usr/local/mysql/bin/mysqladmin' -@end example - - -@node Other Unix Notes, OS/2, Mac OS X, Operating System Specific Notes -@subsection Other Unix Notes - -@menu -* Binary notes-HP-UX:: HP-UX Notes for Binary Distributions -* HP-UX 10.20:: HP-UX Version 10.20 Notes -* HP-UX 11.x:: HP-UX Version 11.x Notes -* IBM-AIX:: IBM-AIX notes -* SunOS:: SunOS 4 Notes -* Alpha-DEC-UNIX:: Alpha-DEC-UNIX Notes (Tru64) -* Alpha-DEC-OSF1:: Alpha-DEC-OSF/1 Notes -* SGI-Irix:: SGI Irix Notes -* Caldera:: Caldera Notes -* Caldera Unixware:: Caldera Unixware Version 7.0 Notes -@end menu - - -@node Binary notes-HP-UX, HP-UX 10.20, Other Unix Notes, Other Unix Notes -@subsubsection HP-UX Notes for Binary Distributions - -@cindex HP-UX, binary distribution -@cindex binary distributions, on HP-UX - -Some of the binary distributions of MySQL for HP-UX is -distributed as an HP depot file and as a tar file. To use the depot -file you must be running at least HP-UX 10.x to have access to HP's -software depot tools. - -The HP version of MySQL was compiled on an HP 9000/8xx server -under HP-UX 10.20, and uses MIT-pthreads. It is known to work well under -this configuration. MySQL Version 3.22.26 and newer can also be -built with HP's native thread package. - -Other configurations that may work: - -@itemize @bullet -@item -HP 9000/7xx running HP-UX 10.20+ -@item -HP 9000/8xx running HP-UX 10.30 -@end itemize - -The following configurations almost definitely won't work: - -@itemize @bullet -@item -HP 9000/7xx or 8xx running HP-UX 10.x where x < 2 -@item -HP 9000/7xx or 8xx running HP-UX 9.x -@end itemize - -To install the distribution, use one of the commands here, where -@code{/path/to/depot} is the full pathname of the depot file: - -@itemize @bullet -@item -To install everything, including the server, client and development tools: - -@example -shell> /usr/sbin/swinstall -s /path/to/depot mysql.full -@end example - -@item -To install only the server: - -@example -shell> /usr/sbin/swinstall -s /path/to/depot mysql.server -@end example - -@item -To install only the client package: - -@example -shell> /usr/sbin/swinstall -s /path/to/depot mysql.client -@end example - -@item -To install only the development tools: - -@example -shell> /usr/sbin/swinstall -s /path/to/depot mysql.developer -@end example -@end itemize - -The depot places binaries and libraries in @file{/opt/mysql} and data in -@file{/var/opt/mysql}. The depot also creates the appropriate entries in -@file{/etc/init.d} and @file{/etc/rc2.d} to start the server automatically -at boot time. Obviously, this entails being @code{root} to install. - -To install the HP-UX tar.gz distribution, you must have a copy of GNU -@code{tar}. - - -@node HP-UX 10.20, HP-UX 11.x, Binary notes-HP-UX, Other Unix Notes -@subsubsection HP-UX Version 10.20 Notes - -There are a couple of small problems when compiling MySQL on -HP-UX. We recommend that you use @code{gcc} instead of the HP-UX native -compiler, because @code{gcc} produces better code! - -We recommend using gcc 2.95 on HP-UX. Don't use high optimisation -flags (like -O6) as this may not be safe on HP-UX. - -The following configure line should work with gcc 2.95: - -@example -CFLAGS="-I/opt/dce/include -fpic" \ -CXXFLAGS="-I/opt/dce/include -felide-constructors -fno-exceptions \ --fno-rtti" CXX=gcc ./configure --with-pthread \ ---with-named-thread-libs='-ldce' --prefix=/usr/local/mysql --disable-shared -@end example - -The following configure line should work with gcc 3.1: - -@example -CFLAGS="-DHPUX -I/opt/dce/include -O3 -fPIC" CXX=gcc \ -CXXFLAGS="-DHPUX -I/opt/dce/include -felide-constructors -fno-exceptions \ --fno-rtti -O3 -fPIC" ./configure --prefix=/usr/local/mysql \ ---with-extra-charsets=complex --enable-thread-safe-client \ ---enable-local-infile --with-pthread \ ---with-named-thread-libs=-ldce --with-lib-ccflags=-fPIC ---disable-shared -@end example - -@node HP-UX 11.x, IBM-AIX, HP-UX 10.20, Other Unix Notes -@subsubsection HP-UX Version 11.x Notes - -For HP-UX Version 11.x we recommend MySQL Version 3.23.15 or later. - -Because of some critical bugs in the standard HP-UX libraries, you should -install the following patches before trying to run MySQL on HP-UX 11.0: - -@example -PHKL_22840 Streams cumulative -PHNE_22397 ARPA cumulative -@end example - -This will solve the problem of getting @code{EWOULDBLOCK} from @code{recv()} -and @code{EBADF} from @code{accept()} in threaded applications. - -If you are using @code{gcc} 2.95.1 on an unpatched HP-UX 11.x system, -you will get the error: - -@example -In file included from /usr/include/unistd.h:11, - from ../include/global.h:125, - from mysql_priv.h:15, - from item.cc:19: -/usr/include/sys/unistd.h:184: declaration of C function ... -/usr/include/sys/pthread.h:440: previous declaration ... -In file included from item.h:306, - from mysql_priv.h:158, - from item.cc:19: -@end example - -The problem is that HP-UX doesn't define @code{pthreads_atfork()} consistently. -It has conflicting prototypes in -@file{/usr/include/sys/unistd.h}:184 and -@file{/usr/include/sys/pthread.h}:440 (details below). - -One solution is to copy @file{/usr/include/sys/unistd.h} into -@file{mysql/include} and edit @file{unistd.h} and change it to match -the definition in @file{pthread.h}. Here's the diff: - -@example -183,184c183,184 -< extern int pthread_atfork(void (*prepare)(), void (*parent)(), -< void (*child)()); ---- -> extern int pthread_atfork(void (*prepare)(void), void (*parent)(void), -> void (*child)(void)); -@end example - -After this, the following configure line should work: - -@example -CFLAGS="-fomit-frame-pointer -O3 -fpic" CXX=gcc \ -CXXFLAGS="-felide-constructors -fno-exceptions -fno-rtti -O3" \ -./configure --prefix=/usr/local/mysql --disable-shared -@end example - -Here is some information that a HP-UX Version 11.x user sent us about compiling -MySQL with HP-UX:x compiler: - -@example - Environment: - proper compilers. - setenv CC cc - setenv CXX aCC - flags - setenv CFLAGS -D_REENTRANT - setenv CXXFLAGS -D_REENTRANT - setenv CPPFLAGS -D_REENTRANT - % aCC -V - aCC: HP ANSI C++ B3910B X.03.14.06 - % cc -V /tmp/empty.c - cpp.ansi: HP92453-01 A.11.02.00 HP C Preprocessor (ANSI) - ccom: HP92453-01 A.11.01.00 HP C Compiler - cc: "/tmp/empty.c", line 1: warning 501: Empty source file. - - configuration: - ./configure --with-pthread \ - --prefix=/source-control/mysql \ - --with-named-thread-libs=-lpthread \ - --with-low-memory - - added '#define _CTYPE_INCLUDED' to include/m_ctype.h. This - symbol is the one defined in HP's /usr/include/ctype.h: - - /* Don't include std ctype.h when this is included */ - #define _CTYPE_H - #define __CTYPE_INCLUDED - #define _CTYPE_INCLUDED - #define _CTYPE_USING /* Don't put names in global namespace. */ -@end example - -@itemize @bullet -@item -I had to use the compile-time flag @code{-D_REENTRANT} to get the compiler -to recognise the prototype for @code{localtime_r}. Alternatively I could have -supplied the prototype for @code{localtime_r}. But I wanted to catch other -bugs without needing to run into them. I wasn't sure where I needed it, so I -added it to all flags. -@item -The optimisation flags used by MySQL (-O3) are not recognised by HP's -compilers. I did not change the flags. -@end itemize - -If you get the following error from @code{configure} - -@example -checking for cc option to accept ANSI C... no -configure: error: MySQL requires a ANSI C compiler (and a C++ compiler). -Try gcc. See the Installation chapter in the Reference Manual. -@end example - -Check that you don't have the path to the K&R compiler before the path -to the HP-UX C and C++ compiler. - - -@node IBM-AIX, SunOS, HP-UX 11.x, Other Unix Notes -@subsubsection IBM-AIX notes - -@cindex problems, installing on IBM-AIX - -Automatic detection of @code{xlC} is missing from Autoconf, so a -@code{configure} command something like this is needed when compiling -MySQL (This example uses the IBM compiler): - -@example -export CC="xlc_r -ma -O3 -qstrict -qoptimize=3 -qmaxmem=8192 " -export CXX="xlC_r -ma -O3 -qstrict -qoptimize=3 -qmaxmem=8192" -export CFLAGS="-I /usr/local/include" -export LDFLAGS="-L /usr/local/lib" -export CPPFLAGS=$CFLAGS -export CXXFLAGS=$CFLAGS - -./configure --prefix=/usr/local \ - --localstatedir=/var/mysql \ - --sysconfdir=/etc/mysql \ - --sbindir='/usr/local/bin' \ - --libexecdir='/usr/local/bin' \ - --enable-thread-safe-client \ - --enable-large-files -@end example - -Above are the options used to compile the MySQL distribution that -can be found at @uref{http://www-frec.bull.com/}. - -If you change the @code{-O3} to @code{-O2} in the above configure line, -you must also remove the @code{-qstrict} option (this is a limitation in -the IBM C compiler). - -If you are using @code{gcc} or @code{egcs} to compile MySQL, you -@strong{must} use the @code{-fno-exceptions} flag, as the exception -handling in @code{gcc}/@code{egcs} is not thread-safe! (This is tested with -@code{egcs} 1.1.) There are also some known problems with IBM's assembler, -which may cause it to generate bad code when used with gcc. - -We recommend the following @code{configure} line with @code{egcs} and -@code{gcc 2.95} on AIX: - -@example -CC="gcc -pipe -mcpu=power -Wa,-many" \ -CXX="gcc -pipe -mcpu=power -Wa,-many" \ -CXXFLAGS="-felide-constructors -fno-exceptions -fno-rtti" \ -./configure --prefix=/usr/local/mysql --with-low-memory -@end example - -The @code{-Wa,-many} is necessary for the compile to be successful. IBM is -aware of this problem but is in to hurry to fix it because of the workaround -available. We don't know if the @code{-fno-exceptions} is required with -@code{gcc 2.95}, but as MySQL doesn't use exceptions and the above -option generates faster code, we recommend that you should always use this -option with @code{egcs / gcc}. - -If you get a problem with assembler code try changing the -mcpu=xxx to -match your CPU. Typically power2, power, or powerpc may need to be used, -alternatively you might need to use 604 or 604e. I'm not positive but I -would think using "power" would likely be safe most of the time, even on -a power2 machine. - -If you don't know what your CPU is then do a "uname -m", this will give -you back a string that looks like "000514676700", with a format of -xxyyyyyymmss where xx and ss are always 0's, yyyyyy is a unique system -id and mm is the id of the CPU Planar. A chart of these values can be -found at -@uref{http://publib.boulder.ibm.com/doc_link/en_US/a_doc_lib/cmds/aixcmds5/uname.htm}. -This will give you a machine type and a machine model you can use to -determine what type of CPU you have. - -If you have problems with signals (MySQL dies unexpectedly -under high load) you may have found an OS bug with threads and -signals. In this case you can tell MySQL not to use signals by -configuring with: - -@example -shell> CFLAGS=-DDONT_USE_THR_ALARM CXX=gcc \ - CXXFLAGS="-felide-constructors -fno-exceptions -fno-rtti \ - -DDONT_USE_THR_ALARM" \ - ./configure --prefix=/usr/local/mysql --with-debug --with-low-memory -@end example - -This doesn't affect the performance of MySQL, but has the side -effect that you can't kill clients that are ``sleeping'' on a connection with -@code{mysqladmin kill} or @code{mysqladmin shutdown}. Instead, the client -will die when it issues its next command. - -On some versions of AIX, linking with @code{libbind.a} makes -@code{getservbyname} core dump. This is an AIX bug and should be reported -to IBM. - -For AIX 4.2.1 and gcc you have to do the following changes. - -After configuring, edit @file{config.h} and @file{include/my_config.h} -and change the line that says - -@example -#define HAVE_SNPRINTF 1 -@end example - -to - -@example -#undef HAVE_SNPRINTF -@end example - -And finally, in @file{mysqld.cc} you need to add a prototype for initgoups. - -@example -#ifdef _AIX41 -extern "C" int initgroups(const char *,int); -#endif -@end example - - -@node SunOS, Alpha-DEC-UNIX, IBM-AIX, Other Unix Notes -@subsubsection SunOS 4 Notes - -On SunOS 4, MIT-pthreads is needed to compile MySQL, which in turn -means you will need GNU @code{make}. - -Some SunOS 4 systems have problems with dynamic libraries and @code{libtool}. -You can use the following @code{configure} line to avoid this problem: - -@example -shell> ./configure --disable-shared --with-mysqld-ldflags=-all-static -@end example - -When compiling @code{readline}, you may get warnings about duplicate defines. -These may be ignored. - -When compiling @code{mysqld}, there will be some @code{implicit declaration -of function} warnings. These may be ignored. - - -@node Alpha-DEC-UNIX, Alpha-DEC-OSF1, SunOS, Other Unix Notes -@subsubsection Alpha-DEC-UNIX Notes (Tru64) - -If you are using egcs 1.1.2 on Digital Unix, you should upgrade to gcc -2.95.2, as egcs on DEC has some serious bugs! - -When compiling threaded programs under Digital Unix, the documentation -recommends using the @code{-pthread} option for @code{cc} and @code{cxx} and -the libraries @code{-lmach -lexc} (in addition to @code{-lpthread}). You -should run @code{configure} something like this: - -@example -CC="cc -pthread" CXX="cxx -pthread -O" \ -./configure --with-named-thread-libs="-lpthread -lmach -lexc -lc" -@end example - -When compiling @code{mysqld}, you may see a couple of warnings like this: - -@example -mysqld.cc: In function void handle_connections()': -mysqld.cc:626: passing long unsigned int *' as argument 3 of -accept(int,sockadddr *, int *)' -@end example - -You can safely ignore these warnings. They occur because @code{configure} -can detect only errors, not warnings. - -If you start the server directly from the command-line, you may have problems -with it dying when you log out. (When you log out, your outstanding processes -receive a @code{SIGHUP} signal.) If so, try starting the server like this: - -@example -shell> nohup mysqld [options] & -@end example - -@code{nohup} causes the command following it to ignore any @code{SIGHUP} -signal sent from the terminal. Alternatively, start the server by running -@code{safe_mysqld}, which invokes @code{mysqld} using @code{nohup} for you. -@xref{safe_mysqld, , @code{safe_mysqld}}. - -If you get a problem when compiling mysys/get_opt.c, just remove the -line #define _NO_PROTO from the start of that file! - -If you are using Compac's CC compiler, the following configure line should -work: - -@example -CC="cc -pthread" -CFLAGS="-O4 -ansi_alias -ansi_args -fast -inline speed all -arch host" -CXX="cxx -pthread" -CXXFLAGS="-O4 -ansi_alias -ansi_args -fast -inline speed all -arch host \ --noexceptions -nortti" -export CC CFLAGS CXX CXXFLAGS -./configure \ ---prefix=/usr/local/mysql \ ---with-low-memory \ ---enable-large-files \ ---enable-shared=yes \ ---with-named-thread-libs="-lpthread -lmach -lexc -lc" -gnumake -@end example - -If you get a problem with libtool, when compiling with shared libraries -as above, when linking @code{mysql}, you should be able to get around -this by issuing: - -@example -cd mysql -/bin/sh ../libtool --mode=link cxx -pthread -O3 -DDBUG_OFF \ --O4 -ansi_alias -ansi_args -fast -inline speed \ --speculate all \ -arch host -DUNDEF_HAVE_GETHOSTBYNAME_R \ --o mysql mysql.o readline.o sql_string.o completion_hash.o \ -../readline/libreadline.a -lcurses \ -../libmysql/.libs/libmysqlclient.so -lm -cd .. -gnumake -gnumake install -scripts/mysql_install_db -@end example - - -@node Alpha-DEC-OSF1, SGI-Irix, Alpha-DEC-UNIX, Other Unix Notes -@subsubsection Alpha-DEC-OSF/1 Notes - -If you have problems compiling and have DEC @code{CC} and @code{gcc} -installed, try running @code{configure} like this: - -@example -CC=cc CFLAGS=-O CXX=gcc CXXFLAGS=-O3 \ -./configure --prefix=/usr/local/mysql -@end example - -If you get problems with the @file{c_asm.h} file, you can create and use -a 'dummy' @file{c_asm.h} file with: - -@example -touch include/c_asm.h -CC=gcc CFLAGS=-I./include \ -CXX=gcc CXXFLAGS=-O3 \ -./configure --prefix=/usr/local/mysql -@end example - -Note that the following problems with the @code{ld} program can be fixed -by downloading the latest DEC (Compaq) patch kit from: -@uref{http://ftp.support.compaq.com/public/unix/}. - -On OSF/1 V4.0D and compiler "DEC C V5.6-071 on Digital Unix V4.0 (Rev. 878)" -the compiler had some strange behaviour (undefined @code{asm} symbols). -@code{/bin/ld} also appears to be broken (problems with @code{_exit -undefined} errors occuring while linking @code{mysqld}). On this system, we -have managed to compile MySQL with the following @code{configure} -line, after replacing @code{/bin/ld} with the version from OSF 4.0C: - -@example -CC=gcc CXX=gcc CXXFLAGS=-O3 ./configure --prefix=/usr/local/mysql -@end example - -With the Digital compiler "C++ V6.1-029", the following should work: - -@example -CC=cc -pthread -CFLAGS=-O4 -ansi_alias -ansi_args -fast -inline speed -speculate all \ - -arch host -CXX=cxx -pthread -CXXFLAGS=-O4 -ansi_alias -ansi_args -fast -inline speed -speculate all \ - -arch host -noexceptions -nortti -export CC CFLAGS CXX CXXFLAGS -./configure --prefix=/usr/mysql/mysql --with-mysqld-ldflags=-all-static \ - --disable-shared --with-named-thread-libs="-lmach -lexc -lc" -@end example - -In some versions of OSF/1, the @code{alloca()} function is broken. Fix -this by removing the line in @file{config.h} that defines @code{'HAVE_ALLOCA'}. - -The @code{alloca()} function also may have an incorrect prototype in -@code{/usr/include/alloca.h}. This warning resulting from this can be ignored. - -@code{configure} will use the following thread libraries automatically: -@code{--with-named-thread-libs="-lpthread -lmach -lexc -lc"}. - -When using @code{gcc}, you can also try running @code{configure} like this: - -@example -shell> CFLAGS=-D_PTHREAD_USE_D4 CXX=gcc CXXFLAGS=-O3 ./configure ... -@end example - -If you have problems with signals (MySQL dies unexpectedly -under high load), you may have found an OS bug with threads and -signals. In this case you can tell MySQL not to use signals by -configuring with: - -@example -shell> CFLAGS=-DDONT_USE_THR_ALARM \ - CXXFLAGS=-DDONT_USE_THR_ALARM \ - ./configure ... -@end example - -This doesn't affect the performance of MySQL, but has the side -effect that you can't kill clients that are ``sleeping'' on a connection with -@code{mysqladmin kill} or @code{mysqladmin shutdown}. Instead, the client -will die when it issues its next command. - -With @code{gcc} 2.95.2, you will probably run into the following compile error: - -@example -sql_acl.cc:1456: Internal compiler error in `scan_region', at except.c:2566 -Please submit a full bug report. -@end example - -To fix this you should change to the @code{sql} directory and do a ``cut -and paste'' of the last @code{gcc} line, but change @code{-O3} to -@code{-O0} (or add @code{-O0} immediately after @code{gcc} if you don't -have any @code{-O} option on your compile line). After this is done you -can just change back to the top-level directly and run @code{make} -again. - - -@node SGI-Irix, Caldera, Alpha-DEC-OSF1, Other Unix Notes -@subsubsection SGI Irix Notes - -If you are using Irix Version 6.5.3 or newer @code{mysqld} will only be able to -create threads if you run it as a user with @code{CAP_SCHED_MGT} -privileges (like @code{root}) or give the @code{mysqld} server this privilege -with the following shell command: - -@example -shell> chcap "CAP_SCHED_MGT+epi" /opt/mysql/libexec/mysqld -@end example - -You may have to undefine some things in @file{config.h} after running -@code{configure} and before compiling. - -In some Irix implementations, the @code{alloca()} function is broken. If the -@code{mysqld} server dies on some @code{SELECT} statements, remove the lines -from @file{config.h} that define @code{HAVE_ALLOC} and @code{HAVE_ALLOCA_H}. -If @code{mysqladmin create} doesn't work, remove the line from @file{config.h} -that defines @code{HAVE_READDIR_R}. You may have to remove the -@code{HAVE_TERM_H} line as well. - -SGI recommends that you install all of the patches on this page as a set: -@uref{http://support.sgi.com/surfzone/patches/patchset/6.2_indigo.rps.html} - -At the very minimum, you should install the latest kernel rollup, the -latest @code{rld} rollup, and the latest @code{libc} rollup. - -You definitely need all the POSIX patches on this page, for pthreads support: - -@uref{http://support.sgi.com/surfzone/patches/patchset/6.2_posix.rps.html} - -If you get the something like the following error when compiling -@file{mysql.cc}: - -@example -"/usr/include/curses.h", line 82: error(1084): invalid combination of type -@end example - -Type the following in the top-level directory of your MySQL source -tree: - -@example -shell> extra/replace bool curses_bool < /usr/include/curses.h \ -> include/curses.h -shell> make -@end example - -There have also been reports of scheduling problems. If only one thread is -running, things go slow. Avoid this by starting another client. This may -lead to a 2-to-10-fold increase in execution speed thereafter for the other -thread. This is a poorly understood problem with Irix threads; you may have -to improvise to find solutions until this can be fixed. - -If you are compiling with @code{gcc}, you can use the following -@code{configure} command: - -@example -CC=gcc CXX=gcc CXXFLAGS=-O3 \ -./configure --prefix=/usr/local/mysql --enable-thread-safe-client \ ---with-named-thread-libs=-lpthread -@end example - -On Irix 6.5.11 with native Irix C and C++ compilers ver. 7.3.1.2, the -following is reported to work - -@example -CC=cc CXX=CC CFLAGS='-O3 -n32 -TARG:platform=IP22 -I/usr/local/include \ --L/usr/local/lib' CXXFLAGS='-O3 -n32 -TARG:platform=IP22 \ --I/usr/local/include -L/usr/local/lib' ./configure \ ---prefix=/usr/local/mysql --with-innodb --with-berkeley-db \ ---with-libwrap=/usr/local \ ---with-named-curses-libs=/usr/local/lib/libncurses.a -@end example - - -@node Caldera, Caldera Unixware, SGI-Irix, Other Unix Notes -@subsubsection Caldera (SCO) Notes - -The current port is tested only on a ``sco3.2v5.0.4'' and -``sco3.2v5.0.5'' system. There has also been a lot of progress on a -port to ``sco 3.2v4.2''. - -For the moment the recommended compiler on OpenServer is gcc 2.95.2. With this -you should be able to compile MySQL with just: - -@example -CC=gcc CXX=gcc ./configure ... (options) -@end example - -@enumerate -@item -For OpenServer 5.0.X you need to use gcc-2.95.2p1 or newer from the -Skunkware. http://www.caldera.com/skunkware/ and choose browser -OpenServer packages or by ftp to ftp2.caldera.com in the -pub/skunkware/osr5/devtools/gcc directory. - -@item -You need the port of GCC 2.5.x for this product and the Development -system. They are required on this version of Caldera (SCO) Unix. You cannot -just use the GCC Dev system. - -@item -You should get the FSU Pthreads package and install it first. This can be -found at -@uref{http://www.cs.wustl.edu/~schmidt/ACE_wrappers/FSU-threads.tar.gz}. -You can also get a precompiled package from -@uref{http://www.mysql.com/Downloads/SCO/FSU-threads-3.5c.tar.gz}. - -@item -FSU Pthreads can be compiled with Caldera (SCO) Unix 4.2 with tcpip. Or -OpenServer 3.0 or Open Desktop 3.0 (OS 3.0 ODT 3.0), with the Caldera (SCO) -Development System installed using a good port of GCC 2.5.x ODT or OS -3.0 you will need a good port of GCC 2.5.x There are a lot of problems -without a good port. The port for this product requires the SCO Unix -Development system. Without it, you are missing the libraries and the -linker that is needed. - -@item -To build FSU Pthreads on your system, do the following: - -@enumerate a -@item -Run @code{./configure} in the @file{threads/src} directory and select -the SCO OpenServer option. This command copies @file{Makefile.SCO5} to -@file{Makefile}. - -@item -Run @code{make}. - -@item -To install in the default @file{/usr/include} directory, login as root, -then @code{cd} to the @file{thread/src} directory, and run @code{make -install}. -@end enumerate - -@item -Remember to use GNU @code{make} when making MySQL. - -@item -If you don't start @code{safe_mysqld} as root, you probably will get only the -default 110 open files per process. @code{mysqld} will write a note about this -in the log file. - -@item -With SCO 3.2V5.0.5, you should use FSU Pthreads version 3.5c or newer. -You should also use gcc 2.95.2 or newer! - -The following @code{configure} command should work: - -@example -shell> ./configure --prefix=/usr/local/mysql --disable-shared -@end example - -@item -With SCO 3.2V4.2, you should use FSU Pthreads version 3.5c or newer. -The following @code{configure} command should work: - -@example -shell> CFLAGS="-D_XOPEN_XPG4" CXX=gcc CXXFLAGS="-D_XOPEN_XPG4" \ - ./configure \ - --prefix=/usr/local/mysql \ - --with-named-thread-libs="-lgthreads -lsocket -lgen -lgthreads" \ - --with-named-curses-libs="-lcurses" -@end example - -You may get some problems with some include files. In this case, you can -find new SCO-specific include files at -@uref{http://www.mysql.com/Downloads/SCO/SCO-3.2v4.2-includes.tar.gz}. -You should unpack this file in the @file{include} directory of your -MySQL source tree. -@end enumerate - -Caldera (SCO) development notes: - -@itemize @bullet -@item -MySQL should automatically detect FSU Pthreads and link @code{mysqld} -with @code{-lgthreads -lsocket -lgthreads}. - -@item -The Caldera (SCO) development libraries are re-entrant in FSU Pthreads. -Caldera claim sthat its libraries' functions are re-entrant, so they must -be reentrant with FSU Pthreads. FSU Pthreads on OpenServer tries to use -the SCO scheme to make re-entrant libraries. - -@item -FSU Pthreads (at least the version at @uref{http://www.mysql.com/}) comes -linked with GNU @code{malloc}. If you encounter problems with memory usage, -make sure that @file{gmalloc.o} is included in @file{libgthreads.a} and -@file{libgthreads.so}. - -@item -In FSU Pthreads, the following system calls are pthreads-aware: @code{read()}, -@code{write()}, @code{getmsg()}, @code{connect()}, @code{accept()}, -@code{select()}, and @code{wait()}. - -@item -The CSSA-2001-SCO.35.2 (the patch is listed in custom as -erg711905-dscr_remap security patch (version 2.0.0) breaks FSU threads and -makes mysqld unstable. You have to remove this one if you want to run -mysqld on an OpenServer 5.0.6 machine. -@end itemize - -If you want to install DBI on Caldera (SCO), you have to edit the -@file{Makefile} in DBI-xxx and each subdirectory. - -Note that the following assumes gcc 2.95.2 or newer: - -@example -OLD: NEW: -CC = cc CC = gcc -CCCDLFLAGS = -KPIC -W1,-Bexport CCCDLFLAGS = -fpic -CCDLFLAGS = -wl,-Bexport CCDLFLAGS = - -LD = ld LD = gcc -G -fpic -LDDLFLAGS = -G -L/usr/local/lib LDDLFLAGS = -L/usr/local/lib -LDFLAGS = -belf -L/usr/local/lib LDFLAGS = -L/usr/local/lib - -LD = ld LD = gcc -G -fpic -OPTIMISE = -Od OPTIMISE = -O1 - -OLD: -CCCFLAGS = -belf -dy -w0 -U M_XENIX -DPERL_SCO5 -I/usr/local/include - -NEW: -CCFLAGS = -U M_XENIX -DPERL_SCO5 -I/usr/local/include -@end example - -This is because the Perl dynaloader will not load the @code{DBI} modules -if they were compiled with @code{icc} or @code{cc}. - -Perl works best when compiled with @code{cc}. - - -@node Caldera Unixware, , Caldera, Other Unix Notes -@subsubsection Caldera (SCO) Unixware Version 7.0 Notes - -You must use a version of MySQL at least as recent as Version 3.22.13 -because that version fixes some portability problems under Unixware. - -We have been able to compile MySQL with the following @code{configure} -command on Unixware Version 7.0.1: - -@example -CC=cc CXX=CC ./configure --prefix=/usr/local/mysql -@end example - -If you want to use @code{gcc}, you must use @code{gcc} 2.95.2 or newer. - -Caldera provides libsocket.so.2 at -@uref{ftp://stage.caldera.com/pub/security/tools} for -pre-OSR506 security fixes. Also, the telnetd fix at -@url{ftp://stage.caldera.com/pub/security/openserver/CSSA-2001-SCO.10/} -as both libsocket.so.2 and libresolv.so.1 with instructions for -installing on pre-OSR506 systems. - -It's probably a good idea to install the above patches before trying to -compile/use MySQL. - -@node OS/2, BeOS, Other Unix Notes, Operating System Specific Notes -@subsection OS/2 Notes - -MySQL uses quite a few open files. Because of this, you should add -something like the following to your @file{CONFIG.SYS} file: - -@example -SET EMXOPT=-c -n -h1024 -@end example - -If you don't do this, you will probably run into the following error: - -@example -File 'xxxx' not found (Errcode: 24) -@end example - -When using MySQL with OS/2 Warp 3, FixPack 29 or above is -required. With OS/2 Warp 4, FixPack 4 or above is required. This is a -requirement of the Pthreads library. MySQL must be installed -in a partition that supports long filenames such as HPFS, FAT32, etc. - -The @file{INSTALL.CMD} script must be run from OS/2's own @file{CMD.EXE} -and may not work with replacement shells such as @file{4OS2.EXE}. - -The @file{scripts/mysql-install-db} script has been renamed. It is now called -@file{install.cmd} and is a REXX script, which will set up the default -MySQL security settings and create the WorkPlace Shell icons -for MySQL. - -Dynamic module support is compiled in but not fully tested. Dynamic -modules should be compiled using the Pthreads run-time library. - -@example -gcc -Zdll -Zmt -Zcrtdll=pthrdrtl -I../include -I../regex -I.. \ - -o example udf_example.cc -L../lib -lmysqlclient udf_example.def -mv example.dll example.udf -@end example - -@strong{Note}: Due to limitations in OS/2, UDF module name stems must not -exceed 8 characters. Modules are stored in the @file{/mysql2/udf} -directory; the @code{safe-mysqld.cmd} script will put this directory in -the @code{BEGINLIBPATH} environment variable. When using UDF modules, -specified extensions are ignored@-it is assumed to be @file{.udf}. -For example, in Unix, the shared module might be named @file{example.so} -and you would load a function from it like this: - -@example -mysql> CREATE FUNCTION metaphon RETURNS STRING SONAME "example.so"; -@end example - -Is OS/2, the module would be named @file{example.udf}, but you would not -specify the module extension: - -@example -mysql> CREATE FUNCTION metaphon RETURNS STRING SONAME "example"; -@end example - - -@node BeOS, Novell Netware, OS/2, Operating System Specific Notes -@subsection BeOS Notes - -We are really interested in getting MySQL to work on BeOS, but -unfortunately we don't have any person who knows BeOS or has time to do -a port. - -We are interested in finding someone to do a port, and we will help them -with any technical questions they may have while doing the port. - -We have previously talked with some BeOS developers that have said that -MySQL is 80% ported to BeOS, but we haven't heard from them -in a while. - - -@node Novell Netware, , BeOS, Operating System Specific Notes -@subsection Novell NetWare Notes - -We are really interested in getting MySQL to work on NetWare, but -unfortunately we don't have any person who knows NetWare or has time to do -a port. - -We are interested in finding someone to do a port, and we will help them -with any technical questions they may have while doing the port. - - - -@node Perl support, , Operating System Specific Notes, Installing -@section Perl Installation Comments - -@cindex Perl, installing -@cindex installing, Perl - -@menu -* Perl installation:: Installing Perl on Unix -* ActiveState Perl:: Installing ActiveState Perl on Windows -* Windows Perl:: Installing the MySQL Perl distribution on Windows -* Perl support problems:: Problems using the Perl @code{DBI}/@code{DBD} interface -@end menu - - -@node Perl installation, ActiveState Perl, Perl support, Perl support -@subsection Installing Perl on Unix - -Perl support for MySQL is provided by means of the -@code{DBI}/@code{DBD} client interface. @xref{Perl}. The Perl -@code{DBD}/@code{DBI} client code requires Perl Version 5.004 or later. The -interface @strong{will not work} if you have an older version of Perl. - -MySQL Perl support also requires that you've installed -MySQL client programming support. If you installed MySQL -from RPM files, client programs are in the client RPM, but client programming -support is in the developer RPM. Make sure you've installed the latter RPM. - -As of Version 3.22.8, Perl support is distributed separately from the main -MySQL distribution. If you want to install Perl support, the files -you will need can be obtained from -@uref{http://www.mysql.com/Downloads/Contrib/}. - -The Perl distributions are provided as compressed @code{tar} archives and -have names like @file{MODULE-VERSION.tar.gz}, where @code{MODULE} is the -module name and @code{VERSION} is the version number. You should get the -@code{Data-Dumper}, @code{DBI}, and @code{Msql-Mysql-modules} distributions -and install them in that order. The installation procedure is shown here. -The example shown is for the @code{Data-Dumper} module, but the procedure is -the same for all three distributions: - -@enumerate -@item -Unpack the distribution into the current directory: -@example -shell> gunzip < Data-Dumper-VERSION.tar.gz | tar xvf - -@end example -This command creates a directory named @file{Data-Dumper-VERSION}. - -@item -Change into the top-level directory of the unpacked distribution: -@example -shell> cd Data-Dumper-VERSION -@end example - -@item -Build the distribution and compile everything: -@example -shell> perl Makefile.PL -shell> make -shell> make test -shell> make install -@end example -@end enumerate - -The @code{make test} command is important because it verifies that the -module is working. Note that when you run that command during the -@code{Msql-Mysql-modules} installation to exercise the interface code, the -MySQL server must be running or the test will fail. - -It is a good idea to rebuild and reinstall the @code{Msql-Mysql-modules} -distribution whenever you install a new release of MySQL, -particularly if you notice symptoms such as all your @code{DBI} scripts -dumping core after you upgrade MySQL. - -If you don't have the right to install Perl modules in the system directory -or if you to install local Perl modules, the following reference may help -you: - -@example -@uref{http://www.iserver.com/support/contrib/perl5/modules.html} -@end example - -Look under the heading -@code{Installing New Modules that Require Locally Installed Modules}. - - -@node ActiveState Perl, Windows Perl, Perl installation, Perl support -@subsection Installing ActiveState Perl on Windows - -@cindex installing, Perl on Windows -@cindex Perl, installing on Windows -@cindex ActiveState Perl - -To install the MySQL @code{DBD} module with ActiveState Perl on -Windows, you should do the following: - -@itemize @bullet -@item -Get ActiveState Perl from -@uref{http://www.activestate.com/Products/ActivePerl/} -and install it. - -@item -Open a DOS shell. - -@item -If required, set the HTTP_proxy variable. For example, you might try: - -@example -set HTTP_proxy=my.proxy.com:3128 -@end example - -@item -Start the PPM program: - -@example -C:\> c:\perl\bin\ppm.pl -@end example - -@item -If you have not already done so, install @code{DBI}: - -@example -ppm> install DBI -@end example - -@item -If this succeeds, run the following command: - -@example -install \ -ftp://ftp.de.uu.net/pub/CPAN/authors/id/JWIED/DBD-mysql-1.2212.x86.ppd -@end example -@end itemize - -The above should work at least with ActiveState Perl Version 5.6. - -If you can't get the above to work, you should instead install the -@code{MyODBC} driver and connect to MySQL server through -ODBC: - -@example -use DBI; -$dbh= DBI->connect("DBI:ODBC:$dsn","$user","$password") || - die "Got error $DBI::errstr when connecting to $dsn\n"; -@end example - - -@node Windows Perl, Perl support problems, ActiveState Perl, Perl support -@subsection Installing the MySQL Perl Distribution on Windows - -The MySQL Perl distribution contains @code{DBI}, -@code{DBD:MySQL} and @code{DBD:ODBC}. - -@itemize @bullet -@item -Get the Perl distribution for Windows from -@uref{http://www.mysql.com/download.html}. - -@item -Unzip the distribution in @code{C:} so that you get a @file{C:\PERL} directory. - -@item -Add the directory @file{C:\PERL\BIN} to your path. - -@item -Add the directory @file{C:\PERL\BIN\MSWIN32-x86-thread} or -@file{C:\PERL\BIN\MSWIN32-x86} to your path. - -@item -Test that @code{perl} works by executing @code{perl -v} in a DOS shell. -@end itemize - - -@node Perl support problems, , Windows Perl, Perl support -@subsection Problems Using the Perl @code{DBI}/@code{DBD} Interface - -@cindex problems, installing Perl -@cindex Perl DBI/DBD, installation problems - -If Perl reports that it can't find the @file{../mysql/mysql.so} module, -then the problem is probably that Perl can't locate the shared library -@file{libmysqlclient.so}. - -You can fix this by any of the following methods: - -@itemize @bullet -@item -Compile the @code{Msql-Mysql-modules} distribution with @code{perl -Makefile.PL -static -config} rather than @code{perl Makefile.PL}. - -@item -Copy @file{libmysqlclient.so} to the directory where your other shared -libraries are located (probably @file{/usr/lib} or @file{/lib}). - -@item -On Linux you can add the pathname of the directory where -@file{libmysqlclient.so} is located to the @file{/etc/ld.so.conf} file. - -@tindex LD_RUN_PATH environment variable -@tindex Environment variable, LD_RUN_PATH -@item -Add the pathname of the directory where @file{libmysqlclient.so} is located -to the @code{LD_RUN_PATH} environment variable. -@end itemize - -If you get the following errors from @code{DBD-mysql}, -you are probably using @code{gcc} (or using an old binary compiled with -@code{gcc}): - -@example -/usr/bin/perl: can't resolve symbol '__moddi3' -/usr/bin/perl: can't resolve symbol '__divdi3' -@end example - -Add @code{-L/usr/lib/gcc-lib/... -lgcc} to the link command when the -@file{mysql.so} library gets built (check the output from @code{make} for -@file{mysql.so} when you compile the Perl client). The @code{-L} option -should specify the pathname of the directory where @file{libgcc.a} is located -on your system. - -Another cause of this problem may be that Perl and MySQL aren't both -compiled with @code{gcc}. In this case, you can solve the mismatch by -compiling both with @code{gcc}. - -If you get the following error from @code{Msql-Mysql-modules} -when you run the tests: - -@example -t/00base............install_driver(mysql) failed: -Can't load '../blib/arch/auto/DBD/mysql/mysql.so' for module DBD::mysql: -../blib/arch/auto/DBD/mysql/mysql.so: undefined symbol: -uncompress at /usr/lib/perl5/5.00503/i586-linux/DynaLoader.pm line 169. -@end example - -it means that you need to include the compression library, -lz, to the -link line. This can be doing the following change in the file -@file{lib/DBD/mysql/Install.pm}: - -@example -$sysliblist .= " -lm"; - -to - -$sysliblist .= " -lm -lz"; -@end example - -After this, you @strong{must} run 'make realclean' and then proceed with the -installation from the beginning. - -If you want to use the Perl module on a system that doesn't support -dynamic linking (like Caldera/SCO) you can generate a static version of -Perl that includes @code{DBI} and @code{DBD-mysql}. The way this works -is that you generate a version of Perl with the @code{DBI} code linked -in and install it on top of your current Perl. Then you use that to -build a version of Perl that additionally has the @code{DBD} code linked -in, and install that. - -On Caldera (SCO), you must have the following environment variables set: - -@example -shell> LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/lib:/usr/progressive/lib -or -shell> LD_LIBRARY_PATH=/usr/lib:/lib:/usr/local/lib:/usr/ccs/lib:\ -/usr/progressive/lib:/usr/skunk/lib -shell> LIBPATH=/usr/lib:/lib:/usr/local/lib:/usr/ccs/lib:\ -/usr/progressive/lib:/usr/skunk/lib -shell> MANPATH=scohelp:/usr/man:/usr/local1/man:/usr/local/man:\ -/usr/skunk/man: -@end example - -First, create a Perl that includes a statically linked @code{DBI} by running -these commands in the directory where your @code{DBI} distribution is -located: - -@example -shell> perl Makefile.PL -static -config -shell> make -shell> make install -shell> make perl -@end example - -Then you must install the new Perl. The output of @code{make perl} will -indicate the exact @code{make} command you will need to execute to perform -the installation. On Caldera (SCO), this is -@code{make -f Makefile.aperl inst_perl MAP_TARGET=perl}. - -Next, use the just-created Perl to create another Perl that also includes a -statically-linked @code{DBD::mysql} by running these commands in the -directory where your @code{Msql-Mysql-modules} distribution is located: - -@example -shell> perl Makefile.PL -static -config -shell> make -shell> make install -shell> make perl -@end example - -Finally, you should install this new Perl. Again, the output of @code{make -perl} indicates the command to use. - - - - -@node Tutorial, MySQL Database Administration, Installing, Top -@chapter Tutorial Introduction - -@cindex tutorial -@cindex terminal monitor, defined -@cindex monitor, terminal -@cindex options, provided by MySQL - -@menu -* Connecting-disconnecting:: Connecting to and disconnecting from the server -* Entering queries:: Entering queries -* Database use:: Creating and using a database -* Getting information:: Getting information about databases and tables -* Examples:: Examples -* Batch mode:: Using @code{mysql} in batch mode -* Twin:: Queries from twin project -* Apache:: Using MySQL with Apache -@end menu - -This chapter provides a tutorial introduction to MySQL by showing -how to use the @code{mysql} client program to create and use a simple -database. @code{mysql} (sometimes referred to as the ``terminal monitor'' or -just ``monitor'') is an interactive program that allows you to connect to a -MySQL server, run queries, and view the results. @code{mysql} may -also be used in batch mode: you place your queries in a file beforehand, then -tell @code{mysql} to execute the contents of the file. Both ways of using -@code{mysql} are covered here. - -To see a list of options provided by @code{mysql}, invoke it with -the @code{--help} option: - -@example -shell> mysql --help -@end example - -This chapter assumes that @code{mysql} is installed on your machine and that -a MySQL server is available to which you can connect. If this is -not true, contact your MySQL administrator. (If @strong{you} are the -administrator, you will need to consult other sections of this manual.) - -This chapter describes the entire process of setting up and using a -database. If you are interested only in accessing an already-existing -database, you may want to skip over the sections that describe how to -create the database and the tables it contains. - -Because this chapter is tutorial in nature, many details are necessarily left -out. Consult the relevant sections of the manual for more -information on the topics covered here. - - -@node Connecting-disconnecting, Entering queries, Tutorial, Tutorial -@section Connecting to and Disconnecting from the Server - -@cindex connecting, to the server -@cindex disconnecting, from the server -@cindex server, connecting -@cindex server, disconnecting - -To connect to the server, you'll usually need to provide a MySQL -user name when you invoke @code{mysql} and, most likely, a password. If the -server runs on a machine other than the one where you log in, you'll also -need to specify a hostname. Contact your administrator to find out what -connection parameters you should use to connect (that is, what host, user name, -and password to use). Once you know the proper parameters, you should be -able to connect like this: - -@example -shell> mysql -h host -u user -p -Enter password: ******** -@end example - -The @code{********} represents your password; enter it when @code{mysql} -displays the @code{Enter password:} prompt. - -If that works, you should see some introductory information followed by a -@code{mysql>} prompt: - - -@example -shell> mysql -h host -u user -p -Enter password: ******** -Welcome to the MySQL monitor. Commands end with ; or \g. -Your MySQL connection id is 459 to server version: 3.22.20a-log - -Type 'help' for help. - -mysql> -@end example - -The prompt tells you that @code{mysql} is ready for you to enter commands. - -Some MySQL installations allow users to connect as the anonymous -(unnamed) user to the server running on the local host. If this is the case -on your machine, you should be able to connect to that server by invoking -@code{mysql} without any options: - -@example -shell> mysql -@end example - -After you have connected successfully, you can disconnect any time by typing -@code{QUIT} at the @code{mysql>} prompt: - -@example -mysql> QUIT -Bye -@end example - -You can also disconnect by pressing Control-D. - -Most examples in the following sections assume you are connected to the -server. They indicate this by the @code{mysql>} prompt. - - -@node Entering queries, Database use, Connecting-disconnecting, Tutorial -@section Entering Queries - -@cindex running, queries -@cindex queries, entering -@cindex entering, queries - -Make sure you are connected to the server, as discussed in the previous -section. Doing so will not in itself select any database to work with, but -that's okay. At this point, it's more important to find out a little about -how to issue queries than to jump right in creating tables, loading data -into them, and retrieving data from them. This section describes the basic -principles of entering commands, using several queries you can try out to -familiarise yourself with how @code{mysql} works. - -Here's a simple command that asks the server to tell you its version number -and the current date. Type it in as shown here following the @code{mysql>} -prompt and press Enter: - -@example -mysql> SELECT VERSION(), CURRENT_DATE; -+--------------+--------------+ -| VERSION() | CURRENT_DATE | -+--------------+--------------+ -| 3.22.20a-log | 1999-03-19 | -+--------------+--------------+ -1 row in set (0.01 sec) -mysql> -@end example - -This query illustrates several things about @code{mysql}: - -@itemize @bullet -@item -A command normally consists of a SQL statement followed by a semicolon. -(There are some exceptions where a semicolon is not needed. @code{QUIT}, -mentioned earlier, is one of them. We'll get to others later.) - -@item -When you issue a command, @code{mysql} sends it to the server for execution -and displays the results, then prints another @code{mysql>} to indicate -that it is ready for another command. - -@item -@code{mysql} displays query output as a table (rows and columns). The first -row contains labels for the columns. The rows following are the query -results. Normally, column labels are the names of the columns you fetch from -database tables. If you're retrieving the value of an expression rather than -a table column (as in the example just shown), @code{mysql} labels the column -using the expression itself. - -@item -@code{mysql} shows how many rows were returned and how long the query took -to execute, which gives you a rough idea of server performance. These values -are imprecise because they represent wall clock time (not CPU or machine -time), and because they are affected by factors such as server load and -network latency. (For brevity, the ``rows in set'' line is not shown in -the remaining examples in this chapter.) -@end itemize - -Keywords may be entered in any lettercase. The following queries are -equivalent: - -@example -mysql> SELECT VERSION(), CURRENT_DATE; -mysql> select version(), current_date; -mysql> SeLeCt vErSiOn(), current_DATE; -@end example - -Here's another query. It demonstrates that you can use @code{mysql} as a -simple calculator: - -@example -mysql> SELECT SIN(PI()/4), (4+1)*5; -+-------------+---------+ -| SIN(PI()/4) | (4+1)*5 | -+-------------+---------+ -| 0.707107 | 25 | -+-------------+---------+ -@end example - -The commands shown thus far have been relatively short, single-line -statements. You can even enter multiple statements on a single line. -Just end each one with a semicolon: - -@example -mysql> SELECT VERSION(); SELECT NOW(); -+--------------+ -| VERSION() | -+--------------+ -| 3.22.20a-log | -+--------------+ - -+---------------------+ -| NOW() | -+---------------------+ -| 1999-03-19 00:15:33 | -+---------------------+ -@end example - -A command need not be given all on a single line, so lengthy commands that -require several lines are not a problem. @code{mysql} determines where your -statement ends by looking for the terminating semicolon, not by looking for -the end of the input line. (In other words, @code{mysql} -accepts free-format input: it collects input lines but does not execute them -until it sees the semicolon.) - -Here's a simple multiple-line statement: - -@example -mysql> SELECT - -> USER() - -> , - -> CURRENT_DATE; -+--------------------+--------------+ -| USER() | CURRENT_DATE | -+--------------------+--------------+ -| joesmith@@localhost | 1999-03-18 | -+--------------------+--------------+ -@end example - -In this example, notice how the prompt changes from @code{mysql>} to -@code{->} after you enter the first line of a multiple-line query. This is -how @code{mysql} indicates that it hasn't seen a complete statement and is -waiting for the rest. The prompt is your friend, because it provides -valuable feedback. If you use that feedback, you will always be aware of -what @code{mysql} is waiting for. - -If you decide you don't want to execute a command that you are in the -process of entering, cancel it by typing @code{\c}: - -@example -mysql> SELECT - -> USER() - -> \c -mysql> -@end example - -Here, too, notice the prompt. It switches back to @code{mysql>} after you -type @code{\c}, providing feedback to indicate that @code{mysql} is ready -for a new command. - -The following table shows each of the prompts you may see and summarises what -they mean about the state that @code{mysql} is in: - -@cindex prompts, meanings -@multitable @columnfractions .10 .80 -@item @strong{Prompt} @tab @strong{Meaning} -@item @code{mysql>} @tab Ready for new command. -@item @code{@ @ @ @ ->} @tab Waiting for next line of multiple-line command. -@item @code{@ @ @ @ '>} @tab Waiting for next line, collecting a string that begins -with a single quote (@samp{'}). -@item @code{@ @ @ @ ">} @tab Waiting for next line, collecting a string that begins -with a double quote (@samp{"}). -@end multitable - -Multiple-line statements commonly occur by accident when you intend to -issue a command on a single line, but forget the terminating semicolon. In -this case, @code{mysql} waits for more input: - -@example -mysql> SELECT USER() - -> -@end example - -If this happens to you (you think you've entered a statement but the only -response is a @code{->} prompt), most likely @code{mysql} is waiting for the -semicolon. If you don't notice what the prompt is telling you, you might sit -there for a while before realising what you need to do. Enter a semicolon to -complete the statement, and @code{mysql} will execute it: - -@example -mysql> SELECT USER() - -> ; -+--------------------+ -| USER() | -+--------------------+ -| joesmith@@localhost | -+--------------------+ -@end example - -The @code{'>} and @code{">} prompts occur during string collection. -In MySQL, you can write strings surrounded by either @samp{'} -or @samp{"} characters (for example, @code{'hello'} or @code{"goodbye"}), -and @code{mysql} lets you enter strings that span multiple lines. When you -see a @code{'>} or @code{">} prompt, it means that you've entered a line -containing a string that begins with a @samp{'} or @samp{"} quote character, -but have not yet entered the matching quote that terminates the string. -That's fine if you really are entering a multiple-line string, but how likely -is that? Not very. More often, the @code{'>} and @code{">} prompts indicate -that you've inadvertantly left out a quote character. For example: - -@example -mysql> SELECT * FROM my_table WHERE name = "Smith AND age < 30; - "> -@end example - -If you enter this @code{SELECT} statement, then press Enter and wait for the -result, nothing will happen. Instead of wondering why this -query takes so long, notice the clue provided by the @code{">} prompt. It -tells you that @code{mysql} expects to see the rest of an unterminated -string. (Do you see the error in the statement? The string @code{"Smith} is -missing the second quote.) - -At this point, what do you do? The simplest thing is to cancel the command. -However, you cannot just type @code{\c} in this case, because @code{mysql} -interprets it as part of the string that it is collecting! Instead, enter -the closing quote character (so @code{mysql} knows you've finished the -string), then type @code{\c}: - -@example -mysql> SELECT * FROM my_table WHERE name = "Smith AND age < 30; - "> "\c -mysql> -@end example - -The prompt changes back to @code{mysql>}, indicating that @code{mysql} -is ready for a new command. - -It's important to know what the @code{'>} and @code{">} prompts signify, -because if you mistakenly enter an unterminated string, any further lines you -type will appear to be ignored by @code{mysql}@-including a line -containing @code{QUIT}! This can be quite confusing, especially if you -don't know that you need to supply the terminating quote before you can -cancel the current command. - - -@node Database use, Getting information, Entering queries, Tutorial -@section Creating and Using a Database - -@cindex databases, creating -@cindex databases, using -@cindex creating, databases - -@menu -* Creating database:: Creating a database -* Creating tables:: Creating a table -* Loading tables:: Loading data into a table -* Retrieving data:: Retrieving information from a table -@end menu - -Now that you know how to enter commands, it's time to access a database. - -Suppose you have several pets in your home (your menagerie) and you'd -like to keep track of various types of information about them. You can do so -by creating tables to hold your data and loading them with the desired -information. Then you can answer different sorts of questions about your -animals by retrieving data from the tables. This section shows you how to: - -@itemize @bullet -@item -Create a database -@item -Create a table -@item -Load data into the table -@item -Retrieve data from the table in various ways -@item -Use multiple tables -@end itemize - -The menagerie database will be simple (deliberately), but it is not difficult -to think of real-world situations in which a similar type of database might -be used. For example, a database like this could be used by a farmer to keep -track of livestock, or by a veterinarian to keep track of patient records. -A menagerie distribution containing some of the queries and sample data used -in the following sections can be obtained from the MySQL web site. -It's available in either compressed @code{tar} format -(@uref{http://www.mysql.com/Downloads/Contrib/Examples/menagerie.tar.gz}) -or Zip format -(@uref{http://www.mysql.com/Downloads/Contrib/Examples/menagerie.zip}). - -Use the @code{SHOW} statement to find out what databases currently exist -on the server: - -@example -mysql> SHOW DATABASES; -+----------+ -| Database | -+----------+ -| mysql | -| test | -| tmp | -+----------+ -@end example - -The list of databases is probably different on your machine, but the -@code{mysql} and @code{test} databases are likely to be among them. The -@code{mysql} database is required because it describes user access -privileges. The @code{test} database is often provided as a workspace for -users to try things out. - -Note that you may not see all databases if you don't have the -@code{SHOW DATABASES} privilege. @xref{GRANT}. - -If the @code{test} database exists, try to access it: - -@example -mysql> USE test -Database changed -@end example - -Note that @code{USE}, like @code{QUIT}, does not require a semicolon. (You -can terminate such statements with a semicolon if you like; it does no harm.) -The @code{USE} statement is special in another way, too: it must be given on -a single line. - -You can use the @code{test} database (if you have access to it) for the -examples that follow, but anything you create in that database can be -removed by anyone else with access to it. For this reason, you should -probably ask your MySQL administrator for permission to use a -database of your own. Suppose you want to call yours @code{menagerie}. The -administrator needs to execute a command like this: - -@example -mysql> GRANT ALL ON menagerie.* TO your_mysql_name; -@end example - -where @code{your_mysql_name} is the MySQL user name assigned to -you. - - -@node Creating database, Creating tables, Database use, Database use -@subsection Creating and Selecting a Database - -@cindex selecting, databases -@cindex databases, selecting - -If the administrator creates your database for you when setting up your -permissions, you can begin using it. Otherwise, you need to create it -yourself: - -@example -mysql> CREATE DATABASE menagerie; -@end example - -Under Unix, database names are case-sensitive (unlike SQL keywords), so you -must always refer to your database as @code{menagerie}, not as -@code{Menagerie}, @code{MENAGERIE}, or some other variant. This is also true -for table names. (Under Windows, this restriction does not apply, although -you must refer to databases and tables using the same lettercase throughout a -given query.) - -Creating a database does not select it for use; you must do that explicitly. -To make @code{menagerie} the current database, use this command: - -@example -mysql> USE menagerie -Database changed -@end example - -Your database needs to be created only once, but you must select it for use -each time you begin a @code{mysql} session. You can do this by issuing a -@code{USE} statement as shown above. Alternatively, you can select the -database on the command-line when you invoke @code{mysql}. Just specify its -name after any connection parameters that you might need to provide. For -example: - -@example -shell> mysql -h host -u user -p menagerie -Enter password: ******** -@end example - -Note that @code{menagerie} is not your password on the command just shown. -If you want to supply your password on the command-line after the @code{-p} -option, you must do so with no intervening space (for example, as -@code{-pmypassword}, not as @code{-p mypassword}). However, putting your -password on the command-line is not recommended, because doing so exposes it -to snooping by other users logged in on your machine. - - -@node Creating tables, Loading tables, Creating database, Database use -@subsection Creating a Table - -@cindex tables, creating -@cindex creating, tables - -Creating the database is the easy part, but at this point it's empty, as -@code{SHOW TABLES} will tell you: - -@example -mysql> SHOW TABLES; -Empty set (0.00 sec) -@end example - -The harder part is deciding what the structure of your database should be: -what tables you will need and what columns will be in each of them. - -You'll want a table that contains a record for each of your pets. This can -be called the @code{pet} table, and it should contain, as a bare minimum, -each animal's name. Because the name by itself is not very interesting, the -table should contain other information. For example, if more than one person -in your family keeps pets, you might want to list each animal's owner. You -might also want to record some basic descriptive information such as species -and sex. - -How about age? That might be of interest, but it's not a good thing to store -in a database. Age changes as time passes, which means you'd have to update -your records often. Instead, it's better to store a fixed value such as -date of birth. Then, whenever you need age, you can calculate it as the -difference between the current date and the birth date. MySQL -provides functions for doing date arithmetic, so this is not difficult. -Storing birth date rather than age has other advantages, too: - -@itemize @bullet -@item -You can use the database for tasks such as generating reminders for upcoming -pet birthdays. (If you think this type of query is somewhat silly, note that -it is the same question you might ask in the context of a business database -to identify clients to whom you'll soon need to send out birthday greetings, -for that computer-assisted personal touch.) - -@item -You can calculate age in relation to dates other than the current date. For -example, if you store death date in the database, you can easily calculate -how old a pet was when it died. -@end itemize - -You can probably think of other types of information that would be useful in -the @code{pet} table, but the ones identified so far are sufficient for now: -name, owner, species, sex, birth, and death. - -Use a @code{CREATE TABLE} statement to specify the layout of your table: - -@example -mysql> CREATE TABLE pet (name VARCHAR(20), owner VARCHAR(20), - -> species VARCHAR(20), sex CHAR(1), birth DATE, death DATE); -@end example - -@code{VARCHAR} is a good choice for the @code{name}, @code{owner}, and -@code{species} columns because the column values will vary in length. The -lengths of those columns need not all be the same, and need not be -@code{20}. You can pick any length from @code{1} to @code{255}, whatever -seems most reasonable to you. (If you make a poor choice and it turns -out later that you need a longer field, MySQL provides an -@code{ALTER TABLE} statement.) - -Animal sex can be represented in a variety of ways, for example, @code{"m"} -and @code{"f"}, or perhaps @code{"male"} and @code{"female"}. It's simplest -to use the single characters @code{"m"} and @code{"f"}. - -The use of the @code{DATE} data type for the @code{birth} and @code{death} -columns is a fairly obvious choice. - -Now that you have created a table, @code{SHOW TABLES} should produce some -output: - -@example -mysql> SHOW TABLES; -+---------------------+ -| Tables in menagerie | -+---------------------+ -| pet | -+---------------------+ -@end example - -To verify that your table was created the way you expected, use -a @code{DESCRIBE} statement: - -@example -mysql> DESCRIBE pet; -+---------+-------------+------+-----+---------+-------+ -| Field | Type | Null | Key | Default | Extra | -+---------+-------------+------+-----+---------+-------+ -| name | varchar(20) | YES | | NULL | | -| owner | varchar(20) | YES | | NULL | | -| species | varchar(20) | YES | | NULL | | -| sex | char(1) | YES | | NULL | | -| birth | date | YES | | NULL | | -| death | date | YES | | NULL | | -+---------+-------------+------+-----+---------+-------+ -@end example - -You can use @code{DESCRIBE} any time, for example, if you forget the names of -the columns in your table or what types they are. - - -@node Loading tables, Retrieving data, Creating tables, Database use -@subsection Loading Data into a Table - -@cindex loading, tables -@cindex tables, loading data -@cindex data, loading into tables - -After creating your table, you need to populate it. The @code{LOAD DATA} and -@code{INSERT} statements are useful for this. - -Suppose your pet records can be described as shown here. -(Observe that MySQL expects dates in @code{YYYY-MM-DD} format; -this may be different from what you are used to.) - -@multitable @columnfractions .10 .10 .10 .05 .15 .15 -@item @strong{name} @tab @strong{owner} @tab @strong{species} @tab @strong{sex} @tab @strong{birth} @tab @strong{death} -@item Fluffy @tab Harold @tab cat @tab f @tab 1993-02-04 @tab -@item Claws @tab Gwen @tab cat @tab m @tab 1994-03-17 @tab -@item Buffy @tab Harold @tab dog @tab f @tab 1989-05-13 @tab -@item Fang @tab Benny @tab dog @tab m @tab 1990-08-27 @tab -@item Bowser @tab Diane @tab dog @tab m @tab 1998-08-31 @tab 1995-07-29 -@item Chirpy @tab Gwen @tab bird @tab f @tab 1998-09-11 @tab -@item Whistler @tab Gwen @tab bird @tab @tab 1997-12-09 @tab -@item Slim @tab Benny @tab snake @tab m @tab 1996-04-29 @tab -@end multitable - -Because you are beginning with an empty table, an easy way to populate it is to -create a text file containing a row for each of your animals, then load the -contents of the file into the table with a single statement. - -You could create a text file @file{pet.txt} containing one record per line, -with values separated by tabs, and given in the order in which the columns -were listed in the @code{CREATE TABLE} statement. For missing values (such -as unknown sexes or death dates for animals that are still living), you can -use @code{NULL} values. To represent these in your text file, use -@code{\N}. For example, the record for Whistler the bird would look like -this (where the whitespace between values is a single tab character): - -@multitable @columnfractions .10 .10 .10 .05 .15 .15 -@item @strong{name} @tab @strong{owner} @tab @strong{species} @tab @strong{sex} @tab @strong{birth} @tab @strong{death} -@item @code{Whistler} @tab @code{Gwen} @tab @code{bird} @tab @code{\N} @tab @code{1997-12-09} @tab @code{\N} -@end multitable - -To load the text file @file{pet.txt} into the @code{pet} table, use this -command: - -@example -mysql> LOAD DATA LOCAL INFILE "pet.txt" INTO TABLE pet; -@end example - -You can specify the column value separator and end of line marker explicitly -in the @code{LOAD DATA} statement if you wish, but the defaults are tab and -linefeed. These are sufficient for the statement to read the file -@file{pet.txt} properly. - -When you want to add new records one at a time, the @code{INSERT} statement -is useful. In its simplest form, you supply values for each column, in the -order in which the columns were listed in the @code{CREATE TABLE} statement. -Suppose Diane gets a new hamster named Puffball. You could add a new record -using an @code{INSERT} statement like this: - -@example -mysql> INSERT INTO pet - -> VALUES ('Puffball','Diane','hamster','f','1999-03-30',NULL); -@end example - -Note that string and date values are specified as quoted strings here. Also, -with @code{INSERT}, you can insert @code{NULL} directly to represent a -missing value. You do not use @code{\N} like you do with @code{LOAD DATA}. - -From this example, you should be able to see that there would be a lot more -typing involved to load -your records initially using several @code{INSERT} statements rather -than a single @code{LOAD DATA} statement. - - -@node Retrieving data, , Loading tables, Database use -@subsection Retrieving Information from a Table - -@cindex data, retrieving -@cindex tables, retrieving data -@cindex retrieving, data from tables -@cindex unloading, tables - -@menu -* Selecting all:: Selecting all data -* Selecting rows:: Selecting particular rows -* Selecting columns:: Selecting particular columns -* Sorting rows:: Sorting rows -* Date calculations:: Date calculations -* Working with NULL:: Working with @code{NULL} values -* Pattern matching:: Pattern matching -* Counting rows:: Counting rows -* Multiple tables:: Using More Than one Table -@end menu - -The @code{SELECT} statement is used to pull information from a table. -The general form of the statement is: - -@example -SELECT what_to_select -FROM which_table -WHERE conditions_to_satisfy -@end example - -@code{what_to_select} indicates what you want to see. This can be a list of -columns, or @code{*} to indicate ``all columns.'' @code{which_table} -indicates the table from which you want to retrieve data. The @code{WHERE} -clause is optional. If it's present, @code{conditions_to_satisfy} specifies -conditions that rows must satisfy to qualify for retrieval. - - -@node Selecting all, Selecting rows, Retrieving data, Retrieving data -@subsubsection Selecting All Data - -The simplest form of @code{SELECT} retrieves everything from a table: - -@example -mysql> SELECT * FROM pet; -+----------+--------+---------+------+------------+------------+ -| name | owner | species | sex | birth | death | -+----------+--------+---------+------+------------+------------+ -| Fluffy | Harold | cat | f | 1993-02-04 | NULL | -| Claws | Gwen | cat | m | 1994-03-17 | NULL | -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -| Fang | Benny | dog | m | 1990-08-27 | NULL | -| Bowser | Diane | dog | m | 1998-08-31 | 1995-07-29 | -| Chirpy | Gwen | bird | f | 1998-09-11 | NULL | -| Whistler | Gwen | bird | NULL | 1997-12-09 | NULL | -| Slim | Benny | snake | m | 1996-04-29 | NULL | -| Puffball | Diane | hamster | f | 1999-03-30 | NULL | -+----------+--------+---------+------+------------+------------+ -@end example - -This form of @code{SELECT} is useful if you want to review your entire table, -for instance, after you've just loaded it with your initial dataset. As it -happens, the output just shown reveals an error in your datafile: Bowser -appears to have been born after he died! Consulting your original pedigree -papers, you find that the correct birth year is 1989, not 1998. - -There are are least a couple of ways to fix this: - -@itemize @bullet -@item -Edit the file @file{pet.txt} to correct the error, then empty the table -and reload it using @code{DELETE} and @code{LOAD DATA}: - -@example -mysql> SET AUTOCOMMIT=1; # Used for quick re-create of the table -mysql> DELETE FROM pet; -mysql> LOAD DATA LOCAL INFILE "pet.txt" INTO TABLE pet; -@end example - -However, if you do this, you must also re-enter the record for Puffball. - -@item -Fix only the erroneous record with an @code{UPDATE} statement: - -@example -mysql> UPDATE pet SET birth = "1989-08-31" WHERE name = "Bowser"; -@end example -@end itemize - -As shown above, it is easy to retrieve an entire table. But typically you -don't want to do that, particularly when the table becomes large. Instead, -you're usually more interested in answering a particular question, in which -case you specify some constraints on the information you want. Let's look at -some selection queries in terms of questions about your pets that they -answer. - - -@node Selecting rows, Selecting columns, Selecting all, Retrieving data -@subsubsection Selecting Particular Rows - -@cindex rows, selecting -@cindex tables, selecting rows - -You can select only particular rows from your table. For example, if you want -to verify the change that you made to Bowser's birth date, select Bowser's -record like this: - -@example -mysql> SELECT * FROM pet WHERE name = "Bowser"; -+--------+-------+---------+------+------------+------------+ -| name | owner | species | sex | birth | death | -+--------+-------+---------+------+------------+------------+ -| Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 | -+--------+-------+---------+------+------------+------------+ -@end example - -The output confirms that the year is correctly recorded now as 1989, not 1998. - -String comparisons are normally case-insensitive, so you can specify the -name as @code{"bowser"}, @code{"BOWSER"}, etc. The query result will be -the same. - -You can specify conditions on any column, not just @code{name}. For example, -if you want to know which animals were born after 1998, test the @code{birth} -column: - -@example -mysql> SELECT * FROM pet WHERE birth >= "1998-1-1"; -+----------+-------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+----------+-------+---------+------+------------+-------+ -| Chirpy | Gwen | bird | f | 1998-09-11 | NULL | -| Puffball | Diane | hamster | f | 1999-03-30 | NULL | -+----------+-------+---------+------+------------+-------+ -@end example - -You can combine conditions, for example, to locate female dogs: - -@example -mysql> SELECT * FROM pet WHERE species = "dog" AND sex = "f"; -+-------+--------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+-------+--------+---------+------+------------+-------+ -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -+-------+--------+---------+------+------------+-------+ -@end example - -The preceding query uses the @code{AND} logical operator. There is also an -@code{OR} operator: - -@example -mysql> SELECT * FROM pet WHERE species = "snake" OR species = "bird"; -+----------+-------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+----------+-------+---------+------+------------+-------+ -| Chirpy | Gwen | bird | f | 1998-09-11 | NULL | -| Whistler | Gwen | bird | NULL | 1997-12-09 | NULL | -| Slim | Benny | snake | m | 1996-04-29 | NULL | -+----------+-------+---------+------+------------+-------+ -@end example - -@code{AND} and @code{OR} may be intermixed. If you do that, it's a good idea -to use parentheses to indicate how conditions should be grouped: - -@example -mysql> SELECT * FROM pet WHERE (species = "cat" AND sex = "m") - -> OR (species = "dog" AND sex = "f"); -+-------+--------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+-------+--------+---------+------+------------+-------+ -| Claws | Gwen | cat | m | 1994-03-17 | NULL | -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -+-------+--------+---------+------+------------+-------+ -@end example - - -@node Selecting columns, Sorting rows, Selecting rows, Retrieving data -@subsubsection Selecting Particular Columns - -@cindex columns, selecting -@cindex tables, selecting columns - -If you don't want to see entire rows from your table, just name the columns -in which you're interested, separated by commas. For example, if you want to -know when your animals were born, select the @code{name} and @code{birth} -columns: - -@example -mysql> SELECT name, birth FROM pet; -+----------+------------+ -| name | birth | -+----------+------------+ -| Fluffy | 1993-02-04 | -| Claws | 1994-03-17 | -| Buffy | 1989-05-13 | -| Fang | 1990-08-27 | -| Bowser | 1989-08-31 | -| Chirpy | 1998-09-11 | -| Whistler | 1997-12-09 | -| Slim | 1996-04-29 | -| Puffball | 1999-03-30 | -+----------+------------+ -@end example - -To find out who owns pets, use this query: - -@example -mysql> SELECT owner FROM pet; -+--------+ -| owner | -+--------+ -| Harold | -| Gwen | -| Harold | -| Benny | -| Diane | -| Gwen | -| Gwen | -| Benny | -| Diane | -+--------+ -@end example - -@findex DISTINCT -However, notice that the query simply retrieves the @code{owner} field from -each record, and some of them appear more than once. To minimise the output, -retrieve each unique output record just once by adding the keyword -@code{DISTINCT}: - -@example -mysql> SELECT DISTINCT owner FROM pet; -+--------+ -| owner | -+--------+ -| Benny | -| Diane | -| Gwen | -| Harold | -+--------+ -@end example - -You can use a @code{WHERE} clause to combine row selection with column -selection. For example, to get birth dates for dogs and cats only, -use this query: - -@example -mysql> SELECT name, species, birth FROM pet - -> WHERE species = "dog" OR species = "cat"; -+--------+---------+------------+ -| name | species | birth | -+--------+---------+------------+ -| Fluffy | cat | 1993-02-04 | -| Claws | cat | 1994-03-17 | -| Buffy | dog | 1989-05-13 | -| Fang | dog | 1990-08-27 | -| Bowser | dog | 1989-08-31 | -+--------+---------+------------+ -@end example - - -@node Sorting rows, Date calculations, Selecting columns, Retrieving data -@subsubsection Sorting Rows - -@cindex rows, sorting -@cindex sorting, table rows -@cindex sorting, data -@cindex tables, sorting rows - -You may have noticed in the preceding examples that the result rows are -displayed in no particular order. However, it's often easier to examine -query output when the rows are sorted in some meaningful way. To sort a -result, use an @code{ORDER BY} clause. - -Here are animal birthdays, sorted by date: - -@example -mysql> SELECT name, birth FROM pet ORDER BY birth; -+----------+------------+ -| name | birth | -+----------+------------+ -| Buffy | 1989-05-13 | -| Bowser | 1989-08-31 | -| Fang | 1990-08-27 | -| Fluffy | 1993-02-04 | -| Claws | 1994-03-17 | -| Slim | 1996-04-29 | -| Whistler | 1997-12-09 | -| Chirpy | 1998-09-11 | -| Puffball | 1999-03-30 | -+----------+------------+ -@end example - -On character type columns, sorting@-like all other comparison -operations@-is normally performed in a case-insensitive fashion. -This means that the order will be undefined for columns that are identical -except for their case. You can force a case-sensitive sort by using the -BINARY cast: @code{ORDER BY BINARY(field)}. - -To sort in reverse order, add the @code{DESC} (descending) keyword to the -name of the column you are sorting by: - -@example -mysql> SELECT name, birth FROM pet ORDER BY birth DESC; -+----------+------------+ -| name | birth | -+----------+------------+ -| Puffball | 1999-03-30 | -| Chirpy | 1998-09-11 | -| Whistler | 1997-12-09 | -| Slim | 1996-04-29 | -| Claws | 1994-03-17 | -| Fluffy | 1993-02-04 | -| Fang | 1990-08-27 | -| Bowser | 1989-08-31 | -| Buffy | 1989-05-13 | -+----------+------------+ -@end example - -You can sort on multiple columns. For example, to sort by type of -animal, then by birth date within animal type with youngest animals first, -use the following query: - -@example -mysql> SELECT name, species, birth FROM pet ORDER BY species, birth DESC; -+----------+---------+------------+ -| name | species | birth | -+----------+---------+------------+ -| Chirpy | bird | 1998-09-11 | -| Whistler | bird | 1997-12-09 | -| Claws | cat | 1994-03-17 | -| Fluffy | cat | 1993-02-04 | -| Fang | dog | 1990-08-27 | -| Bowser | dog | 1989-08-31 | -| Buffy | dog | 1989-05-13 | -| Puffball | hamster | 1999-03-30 | -| Slim | snake | 1996-04-29 | -+----------+---------+------------+ -@end example - -Note that the @code{DESC} keyword applies only to the column name immediately -preceding it (@code{birth}); @code{species} values are still sorted in -ascending order. - - -@node Date calculations, Working with NULL, Sorting rows, Retrieving data -@subsubsection Date Calculations - -@cindex date calculations -@cindex calculating, dates -@cindex extracting, dates -@cindex age, calculating - -MySQL provides several functions that you can use to perform -calculations on dates, for example, to calculate ages or extract -parts of dates. - -To determine how many years old each of your pets is, compute the -difference in the year part of the current date and the birth date, then -subtract one if the current date occurs earlier in the calendar year than -the birth date. The following query shows, for each pet, the birth date, -the current date, and the age in years. - -@example -mysql> SELECT name, birth, CURRENT_DATE, - -> (YEAR(CURRENT_DATE)-YEAR(birth)) - -> - (RIGHT(CURRENT_DATE,5)<RIGHT(birth,5)) - -> AS age - -> FROM pet; -+----------+------------+--------------+------+ -| name | birth | CURRENT_DATE | age | -+----------+------------+--------------+------+ -| Fluffy | 1993-02-04 | 2001-08-29 | 8 | -| Claws | 1994-03-17 | 2001-08-29 | 7 | -| Buffy | 1989-05-13 | 2001-08-29 | 12 | -| Fang | 1990-08-27 | 2001-08-29 | 11 | -| Bowser | 1989-08-31 | 2001-08-29 | 11 | -| Chirpy | 1998-09-11 | 2001-08-29 | 2 | -| Whistler | 1997-12-09 | 2001-08-29 | 3 | -| Slim | 1996-04-29 | 2001-08-29 | 5 | -| Puffball | 1999-03-30 | 2001-08-29 | 2 | -+----------+------------+--------------+------+ -@end example - -Here, @code{YEAR()} pulls out the year part of a date and @code{RIGHT()} -pulls off the rightmost five characters that represent the @code{MM-DD} -(calendar year) part of the date. The part of the expression that -compares the @code{MM-DD} values evaluates to 1 or 0, which adjusts the -year difference down a year if @code{CURRENT_DATE} occurs earlier in -the year than @code{birth}. The full expression is somewhat ungainly, -so an alias (@code{age}) is used to make the output column label more -meaningful. - -The query works, but the result could be scanned more easily if the rows -were presented in some order. This can be done by adding an @code{ORDER -BY name} clause to sort the output by name: - -@example -mysql> SELECT name, birth, CURRENT_DATE, - -> (YEAR(CURRENT_DATE)-YEAR(birth)) - -> - (RIGHT(CURRENT_DATE,5)<RIGHT(birth,5)) - -> AS age - -> FROM pet ORDER BY name; -+----------+------------+--------------+------+ -| name | birth | CURRENT_DATE | age | -+----------+------------+--------------+------+ -| Bowser | 1989-08-31 | 2001-08-29 | 11 | -| Buffy | 1989-05-13 | 2001-08-29 | 12 | -| Chirpy | 1998-09-11 | 2001-08-29 | 2 | -| Claws | 1994-03-17 | 2001-08-29 | 7 | -| Fang | 1990-08-27 | 2001-08-29 | 11 | -| Fluffy | 1993-02-04 | 2001-08-29 | 8 | -| Puffball | 1999-03-30 | 2001-08-29 | 2 | -| Slim | 1996-04-29 | 2001-08-29 | 5 | -| Whistler | 1997-12-09 | 2001-08-29 | 3 | -+----------+------------+--------------+------+ -@end example - -To sort the output by @code{age} rather than @code{name}, just use a -different @code{ORDER BY} clause: - -@example -mysql> SELECT name, birth, CURRENT_DATE, - -> (YEAR(CURRENT_DATE)-YEAR(birth)) - -> - (RIGHT(CURRENT_DATE,5)<RIGHT(birth,5)) - -> AS age - -> FROM pet ORDER BY age; -+----------+------------+--------------+------+ -| name | birth | CURRENT_DATE | age | -+----------+------------+--------------+------+ -| Chirpy | 1998-09-11 | 2001-08-29 | 2 | -| Puffball | 1999-03-30 | 2001-08-29 | 2 | -| Whistler | 1997-12-09 | 2001-08-29 | 3 | -| Slim | 1996-04-29 | 2001-08-29 | 5 | -| Claws | 1994-03-17 | 2001-08-29 | 7 | -| Fluffy | 1993-02-04 | 2001-08-29 | 8 | -| Fang | 1990-08-27 | 2001-08-29 | 11 | -| Bowser | 1989-08-31 | 2001-08-29 | 11 | -| Buffy | 1989-05-13 | 2001-08-29 | 12 | -+----------+------------+--------------+------+ -@end example - -A similar query can be used to determine age at death for animals that have -died. You determine which animals these are by checking whether the -@code{death} value is @code{NULL}. Then, for those with non-@code{NULL} -values, compute the difference between the @code{death} and @code{birth} -values: - -@example -mysql> SELECT name, birth, death, - -> (YEAR(death)-YEAR(birth)) - (RIGHT(death,5)<RIGHT(birth,5)) - -> AS age - -> FROM pet WHERE death IS NOT NULL ORDER BY age; -+--------+------------+------------+------+ -| name | birth | death | age | -+--------+------------+------------+------+ -| Bowser | 1989-08-31 | 1995-07-29 | 5 | -+--------+------------+------------+------+ -@end example - -The query uses @code{death IS NOT NULL} rather than @code{death <> NULL} -because @code{NULL} is a special value. This is explained later. -@xref{Working with NULL, , Working with @code{NULL}}. - -What if you want to know which animals have birthdays next month? For this -type of calculation, year and day are irrelevant; you simply want to extract -the month part of the @code{birth} column. MySQL provides several -date-part extraction functions, such as @code{YEAR()}, @code{MONTH()}, and -@code{DAYOFMONTH()}. @code{MONTH()} is the appropriate function here. To -see how it works, run a simple query that displays the value of both -@code{birth} and @code{MONTH(birth)}: - -@example -mysql> SELECT name, birth, MONTH(birth) FROM pet; -+----------+------------+--------------+ -| name | birth | MONTH(birth) | -+----------+------------+--------------+ -| Fluffy | 1993-02-04 | 2 | -| Claws | 1994-03-17 | 3 | -| Buffy | 1989-05-13 | 5 | -| Fang | 1990-08-27 | 8 | -| Bowser | 1989-08-31 | 8 | -| Chirpy | 1998-09-11 | 9 | -| Whistler | 1997-12-09 | 12 | -| Slim | 1996-04-29 | 4 | -| Puffball | 1999-03-30 | 3 | -+----------+------------+--------------+ -@end example - -Finding animals with birthdays in the upcoming month is easy, too. Suppose -the current month is April. Then the month value is @code{4} and you look -for animals born in May (month 5) like this: - -@example -mysql> SELECT name, birth FROM pet WHERE MONTH(birth) = 5; -+-------+------------+ -| name | birth | -+-------+------------+ -| Buffy | 1989-05-13 | -+-------+------------+ -@end example - -There is a small complication if the current month is December, of course. -You don't just add one to the month number (@code{12}) and look for animals -born in month 13, because there is no such month. Instead, you look for -animals born in January (month 1). - -You can even write the query so that it works no matter what the current -month is. That way you don't have to use a particular month number -in the query. @code{DATE_ADD()} allows you to add a time interval to a -given date. If you add a month to the value of @code{NOW()}, then extract -the month part with @code{MONTH()}, the result produces the month in which to -look for birthdays: - -@example -mysql> SELECT name, birth FROM pet - -> WHERE MONTH(birth) = MONTH(DATE_ADD(NOW(), INTERVAL 1 MONTH)); -@end example - -A different way to accomplish the same task is to add @code{1} to get the -next month after the current one (after using the modulo function (@code{MOD}) -to wrap around the month value to @code{0} if it is currently -@code{12}): - -@example -mysql> SELECT name, birth FROM pet - -> WHERE MONTH(birth) = MOD(MONTH(NOW()), 12) + 1; -@end example - -Note that @code{MONTH} returns a number between 1 and 12. And -@code{MOD(something,12)} returns a number between 0 and 11. So the -addition has to be after the @code{MOD()}, otherwise we would go from -November (11) to January (1). - - -@node Working with NULL, Pattern matching, Date calculations, Retrieving data -@subsubsection Working with @code{NULL} Values - -@findex NULL -@cindex NULL value - -The @code{NULL} value can be surprising until you get used to it. -Conceptually, @code{NULL} means missing value or unknown value and it -is treated somewhat differently than other values. To test for @code{NULL}, -you cannot use the arithmetic comparison operators such as @code{=}, @code{<}, -or @code{<>}. To demonstrate this for yourself, try the following query: - -@example -mysql> SELECT 1 = NULL, 1 <> NULL, 1 < NULL, 1 > NULL; -+----------+-----------+----------+----------+ -| 1 = NULL | 1 <> NULL | 1 < NULL | 1 > NULL | -+----------+-----------+----------+----------+ -| NULL | NULL | NULL | NULL | -+----------+-----------+----------+----------+ -@end example - -Clearly you get no meaningful results from these comparisons. Use -the @code{IS NULL} and @code{IS NOT NULL} operators instead: - -@example -mysql> SELECT 1 IS NULL, 1 IS NOT NULL; -+-----------+---------------+ -| 1 IS NULL | 1 IS NOT NULL | -+-----------+---------------+ -| 0 | 1 | -+-----------+---------------+ -@end example - -Note that two @code{NULL} are compared as equal is when you do an -@code{GROUP BY}. - -In MySQL, 0 or @code{NULL} means false and anything else means true. -The default truth value from a boolean operation is 1. - -When doing an @code{ORDER BY}, @code{NULL} values are always sorted first, -even if you are using @code{DESC}. - -This special treatment of @code{NULL} is why, in the previous section, it -was necessary to determine which animals are no longer alive using -@code{death IS NOT NULL} instead of @code{death <> NULL}. - - -@node Pattern matching, Counting rows, Working with NULL, Retrieving data -@subsubsection Pattern Matching - -@cindex pattern matching -@cindex matching, patterns -@cindex expressions, extended - -MySQL provides standard SQL pattern matching as well as a form of -pattern matching based on extended regular expressions similar to those used -by Unix utilities such as @code{vi}, @code{grep}, and @code{sed}. - -SQL pattern matching allows you to use @samp{_} to match any single -character and @samp{%} to match an arbitrary number of characters (including -zero characters). In MySQL, SQL patterns are case-insensitive by -default. Some examples are shown here. Note that you do not use @code{=} -or @code{<>} when you use SQL patterns; use the @code{LIKE} or @code{NOT -LIKE} comparison operators instead. - -To find names beginning with @samp{b}: - -@example -mysql> SELECT * FROM pet WHERE name LIKE "b%"; -+--------+--------+---------+------+------------+------------+ -| name | owner | species | sex | birth | death | -+--------+--------+---------+------+------------+------------+ -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -| Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 | -+--------+--------+---------+------+------------+------------+ -@end example - -To find names ending with @samp{fy}: - -@example -mysql> SELECT * FROM pet WHERE name LIKE "%fy"; -+--------+--------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+--------+--------+---------+------+------------+-------+ -| Fluffy | Harold | cat | f | 1993-02-04 | NULL | -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -+--------+--------+---------+------+------------+-------+ -@end example - -To find names containing a @samp{w}: - -@example -mysql> SELECT * FROM pet WHERE name LIKE "%w%"; -+----------+-------+---------+------+------------+------------+ -| name | owner | species | sex | birth | death | -+----------+-------+---------+------+------------+------------+ -| Claws | Gwen | cat | m | 1994-03-17 | NULL | -| Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 | -| Whistler | Gwen | bird | NULL | 1997-12-09 | NULL | -+----------+-------+---------+------+------------+------------+ -@end example - -To find names containing exactly five characters, use the @samp{_} pattern -character: - -@example -mysql> SELECT * FROM pet WHERE name LIKE "_____"; -+-------+--------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+-------+--------+---------+------+------------+-------+ -| Claws | Gwen | cat | m | 1994-03-17 | NULL | -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -+-------+--------+---------+------+------------+-------+ -@end example - -The other type of pattern matching provided by MySQL uses extended -regular expressions. When you test for a match for this type of pattern, use -the @code{REGEXP} and @code{NOT REGEXP} operators (or @code{RLIKE} and -@code{NOT RLIKE}, which are synonyms). - -Some characteristics of extended regular expressions are: - -@itemize @bullet -@item -@samp{.} matches any single character. - -@item -A character class @samp{[...]} matches any character within the brackets. -For example, @samp{[abc]} matches @samp{a}, @samp{b}, or @samp{c}. To name a -range of characters, use a dash. @samp{[a-z]} matches any lowercase letter, -whereas @samp{[0-9]} matches any digit. - -@item -@samp{*} matches zero or more instances of the thing preceding it. For -example, @samp{x*} matches any number of @samp{x} characters, -@samp{[0-9]*} matches any number of digits, and @samp{.*} matches any -number of anything. - -@item -The pattern matches if it occurs anywhere in the value being tested. -(SQL patterns match only if they match the entire value.) - -@item -To anchor a pattern so that it must match the beginning or end of the value -being tested, use @samp{^} at the beginning or @samp{$} at the end of the -pattern. -@end itemize - -To demonstrate how extended regular expressions work, the @code{LIKE} queries -shown previously are rewritten here to use @code{REGEXP}. - -To find names beginning with @samp{b}, use @samp{^} to match the beginning of -the name: - -@example -mysql> SELECT * FROM pet WHERE name REGEXP "^b"; -+--------+--------+---------+------+------------+------------+ -| name | owner | species | sex | birth | death | -+--------+--------+---------+------+------------+------------+ -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -| Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 | -+--------+--------+---------+------+------------+------------+ -@end example - -Prior to MySQL Version 3.23.4, @code{REGEXP} is case-sensitive, -and the previous query will return no rows. To match either lowercase or -uppercase @samp{b}, use this query instead: - -@example -mysql> SELECT * FROM pet WHERE name REGEXP "^[bB]"; -@end example - -From MySQL 3.23.4 on, to force a @code{REGEXP} comparison to -be case-sensitive, use the @code{BINARY} keyword to make one of the -strings a binary string. This query will match only lowercase @samp{b} -at the beginning of a name: - -@example -mysql> SELECT * FROM pet WHERE name REGEXP BINARY "^b"; -@end example - -To find names ending with @samp{fy}, use @samp{$} to match the end of the -name: - -@example -mysql> SELECT * FROM pet WHERE name REGEXP "fy$"; -+--------+--------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+--------+--------+---------+------+------------+-------+ -| Fluffy | Harold | cat | f | 1993-02-04 | NULL | -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -+--------+--------+---------+------+------------+-------+ -@end example - -To find names containing a lowercase or uppercase @samp{w}, use this query: - -@example -mysql> SELECT * FROM pet WHERE name REGEXP "w"; -+----------+-------+---------+------+------------+------------+ -| name | owner | species | sex | birth | death | -+----------+-------+---------+------+------------+------------+ -| Claws | Gwen | cat | m | 1994-03-17 | NULL | -| Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 | -| Whistler | Gwen | bird | NULL | 1997-12-09 | NULL | -+----------+-------+---------+------+------------+------------+ -@end example - -Because a regular expression pattern matches if it occurs anywhere in the -value, it is not necessary in the previous query to put a wildcard on either -side of the pattern to get it to match the entire value like it would be if -you used a SQL pattern. - -To find names containing exactly five characters, use @samp{^} and @samp{$} -to match the beginning and end of the name, and five instances of @samp{.} -in between: - -@example -mysql> SELECT * FROM pet WHERE name REGEXP "^.....$"; -+-------+--------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+-------+--------+---------+------+------------+-------+ -| Claws | Gwen | cat | m | 1994-03-17 | NULL | -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -+-------+--------+---------+------+------------+-------+ -@end example - -You could also write the previous query using the @samp{@{n@}} -``repeat-@code{n}-times'' operator: - -@example -mysql> SELECT * FROM pet WHERE name REGEXP "^.@{5@}$"; -+-------+--------+---------+------+------------+-------+ -| name | owner | species | sex | birth | death | -+-------+--------+---------+------+------------+-------+ -| Claws | Gwen | cat | m | 1994-03-17 | NULL | -| Buffy | Harold | dog | f | 1989-05-13 | NULL | -+-------+--------+---------+------+------------+-------+ -@end example - - -@node Counting rows, Multiple tables, Pattern matching, Retrieving data -@subsubsection Counting Rows - -@cindex rows, counting -@cindex tables, counting rows -@cindex counting, table rows - -Databases are often used to answer the question, ``How often does a certain -type of data occur in a table?'' For example, you might want to know how -many pets you have, or how many pets each owner has, or you might want to -perform various kinds of censuses on your animals. - -Counting the total number of animals you have is the same question as ``How -many rows are in the @code{pet} table?'' because there is one record per pet. -The @code{COUNT()} function counts the number of non-@code{NULL} results, so -the query to count your animals looks like this: - -@example -mysql> SELECT COUNT(*) FROM pet; -+----------+ -| COUNT(*) | -+----------+ -| 9 | -+----------+ -@end example - -Earlier, you retrieved the names of the people who owned pets. You can -use @code{COUNT()} if you want to find out how many pets each owner has: - -@example -mysql> SELECT owner, COUNT(*) FROM pet GROUP BY owner; -+--------+----------+ -| owner | COUNT(*) | -+--------+----------+ -| Benny | 2 | -| Diane | 2 | -| Gwen | 3 | -| Harold | 2 | -+--------+----------+ -@end example - -Note the use of @code{GROUP BY} to group together all records for each -@code{owner}. Without it, all you get is an error message: - -@example -mysql> SELECT owner, COUNT(owner) FROM pet; -ERROR 1140 at line 1: Mixing of GROUP columns (MIN(),MAX(),COUNT()...) -with no GROUP columns is illegal if there is no GROUP BY clause -@end example - -@code{COUNT()} and @code{GROUP BY} are useful for characterising your -data in various ways. The following examples show different ways to -perform animal census operations. - -Number of animals per species: - -@example -mysql> SELECT species, COUNT(*) FROM pet GROUP BY species; -+---------+----------+ -| species | COUNT(*) | -+---------+----------+ -| bird | 2 | -| cat | 2 | -| dog | 3 | -| hamster | 1 | -| snake | 1 | -+---------+----------+ -@end example - -Number of animals per sex: - -@example -mysql> SELECT sex, COUNT(*) FROM pet GROUP BY sex; -+------+----------+ -| sex | COUNT(*) | -+------+----------+ -| NULL | 1 | -| f | 4 | -| m | 4 | -+------+----------+ -@end example - -(In this output, @code{NULL} indicates sex unknown.) - -Number of animals per combination of species and sex: - -@example -mysql> SELECT species, sex, COUNT(*) FROM pet GROUP BY species, sex; -+---------+------+----------+ -| species | sex | COUNT(*) | -+---------+------+----------+ -| bird | NULL | 1 | -| bird | f | 1 | -| cat | f | 1 | -| cat | m | 1 | -| dog | f | 1 | -| dog | m | 2 | -| hamster | f | 1 | -| snake | m | 1 | -+---------+------+----------+ -@end example - -You need not retrieve an entire table when you use @code{COUNT()}. For -example, the previous query, when performed just on dogs and cats, looks like -this: - -@example -mysql> SELECT species, sex, COUNT(*) FROM pet - -> WHERE species = "dog" OR species = "cat" - -> GROUP BY species, sex; -+---------+------+----------+ -| species | sex | COUNT(*) | -+---------+------+----------+ -| cat | f | 1 | -| cat | m | 1 | -| dog | f | 1 | -| dog | m | 2 | -+---------+------+----------+ -@end example - -Or, if you wanted the number of animals per sex only for known-sex animals: - -@example -mysql> SELECT species, sex, COUNT(*) FROM pet - -> WHERE sex IS NOT NULL - -> GROUP BY species, sex; -+---------+------+----------+ -| species | sex | COUNT(*) | -+---------+------+----------+ -| bird | f | 1 | -| cat | f | 1 | -| cat | m | 1 | -| dog | f | 1 | -| dog | m | 2 | -| hamster | f | 1 | -| snake | m | 1 | -+---------+------+----------+ -@end example - - -@node Multiple tables, , Counting rows, Retrieving data -@subsubsection Using More Than one Table - -@cindex tables, multiple - -The @code{pet} table keeps track of which pets you have. If you want to -record other information about them, such as events in their lives like -visits to the vet or when litters are born, you need another table. What -should this table look like? It needs: - -@itemize @bullet -@item -To contain the pet name so you know which animal each event pertains -to. - -@item -A date so you know when the event occurred. - -@item -A field to describe the event. - -@item -An event type field, if you want to be able to categorise events. -@end itemize - -Given these considerations, the @code{CREATE TABLE} statement for the -@code{event} table might look like this: - -@example -mysql> CREATE TABLE event (name VARCHAR(20), date DATE, - -> type VARCHAR(15), remark VARCHAR(255)); -@end example - -As with the @code{pet} table, it's easiest to load the initial records -by creating a tab-delimited text file containing the information: - -@multitable @columnfractions .10 .15 .10 .35 -@item @strong{name} @tab @strong{date} @tab @strong{type} @tab @strong{remark} -@item Fluffy @tab 1995-05-15 @tab litter @tab 4 kittens, 3 female, 1 male -@item Buffy @tab 1993-06-23 @tab litter @tab 5 puppies, 2 female, 3 male -@item Buffy @tab 1994-06-19 @tab litter @tab 3 puppies, 3 female -@item Chirpy @tab 1999-03-21 @tab vet @tab needed beak straightened -@item Slim @tab 1997-08-03 @tab vet @tab broken rib -@item Bowser @tab 1991-10-12 @tab kennel @tab -@item Fang @tab 1991-10-12 @tab kennel @tab -@item Fang @tab 1998-08-28 @tab birthday @tab Gave him a new chew toy -@item Claws @tab 1998-03-17 @tab birthday @tab Gave him a new flea collar -@item Whistler @tab 1998-12-09 @tab birthday @tab First birthday -@end multitable - -Load the records like this: - -@example -mysql> LOAD DATA LOCAL INFILE "event.txt" INTO TABLE event; -@end example - -Based on what you've learned from the queries you've run on the @code{pet} -table, you should be able to perform retrievals on the records in the -@code{event} table; the principles are the same. But when is the -@code{event} table by itself insufficient to answer questions you might ask? - -Suppose you want to find out the ages of each pet when they had their -litters. The @code{event} table indicates when this occurred, but to -calculate the age of the mother, you need her birth date. Because that is -stored in the @code{pet} table, you need both tables for the query: - -@example -mysql> SELECT pet.name, - -> (TO_DAYS(date) - TO_DAYS(birth))/365 AS age, - -> remark - -> FROM pet, event - -> WHERE pet.name = event.name AND type = "litter"; -+--------+------+-----------------------------+ -| name | age | remark | -+--------+------+-----------------------------+ -| Fluffy | 2.27 | 4 kittens, 3 female, 1 male | -| Buffy | 4.12 | 5 puppies, 2 female, 3 male | -| Buffy | 5.10 | 3 puppies, 3 female | -+--------+------+-----------------------------+ -@end example - -There are several things to note about this query: - -@itemize @bullet -@item -The @code{FROM} clause lists two tables because the query needs to pull -information from both of them. - -@item -When combining (joining) information from multiple tables, you need to -specify how records in one table can be matched to records in the other. -This is easy because they both have a @code{name} column. The query uses -@code{WHERE} clause to match up records in the two tables based on the -@code{name} values. - -@item -Because the @code{name} column occurs in both tables, you must be specific -about which table you mean when referring to the column. This is done -by prepending the table name to the column name. -@end itemize - -You need not have two different tables to perform a join. Sometimes it is -useful to join a table to itself, if you want to compare records in a table -to other records in that same table. For example, to find breeding pairs -among your pets, you can join the @code{pet} table with itself to pair up -males and females of like species: - -@example -mysql> SELECT p1.name, p1.sex, p2.name, p2.sex, p1.species - -> FROM pet AS p1, pet AS p2 - -> WHERE p1.species = p2.species AND p1.sex = "f" AND p2.sex = "m"; -+--------+------+--------+------+---------+ -| name | sex | name | sex | species | -+--------+------+--------+------+---------+ -| Fluffy | f | Claws | m | cat | -| Buffy | f | Fang | m | dog | -| Buffy | f | Bowser | m | dog | -+--------+------+--------+------+---------+ -@end example - -In this query, we specify aliases for the table name in order -to refer to the columns and keep straight which instance of the table -each column reference is associated with. - - -@node Getting information, Examples, Database use, Tutorial -@section Getting Information About Databases and Tables - -@cindex databases, information about -@cindex tables, information about -@findex DESCRIBE - -What if you forget the name of a database or table, or what the structure of -a given table is (for example, what its columns are called)? MySQL -addresses this problem through several statements that provide information -about the databases and tables it supports. - -You have already seen @code{SHOW DATABASES}, which lists the databases -managed by the server. To find out which database is currently selected, -use the @code{DATABASE()} function: - -@example -mysql> SELECT DATABASE(); -+------------+ -| DATABASE() | -+------------+ -| menagerie | -+------------+ -@end example - -If you haven't selected any database yet, the result is blank. - -To find out what tables the current database contains (for example, when -you're not sure about the name of a table), use this command: - -@example -mysql> SHOW TABLES; -+---------------------+ -| Tables in menagerie | -+---------------------+ -| event | -| pet | -+---------------------+ -@end example - -If you want to find out about the structure of a table, the @code{DESCRIBE} -command is useful; it displays information about each of a table's columns: - -@example -mysql> DESCRIBE pet; -+---------+-------------+------+-----+---------+-------+ -| Field | Type | Null | Key | Default | Extra | -+---------+-------------+------+-----+---------+-------+ -| name | varchar(20) | YES | | NULL | | -| owner | varchar(20) | YES | | NULL | | -| species | varchar(20) | YES | | NULL | | -| sex | char(1) | YES | | NULL | | -| birth | date | YES | | NULL | | -| death | date | YES | | NULL | | -+---------+-------------+------+-----+---------+-------+ -@end example - -@code{Field} indicates the column name, @code{Type} is the data type for -the column, @code{NULL} indicates whether the column can contain -@code{NULL} values, @code{Key} indicates whether the column is -indexed, and @code{Default} specifies the column's default value. - -If you have indexes on a table, -@code{SHOW INDEX FROM tbl_name} produces information about them. - - -@node Examples, Batch mode, Getting information, Tutorial -@section Examples of Common Queries - -@cindex queries, examples -@cindex examples, queries - -Here are examples of how to solve some common problems with -MySQL. - -Some of the examples use the table @code{shop} to hold the price of each -article (item number) for certain traders (dealers). Supposing that each -trader has a single fixed price per article, then (@code{article}, -@code{dealer}) is a primary key for the records. - -Start the command-line tool @code{mysql} and select a database: - -@example -mysql your-database-name -@end example - -(In most MySQL installations, you can use the database-name 'test'). - -You can create the example table as: - -@example -CREATE TABLE shop ( - article INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL, - dealer CHAR(20) DEFAULT '' NOT NULL, - price DOUBLE(16,2) DEFAULT '0.00' NOT NULL, - PRIMARY KEY(article, dealer)); - -INSERT INTO shop VALUES -(1,'A',3.45),(1,'B',3.99),(2,'A',10.99),(3,'B',1.45),(3,'C',1.69), -(3,'D',1.25),(4,'D',19.95); -@end example - -Okay, so the example data is: - -@example -mysql> SELECT * FROM shop; - -+---------+--------+-------+ -| article | dealer | price | -+---------+--------+-------+ -| 0001 | A | 3.45 | -| 0001 | B | 3.99 | -| 0002 | A | 10.99 | -| 0003 | B | 1.45 | -| 0003 | C | 1.69 | -| 0003 | D | 1.25 | -| 0004 | D | 19.95 | -+---------+--------+-------+ -@end example - -@menu -* example-Maximum-column:: The maximum value for a column -* example-Maximum-row:: The row holding the maximum of a certain column -* example-Maximum-column-group:: Maximum of column per group -* example-Maximum-column-group-row:: The rows holding the group-wise maximum of a certain field -* example-user-variables:: Using user variables -* example-Foreign keys:: Using foreign keys -* Searching on two keys:: Searching on Two Keys -* Calculating days:: Calculating Visits Per Day -* example-AUTO_INCREMENT:: Using @code{AUTO_INCREMENT} -@end menu - - -@node example-Maximum-column, example-Maximum-row, Examples, Examples -@subsection The Maximum Value for a Column - -``What's the highest item number?'' - -@example -SELECT MAX(article) AS article FROM shop - -+---------+ -| article | -+---------+ -| 4 | -+---------+ -@end example - - -@node example-Maximum-row, example-Maximum-column-group, example-Maximum-column, Examples -@subsection The Row Holding the Maximum of a Certain Column - -``Find number, dealer, and price of the most expensive article.'' - -In ANSI SQL this is easily done with a subquery: - -@example -SELECT article, dealer, price -FROM shop -WHERE price=(SELECT MAX(price) FROM shop) -@end example - -In MySQL (which does not yet have subselects), just do it in -two steps: - -@enumerate -@item -Get the maximum price value from the table with a @code{SELECT} statement. -@item -Using this value compile the actual query: -@example -SELECT article, dealer, price -FROM shop -WHERE price=19.95 -@end example -@end enumerate - -Another solution is to sort all rows descending by price and only -get the first row using the MySQL-specific @code{LIMIT} clause: - -@example -SELECT article, dealer, price -FROM shop -ORDER BY price DESC -LIMIT 1 -@end example - -@strong{NOTE}: If there are several most expensive articles (for example, each 19.95) -the @code{LIMIT} solution shows only one of them! - - -@node example-Maximum-column-group, example-Maximum-column-group-row, example-Maximum-row, Examples -@subsection Maximum of Column per Group - -``What's the highest price per article?'' - -@example -SELECT article, MAX(price) AS price -FROM shop -GROUP BY article - -+---------+-------+ -| article | price | -+---------+-------+ -| 0001 | 3.99 | -| 0002 | 10.99 | -| 0003 | 1.69 | -| 0004 | 19.95 | -+---------+-------+ -@end example - - -@node example-Maximum-column-group-row, example-user-variables, example-Maximum-column-group, Examples -@subsection The Rows Holding the Group-wise Maximum of a Certain Field - -``For each article, find the dealer(s) with the most expensive price.'' - -In ANSI SQL, I'd do it with a subquery like this: - -@example -SELECT article, dealer, price -FROM shop s1 -WHERE price=(SELECT MAX(s2.price) - FROM shop s2 - WHERE s1.article = s2.article); -@end example - -In MySQL it's best do it in several steps: - -@enumerate -@item -Get the list of (article,maxprice). -@item -For each article get the corresponding rows that have the stored maximum -price. -@end enumerate - -This can easily be done with a temporary table: - -@example -CREATE TEMPORARY TABLE tmp ( - article INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL, - price DOUBLE(16,2) DEFAULT '0.00' NOT NULL); - -LOCK TABLES shop read; - -INSERT INTO tmp SELECT article, MAX(price) FROM shop GROUP BY article; - -SELECT shop.article, dealer, shop.price FROM shop, tmp -WHERE shop.article=tmp.article AND shop.price=tmp.price; - -UNLOCK TABLES; - -DROP TABLE tmp; -@end example - -If you don't use a @code{TEMPORARY} table, you must also lock the 'tmp' table. - -``Can it be done with a single query?'' - -Yes, but only by using a quite inefficient trick that I call the -``MAX-CONCAT trick'': - -@example -SELECT article, - SUBSTRING( MAX( CONCAT(LPAD(price,6,'0'),dealer) ), 7) AS dealer, - 0.00+LEFT( MAX( CONCAT(LPAD(price,6,'0'),dealer) ), 6) AS price -FROM shop -GROUP BY article; - -+---------+--------+-------+ -| article | dealer | price | -+---------+--------+-------+ -| 0001 | B | 3.99 | -| 0002 | A | 10.99 | -| 0003 | C | 1.69 | -| 0004 | D | 19.95 | -+---------+--------+-------+ -@end example - -The last example can, of course, be made a bit more efficient by doing the -splitting of the concatenated column in the client. - - -@node example-user-variables, example-Foreign keys, example-Maximum-column-group-row, Examples -@subsection Using user variables - -You can use MySQL user variables to remember results without -having to store them in temporary variables in the client. -@xref{Variables}. - -For example, to find the articles with the highest and lowest price you -can do: - -@example -mysql> SELECT @@min_price:=MIN(price),@@max_price:=MAX(price) FROM shop; -mysql> SELECT * FROM shop WHERE price=@@min_price OR price=@@max_price; -+---------+--------+-------+ -| article | dealer | price | -+---------+--------+-------+ -| 0003 | D | 1.25 | -| 0004 | D | 19.95 | -+---------+--------+-------+ -@end example - - -@node example-Foreign keys, Searching on two keys, example-user-variables, Examples -@subsection Using Foreign Keys - -@cindex foreign keys -@cindex keys, foreign - -In MySQL 3.23.44 and up, @code{InnoDB} tables supports checking of -foreign key constraints. @xref{InnoDB}. -See also @ref{ANSI diff Foreign Keys}. - -You don't actually need foreign keys to join 2 tables. -The only thing MySQL currently doesn't do (in type types other than -@code{InnoDB}), is @code{CHECK} to make sure that the keys you use -really exist in the table(s) you're referencing and it -doesn't automatically delete rows from a table with a foreign key -definition. If you use your keys like normal, it'll work just fine: - - -@example -CREATE TABLE person ( - id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT, - name CHAR(60) NOT NULL, - PRIMARY KEY (id) -); - -CREATE TABLE shirt ( - id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT, - style ENUM('t-shirt', 'polo', 'dress') NOT NULL, - color ENUM('red', 'blue', 'orange', 'white', 'black') NOT NULL, - owner SMALLINT UNSIGNED NOT NULL REFERENCES person(id), - PRIMARY KEY (id) -); - - -INSERT INTO person VALUES (NULL, 'Antonio Paz'); - -INSERT INTO shirt VALUES -(NULL, 'polo', 'blue', LAST_INSERT_ID()), -(NULL, 'dress', 'white', LAST_INSERT_ID()), -(NULL, 't-shirt', 'blue', LAST_INSERT_ID()); - - -INSERT INTO person VALUES (NULL, 'Lilliana Angelovska'); - -INSERT INTO shirt VALUES -(NULL, 'dress', 'orange', LAST_INSERT_ID()), -(NULL, 'polo', 'red', LAST_INSERT_ID()), -(NULL, 'dress', 'blue', LAST_INSERT_ID()), -(NULL, 't-shirt', 'white', LAST_INSERT_ID()); - - -SELECT * FROM person; -+----+---------------------+ -| id | name | -+----+---------------------+ -| 1 | Antonio Paz | -| 2 | Lilliana Angelovska | -+----+---------------------+ - -SELECT * FROM shirt; -+----+---------+--------+-------+ -| id | style | color | owner | -+----+---------+--------+-------+ -| 1 | polo | blue | 1 | -| 2 | dress | white | 1 | -| 3 | t-shirt | blue | 1 | -| 4 | dress | orange | 2 | -| 5 | polo | red | 2 | -| 6 | dress | blue | 2 | -| 7 | t-shirt | white | 2 | -+----+---------+--------+-------+ - - -SELECT s.* FROM person p, shirt s - WHERE p.name LIKE 'Lilliana%' - AND s.owner = p.id - AND s.color <> 'white'; - -+----+-------+--------+-------+ -| id | style | color | owner | -+----+-------+--------+-------+ -| 4 | dress | orange | 2 | -| 5 | polo | red | 2 | -| 6 | dress | blue | 2 | -+----+-------+--------+-------+ -@end example - - -@node Searching on two keys, Calculating days, example-Foreign keys, Examples -@subsection Searching on Two Keys - -@findex UNION -@cindex searching, two keys -@cindex keys, searching on two - -MySQL doesn't yet optimise when you search on two different -keys combined with @code{OR} (searching on one key with different @code{OR} -parts is optimised quite well): - -@example -SELECT field1_index, field2_index FROM test_table WHERE field1_index = '1' -OR field2_index = '1' -@end example - -The reason is that we haven't yet had time to come up with an efficient -way to handle this in the general case. (The @code{AND} handling is, -in comparison, now completely general and works very well.) - -For the moment you can solve this very efficiently by using a -@code{TEMPORARY} table. This type of optimisation is also very good if -you are using very complicated queries where the SQL server does the -optimisations in the wrong order. - -@example -CREATE TEMPORARY TABLE tmp -SELECT field1_index, field2_index FROM test_table WHERE field1_index = '1'; -INSERT INTO tmp -SELECT field1_index, field2_index FROM test_table WHERE field2_index = '1'; -SELECT * from tmp; -DROP TABLE tmp; -@end example - -The above way to solve this query is in effect a @code{UNION} of two queries. -@xref{UNION}. - -@node Calculating days, example-AUTO_INCREMENT, Searching on two keys, Examples -@subsection Calculating Visits Per Day - -@findex BIT_OR -@findex BIT_COUNT -@findex << -@cindex bit_functions, example - -The following shows an idea of how you can use the bit group functions -to calculate the number of days per month a user has visited a web page. - -@example -CREATE TABLE t1 (year YEAR(4), month INT(2) UNSIGNED ZEROFILL, - day INT(2) UNSIGNED ZEROFILL); -INSERT INTO t1 VALUES(2000,1,1),(2000,1,20),(2000,1,30),(2000,2,2), - (2000,2,23),(2000,2,23); -SELECT year,month,BIT_COUNT(BIT_OR(1<<day)) AS days FROM t1 - GROUP BY year,month; - -Which returns: - -+------+-------+------+ -| year | month | days | -+------+-------+------+ -| 2000 | 01 | 3 | -| 2000 | 02 | 2 | -+------+-------+------+ -@end example - -The above calculates how many different days was used for a given -year/month combination, with automatic removal of duplicate entries. - - -@node example-AUTO_INCREMENT, , Calculating days, Examples -@subsection Using @code{AUTO_INCREMENT} - -@cindex AUTO_INCREMENT -The @code{AUTO_INCREMENT} attribute can be used to generate a unique -identity for new rows: - -@example -CREATE TABLE animals ( - id MEDIUMINT NOT NULL AUTO_INCREMENT, - name CHAR(30) NOT NULL, - PRIMARY KEY (id) - ); -INSERT INTO animals (name) VALUES ("dog"),("cat"),("penguin"), - ("lax"),("whale"); -SELECT * FROM animals; - -Which returns: - -+----+---------+ -| id | name | -+----+---------+ -| 1 | dog | -| 2 | cat | -| 3 | penguin | -| 4 | lax | -| 5 | whale | -+----+---------+ -@end example - -You can retrieve the used @code{AUTO_INCREMENT} key with the -@code{LAST_INSERT_ID()} SQL function or the @code{mysql_insert_id()} API -function. -Note: for a multi-row insert, -@code{LAST_INSERT_ID()}/@code{mysql_insert_id()} will actually return the -@code{AUTO_INCREMENT} key from the @strong{first} inserted row. This allows -multi-row inserts to be reproduced on other servers. - -For MyISAM and BDB tables you can specify @code{AUTO_INCREMENT} on -secondary column in a multi-column key. In this case the generated -value for the autoincrement column is calculated as -@code{MAX(auto_increment_column)+1) WHERE prefix=given-prefix}. This is -useful when you want to put data into ordered groups. - -@example -CREATE TABLE animals ( - grp ENUM('fish','mammal','bird') NOT NULL, - id MEDIUMINT NOT NULL AUTO_INCREMENT, - name CHAR(30) NOT NULL, - PRIMARY KEY (grp,id) - ); -INSERT INTO animals (grp,name) VALUES("mammal","dog"),("mammal","cat"), - ("bird","penguin"),("fish","lax"),("mammal","whale"); -SELECT * FROM animals ORDER BY grp,id; - -Which returns: - -+--------+----+---------+ -| grp | id | name | -+--------+----+---------+ -| fish | 1 | lax | -| mammal | 1 | dog | -| mammal | 2 | cat | -| mammal | 3 | whale | -| bird | 1 | penguin | -+--------+----+---------+ -@end example - -Note that in this case, the @code{AUTO_INCREMENT} value will be reused if you -delete the row with the biggest @code{AUTO_INCREMENT} value in any group. - - -@node Batch mode, Twin, Examples, Tutorial -@section Using @code{mysql} in Batch Mode - -@cindex modes, batch -@cindex batch mode -@cindex running, batch mode -@cindex script files -@cindex files, script - -In the previous sections, you used @code{mysql} interactively to enter -queries and view the results. You can also run @code{mysql} in batch -mode. To do this, put the commands you want to run in a file, then -tell @code{mysql} to read its input from the file: - -@example -shell> mysql < batch-file -@end example - -If you are running @code{mysql} under windows and have some special -characters in the file that causes problems, you can do: - -@example -dos> mysql -e "source batch-file" -@end example - -If you need to specify connection parameters on the command-line, the -command might look like this: - -@example -shell> mysql -h host -u user -p < batch-file -Enter password: ******** -@end example - -When you use @code{mysql} this way, you are creating a script file, then -executing the script. - -If you want the script to continue even if you have errors, you should -use the @code{--force} command-line option. - -Why use a script? Here are a few reasons: - -@itemize @bullet -@item -If you run a query repeatedly (say, every day or every week), making it a -script allows you to avoid retyping it each time you execute it. - -@item -You can generate new queries from existing ones that are similar by copying -and editing script files. - -@item -Batch mode can also be useful while you're developing a query, particularly -for multiple-line commands or multiple-statement sequences of commands. If -you make a mistake, you don't have to retype everything. Just edit your -script to correct the error, then tell @code{mysql} to execute it again. - -@item -If you have a query that produces a lot of output, you can run the output -through a pager rather than watching it scroll off the top of your screen: - -@example -shell> mysql < batch-file | more -@end example - -@item -You can catch the output in a file for further processing: - -@example -shell> mysql < batch-file > mysql.out -@end example - -@item -You can distribute your script to other people so they can run the commands, -too. - -@item -Some situations do not allow for interactive use, for example, when you run -a query from a @code{cron} job. In this case, you must use batch mode. -@end itemize - -The default output format is different (more concise) when you run -@code{mysql} in batch mode than when you use it interactively. For -example, the output of @code{SELECT DISTINCT species FROM pet} looks like -this when run interactively: - -@example -+---------+ -| species | -+---------+ -| bird | -| cat | -| dog | -| hamster | -| snake | -+---------+ -@end example - -But like this when run in batch mode: - -@example -species -bird -cat -dog -hamster -snake -@end example - -If you want to get the interactive output format in batch mode, use -@code{mysql -t}. To echo to the output the commands that are executed, use -@code{mysql -vvv}. - -You can also use scripts in the @code{mysql} command-line prompt by -using the @code{source} command: - -@example -mysql> source filename; -@end example - -@node Twin, Apache, Batch mode, Tutorial -@section Queries from Twin Project - -@cindex Twin Studies, queries -@cindex queries, Twin Studeis project - -At Analytikerna and Lentus, we have been doing the systems and field work -for a big research project. This project is a collaboration between the -Institute of Environmental Medicine at Karolinska Institutet Stockholm -and the Section on Clinical Research in Aging and Psychology at the -University of Southern California. - -The project involves a screening part where all twins in Sweden older -than 65 years are interviewed by telephone. Twins who meet certain -criteria are passed on to the next stage. In this latter stage, twins who -want to participate are visited by a doctor/nurse team. Some of the -examinations include physical and neuropsychological examination, -laboratory testing, neuroimaging, psychological status assessment, and family -history collection. In addition, data are collected on medical and -environmental risk factors. - -More information about Twin studies can be found at: -@uref{http://www.imm.ki.se/TWIN/TWINUKW.HTM} - -The latter part of the project is administered with a web interface -written using Perl and MySQL. - -Each night all data from the interviews are moved into a MySQL -database. - -@menu -* Twin pool:: Find all non-distributed twins -* Twin event:: Show a table on twin pair status -@end menu - - -@node Twin pool, Twin event, Twin, Twin -@subsection Find all Non-distributed Twins - -The following query is used to determine who goes into the second part of the -project: - -@example -SELECT - CONCAT(p1.id, p1.tvab) + 0 AS tvid, - CONCAT(p1.christian_name, " ", p1.surname) AS Name, - p1.postal_code AS Code, - p1.city AS City, - pg.abrev AS Area, - IF(td.participation = "Aborted", "A", " ") AS A, - p1.dead AS dead1, - l.event AS event1, - td.suspect AS tsuspect1, - id.suspect AS isuspect1, - td.severe AS tsevere1, - id.severe AS isevere1, - p2.dead AS dead2, - l2.event AS event2, - h2.nurse AS nurse2, - h2.doctor AS doctor2, - td2.suspect AS tsuspect2, - id2.suspect AS isuspect2, - td2.severe AS tsevere2, - id2.severe AS isevere2, - l.finish_date -FROM - twin_project AS tp - /* For Twin 1 */ - LEFT JOIN twin_data AS td ON tp.id = td.id - AND tp.tvab = td.tvab - LEFT JOIN informant_data AS id ON tp.id = id.id - AND tp.tvab = id.tvab - LEFT JOIN harmony AS h ON tp.id = h.id - AND tp.tvab = h.tvab - LEFT JOIN lentus AS l ON tp.id = l.id - AND tp.tvab = l.tvab - /* For Twin 2 */ - LEFT JOIN twin_data AS td2 ON p2.id = td2.id - AND p2.tvab = td2.tvab - LEFT JOIN informant_data AS id2 ON p2.id = id2.id - AND p2.tvab = id2.tvab - LEFT JOIN harmony AS h2 ON p2.id = h2.id - AND p2.tvab = h2.tvab - LEFT JOIN lentus AS l2 ON p2.id = l2.id - AND p2.tvab = l2.tvab, - person_data AS p1, - person_data AS p2, - postal_groups AS pg -WHERE - /* p1 gets main twin and p2 gets his/her twin. */ - /* ptvab is a field inverted from tvab */ - p1.id = tp.id AND p1.tvab = tp.tvab AND - p2.id = p1.id AND p2.ptvab = p1.tvab AND - /* Just the sceening survey */ - tp.survey_no = 5 AND - /* Skip if partner died before 65 but allow emigration (dead=9) */ - (p2.dead = 0 OR p2.dead = 9 OR - (p2.dead = 1 AND - (p2.death_date = 0 OR - (((TO_DAYS(p2.death_date) - TO_DAYS(p2.birthday)) / 365) - >= 65)))) - AND - ( - /* Twin is suspect */ - (td.future_contact = 'Yes' AND td.suspect = 2) OR - /* Twin is suspect - Informant is Blessed */ - (td.future_contact = 'Yes' AND td.suspect = 1 - AND id.suspect = 1) OR - /* No twin - Informant is Blessed */ - (ISNULL(td.suspect) AND id.suspect = 1 - AND id.future_contact = 'Yes') OR - /* Twin broken off - Informant is Blessed */ - (td.participation = 'Aborted' - AND id.suspect = 1 AND id.future_contact = 'Yes') OR - /* Twin broken off - No inform - Have partner */ - (td.participation = 'Aborted' AND ISNULL(id.suspect) - AND p2.dead = 0)) - AND - l.event = 'Finished' - /* Get at area code */ - AND SUBSTRING(p1.postal_code, 1, 2) = pg.code - /* Not already distributed */ - AND (h.nurse IS NULL OR h.nurse=00 OR h.doctor=00) - /* Has not refused or been aborted */ - AND NOT (h.status = 'Refused' OR h.status = 'Aborted' - OR h.status = 'Died' OR h.status = 'Other') -ORDER BY - tvid; -@end example - -Some explanations: -@table @asis -@item @code{CONCAT(p1.id, p1.tvab) + 0 AS tvid} -We want to sort on the concatenated @code{id} and @code{tvab} in -numerical order. Adding @code{0} to the result causes MySQL to -treat the result as a number. -@item column @code{id} -This identifies a pair of twins. It is a key in all tables. -@item column @code{tvab} -This identifies a twin in a pair. It has a value of @code{1} or @code{2}. -@item column @code{ptvab} -This is an inverse of @code{tvab}. When @code{tvab} is @code{1} this is -@code{2}, and vice versa. It exists to save typing and to make it easier for -MySQL to optimise the query. -@end table - -This query demonstrates, among other things, how to do lookups on a -table from the same table with a join (@code{p1} and @code{p2}). In the example, this -is used to check whether a twin's partner died before the age of 65. If so, -the row is not returned. - -All of the above exist in all tables with twin-related information. We -have a key on both @code{id,tvab} (all tables), and @code{id,ptvab} -(@code{person_data}) to make queries faster. - -On our production machine (A 200MHz UltraSPARC), this query returns -about 150-200 rows and takes less than one second. - -The current number of records in the tables used above: -@multitable @columnfractions .25 .10 -@item @strong{Table} @tab @strong{Rows} -@item @code{person_data} @tab 71074 -@item @code{lentus} @tab 5291 -@item @code{twin_project} @tab 5286 -@item @code{twin_data} @tab 2012 -@item @code{informant_data} @tab 663 -@item @code{harmony} @tab 381 -@item @code{postal_groups} @tab 100 -@end multitable - - -@node Twin event, , Twin pool, Twin -@subsection Show a Table on Twin Pair Status - -Each interview ends with a status code called @code{event}. The query -shown here is used to display a table over all twin pairs combined by -event. This indicates in how many pairs both twins are finished, in how many -pairs one twin is finished and the other refused, and so on. - -@example -SELECT - t1.event, - t2.event, - COUNT(*) -FROM - lentus AS t1, - lentus AS t2, - twin_project AS tp -WHERE - /* We are looking at one pair at a time */ - t1.id = tp.id - AND t1.tvab=tp.tvab - AND t1.id = t2.id - /* Just the sceening survey */ - AND tp.survey_no = 5 - /* This makes each pair only appear once */ - AND t1.tvab='1' AND t2.tvab='2' -GROUP BY - t1.event, t2.event; - -@end example - - -@node Apache, , Twin, Tutorial -@section Using MySQL with Apache - -@cindex Apache - -There are programs that let you authenticate your users from a MySQL -database and also let you log your log files into a MySQL table. -@xref{Portals}. - -You can change the Apache logging format to be easily readable by -MySQL by putting the following into the Apache configuration file: - -@example -LogFormat \ - "\"%h\",%@{%Y%m%d%H%M%S@}t,%>s,\"%b\",\"%@{Content-Type@}o\", \ - \"%U\",\"%@{Referer@}i\",\"%@{User-Agent@}i\"" -@end example - -In MySQL you can do something like this: - -@example -LOAD DATA INFILE '/local/access_log' INTO TABLE table_name -FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' ESCAPED BY '\\' -@end example - - - - -@node MySQL Database Administration, MySQL Optimisation, Tutorial, Top -@chapter Database Administration - -@menu -* Configuring MySQL:: Configuring MySQL -* Privilege system:: General Security Issues and the MySQL Access Privilege System -* User Account Management:: MySQL User Account Management -* Disaster Prevention:: Disaster Prevention and Recovery -* Database Administration:: Database Administration Language Reference -* Localisation:: MySQL Localisation and International Usage -* Server-Side Scripts:: MySQL Server-Side Scripts and Utilities -* Client-Side Scripts:: MySQL Client-Side Scripts and Utilities -* Log Files:: The MySQL Log Files -* Replication:: Replication in MySQL -@end menu - - -@node Configuring MySQL, Privilege system, MySQL Database Administration, MySQL Database Administration -@section Configuring MySQL - -@c FIX: add section intro - - -@menu -* Command-line options:: @code{mysqld} Command-line Options -* Option files:: @file{my.cnf} Option Files -* Installing many servers:: Installing Many Servers on the Same Machine -* Multiple servers:: Running Multiple MySQL Servers on the Same Machine -@end menu - - -@node Command-line options, Option files, Configuring MySQL, Configuring MySQL -@subsection @code{mysqld} Command-line Options - -@findex command-line options -@cindex options, command-line -@cindex mysqld options - -In most cases you should manage mysqld options through option files. -@xref{Option files}. - -@code{mysqld} and @code{mysqld.server} reads options from the -@code{mysqld} and @code{server} groups. @code{mysqld_safe} read options -from the @code{mysqld}, @code{server}, @code{mysqld_safe} and -@code{safe_mysqld} groups. An embedded MySQL server usually reads -options from the @code{server}, @code{embedded} and -@code{xxxxx_SERVER}, where @code{xxxxx} is the name of the application. - - -@code{mysqld} accepts the following command-line options: - -@table @code -@item --ansi -Use ANSI SQL syntax instead of MySQL syntax. @xref{ANSI mode}. - -@item -b, --basedir=path -Path to installation directory. All paths are usually resolved relative to -this. - -@item --big-tables -Allow big result sets by saving all temporary sets on file. It solves -most 'table full' errors, but also slows down the queries where -in-memory tables would suffice. Since Version 3.23.2, MySQL is -able to solve it automatically by using memory for small temporary -tables and switching to disk tables where necessary. - -@item --bind-address=IP -IP address to bind to. - -@item --character-sets-dir=path -Directory where character sets are. @xref{Character sets}. - -@item --chroot=path -Put @code{mysqld} daemon in chroot environment at startup. Recommended -security measure. It somewhat limits @code{LOAD DATA INFILE} and -@code{SELECT ... INTO OUTFILE} though. - -@item --core-file -Write a core file if @code{mysqld} dies. For some systems you must also -specify @code{--core-file-size} to @code{safe_mysqld}. -@xref{safe_mysqld, ,@code{safe_mysqld}}. -Note that on some systems, like Solaris, you will -not get a core file if you are also using the @code{--user} option. - -@item -h, --datadir=path -Path to the database root. - -@item --debug[...]= -If MySQL is configured with @code{--with-debug}, you can use this -option to get a trace file of what @code{mysqld} is doing. -@xref{Making trace files}. - -@item --default-character-set=charset -Set the default character set. @xref{Character sets}. - -@item --default-table-type=type -Set the default table type for tables. @xref{Table types}. - -@item --delay-key-write[= OFF | ON | ALL] -How MyISAM @code{DELAYED KEYS} should be used. @xref{Server parameters}. - -@item --delay-key-write-for-all-tables; In MySQL 4.0.3 you should use --delay-key-write=ALL instead. -Don't flush key buffers between writes for any @code{MyISAM} table. -@xref{Server parameters}. - -@item --des-key-file=filename -Read the default keys used by @code{DES_ENCRYPT()} and @code{DES_DECRYPT()} -from this file. - -@item --enable-external-locking (was --enable-locking) -Enable system locking. Note that if you use this option on a system on -which @code{lockd} does not fully work (as on Linux), you will easily get -mysqld to deadlock. - -@item --enable-named-pipe -Enable support for named pipes (only on NT/Win2000/XP). - -@item -T, --exit-info -This is a bit mask of different flags one can use for debugging the -mysqld server; one should not use this option if one doesn't know -exactly what it does! - -@item --flush -Flush all changes to disk after each SQL command. Normally MySQL -only does a write of all changes to disk after each SQL command and lets -the operating system handle the syncing to disk. -@xref{Crashing}. - -@item -?, --help -Display short help and exit. - -@item --init-file=file -Read SQL commands from this file at startup. - -@item -L, --language=... -Client error messages in given language. May be given as a full path. -@xref{Languages}. - -@item -l, --log[=file] -Log connections and queries to file. @xref{Query log}. - -@item --log-isam[=file] -Log all ISAM/MyISAM changes to file (only used when debugging ISAM/MyISAM). - -@item --log-slow-queries[=file] -Log all queries that have taken more than @code{long_query_time} seconds to -execute to file. @xref{Slow query log}. - -@item --log-update[=file] -Log updates to @code{file.#} where @code{#} is a unique number if not given. -@xref{Update log}. - -@item --log-long-format -Log some extra information to update log. If you are using -@code{--log-slow-queries} then queries that are not using indexes are logged -to the slow query log. - -@item --low-priority-updates -Table-modifying operations (@code{INSERT}/@code{DELETE}/@code{UPDATE}) -will have lower priority than selects. It can also be done via -@code{@{INSERT | REPLACE | UPDATE | DELETE@} LOW_PRIORITY ...} to lower -the priority of only one query, or by -@code{SET LOW_PRIORITY_UPDATES=1} to change the priority in one -thread. @xref{Table locking}. - -@item --memlock -Lock the @code{mysqld} process in memory. This works only if your -system supports the @code{mlockall()} system call (like Solaris). This -may help if you have a problem where the operating system is causing -@code{mysqld} to swap on disk. - -@item --myisam-recover [=option[,option...]]] -Option is any combination -of @code{DEFAULT}, @code{BACKUP}, @code{FORCE} or @code{QUICK}. You can -also set this explicitly to @code{""} if you want to disable this -option. If this option is used, @code{mysqld} will on open check if the -table is marked as crashed or if the table wasn't closed properly. -(The last option only works if you are running with -@code{--skip-external-locking}.) If this is the case @code{mysqld} will run -check on the table. If the table was corrupted, @code{mysqld} will -attempt to repair it. - -The following options affects how the repair works. - -@multitable @columnfractions .15 .7 -@item @strong{Option} @tab @strong{Description} -@item DEFAULT @tab The same as not giving any option to - @code{--myisam-recover}. -@item BACKUP @tab If the data table was changed during recover, save a - backup of the @file{table_name.MYD} datafile as - @file{table_name-datetime.BAK}. -@item FORCE @tab Run recover even if we will lose more than one row - from the .MYD file. -@item QUICK @tab Don't check the rows in the table if there aren't any - delete blocks. -@end multitable - -Before a table is automatically repaired, MySQL will add a note -about this in the error log. If you want to be able to recover from most -things without user intervention, you should use the options -@code{BACKUP,FORCE}. This will force a repair of a table even if some rows -would be deleted, but it will keep the old datafile as a backup so that -you can later examine what happened. - -@item --pid-file=path -Path to pid file used by @code{safe_mysqld}. - -@item -P, --port=... -Port number to listen for TCP/IP connections. - -@item -o, --old-protocol -Use the 3.20 protocol for compatibility with some very old clients. -@xref{Upgrading-from-3.20}. - -@item --one-thread -Only use one thread (for debugging under Linux). @xref{Debugging server}. - -@item -O, --set-variable var=option -Give a variable a value. @code{--help} lists variables. You can find a full -description for all variables in the @code{SHOW VARIABLES} section in this -manual. @xref{SHOW VARIABLES}. The tuning server parameters section includes -information of how to optimize these. Please note that @code{--set-variable} -is deprecated since @strong{MySQL 4.0}, just use @code{--var=option} instead. -@xref{Server parameters}. - -In MySQL 4.0.2 one can set a variable directly with -@code{--variable-name=option} and @code{set-variable} is not anymore needed -in option files. - -If you want to restrict the maximum value a startup option can be set to -with @code{SET}, you can define this by using the -@code{--maximum-variable-name} command line option. @xref{SET OPTION}. - -Note that when setting a variable to a value, MySQL may automatically -correct it to stay within a given range and also adjusts the value a -little to fix for the used algorithm. - -@item --safe-mode -Skip some optimise stages. - -@item --safe-show-database -With this option, the @code{SHOW DATABASES} command returns only those -databases for which the user has some kind of privilege. -From version 4.0.2 this option is deprecated and doesn't do anything -(the option is enabled by default) as we now have the -@code{SHOW DATABASES} privilege. @xref{GRANT}. - -@item --safe-user-create -If this is enabled, a user can't create new users with the GRANT -command, if the user doesn't have @code{INSERT} privilege to the -@code{mysql.user} table or any column in this table. - -@item --skip-bdb -Disable usage of BDB tables. This will save memory and may speed up some -things. - -@item --skip-concurrent-insert -Turn off the ability to select and insert at the same time on @code{MyISAM} -tables. (This is only to be used if you think you have found a bug in this -feature.) - -@item --skip-delay-key-write; In MySQL 4.0.3 you should use --delay-key-write=OFF instead. -Ignore the @code{DELAY_KEY_WRITE} option for all tables. -@xref{Server parameters}. - -@item --skip-grant-tables -This option causes the server not to use the privilege system at all. This -gives everyone @strong{full access} to all databases! (You can tell a running -server to start using the grant tables again by executing @code{mysqladmin -flush-privileges} or @code{mysqladmin reload}.) - -@item --skip-host-cache -Never use host name cache for faster name-ip resolution, but query DNS server -on every connect instead. @xref{DNS}. - -@item --skip-innodb -Disable usage of Innodb tables. This will save memory and disk space and -speed up some things. - -@item --skip-external-locking (was --skip-locking) -Don't use system locking. To use @code{isamchk} or @code{myisamchk} you must -shut down the server. @xref{Stability}. Note that in MySQL Version -3.23 you can use @code{REPAIR} and @code{CHECK} to repair/check @code{MyISAM} -tables. - -@item --skip-name-resolve -Hostnames are not resolved. All @code{Host} column values in the grant tables -must be IP numbers or @code{localhost}. @xref{DNS}. - -@item --skip-networking -Don't listen for TCP/IP connections at all. All interaction with -@code{mysqld} must be made via Unix sockets. This option is highly -recommended for systems where only local requests are allowed. @xref{DNS}. - -@item --skip-new -Don't use new, possible wrong routines. - -@item --skip-symlink -Don't delete or rename files that a symlinked file in the data directory -points to. - -@item --skip-safemalloc -If MySQL is configured with @code{--with-debug=full}, all programs -will check the memory for overruns for every memory allocation and memory -freeing. As this checking is very slow, you can avoid this, when you don't -need memory checking, by using this option. - -@item --skip-show-database -Don't allow @code{SHOW DATABASES} command, unless the user has the -@code{SHOW DATABASES} privilege. From version 4.0.2 you should no longer -need this option, since access can now be granted specifically with the -@code{SHOW DATABASES} privilege. - -@item --skip-stack-trace -Don't write stack traces. This option is useful when you are running -@code{mysqld} under a debugger. On some systems you also have to use -this option to get a core file. @xref{Debugging server}. - -@item --skip-thread-priority -Disable using thread priorities for faster response time. - -@item --socket=path -Socket file to use for local connections instead of default -@code{/tmp/mysql.sock}. - -@item --sql-mode=option[,option[,option...]] -Option can be any combination of: @code{REAL_AS_FLOAT}, -@code{PIPES_AS_CONCAT}, @code{ANSI_QUOTES}, @code{IGNORE_SPACE}, -@code{SERIALIZE}, @code{ONLY_FULL_GROUP_BY}. It can also be empty -(@code{""}) if you want to reset this. - -By specifying all of the above options is same as using --ansi. -With this option one can turn on only needed SQL modes. @xref{ANSI mode}. - -@item --temp-pool -Using this option will cause most temporary files created to use a small -set of names, rather than a unique name for each new file. This is to -work around a problem in the Linux kernel dealing with creating a bunch -of new files with different names. With the old behaviour, Linux seems to -'leak' memory, as it's being allocated to the directory entry cache -instead of the disk cache. - -@item --transaction-isolation= @{ READ-UNCOMMITTED | READ-COMMITTED | REPEATABLE-READ | SERIALIZABLE @} -Sets the default transaction isolation level. @xref{SET TRANSACTION}. - -@item -t, --tmpdir=path -Path for temporary files. It may be useful if your default @code{/tmp} -directory resides on a partition too small to hold temporary tables. - -@item -u, --user= [user_name | userid] -Run @code{mysqld} daemon as user @code{user_name} or @code{userid} (numeric). -This option is @strong{mandatory} when starting @code{mysqld} as root. - -@item -V, --version -Output version information and exit. - -@item -W, --log-warnings (Was --warnings) -Print out warnings like @code{Aborted connection...} to the @file{.err} file. -@xref{Communication errors}. -@end table - -One can change most values for a running server with the -@code{SET} command. @xref{SET OPTION}. - -@node Option files, Installing many servers, Command-line options, Configuring MySQL -@subsection @file{my.cnf} Option Files - -@cindex default options -@cindex option files -@cindex creating, default startup options -@cindex startup options, default - -MySQL can, since Version 3.22, read default startup options for the -server and for clients from option files. - -MySQL reads default options from the following files on Unix: - -@tindex .my.cnf file -@multitable @columnfractions .35 .50 -@item @strong{Filename} @tab @strong{Purpose} -@item @code{/etc/my.cnf} @tab Global options -@item @code{DATADIR/my.cnf} @tab Server-specific options -@item @code{defaults-extra-file} @tab The file specified with --defaults-extra-file=# -@item @code{~/.my.cnf} @tab User-specific options -@end multitable - -@code{DATADIR} is the MySQL data directory (typically -@file{/usr/local/mysql/data} for a binary installation or -@file{/usr/local/var} for a source installation). Note that this is the -directory that was specified at configuration time, not the one specified -with @code{--datadir} when @code{mysqld} starts up! (@code{--datadir} has no -effect on where the server looks for option files, because it looks for them -before it processes any command-line arguments.) - -MySQL reads default options from the following files on Windows: - -@multitable @columnfractions .35 .50 -@item @strong{Filename} @tab @strong{Purpose} -@item @code{windows-system-directory\my.ini} @tab Global options -@item @code{C:\my.cnf} @tab Global options -@end multitable - -Note that on Windows, you should specify all paths with @code{/} instead of -@code{\}. If you use @code{\}, you need to specify this twice, as -@code{\} is the escape character in MySQL. - -@cindex environment variables -MySQL tries to read option files in the order listed above. If -multiple option files exist, an option specified in a file read later takes -precedence over the same option specified in a file read earlier. Options -specified on the command-line take precedence over options specified in any -option file. Some options can be specified using environment variables. -Options specified on the command-line or in option files take precedence over -environment variable values. @xref{Environment variables}. - -The following programs support option files: @code{mysql}, -@code{mysqladmin}, @code{mysqld}, @code{mysqld_safe}, @code{mysql.server}, -@code{mysqldump}, @code{mysqlimport}, @code{mysqlshow}, @code{mysqlcheck}, -@code{myisamchk}, and @code{myisampack}. - -Any long option that may be given on the command-line when running a MySQL -program can be given in an option file as well (without the leading double -dash). Run the program with @code{--help} to get a list of available options. - -An option file can contain lines of the following forms: - -@table @code -@item #comment -Comment lines start with @samp{#} or @samp{;}. Empty lines are ignored. - -@item [group] -@code{group} is the name of the program or group for which you want to set -options. After a group line, any @code{option} or @code{set-variable} lines -apply to the named group until the end of the option file or another group -line is given. - -@item option -This is equivalent to @code{--option} on the command-line. - -@item option=value -This is equivalent to @code{--option=value} on the command-line. - -@item set-variable = variable=value -This is equivalent to @code{--set-variable variable=value} on the command-line. -This syntax must be used to set a @code{mysqld} variable. Please note that -@code{--set-variable} is deprecated since @strong{MySQL 4.0}, just use -@code{--variable=value} instead. -@end table - -The @code{client} group allows you to specify options that apply to all -MySQL clients (not @code{mysqld}). This is the perfect group to use -to specify the password you use to connect to the server. (But make -sure the option file is readable and writable only by yourself.) - -Note that for options and values, all leading and trailing blanks are -automatically deleted. You may use the escape sequences @samp{\b}, -@samp{\t}, @samp{\n}, @samp{\r}, @samp{\\}, and @samp{\s} in your value string -(@samp{\s} == blank). - -Here is a typical global option file: - -@example -[client] -port=3306 -socket=/tmp/mysql.sock - -[mysqld] -port=3306 -socket=/tmp/mysql.sock -set-variable = key_buffer_size=16M -set-variable = max_allowed_packet=1M - -[mysqldump] -quick -@end example - -Here is typical user option file: - -@example -[client] -# The following password will be sent to all standard MySQL clients -password=my_password - -[mysql] -no-auto-rehash -set-variable = connect_timeout=2 - -[mysqlhotcopy] -interactive-timeout - -@end example - -@tindex .my.cnf file -If you have a source distribution, you will find sample configuration -files named @file{my-xxxx.cnf} in the @file{support-files} directory. -If you have a binary distribution, look in the @file{DIR/support-files} -directory, where @code{DIR} is the pathname to the MySQL -installation directory (typically @file{/usr/local/mysql}). Currently -there are sample configuration files for small, medium, large, and very -large systems. You can copy @file{my-xxxx.cnf} to your home directory -(rename the copy to @file{.my.cnf}) to experiment with this. - -All MySQL clients that support option files support the -following options: - -@multitable @columnfractions .45 .55 -@item @strong{Option} @tab @strong{Description} -@item --no-defaults @tab Don't read any option files. -@item --print-defaults @tab Print the program name and all options that it will get. -@item --defaults-file=full-path-to-default-file @tab Only use the given configuration file. -@item --defaults-extra-file=full-path-to-default-file @tab Read this configuration file after the global configuration file but before the user configuration file. -@end multitable - -Note that the above options must be first on the command-line to work! -@code{--print-defaults} may however be used directly after the -@code{--defaults-xxx-file} commands. - -Note for developers: Option file handling is implemented simply by -processing all matching options (that is, options in the appropriate group) -before any command-line arguments. This works nicely for programs that use -the last instance of an option that is specified multiple times. If you have -an old program that handles multiply-specified options this way but doesn't -read option files, you need add only two lines to give it that capability. -Check the source code of any of the standard MySQL clients to see -how to do this. - -In shell scripts you can use the @file{my_print_defaults} command to parse the -config files: - -@example - -shell> my_print_defaults client mysql ---port=3306 ---socket=/tmp/mysql.sock ---no-auto-rehash -@end example - -The above output contains all options for the groups 'client' and 'mysql'. - - -@node Installing many servers, Multiple servers, Option files, Configuring MySQL -@subsection Installing Many Servers on the Same Machine - -@cindex post-install, many servers -@cindex Installing many servers -@cindex Starting many servers - -In some cases you may want to have many different @code{mysqld} daemons -(servers) running on the same machine. You may for example want to run -a new version of MySQL for testing together with an old version -that is in production. Another case is when you want to give different -users access to different @code{mysqld} servers that they manage themselves. - -One way to get a new server running is by starting it with a different -socket and port as follows: - -@tindex @code{MYSQL_UNIX_PORT} environment variable -@tindex @code{MYSQL_TCP_PORT} environment variable -@tindex environment variable, @code{MYSQL_UNIX_PORT} -@tindex environment variable, @code{MYSQL_TCP_PORT} -@example -shell> MYSQL_UNIX_PORT=/tmp/mysqld-new.sock -shell> MYSQL_TCP_PORT=3307 -shell> export MYSQL_UNIX_PORT MYSQL_TCP_PORT -shell> scripts/mysql_install_db -shell> bin/safe_mysqld & -@end example - -The environment variables appendix includes a list of other environment -variables you can use to affect @code{mysqld}. @xref{Environment variables}. - -The above is the quick and dirty way that one commonly uses for testing. -The nice thing with this is that all connections you do in the above shell -will automatically be directed to the new running server! - -If you need to do this more permanently, you should create an option -file for each server. @xref{Option files}. In your startup script that -is executed at boot time you should specify for both servers: - -@code{safe_mysqld --defaults-file=path-to-option-file} - -At least the following options should be different per server: - -@itemize -@item port=# -@item socket=path -@item pid-file=path -@end itemize - -The following options should be different, if they are used: - -@itemize -@item log=path -@item log-bin=path -@item log-update=path -@item log-isam=path -@item bdb-logdir=path -@end itemize - -If you want more performance, you can also specify the following differently: - -@itemize -@item tmpdir=path -@item bdb-tmpdir=path -@end itemize - -@xref{Command-line options}. - -If you are installing binary MySQL versions (.tar files) and -start them with @code{./bin/safe_mysqld} then in most cases the only -option you need to add/change is the @code{socket} and @code{port} -argument to @code{safe_mysqld}. - -@xref{Multiple servers, ,Running Multiple MySQL Servers on the Same Machine}. - -@node Multiple servers, , Installing many servers, Configuring MySQL -@subsection Running Multiple MySQL Servers on the Same Machine - -@cindex multiple servers -@cindex servers, multiple -@cindex running, multiple servers - -There are circumstances when you might want to run multiple servers on the same -machine. For example, you might want to test a new MySQL release -while leaving your existing production setup undisturbed. Or you might -be an Internet service provider that wants to provide independent -MySQL installations for different customers. - -If you want to run multiple servers, the easiest way is to compile the servers -with different TCP/IP ports and socket files so they are not -both listening to the same TCP/IP port or socket file. @xref{mysqld_multi, , -@code{mysqld_multi}}. - -Assume an existing server is configured for the default port number and -socket file. Then configure the new server with a @code{configure} command -something like this: - -@example -shell> ./configure --with-tcp-port=port_number \ - --with-unix-socket-path=file_name \ - --prefix=/usr/local/mysql-3.22.9 -@end example - -Here @code{port_number} and @code{file_name} should be different from the -default port number and socket file pathname, and the @code{--prefix} value -should specify an installation directory different from the one under which -the existing MySQL installation is located. - -You can check the socket used by any currently executing MySQL server -with this command: - -@example -shell> mysqladmin -h hostname --port=port_number variables -@end example - -Note that if you specify ``@code{localhost}'' as a hostname, @code{mysqladmin} -will default to using Unix sockets instead of TCP/IP. - -If you have a MySQL server running on the port you used, you will -get a list of some of the most important configurable variables in -MySQL, including the socket name. - -You don't have to recompile a new MySQL server just to start with -a different port and socket. You can change the port and socket to be used -by specifying them at runtime as options to @code{safe_mysqld}: - -@example -shell> /path/to/safe_mysqld --socket=file_name --port=port_number -@end example - -@code{mysqld_multi} can also take @code{safe_mysqld} (or @code{mysqld}) -as an argument and pass the options from a configuration file to -@code{safe_mysqld} and further to @code{mysqld}. - -If you run the new server on the same database directory as another -server with logging enabled, you should also specify the name of the log -files to @code{safe_mysqld} with @code{--log}, @code{--log-update}, or -@code{--log-slow-queries}. Otherwise, both servers may be trying to -write to the same log file. - -@strong{Warning}: normally you should never have two servers that update -data in the same database! If your OS doesn't support fault-free system -locking, this may lead to unpleasant surprises! - -If you want to use another database directory for the second server, you -can use the @code{--datadir=path} option to @code{safe_mysqld}. - -@strong{Note} also that starting several MySQL servers -(@code{mysqlds}) in different machines and letting them access one data -directory over @code{NFS} is generally a @strong{bad idea}! The problem -is that the @code{NFS} will become the bottleneck with the speed. It is -not meant for such use. And last but not least, you would still have to -come up with a solution how to make sure that two or more @code{mysqlds} -are not interfering with each other. At the moment there is no platform -that would 100% reliable do the file locking (@code{lockd} daemon -usually) in every situation. Yet there would be one more possible risk -with @code{NFS}; it would make the work even more complicated for -@code{lockd} daemon to handle. So make it easy for your self and forget -about the idea. The working solution is to have one computer with an -operating system that efficiently handles threads and have several CPUs -in it. - -When you want to connect to a MySQL server that is running with -a different port than the port that is compiled into your client, you -can use one of the following methods: - -@itemize @bullet -@item -Start the client with @code{--host 'hostname' --port=port_number} to connect -with TCP/IP, or @code{[--host localhost] --socket=file_name} to connect via -a Unix socket. - -@item -In your C or Perl programs, you can give the port or socket arguments -when connecting to the MySQL server. - -@item -If your are using the Perl @code{DBD::mysql} module you can read the options -from the MySQL option files. @xref{Option files}. - -@example -$dsn = "DBI:mysql:test;mysql_read_default_group=client; - mysql_read_default_file=/usr/local/mysql/data/my.cnf" -$dbh = DBI->connect($dsn, $user, $password); -@end example - -@item -@tindex MYSQL_UNIX_PORT environment variable -@tindex MYSQL_TCP_PORT environment variable -@tindex environment variable, MYSQL_UNIX_PORT -@tindex environment variable, MYSQL_TCP_PORT -Set the @code{MYSQL_UNIX_PORT} and @code{MYSQL_TCP_PORT} environment variables -to point to the Unix socket and TCP/IP port before you start your clients. -If you normally use a specific socket or port, you should place commands -to set these environment variables in your @file{.login} file. -@xref{Environment variables}. - -@item -@tindex .my.cnf file -Specify the default socket and TCP/IP port in the @file{.my.cnf} file in your -home directory. @xref{Option files}. -@end itemize - - -@node Privilege system, User Account Management, Configuring MySQL, MySQL Database Administration -@section General Security Issues and the MySQL Access Privilege System - -@cindex system, security -@cindex access privileges -@cindex privileges, access -@cindex security system -@cindex ACLs - -MySQL has an advanced but non-standard security/privilege -system. This section describes how it works. - -@menu -* General security:: General security -* Security:: How to make MySQL secure against crackers -* Privileges options:: Startup Options for @code{mysqld} Concerning Security -* LOAD DATA LOCAL:: -* What Privileges:: What the privilege system does -* Privileges:: How the privilege system works -* Privileges provided:: Privileges provided by MySQL -* Connecting:: Connecting to the MySQL server -* Connection access:: Access control, stage 1: Connection verification -* Request access:: Access control, stage 2: Request verification -* Access denied:: Causes of @code{Access denied} errors -@end menu - - -@node General security, Security, Privilege system, Privilege system -@subsection General Security Guidelines - -Anyone using MySQL on a computer connected to the Internet -should read this section to avoid the most common security mistakes. - -In discussing security, we emphasise the necessity of fully protecting the -entire server host (not simply the MySQL server) against all types -of applicable attacks: eavesdropping, altering, playback, and denial of -service. We do not cover all aspects of availability and fault tolerance -here. - -MySQL uses security based on Access Control Lists (ACLs) for all -connections, queries, and other operations that a user may attempt to -perform. There is also some support for SSL-encrypted connections -between MySQL clients and servers. Many of the concepts -discussed here are not specific to MySQL at all; the same -general ideas apply to almost all applications. - -When running MySQL, follow these guidelines whenever possible: - -@itemize @bullet -@item -@strong{Do not ever give anyone (except the mysql root user) access to the -@code{user} table in the @code{mysql} database!} This is critical. -@strong{The encrypted password is the real password in MySQL.} -Anyone who knows the password which is listed in the @code{user} table -and has access to the host listed for the account @strong{can easily log -in as that user}. - -@item -Learn the MySQL access privilege system. The @code{GRANT} and -@code{REVOKE} commands are used for controlling access to MySQL. Do -not grant any more privileges than necessary. Never grant privileges to all -hosts. - -Checklist: -@itemize @minus -@item -Try @code{mysql -u root}. If you are able to connect successfully to the -server without being asked for a password, you have problems. Anyone -can connect to your MySQL server as the MySQL -@code{root} user with full privileges! -Review the MySQL installation instructions, paying particular -attention to the item about setting a @code{root} password. -@item -Use the command @code{SHOW GRANTS} and check to see who has access to -what. Remove those privileges that are not necessary using the @code{REVOKE} -command. -@end itemize - -@item -Do not keep any plain-text passwords in your database. When your -computer becomes compromised, the intruder can take the full list of -passwords and use them. Instead use @code{MD5()}, @code{SHA1()} or -another one-way hashing function. -@item -Do not choose passwords from dictionaries. There are special programs to -break them. Even passwords like ``xfish98'' are very bad. Much better is -``duag98'' which contains the same word ``fish'' but typed one key to the -left on a standard QWERTY keyboard. Another method is to use ``Mhall'' which -is taken from the first characters of each word in the sentence ``Mary had -a little lamb.'' This is easy to remember and type, but difficult to guess -for someone who does not know it. -@item -Invest in a firewall. This protects you from at least 50% of all types of -exploits in any software. Put MySQL behind the firewall or in -a demilitarised zone (DMZ). - -Checklist: -@itemize @minus -@item -Try to scan your ports from the Internet using a tool such as -@code{nmap}. MySQL uses port 3306 by default. This port should -be inaccessible from untrusted hosts. Another simple way to check whether -or not your MySQL port is open is to try the following command -from some remote machine, where @code{server_host} is the hostname of -your MySQL server: - -@example -shell> telnet server_host 3306 -@end example - -If you get a connection and some garbage characters, the port is -open, and should be closed on your firewall or router, unless you really -have a good reason to keep it open. If @code{telnet} just hangs or the -connection is refused, everything is OK; the port is blocked. -@end itemize - -@item -Do not trust any data entered by your users. They can try to trick your -code by entering special or escaped character sequences in web forms, -URLs, or whatever application you have built. Be sure that your -application remains secure if a user enters something like ``@code{; DROP -DATABASE mysql;}''. This is an extreme example, but large security leaks -and data loss may occur as a result of hackers using similar techniques, -if you do not prepare for them. - -Also remember to check numeric data. A common mistake is to protect only -strings. Sometimes people think that if a database contains only publicly -available data that it need not be protected. This is incorrect. At least -denial-of-service type attacks can be performed on such -databases. The simplest way to protect from this type of attack is to use -apostrophes around the numeric constants: @code{SELECT * FROM table -WHERE ID='234'} rather than @code{SELECT * FROM table WHERE ID=234}. -MySQL automatically converts this string to a number and -strips all non-numeric symbols from it. - -Checklist: -@itemize @minus -@item -All web applications: -@itemize @bullet -@item -Try to enter @samp{'} and @samp{"} in all your web forms. If you get any kind -of MySQL error, investigate the problem right away. -@item -Try to modify any dynamic URLs by adding @code{%22} (@samp{"}), @code{%23} -(@samp{#}), and @code{%27} (@samp{'}) in the URL. -@item -Try to modify datatypes in dynamic URLs from numeric ones to character -ones containing characters from previous examples. Your application -should be safe against this and similar attacks. -@item -Try to enter characters, spaces, and special symbols instead of numbers in -numeric fields. Your application should remove them before passing them to -MySQL or your application should generate an error. Passing -unchecked values to MySQL is very dangerous! -@item -Check data sizes before passing them to MySQL. -@item -Consider having your application connect to the database using a -different user name than the one you use for administrative purposes. Do -not give your applications any more access privileges than they need. -@end itemize -@item -Users of PHP: -@itemize @bullet -@item Check out the @code{addslashes()} function. -As of PHP 4.0.3, a @code{mysql_escape_string()} function is available -that is based on the function of the same name in the MySQL C API. -@end itemize -@item -Users of MySQL C API: -@itemize @bullet -@item Check out the @code{mysql_real_escape_string()} API call. -@end itemize -@item -Users of MySQL++: -@itemize @bullet -@item Check out the @code{escape} and @code{quote} modifiers for query streams. -@end itemize -@item -Users of Perl DBI: -@itemize @bullet -@item Check out the @code{quote()} method or use placeholders. -@end itemize -@item -Users of Java JDBC: -@itemize @bullet -@item Use a @code{PreparedStatement} object and placeholders. -@end itemize -@end itemize - -@item -Do not transmit plain (unencrypted) data over the Internet. These data are -accessible to everyone who has the time and ability to intercept it and use -it for their own purposes. Instead, use an encrypted protocol such as SSL or -SSH. MySQL supports internal SSL connections as of Version 4.0.0. -SSH port-forwarding can be used to create an encrypted (and compressed) -tunnel for the communication. -@item -Learn to use the @code{tcpdump} and @code{strings} utilities. For most cases, -you can check whether MySQL data streams are unencrypted -by issuing a command like the following: - -@example -shell> tcpdump -l -i eth0 -w - src or dst port 3306 | strings -@end example - -(This works under Linux and should work with small modifications under -other systems.) Warning: If you do not see data this doesn't always -actually mean that it is encrypted. If you need high security, you should -consult with a security expert. -@end itemize - - -@node Security, Privileges options, General security, Privilege system -@subsection How to Make MySQL Secure Against Crackers - -@cindex crackers, security against -@cindex security, against crackers - -When you connect to a MySQL server, you normally should use a -password. The password is not transmitted in clear text over the -connection, however the encryption algorithm is not very strong, and -with some effort a clever attacker can crack the password if he is able -to sniff the traffic between the client and the server. If the -connection between the client and the server goes through an untrusted -network, you should use an SSH tunnel to encrypt the -communication. - -All other information is transferred as text that can be read by anyone -who is able to watch the connection. If you are concerned about this, -you can use the compressed protocol (in MySQL Version 3.22 and above) -to make things much harder. To make things even more secure you should use -@code{ssh}. You can find an @code{Open Source} @code{ssh} client at -@uref{http://www.openssh.org/}, and a commercial @code{ssh} client at -@uref{http://www.ssh.com/}. With this, you can get an encrypted TCP/IP -connection between a MySQL server and a MySQL client. - -If you are using MySQL 4.0, you can also use internal OpenSSL support. -@xref{Secure connections}. - -To make a MySQL system secure, you should strongly consider the -following suggestions: - -@itemize @bullet -@item -Use passwords for all MySQL users. Remember that anyone can log in -as any other person as simply as @code{mysql -u other_user db_name} if -@code{other_user} has no password. It is common behaviour with client/server -applications that the client may specify any user name. You can change the -password of all users by editing the @code{mysql_install_db} script before -you run it, or only the password for the MySQL @code{root} user like -this: - -@example -shell> mysql -u root mysql -mysql> UPDATE user SET Password=PASSWORD('new_password') - -> WHERE user='root'; -mysql> FLUSH PRIVILEGES; -@end example - -@item -Don't run the MySQL daemon as the Unix @code{root} user. This is -very dangerous, because any user with the @code{FILE} privilege will be able -to create files as @code{root} (for example, @code{~root/.bashrc}). To -prevent this, @code{mysqld} will refuse to run as @code{root} unless it -is specified directly using a @code{--user=root} option. - -@code{mysqld} can be run as an ordinary unprivileged user instead. -You can also create a new Unix user @code{mysql} to make everything -even more secure. If you run @code{mysqld} as another Unix user, -you don't need to change the @code{root} user name in the @code{user} -table, because MySQL user names have nothing to do with Unix -user names. To start @code{mysqld} as another Unix user, add a @code{user} -line that specifies the user name to the @code{[mysqld]} group of the -@file{/etc/my.cnf} option file or the @file{my.cnf} option file in the -server's data directory. For example: - -@example -[mysqld] -user=mysql -@end example - -This will cause the server to start as the designated user whether you -start it manually or by using @code{safe_mysqld} or @code{mysql.server}. -For more details, see @ref{Changing MySQL user}. - -@item -Don't support symlinks to tables (this can be disabled with the -@code{--skip-symlink} option). This is especially important if you run -@code{mysqld} as root as anyone that has write access to the mysqld data -directories could then delete any file in the system! -@xref{Symbolic links to tables}. - -@item -Check that the Unix user that @code{mysqld} runs as is the only user with -read/write privileges in the database directories. - -@item -Don't give the @code{PROCESS} privilege to all users. The output of -@code{mysqladmin processlist} shows the text of the currently executing -queries, so any user who is allowed to execute that command might be able to -see if another user issues an @code{UPDATE user SET -password=PASSWORD('not_secure')} query. - -@code{mysqld} reserves an extra connection for users who have the -@code{PROCESS} privilege, so that a MySQL @code{root} user can log -in and check things even if all normal connections are in use. - -@item -Don't give the @code{FILE} privilege to all users. Any user that has this -privilege can write a file anywhere in the filesystem with the privileges of -the @code{mysqld} daemon! To make this a bit safer, all files generated with -@code{SELECT ... INTO OUTFILE} are readable to everyone, and you cannot -overwrite existing files. - -@tindex @file{/etc/passwd} -The @code{FILE} privilege may also be used to read any file accessible -to the Unix user that the server runs as. This could be abused, for example, -by using @code{LOAD DATA} to load @file{/etc/passwd} into a table, which -can then be read with @code{SELECT}. - -@item -If you don't trust your DNS, you should use IP numbers instead of -hostnames in the grant tables. In any case, you should be very careful -about creating grant table entries using hostname values that contain -wildcards! - -@item -If you want to restrict the number of connections for a single user, you -can do this by setting the @code{max_user_connections} variable in -@code{mysqld}. -@end itemize - - -@node Privileges options, LOAD DATA LOCAL, Security, Privilege system -@subsection Startup Options for @code{mysqld} Concerning Security - -The following @code{mysqld} options affect security: - -@table @code -@item --local-infile[=(0|1)] -If one uses @code{--local-infile=0} then one can't use @code{LOAD DATA LOCAL -INFILE}. - -@item --safe-show-database -With this option, the @code{SHOW DATABASES} command returns only those -databases for which the user has some kind of privilege. -From version 4.0.2 this option is deprecated and doesn't do anything -(the option is enabled by default) as we now have the -@code{SHOW DATABASES} privilege. @xref{GRANT}. - -@item --safe-user-create -If this is enabled, an user can't create new users with the @code{GRANT} -command, if the user doesn't have the @code{INSERT} privilege for the -@code{mysql.user} table. If you want to give a user access to just create -new users with those privileges that the user has right to grant, you should -give the user the following privilege: - -@example -mysql> GRANT INSERT(user) ON mysql.user TO 'user'@@'hostname'; -@end example - -This will ensure that the user can't change any privilege columns directly, -but has to use the @code{GRANT} command to give privileges to other users. - -@item --skip-grant-tables -This option causes the server not to use the privilege system at all. This -gives everyone @strong{full access} to all databases! (You can tell a running -server to start using the grant tables again by executing @code{mysqladmin -flush-privileges} or @code{mysqladmin reload}.) - -@item --skip-name-resolve -Hostnames are not resolved. All @code{Host} column values in the grant -tables must be IP numbers or @code{localhost}. - -@item --skip-networking -Don't allow TCP/IP connections over the network. All connections to -@code{mysqld} must be made via Unix sockets. -This option is unsuitable when using a MySQL version prior to 3.23.27 with -the MIT-pthreads package, because Unix sockets were not supported by -MIT-pthreads at that time. - -@item --skip-show-database -Don't allow @code{SHOW DATABASES} command, unless the user has the -@code{SHOW DATABASES} privilege. From version 4.0.2 you should no longer -need this option, since access can now be granted specifically with the -@code{SHOW DATABASES} privilege. - -@end table - -@node LOAD DATA LOCAL, What Privileges, Privileges options, Privilege system -@subsection Security issues with LOAD DATA LOCAL - -In MySQL 3.23.49 and MySQL 4.0.2, we added some new options to deal with -possible security issues when it comes to @code{LOAD DATA LOCAL}. - -There are two possible problems with supporting this command: - -As the reading of the file is initiated from the server, one could -theoretically create a patched MySQL server that could read any file on -the client machine that the current user has read access to, when -the client issues a query against the table. - -In a web environment where the clients are connecting from a web -server, a user could use @code{LOAD DATA LOCAL} to read any files -that the web server process has read access to (assuming a user could -run any command against the SQL server). - -There are two separate fixes for this: - -If you don't configure MySQL with @code{--enable-local-infile}, then -@code{LOAD DATA LOCAL} will be disabled by all clients, unless one -calls @code{mysql_options(... MYSQL_OPT_LOCAL_INFILE, 0)} in the client. -@xref{mysql_options, , @code{mysql_options()}}. - -For the @code{mysql} command-line client, @code{LOAD DATA LOCAL} can be -enabled by specifying the option @code{--local-infile[=1]}, or disabled -with @code{--local-infile=0}. - -By default, all MySQL clients and libraries are compiled with -@code{--enable-local-infile}, to be compatible with MySQL 3.23.48 and -before. - -One can disable all @code{LOAD DATA LOCAL} commands in the MySQL server -by starting @code{mysqld} with @code{--local-infile=0}. - -In the case that @code{LOAD DATA LOCAL INFILE} is disabled in the server or -the client, you will get the error message (1148): - -@example -The used command is not allowed with this MySQL version -@end example - -@node What Privileges, Privileges, LOAD DATA LOCAL, Privilege system -@subsection What the Privilege System Does - -@cindex system, privilege -@cindex privilege system -@cindex passwords, security - -The primary function of the MySQL privilege system is to -authenticate a user connecting from a given host, and to associate that user -with privileges on a database such as -@code{SELECT}, @code{INSERT}, @code{UPDATE} and @code{DELETE}. - -Additional functionality includes the ability to have an anonymous user and -to grant privileges for MySQL-specific functions such as @code{LOAD -DATA INFILE} and administrative operations. - - -@node Privileges, Privileges provided, What Privileges, Privilege system -@subsection How the Privilege System Works - -@cindex privilege system, described - -The MySQL privilege system ensures that all users may do exactly the -things that they are supposed to be allowed to do. When you connect to a -MySQL server, your identity is determined by @strong{the host from -which you connect} and @strong{the user name you specify}. The system grants -privileges according to your identity and @strong{what you want to do}. - -MySQL considers both your hostname and user name in identifying you -because there is little reason to assume that a given user name belongs to -the same person everywhere on the Internet. For example, the user -@code{joe} who connects from @code{office.com} need not be the same -person as the user @code{joe} who connects from @code{elsewhere.com}. -MySQL handles this by allowing you to distinguish users on different -hosts that happen to have the same name: you can grant @code{joe} one set -of privileges for connections from @code{office.com}, and a different set -of privileges for connections from @code{elsewhere.com}. - -MySQL access control involves two stages: - -@itemize @bullet -@item -Stage 1: The server checks whether you are even allowed to connect. - -@item -Stage 2: Assuming you can connect, the server checks each request you issue -to see whether you have sufficient privileges to perform it. For -example, if you try to select rows from a table in a database or drop a table -from the database, the server makes sure you have the @code{SELECT} -privilege for the table or the @code{DROP} privilege for the database. -@end itemize - -The server uses the @code{user}, @code{db}, and @code{host} tables in the -@code{mysql} database at both stages of access control. The fields in these -grant tables are shown here: - -@multitable @columnfractions .20 .20 .20 .20 -@item @strong{Table name} @tab @code{user} @tab @code{db} @tab @code{host} - -@item @strong{Scope fields} @tab @code{Host} @tab @code{Host} @tab @code{Host} -@item @tab @code{User} @tab @code{Db} @tab @code{Db} -@item @tab @code{Password} @tab @code{User} @tab - -@item @strong{Privilege fields} @tab @code{Select_priv} @tab @code{Select_priv} @tab @code{Select_priv} -@item @tab @code{Insert_priv} @tab @code{Insert_priv} @tab @code{Insert_priv} -@item @tab @code{Update_priv} @tab @code{Update_priv} @tab @code{Update_priv} -@item @tab @code{Delete_priv} @tab @code{Delete_priv} @tab @code{Delete_priv} -@item @tab @code{Index_priv} @tab @code{Index_priv} @tab @code{Index_priv} -@item @tab @code{Alter_priv} @tab @code{Alter_priv} @tab @code{Alter_priv} -@item @tab @code{Create_priv} @tab @code{Create_priv} @tab @code{Create_priv} -@item @tab @code{Drop_priv} @tab @code{Drop_priv} @tab @code{Drop_priv} -@item @tab @code{Grant_priv} @tab @code{Grant_priv} @tab @code{Grant_priv} -@item @tab @code{References_priv} @tab @tab -@item @tab @code{Reload_priv} @tab @tab -@item @tab @code{Shutdown_priv} @tab @tab -@item @tab @code{Process_priv} @tab @tab -@item @tab @code{File_priv} @tab @tab -@end multitable - -For the second stage of access control (request verification), the server -may, if the request involves tables, additionally consult the -@code{tables_priv} and @code{columns_priv} tables. The fields in these -tables are shown here: - -@multitable @columnfractions .20 .20 .20 -@item @strong{Table name} @tab @code{tables_priv} @tab @code{columns_priv} - -@item @strong{Scope fields} @tab @code{Host} @tab @code{Host} -@item @tab @code{Db} @tab @code{Db} -@item @tab @code{User} @tab @code{User} -@item @tab @code{Table_name} @tab @code{Table_name} -@item @tab @tab @code{Column_name} - -@item @strong{Privilege fields} @tab @code{Table_priv} @tab @code{Column_priv} -@item @tab @code{Column_priv} @tab - -@item @strong{Other fields} @tab @code{Timestamp} @tab @code{Timestamp} -@item @tab @code{Grantor} @tab -@end multitable - -Each grant table contains scope fields and privilege fields. - -Scope fields determine the scope of each entry in the tables, that is, the -context in which the entry applies. For example, a @code{user} table entry -with @code{Host} and @code{User} values of @code{'thomas.loc.gov'} and -@code{'bob'} would be used for authenticating connections made to the server -by @code{bob} from the host @code{thomas.loc.gov}. Similarly, a @code{db} -table entry with @code{Host}, @code{User}, and @code{Db} fields of -@code{'thomas.loc.gov'}, @code{'bob'} and @code{'reports'} would be used when -@code{bob} connects from the host @code{thomas.loc.gov} to access the -@code{reports} database. The @code{tables_priv} and @code{columns_priv} -tables contain scope fields indicating tables or table/column combinations -to which each entry applies. - -@cindex case-sensitivity, in access checking -For access-checking purposes, comparisons of @code{Host} values are -case-insensitive. @code{User}, @code{Password}, @code{Db}, and -@code{Table_name} values are case-sensitive. -@code{Column_name} values are case-insensitive in MySQL Version -3.22.12 or later. - -Privilege fields indicate the privileges granted by a table entry, that is, -what operations can be performed. The server combines the information in the -various grant tables to form a complete description of a user's privileges. -The rules used to do this are described in @ref{Request access}. - -Scope fields are strings, declared as shown here; the default value for -each is the empty string: - -@multitable @columnfractions .20 .15 .65 -@item @strong{Field name} @tab @strong{Type} @tab @strong{Notes} -@item @code{Host} @tab @code{CHAR(60)} @tab -@item @code{User} @tab @code{CHAR(16)} @tab -@item @code{Password} @tab @code{CHAR(16)} @tab -@item @code{Db} @tab @code{CHAR(64)} @tab (@code{CHAR(60)} for the -@code{tables_priv} and @code{columns_priv} tables) -@item @code{Table_name} @tab @code{CHAR(60)} @tab -@item @code{Column_name} @tab @code{CHAR(60)} @tab -@end multitable - -In the @code{user}, @code{db} and @code{host} tables, -all privilege fields are declared as @code{ENUM('N','Y')}@-each can have a -value of @code{'N'} or @code{'Y'}, and the default value is @code{'N'}. - -In the @code{tables_priv} and @code{columns_priv} tables, the privilege -fields are declared as @code{SET} fields: - -@multitable @columnfractions .15 .15 .55 -@item @strong{Table name} - @tab @strong{Field name} - @tab @strong{Possible set elements} -@item @code{tables_priv} - @tab @code{Table_priv} - @tab @code{'Select', 'Insert', 'Update', 'Delete', 'Create', 'Drop', 'Grant', 'References', 'Index', 'Alter'} -@item @code{tables_priv} - @tab @code{Column_priv} - @tab @code{'Select', 'Insert', 'Update', 'References'} -@item @code{columns_priv} - @tab @code{Column_priv} - @tab @code{'Select', 'Insert', 'Update', 'References'} -@end multitable - -Briefly, the server uses the grant tables like this: - -@itemize @bullet -@item -The @code{user} table scope fields determine whether to allow or reject -incoming connections. For allowed connections, any privileges granted in -the @code{user} table indicate the user's global (superuser) privileges. -These privileges apply to @strong{all} databases on the server. - -@item -The @code{db} and @code{host} tables are used together: - -@itemize @minus -@item -The @code{db} table scope fields determine which users can access which -databases from which hosts. The privilege fields determine which operations -are allowed. - -@item -The @code{host} table is used as an extension of the @code{db} table when you -want a given @code{db} table entry to apply to several hosts. For example, -if you want a user to be able to use a database from several hosts in -your network, leave the @code{Host} value empty in the user's @code{db} table -entry, then populate the @code{host} table with an entry for each of those -hosts. This mechanism is described more detail in @ref{Request access}. -@end itemize - -@item -The @code{tables_priv} and @code{columns_priv} tables are similar to -the @code{db} table, but are more fine-grained: they apply at the -table and column levels rather than at the database level. -@end itemize - -Note that administrative privileges (@code{RELOAD}, @code{SHUTDOWN}, -etc.) are specified only in the @code{user} table. This is because -administrative operations are operations on the server itself and are not -database-specific, so there is no reason to list such privileges in the -other grant tables. In fact, only the @code{user} table need -be consulted to determine whether you can perform an administrative -operation. - -The @code{FILE} privilege is specified only in the @code{user} table, too. -It is not an administrative privilege as such, but your ability to read or -write files on the server host is independent of the database you are -accessing. - -The @code{mysqld} server reads the contents of the grant tables once, when it -starts up. Changes to the grant tables take effect as indicated in -@ref{Privilege changes}. - -When you modify the contents of the grant tables, it is a good idea to make -sure that your changes set up privileges the way you want. For help in -diagnosing problems, see @ref{Access denied}. For advice on security issues, -see @ref{Security}. - -A useful -diagnostic tool is the @code{mysqlaccess} script, which Yves Carlier has -provided for the MySQL distribution. Invoke @code{mysqlaccess} with -the @code{--help} option to find out how it works. -Note that @code{mysqlaccess} checks access using only the @code{user}, -@code{db} and @code{host} tables. It does not check table- or column-level -privileges. - - -@node Privileges provided, Connecting, Privileges, Privilege system -@subsection Privileges Provided by MySQL - -@cindex privilege information, location - -Information about user privileges is stored in the @code{user}, @code{db}, -@code{host}, @code{tables_priv}, and @code{columns_priv} tables in the -@code{mysql} database (that is, in the database named @code{mysql}). The -MySQL server reads the contents of these tables when it starts up -and under the circumstances indicated in @ref{Privilege changes}. - -The names used in this manual to refer to the privileges provided by -MySQL version 4.0.2 are shown here, along with the table column name -associated with each privilege in the grant tables and the context in -which the privilege applies: - -@c FIX agl 2002-06-13 Long items added, will need to re-measure colwidths! -@multitable @columnfractions .15 .20 .35 -@item @strong{Privilege} @tab @strong{Column} @tab @strong{Context} -@item @code{ALTER} @tab @code{Alter_priv} @tab tables -@item @code{DELETE} @tab @code{Delete_priv} @tab tables -@item @code{INDEX} @tab @code{Index_priv} @tab tables -@item @code{INSERT} @tab @code{Insert_priv} @tab tables -@item @code{SELECT} @tab @code{Select_priv} @tab tables -@item @code{UPDATE} @tab @code{Update_priv} @tab tables -@item @code{CREATE} @tab @code{Create_priv} @tab databases, tables, or indexes -@item @code{DROP} @tab @code{Drop_priv} @tab databases or tables -@item @code{GRANT} @tab @code{Grant_priv} @tab databases or tables -@item @code{REFERENCES} @tab @code{References_priv} @tab databases or tables -@item @code{CREATE TEMPORARY TABLES} @tab @code{Create_tmp_table_priv} @tab server administration -@item @code{EXECUTE} @tab @code{Execute_priv} @tab server administration -@item @code{FILE} @tab @code{File_priv} @tab file access on server -@item @code{LOCK TABLES} @tab @code{Lock_tables_priv} @tab server administration -@item @code{PROCESS} @tab @code{Process_priv} @tab server administration -@item @code{RELOAD} @tab @code{Reload_priv} @tab server administration -@item @code{REPLICATION CLIENT} @tab @code{Repl_client_priv} @tab server administration -@item @code{REPLICATION SLAVE} @tab @code{Repl_slave_priv} @tab server administration -@item @code{SHOW DATABASES} @tab @code{Show_db_priv} @tab server administration -@item @code{SHUTDOWN} @tab @code{Shutdown_priv} @tab server administration -@item @code{SUPER} @tab @code{Super_priv} @tab server administration -@end multitable - -The @code{SELECT}, @code{INSERT}, @code{UPDATE}, and @code{DELETE} -privileges allow you to perform operations on rows in existing tables in -a database. - -@code{SELECT} statements require the @code{SELECT} privilege only if they -actually retrieve rows from a table. You can execute certain @code{SELECT} -statements even without permission to access any of the databases on the -server. For example, you could use the @code{mysql} client as a simple -calculator: - -@example -mysql> SELECT 1+1; -mysql> SELECT PI()*2; -@end example - -The @code{INDEX} privilege allows you to create or drop (remove) indexes. - -The @code{ALTER} privilege allows you to use @code{ALTER TABLE}. - -The @code{CREATE} and @code{DROP} privileges allow you to create new -databases and tables, or to drop (remove) existing databases and tables. - -Note that if you grant the @code{DROP} privilege for the @code{mysql} -database to a user, that user can drop the database in which the -MySQL access privileges are stored! - -The @code{GRANT} privilege allows you to give to other users those -privileges you yourself possess. - -The @code{FILE} privilege gives you permission to read and write files on -the server using the @code{LOAD DATA INFILE} and @code{SELECT ... INTO -OUTFILE} statements. Any user to whom this privilege is granted can read or -write any file that the MySQL server can read or write. - -The remaining privileges are used for administrative operations, which are -performed using the @code{mysqladmin} program. The table here shows which -@code{mysqladmin} commands each administrative privilege allows you to -execute: - -@multitable @columnfractions .15 .75 -@item @strong{Privilege} @tab @strong{Commands permitted to privilege holders} -@item @code{RELOAD} @tab @code{reload}, @code{refresh}, -@code{flush-privileges}, @code{flush-hosts}, @code{flush-logs}, and -@code{flush-tables} -@item @code{SHUTDOWN} @tab @code{shutdown} -@item @code{PROCESS} @tab @code{processlist} -@item @code{SUPER} @tab @code{kill} -@end multitable - -The @code{reload} command tells the server to re-read the grant tables. The -@code{refresh} command flushes all tables and opens and closes the log -files. @code{flush-privileges} is a synonym for @code{reload}. The other -@code{flush-*} commands perform functions similar to @code{refresh} but are -more limited in scope, and may be preferable in some instances. For example, -if you want to flush just the log files, @code{flush-logs} is a better choice -than @code{refresh}. - -The @code{shutdown} command shuts down the server. - -The @code{processlist} command displays information about the threads -executing within the server. The @code{kill} command kills server -threads. You can always display or kill your own threads, but you need -the @code{PROCESS} privilege to display and @code{SUPER} privilege to -kill threads initiated by other users. @xref{KILL}. - -It is a good idea in general to grant privileges only to those users who need -them, but you should exercise particular caution in granting certain -privileges: - -@itemize @bullet -@item -The @code{GRANT} privilege allows users to give away their privileges to -other users. Two users with different privileges and with the @code{GRANT} -privilege are able to combine privileges. - -@item -The @code{ALTER} privilege may be used to subvert the privilege system -by renaming tables. - -@item -The @code{FILE} privilege can be abused to read any world-readable file on -the server into a database table, the contents of which can then be -accessed using @code{SELECT}. This includes the contents of all databases -hosted by the server! - -@item -The @code{SHUTDOWN} privilege can be abused to deny service to other -users entirely, by terminating the server. - -@item -The @code{PROCESS} privilege can be used to view the plain text of -currently executing queries, including queries that set or change passwords. - -@item -Privileges on the @code{mysql} database can be used to change passwords -and other access privilege information. (Passwords are stored -encrypted, so a malicious user cannot simply read them to know the plain -text password.) If they can access the @code{mysql.user} password -column, they can use it to log into the MySQL server -for the given user. (With sufficient privileges, the same user can -replace a password with a different one.) -@end itemize - -There are some things that you cannot do with the MySQL -privilege system: - -@itemize @bullet -@item -You cannot explicitly specify that a given user should be denied access. -That is, you cannot explicitly match a user and then refuse the connection. - -@item -You cannot specify that a user has privileges to create or drop tables -in a database but not to create or drop the database itself. -@end itemize - - -@node Connecting, Connection access, Privileges provided, Privilege system -@subsection Connecting to the MySQL Server - -@cindex connecting, to the server -@cindex default hostname -@cindex hostname, default -@cindex server, connecting - -MySQL client programs generally require that you specify connection -parameters when you want to access a MySQL server: the host you want -to connect to, your user name, and your password. For example, the -@code{mysql} client can be started like this (optional arguments are enclosed -between @samp{[} and @samp{]}): - -@example -shell> mysql [-h host_name] [-u user_name] [-pyour_pass] -@end example - -Alternate forms of the @code{-h}, @code{-u}, and @code{-p} options are -@code{--host=host_name}, @code{--user=user_name}, and -@code{--password=your_pass}. Note that there is @emph{no space} between -@code{-p} or @code{--password=} and the password following it. - -@strong{Note}: Specifying a password on the command-line is not secure! -Any user on your system may then find out your password by typing a command -like: @code{ps auxww}. @xref{Option files}. - -@code{mysql} uses default values for connection parameters that are missing -from the command-line: - -@itemize @bullet -@item -The default hostname is @code{localhost}. - -@item -The default user name is your Unix login name. - -@item -No password is supplied if @code{-p} is missing. -@end itemize - -Thus, for a Unix user @code{joe}, the following commands are equivalent: - -@example -shell> mysql -h localhost -u joe -shell> mysql -h localhost -shell> mysql -u joe -shell> mysql -@end example - -Other MySQL clients behave similarly. - -On Unix systems, you can specify different default values to be used when you -make a connection, so that you need not enter them on the command-line each -time you invoke a client program. This can be done in a couple of ways: - -@itemize @bullet -@item -@tindex .my.cnf file -You can specify connection parameters in the @code{[client]} section of the -@file{.my.cnf} configuration file in your home directory. The relevant -section of the file might look like this: - -@example -[client] -host=host_name -user=user_name -password=your_pass -@end example - -@xref{Option files}. - -@item -@tindex @code{MYSQL_HOST} environment variable -@tindex environment variable, @code{MYSQL_HOST} -@tindex @code{MYSQL_PWD} environment variable -@tindex environment variable, @code{MYSQL_PWD} -@tindex @code{USER} environment variable -@tindex environment variable, @code{USER} -You can specify connection parameters using environment variables. The -host can be specified for @code{mysql} using @code{MYSQL_HOST}. The -MySQL user name can be specified using @code{USER} (this is for -Windows only). The password can be specified using @code{MYSQL_PWD} -(but this is insecure; see the next section). @xref{Environment variables}. -@end itemize - - -@node Connection access, Request access, Connecting, Privilege system -@subsection Access Control, Stage 1: Connection Verification - -@cindex access control -@cindex control access -@cindex connecting, verification -@cindex testing, connection to the server - -When you attempt to connect to a MySQL server, the server accepts or -rejects the connection based on your identity and whether you can -verify your identity by supplying the correct password. If not, the server -denies access to you completely. Otherwise, the server accepts the -connection, then enters Stage 2 and waits for requests. - -Your identity is based on two pieces of information: - -@itemize @bullet -@item -The host from which you connect - -@item -Your MySQL user name -@end itemize - -Identity checking is performed using the three @code{user} table scope fields -(@code{Host}, @code{User}, and @code{Password}). The server accepts the -connection only if a @code{user} table entry matches your hostname and user -name, and you supply the correct password. - -Values in the @code{user} table scope fields may be specified as follows: - -@itemize @bullet -@item -A @code{Host} value may be a hostname or an IP number, or @code{'localhost'} -to indicate the local host. - -@item -@cindex wildcards, in @code{mysql.user} table -You can use the wildcard characters @samp{%} and @samp{_} in the @code{Host} -field. - -@item -A @code{Host} value of @code{'%'} matches any hostname. - -@item -A blank @code{Host} value means that the privilege should be anded -with the entry in the @code{host} table that matches the given host name. -You can find more information about this in the next chapter. - -@cindex netmask notation, in @code{mysql.user} table -@item -As of MySQL Version 3.23, for @code{Host} values specified as -IP numbers, you can specify a netmask indicating how many address bits to -use for the network number. For example: - -@example -mysql> GRANT ALL PRIVILEGES ON db.* - -> TO david@@'192.58.197.0/255.255.255.0'; -@end example - -This will allow everyone to connect from an IP where the following is true: - -@example -user_ip & netmask = host_ip. -@end example - -In the above example all IP:s in the interval 192.58.197.0 - -192.58.197.255 can connect to the MySQL server. - -@item -@cindex anonymous user -Wildcard characters are not allowed in the @code{User} field, but you can -specify a blank value, which matches any name. If the @code{user} table -entry that matches an incoming connection has a blank user name, the user is -considered to be the anonymous user (the user with no name), rather than the -name that the client actually specified. This means that a blank user name -is used for all further access checking for the duration of the connection -(that is, during Stage 2). - -@item -The @code{Password} field can be blank. This does not mean that any password -matches, it means the user must connect without specifying a password. -@end itemize - -@findex PASSWORD() -Non-blank @code{Password} values represent encrypted passwords. -MySQL does not store passwords in plaintext form for anyone to -see. Rather, the password supplied by a user who is attempting to -connect is encrypted (using the @code{PASSWORD()} function). The -encrypted password is then used when the client/server is checking if -the password is correct. (This is done without the encrypted password -ever traveling over the connection.) Note that from MySQL's -point of view the encrypted password is the REAL password, so you should -not give anyone access to it! In particular, don't give normal users -read access to the tables in the @code{mysql} database! - -The examples here show how various combinations of @code{Host} and -@code{User} values in @code{user} table entries apply to incoming -connections: - -@multitable @columnfractions .35 .15 .50 -@item @code{Host} @strong{value} @tab @code{User} @strong{value} @tab @strong{Connections matched by entry} -@item @code{'thomas.loc.gov'} @tab @code{'fred'} @tab @code{fred}, connecting from @code{thomas.loc.gov} -@item @code{'thomas.loc.gov'} @tab @code{''} @tab Any user, connecting from @code{thomas.loc.gov} -@item @code{'%'} @tab @code{'fred'} @tab @code{fred}, connecting from any host -@item @code{'%'} @tab @code{''} @tab Any user, connecting from any host -@item @code{'%.loc.gov'} @tab @code{'fred'} @tab @code{fred}, connecting from any host in the @code{loc.gov} domain -@item @code{'x.y.%'} @tab @code{'fred'} @tab @code{fred}, connecting from @code{x.y.net}, @code{x.y.com},@code{x.y.edu}, etc. (this is probably not useful) -@item @code{'144.155.166.177'} @tab @code{'fred'} @tab @code{fred}, connecting from the host with IP address @code{144.155.166.177} -@item @code{'144.155.166.%'} @tab @code{'fred'} @tab @code{fred}, connecting from any host in the @code{144.155.166} class C subnet -@item @code{'144.155.166.0/255.255.255.0'} @tab @code{'fred'} @tab Same as previous example -@end multitable - -Because you can use IP wildcard values in the @code{Host} field (for example, -@code{'144.155.166.%'} to match every host on a subnet), there is the -possibility that someone might try to exploit this capability by naming a -host @code{144.155.166.somewhere.com}. To foil such attempts, MySQL -disallows matching on hostnames that start with digits and a dot. Thus, if -you have a host named something like @code{1.2.foo.com}, its name will never -match the @code{Host} column of the grant tables. Only an IP number can -match an IP wildcard value. - -An incoming connection may be matched by more than one entry in the -@code{user} table. For example, a connection from @code{thomas.loc.gov} by -@code{fred} would be matched by several of the entries just shown above. How -does the server choose which entry to use if more than one matches? The -server resolves this question by sorting the @code{user} table after reading -it at startup time, then looking through the entries in sorted order when a -user attempts to connect. The first matching entry is the one that is used. - -@code{user} table sorting works as follows. Suppose the @code{user} table -looks like this: - -@example -+-----------+----------+- -| Host | User | ... -+-----------+----------+- -| % | root | ... -| % | jeffrey | ... -| localhost | root | ... -| localhost | | ... -+-----------+----------+- -@end example - -When the server reads in the table, it orders the entries with the -most-specific @code{Host} values first (@code{'%'} in the @code{Host} column -means ``any host'' and is least specific). Entries with the same @code{Host} -value are ordered with the most-specific @code{User} values first (a blank -@code{User} value means ``any user'' and is least specific). The resulting -sorted @code{user} table looks like this: - -@example -+-----------+----------+- -| Host | User | ... -+-----------+----------+- -| localhost | root | ... -| localhost | | ... -| % | jeffrey | ... -| % | root | ... -+-----------+----------+- -@end example - -@cindex grant tables, sorting -@cindex sorting, grant tables -@cindex @code{user} table, sorting -When a connection is attempted, the server looks through the sorted entries -and uses the first match found. For a connection from @code{localhost} by -@code{jeffrey}, the entries with @code{'localhost'} in the @code{Host} column -match first. Of those, the entry with the blank user name matches both the -connecting hostname and user name. (The @code{'%'/'jeffrey'} entry would -have matched, too, but it is not the first match in the table.) - -Here is another example. Suppose the @code{user} table looks like this: - -@example -+----------------+----------+- -| Host | User | ... -+----------------+----------+- -| % | jeffrey | ... -| thomas.loc.gov | | ... -+----------------+----------+- -@end example - -The sorted table looks like this: - -@example -+----------------+----------+- -| Host | User | ... -+----------------+----------+- -| thomas.loc.gov | | ... -| % | jeffrey | ... -+----------------+----------+- -@end example - -A connection from @code{thomas.loc.gov} by @code{jeffrey} is matched by the -first entry, whereas a connection from @code{whitehouse.gov} by -@code{jeffrey} is matched by the second. - -A common misconception is to think that for a given user name, all entries -that explicitly name that user will be used first when the server attempts to -find a match for the connection. This is simply not true. The previous -example illustrates this, where a connection from @code{thomas.loc.gov} by -@code{jeffrey} is first matched not by the entry containing @code{'jeffrey'} -as the @code{User} field value, but by the entry with no user name! - -If you have problems connecting to the server, print out the @code{user} -table and sort it by hand to see where the first match is being made. - - -@node Request access, Access denied, Connection access, Privilege system -@subsection Access Control, Stage 2: Request Verification - -Once you establish a connection, the server enters Stage 2. For each request -that comes in on the connection, the server checks whether you have -sufficient privileges to perform it, based on the type of operation you wish -to perform. This is where the privilege fields in the grant tables come into -play. These privileges can come from any of the @code{user}, @code{db}, -@code{host}, @code{tables_priv}, or @code{columns_priv} tables. The grant -tables are manipulated with @code{GRANT} and @code{REVOKE} commands. -@xref{GRANT, , @code{GRANT}}. (You may find it helpful to refer to -@ref{Privileges}, which lists the fields present in each of the grant -tables.) - -The @code{user} table grants privileges that are assigned to you on a global -basis and that apply no matter what the current database is. For example, if -the @code{user} table grants you the @code{DELETE} privilege, you can -delete rows from any database on the server host! In other words, -@code{user} table privileges are superuser privileges. It is wise to grant -privileges in the @code{user} table only to superusers such as server or -database administrators. For other users, you should leave the privileges -in the @code{user} table set to @code{'N'} and grant privileges on a -database-specific basis only, using the @code{db} and @code{host} tables. - -@cindex anonymous user -@cindex wildcards, in @code{mysql.db} table -@cindex wildcards, in @code{mysql.host} table -The @code{db} and @code{host} tables grant database-specific privileges. -Values in the scope fields may be specified as follows: - -@itemize @bullet -@item -The wildcard characters @samp{%} and @samp{_} can be used in the @code{Host} -and @code{Db} fields of either table. If you wish to use for instance a -@samp{_} character as part of a database name, specify it as @samp{\_} in -the @code{GRANT} command. - -@item -A @code{'%'} @code{Host} value in the @code{db} table means ``any host.'' A -blank @code{Host} value in the @code{db} table means ``consult the -@code{host} table for further information.'' - -@item -A @code{'%'} or blank @code{Host} value in the @code{host} table means ``any -host.'' - -@item -A @code{'%'} or blank @code{Db} value in either table means ``any database.'' - -@item -A blank @code{User} value in either table matches the anonymous user. -@end itemize - -@cindex grant tables, sorting -@cindex sorting, grant tables -@cindex @code{db} table, sorting -@cindex @code{host} table, sorting -The @code{db} and @code{host} tables are read in and sorted when the server -starts up (at the same time that it reads the @code{user} table). The -@code{db} table is sorted on the @code{Host}, @code{Db}, and @code{User} scope -fields, and the @code{host} table is sorted on the @code{Host} and @code{Db} -scope fields. As with the @code{user} table, sorting puts the most-specific -values first and least-specific values last, and when the server looks for -matching entries, it uses the first match that it finds. - - -@cindex wildcards, in @code{mysql.tables_priv} table -@cindex wildcards, in @code{mysql.columns_priv} table -The @code{tables_priv} and @code{columns_priv} tables grant table- and -column-specific privileges. Values in the scope fields may be specified as -follows: - -@itemize @bullet -@item -The wildcard characters @samp{%} and @samp{_} -can be used in the @code{Host} field of either table. - -@item -A @code{'%'} or blank @code{Host} value in either table means ``any host.'' - -@item -The @code{Db}, @code{Table_name} and @code{Column_name} fields cannot contain -wildcards or be blank in either table. -@end itemize - -The @code{tables_priv} and @code{columns_priv} tables are sorted on -the @code{Host}, @code{Db}, and @code{User} fields. This is similar to -@code{db} table sorting, although the sorting is simpler because -only the @code{Host} field may contain wildcards. - -The request verification process is described here. (If you are familiar -with the access-checking source code, you will notice that the description -here differs slightly from the algorithm used in the code. The description -is equivalent to what the code actually does; it differs only to make the -explanation simpler.) - -For administrative requests (@code{SHUTDOWN}, @code{RELOAD}, etc.), the -server checks only the @code{user} table entry, because that is the only table -that specifies administrative privileges. Access is granted if the entry -allows the requested operation and denied otherwise. For example, if you -want to execute @code{mysqladmin shutdown} but your @code{user} table entry -doesn't grant the @code{SHUTDOWN} privilege to you, access is denied -without even checking the @code{db} or @code{host} tables. (They -contain no @code{Shutdown_priv} column, so there is no need to do so.) - -For database-related requests (@code{INSERT}, @code{UPDATE}, etc.), the -server first checks the user's global (superuser) privileges by looking in -the @code{user} table entry. If the entry allows the requested operation, -access is granted. If the global privileges in the @code{user} table are -insufficient, the server determines the user's database-specific privileges -by checking the @code{db} and @code{host} tables: - -@enumerate -@item -The server looks in the @code{db} table for a match on the @code{Host}, -@code{Db}, and @code{User} fields. The @code{Host} and @code{User} fields are -matched to the connecting user's hostname and MySQL user name. The -@code{Db} field is matched to the database the user wants to access. If -there is no entry for the @code{Host} and @code{User}, access is denied. - -@item -If there is a matching @code{db} table entry and its @code{Host} field is -not blank, that entry defines the user's database-specific privileges. - -@item -If the matching @code{db} table entry's @code{Host} field is blank, it -signifies that the @code{host} table enumerates which hosts should be allowed -access to the database. In this case, a further lookup is done in the -@code{host} table to find a match on the @code{Host} and @code{Db} fields. -If no @code{host} table entry matches, access is denied. If there is a -match, the user's database-specific privileges are computed as the -intersection (@strong{not} the union!) of the privileges in the @code{db} and -@code{host} table entries, that is, the privileges that are @code{'Y'} in both -entries. (This way you can grant general privileges in the @code{db} table -entry and then selectively restrict them on a host-by-host basis using the -@code{host} table entries.) -@end enumerate - -After determining the database-specific privileges granted by the @code{db} -and @code{host} table entries, the server adds them to the global privileges -granted by the @code{user} table. If the result allows the requested -operation, access is granted. Otherwise, the server checks the user's -table and column privileges in the @code{tables_priv} and @code{columns_priv} -tables and adds those to the user's privileges. Access is allowed or denied -based on the result. - -Expressed in boolean terms, the preceding description of how a user's -privileges are calculated may be summarised like this: - -@example -global privileges -OR (database privileges AND host privileges) -OR table privileges -OR column privileges -@end example - -It may not be apparent why, if the global @code{user} entry privileges are -initially found to be insufficient for the requested operation, the server -adds those privileges to the database-, table-, and column-specific privileges -later. The reason is that a request might require more than one type of -privilege. For example, if you execute an @code{INSERT ... SELECT} -statement, you need both @code{INSERT} and @code{SELECT} privileges. -Your privileges might be such that the @code{user} table entry grants one -privilege and the @code{db} table entry grants the other. In this case, you -have the necessary privileges to perform the request, but the server cannot -tell that from either table by itself; the privileges granted by the entries -in both tables must be combined. - -@cindex @code{host} table -@cindex tables, @code{host} - -The @code{host} table can be used to maintain a list of secure servers. - -At TcX, the @code{host} table contains a list of all machines on the local -network. These are granted all privileges. - -You can also use the @code{host} table to indicate hosts that are @strong{not} -secure. Suppose you have a machine @code{public.your.domain} that is located -in a public area that you do not consider secure. You can allow access to -all hosts on your network except that machine by using @code{host} table -entries -like this: - -@example -+--------------------+----+- -| Host | Db | ... -+--------------------+----+- -| public.your.domain | % | ... (all privileges set to 'N') -| %.your.domain | % | ... (all privileges set to 'Y') -+--------------------+----+- -@end example - -@cindex privilege, changes -@cindex changes to privileges -@cindex tables, grant -@cindex grant tables - -Naturally, you should always test your entries in the grant tables (for -example, using @code{mysqlaccess}) to make sure your access privileges are -actually set up the way you think they are. - - -@node Access denied, , Request access, Privilege system -@subsection Causes of @code{Access denied} Errors - -If you encounter @code{Access denied} errors when you try to connect to the -MySQL server, the following list indicates some courses of -action you can take to correct the problem: - -@itemize @bullet -@item -After installing MySQL, did you run the @code{mysql_install_db} -script to set up the initial grant table contents? If not, do so. -@xref{Default privileges}. Test the initial privileges by executing -this command: - -@example -shell> mysql -u root test -@end example - -The server should let you connect without error. You should also make sure -you have a file @file{user.MYD} in the MySQL database directory. -Ordinarily, this is @file{PATH/var/mysql/user.MYD}, where @code{PATH} is the -pathname to the MySQL installation root. - -@item -After a fresh installation, you should connect to the server and set up -your users and their access permissions: - -@example -shell> mysql -u root mysql -@end example - -The server should let you connect because the MySQL @code{root} user -has no password initially. That is also a security risk, so setting the -@code{root} password is something you should do while you're setting up -your other MySQL users. - -If you try to connect as @code{root} and get this error: - -@example -Access denied for user: '@@unknown' to database mysql -@end example - -this means that you don't have an entry in the @code{user} table with a -@code{User} column value of @code{'root'} and that @code{mysqld} cannot -resolve the hostname for your client. In this case, you must restart the -server with the @code{--skip-grant-tables} option and edit your -@file{/etc/hosts} or @file{\windows\hosts} file to add an entry for your -host. - -@item -If you get an error like the following: - -@example -shell> mysqladmin -u root -pxxxx ver -Access denied for user: 'root@@localhost' (Using password: YES) -@end example - -It means that you are using a wrong password. @xref{Passwords}. - -If you have forgot the root password, you can restart @code{mysqld} with -@code{--skip-grant-tables} to change the password. -@xref{Resetting permissions}. - -If you get the above error even if you haven't specified a password, -this means that you a wrong password in some @code{my.ini} -file. @xref{Option files}. You can avoid using option files with the @code{--no-defaults} option, as follows: - -@example -shell> mysqladmin --no-defaults -u root ver -@end example - -@item -@cindex @code{mysql_fix_privilege_tables} -If you updated an existing MySQL installation from a version earlier -than Version 3.22.11 to Version 3.22.11 or later, did you run the -@code{mysql_fix_privilege_tables} script? If not, do so. The structure of -the grant tables changed with MySQL Version 3.22.11 when the -@code{GRANT} statement became functional. - -@item -If your privileges seem to have changed in the middle of a session, it may be -that a superuser has changed them. Reloading the grant tables affects new -client connections, but it also affects existing connections as indicated in -@ref{Privilege changes}. - -@item -If you can't get your password to work, remember that you must use -the @code{PASSWORD()} function if you set the password with the -@code{INSERT}, @code{UPDATE}, or @code{SET PASSWORD} statements. The -@code{PASSWORD()} function is unnecessary if you specify the password using -the @code{GRANT ... INDENTIFIED BY} statement or the @code{mysqladmin -password} command. -@xref{Passwords}. - -@item -@code{localhost} is a synonym for your local hostname, and is also the -default host to which clients try to connect if you specify no host -explicitly. However, connections to @code{localhost} do not work if you are -using a MySQL version prior to 3.23.27 that uses MIT-pthreads -(@code{localhost} connections are made using Unix sockets, which were not -supported by MIT-pthreads at that time). To avoid this problem on such -systems, you should use the @code{--host} option to name -the server host explicitly. This will make a TCP/IP connection to the -@code{mysqld} server. In this case, you must have your real hostname in -@code{user} table entries on the server host. (This is true even if you are -running a client program on the same host as the server.) - -@item -If you get an @code{Access denied} error when trying to connect to the -database with @code{mysql -u user_name db_name}, you may have a problem -with the @code{user} table. Check this by executing @code{mysql -u root -mysql} and issuing this SQL statement: - -@example -mysql> SELECT * FROM user; -@end example - -The result should include an entry with the @code{Host} and @code{User} -columns matching your computer's hostname and your MySQL user name. - -@item -The @code{Access denied} error message will tell you who you are trying -to log in as, the host from which you are trying to connect, and whether -or not you were using a password. Normally, you should have one entry in -the @code{user} table that exactly matches the hostname and user name -that were given in the error message. For example if you get an error -message that contains @code{Using password: NO}, this means that you -tried to login without an password. - -@item -If you get the following error when you try to connect from a different host -than the one on which the MySQL server is running, then there is no -row in the @code{user} table that matches that host: - -@example -Host ... is not allowed to connect to this MySQL server -@end example - -You can fix this by using the command-line tool @code{mysql} (on the -server host!) to add a row to the @code{user}, @code{db}, or @code{host} -table for the user/hostname combination from which you are trying to -connect and then execute @code{mysqladmin flush-privileges}. If you are -not running MySQL Version 3.22 and you don't know the IP number or -hostname of the machine from which you are connecting, you should put an -entry with @code{'%'} as the @code{Host} column value in the @code{user} -table and restart @code{mysqld} with the @code{--log} option on the -server machine. After trying to connect from the client machine, the -information in the MySQL log will indicate how you really did -connect. (Then replace the @code{'%'} in the @code{user} table entry -with the actual hostname that shows up in the log. Otherwise, you'll -have a system that is insecure.) - -Another reason for this error on Linux is that you are using a binary -MySQL version that is compiled with a different glibc version -than the one you are using. In this case you should either upgrade your -OS/glibc or download the source MySQL version and compile this -yourself. A source RPM is normally trivial to compile and install, so -this isn't a big problem. - -@item -If you get an error message where the hostname is not shown or where the -hostname is an IP, even if you try to connect with a hostname: - -@example -shell> mysqladmin -u root -pxxxx -h some-hostname ver -Access denied for user: 'root@@' (Using password: YES) -@end example - -This means that MySQL got some error when trying to resolve the -IP to a hostname. In this case you can execute @code{mysqladmin -flush-hosts} to reset the internal DNS cache. @xref{DNS}. - -Some permanent solutions are: - -@itemize @minus -@item -Try to find out what is wrong with your DNS server and fix this. - -@item -Specify IPs instead of hostnames in the MySQL privilege tables. - -@item -Start @code{mysqld} with @code{--skip-name-resolve}. - -@item -Start @code{mysqld} with @code{--skip-host-cache}. - -@item -Connect to @code{localhost} if you are running the server and the client -on the same machine. - -@item -Put the client machine names in @code{/etc/hosts}. -@end itemize - -@item -If @code{mysql -u root test} works but @code{mysql -h your_hostname -u root -test} results in @code{Access denied}, then you may not have the correct name -for your host in the @code{user} table. A common problem here is that the -@code{Host} value in the user table entry specifies an unqualified hostname, -but your system's name resolution routines return a fully qualified domain -name (or vice-versa). For example, if you have an entry with host -@code{'tcx'} in the @code{user} table, but your DNS tells MySQL that -your hostname is @code{'tcx.subnet.se'}, the entry will not work. Try adding -an entry to the @code{user} table that contains the IP number of your host as -the @code{Host} column value. (Alternatively, you could add an entry to the -@code{user} table with a @code{Host} value that contains a wildcard---for -example, @code{'tcx.%'}. However, use of hostnames ending with @samp{%} is -@strong{insecure} and is @strong{not} recommended!) - -@item -If @code{mysql -u user_name test} works but @code{mysql -u user_name -other_db_name} doesn't work, you don't have an entry for @code{other_db_name} -listed in the @code{db} table. - -@item -If @code{mysql -u user_name db_name} works when executed on the server -machine, but @code{mysql -u host_name -u user_name db_name} doesn't work when -executed on another client machine, you don't have the client machine listed -in the @code{user} table or the @code{db} table. - -@item -If you can't figure out why you get @code{Access denied}, remove from the -@code{user} table all entries that have @code{Host} values containing -wildcards (entries that contain @samp{%} or @samp{_}). A very common error -is to insert a new entry with @code{Host}=@code{'%'} and -@code{User}=@code{'some user'}, thinking that this will allow you to specify -@code{localhost} to connect from the same machine. The reason that this -doesn't work is that the default privileges include an entry with -@code{Host}=@code{'localhost'} and @code{User}=@code{''}. Because that entry -has a @code{Host} value @code{'localhost'} that is more specific than -@code{'%'}, it is used in preference to the new entry when connecting from -@code{localhost}! The correct procedure is to insert a second entry with -@code{Host}=@code{'localhost'} and @code{User}=@code{'some_user'}, or to -remove the entry with @code{Host}=@code{'localhost'} and -@code{User}=@code{''}. - -@item -If you get the following error, you may have a problem with the @code{db} or -@code{host} table: - -@example -Access to database denied -@end example - -If the entry selected from the @code{db} table has an empty value in the -@code{Host} column, make sure there are one or more corresponding entries in -the @code{host} table specifying which hosts the @code{db} table entry -applies to. - -If you get the error when using the SQL commands @code{SELECT ... -INTO OUTFILE} or @code{LOAD DATA INFILE}, your entry in the @code{user} table -probably doesn't have the @code{FILE} privilege enabled. - -@item -@cindex configuration files -@cindex environment variables -@tindex .my.cnf file -Remember that client programs will use connection parameters specified -in configuration files or environment variables. @xref{Environment -variables}. If a client seems to be sending the wrong default -connection parameters when you don't specify them on the command-line, -check your environment and the @file{.my.cnf} file in your home -directory. You might also check the system-wide MySQL -configuration files, though it is far less likely that client connection -parameters will be specified there. @xref{Option files}. If you get -@code{Access denied} when you run a client without any options, make -sure you haven't specified an old password in any of your option files! -@xref{Option files}. - -@item -If you make changes to the grant tables directly (using an @code{INSERT} or -@code{UPDATE} statement) and your changes seem to be ignored, remember -that you must issue a @code{FLUSH PRIVILEGES} statement or execute a -@code{mysqladmin flush-privileges} command to cause the server to re-read -the privilege tables. Otherwise, your changes have no effect until the -next time the server is restarted. Remember that after you set the -@code{root} password with an @code{UPDATE} command, you won't need to -specify it until after you flush the privileges, because the server -won't know you've changed the password yet! - -@item -If you have access problems with a Perl, PHP, Python, or ODBC program, try to -connect to the server with @code{mysql -u user_name db_name} or @code{mysql --u user_name -pyour_pass db_name}. If you are able to connect using the -@code{mysql} client, there is a problem with your program and not with the -access privileges. (Note that there is no space between @code{-p} and the -password; you can also use the @code{--password=your_pass} syntax to specify -the password. If you use the @code{-p} option alone, MySQL will -prompt you for the password.) - -@item -For testing, start the @code{mysqld} daemon with the -@code{--skip-grant-tables} option. Then you can change the MySQL -grant tables and use the @code{mysqlaccess} script to check whether -your modifications have the desired effect. When you are satisfied with your -changes, execute @code{mysqladmin flush-privileges} to tell the @code{mysqld} -server to start using the new grant tables. @strong{Note}: reloading the -grant tables overrides the @code{--skip-grant-tables} option. This allows -you to tell the server to begin using the grant tables again without bringing -it down and restarting it. - -@item -If everything else fails, start the @code{mysqld} daemon with a debugging -option (for example, @code{--debug=d,general,query}). This will print host and -user information about attempted connections, as well as information about -each command issued. @xref{Making trace files}. - -@item -If you have any other problems with the MySQL grant tables and -feel you must post the problem to the mailing list, always provide a -dump of the MySQL grant tables. You can dump the tables with -the @code{mysqldump mysql} command. As always, post your problem using -the @code{mysqlbug} script. @xref{Bug reports}. In some cases you may need -to restart @code{mysqld} with @code{--skip-grant-tables} to run -@code{mysqldump}. -@end itemize - - -@node User Account Management, Disaster Prevention, Privilege system, MySQL Database Administration -@section MySQL User Account Management - -@c FIX: add section intro - -@menu -* GRANT:: @code{GRANT} and @code{REVOKE} Syntax -* User names:: MySQL User Names and Passwords -* Privilege changes:: When Privilege Changes Take Effect -* Default privileges:: Setting Up the Initial MySQL Privileges -* Adding users:: Adding New Users to MySQL -* User resources:: Limiting user resources -* Passwords:: Setting Up Passwords -* Password security:: Keeping Your Password Secure -* Secure connections:: Using Secure Connections -@end menu - - -@node GRANT, User names, User Account Management, User Account Management -@subsection @code{GRANT} and @code{REVOKE} Syntax - -@findex GRANT -@findex REVOKE - -@cindex privileges, granting -@cindex privileges, revoking -@cindex global privileges -@cindex revoking, privleges -@cindex granting, privleges - -@example -GRANT priv_type [(column_list)] [, priv_type [(column_list)] ...] - ON @{tbl_name | * | *.* | db_name.*@} - TO user_name [IDENTIFIED BY [PASSWORD] 'password'] - [, user_name [IDENTIFIED BY 'password'] ...] - [REQUIRE - NONE | - [@{SSL| X509@}] - [CIPHER cipher [AND]] - [ISSUER issuer [AND]] - [SUBJECT subject]] - [WITH [GRANT OPTION | MAX_QUERIES_PER_HOUR # | - MAX_UPDATES_PER_HOUR # | - MAX_CONNECTIONS_PER_HOUR #]] - -REVOKE priv_type [(column_list)] [, priv_type [(column_list)] ...] - ON @{tbl_name | * | *.* | db_name.*@} - FROM user_name [, user_name ...] -@end example - -@code{GRANT} is implemented in MySQL Version 3.22.11 or later. For -earlier MySQL versions, the @code{GRANT} statement does nothing. - -The @code{GRANT} and @code{REVOKE} commands allow system administrators -to create users and grant and revoke rights to MySQL users at -four privilege levels: - -@table @strong -@item Global level -Global privileges apply to all databases on a given server. These privileges -are stored in the @code{mysql.user} table. - -@item Database level -Database privileges apply to all tables in a given database. These privileges -are stored in the @code{mysql.db} and @code{mysql.host} tables. - -@item Table level -Table privileges apply to all columns in a given table. These privileges are -stored in the @code{mysql.tables_priv} table. - -@item Column level -Column privileges apply to single columns in a given table. These privileges are -stored in the @code{mysql.columns_priv} table. -@end table - -If you give a grant for a users that doesn't exists, that user is created. -For examples of how @code{GRANT} works, see @ref{Adding users}. - -For the @code{GRANT} and @code{REVOKE} statements, @code{priv_type} may be -specified as any of the following: - -@c FIX agl 2002-06-13 New table, need to measure colwidths! -@multitable @columnfractions .30 .70 -@item @code{ALL [PRIVILEGES]} @tab Sets all simple privileges except @code{WITH GRANT OPTION} -@item @code{ALTER} @tab Allows usage of @code{ALTER TABLE} -@item @code{CREATE} @tab Allows usage of @code{CREATE TABLE} -@item @code{CREATE TEMPORARY TABLES} @tab Allows usage of @code{CREATE TEMPORARY TABLE} -@item @code{DELETE} @tab Allows usage of @code{DELETE} -@item @code{DROP} @tab Allows usage of @code{DROP TABLE}. -@item @code{EXECUTE} @tab Allows the user to run stored procedures (for MySQL 5.0) -@item @code{FILE} @tab Allows usage of @code{SELECT ... INTO OUTFILE} and @code{LOAD DATA INFILE}. -@item @code{INDEX} @tab Allows usage of @code{CREATE INDEX} and @code{DROP INDEX} -@item @code{INSERT} @tab Allows usage of @code{INSERT} -@item @code{LOCK TABLES} @tab Allows usage of @code{LOCK TABLES} on tables for which on has the @code{SELECT} privilege. -@item @code{PROCESS} @tab Allows usage of @code{SHOW FULL PROCESSLIST} -@item @code{REFERENCES} @tab For the future -@item @code{RELOAD} @tab Allows usage of @code{FLUSH} -@item @code{REPLICATION CLIENT} @tab Gives the right to the user to ask where the slaves/masters are. -@item @code{REPLICATION SLAVE} @tab Needed for the replication slaves (to read binlogs from master). -@item @code{SELECT} @tab Allows usage of @code{SELECT} -@item @code{SHOW DATABASES} @tab @code{SHOW DATABASES} shows all databases. -@item @code{SHUTDOWN} @tab Allows usage of @code{mysqladmin shutdown} -@item @code{SUPER} @tab Allows one connect (once) even if max_connections is reached and execute commands @code{CHANGE MASTER}, @code{KILL thread}, @code{mysqladmin debug}, @code{PURGE MASTER LOGS} and @code{SET GLOBAL} -@item @code{UPDATE} @tab Allows usage of @code{UPDATE} -@item @code{USAGE} @tab Synonym for ``no privileges.'' -@end multitable - -@code{USAGE} can be used when you want to create a user that has no privileges. - -The privileges @code{CREATE TEMPORARY TABLES}, @code{EXECUTE}, -@code{LOCK TABLES}, @code{REPLICATION ...}, @code{SHOW DATABASES} and -@code{SUPER} are new for in version 4.0.2. To use these new privileges -after upgrading to 4.0.2, you have to run the -@code{mysql_fix_privilege_tables} script. - -In older MySQL versions, the @code{PROCESS} privilege gives the same -rights as the new @code{SUPER} privilege. - -To revoke the @code{GRANT} privilege from a user, use a @code{priv_type} -value of @code{GRANT OPTION}: - -@example -mysql> REVOKE GRANT OPTION ON ... FROM ...; -@end example - -The only @code{priv_type} values you can specify for a table are @code{SELECT}, -@code{INSERT}, @code{UPDATE}, @code{DELETE}, @code{CREATE}, @code{DROP}, -@code{GRANT}, @code{INDEX}, and @code{ALTER}. - -The only @code{priv_type} values you can specify for a column (that is, when -you use a @code{column_list} clause) are @code{SELECT}, @code{INSERT}, and -@code{UPDATE}. - -You can set global privileges by using @code{ON *.*} syntax. You can set -database privileges by using @code{ON db_name.*} syntax. If you specify -@code{ON *} and you have a current database, you will set the privileges for -that database. (@strong{Warning}: if you specify @code{ON *} and you -@strong{don't} have a current database, you will affect the global privileges!) - -@strong{Please note}: the @samp{_} and @samp{%} wildcards are allowed when -specifying database names in @code{GRANT} commands. This means that if you -wish to use for instance a @samp{_} character as part of a database name, -you should specify it as @samp{\_} in the @code{GRANT} command, to prevent -the user from being able to access additional databases matching the -wildcard pattern, e.g., @code{GRANT ... ON `foo\_bar`.* TO ...}. - -In order to accommodate granting rights to users from arbitrary hosts, -MySQL supports specifying the @code{user_name} value in the form -@code{user@@host}. If you want to specify a @code{user} string -containing special characters (such as @samp{-}), or a @code{host} string -containing special characters or wildcard characters (such as @samp{%}), you -can quote the user or host name (for example, @code{'test-user'@@'test-hostname'}). - -You can specify wildcards in the hostname. For example, -@code{user@@'%.loc.gov'} applies to @code{user} for any host in the -@code{loc.gov} domain, and @code{user@@'144.155.166.%'} applies to @code{user} -for any host in the @code{144.155.166} class C subnet. - -The simple form @code{user} is a synonym for @code{user@@"%"}. - -MySQL doesn't support wildcards in user names. Anonymous users are -defined by inserting entries with @code{User=''} into the -@code{mysql.user} table or creating an user with an empty name with the -@code{GRANT} command. - -@strong{Note}: if you allow anonymous users to connect to the MySQL -server, you should also grant privileges to all local users as -@code{user@@localhost} because otherwise the anonymous user entry for -the local host in the @code{mysql.user} table will be used when the user -tries to log into the MySQL server from the local machine! - -You can verify if this applies to you by executing this query: - -@example -mysql> SELECT Host,User FROM mysql.user WHERE User=''; -@end example - -For the moment, @code{GRANT} only supports host, table, database, and -column names up to 60 characters long. A user name can be up to 16 -characters. - -The privileges for a table or column are formed from the -logical OR of the privileges at each of the four privilege -levels. For example, if the @code{mysql.user} table specifies that a -user has a global @code{SELECT} privilege, this can't be denied by an -entry at the database, table, or column level. - -The privileges for a column can be calculated as follows: - -@example -global privileges -OR (database privileges AND host privileges) -OR table privileges -OR column privileges -@end example - -In most cases, you grant rights to a user at only one of the privilege -levels, so life isn't normally as complicated as above. The details of the -privilege-checking procedure are presented in -@ref{Privilege system}. - -If you grant privileges for a user/hostname combination that does not exist -in the @code{mysql.user} table, an entry is added and remains there until -deleted with a @code{DELETE} command. In other words, @code{GRANT} may -create @code{user} table entries, but @code{REVOKE} will not remove them; -you must do that explicitly using @code{DELETE}. - -@cindex passwords, setting -In MySQL Version 3.22.12 or later, -if a new user is created or if you have global grant privileges, the user's -password will be set to the password specified by the @code{IDENTIFIED BY} -clause, if one is given. If the user already had a password, it is replaced -by the new one. - -If you don't want to send the password in clear text you can use the -@code{PASSWORD} option followed by a scrambled password from SQL -function @code{PASSWORD()} or the C API function -@code{make_scrambled_password(char *to, const char *password)}. - -@strong{Warning}: if you create a new user but do not specify an -@code{IDENTIFIED BY} clause, the user has no password. This is insecure. - -Passwords can also be set with the @code{SET PASSWORD} command. -@xref{SET OPTION, , @code{SET}}. - -If you grant privileges for a database, an entry in the @code{mysql.db} -table is created if needed. When all privileges for the database have been -removed with @code{REVOKE}, this entry is deleted. - -If a user doesn't have any privileges on a table, the table is not displayed -when the user requests a list of tables (for example, with a @code{SHOW TABLES} -statement). - -The @code{WITH GRANT OPTION} clause gives the user the ability to give -to other users any privileges the user has at the specified privilege level. -You should be careful to whom you give the @code{GRANT} privilege, as two -users with different privileges may be able to join privileges! - -@code{MAX_QUERIES_PER_HOUR #}, @code{MAX_UPDATES_PER_HOUR #} and -@code{MAX_CONNECTIONS_PER_HOUR #} are new in MySQL version 4.0.2. -These options limit the number of queries/updates and logins the user can -do during one hour. If @code{#} is 0 (default), then this means that there -are no limitations for that user. @xref{User resources}. - -You cannot grant another user a privilege you don't have yourself; -the @code{GRANT} privilege allows you to give away only those privileges -you possess. - -Be aware that when you grant a user the @code{GRANT} privilege at a -particular privilege level, any privileges the user already possesses (or -is given in the future!) at that level are also grantable by that user. -Suppose you grant a user the @code{INSERT} privilege on a database. If -you then grant the @code{SELECT} privilege on the database and specify -@code{WITH GRANT OPTION}, the user can give away not only the @code{SELECT} -privilege, but also @code{INSERT}. If you then grant the @code{UPDATE} -privilege to the user on the database, the user can give away the -@code{INSERT}, @code{SELECT} and @code{UPDATE}. - -You should not grant @code{ALTER} privileges to a normal user. If you -do that, the user can try to subvert the privilege system by renaming -tables! - -Note that if you are using table or column privileges for even one user, the -server examines table and column privileges for all users and this will slow -down MySQL a bit. - -When @code{mysqld} starts, all privileges are read into memory. -Database, table, and column privileges take effect at once, and -user-level privileges take effect the next time the user connects. -Modifications to the grant tables that you perform using @code{GRANT} or -@code{REVOKE} are noticed by the server immediately. -If you modify the grant tables manually (using @code{INSERT}, @code{UPDATE}, -etc.), you should execute a @code{FLUSH PRIVILEGES} statement or run -@code{mysqladmin flush-privileges} to tell the server to reload the grant -tables. -@xref{Privilege changes}. - -@cindex ANSI SQL, differences from -The biggest differences between the ANSI SQL and MySQL versions of -@code{GRANT} are: - -@itemize @bullet -@item -In MySQL privileges are given for an username + hostname combination -and not only for an username. - -@item -ANSI SQL doesn't have global or database-level privileges, and ANSI SQL -doesn't support all privilege types that MySQL supports. -MySQL doesn't support the ANSI SQL @code{TRIGGER} or @code{UNDER} -privileges. - -@item -ANSI SQL privileges are structured in a hierarchal manner. If you remove -an user, all privileges the user has granted are revoked. In -MySQL the granted privileges are not automatically revoked, but -you have to revoke these yourself if needed. - -@item -In MySQL, if you have the @code{INSERT} privilege on only some of the -columns in a table, you can execute @code{INSERT} statements on the -table; the columns for which you don't have the @code{INSERT} privilege -will be set to their default values. ANSI SQL requires you to have the -@code{INSERT} privilege on all columns. - -@item -When you drop a table in ANSI SQL, all privileges for the table are revoked. -If you revoke a privilege in ANSI SQL, all privileges that were granted based -on this privilege are also revoked. In MySQL, privileges can be -dropped only with explicit @code{REVOKE} commands or by manipulating the -MySQL grant tables. -@end itemize - -For a description of using @code{REQUIRE}, see @ref{Secure connections}. - -@node User names, Privilege changes, GRANT, User Account Management -@subsection MySQL User Names and Passwords - -@cindex user names, and passwords -@cindex passwords, for users - -There are several distinctions between the way user names and passwords are -used by MySQL and the way they are used by Unix or Windows: - -@itemize @bullet -@item -User names, as used by MySQL for authentication purposes, have -nothing to do with Unix user names (login names) or Windows user names. Most -MySQL clients by default try to log in using the current Unix user -name as the MySQL user name, but that is for convenience only. -Client programs allow a different name to be specified with the @code{-u} or -@code{--user} options. This means that you can't make a database secure in -any way unless all MySQL user names have passwords. Anyone may -attempt to connect to the server using any name, and they will succeed if -they specify any name that doesn't have a password. - -@item -MySQL user names can be up to 16 characters long; Unix user names -typically are limited to 8 characters. - -@item -MySQL passwords have nothing to do with Unix passwords. There is no -necessary connection between the password you use to log in to a Unix machine -and the password you use to access a database on that machine. - -@item -MySQL encrypts passwords using a different algorithm than the -one used during the Unix login process. See the descriptions of the -@code{PASSWORD()} and @code{ENCRYPT()} functions in @ref{Miscellaneous -functions}. Note that even if the password is stored 'scrambled', and -knowing your 'scrambled' password is enough to be able to connect to -the MySQL server! -@end itemize - -MySQL users and their privileges are normally created with the -@code{GRANT} command. @xref{GRANT}. - -When you login to a MySQL server with a command-line client you -should specify the password with @code{--password=your-password}. -@xref{Connecting}. - -@example -mysql --user=monty --password=guess database_name -@end example - -If you want the client to prompt for a password, you should use -@code{--password} without any argument - -@example -mysql --user=monty --password database_name -@end example - -or the short form: - -@example -mysql -u monty -p database_name -@end example - -Note that in the last example the password is @strong{not} 'database_name'. - -If you want to use the @code{-p} option to supply a password you should do so -like this: - -@example -mysql -u monty -pguess database_name -@end example - -On some systems, the library call that MySQL uses to prompt for a -password will automatically cut the password to 8 characters. Internally -MySQL doesn't have any limit for the length of the password. - - -@node Privilege changes, Default privileges, User names, User Account Management -@subsection When Privilege Changes Take Effect - -When @code{mysqld} starts, all grant table contents are read into memory and -become effective at that point. - -Modifications to the grant tables that you perform using @code{GRANT}, -@code{REVOKE}, or @code{SET PASSWORD} are noticed by the server immediately. - -If you modify the grant tables manually (using @code{INSERT}, @code{UPDATE}, -etc.), you should execute a @code{FLUSH PRIVILEGES} statement or run -@code{mysqladmin flush-privileges} or @code{mysqladmin reload} to tell the -server to reload the grant tables. Otherwise, your changes will have @emph{no -effect} until you restart the server. If you change the grant tables manually -but forget to reload the privileges, you will be wondering why your changes -don't seem to make any difference! - -When the server notices that the grant tables have been changed, -existing client connections are affected as follows: - -@itemize @bullet -@item -Table and column privilege changes take effect with the client's next -request. - -@item -Database privilege changes take effect at the next @code{USE db_name} -command. - -@item -Global privilege changes and password changes take effect the next time -the client connects. -@end itemize - - -@node Default privileges, Adding users, Privilege changes, User Account Management -@subsection Setting Up the Initial MySQL Privileges - -@cindex privileges, default -@cindex default, privileges -@cindex root password -@cindex superuser -@cindex users, root -@cindex anonymous user -@cindex password, root user - -After installing MySQL, you set up the initial access privileges by -running @code{scripts/mysql_install_db}. -@xref{Quick install}. -The @code{mysql_install_db} script starts up the @code{mysqld} -server, then initialises the grant tables to contain the following set -of privileges: - -@itemize @bullet -@item -The MySQL @code{root} user is created as a superuser who can do -anything. Connections must be made from the local host. - -@strong{Note}: -The initial @code{root} password is empty, so anyone can connect as @code{root} -@emph{without a password} and be granted all privileges. - -@item -@cindex anonymous user -An anonymous user is created that can do anything with databases that have a -name of @code{'test'} or starting with @code{'test_'}. Connections must be -made from the local host. This means any local user can connect without a -password and be treated as the anonymous user. - -@item -Other privileges are denied. For example, normal users can't use -@code{mysqladmin shutdown} or @code{mysqladmin processlist}. -@end itemize - -@strong{Note}: the default privileges are different for Windows. -@xref{Windows running}. - -Because your installation is initially wide open, one of the first things you -should do is specify a password for the MySQL -@code{root} user. You can do this as follows (note that you specify the -password using the @code{PASSWORD()} function): - -@example -shell> mysql -u root mysql -mysql> SET PASSWORD FOR root@@localhost=PASSWORD('new_password'); -@end example - -If you know what you are doing, you can also directly manipulate the -privilege tables: - -@example -shell> mysql -u root mysql -mysql> UPDATE user SET Password=PASSWORD('new_password') - -> WHERE user='root'; -mysql> FLUSH PRIVILEGES; -@end example - -Another way to set the password is by using the @code{mysqladmin} command: - -@example -shell> mysqladmin -u root password new_password -@end example - -Only users with write/update access to the @code{mysql} database can change the -password for others users. All normal users (not anonymous ones) can only -change their own password with either of the above commands or with -@code{SET PASSWORD=PASSWORD('new password')}. - -Note that if you update the password in the @code{user} table directly using -the first method, you must tell the server to re-read the grant tables (with -@code{FLUSH PRIVILEGES}), because the change will go unnoticed otherwise. - -Once the @code{root} password has been set, thereafter you must supply that -password when you connect to the server as @code{root}. - -You may wish to leave the @code{root} password blank so that you don't need -to specify it while you perform additional setup or testing. However, be sure -to set it before using your installation for any real production work. - -See the @code{scripts/mysql_install_db} script to see how it sets up -the default privileges. You can use this as a basis to see how to -add other users. - -If you want the initial privileges to be different from those just described -above, you can modify @code{mysql_install_db} before you run it. - -@cindex grant tables, re-creating -@cindex re-creating, grant tables -To re-create the grant tables completely, remove all the @file{.frm}, -@file{.MYI}, and @file{.MYD} files in the directory containing the -@code{mysql} database. (This is the directory named @file{mysql} under -the database directory, which is listed when you run @code{mysqld ---help}.) Then run the @code{mysql_install_db} script, possibly after -editing it first to have the privileges you want. - -@strong{Note}: for MySQL versions older than Version 3.22.10, -you should not delete the @file{.frm} files. If you accidentally do this, -you should copy them back from your MySQL distribution before -running @code{mysql_install_db}. - - -@node Adding users, User resources, Default privileges, User Account Management -@subsection Adding New Users to MySQL - -@findex GRANT statement -@findex statements, GRANT - -@cindex privileges, adding -@cindex adding, new user privileges -@cindex user privileges, adding - -You can add users two different ways: by using @code{GRANT} statements -or by manipulating the MySQL grant tables directly. The -preferred method is to use @code{GRANT} statements, because they are -more concise and less error-prone. @xref{GRANT}. - -There are also a lot of contributed programs like @code{phpmyadmin} -that can be used to create and administrate users. @xref{Portals}. - -The following examples show how to use the @code{mysql} client to set up new -users. These examples assume that privileges are set up according to the -defaults described in the previous section. This means that to make changes, -you must be on the same machine where @code{mysqld} is running, you must -connect as the MySQL @code{root} user, and the @code{root} user must -have the @code{INSERT} privilege for the @code{mysql} database and the -@code{RELOAD} administrative privilege. Also, if you have changed the -@code{root} user password, you must specify it for the @code{mysql} commands here. - -You can add new users by issuing @code{GRANT} statements: - -@example -shell> mysql --user=root mysql -mysql> GRANT ALL PRIVILEGES ON *.* TO monty@@localhost - -> IDENTIFIED BY 'some_pass' WITH GRANT OPTION; -mysql> GRANT ALL PRIVILEGES ON *.* TO monty@@"%" - -> IDENTIFIED BY 'some_pass' WITH GRANT OPTION; -mysql> GRANT RELOAD,PROCESS ON *.* TO admin@@localhost; -mysql> GRANT USAGE ON *.* TO dummy@@localhost; -@end example - -These @code{GRANT} statements set up three new users: - -@table @code -@item monty -A full superuser who can connect to the server from anywhere, but who must -use a password @code{'some_pass'} to do so. Note that we must issue -@code{GRANT} statements for both @code{monty@@localhost} and -@code{monty@@"%"}. If we don't add the entry with @code{localhost}, the -anonymous user entry for @code{localhost} that is created by -@code{mysql_install_db} will take precedence when we connect from the local -host, because it has a more specific @code{Host} field value and thus comes -earlier in the @code{user} table sort order. - -@item admin -A user who can connect from @code{localhost} without a password and who is -granted the @code{RELOAD} and @code{PROCESS} administrative privileges. -This allows the user to execute the @code{mysqladmin reload}, -@code{mysqladmin refresh}, and @code{mysqladmin flush-*} commands, as well as -@code{mysqladmin processlist} . No database-related privileges are granted. -(They can be granted later by issuing additional @code{GRANT} statements.) - -@item dummy -A user who can connect without a password, but only from the local host. The -global privileges are all set to @code{'N'}@-the @code{USAGE} privilege -type allows you to create a user with no privileges. It is assumed that you -will grant database-specific privileges later. -@end table - -@findex INSERT statement, grant privileges -@findex statements, INSERT -You can also add the same user access information directly by issuing -@code{INSERT} statements and then telling the server to reload the grant -tables: - -@example -shell> mysql --user=root mysql -mysql> INSERT INTO user VALUES('localhost','monty',PASSWORD('some_pass'), - -> 'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y'); -mysql> INSERT INTO user VALUES('%','monty',PASSWORD('some_pass'), - -> 'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y'); -mysql> INSERT INTO user SET Host='localhost',User='admin', - -> Reload_priv='Y', Process_priv='Y'; -mysql> INSERT INTO user (Host,User,Password) - -> VALUES('localhost','dummy',''); -mysql> FLUSH PRIVILEGES; -@end example - -Depending on your MySQL version, you may have to use a different -number of @code{'Y'} values above (versions prior to Version 3.22.11 had fewer -privilege columns). For the @code{admin} user, the more readable extended -@code{INSERT} syntax that is available starting with Version 3.22.11 is used. - -Note that to set up a superuser, you need only create a @code{user} table -entry with the privilege fields set to @code{'Y'}. No @code{db} or -@code{host} table entries are necessary. - -The privilege columns in the @code{user} table were not set explicitly in the -last @code{INSERT} statement (for the @code{dummy} user), so those columns -are assigned the default value of @code{'N'}. This is the same thing that -@code{GRANT USAGE} does. - -The following example adds a user @code{custom} who can connect from hosts -@code{localhost}, @code{server.domain}, and @code{whitehouse.gov}. He wants -to access the @code{bankaccount} database only from @code{localhost}, -the @code{expenses} database only from @code{whitehouse.gov}, and -the @code{customer} database from all three hosts. He wants -to use the password @code{stupid} from all three hosts. - -To set up this user's privileges using @code{GRANT} statements, run these -commands: - -@example -shell> mysql --user=root mysql -mysql> GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP - -> ON bankaccount.* - -> TO custom@@localhost - -> IDENTIFIED BY 'stupid'; -mysql> GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP - -> ON expenses.* - -> TO custom@@whitehouse.gov - -> IDENTIFIED BY 'stupid'; -mysql> GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP - -> ON customer.* - -> TO custom@@'%' - -> IDENTIFIED BY 'stupid'; -@end example - -The reason that we do to grant statements for the user 'custom' is that -we want the give the user access to MySQL both from the local -machine with Unix sockets and from the remote machine 'whitehouse.gov' -over TCP/IP. - -To set up the user's privileges by modifying the grant tables directly, -run these commands (note the @code{FLUSH PRIVILEGES} at the end): - -@example -shell> mysql --user=root mysql -mysql> INSERT INTO user (Host,User,Password) - -> VALUES('localhost','custom',PASSWORD('stupid')); -mysql> INSERT INTO user (Host,User,Password) - -> VALUES('server.domain','custom',PASSWORD('stupid')); -mysql> INSERT INTO user (Host,User,Password) - -> VALUES('whitehouse.gov','custom',PASSWORD('stupid')); -mysql> INSERT INTO db - -> (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv, - -> Create_priv,Drop_priv) - -> VALUES - -> ('localhost','bankaccount','custom','Y','Y','Y','Y','Y','Y'); -mysql> INSERT INTO db - -> (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv, - -> Create_priv,Drop_priv) - -> VALUES - -> ('whitehouse.gov','expenses','custom','Y','Y','Y','Y','Y','Y'); -mysql> INSERT INTO db - -> (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv, - -> Create_priv,Drop_priv) - -> VALUES('%','customer','custom','Y','Y','Y','Y','Y','Y'); -mysql> FLUSH PRIVILEGES; -@end example - -The first three @code{INSERT} statements add @code{user} table entries that -allow user @code{custom} to connect from the various hosts with the given -password, but grant no permissions to him (all privileges are set to the -default value of @code{'N'}). The next three @code{INSERT} statements add -@code{db} table entries that grant privileges to @code{custom} for the -@code{bankaccount}, @code{expenses}, and @code{customer} databases, but only -when accessed from the proper hosts. As usual, when the grant tables are -modified directly, the server must be told to reload them (with -@code{FLUSH PRIVILEGES}) so that the privilege changes take effect. - -If you want to give a specific user access from any machine in a given -domain, you can issue a @code{GRANT} statement like the following: - -@example -mysql> GRANT ... - -> ON *.* - -> TO myusername@@"%.mydomainname.com" - -> IDENTIFIED BY 'mypassword'; -@end example - -To do the same thing by modifying the grant tables directly, do this: - -@example -mysql> INSERT INTO user VALUES ('%.mydomainname.com', 'myusername', - -> PASSWORD('mypassword'),...); -mysql> FLUSH PRIVILEGES; -@end example - -You can also use @code{xmysqladmin}, @code{mysql_webadmin}, and even -@code{xmysql} to insert, change, and update values in the grant tables. -You can find these utilities in the Contrib directory of the -MySQL web site (@uref{http://www.mysql.com/Downloads/Contrib/}). - -@node User resources, Passwords, Adding users, User Account Management -@subsection Limiting user resources - -Starting from MySQL 4.0.2 one can limit certain resources per user. - -So far, the only available method of limiting usage of MySQL -server resources has been setting the @code{max_user_connections} -startup variable to a non-zero value. But this method is strictly -global and does not allow for management of individual users, which -could be of particular interest to Internet Service Providers. - -Therefore, management of three resources is introduced on the -individual user level: - -@itemize @bullet -@item Number of all queries per hour: -All commands that could be run by a user. -@item Number of all updates per hour: -Any command that changes any table or database. -@item Number of connections made per hour: -New connections opened per hour. -@end itemize - -A user in the aforementioned context is a single entry in the -@code{user} table, which is uniquely identified by its @code{user} -and @code{host} columns. - -All users are by default not limited in using the above resources, -unless the limits are granted to them. These limits can be granted -@strong{only} via global @code{GRANT (*.*)}, using this syntax: - -@example -GRANT ... WITH MAX_QUERIES_PER_HOUR N1 - MAX_UPDATES_PER_HOUR N2 - MAX_CONNECTIONS_PER_HOUR N3; -@end example - -One can specify any combination of the above resources. -N1, N2 and N3 are integers and stands for count / hour. - -If user reaches any of the above limits withing one hour, his -connection will be terminated or refused and the appropriate error -message shall be issued. - -Current usage values for a particular user can be flushed (set to zero) -by issuing a @code{GRANT} statement with any of the above clauses, -including a @code{GRANT} statement with the current values. - -Also, current values for all users will be flushed if privileges are -reloaded (in the server or using @code{mysqladmin reload}) -or if the @code{FLUSH USER_RESOURCES} command is issued. - -The feature is enabled as soon as a single user is granted with any -of the limiting @code{GRANT} clauses. - -As a prerequisite for enabling this feature, the @code{user} table in -the @code{mysql} database must contain the additional columns, as -defined in the table creation scripts @code{mysql_install_db} and -@code{mysql_install_db.sh} in @file{scripts} subdirectory. - -@node Passwords, Password security, User resources, User Account Management -@subsection Setting Up Passwords - -@findex PASSWORD() -@findex SET PASSWORD statement - -@cindex passwords, setting -@cindex setting, passwords - -In most cases you should use @code{GRANT} to set up your users/passwords, -so the following only applies for advanced users. @xref{GRANT, , @code{GRANT}}. - -The examples in the preceding sections illustrate an important principle: -when you store a non-empty password using @code{INSERT} or @code{UPDATE} -statements, you must use the @code{PASSWORD()} function to encrypt it. This -is because the @code{user} table stores passwords in encrypted form, not as -plaintext. If you forget that fact, you are likely to attempt to set -passwords like this: - -@example -shell> mysql -u root mysql -mysql> INSERT INTO user (Host,User,Password) - -> VALUES('%','jeffrey','biscuit'); -mysql> FLUSH PRIVILEGES; -@end example - -The result is that the plaintext value @code{'biscuit'} is stored as the -password in the @code{user} table. When the user @code{jeffrey} attempts to -connect to the server using this password, the @code{mysql} client encrypts -it with @code{PASSWORD()}, generates an authentification vector -based on @strong{encrypted} password and a random number, -obtained from server, and sends the result to the server. -The server uses the @code{password} value in the @code{user} table -(that is @strong{not encrypted} value @code{'biscuit'}) -to perform the same calculations, and compares results. -The comparison fails and the server rejects the -connection: - -@example -shell> mysql -u jeffrey -pbiscuit test -Access denied -@end example - -Passwords must be encrypted when they are inserted in the @code{user} -table, so the @code{INSERT} statement should have been specified like this -instead: - -@example -mysql> INSERT INTO user (Host,User,Password) - -> VALUES('%','jeffrey',PASSWORD('biscuit')); -@end example - -You must also use the @code{PASSWORD()} function when you use @code{SET -PASSWORD} statements: - -@example -mysql> SET PASSWORD FOR jeffrey@@"%" = PASSWORD('biscuit'); -@end example - -If you set passwords using the @code{GRANT ... IDENTIFIED BY} statement -or the @code{mysqladmin password} command, the @code{PASSWORD()} function -is unnecessary. They both take care of encrypting the password for you, -so you would specify a password of @code{'biscuit'} like this: - -@example -mysql> GRANT USAGE ON *.* TO jeffrey@@"%" IDENTIFIED BY 'biscuit'; -@end example - -or - -@example -shell> mysqladmin -u jeffrey password biscuit -@end example - -@strong{Note}: @code{PASSWORD()} does not perform password encryption in the -same way that Unix passwords are encrypted. You should not assume that if -your Unix password and your MySQL password are the same, that -@code{PASSWORD()} will result in the same encrypted value as is stored in the -Unix password file. @xref{User names}. - - -@node Password security, Secure connections, Passwords, User Account Management -@subsection Keeping Your Password Secure - -It is inadvisable to specify your password in a way that exposes it to -discovery by other users. The methods you can use to specify your password -when you run client programs are listed here, along with an assessment of -the risks of each method: - -@itemize @bullet -@item -Never give a normal user access to the @code{mysql.user} table. Knowing -the encrypted password for a user makes it possible to login as this -user. The passwords are only scrambled so that one shouldn't be able to -see the real password you used (if you happen to use a similar password -with your other applications). - -@item -Use a @code{-pyour_pass} or @code{--password=your_pass} option on the command -line. This is convenient but insecure, because your password becomes visible -to system status programs (such as @code{ps}) that may be invoked by other -users to display command-lines. (MySQL clients typically overwrite -the command-line argument with zeroes during their initialisation sequence, -but there is still a brief interval during which the value is visible.) - -@item -Use a @code{-p} or @code{--password} option (with no @code{your_pass} value -specified). In this case, the client program solicits the password from -the terminal: -@findex -p option -@findex -password option - -@example -shell> mysql -u user_name -p -Enter password: ******** -@end example - -The @samp{*} characters represent your password. - -It is more secure to enter your password this way than to specify it on the -command-line because it is not visible to other users. However, this method -of entering a password is suitable only for programs that you run -interactively. If you want to invoke a client from a script that runs -non-interactively, there is no opportunity to enter the password from the -terminal. On some systems, you may even find that the first line of your -script is read and interpreted (incorrectly) as your password! - -@item -@tindex .my.cnf file -Store your password in a configuration file. For example, you can list your -password in the @code{[client]} section of the @file{.my.cnf} file in your -home directory: - -@example -[client] -password=your_pass -@end example - -If you store your password in @file{.my.cnf}, the file should not be group or -world readable or writable. Make sure the file's access mode is @code{400} -or @code{600}. - -@xref{Option files}. -@item -You can store your password in the @code{MYSQL_PWD} environment variable, but -this method must be considered extremely insecure and should not be used. -Some versions of @code{ps} include an option to display the environment of -running processes; your password will be in plain sight for all to see if -you set @code{MYSQL_PWD}. Even on systems without such a version of -@code{ps}, it is unwise to assume there is no other method to observe process -environments. @xref{Environment variables}. -@end itemize - -All in all, the safest methods are to have the client program prompt for the -password or to specify the password in a properly protected @file{.my.cnf} -file. - -@node Secure connections, , Password security, User Account Management -@subsection Using Secure Connections - -@cindex OpenSSL -@cindex SSL and X509 Basics - -@menu -* Secure basics:: Basics -* Secure requirements:: Requirements -* Secure GRANT:: @code{GRANT} Options -@end menu - -@node Secure basics, Secure requirements, Secure connections, Secure connections -@subsubsection Basics - -Beginning with version 4.0.0, -MySQL has support for SSL encrypted connections. To understand how MySQL -uses SSL, it's necessary to explain some basic SSL and X509 concepts. People -who are already familiar with them can skip this part. - -By default, MySQL uses unencrypted connections between the client and the -server. This means that someone could watch all your traffic and look at -the data being sent or received. They could even change the data -while it is in transit between client and server. Sometimes you need to -move information over public networks in a secure fashion; in such cases, -using an unencrypted connection is unacceptable. - -SSL is a protocol that uses different encryption algorithms to ensure -that data received over a public network can be trusted. It has -mechanisms to detect any change, loss or replay of data. SSL also -incorporates algorithms to recognise and provide identity verification -using the X509 standard. - -@cindex What is encryption -Encryption is the way to make any kind of data unreadable. In fact, -today's practice requires many additional security elements from -encryption algorithms. They should resist many kind of known attacks -like just messing with the order of encrypted messages or replaying data -twice. - -@cindex What is X509/Certificate? -X509 is a standard that makes it possible to identify someone on the -Internet. It is most commonly used in e-commerce applications. In basic -terms, there should be some company (called a ``Certificate Authority'') that -assigns electronic certificates to anyone who needs them. Certificates -rely on asymmetric encryption algorithms that have two encryption keys -(a public key and a secret key). A certificate owner can prove his identity by -showing his certificate to other party. A certificate consists of its -owner's public key. Any data encrypted with this public key can be -decrypted only using the corresponding secret key, which is held by the owner -of the certificate. - -MySQL doesn't use encrypted connections by default, because doing so -would make the client/server protocol much slower. Any kind of -additional functionality requires the computer to do additional work and -encrypting data is a CPU-intensive operation that requires time and can delay -MySQL main tasks. By default MySQL is tuned to be fast as possible. - -If you need more information about SSL, X509, or encryption, you should use -your favourite Internet search engine and search for keywords in which you are -interested. - -@node Secure requirements, Secure GRANT, Secure basics, Secure connections -@subsubsection Requirements - -To get secure connections to work with MySQL you must do the following: - -@enumerate -@item -Install the OpenSSL library. We have tested MySQL with OpenSSL 0.9.6. -@uref{http://www.openssl.org/}. -@item -Configure MySQL with @code{--with-vio --with-openssl}. -@item -If you are using an old MySQL installation, you have to update your -@code{mysql.user} table with some new SSL-related columns. You can do this by -running the @code{mysql_fix_privilege_tables.sh} script. -This is necessary if your grant tables date from a version prior to MySQL -4.0.0. -@item -You can check if a running @code{mysqld} server supports OpenSSL by -examining if @code{SHOW VARIABLES LIKE 'have_openssl'} returns @code{YES}. -@end enumerate - - -@node Secure GRANT, , Secure requirements, Secure connections -@subsubsection @code{GRANT} Options - -@cindex SSL related options -@findex REQUIRE GRANT option -@findex GRANT statemenet - -MySQL can check X509 certificate attributes in addition to the -normal username/password scheme. All the usual options are still -required (username, password, IP address mask, database/table name). - -There are different possibilities to limit connections: - -@itemize @bullet -@item -Without any SSL or X509 options, all kind of encrypted/unencrypted -connections are allowed if the username and password are valid. - -@item -@code{REQUIRE SSL} option limits the server to allow only SSL -encrypted connections. Note that this option can be omitted -if there are any ACL records which allow non-SSL connections. - -@example -mysql> GRANT ALL PRIVILEGES ON test.* TO root@@localhost - -> IDENTIFIED BY "goodsecret" REQUIRE SSL; -@end example - -@item -@code{REQUIRE X509} means that the client should have a valid certificate -but we do not care about the exact certificate, issuer or subject. -The only restriction is that it should be possible to verify its -signature with one of the CA certificates. - -@example -mysql> GRANT ALL PRIVILEGES ON test.* TO root@@localhost - -> IDENTIFIED BY "goodsecret" REQUIRE X509; -@end example - -@item -@code{REQUIRE ISSUER "issuer"} places a restriction on connection attempts: -The client must present a valid X509 certificate issued by CA @code{"issuer"}. -Using X509 certificates always implies encryption, so the @code{SSL} option -is unneccessary. - -@example -mysql> GRANT ALL PRIVILEGES ON test.* TO root@@localhost - -> IDENTIFIED BY "goodsecret" - -> REQUIRE ISSUER "C=FI, ST=Some-State, L=Helsinki, - "> O=MySQL Finland AB, CN=Tonu Samuel/Email=tonu@@mysql.com"; -@end example - -@item -@code{REQUIRE SUBJECT "subject"} requires clients to have valid X509 -certificate with subject @code{"subject"} on it. If the client presents a -certificate that is valid but has a different @code{"subject"}, the connection -is disallowed. - -@example -mysql> GRANT ALL PRIVILEGES ON test.* TO root@@localhost - -> IDENTIFIED BY "goodsecret" - -> REQUIRE SUBJECT "C=EE, ST=Some-State, L=Tallinn, - "> O=MySQL demo client certificate, - "> CN=Tonu Samuel/Email=tonu@@mysql.com"; -@end example - -@item -@code{REQUIRE CIPHER "cipher"} is needed to assure enough strong ciphers -and keylengths will be used. SSL itself can be weak if old algorithms -with short encryption keys are used. Using this option, we can ask for -some exact cipher method to allow a connection. - -@example -mysql> GRANT ALL PRIVILEGES ON test.* TO root@@localhost - -> IDENTIFIED BY "goodsecret" - -> REQUIRE CIPHER "EDH-RSA-DES-CBC3-SHA"; -@end example - -The @code{SUBJECT}, @code{ISSUER}, and @code{CIPHER} options can be -combined in the @code{REQUIRE} clause like this: - -@example -mysql> GRANT ALL PRIVILEGES ON test.* TO root@@localhost - -> IDENTIFIED BY "goodsecret" - -> REQUIRE SUBJECT "C=EE, ST=Some-State, L=Tallinn, - "> O=MySQL demo client certificate, - "> CN=Tonu Samuel/Email=tonu@@mysql.com" - -> AND ISSUER "C=FI, ST=Some-State, L=Helsinki, - "> O=MySQL Finland AB, CN=Tonu Samuel/Email=tonu@@mysql.com" - -> AND CIPHER "EDH-RSA-DES-CBC3-SHA"; -@end example - -Starting from MySQL 4.0.4 the @code{AND} keyword is optional between -@code{REQUIRE} options. - -The order of the options does not matter, but no option can be specified -twice. -@end itemize - - -@node Disaster Prevention, Database Administration, User Account Management, MySQL Database Administration -@section Disaster Prevention and Recovery - -@c FIX: add section intro - -@menu -* Backup:: Database Backups -* BACKUP TABLE:: @code{BACKUP TABLE} Syntax -* RESTORE TABLE:: @code{RESTORE TABLE} Syntax -* CHECK TABLE:: @code{CHECK TABLE} Syntax -* REPAIR TABLE:: @code{REPAIR TABLE} Syntax -* Table maintenance:: Using @code{myisamchk} for Table Maintenance and Crash Recovery -* Maintenance regimen:: Setting Up a Table Maintenance Regimen -* Table-info:: Getting Information About a Table -@end menu - - -@node Backup, BACKUP TABLE, Disaster Prevention, Disaster Prevention -@subsection Database Backups - -@cindex databases, backups -@cindex backups - -Because MySQL tables are stored as files, it is easy to do a -backup. To get a consistent backup, do a @code{LOCK TABLES} on the -relevant tables followed by @code{FLUSH TABLES} for the tables. -@xref{LOCK TABLES, , @code{LOCK TABLES}}. -@xref{FLUSH, , @code{FLUSH}}. -You only need a read lock; this allows other threads to continue to -query the tables while you are making a copy of the files in the -database directory. The @code{FLUSH TABLE} is needed to ensure that -the all active index pages is written to disk before you start the backup. - -If you want to make a SQL level backup of a table, you can use -@code{SELECT INTO OUTFILE} or @code{BACKUP TABLE}. @xref{SELECT}. -@xref{BACKUP TABLE}. - -Another way to back up a database is to use the @code{mysqldump} program or -the @code{mysqlhotcopy script}. @xref{mysqldump, , @code{mysqldump}}. -@xref{mysqlhotcopy, , @code{mysqlhotcopy}}. - -@enumerate -@item -Do a full backup of your databases: - -@example -shell> mysqldump --tab=/path/to/some/dir --opt --all - -or - -shell> mysqlhotcopy database /path/to/some/dir -@end example - -You can also simply copy all table files (@file{*.frm}, @file{*.MYD}, and -@file{*.MYI} files) as long as the server isn't updating anything. -The script @code{mysqlhotcopy} does use this method. - -@item -@cindex log files, names -@cindex @code{mysqlbinlog} -Stop @code{mysqld} if it's running, then start it with the -@code{--log-update[=file_name]} option. @xref{Update log}. The update -log file(s) provide you with the information you need to replicate -changes to the database that are made subsequent to the point at which -you executed @code{mysqldump}. -@end enumerate - -If you have to restore something, try to recover your tables using -@code{REPAIR TABLE} or @code{myisamchk -r} first. That should work in -99.9% of all cases. If @code{myisamchk} fails, try the following -procedure (this will only work if you have started MySQL with -@code{--log-update}, @pxref{Update log}): - -@enumerate -@item -Restore the original @code{mysqldump} backup. -@item -Execute the following command to re-run the updates in the binary log: - -@example -shell> mysqlbinlog hostname-bin.[0-9]* | mysql -@end example - -If you are using the update log you can use: - -@example -shell> ls -1 -t -r hostname.[0-9]* | xargs cat | mysql -@end example -@end enumerate - -@code{ls} is used to get all the update log files in the right order. - -You can also do selective backups with @code{SELECT * INTO OUTFILE 'file_name' -FROM tbl_name} and restore with @code{LOAD DATA INFILE 'file_name' REPLACE -...} To avoid duplicate records, you need a @code{PRIMARY KEY} or a -@code{UNIQUE} key in the table. The @code{REPLACE} keyword causes old records -to be replaced with new ones when a new record duplicates an old record on -a unique key value. - -If you get performance problems in making backups on your system, you can -solve this by setting up replication and do the backups on the slave -instead of on the master. @xref{Replication Intro}. - -If you are using a Veritas filesystem, you can do: - -@enumerate -@item -From a client (or Perl), execute: @code{FLUSH TABLES WITH READ LOCK}. - -@item -From another shell, execute: @code{mount vxfs snapshot}. - -@item -From the first client, execute: @code{UNLOCK TABLES}. - -@item -Copy files from snapshot. - -@item -Unmount snapshot. -@end enumerate - - -@node BACKUP TABLE, RESTORE TABLE, Backup, Disaster Prevention -@subsection @code{BACKUP TABLE} Syntax - -@findex BACKUP TABLE - -@cindex backups, database - -@example -BACKUP TABLE tbl_name[,tbl_name...] TO '/path/to/backup/directory' -@end example - -Copies to the backup directory the minimum number of table files needed -to restore the table, after flushing any buffered changes to disk. Currently -works only for @code{MyISAM} tables. -For @code{MyISAM} tables, copies @file{.frm} (definition) and -@file{.MYD} (data) files. The index file can be rebuilt from those two. - -Before using this command, please see @ref{Backup}. - -During the backup, a read lock will be held for each table, one at time, -as they are being backed up. If you want to back up several tables as -a snapshot, you must first issue @code{LOCK TABLES} obtaining a read -lock for each table in the group. - -The command returns a table with the following columns: - -@multitable @columnfractions .15 .40 -@item @strong{Column} @tab @strong{Value} -@item Table @tab Table name -@item Op @tab Always ``backup'' -@item Msg_type @tab One of @code{status}, @code{error}, @code{info} or @code{warning}. -@item Msg_text @tab The message. -@end multitable - -Note that @code{BACKUP TABLE} is only available in MySQL -version 3.23.25 and later. - - -@node RESTORE TABLE, CHECK TABLE, BACKUP TABLE, Disaster Prevention -@subsection @code{RESTORE TABLE} Syntax - -@findex RESTORE TABLE - -@example -RESTORE TABLE tbl_name[,tbl_name...] FROM '/path/to/backup/directory' -@end example - -Restores the table(s) from the backup that was made with -@code{BACKUP TABLE}. Existing tables will not be overwritten; if you -try to restore over an existing table, you will get an error. Restoring -will take longer than backing up due to the need to rebuild the index. The -more keys you have, the longer it will take. Just as @code{BACKUP TABLE}, -@code{RESTORE TABLE} currently works only for @code{MyISAM} tables. - - -The command returns a table with the following columns: - -@multitable @columnfractions .15 .40 -@item @strong{Column} @tab @strong{Value} -@item Table @tab Table name -@item Op @tab Always ``restore'' -@item Msg_type @tab One of @code{status}, @code{error}, @code{info} or @code{warning}. -@item Msg_text @tab The message. -@end multitable - - -@node CHECK TABLE, REPAIR TABLE, RESTORE TABLE, Disaster Prevention -@subsection @code{CHECK TABLE} Syntax - -@findex CHECK TABLE - -@example -CHECK TABLE tbl_name[,tbl_name...] [option [option...]] - -option = QUICK | FAST | MEDIUM | EXTENDED | CHANGED -@end example - -@code{CHECK TABLE} works only on @code{MyISAM} and @code{InnoDB} tables. On -@code{MyISAM} tables it's the same thing as running @code{myisamchk -m -table_name} on the table. - -If you don't specify any option @code{MEDIUM} is used. - -Checks the table(s) for errors. For @code{MyISAM} tables the key statistics -are updated. The command returns a table with the following columns: - -@multitable @columnfractions .15 .40 -@item @strong{Column} @tab @strong{Value} -@item Table @tab Table name. -@item Op @tab Always ``check''. -@item Msg_type @tab One of @code{status}, @code{error}, @code{info}, or @code{warning}. -@item Msg_text @tab The message. -@end multitable - -Note that you can get many rows of information for each checked -table. The last row will be of @code{Msg_type status} and should -normally be @code{OK}. If you don't get @code{OK}, or @code{Not -checked} you should normally run a repair of the table. @xref{Table -maintenance}. @code{Not checked} means that the table the given @code{TYPE} -told MySQL that there wasn't any need to check the table. - -The different check types stand for the following: - -@multitable @columnfractions .15 .85 -@item @strong{Type} @tab @strong{Meaning} -@item @code{QUICK} @tab Don't scan the rows to check for wrong links. -@item @code{FAST} @tab Only check tables which haven't been closed properly. -@item @code{CHANGED} @tab Only check tables which have been changed since last check or haven't been closed properly. -@item @code{MEDIUM} @tab Scan rows to verify that deleted links are okay. This also calculates a key checksum for the rows and verifies this with a calculated checksum for the keys. -@item @code{EXTENDED} @tab Do a full key lookup for all keys for each row. This ensures that the table is 100% consistent, but will take a long time! -@end multitable - -For dynamically sized @code{MyISAM} tables a started check will always -do a @code{MEDIUM} check. For statically sized rows we skip the row scan -for @code{QUICK} and @code{FAST} as the rows are very seldom corrupted. - -You can combine check options as in: - -@example -CHECK TABLE test_table FAST QUICK; -@end example - -Which would simply do a quick check on the table to see whether it was -closed properly. - -@strong{Note}: that in some case @code{CHECK TABLE} will change the -table! This happens if the table is marked as 'corrupted' or 'not -closed properly' but @code{CHECK TABLE} didn't find any problems in the -table. In this case @code{CHECK TABLE} will mark the table as okay. - -If a table is corrupted, then it's most likely that the problem is in -the indexes and not in the data part. All of the above check types -checks the indexes thoroughly and should thus find most errors. - -If you just want to check a table that you assume is okay, you should use -no check options or the @code{QUICK} option. The latter should be used -when you are in a hurry and can take the very small risk that -@code{QUICK} didn't find an error in the datafile. (In most cases -MySQL should find, under normal usage, any error in the data -file. If this happens then the table will be marked as 'corrupted', -in which case the table can't be used until it's repaired.) - -@code{FAST} and @code{CHANGED} are mostly intended to be used from a -script (for example to be executed from @code{cron}) if you want to check your -table from time to time. In most cases you @code{FAST} is to be prefered -over @code{CHANGED}. (The only case when it isn't is when you suspect a -bug you have found a bug in the @code{MyISAM} code.) - -@code{EXTENDED} is only to be used after you have run a normal check but -still get strange errors from a table when MySQL tries to -update a row or find a row by key (this is very unlikely if a -normal check has succeeded!). - -Some things reported by check table, can't be corrected automatically: - -@itemize @bullet -@item -@code{Found row where the auto_increment column has the value 0}. - -This means that you have in the table a row where the -@code{AUTO_INCREMENT} index column contains the value 0. -(It's possible to create a row where the @code{AUTO_INCREMENT} column is 0 by -explicitly setting the column to 0 with an @code{UPDATE} statement) - -This isn't an error in itself, but could cause trouble if you decide to -dump the table and restore it or do an @code{ALTER TABLE} on the -table. In this case the @code{AUTO_INCREMENT} column will change value, -according to the rules of @code{AUTO_INCREMENT} columns, which could cause -problems like a duplicate key error. - -To get rid of the warning, just execute an @code{UPDATE} statement -to set the column to some other value than 0. -@end itemize - - -@node REPAIR TABLE, Table maintenance, CHECK TABLE, Disaster Prevention -@subsection @code{REPAIR TABLE} Syntax - -@findex REPAIR TABLE - -@example -REPAIR TABLE tbl_name[,tbl_name...] [QUICK] [EXTENDED] [USE_FRM] -@end example - -@code{REPAIR TABLE} works only on @code{MyISAM} tables and is the same -as running @code{myisamchk -r table_name} on the table. - -Normally you should never have to run this command, but if disaster strikes -you are very likely to get back all your data from a MyISAM table with -@code{REPAIR TABLE}. If your tables get corrupted a lot you should -try to find the reason for this! @xref{Crashing}. @xref{MyISAM table problems}. - -@code{REPAIR TABLE} repairs a possible corrupted table. The command returns a -table with the following columns: - -@multitable @columnfractions .15 .40 -@item @strong{Column} @tab @strong{Value} -@item Table @tab Table name -@item Op @tab Always ``repair'' -@item Msg_type @tab One of @code{status}, @code{error}, @code{info} or @code{warning}. -@item Msg_text @tab The message. -@end multitable - -Note that you can get many rows of information for each repaired -table. The last one row will be of @code{Msg_type status} and should -normally be @code{OK}. If you don't get @code{OK}, you should try -repairing the table with @code{myisamchk -o}, as @code{REPAIR TABLE} -does not yet implement all the options of @code{myisamchk}. In the near -future, we will make it more flexible. - -If @code{QUICK} is given then MySQL will try to do a -@code{REPAIR} of only the index tree. - -If you use @code{EXTENDED} then MySQL will create the index row -by row instead of creating one index at a time with sorting; this may be -better than sorting on fixed-length keys if you have long @code{CHAR} -keys that compress very well. This type of repair is like that done by -@code{myisamchk --safe-recover}. - -As of @code{MySQL} 4.0.2, there is a @code{USE_FRM} mode for @code{REPAIR}. -Use it if the @file{.MYI} file is missing or if its header is corrupted. -In this mode MySQL will recreate the table, using information from the -@file{.frm} file. This kind of repair cannot be done with @code{myisamchk}. - -@node Table maintenance, Maintenance regimen, REPAIR TABLE, Disaster Prevention -@subsection Using @code{myisamchk} for Table Maintenance and Crash Recovery - -Starting with MySQL Version 3.23.13, you can check MyISAM -tables with the @code{CHECK TABLE} command. @xref{CHECK TABLE}. You can -repair tables with the @code{REPAIR TABLE} command. @xref{REPAIR TABLE}. - -To check/repair MyISAM tables (@file{.MYI} and @file{.MYD}) you should -use the @code{myisamchk} utility. To check/repair ISAM tables -(@file{.ISM} and @file{.ISD}) you should use the @code{isamchk} -utility. @xref{Table types}. - -In the following text we will talk about @code{myisamchk}, but everything -also applies to the old @code{isamchk}. - -You can use the @code{myisamchk} utility to get information about your -database tables, check and repair them, or optimise them. The following -sections describe how to invoke @code{myisamchk} (including a -description of its options), how to set up a table maintenance schedule, -and how to use @code{myisamchk} to perform its various functions. - -You can, in most cases, also use the command @code{OPTIMIZE TABLES} to -optimise and repair tables, but this is not as fast or reliable (in case -of real fatal errors) as @code{myisamchk}. On the other hand, -@code{OPTIMIZE TABLE} is easier to use and you don't have to worry about -flushing tables. -@xref{OPTIMIZE TABLE, , @code{OPTIMIZE TABLE}}. - -Even that the repair in @code{myisamchk} is quite secure, it's always a -good idea to make a backup @emph{before} doing a repair (or anything that could -make a lot of changes to a table) - -@menu -* myisamchk syntax:: @code{myisamchk} Invocation Syntax -* myisamchk general options:: General Options for @code{myisamchk} -* myisamchk check options:: Check Options for @code{myisamchk} -* myisamchk repair options:: Repair Options for myisamchk -* myisamchk other options:: Other Options for @code{myisamchk} -* myisamchk memory:: @code{myisamchk} Memory Usage -* Crash recovery:: Using @code{myisamchk} for Crash Recovery -* Check:: How to Check Tables for Errors -* Repair:: How to Repair Tables -* Optimisation:: Table Optimisation -@end menu - - -@node myisamchk syntax, myisamchk general options, Table maintenance, Table maintenance -@subsubsection @code{myisamchk} Invocation Syntax - -@code{myisamchk} is invoked like this: - -@example -shell> myisamchk [options] tbl_name -@end example - -The @code{options} specify what you want @code{myisamchk} to do. They are -described here. (You can also get a list of options by invoking -@code{myisamchk --help}.) With no options, @code{myisamchk} simply checks your -table. To get more information or to tell @code{myisamchk} to take corrective -action, specify options as described here and in the following sections. - -@code{tbl_name} is the database table you want to check/repair. If you run -@code{myisamchk} somewhere other than in the database directory, you must -specify the path to the file, because @code{myisamchk} has no idea where your -database is located. Actually, @code{myisamchk} doesn't care whether -the files you are working on are located in a database directory; you can -copy the files that correspond to a database table into another location and -perform recovery operations on them there. - -You can name several tables on the @code{myisamchk} command-line if you -wish. You can also specify a name as an index file -name (with the @file{.MYI} suffix), which allows you to specify all -tables in a directory by using the pattern @file{*.MYI}. -For example, if you are in a database directory, you can check all the -tables in the directory like this: - -@example -shell> myisamchk *.MYI -@end example - -If you are not in the database directory, you can check all the tables there -by specifying the path to the directory: - -@example -shell> myisamchk /path/to/database_dir/*.MYI -@end example - -You can even check all tables in all databases by specifying a wildcard -with the path to the MySQL data directory: - -@example -shell> myisamchk /path/to/datadir/*/*.MYI -@end example - -The recommended way to quickly check all tables is: - -@example -myisamchk --silent --fast /path/to/datadir/*/*.MYI -isamchk --silent /path/to/datadir/*/*.ISM -@end example - -If you want to check all tables and repair all tables that are corrupted, -you can use the following line: - -@example -myisamchk --silent --force --fast --update-state -O key_buffer=64M \ - -O sort_buffer=64M -O read_buffer=1M -O write_buffer=1M \ - /path/to/datadir/*/*.MYI -isamchk --silent --force -O key_buffer=64M -O sort_buffer=64M \ - -O read_buffer=1M -O write_buffer=1M /path/to/datadir/*/*.ISM -@end example - -The above assumes that you have more than 64 M free. - -Note that if you get an error like: - -@example -myisamchk: warning: 1 clients is using or hasn't closed the table properly -@end example - -This means that you are trying to check a table that has been updated by -the another program (like the @code{mysqld} server) that hasn't yet closed -the file or that has died without closing the file properly. - -If you @code{mysqld} is running, you must force a sync/close of all -tables with @code{FLUSH TABLES} and ensure that no one is using the -tables while you are running @code{myisamchk}. In MySQL Version 3.23 -the easiest way to avoid this problem is to use @code{CHECK TABLE} -instead of @code{myisamchk} to check tables. - -@node myisamchk general options, myisamchk check options, myisamchk syntax, Table maintenance -@subsubsection General Options for @code{myisamchk} - -@cindex options, @code{myisamchk} -@cindex @code{myisamchk}, options - -@code{myisamchk} supports the following options. - -@table @code -@item -# or --debug=debug_options -Output debug log. The @code{debug_options} string often is -@code{'d:t:o,filename'}. -@item -? or --help -Display a help message and exit. -@item -O var=option, --set-variable var=option -Set the value of a variable. Please note that @code{--set-variable} is -deprecated since @strong{MySQL 4.0}, just use @code{--var=option} instead. -The possible variables and their default values for myisamchk can be examined -with @code{myisamchk --help}: -@multitable @columnfractions .20 .10 -@item @strong{Variable} @tab @strong{Value} -@item key_buffer_size @tab 523264 -@item read_buffer_size @tab 262136 -@item write_buffer_size @tab 262136 -@item sort_buffer_size @tab 2097144 -@item sort_key_blocks @tab 16 -@item decode_bits @tab 9 -@end multitable - -@code{sort_buffer_size} is used when the keys are repaired by sorting -keys, which is the normal case when you use @code{--recover}. - -@code{key_buffer_size} is used when you are checking the table with -@code{--extended-check} or when the keys are repaired by inserting key -row by row in to the table (like when doing normal inserts). Repairing -through the key buffer is used in the following cases: - -@itemize @bullet -@item -If you use @code{--safe-recover}. -@item -If the temporary files needed to sort the keys would be more than twice -as big as when creating the key file directly. This is often the case -when you have big @code{CHAR}, @code{VARCHAR} or @code{TEXT} keys as the -sort needs to store the whole keys during sorting. If you have lots -of temporary space and you can force @code{myisamchk} to repair by sorting -you can use the @code{--sort-recover} option. -@end itemize - -Reparing through the key buffer takes much less disk space than using -sorting, but is also much slower. - -If you want a faster repair, set the above variables to about 1/4 of your -available memory. You can set both variables to big values, as only one -of the above buffers will be used at a time. - -@item -s or --silent -Silent mode. Write output only when errors occur. You can use @code{-s} -twice (@code{-ss}) to make @code{myisamchk} very silent. -@item -v or --verbose -Verbose mode. Print more information. This can be used with @code{-d} and -@code{-e}. Use @code{-v} multiple times (@code{-vv}, @code{-vvv}) for more -verbosity! -@item -V or --version -Print the @code{myisamchk} version and exit. -@item -w or, --wait -Instead of giving an error if the table is locked, wait until the table -is unlocked before continuing. Note that if you are running @code{mysqld} -on the table with @code{--skip-external-locking}, the table can only be locked -by another @code{myisamchk} command. -@end table - - -@node myisamchk check options, myisamchk repair options, myisamchk general options, Table maintenance -@subsubsection Check Options for @code{myisamchk} - -@cindex check options, myisamchk -@cindex tables, checking - -@table @code -@item -c or --check -Check table for errors. This is the default operation if you are not -giving @code{myisamchk} any options that override this. - -@item -e or --extend-check -Check the table very thoroughly (which is quite slow if you have many -indexes). This option should only be used in extreme cases. Normally, -@code{myisamchk} or @code{myisamchk --medium-check} should, in most -cases, be able to find out if there are any errors in the table. - -If you are using @code{--extended-check} and have much memory, you should -increase the value of @code{key_buffer_size} a lot! - -@item -F or --fast -Check only tables that haven't been closed properly. -@item -C or --check-only-changed -Check only tables that have changed since the last check. -@item -f or --force -Restart @code{myisamchk} with @code{-r} (repair) on the table, if -@code{myisamchk} finds any errors in the table. -@item -i or --information -Print informational statistics about the table that is checked. -@item -m or --medium-check -Faster than extended-check, but only finds 99.99% of all errors. -Should, however, be good enough for most cases. -@item -U or --update-state -Store in the @file{.MYI} file when the table was checked and if the table crashed. This should be used to get full benefit of the -@code{--check-only-changed} option, but you shouldn't use this -option if the @code{mysqld} server is using the table and you are -running @code{mysqld} with @code{--skip-external-locking}. -@item -T or --read-only -Don't mark table as checked. This is useful if you use @code{myisamchk} -to check a table that is in use by some other application that doesn't -use locking (like @code{mysqld --skip-external-locking}). -@end table - - -@node myisamchk repair options, myisamchk other options, myisamchk check options, Table maintenance -@subsubsection Repair Options for myisamchk - -@cindex repair options, myisamchk -@cindex files, repairing - -The following options are used if you start @code{myisamchk} with -@code{-r} or @code{-o}: - -@table @code -@item -D # or --data-file-length=# -Max length of datafile (when re-creating datafile when it's 'full'). -@item -e or --extend-check -Try to recover every possible row from the datafile. -Normally this will also find a lot of garbage rows. Don't use this option -if you are not totally desperate. -@item -f or --force -Overwrite old temporary files (@code{table_name.TMD}) instead of aborting. -@item -k # or keys-used=# -If you are using ISAM, tells the ISAM table handler to update only the -first @code{#} indexes. If you are using @code{MyISAM}, tells which keys -to use, where each binary bit stands for one key (first key is bit 0). -This can be used to get faster inserts! Deactivated indexes can be -reactivated by using @code{myisamchk -r}. keys. -@item -l or --no-symlinks -Do not follow symbolic links. Normally @code{myisamchk} repairs the -table a symlink points at. This option doesn't exist in MySQL 4.0, -as MySQL 4.0 will not remove symlinks during repair. -@item -r or --recover -Can fix almost anything except unique keys that aren't unique -(which is an extremely unlikely error with ISAM/MyISAM tables). -If you want to recover a table, this is the option to try first. Only if -myisamchk reports that the table can't be recovered by @code{-r}, you -should then try @code{-o}. (Note that in the unlikely case that @code{-r} -fails, the datafile is still intact.) -If you have lots of memory, you should increase the size of -@code{sort_buffer_size}! -@item -o or --safe-recover -Uses an old recovery method (reads through all rows in order and updates -all index trees based on the found rows); this is an order of magnitude -slower than @code{-r}, but can handle a couple of very unlikely cases that -@code{-r} cannot handle. This recovery method also uses much less disk -space than @code{-r}. Normally one should always first repair with -@code{-r}, and only if this fails use @code{-o}. - -If you have lots of memory, you should increase the size of -@code{key_buffer_size}! -@item -n or --sort-recover -Force @code{myisamchk} to use sorting to resolve the keys even if the -temporary files should be very big. - -@item --character-sets-dir=... -Directory where character sets are stored. -@item --set-character-set=name -Change the character set used by the index -@item -t or --tmpdir=path -Path for storing temporary files. If this is not set, @code{myisamchk} will -use the environment variable @code{TMPDIR} for this. -@item -q or --quick -Faster repair by not modifying the datafile. One can give a second -@code{-q} to force @code{myisamchk} to modify the original datafile in case -of duplicate keys -@item -u or --unpack -Unpack file packed with myisampack. -@end table - - -@node myisamchk other options, myisamchk memory, myisamchk repair options, Table maintenance -@subsubsection Other Options for @code{myisamchk} - -Other actions that @code{myisamchk} can do, besides repair and check tables: - -@table @code -@item -a or --analyze -Analyse the distribution of keys. This improves join performance by -enabling the join optimiser to better choose in which order it should -join the tables and which keys it should use: -@code{myisamchk --describe --verbose table_name'} or using @code{SHOW KEYS} in -MySQL. -@item -d or --description -Prints some information about table. -@item -A or --set-auto-increment[=value] -Force @code{AUTO_INCREMENT} to start at this or higher value. If no value is -given, then sets the next @code{AUTO_INCREMENT} value to the highest used value -for the auto key + 1. -@item -S or --sort-index -Sort the index tree blocks in high-low order. -This will optimise seeks and will make table scanning by key faster. -@item -R or --sort-records=# -Sorts records according to an index. This makes your data much more localised -and may speed up ranged @code{SELECT} and @code{ORDER BY} operations on -this index. (It may be very slow to do a sort the first time!) -To find out a table's index numbers, use @code{SHOW INDEX}, which shows a -table's indexes in the same order that @code{myisamchk} sees them. Indexes are -numbered beginning with 1. -@end table - - -@node myisamchk memory, Crash recovery, myisamchk other options, Table maintenance -@subsubsection @code{myisamchk} Memory Usage - -@cindex memory usage, myisamchk - -Memory allocation is important when you run @code{myisamchk}. -@code{myisamchk} uses no more memory than you specify with the @code{-O} -options. If you are going to use @code{myisamchk} on very large files, -you should first decide how much memory you want it to use. The default -is to use only about 3M to fix things. By using larger values, you can -get @code{myisamchk} to operate faster. For example, if you have more -than 32M RAM, you could use options such as these (in addition to any -other options you might specify): - -@example -shell> myisamchk -O sort=16M -O key=16M -O read=1M -O write=1M ... -@end example - -Using @code{-O sort=16M} should probably be enough for most cases. - -Be aware that @code{myisamchk} uses temporary files in @code{TMPDIR}. If -@code{TMPDIR} points to a memory filesystem, you may easily get out of -memory errors. If this happens, set @code{TMPDIR} to point at some directory -with more space and restart @code{myisamchk}. - -When repairing, @code{myisamchk} will also need a lot of disk space: - -@itemize @bullet -@item -Double the size of the record file (the original one and a copy). This -space is not needed if one does a repair with @code{--quick}, as in this -case only the index file will be re-created. This space is needed on the -same disk as the original record file! -@item -Space for the new index file that replaces the old one. The old -index file is truncated at start, so one usually ignore this space. -This space is needed on the same disk as the original index file! -@item -When using @code{--recover} or @code{--sort-recover} -(but not when using @code{--safe-recover}), you will need space for a -sort buffer for: -@code{(largest_key + row_pointer_length)*number_of_rows * 2}. -You can check the length of the keys and the row_pointer_length with -@code{myisamchk -dv table}. -This space is allocated on the temporary disk (specified by @code{TMPDIR} or -@code{--tmpdir=#}). -@end itemize - -If you have a problem with disk space during repair, you can try to use -@code{--safe-recover} instead of @code{--recover}. - - -@node Crash recovery, Check, myisamchk memory, Table maintenance -@subsubsection Using @code{myisamchk} for Crash Recovery - -@cindex crash, recovery -@cindex recovery, from crash - -If you run @code{mysqld} with @code{--skip-external-locking} (which is the -default on some systems, like Linux), you can't reliably use @code{myisamchk} -to check a table when @code{mysqld} is using the same table. If you -can be sure that no one is accessing the tables through @code{mysqld} -while you run @code{myisamchk}, you only have to do @code{mysqladmin -flush-tables} before you start checking the tables. If you can't -guarantee the above, then you must take down @code{mysqld} while you -check the tables. If you run @code{myisamchk} while @code{mysqld} is updating -the tables, you may get a warning that a table is corrupt even if it -isn't. - -If you are not using @code{--skip-external-locking}, you can use -@code{myisamchk} to check tables at any time. While you do this, all clients -that try to update the table will wait until @code{myisamchk} is ready before -continuing. - -If you use @code{myisamchk} to repair or optimise tables, you -@strong{must} always ensure that the @code{mysqld} server is not using -the table (this also applies if you are using @code{--skip-external-locking}). -If you don't take down @code{mysqld} you should at least do a -@code{mysqladmin flush-tables} before you run @code{myisamchk}. -Your tables @strong{may be corrupted} if the server and @code{myisamchk} -access the tables simultaneously. - -This chapter describes how to check for and deal with data corruption -in MySQL databases. If your tables get corrupted frequently you should -try to find the reason for this! @xref{Crashing}. - -The @code{MyISAM} table section contains reason for why a table could be -corrupted. @xref{MyISAM table problems}. - -When performing crash recovery, it is important to understand that each table -@code{tbl_name} in a database corresponds to three files in the database -directory: - -@multitable @columnfractions .20 .30 -@item @strong{File} @tab @strong{Purpose} -@item @file{tbl_name.frm} @tab Table definition (form) file -@item @file{tbl_name.MYD} @tab Datafile -@item @file{tbl_name.MYI} @tab Index file -@end multitable - -Each of these three file types is subject to corruption in various ways, but -problems occur most often in datafiles and index files. - -@code{myisamchk} works by creating a copy of the @file{.MYD} (data) file -row by row. It ends the repair stage by removing the old @file{.MYD} -file and renaming the new file to the original file name. If you use -@code{--quick}, @code{myisamchk} does not create a temporary @file{.MYD} -file, but instead assumes that the @file{.MYD} file is correct and only -generates a new index file without touching the @file{.MYD} file. This -is safe, because @code{myisamchk} automatically detects if the -@file{.MYD} file is corrupt and aborts the repair in this case. You can -also give two @code{--quick} options to @code{myisamchk}. In this case, -@code{myisamchk} does not abort on some errors (like duplicate key) but -instead tries to resolve them by modifying the @file{.MYD} -file. Normally the use of two @code{--quick} options is useful only if -you have too little free disk space to perform a normal repair. In this -case you should at least make a backup before running @code{myisamchk}. - - -@node Check, Repair, Crash recovery, Table maintenance -@subsubsection How to Check Tables for Errors - -@cindex checking, tables for errors -@cindex tables, error checking -@cindex errors, checking tables for - -To check a MyISAM table, use the following commands: - -@table @code -@item myisamchk tbl_name -This finds 99.99% of all errors. What it can't find is corruption that -involves @strong{only} the datafile (which is very unusual). If you want -to check a table, you should normally run @code{myisamchk} without options or -with either the @code{-s} or @code{--silent} option. - -@item myisamchk -m tbl_name -This finds 99.999% of all errors. It checks first all index entries for errors and -then it reads through all rows. It calculates a checksum for all keys in -the rows and verifies that they checksum matches the checksum for the keys -in the index tree. - -@item myisamchk -e tbl_name -This does a complete and thorough check of all data (@code{-e} means -``extended check''). It does a check-read of every key for each row to verify -that they indeed point to the correct row. This may take a long time on a -big table with many keys. @code{myisamchk} will normally stop after the first -error it finds. If you want to obtain more information, you can add the -@code{--verbose} (@code{-v}) option. This causes @code{myisamchk} to keep -going, up through a maximum of 20 errors. In normal usage, a simple -@code{myisamchk} (with no arguments other than the table name) is sufficient. - -@item myisamchk -e -i tbl_name -Like the previous command, but the @code{-i} option tells @code{myisamchk} to -print some informational statistics, too. -@end table - - -@node Repair, Optimisation, Check, Table maintenance -@subsubsection How to Repair Tables - -@cindex tables, repairing -@cindex repairing, tables - -In the following section we only talk about using @code{myisamchk} on -@code{MyISAM} tables (extensions @file{.MYI} and @file{.MYD}). If you -are using @code{ISAM} tables (extensions @file{.ISM} and @file{.ISD}), -you should use @code{isamchk} instead. - -Starting with MySQL Version 3.23.14, you can repair MyISAM -tables with the @code{REPAIR TABLE} command. @xref{REPAIR TABLE}. - -The symptoms of a corrupted table include queries that abort unexpectedly -and observable errors such as these: - -@itemize @bullet -@item -@file{tbl_name.frm} is locked against change -@item -Can't find file @file{tbl_name.MYI} (Errcode: ###) -@item -Unexpected end of file -@item -Record file is crashed -@item -Got error ### from table handler - -To get more information about the error you can run @code{perror ###}. Here -is the most common errors that indicates a problem with the table: - -@example -shell> perror 126 127 132 134 135 136 141 144 145 -126 = Index file is crashed / Wrong file format -127 = Record-file is crashed -132 = Old database file -134 = Record was already deleted (or record file crashed) -135 = No more room in record file -136 = No more room in index file -141 = Duplicate unique key or constraint on write or update -144 = Table is crashed and last repair failed -145 = Table was marked as crashed and should be repaired -@end example - -Note that error 135, no more room in record file, is not an error that -can be fixed by a simple repair. In this case you have to do: - -@example -ALTER TABLE table MAX_ROWS=xxx AVG_ROW_LENGTH=yyy; -@end example - -@end itemize - -In the other cases, you must repair your tables. @code{myisamchk} -can usually detect and fix most things that go wrong. - -The repair process involves up to four stages, described here. Before you -begin, you should @code{cd} to the database directory and check the -permissions of the table files. Make sure they are readable by the Unix user -that @code{mysqld} runs as (and to you, because you need to access the files -you are checking). If it turns out you need to modify files, they must also -be writable by you. - -If you are using MySQL Version 3.23.16 and above, you can (and -should) use the @code{CHECK} and @code{REPAIR} commands to check and repair -@code{MyISAM} tables. @xref{CHECK TABLE}. @xref{REPAIR TABLE}. - -The manual section about table maintenance includes the options to -@code{isamchk}/@code{myisamchk}. @xref{Table maintenance}. - -The following section is for the cases where the above command fails or -if you want to use the extended features that @code{isamchk}/@code{myisamchk} provides. - -If you are going to repair a table from the command-line, you must first -take down the @code{mysqld} server. Note that when you do -@code{mysqladmin shutdown} on a remote server, the @code{mysqld} server -will still be alive for a while after @code{mysqladmin} returns, until -all queries are stopped and all keys have been flushed to disk. - -@noindent -@strong{Stage 1: Checking your tables} - -Run @code{myisamchk *.MYI} or @code{myisamchk -e *.MYI} if you have -more time. Use the @code{-s} (silent) option to suppress unnecessary -information. - -If the @code{mysqld} server is done you should use the --update option to tell -@code{myisamchk} to mark the table as 'checked'. - -You have to repair only those tables for which @code{myisamchk} announces an -error. For such tables, proceed to Stage 2. - -If you get weird errors when checking (such as @code{out of -memory} errors), or if @code{myisamchk} crashes, go to Stage 3. - -@noindent -@strong{Stage 2: Easy safe repair} - -Note: If you want repairing to go much faster, you should add: @code{-O -sort_buffer=# -O key_buffer=#} (where # is about 1/4 of the available -memory) to all @code{isamchk/myisamchk} commands. - -First, try @code{myisamchk -r -q tbl_name} (@code{-r -q} means ``quick -recovery mode''). This will attempt to repair the index file without -touching the datafile. If the datafile contains everything that it -should and the delete links point at the correct locations within the -datafile, this should work, and the table is fixed. Start repairing the -next table. Otherwise, use the following procedure: - -@enumerate -@item -Make a backup of the datafile before continuing. - -@item -Use @code{myisamchk -r tbl_name} (@code{-r} means ``recovery mode''). This will -remove incorrect records and deleted records from the datafile and -reconstruct the index file. - -@item -If the preceding step fails, use @code{myisamchk --safe-recover tbl_name}. -Safe recovery mode uses an old recovery method that handles a few cases that -regular recovery mode doesn't (but is slower). -@end enumerate - -If you get weird errors when repairing (such as @code{out of -memory} errors), or if @code{myisamchk} crashes, go to Stage 3. - -@noindent -@strong{Stage 3: Difficult repair} - -You should only reach this stage if the first 16K block in the index file is -destroyed or contains incorrect information, or if the index file is -missing. In this case, it's necessary to create a new index file. Do so as -follows: - -@enumerate -@item -Move the datafile to some safe place. - -@item -Use the table description file to create new (empty) data and index files: - -@example -shell> mysql db_name -mysql> SET AUTOCOMMIT=1; -mysql> TRUNCATE TABLE table_name; -mysql> quit -@end example - -If your SQL version doesn't have @code{TRUNCATE TABLE}, use @code{DELETE FROM -table_name} instead. - -@item -Copy the old datafile back onto the newly created datafile. -(Don't just move the old file back onto the new file; you want to retain -a copy in case something goes wrong.) -@end enumerate - -Go back to Stage 2. @code{myisamchk -r -q} should work now. (This shouldn't -be an endless loop.) - -As of @code{MySQL} 4.0.2 you can also use @code{REPAIR ... USE_FRM} -which performs the whole procedure automatically. - -@noindent -@strong{Stage 4: Very difficult repair} - -You should reach this stage only if the description file has also -crashed. That should never happen, because the description file isn't changed -after the table is created: - -@enumerate -@item -Restore the description file from a backup and go back to Stage 3. You can -also restore the index file and go back to Stage 2. In the latter case, you -should start with @code{myisamchk -r}. - -@item -If you don't have a backup but know exactly how the table was created, create -a copy of the table in another database. Remove the new datafile, then move -the description and index files from the other database to your crashed -database. This gives you new description and index files, but leaves -the datafile alone. Go back to Stage 2 and attempt to reconstruct -the index file. -@end enumerate - - -@node Optimisation, , Repair, Table maintenance -@subsubsection Table Optimisation - -@cindex tables, optimising -@cindex optimising, tables - -To coalesce fragmented records and eliminate wasted space resulting from -deleting or updating records, run @code{myisamchk} in recovery mode: - -@example -shell> myisamchk -r tbl_name -@end example - -You can optimise a table in the same way using the SQL @code{OPTIMIZE TABLE} -statement. @code{OPTIMIZE TABLE} does a repair of the table and a key -analysis, and also sorts the index tree to give faster key lookups. -There is also no possibility of unwanted interaction between a utility -and the server, because the server does all the work when you use -@code{OPTIMIZE TABLE}. @xref{OPTIMIZE TABLE}. - -@code{myisamchk} also has a number of other options you can use to improve -the performance of a table: - -@itemize -@item @code{-S}, @code{--sort-index} -@item @code{-R index_num}, @code{--sort-records=index_num} -@item @code{-a}, @code{--analyze} -@end itemize - -For a full description of the option. @xref{myisamchk syntax}. - - -@node Maintenance regimen, Table-info, Table maintenance, Disaster Prevention -@subsection Setting Up a Table Maintenance Regimen - -@cindex maintaining, tables -@cindex tables, maintenance regimen - -Starting with MySQL Version 3.23.13, you can check MyISAM -tables with the @code{CHECK TABLE} command. @xref{CHECK TABLE}. You can -repair tables with the @code{REPAIR TABLE} command. @xref{REPAIR TABLE}. - -It is a good idea to perform table checks on a regular basis rather than -waiting for problems to occur. For maintenance purposes, you can use -@code{myisamchk -s} to check tables. The @code{-s} option (short for -@code{--silent}) causes @code{myisamchk} to run in silent mode, printing -messages only when errors occur. - -@tindex .pid (process ID) file -It's also a good idea to check tables when the server starts up. -For example, whenever the machine has done a reboot in the middle of an -update, you usually need to check all the tables that could have been -affected. (This is an ``expected crashed table''.) You could add a test to -@code{safe_mysqld} that runs @code{myisamchk} to check all tables that have -been modified during the last 24 hours if there is an old @file{.pid} -(process ID) file left after a reboot. (The @file{.pid} file is created by -@code{mysqld} when it starts up and removed when it terminates normally. The -presence of a @file{.pid} file at system startup time indicates that -@code{mysqld} terminated abnormally.) - -An even better test would be to check any table whose last-modified time -is more recent than that of the @file{.pid} file. - -You should also check your tables regularly during normal system -operation. At MySQL AB, we run a @code{cron} job to check all -our important tables once a week, using a line like this in a @file{crontab} -file: - -@example -35 0 * * 0 /path/to/myisamchk --fast --silent /path/to/datadir/*/*.MYI -@end example - -This prints out information about crashed tables so we can examine and repair -them when needed. - -As we haven't had any unexpectedly crashed tables (tables that become -corrupted for reasons other than hardware trouble) -for a couple of years now (this is really true), once a week is -more than enough for us. - -We recommend that to start with, you execute @code{myisamchk -s} each -night on all tables that have been updated during the last 24 hours, -until you come to trust MySQL as much as we do. - -@cindex tables, defragment -Normally you don't need to maintain MySQL tables that much. If -you are changing tables with dynamic size rows (tables with @code{VARCHAR}, -@code{BLOB} or @code{TEXT} columns) or have tables with many deleted rows -you may want to from time to time (once a month?) defragment/reclaim space -from the tables. - -You can do this by using @code{OPTIMIZE TABLE} on the tables in question or -if you can take the @code{mysqld} server down for a while do: - -@example -isamchk -r --silent --sort-index -O sort_buffer_size=16M */*.ISM -myisamchk -r --silent --sort-index -O sort_buffer_size=16M */*.MYI -@end example - - -@node Table-info, , Maintenance regimen, Disaster Prevention -@subsection Getting Information About a Table - -@cindex tables, information - -To get a description of a table or statistics about it, use the commands shown -here. We explain some of the information in more detail later: - -@itemize @bullet -@item myisamchk -d tbl_name -Runs @code{myisamchk} in ``describe mode'' to produce a description of -your table. If you start the MySQL server using the -@code{--skip-external-locking} option, @code{myisamchk} may report an error -for a table that is updated while it runs. However, because @code{myisamchk} -doesn't change the table in describe mode, there isn't any risk of -destroying data. - -@item myisamchk -d -v tbl_name -To produce more information about what @code{myisamchk} is doing, add @code{-v} -to tell it to run in verbose mode. - -@item myisamchk -eis tbl_name -Shows only the most important information from a table. It is slow because it -must read the whole table. - -@item myisamchk -eiv tbl_name -This is like @code{-eis}, but tells you what is being done. -@end itemize - -@cindex examples, @code{myisamchk} output -@cindex @code{myisamchk}, example output -Example of @code{myisamchk -d} output: -@example -MyISAM file: company.MYI -Record format: Fixed length -Data records: 1403698 Deleted blocks: 0 -Recordlength: 226 - -table description: -Key Start Len Index Type -1 2 8 unique double -2 15 10 multip. text packed stripped -3 219 8 multip. double -4 63 10 multip. text packed stripped -5 167 2 multip. unsigned short -6 177 4 multip. unsigned long -7 155 4 multip. text -8 138 4 multip. unsigned long -9 177 4 multip. unsigned long - 193 1 text -@end example - -Example of @code{myisamchk -d -v} output: -@example -MyISAM file: company -Record format: Fixed length -File-version: 1 -Creation time: 1999-10-30 12:12:51 -Recover time: 1999-10-31 19:13:01 -Status: checked -Data records: 1403698 Deleted blocks: 0 -Datafile parts: 1403698 Deleted data: 0 -Datafilepointer (bytes): 3 Keyfile pointer (bytes): 3 -Max datafile length: 3791650815 Max keyfile length: 4294967294 -Recordlength: 226 - -table description: -Key Start Len Index Type Rec/key Root Blocksize -1 2 8 unique double 1 15845376 1024 -2 15 10 multip. text packed stripped 2 25062400 1024 -3 219 8 multip. double 73 40907776 1024 -4 63 10 multip. text packed stripped 5 48097280 1024 -5 167 2 multip. unsigned short 4840 55200768 1024 -6 177 4 multip. unsigned long 1346 65145856 1024 -7 155 4 multip. text 4995 75090944 1024 -8 138 4 multip. unsigned long 87 85036032 1024 -9 177 4 multip. unsigned long 178 96481280 1024 - 193 1 text -@end example - -Example of @code{myisamchk -eis} output: -@example -Checking MyISAM file: company -Key: 1: Keyblocks used: 97% Packed: 0% Max levels: 4 -Key: 2: Keyblocks used: 98% Packed: 50% Max levels: 4 -Key: 3: Keyblocks used: 97% Packed: 0% Max levels: 4 -Key: 4: Keyblocks used: 99% Packed: 60% Max levels: 3 -Key: 5: Keyblocks used: 99% Packed: 0% Max levels: 3 -Key: 6: Keyblocks used: 99% Packed: 0% Max levels: 3 -Key: 7: Keyblocks used: 99% Packed: 0% Max levels: 3 -Key: 8: Keyblocks used: 99% Packed: 0% Max levels: 3 -Key: 9: Keyblocks used: 98% Packed: 0% Max levels: 4 -Total: Keyblocks used: 98% Packed: 17% - -Records: 1403698 M.recordlength: 226 -Packed: 0% -Recordspace used: 100% Empty space: 0% -Blocks/Record: 1.00 -Record blocks: 1403698 Delete blocks: 0 -Recorddata: 317235748 Deleted data: 0 -Lost space: 0 Linkdata: 0 - -User time 1626.51, System time 232.36 -Maximum resident set size 0, Integral resident set size 0 -Non physical pagefaults 0, Physical pagefaults 627, Swaps 0 -Blocks in 0 out 0, Messages in 0 out 0, Signals 0 -Voluntary context switches 639, Involuntary context switches 28966 -@end example - -Example of @code{myisamchk -eiv} output: -@example -Checking MyISAM file: company -Data records: 1403698 Deleted blocks: 0 -- check file-size -- check delete-chain -block_size 1024: -index 1: -index 2: -index 3: -index 4: -index 5: -index 6: -index 7: -index 8: -index 9: -No recordlinks -- check index reference -- check data record references index: 1 -Key: 1: Keyblocks used: 97% Packed: 0% Max levels: 4 -- check data record references index: 2 -Key: 2: Keyblocks used: 98% Packed: 50% Max levels: 4 -- check data record references index: 3 -Key: 3: Keyblocks used: 97% Packed: 0% Max levels: 4 -- check data record references index: 4 -Key: 4: Keyblocks used: 99% Packed: 60% Max levels: 3 -- check data record references index: 5 -Key: 5: Keyblocks used: 99% Packed: 0% Max levels: 3 -- check data record references index: 6 -Key: 6: Keyblocks used: 99% Packed: 0% Max levels: 3 -- check data record references index: 7 -Key: 7: Keyblocks used: 99% Packed: 0% Max levels: 3 -- check data record references index: 8 -Key: 8: Keyblocks used: 99% Packed: 0% Max levels: 3 -- check data record references index: 9 -Key: 9: Keyblocks used: 98% Packed: 0% Max levels: 4 -Total: Keyblocks used: 9% Packed: 17% - -- check records and index references -[LOTS OF ROW NUMBERS DELETED] - -Records: 1403698 M.recordlength: 226 Packed: 0% -Recordspace used: 100% Empty space: 0% Blocks/Record: 1.00 -Record blocks: 1403698 Delete blocks: 0 -Recorddata: 317235748 Deleted data: 0 -Lost space: 0 Linkdata: 0 - -User time 1639.63, System time 251.61 -Maximum resident set size 0, Integral resident set size 0 -Non physical pagefaults 0, Physical pagefaults 10580, Swaps 0 -Blocks in 4 out 0, Messages in 0 out 0, Signals 0 -Voluntary context switches 10604, Involuntary context switches 122798 -@end example - -Here are the sizes of the data and index files for the table used in the -preceding examples: - -@example --rw-rw-r-- 1 monty tcx 317235748 Jan 12 17:30 company.MYD --rw-rw-r-- 1 davida tcx 96482304 Jan 12 18:35 company.MYM -@end example - -Explanations for the types of information @code{myisamchk} produces are -given here. The ``keyfile'' is the index file. ``Record'' and ``row'' -are synonymous: - -@itemize @bullet -@item ISAM file -Name of the ISAM (index) file. - -@item Isam-version -Version of ISAM format. Currently always 2. - -@item Creation time -When the datafile was created. - -@item Recover time -When the index/datafile was last reconstructed. - -@item Data records -How many records are in the table. - -@item Deleted blocks -How many deleted blocks still have reserved space. -You can optimise your table to minimise this space. -@xref{Optimisation}. - -@item Data file: Parts -For dynamic record format, this indicates how many data blocks there are. For -an optimised table without fragmented records, this is the same as @code{Data -records}. - -@item Deleted data -How many bytes of non-reclaimed deleted data there are. -You can optimise your table to minimise this space. -@xref{Optimisation}. - -@item Data file pointer -The size of the datafile pointer, in bytes. It is usually 2, 3, 4, or 5 -bytes. Most tables manage with 2 bytes, but this cannot be controlled -from MySQL yet. For fixed tables, this is a record address. For -dynamic tables, this is a byte address. - -@item Keyfile pointer -The size of the index file pointer, in bytes. It is usually 1, 2, or 3 -bytes. Most tables manage with 2 bytes, but this is calculated -automatically by MySQL. It is always a block address. - -@item Max datafile length -How long the table's datafile (@file{.MYD} file) can become, in bytes. - -@item Max keyfile length -How long the table's key file (@file{.MYI} file) can become, in bytes. - -@item Recordlength -How much space each record takes, in bytes. - -@item Record format -The format used to store table rows. -The examples shown above use @code{Fixed length}. -Other possible values are @code{Compressed} and @code{Packed}. - -@item table description -A list of all keys in the table. For each key, some low-level information -is presented: - -@itemize @minus -@item Key -This key's number. - -@item Start -Where in the record this index part starts. - -@item Len -How long this index part is. For packed numbers, this should always be -the full length of the column. For strings, it may be shorter than the full -length of the indexed column, because you can index a prefix of a string -column. - -@item Index -@code{unique} or @code{multip.} (multiple). Indicates whether one value -can exist multiple times in this index. - -@item Type -What data-type this index part has. This is an ISAM data-type -with the options @code{packed}, @code{stripped} or @code{empty}. - -@item Root -Address of the root index block. - -@item Blocksize -The size of each index block. By default this is 1024, but the value may be -changed at compile time. - -@item Rec/key -This is a statistical value used by the optimiser. It tells how many -records there are per value for this key. A unique key always has a -value of 1. This may be updated after a table is loaded (or greatly -changed) with @code{myisamchk -a}. If this is not updated at all, a default -value of 30 is given. -@end itemize - -@item -In the first example above, the 9th key is a multi-part key with two parts. - -@item Keyblocks used -What percentage of the keyblocks are used. Because the table used in the -examples had just been reorganised with @code{myisamchk}, the values are very -high (very near the theoretical maximum). - -@item Packed -MySQL tries to pack keys with a common suffix. This can only be used -for @code{CHAR}/@code{VARCHAR}/@code{DECIMAL} keys. For long strings like -names, this can significantly reduce the space used. In the third example -above, the 4th key is 10 characters long and a 60% reduction in space is -achieved. - -@item Max levels -How deep the B-tree for this key is. Large tables with long keys get high -values. - -@item Records -How many rows are in the table. - -@item M.recordlength -The average record length. For tables with fixed-length records, this is the -exact record length. - -@item Packed -MySQL strips spaces from the end of strings. The @code{Packed} -value indicates the percentage of savings achieved by doing this. - -@item Recordspace used -What percentage of the datafile is used. - -@item Empty space -What percentage of the datafile is unused. - -@item Blocks/Record -Average number of blocks per record (that is, how many links a fragmented -record is composed of). This is always 1.0 for fixed-format tables. This -value should stay as close to 1.0 as possible. If it gets too big, you can -reorganise the table with @code{myisamchk}. -@xref{Optimisation}. - -@item Recordblocks -How many blocks (links) are used. For fixed format, this is the same as the number -of records. - -@item Deleteblocks -How many blocks (links) are deleted. - -@item Recorddata -How many bytes in the datafile are used. - -@item Deleted data -How many bytes in the datafile are deleted (unused). - -@item Lost space -If a record is updated to a shorter length, some space is lost. This is -the sum of all such losses, in bytes. - -@item Linkdata -When the dynamic table format is used, record fragments are linked with -pointers (4 to 7 bytes each). @code{Linkdata} is the sum of the amount of -storage used by all such pointers. -@end itemize - -If a table has been compressed with @code{myisampack}, @code{myisamchk --d} prints additional information about each table column. See -@ref{myisampack, , @code{myisampack}}, for an example of this -information and a description of what it means. - - -@node Database Administration, Localisation, Disaster Prevention, MySQL Database Administration -@section Database Administration Language Reference - - -@menu -* OPTIMIZE TABLE:: @code{OPTIMIZE TABLE} Syntax -* ANALYZE TABLE:: @code{ANALYZE TABLE} Syntax -* FLUSH:: @code{FLUSH} Syntax -* RESET:: @code{RESET} Syntax -* KILL:: @code{KILL} Syntax -* SHOW:: @code{SHOW} Syntax -@end menu - - -@node OPTIMIZE TABLE, ANALYZE TABLE, Database Administration, Database Administration -@subsection @code{OPTIMIZE TABLE} Syntax - -@findex OPTIMIZE TABLE - -@cindex tables, defragmenting -@cindex tables, fragmentation - -@example -OPTIMIZE TABLE tbl_name[,tbl_name]... -@end example - -@code{OPTIMIZE TABLE} should be used if you have deleted a large part of a -table or if you have made many changes to a table with variable-length rows -(tables that have @code{VARCHAR}, @code{BLOB}, or @code{TEXT} columns). -Deleted records are maintained in a linked list and subsequent @code{INSERT} -operations reuse old record positions. You can use @code{OPTIMIZE TABLE} to -reclaim the unused space and to defragment the datafile. - -For the moment, @code{OPTIMIZE TABLE} works only on @code{MyISAM} and -@code{BDB} tables. For @code{BDB} tables, @code{OPTIMIZE TABLE} is -currently mapped to @code{ANALYZE TABLE}. -@xref{ANALYZE TABLE, , @code{ANALYZE TABLE}}. - -You can get @code{OPTIMIZE TABLE} to work on other table types by starting -@code{mysqld} with @code{--skip-new} or @code{--safe-mode}, but in this -case @code{OPTIMIZE TABLE} is just mapped to @code{ALTER TABLE}. - -@code{OPTIMIZE TABLE} works the following way: -@itemize @bullet -@item -If the table has deleted or split rows, repair the table. -@item -If the index pages are not sorted, sort them. -@item -If the statistics are not up to date (and the repair couldn't be done -by sorting the index), update them. -@end itemize - -@code{OPTIMIZE TABLE} for a @code{MyISAM} table is equivalent to running -@code{myisamchk --quick --check-only-changed --sort-index --analyze} -on the table. - -Note that the table is locked during the time @code{OPTIMIZE TABLE} is -running! - - -@node ANALYZE TABLE, FLUSH, OPTIMIZE TABLE, Database Administration -@subsection @code{ANALYZE TABLE} Syntax - -@findex ANALYZE TABLE - -@example -ANALYZE TABLE tbl_name[,tbl_name...] -@end example - -Analyse and store the key distribution for the table. During the -analysis, the table is locked with a read lock. This works on -@code{MyISAM} and @code{BDB} tables. - -This is equivalent to running @code{myisamchk -a} on the table. - -MySQL uses the stored key distribution to decide in which order -tables should be joined when one does a join on something else than a -constant. - -The command returns a table with the following columns: - -@multitable @columnfractions .15 .40 -@item @strong{Column} @tab @strong{Value} -@item Table @tab Table name -@item Op @tab Always ``analyze'' -@item Msg_type @tab One of @code{status}, @code{error}, @code{info} or @code{warning}. -@item Msg_text @tab The message. -@end multitable - -You can check the stored key distribution with the @code{SHOW INDEX} command. -@xref{SHOW DATABASE INFO}. - -If the table hasn't changed since the last @code{ANALYZE TABLE} command, -the table will not be analysed again. - - -@node FLUSH, RESET, ANALYZE TABLE, Database Administration -@subsection @code{FLUSH} Syntax - -@findex FLUSH - -@cindex @code{mysqladmin} -@cindex clearing, caches -@cindex caches, clearing - -@example -FLUSH flush_option [,flush_option] ... -@end example - -You should use the @code{FLUSH} command if you want to clear some of the -internal caches MySQL uses. To execute @code{FLUSH}, you must have -the @code{RELOAD} privilege. - -@code{flush_option} can be any of the following: - -@multitable @columnfractions .25 .75 -@item @strong{Option} @tab @strong{Description} - -@item @code{HOSTS} @tab Empties the host cache tables. You should flush the -host tables if some of your hosts change IP number or if you get the -error message @code{Host ... is blocked}. When more than -@code{max_connect_errors} errors occur in a row for a given host while -connection to the MySQL server, MySQL assumes -something is wrong and blocks the host from further connection requests. -Flushing the host tables allows the host to attempt to connect -again. @xref{Blocked host}. You can start @code{mysqld} with -@code{-O max_connect_errors=999999999} to avoid this error message. - -@item @code{DES_KEY_FILE} @tab Reloads the DES keys from the file that was -specified with the @code{--des-key-file} option at server startup time. - -@item @code{LOGS} @tab Closes and reopens all log files. -If you have specified the update log file or a binary log file without -an extension, the extension number of the log file will be incremented -by one relative to the previous file. If you have used an extension in -the file name, MySQL will close and reopen the update log file. -@xref{Update log}. This is the same thing as sending the @code{SIGHUP} -signal to the @code{mysqld} server. - -@item @code{PRIVILEGES} @tab Reloads the privileges from the grant tables in -the @code{mysql} database. - -@item @code{QUERY CACHE} @tab Defragment the query cache to better utilise its -memory. This command will not remove any queries from the cache, unlike -@code{RESET QUERY CACHE}. - -@item @code{TABLES} @tab Closes all open tables and force all tables in use to be closed. This also flushes the query cache. - -@item @code{[TABLE | TABLES] tbl_name [,tbl_name...]} @tab Flushes only the given tables. - -@item @code{TABLES WITH READ LOCK} @tab Closes all open tables and locks all tables for all databases with a read lock until you execute @code{UNLOCK TABLES}. This is very convenient way to get backups if you have a filesystem, like Veritas, that can take snapshots in time. - -@item @code{STATUS} @tab Resets most status variables to zero. This is something one should only use when debugging a query. - -@item @code{USER_RESOURCES} @tab Resets all user resources to zero. This will enable blocked users to login again. @xref{User resources}. -@end multitable - -You can also access each of the commands shown above with the @code{mysqladmin} -utility, using the @code{flush-hosts}, @code{flush-logs}, @code{reload}, -or @code{flush-tables} commands. - -Take also a look at the @code{RESET} command used with replication. -@xref{RESET, , @code{RESET}}. - -@node RESET, KILL, FLUSH, Database Administration -@subsection @code{RESET} Syntax - -@example -RESET reset_option [,reset_option] ... -@end example - -The @code{RESET} command is used to clear things. It also acts as an stronger -version of the @code{FLUSH} command. @xref{FLUSH, , @code{FLUSH}}. - -To execute @code{RESET}, you must have the @code{RELOAD} privilege. - -@multitable @columnfractions .25 .75 -@item @strong{Option} @tab @strong{Description} - -@item @code{MASTER} @tab Deletes all binary logs listed in the index file, resetting the binlog -index file to be empty. In pre-3.23.26 versions, @code{FLUSH MASTER} (Master) - -@item @code{SLAVE} @tab Makes the slave forget its replication position in the master -logs. In pre 3.23.26 versions the command was called -@code{FLUSH SLAVE}(Slave) - -@item @code{QUERY CACHE} @tab Removes all query results from the query cache. -@end multitable - -@node KILL, SHOW, RESET, Database Administration -@subsection @code{KILL} Syntax - -@findex KILL - -@cindex @code{mysqladmin} - -@example -KILL thread_id -@end example - -Each connection to @code{mysqld} runs in a separate thread. You can see -which threads are running with the @code{SHOW PROCESSLIST} command and kill -a thread with the @code{KILL thread_id} command. - -If you have the @code{PROCESS} privilege, you can see all threads. -If you have the @code{SUPER} privilege, you can kill all threads. -Otherwise, you can only see and kill your own threads. - -You can also use the @code{mysqladmin processlist} and @code{mysqladmin kill} -commands to examine and kill threads. - -When you do a @code{KILL}, a thread-specific @code{kill flag} is set for -the thread. - -In most cases it may take some time for the thread to die as the kill -flag is only checked at specific intervals. - -@itemize @bullet -@item -In @code{SELECT}, @code{ORDER BY} and @code{GROUP BY} loops, the flag is -checked after reading a block of rows. If the kill flag is set the -statement is aborted -@item -When doing an @code{ALTER TABLE} the kill flag is checked before each block of -rows are read from the original table. If the kill flag was set the command -is aborted and the temporary table is deleted. -@item -When doing an @code{UPDATE TABLE} and @code{DELETE TABLE}, the kill flag -is checked after each block read and after each updated or delete -row. If the kill flag is set the statement is aborted. Note that if you -are not using transactions, the changes will not be rolled back! -@item -@code{GET_LOCK()} will abort with @code{NULL}. -@item -An @code{INSERT DELAYED} thread will quickly flush all rows it has in -memory and die. -@item -If the thread is in the table lock handler (state: @code{Locked}), -the table lock will be quickly aborted. -@item -If the thread is waiting for free disk space in a @code{write} call, the -write is aborted with an disk full error message. -@end itemize - -@node SHOW, , KILL, Database Administration -@subsection @code{SHOW} Syntax - -@c FIX more index hits needed - -@findex SHOW DATABASE INFO -@findex SHOW DATABASES -@findex SHOW TABLES -@findex SHOW COLUMNS -@findex SHOW FIELDS -@findex SHOW INDEX -@findex SHOW KEYS -@findex SHOW STATUS -@findex SHOW VARIABLES -@findex SHOW PROCESSLIST -@findex SHOW TABLE STATUS -@findex SHOW GRANTS -@findex SHOW CREATE TABLE -@findex SHOW MASTER STATUS -@findex SHOW MASTER LOGS -@findex SHOW SLAVE STATUS - -@example - SHOW DATABASES [LIKE wild] -or SHOW [OPEN] TABLES [FROM db_name] [LIKE wild] -or SHOW [FULL] COLUMNS FROM tbl_name [FROM db_name] [LIKE wild] -or SHOW INDEX FROM tbl_name [FROM db_name] -or SHOW TABLE STATUS [FROM db_name] [LIKE wild] -or SHOW STATUS [LIKE wild] -or SHOW VARIABLES [LIKE wild] -or SHOW LOGS -or SHOW [FULL] PROCESSLIST -or SHOW GRANTS FOR user -or SHOW CREATE TABLE table_name -or SHOW MASTER STATUS -or SHOW MASTER LOGS -or SHOW SLAVE STATUS -@end example - -@code{SHOW} provides information about databases, tables, columns, or -status information about the server. If the @code{LIKE wild} part is -used, the @code{wild} string can be a string that uses the SQL @samp{%} -and @samp{_} wildcard characters. - -@menu -* SHOW DATABASE INFO:: Retrieving information about Database, Tables, Columns, and Indexes -* SHOW TABLE STATUS:: @code{SHOW TABLE STATUS} -* SHOW STATUS:: @code{SHOW STATUS} -* SHOW VARIABLES:: @code{SHOW VARIABLES} -* SHOW LOGS:: @code{SHOW LOGS} -* SHOW PROCESSLIST:: @code{SHOW PROCESSLIST} -* SHOW GRANTS:: @code{SHOW GRANTS} -* SHOW CREATE TABLE:: @code{SHOW CREATE TABLE} -@end menu - - -@node SHOW DATABASE INFO, SHOW TABLE STATUS, SHOW, SHOW -@subsubsection Retrieving information about Database, Tables, Columns, and Indexes - -@cindex displaying, information, @code{SHOW} - -You can use @code{db_name.tbl_name} as an alternative to the @code{tbl_name -FROM db_name} syntax. These two statements are equivalent: - -@example -mysql> SHOW INDEX FROM mytable FROM mydb; -mysql> SHOW INDEX FROM mydb.mytable; -@end example - -@code{SHOW DATABASES} lists the databases on the MySQL server host. -You can also get this list using the @code{mysqlshow} command line tool. -In version 4.0.2 you will only see those databases for which you have some -kind of privilege, if you don't have the global @code{SHOW DATABASES} -privilege. - -@code{SHOW TABLES} lists the tables in a given database. You can also -get this list using the @code{mysqlshow db_name} command. - -@strong{Note}: if a user doesn't have any privileges for a table, the table -will not show up in the output from @code{SHOW TABLES} or @code{mysqlshow -db_name}. - -@code{SHOW OPEN TABLES} lists the tables that are currently open in -the table cache. @xref{Table cache}. The @code{Comment} field tells -how many times the table is @code{cached} and @code{in_use}. - -@code{SHOW COLUMNS} lists the columns in a given table. If you specify -the @code{FULL} option, you will also get the privileges you have for -each column. If the column types are different from what you expect them to -be based on a @code{CREATE TABLE} statement, note that MySQL -sometimes changes column types. @xref{Silent column changes}. - -The @code{DESCRIBE} statement provides information similar to -@code{SHOW COLUMNS}. -@xref{DESCRIBE, , @code{DESCRIBE}}. - -@code{SHOW FIELDS} is a synonym for @code{SHOW COLUMNS}, and -@code{SHOW KEYS} is a synonym for @code{SHOW INDEX}. You can also -list a table's columns or indexes with @code{mysqlshow db_name tbl_name} -or @code{mysqlshow -k db_name tbl_name}. - -@code{SHOW INDEX} returns the index information in a format that closely -resembles the @code{SQLStatistics} call in ODBC. The following columns -are returned: - -@multitable @columnfractions .15 .55 -@item @strong{Column} @tab @strong{Meaning} -@item @code{Table} @tab Name of the table. -@item @code{Non_unique} @tab 0 if the index can't contain duplicates. -@item @code{Key_name} @tab Name of the index. -@item @code{Seq_in_index} @tab Column sequence number in index, - starting with 1. -@item @code{Column_name} @tab Column name. -@item @code{Collation} @tab How the column is sorted in the index. - In MySQL, this can have values - @samp{A} (Ascending) or @code{NULL} (Not - sorted). -@item @code{Cardinality} @tab Number of unique values in the index. - This is updated by running - @code{isamchk -a}. -@item @code{Sub_part} @tab Number of indexed characters if the - column is only partly indexed. - @code{NULL} if the entire key is indexed. -@item @code{Null} @tab Contains 'YES' if the column may contain @code{NULL}. -@item @code{Index_type} @tab Index method used. -@item @code{Comment} @tab Various remarks. For now, it tells -in MySQL < 4.0.2 whether index is @code{FULLTEXT} or not. -@end multitable - -Note that as the @code{Cardinality} is counted based on statistics -stored as integers, it's not necessarily accurate for small tables. - -The @code{Null} and @code{Index_type} columns were added in MySQL 4.0.2. - -@node SHOW TABLE STATUS, SHOW STATUS, SHOW DATABASE INFO, SHOW -@subsubsection @code{SHOW TABLE STATUS} - -@cindex displaying, table status -@cindex tables, displaying status -@cindex status, tables - -@example -SHOW TABLE STATUS [FROM db_name] [LIKE wild] -@end example - -@code{SHOW TABLE STATUS} (new in Version 3.23) works likes @code{SHOW -STATUS}, but provides a lot of information about each table. You can -also get this list using the @code{mysqlshow --status db_name} command. -The following columns are returned: - -@multitable @columnfractions .20 .70 -@item @strong{Column} @tab @strong{Meaning} -@item @code{Name} @tab Name of the table. -@item @code{Type} @tab Type of table. @xref{Table types}. -@item @code{Row_format} @tab The row storage format (Fixed, Dynamic, or Compressed). -@item @code{Rows} @tab Number of rows. -@item @code{Avg_row_length} @tab Average row length. -@item @code{Data_length} @tab Length of the datafile. -@item @code{Max_data_length} @tab Max length of the datafile. -@item @code{Index_length} @tab Length of the index file. -@item @code{Data_free} @tab Number of allocated but not used bytes. -@item @code{Auto_increment} @tab Next autoincrement value. -@item @code{Create_time} @tab When the table was created. -@item @code{Update_time} @tab When the datafile was last updated. -@item @code{Check_time} @tab When the table was last checked. -@item @code{Create_options} @tab Extra options used with @code{CREATE TABLE}. -@item @code{Comment} @tab The comment used when creating the table (or some information why MySQL couldn't access the table information). -@end multitable - -@code{InnoDB} tables will report the free space in the tablespace -in the table comment. - - -@node SHOW STATUS, SHOW VARIABLES, SHOW TABLE STATUS, SHOW -@subsubsection @code{SHOW STATUS} - -@cindex @code{mysqladmin} -@code{SHOW STATUS} provides server status information -(like @code{mysqladmin extended-status}). The output resembles that shown -here, though the format and numbers probably differ: - -@example -+--------------------------+------------+ -| Variable_name | Value | -+--------------------------+------------+ -| Aborted_clients | 0 | -| Aborted_connects | 0 | -| Bytes_received | 155372598 | -| Bytes_sent | 1176560426 | -| Connections | 30023 | -| Created_tmp_disk_tables | 0 | -| Created_tmp_tables | 8340 | -| Created_tmp_files | 60 | -| Delayed_insert_threads | 0 | -| Delayed_writes | 0 | -| Delayed_errors | 0 | -| Flush_commands | 1 | -| Handler_delete | 462604 | -| Handler_read_first | 105881 | -| Handler_read_key | 27820558 | -| Handler_read_next | 390681754 | -| Handler_read_prev | 6022500 | -| Handler_read_rnd | 30546748 | -| Handler_read_rnd_next | 246216530 | -| Handler_update | 16945404 | -| Handler_write | 60356676 | -| Key_blocks_used | 14955 | -| Key_read_requests | 96854827 | -| Key_reads | 162040 | -| Key_write_requests | 7589728 | -| Key_writes | 3813196 | -| Max_used_connections | 0 | -| Not_flushed_key_blocks | 0 | -| Not_flushed_delayed_rows | 0 | -| Open_tables | 1 | -| Open_files | 2 | -| Open_streams | 0 | -| Opened_tables | 44600 | -| Questions | 2026873 | -| Select_full_join | 0 | -| Select_full_range_join | 0 | -| Select_range | 99646 | -| Select_range_check | 0 | -| Select_scan | 30802 | -| Slave_running | OFF | -| Slave_open_temp_tables | 0 | -| Slow_launch_threads | 0 | -| Slow_queries | 0 | -| Sort_merge_passes | 30 | -| Sort_range | 500 | -| Sort_rows | 30296250 | -| Sort_scan | 4650 | -| Table_locks_immediate | 1920382 | -| Table_locks_waited | 0 | -| Threads_cached | 0 | -| Threads_created | 30022 | -| Threads_connected | 1 | -| Threads_running | 1 | -| Uptime | 80380 | -+--------------------------+------------+ -@end example - -@cindex variables, status -The status variables listed above have the following meaning: - -@multitable @columnfractions .30 .70 -@item @strong{Variable} @tab @strong{Meaning} -@item @code{Aborted_clients} @tab Number of connections aborted because the client died without closing the connection properly. @xref{Communication errors}. -@item @code{Aborted_connects} @tab Number of tries to connect to the MySQL server that failed. @xref{Communication errors}. -@item @code{Bytes_received} @tab Number of bytes received from all clients. -@item @code{Bytes_sent} @tab Number of bytes sent to all clients. -@item @code{Com_xxx} @tab Number of times each xxx command has been executed. -@item @code{Connections} @tab Number of connection attempts to the MySQL server. -@item @code{Created_tmp_disk_tables} @tab Number of implicit temporary tables on disk created while executing statements. -@item @code{Created_tmp_tables} @tab Number of implicit temporary tables in memory created while executing statements. -@item @code{Created_tmp_files} @tab How many temporary files @code{mysqld} has created. -@item @code{Delayed_insert_threads} @tab Number of delayed insert handler threads in use. -@item @code{Delayed_writes} @tab Number of rows written with @code{INSERT DELAYED}. -@item @code{Delayed_errors} @tab Number of rows written with @code{INSERT DELAYED} for which some error occurred (probably @code{duplicate key}). -@item @code{Flush_commands} @tab Number of executed @code{FLUSH} commands. -@item @code{Handler_commit} @tab Number of internal @code{COMMIT} commands. -@item @code{Handler_delete} @tab Number of times a row was deleted from a table. -@item @code{Handler_read_first} @tab Number of times the first entry was read from an index. -If this is high, it suggests that the server is doing a lot of full index scans, for example, -@code{SELECT col1 FROM foo}, assuming that col1 is indexed. -@item @code{Handler_read_key} @tab Number of requests to read a row based on a key. If this -is high, it is a good indication that your queries and tables are properly indexed. -@item @code{Handler_read_next} @tab Number of requests to read next row in key order. This -will be incremented if you are querying an index column with a range constraint. This also -will be incremented if you are doing an index scan. -@item @code{Handler_read_prev} @tab Number of requests to read previous row in key order. This is mainly used to optimise @code{ORDER BY ... DESC}. -@item @code{Handler_read_rnd} @tab Number of requests to read a row based on a fixed position. -This will be high if you are doing a lot of queries that require sorting of the result. -@item @code{Handler_read_rnd_next} @tab Number of requests to read the next row in the datafile. -This will be high if you are doing a lot of table scans. Generally this suggests that your tables -are not properly indexed or that your queries are not written to take advantage of the indexes you -have. -@item @code{Handler_rollback} @tab Number of internal @code{ROLLBACK} commands. -@item @code{Handler_update} @tab Number of requests to update a row in a table. -@item @code{Handler_write} @tab Number of requests to insert a row in a table. -@item @code{Key_blocks_used} @tab The number of used blocks in the key cache. -@item @code{Key_read_requests} @tab The number of requests to read a key block from the cache. -@item @code{Key_reads} @tab The number of physical reads of a key block from disk. -@item @code{Key_write_requests} @tab The number of requests to write a key block to the cache. -@item @code{Key_writes} @tab The number of physical writes of a key block to disk. -@item @code{Max_used_connections} @tab The maximum number of connections in use simultaneously. -@item @code{Not_flushed_key_blocks} @tab Keys blocks in the key cache that has changed but hasn't yet been flushed to disk. -@item @code{Not_flushed_delayed_rows} @tab Number of rows waiting to be written in @code{INSERT DELAY} queues. -@item @code{Open_tables} @tab Number of tables that are open. -@item @code{Open_files} @tab Number of files that are open. -@item @code{Open_streams} @tab Number of streams that are open (used mainly for logging). -@item @code{Opened_tables} @tab Number of tables that have been opened. -@item @code{Rpl_status} @tab Status of failsafe replication. (Not yet in use). -@item @code{Select_full_join} @tab Number of joins without keys (If this is 0, you should carefully check the index of your tables). -@item @code{Select_full_range_join} @tab Number of joins where we used a range search on reference table. -@item @code{Select_range} @tab Number of joins where we used ranges on the first table. (It's normally not critical even if this is big.) -@item @code{Select_scan} @tab Number of joins where we did a full scann of the first table. -@item @code{Select_range_check} @tab Number of joins without keys where we check for key usage after each row (If this is 0, you should carefully check the index of your tables). -@item @code{Questions} @tab Number of queries sent to the server. -@item @code{Slave_open_temp_tables} @tab Number of temporary tables currently -open by the slave thread -@item @code{Slave_running} @tab Is @code{ON} if this is a slave that is connected to a master. -@item @code{Slow_launch_threads} @tab Number of threads that have taken more than @code{slow_launch_time} to create. -@item @code{Slow_queries} @tab Number of queries that have taken more than @code{long_query_time}. @xref{Slow query log}. -@item @code{Sort_merge_passes} @tab Number of merges passes the sort algoritm have had to do. If this value is large you should consider increasing @code{sort_buffer}. -@item @code{Sort_range} @tab Number of sorts that where done with ranges. -@item @code{Sort_rows} @tab Number of sorted rows. -@item @code{Sort_scan} @tab Number of sorts that where done by scanning the table. -@item @code{ssl_xxx} @tab Variables used by SSL; Not yet implemented. -@item @code{Table_locks_immediate} @tab Number of times a table lock was -acquired immediately. Available after 3.23.33. -@item @code{Table_locks_waited} @tab Number of times a table lock could not -be acquired immediately and a wait was needed. If this is high, and you -have performance problems, you should first optimise your queries, and then -either split your table(s) or use replication. Available after 3.23.33. -@item @code{Threads_cached} @tab Number of threads in the thread cache. -@item @code{Threads_connected} @tab Number of currently open connections. -@item @code{Threads_created} @tab Number of threads created to handle connections. -@item @code{Threads_running} @tab Number of threads that are not sleeping. -@item @code{Uptime} @tab How many seconds the server has been up. -@end multitable - -Some comments about the above: - -@itemize @bullet -@item -If @code{Opened_tables} is big, then your @code{table_cache} -variable is probably too small. -@item -If @code{Key_reads} is big, then your @code{key_buffer_size} variable is -probably too small. The cache hit rate can be calculated with -@code{Key_reads}/@code{Key_read_requests}. -@item -If @code{Handler_read_rnd} is big, then you probably have a lot of -queries that require MySQL to scan whole tables or you have -joins that don't use keys properly. -@item -If @code{Threads_created} is big, you may want to increase the -@code{thread_cache_size} variable. The cache hit rate can be calculated -with @code{Threads_created}/@code{Connections}. -@item -If @code{Created_tmp_disk_tables} is big, you may want to increase the -@code{tmp_table_size} variable to get the temporary tables memory-based -instead of disk based. -@end itemize - - -@node SHOW VARIABLES, SHOW LOGS, SHOW STATUS, SHOW -@subsubsection @code{SHOW VARIABLES} - -@example -SHOW [GLOBAL | SESSION] VARIABLES [LIKE wild] -@end example - -@code{SHOW VARIABLES} shows the values of some MySQL system -variables. You can also get this information using the @code{mysqladmin -variables} command. If the default values are unsuitable, you can set most -of these variables using command-line options when @code{mysqld} starts up. -@xref{Command-line options}. - -The options @code{GLOBAL} and @code{SESSION} are new in MySQL 4.0.3. -With @code{GLOBAL} you will get the variables that will be used for new -connections to MySQL. With @code{SESSION} you will get the values that -are in effect for the current connection. If you are not using either -option, @code{SESSION} is used. - -You can change most options with the @code{SET} command. -@xref{SET OPTION, , @code{SET}}. - -The output resembles that shown here, though the format and numbers may -differ somewhat: - -@example -+---------------------------------+------------------------------+ -| Variable_name | Value | -+---------------------------------+------------------------------| -| back_log | 50 | -| basedir | /usr/local/mysql | -| bdb_cache_size | 8388572 | -| bdb_log_buffer_size | 32768 | -| bdb_home | /usr/local/mysql | -| bdb_max_lock | 10000 | -| bdb_logdir | | -| bdb_shared_data | OFF | -| bdb_tmpdir | /tmp/ | -| bdb_version | Sleepycat Software: ... | -| binlog_cache_size | 32768 | -| bulk_insert_buffer_size | 8388608 | -| character_set | latin1 | -| character_sets | latin1 big5 czech euc_kr | -| concurrent_insert | ON | -| connect_timeout | 5 | -| convert_character_set | | -| datadir | /usr/local/mysql/data/ | -| delay_key_write | ON | -| delayed_insert_limit | 100 | -| delayed_insert_timeout | 300 | -| delayed_queue_size | 1000 | -| flush | OFF | -| flush_time | 0 | -| ft_min_word_len | 4 | -| ft_max_word_len | 254 | -| ft_max_word_len_for_sort | 20 | -| ft_boolean_syntax | + -><()~*:""&| | -| have_bdb | YES | -| have_innodb | YES | -| have_isam | YES | -| have_raid | NO | -| have_symlink | DISABLED | -| have_openssl | YES | -| have_query_cache | YES | -| init_file | | -| innodb_additional_mem_pool_size | 1048576 | -| innodb_buffer_pool_size | 8388608 | -| innodb_data_file_path | ibdata1:10M:autoextend | -| innodb_data_home_dir | | -| innodb_file_io_threads | 4 | -| innodb_force_recovery | 0 | -| innodb_thread_concurrency | 8 | -| innodb_flush_log_at_trx_commit | 0 | -| innodb_fast_shutdown | ON | -| innodb_flush_method | | -| innodb_lock_wait_timeout | 50 | -| innodb_log_arch_dir | | -| innodb_log_archive | OFF | -| innodb_log_buffer_size | 1048576 | -| innodb_log_file_size | 5242880 | -| innodb_log_files_in_group | 2 | -| innodb_log_group_home_dir | ./ | -| innodb_mirrored_log_groups | 1 | -| interactive_timeout | 28800 | -| join_buffer_size | 131072 | -| key_buffer_size | 16773120 | -| language | /usr/local/mysql/share/... | -| large_files_support | ON | -| local_infile | ON | -| locked_in_memory | OFF | -| log | OFF | -| log_update | OFF | -| log_bin | OFF | -| log_slave_updates | OFF | -| log_slow_queries | OFF | -| log_warnings | OFF | -| long_query_time | 10 | -| low_priority_updates | OFF | -| lower_case_table_names | OFF | -| max_allowed_packet | 1047552 | -| max_binlog_cache_size | 4294967295 | -| max_binlog_size | 1073741824 | -| max_connections | 100 | -| max_connect_errors | 10 | -| max_delayed_threads | 20 | -| max_heap_table_size | 16777216 | -| max_join_size | 4294967295 | -| max_sort_length | 1024 | -| max_user_connections | 0 | -| max_tmp_tables | 32 | -| max_write_lock_count | 4294967295 | -| myisam_max_extra_sort_file_size | 268435456 | -| myisam_max_sort_file_size | 2147483647 | -| myisam_recover_options | force | -| myisam_sort_buffer_size | 8388608 | -| net_buffer_length | 16384 | -| net_read_timeout | 30 | -| net_retry_count | 10 | -| net_write_timeout | 60 | -| open_files_limit | 0 | -| pid_file | /usr/local/mysql/name.pid | -| port | 3306 | -| protocol_version | 10 | -| read_buffer_size | 131072 | -| read_rnd_buffer_size | 262144 | -| rpl_recovery_rank | 0 | -| query_cache_limit | 1048576 | -| query_cache_size | 0 | -| query_cache_type | ON | -| server_id | 0 | -| slave_net_timeout | 3600 | -| skip_external_locking | ON | -| skip_networking | OFF | -| skip_show_database | OFF | -| slow_launch_time | 2 | -| socket | /tmp/mysql.sock | -| sort_buffer_size | 2097116 | -| sql_mode | 0 | -| table_cache | 64 | -| table_type | MYISAM | -| thread_cache_size | 3 | -| thread_stack | 131072 | -| tx_isolation | READ-COMMITTED | -| timezone | EEST | -| tmp_table_size | 33554432 | -| tmpdir | /tmp/ | -| version | 4.0.4-beta | -| wait_timeout | 28800 | -+---------------------------------+------------------------------+ -@end example - -Each option is described here. Values for buffer sizes, lengths, and stack -sizes are given in bytes. You can specify values with a suffix of @samp{K} -or @samp{M} to indicate kilobytes or megabytes. For example, @code{16M} -indicates 16 megabytes. The case of suffix letters does not matter; -@code{16M} and @code{16m} are equivalent: - -@c FIX 2002-04-29 arjen / paul -@c FIX Below should be a @multitable just like SHOW STATUS. -@c FIX Has to wait till after O'Reilly printed edition is out the door. - -@cindex variables, values -@itemize -@item @code{ansi_mode}. -Is @code{ON} if @code{mysqld} was started with @code{--ansi}. -@xref{ANSI mode}. - -@item @code{back_log} -The number of outstanding connection requests MySQL can have. This -comes into play when the main MySQL thread gets @strong{very} -many connection requests in a very short time. It then takes some time -(although very little) for the main thread to check the connection and start -a new thread. The @code{back_log} value indicates how many requests can be -stacked during this short time before MySQL momentarily stops -answering new requests. You need to increase this only if you expect a large -number of connections in a short period of time. - -In other words, this value is the size of the listen queue for incoming -TCP/IP connections. Your operating system has its own limit on the size -of this queue. The manual page for the Unix @code{listen(2)} system -call should have more details. Check your OS documentation for the -maximum value for this variable. Attempting to set @code{back_log} -higher than your operating system limit will be ineffective. - -@item @code{basedir} -The value of the @code{--basedir} option. - -@item @code{bdb_cache_size} -The buffer that is allocated to cache index and rows for @code{BDB} -tables. If you don't use @code{BDB} tables, you should start -@code{mysqld} with @code{--skip-bdb} to not waste memory for this -cache. - -@item @code{bdb_log_buffer_size} -The buffer that is allocated to cache index and rows for @code{BDB} -tables. If you don't use @code{BDB} tables, you should set this to 0 or -start @code{mysqld} with @code{--skip-bdb} to not waste memory for this -cache. - -@item @code{bdb_home} -The value of the @code{--bdb-home} option. - -@item @code{bdb_max_lock} -The maximum number of locks (10,000 by default) you can have active on a -BDB table. You should increase this if you get errors of type @code{bdb: -Lock table is out of available locks} or @code{Got error 12 from ...} -when you have do long transactions or when @code{mysqld} has to examine -a lot of rows to calculate the query. - -@item @code{bdb_logdir} -The value of the @code{--bdb-logdir} option. - -@item @code{bdb_shared_data} -Is @code{ON} if you are using @code{--bdb-shared-data}. - -@item @code{bdb_tmpdir} -The value of the @code{--bdb-tmpdir} option. - -@item @code{binlog_cache_size}. The size of the cache to hold the SQL -statements for the binary log during a transaction. If you often use -big, multi-statement transactions you can increase this to get more -performance. @xref{COMMIT}. - -@item @code{bulk_insert_buffer_size} (was @code{myisam_bulk_insert_tree_size}) -MyISAM uses special tree-like cache to make bulk inserts (that is, -@code{INSERT ... SELECT}, @code{INSERT ... VALUES (...), (...), ...}, and -@code{LOAD DATA INFILE}) faster. This variable limits -the size of the cache tree in bytes per thread. Setting it to 0 -will disable this optimisation. -@strong{Note}: this cache is only used when adding data to non-empty table. -Default value is 8 MB. - -@item @code{character_set} -The default character set. - -@item @code{character_sets} -The supported character sets. - -@item @code{concurrent_inserts} -If @code{ON} (the default), MySQL will allow you to use @code{INSERT} on -@code{MyISAM} tables at the same time as you run @code{SELECT} queries -on them. You can turn this option off by starting @code{mysqld} with -@code{--safe} or @code{--skip-new}. - -@cindex timeout -@item @code{connect_timeout} -The number of seconds the @code{mysqld} server is waiting for a connect -packet before responding with @code{Bad handshake}. - -@item @code{datadir} -The value of the @code{--datadir} option. - -@item @code{delay_key_write} -Option for MyISAM tables. Can have one of the following values: - -@multitable @columnfractions .30 .70 -@item OFF @tab All CREATE TABLE ... DELAYED_KEY_WRITES are ignored. -@item ON @tab (default) MySQL will honor the @code{DELAY_KEY_WRITE} option -for @code{CREATE TABLE}. -@item ALL @tab All new opened tables are treated as if they were created with the @code{DELAY_KEY_WRITE} option. -@end multitable - -If @code{DELAY_KEY_WRITE} is enabled this means that the key buffer for -tables with this option will not get flushed on every index update, but -only when a table is closed. This will speed up writes on keys a lot, -but you should add automatic checking of all tables with @code{myisamchk ---fast --force} if you use this. - -@item @code{delayed_insert_limit} -After inserting @code{delayed_insert_limit} rows, the @code{INSERT -DELAYED} handler will check if there are any @code{SELECT} statements -pending. If so, it allows these to execute before continuing. - -@item @code{delayed_insert_timeout} -How long a @code{INSERT DELAYED} thread should wait for @code{INSERT} -statements before terminating. - -@item @code{delayed_queue_size} -What size queue (in rows) should be allocated for handling @code{INSERT -DELAYED}. If the queue becomes full, any client that does @code{INSERT -DELAYED} will wait until there is room in the queue again. - -@item @code{flush} -This is @code{ON} if you have started MySQL with the @code{--flush} -option. - -@item @code{flush_time} -If this is set to a non-zero value, then every @code{flush_time} seconds all -tables will be closed (to free up resources and sync things to disk). We -only recommend this option on Windows 9x/Me, or on systems where you have -very little resources. - -@item @code{ft_min_word_len} -The minimum length of the word to be included in a @code{FULLTEXT} index. -@strong{Note: @code{FULLTEXT} indexes must be rebuilt after changing -this variable.} (This option is new for MySQL 4.0.) - -@item @code{ft_max_word_len} -The maximum length of the word to be included in a @code{FULLTEXT} index. -@strong{Note: @code{FULLTEXT} indexes must be rebuilt after changing -this variable.} (This option is new for MySQL 4.0.) - -@item @code{ft_max_word_len_for_sort} -The maximum length of the word in a @code{FULLTEXT} index -to be used in fast index recreation method in @code{REPAIR}, -@code{CREATE INDEX}, or @code{ALTER TABLE}. Longer words are inserted the -slow way. The rule of the thumb is as follows: with -@code{ft_max_word_len_for_sort} increasing, @strong{MySQL} will create bigger -temporary files (thus slowing the process down, due to disk I/O), and will put -fewer keys in one sort block (again, decreasing the efficiency). When -@code{ft_max_word_len_for_sort} is too small, instead, @strong{MySQL} will insert a -lot of words into index the slow way, but short words will be inserted very -quickly. - -@item @code{ft_boolean_syntax} -List of operators supported by @code{MATCH ... AGAINST(... IN BOOLEAN MODE)}. -@xref{Fulltext Search}. - -@item @code{have_innodb} -@code{YES} if @code{mysqld} supports InnoDB tables. @code{DISABLED} -if @code{--skip-innodb} is used. -@item @code{have_bdb} -@code{YES} if @code{mysqld} supports Berkeley DB tables. @code{DISABLED} -if @code{--skip-bdb} is used. -@item @code{have_raid} -@code{YES} if @code{mysqld} supports the @code{RAID} option. -@item @code{have_openssl} -@code{YES} if @code{mysqld} supports SSL (encryption) on the client/server -protocol. - -@item @code{init_file} -The name of the file specified with the @code{--init-file} option when -you start the server. This is a file of SQL statements you want the -server to execute when it starts. - -@item @code{interactive_timeout} -The number of seconds the server waits for activity on an interactive -connection before closing it. An interactive client is defined as a -client that uses the @code{CLIENT_INTERACTIVE} option to -@code{mysql_real_connect()}. See also @code{wait_timeout}. - -@item @code{join_buffer_size} -The size of the buffer that is used for full joins (joins that do not -use indexes). The buffer is allocated one time for each full join -between two tables. Increase this value to get a faster full join when -adding indexes is not possible. (Normally the best way to get fast joins -is to add indexes.) - -@c Make texi2html support index @anchor{Index cache size}. Then change -@c some xrefs to point here -@cindex indexes, block size -@item @code{key_buffer_size} -Index blocks are buffered and are shared by all threads. -@code{key_buffer_size} is the size of the buffer used for index blocks. - -Increase this to get better index handling (for all reads and multiple -writes) to as much as you can afford; 64M on a 256M machine that mainly -runs MySQL is quite common. If you, however, make this too big -(for instance more than 50% of your total memory) your system may start -to page and become extremely slow. Remember that because MySQL does not -cache data reads, you will have to leave some room for the OS -filesystem cache. - -You can check the performance of the key buffer by doing @code{show -status} and examine the variables @code{Key_read_requests}, -@code{Key_reads}, @code{Key_write_requests}, and @code{Key_writes}. The -@code{Key_reads/Key_read_request} ratio should normally be < 0.01. -The @code{Key_write/Key_write_requests} is usually near 1 if you are -using mostly updates/deletes but may be much smaller if you tend to -do updates that affect many at the same time or if you are -using @code{DELAY_KEY_WRITE}. @xref{SHOW, , @code{SHOW}}. - -To get even more speed when writing many rows at the same time, use -@code{LOCK TABLES}. @xref{LOCK TABLES, , @code{LOCK TABLES}}. - -@item @code{language} -The language used for error messages. - -@item @code{large_file_support} -If @code{mysqld} was compiled with options for big file support. - -@item @code{locked_in_memory} -If @code{mysqld} was locked in memory with @code{--memlock} - -@item @code{log} -If logging of all queries is enabled. - -@item @code{log_update} -If the update log is enabled. - -@item @code{log_bin} -If the binary log is enabled. - -@item @code{log_slave_updates} -If the updates from the slave should be logged. - -@item @code{long_query_time} -If a query takes longer than this (in seconds), the @code{Slow_queries} counter -will be incremented. If you are using @code{--log-slow-queries}, the query -will be logged to the slow query logfile. This value is measured in real -time, not CPU time, so a query that may be under the threshold on a lightly -loaded system may be above the threshold on a heavily loaded one. -@xref{Slow query log}. - -@item @code{lower_case_table_names} -If set to 1 table names are stored in lowercase on disk and table -name comparisons will be case-insensitive. -From version 4.0.2, this option also applies to database names. -@xref{Name case sensitivity}. - -@item @code{max_allowed_packet} -The maximum size of one packet. The message buffer is initialised to -@code{net_buffer_length} bytes, but can grow up to @code{max_allowed_packet} -bytes when needed. This value by default is small, to catch big (possibly -wrong) packets. You must increase this value if you are using big -@code{BLOB} columns. It should be as big as the biggest @code{BLOB} you want -to use. The protocol limits for @code{max_allowed_packet} is 16M in MySQL -3.23 and 2G in MySQL 4.0. - -@item @code{max_binlog_cache_size} -If a multi-statement transaction requires more than this amount of memory, -one will get the error "Multi-statement transaction required more than -'max_binlog_cache_size' bytes of storage". - -@item @code{max_binlog_size} -Available after 3.23.33. If a write to the binary (replication) log exceeds -the given value, rotate the logs. You cannot set it to less than 1024 bytes, -or more than 1 GB. Default is 1 GB. - -@item @code{max_connections} -The number of simultaneous clients allowed. Increasing this value increases -the number of file descriptors that @code{mysqld} requires. See below for -comments on file descriptor limits. @xref{Too many connections}. - -@item @code{max_connect_errors} -If there is more than this number of interrupted connections from a host -this host will be blocked from further connections. You can unblock a host -with the command @code{FLUSH HOSTS}. - -@item @code{max_delayed_threads} -Don't start more than this number of threads to handle @code{INSERT DELAYED} -statements. If you try to insert data into a new table after all @code{INSERT -DELAYED} threads are in use, the row will be inserted as if the -@code{DELAYED} attribute wasn't specified. - -@item @code{max_heap_table_size} -Don't allow creation of heap tables bigger than this. - -@item @code{max_join_size} -Joins that are probably going to read more than @code{max_join_size} -records return an error. Set this value if your users tend to perform joins -that lack a @code{WHERE} clause, that take a long time, and that return -millions of rows. - -@item @code{max_sort_length} -The number of bytes to use when sorting @code{BLOB} or @code{TEXT} -values (only the first @code{max_sort_length} bytes of each value -are used; the rest are ignored). - -@item @code{max_user_connections} -The maximum number of active connections for a single user (0 = no limit). - -@item @code{max_tmp_tables} -(This option doesn't yet do anything.) -Maximum number of temporary tables a client can keep open at the same time. - -@item @code{max_write_lock_count} -After this many write locks, allow some read locks to run in between. - -@item @code{myisam_recover_options} -The value of the @code{--myisam-recover} option. - -@item @code{myisam_sort_buffer_size} -The buffer that is allocated when sorting the index when doing a -@code{REPAIR} or when creating indexes with @code{CREATE INDEX} or -@code{ALTER TABLE}. - -@item @code{myisam_max_extra_sort_file_size}. -If the temporary file used for fast index creation would be bigger than -using the key cache by the amount specified here, then prefer the key -cache method. This is mainly used to force long character keys in large -tables to use the slower key cache method to create the index. -@strong{Note} that this parameter is given in megabytes before 4.0.3 and -in bytes starting from this version. - -@item @code{myisam_max_sort_file_size} -The maximum size of the temporary file MySQL is allowed to use -while recreating the index (during @code{REPAIR}, @code{ALTER TABLE} -or @code{LOAD DATA INFILE}. If the file-size would be bigger than this, -the index will be created through the key cache (which is slower). -@strong{Note} that this parameter is given in megabytes before 4.0.3 and -in bytes starting from this version. - -@item @code{net_buffer_length} -The communication buffer is reset to this size between queries. This -should not normally be changed, but if you have very little memory, you -can set it to the expected size of a query. (That is, the expected length of -SQL statements sent by clients. If statements exceed this length, the buffer -is automatically enlarged, up to @code{max_allowed_packet} bytes.) - -@item @code{net_read_timeout} -Number of seconds to wait for more data from a connection before aborting -the read. Note that when we don't expect data from a connection, the timeout -is defined by @code{write_timeout}. See also @code{slave_net_timeout}. - -@item @code{net_retry_count} -If a read on a communication port is interrupted, retry this many times -before giving up. This value should be quite high on @code{FreeBSD} as -internal interrupts are sent to all threads. - -@item @code{net_write_timeout} -Number of seconds to wait for a block to be written to a connection before -aborting the write. - -@item @code{open_files_limit} -If this is not 0, then @code{mysqld} will use this value to reserve file -descriptors to use with @code{setrlimit()}. If this value is 0 then -@code{mysqld} will reserve @code{max_connections*5} or -@code{max_connections + table_cache*2} (whichever is larger) number of -files. You should try increasing this if @code{mysqld} gives you the -error 'Too many open files'. - -@item @code{pid_file} -The value of the @code{--pid-file} option. - -@item @code{port} -The value of the @code{--port} option. - -@item @code{protocol_version} -The protocol version used by the MySQL server. - -@item @code{read_buffer_size} (was @code{record_buffer}) -Each thread that does a sequential scan allocates a buffer of this -size for each table it scans. If you do many sequential scans, you may -want to increase this value. - -@item @code{record_rnd_buffer_size} -When reading rows in sorted order after a sort, the rows are read -through this buffer to avoid a disk seeks. Can improve @code{ORDER BY} -by a lot if set to a high value. As this is a thread-specific variable, -one should not set this big globally, but just change this when running -some specific big queries. - -@item @code{query_cache_limit} -Don't cache results that are bigger than this. (Default 1M). - -@item @code{query_cache_size} -The memory allocated to store results from old queries. -If this is 0, the query cache is disabled (default). - -@item @code{query_cache_type} -This may be set (only numeric) to -@multitable @columnfractions .09 .14 .72 -@item @strong{Value} @tab @strong{Alias} @tab @strong{Comment} -@item 0 @tab OFF @tab Don't cache or retrieve results. -@item 1 @tab ON @tab Cache all results except @code{SELECT SQL_NO_CACHE ...} queries. -@item 2 @tab DEMAND @tab Cache only @code{SELECT SQL_CACHE ...} queries. -@end multitable - -@item @code{safe_show_database} -Don't show databases for which the user doesn't have any database or -table privileges. This can improve security if you're concerned about -people being able to see what databases other users have. See also -@code{skip_show_database}. This option is deprecated as one should instead -use the @code{SHOW DATABASES} privilege instead. - -@item @code{server_id} -The value of the @code{--server-id} option. - -@item @code{skip_locking} -Is OFF if @code{mysqld} uses external locking. - -@item @code{skip_networking} -Is ON if we only allow local (socket) connections. - -@item @code{skip_show_database} -This prevents people from doing @code{SHOW DATABASES} if they don't have -the @code{SHOW DATABASE} privilege. This can improve security if you're -concerned about people being able to see what databases other users -have. See also @code{safe_show_database}. - -@item @code{slave_net_timeout} -Number of seconds to wait for more data from a master/slave connection -before aborting the read. - -@item @code{slow_launch_time} -If creating the thread takes longer than this value (in seconds), the -@code{Slow_launch_threads} counter will be incremented. - -@item @code{socket} -The Unix socket used by the server. - -@item @code{sort_buffer} -Each thread that needs to do a sort allocates a buffer of this -size. Increase this value for faster @code{ORDER BY} or @code{GROUP BY} -operations. -@xref{Temporary files}. - -@item @code{table_cache} -The number of open tables for all threads. Increasing this value -increases the number of file descriptors that @code{mysqld} requires. -You can check if you need to increase the table cache by checking the -@code{Opened_tables} variable. @xref{SHOW, , @code{SHOW}}. If this variable -is big and you don't do @code{FLUSH TABLES} a lot (which just forces all -tables to be closed and reopenend), then you should increase the value of this -variable. - -For more information about the table cache, see @ref{Table cache}. - -@item @code{table_type} -The default table type. - -@item @code{thread_cache_size} -How many threads we should keep in a cache for reuse. When a -client disconnects, the client's threads are put in the cache if there -aren't more than @code{thread_cache_size} threads from before. All new -threads are first taken from the cache, and only when the cache is empty -is a new thread created. This variable can be increased to improve -performance if you have a lot of new connections. (Normally this doesn't -give a notable performance improvement if you have a good -thread implementation.) By examing the difference between -the @code{Connections} and @code{Threads_created} status variables -(See @ref{SHOW STATUS} for details) you can see how efficient -thread cache is. - -@item @code{thread_concurrency} -On Solaris, @code{mysqld} will call @code{thr_setconcurrency()} with -this value. @code{thr_setconcurrency()} permits the application to give -the threads system a hint for the desired number of threads that should -be run at the same time. - -@item @code{thread_stack} -The stack size for each thread. Many of the limits detected by the -@code{crash-me} test are dependent on this value. The default is -large enough for normal operation. @xref{MySQL Benchmarks}. - -@item @code{timezone} -The timezone for the server. - -@item @code{tmp_table_size} -If an in-memory temporary table exceeds this size, MySQL -will automatically convert it to an on-disk @code{MyISAM} table. -Increase the value of @code{tmp_table_size} if you do many advanced -@code{GROUP BY} queries and you have lots of memory. - -@item @code{tmpdir} -The directory used for temporary files and temporary tables. - -@item @code{version} -The version number for the server. - -@item @code{wait_timeout} -The number of seconds the server waits for activity on a not interactive -connection before closing it. - -On thread startup @code{SESSION.WAIT_TIMEOUT} is initialised from -@code{GLOBAL.WAIT_TIMEOUT} or @code{GLOBAL.INTERACTIVE_TIMEOUT} depending -on the type of client (as defined by the @code{CLIENT_INTERACTIVE} connect -option). See also @code{interactive_timeout}. -@end itemize - -The manual section that describes tuning MySQL contains some -information of how to tune the above variables. @xref{Server parameters}. - - -@node SHOW LOGS, SHOW PROCESSLIST, SHOW VARIABLES, SHOW -@subsubsection @code{SHOW LOGS} - -@code{SHOW LOGS} shows you status information about existing log -files. It currently only displays information about Berkeley DB log -files. - -@itemize @bullet -@item @code{File} shows the full path to the log file -@item @code{Type} shows the type of the log file (@code{BDB} for Berkeley -DB log files) -@item @code{Status} shows the status of the log file (@code{FREE} if the -file can be removed, or @code{IN USE} if the file is needed by the transaction -subsystem) -@end itemize - - -@node SHOW PROCESSLIST, SHOW GRANTS, SHOW LOGS, SHOW -@subsubsection @code{SHOW PROCESSLIST} - -@findex threads -@findex PROCESSLIST - -@cindex threads, display -@cindex processes, display - -@code{SHOW [FULL] PROCESSLIST} shows you which threads are running. -You can also get this information using the @code{mysqladmin processlist} -command. If you have the @code{SUPER} privilege, you can see all -threads. Otherwise, you can see only your own threads. -@xref{KILL, ,@code{KILL}}. -If you don't use the @code{FULL} option, then only the first 100 -characters of each query will be shown. - -This command is very useful if you get the 'too many connections' error -message and want to find out what's going on. MySQL reserves -one extra connection for a client with the @code{SUPER} privilege -to ensure that you should always be able to login and check the system -(assuming you are not giving this privilege to all your users). - -Some states commonly seen in @code{mysqladmin processlist} - -@itemize @bullet -@item @code{Checking table} -The thread is performing [automatic] checking of the table. -@item @code{Closing tables} -Means that the thread is flushing the changed table data to disk and -closing the used tables. This should be a fast operation. If not, then -you should check that you don't have a full disk or that the disk is not -in very heavy use. -@item @code{Connect Out} -Slave connecting to master. -@item @code{Copying to tmp table on disk} -The temporary result set was larger than @code{tmp_table_size} and the -thread is now changing the in memory-based temporary table to a disk -based one to save memory. -@item @code{Creating tmp table} -The thread is creating a temporary table to hold a part of the result for -the query. -@item @code{deleting from main table} -When executing the first part of a multi-table delete and we are only -deleting from the first table. -@item @code{deleting from reference tables} -When executing the second part of a multi-table delete and we are deleting -the matched rows from the other tables. -@item @code{Flushing tables} -The thread is executing @code{FLUSH TABLES} and is waiting for all -threads to close their tables. -@item @code{Killed} -Someone has sent a kill to the thread and it should abort next time it -checks the kill flag. The flag is checked in each major loop in MySQL, -but in some cases it may still take a short time for the thread to die. -If the thread is locked by some other thread, the kill will take affect -as soon as the other thread releases it's lock. -@item @code{Sending data} -The thread is processing rows for a @code{SELECT} statement and is -also sending data to the client. -@item @code{Sorting for group} -The thread is doing a sort to satsify a @code{GROUP BY}. -@item @code{Sorting for order} -The thread is doing a sort to satsify a @code{ORDER BY}. -@item @code{Opening tables} -This simply means that the thread is trying to open a table. This is -should be very fast procedure, unless something prevents opening. For -example an @code{ALTER TABLE} or a @code{LOCK TABLE} can prevent opening -a table until the command is finished. -@item @code{Removing duplicates} -The query was using @code{SELECT DISTINCT} in such a way that MySQL -couldn't optimise that distinct away at an early stage. Because of this -MySQL has to do an extra stage to remove all duplicated rows before -sending the result to the client. -@item @code{Reopen table} -The thread got a lock for the table, but noticed after getting the lock -that the underlying table structure changed. It has freed the lock, -closed the table and is now trying to reopen it. -@item @code{Repair by sorting} -The repair code is using sorting to create indexes. -@item @code{Repair with keycache} -The repair code is using creating keys one by one through the key cache. -This is much slower than @code{Repair by sorting}. -@item @code{Searching rows for update} -The thread is doing a first phase to find all matching rows before -updating them. This has to be done if the @code{UPDATE} is changing -the index that is used to find the involved rows. -@item @code{Sleeping} -The thread is wating for the client to send a new command to it. -@item @code{System lock} -The thread is waiting for getting to get a external system lock for the -table. If you are not using multiple mysqld servers that are accessing -the same tables, you can disable system locks with the -@code{--skip-external-locking} option. -@item @code{Upgrading lock} -The @code{INSERT DELAYED} handler is trying to get a lock for the table -to insert rows. -@item @code{Updating} -The thread is searching for rows to update and updating them. -@item @code{User Lock} -The thread is waiting on a @code{GET_LOCK()}. -@item @code{Waiting for tables} -The thread got a notification that the underlying structure for a table -has changed and it needs to reopen the table to get the new structure. -To be able to reopen the table it must however wait until all other -threads have closed the table in question. - -This notification happens if another thread has used @code{FLUSH TABLES} -or one of the following commands on the table in question: @code{FLUSH -TABLES table_name}, @code{ALTER TABLE}, @code{RENAME TABLE}, -@code{REPAIR TABLE}, @code{ANALYZE TABLE} or @code{OPTIMIZE TABLE}. -@item @code{waiting for handler insert} -The @code{INSERT DELAYED} handler has processed all inserts and are -waiting to get new ones. -@end itemize - -Most states are very quick operations. If threads last in any of these -states for many seconds, there may be a problem around that needs to be -investigated. - -There are some other states that are not mentioned previously, but most of -these are only useful to find bugs in @code{mysqld}. - -@node SHOW GRANTS, SHOW CREATE TABLE, SHOW PROCESSLIST, SHOW -@subsubsection @code{SHOW GRANTS} - -@cindex privileges, display - -@code{SHOW GRANTS FOR user} lists the grant commands that must be issued to -duplicate the grants for a user. - -@example -mysql> SHOW GRANTS FOR root@@localhost; -+---------------------------------------------------------------------+ -| Grants for root@@localhost | -+---------------------------------------------------------------------+ -| GRANT ALL PRIVILEGES ON *.* TO 'root'@@'localhost' WITH GRANT OPTION | -+---------------------------------------------------------------------+ -@end example - - -@node SHOW CREATE TABLE, , SHOW GRANTS, SHOW -@subsubsection @code{SHOW CREATE TABLE} - -Shows a @code{CREATE TABLE} statement that will create the given table: - -@example -mysql> SHOW CREATE TABLE t\G -*************************** 1. row *************************** - Table: t -Create Table: CREATE TABLE t ( - id int(11) default NULL auto_increment, - s char(60) default NULL, - PRIMARY KEY (id) -) TYPE=MyISAM - -@end example - -@code{SHOW CREATE TABLE} will quote table and column names according to -@code{SQL_QUOTE_SHOW_CREATE} option. -@ref{SET OPTION, , @code{SET SQL_QUOTE_SHOW_CREATE}}. - - -@node Localisation, Server-Side Scripts, Database Administration, MySQL Database Administration -@section MySQL Localisation and International Usage - -@menu -* Character sets:: The Character Set Used for Data and Sorting -* Languages:: Non-English Error Messages -* Adding character set:: Adding a New Character Set -* Character arrays:: The Character Definition Arrays -* String collating:: String Collating Support -* Multi-byte characters:: Multi-byte Character Support -* Problems with character sets:: Problems With Character Sets -@end menu - - -@node Character sets, Languages, Localisation, Localisation -@subsection The Character Set Used for Data and Sorting - -@cindex character sets -@cindex data, character sets -@cindex sorting, character sets - -By default, MySQL uses the ISO-8859-1 (Latin1) character set -with sorting according to Swedish/Finnish. This is the character set suitable -in the USA and western Europe. - -All standard MySQL binaries are compiled with -@code{--with-extra-charsets=complex}. This will add code to all -standard programs to be able to handle @code{latin1} and all multi-byte -character sets within the binary. Other character sets will be -loaded from a character-set definition file when needed. - -The character set determines what characters are allowed in names and how -things are sorted by the @code{ORDER BY} and @code{GROUP BY} clauses of -the @code{SELECT} statement. - -You can change the character set with the @code{--default-character-set} -option when you start the server. The character sets available depend -on the @code{--with-charset=charset} and @code{--with-extra-charsets= -list-of-charset | complex | all} options to @code{configure}, and the -character set configuration files listed in -@file{SHAREDIR/charsets/Index}. @xref{configure options}. - -If you change the character set when running MySQL (which may -also change the sort order), you must run @code{myisamchk -r -q} on all -tables. Otherwise, your indexes may not be ordered correctly. - -When a client connects to a MySQL server, the server sends the -default character set in use to the client. The client will switch to -use this character set for this connection. - -One should use @code{mysql_real_escape_string()} when escaping strings -for a SQL query. @code{mysql_real_escape_string()} is identical to the -old @code{mysql_escape_string()} function, except that it takes the @code{MYSQL} -connection handle as the first parameter. - -If the client is compiled with different paths than where the server is -installed and the user who configured MySQL didn't include all -character sets in the MySQL binary, one must specify for -the client where it can find the additional character sets it will need -if the server runs with a different character set than the client. - -One can specify this by putting in a MySQL option file: - -@example -[client] -character-sets-dir=/usr/local/mysql/share/mysql/charsets -@end example - -where the path points to the directory in which the dynamic MySQL character -sets are stored. - -One can force the client to use specific character set by specifying: - -@example -[client] -default-character-set=character-set-name -@end example - -but normally this is never needed. - -@menu -* German character set:: German character set -@end menu - -@node German character set, , Character sets, Character sets -@subsubsection German character set - -To get German sorting order, you should start @code{mysqld} with -@code{--default-character-set=latin1_de}. This will give you the following -characteristics. - -When sorting and comparing string's the following mapping is done on the -strings before doing the comparison: - -@example -ä -> ae -ö -> oe -ü -> ue -ß -> ss -@end example - -All accented characters, are converted to their un-accented uppercase -counterpart. All letters are converted to uppercase. - -When comparing strings with @code{LIKE} the one -> two character mapping -is not done. All letters are converted to uppercase. Accent are removed -from all letters except: @code{Ü}, @code{ü}, @code{Ö}, @code{ö}, -@code{Ä} and @code{ä}. - - -@node Languages, Adding character set, Character sets, Localisation -@subsection Non-English Error Messages - -@cindex error messages, languages -@cindex messages, languages -@cindex files, error messages -@cindex language support - -@code{mysqld} can issue error messages in the following languages: -Czech, Danish, Dutch, English (the default), Estonian, French, German, Greek, -Hungarian, Italian, Japanese, Korean, Norwegian, Norwegian-ny, Polish, -Portuguese, Romanian, Russian, Slovak, Spanish, and Swedish. - -To start @code{mysqld} with a particular language, use either the -@code{--language=lang} or @code{-L lang} options. For example: - -@example -shell> mysqld --language=swedish -@end example - -or: - -@example -shell> mysqld --language=/usr/local/share/swedish -@end example - -Note that all language names are specified in lowercase. - -The language files are located (by default) in -@file{@var{mysql_base_dir}/share/@var{LANGUAGE}/}. - -To update the error message file, you should edit the @file{errmsg.txt} file -and execute the following command to generate the @file{errmsg.sys} file: - -@example -shell> comp_err errmsg.txt errmsg.sys -@end example - -If you upgrade to a newer version of MySQL, remember to repeat -your changes with the new @file{errmsg.txt} file. - - -@node Adding character set, Character arrays, Languages, Localisation -@subsection Adding a New Character Set - -@cindex character sets, adding -@cindex adding, character sets - -To add another character set to MySQL, use the following procedure. - -Decide if the set is simple or complex. If the character set -does not need to use special string collating routines for -sorting and does not need multi-byte character support, it is -simple. If it needs either of those features, it is complex. - -For example, @code{latin1} and @code{danish} are simple charactersets while -@code{big5} or @code{czech} are complex character sets. - -In the following section, we have assumed that you name your character -set @code{MYSET}. - -For a simple character set do the following: - -@enumerate -@item -Add MYSET to the end of the @file{sql/share/charsets/Index} file -Assign a unique number to it. - -@item -Create the file @file{sql/share/charsets/MYSET.conf}. -(You can use @file{sql/share/charsets/latin1.conf} as a base for this.) - -The syntax for the file very simple: - -@itemize @bullet -@item -Comments start with a '#' character and proceed to the end of the line. -@item -Words are separated by arbitrary amounts of whitespace. -@item -When defining the character set, every word must be a number in hexadecimal -format -@item -The @code{ctype} array takes up the first 257 words. The -@code{to_lower[]}, @code{to_upper[]} and @code{sort_order[]} arrays take up -256 words each after that. -@end itemize - -@xref{Character arrays}. - -@item -Add the character set name to the @code{CHARSETS_AVAILABLE} and -@code{COMPILED_CHARSETS} lists in @code{configure.in}. - -@item -Reconfigure, recompile, and test. - -@end enumerate - -For a complex character set do the following: - -@enumerate -@item -Create the file @file{strings/ctype-MYSET.c} in the MySQL source -distribution. - -@item -Add MYSET to the end of the @file{sql/share/charsets/Index} file. -Assign a unique number to it. - -@item -Look at one of the existing @file{ctype-*.c} files to see what needs to -be defined, for example @file{strings/ctype-big5.c}. Note that the -arrays in your file must have names like @code{ctype_MYSET}, -@code{to_lower_MYSET}, and so on. This corresponds to the arrays -in the simple character set. @xref{Character arrays}. For a complex -character set - -@item -Near the top of the file, place a special comment like this: - -@example -/* - * This comment is parsed by configure to create ctype.c, - * so don't change it unless you know what you are doing. - * - * .configure. number_MYSET=MYNUMBER - * .configure. strxfrm_multiply_MYSET=N - * .configure. mbmaxlen_MYSET=N - */ -@end example - -The @code{configure} program uses this comment to include -the character set into the MySQL library automatically. - -The strxfrm_multiply and mbmaxlen lines will be explained in -the following sections. Only include these if you need the string -collating functions or the multi-byte character set functions, -respectively. - -@item -You should then create some of the following functions: - -@itemize @bullet -@item @code{my_strncoll_MYSET()} -@item @code{my_strcoll_MYSET()} -@item @code{my_strxfrm_MYSET()} -@item @code{my_like_range_MYSET()} -@end itemize - -@xref{String collating}. - -@item -Add the character set name to the @code{CHARSETS_AVAILABLE} and -@code{COMPILED_CHARSETS} lists in @code{configure.in}. - -@item -Reconfigure, recompile, and test. -@end enumerate - -The file @file{sql/share/charsets/README} includes some more instructions. - -If you want to have the character set included in the MySQL -distribution, mail a patch to @email{internals@@lists.mysql.com}. - - -@node Character arrays, String collating, Adding character set, Localisation -@subsection The Character Definition Arrays - -@code{to_lower[]} and @code{to_upper[]} are simple arrays that hold the -lowercase and uppercase characters corresponding to each member of the -character set. For example: - -@example -to_lower['A'] should contain 'a' -to_upper['a'] should contain 'A' -@end example - -@code{sort_order[]} is a map indicating how characters should be ordered for -comparison and sorting purposes. For many character sets, this is the same as -@code{to_upper[]} (which means sorting will be case-insensitive). -MySQL will sort characters based on the value of -@code{sort_order[character]}. For more complicated sorting rules, see -the discussion of string collating below. @xref{String collating}. - -@code{ctype[]} is an array of bit values, with one element for one character. -(Note that @code{to_lower[]}, @code{to_upper[]}, and @code{sort_order[]} -are indexed by character value, but @code{ctype[]} is indexed by character -value + 1. This is an old legacy to be able to handle @code{EOF}.) - -You can find the following bitmask definitions in @file{m_ctype.h}: - -@example -#define _U 01 /* Uppercase */ -#define _L 02 /* Lowercase */ -#define _N 04 /* Numeral (digit) */ -#define _S 010 /* Spacing character */ -#define _P 020 /* Punctuation */ -#define _C 040 /* Control character */ -#define _B 0100 /* Blank */ -#define _X 0200 /* heXadecimal digit */ -@end example - -The @code{ctype[]} entry for each character should be the union of the -applicable bitmask values that describe the character. For example, -@code{'A'} is an uppercase character (@code{_U}) as well as a -hexadecimal digit (@code{_X}), so @code{ctype['A'+1]} should contain the -value: - -@example -_U + _X = 01 + 0200 = 0201 -@end example - - -@node String collating, Multi-byte characters, Character arrays, Localisation -@subsection String Collating Support - -@cindex collating, strings -@cindex string collating - -If the sorting rules for your language are too complex to be handled -with the simple @code{sort_order[]} table, you need to use the string -collating functions. - -Right now the best documentation on this is the character sets that are -already implemented. Look at the @code{big5}, @code{czech}, @code{gbk}, -@code{sjis}, and @code{tis160} character sets for examples. - -You must specify the @code{strxfrm_multiply_MYSET=N} value in the -special comment at the top of the file. @code{N} should be set to -the maximum ratio the strings may grow during @code{my_strxfrm_MYSET} (it -must be a positive integer). - - -@node Multi-byte characters, Problems with character sets, String collating, Localisation -@subsection Multi-byte Character Support - -@cindex characters, multi-byte -@cindex multi-byte characters - -If your want to add support for a new character set that includes -multi-byte characters, you need to use the multi-byte character -functions. - -Right now the best documentation on this is the character sets that are -already implemented. Look at the @code{euc_kr}, @code{gb2312}, -@code{gbk}, @code{sjis}, and @code{ujis} character sets for -examples. These are implemented in the @file{ctype-'charset'.c} files -in the @file{strings} directory. - -You must specify the @code{mbmaxlen_MYSET=N} value in the special -comment at the top of the source file. @code{N} should be set to the -size in bytes of the largest character in the set. - -@node Problems with character sets, , Multi-byte characters, Localisation -@subsection Problems With Character Sets - -If you try to use a character set that is not compiled into your binary, -you can run into a couple of different problems: - -@itemize @bullet -@item -Your program has a wrong path to where the character sets are stored. -(Default @file{/usr/local/mysql/share/mysql/charsets}). -This can be fixed by using the @code{--character-sets-dir} -option to the program in question. -@item -The character set is a multi-byte character set that can't be loaded -dynamically. In this case you have to recompile the program with the -support for the character set. -@item -The character set is a dynamic character set, but you don't have a -configure file for it. In this case you should install the configure -file for the character set from a new MySQL distribution. -@item -Your @file{Index} file doesn't contain the name for the character set. - -@example -ERROR 1105: File '/usr/local/share/mysql/charsets/?.conf' not found -(Errcode: 2) -@end example - -In this case you should either get a new @code{Index} file or add -by hand the name of any missing character sets. -@end itemize - -For @code{MyISAM} tables, you can check the character set name and number for a -table with @code{myisamchk -dvv table_name}. - - -@node Server-Side Scripts, Client-Side Scripts, Localisation, MySQL Database Administration -@section MySQL Server-Side Scripts and Utilities - -@menu -* Server-Side Overview:: Overview of the Server-Side Scripts and Utilities -* safe_mysqld:: @code{safe_mysqld}, The Wrapper Around @code{mysqld} -* mysqld_multi:: @code{mysqld_multi}, A Program for Managing Multiple MySQL Servers -* myisampack:: @code{myisampack}, The MySQL Compressed Read-only Table Generator -* mysqld-max:: @code{mysqld-max}, An Extended @code{mysqld} Server -@end menu - - -@node Server-Side Overview, safe_mysqld, Server-Side Scripts, Server-Side Scripts -@subsection Overview of the Server-Side Scripts and Utilities - -@cindex environment variables -@cindex programs, list of - -All MySQL programs take many different options. However, every -MySQL program provides a @code{--help} option that you can use -to get a full description of the program's different options. For example, try -@code{mysql --help}. - -You can override default options for all standard programs with an -option file. @ref{Option files}. - -The following list briefly describes the server-side MySQL programs: - -@table @code - -@cindex @code{myisamchk} -@item myisamchk -Utility to describe, check, optimise, and repair MySQL tables. -Because @code{myisamchk} has many functions, it is described in its own -chapter. @xref{MySQL Database Administration}. - -@cindex @code{make_binary_distribution} -@item make_binary_distribution -Makes a binary release of a compiled MySQL. This could be sent -by FTP to @file{/pub/mysql/Incoming} on @code{support.mysql.com} for the -convenience of other MySQL users. - -@cindex @code{mysqlbug} -@item mysqlbug -The MySQL bug report script. This script should always be used when -filing a bug report to the MySQL list. - -@cindex @code{mysqld} -@item mysqld -The SQL daemon. This should always be running. - -@cindex @code{mysql_install_db} -@item mysql_install_db -Creates the MySQL grant tables with default privileges. This is -usually executed only once, when first installing MySQL -on a system. - -@end table - - -@node safe_mysqld, mysqld_multi, Server-Side Overview, Server-Side Scripts -@subsection @code{safe_mysqld}, The Wrapper Around @code{mysqld} - -@cindex tools, safe_mysqld -@cindex scripts -@cindex @code{safe_mysqld} - -@code{safe_mysqld} is the recommended way to start a @code{mysqld} -daemon on Unix. @code{safe_mysqld} adds some safety features such as -restarting the server when an error occurs and logging run-time -information to a log file. - -If you don't use @code{--mysqld=#} or @code{--mysqld-version=#} -@code{safe_mysqld} will use an executable named @code{mysqld-max} if it -exists. If not, @code{safe_mysqld} will start @code{mysqld}. -This makes it very easy to test to use @code{mysqld-max} instead of -@code{mysqld}; just copy @code{mysqld-max} to where you have -@code{mysqld} and it will be used. - -Normally one should never edit the @code{safe_mysqld} script, but -instead put the options to @code{safe_mysqld} in the -@code{[safe_mysqld]} section in the @file{my.cnf} -file. @code{safe_mysqld} will read all options from the @code{[mysqld]}, -@code{[server]} and @code{[safe_mysqld]} sections from the option files. -@xref{Option files}. - -Note that all options on the command-line to @code{safe_mysqld} are passed -to @code{mysqld}. If you wants to use any options in @code{safe_mysqld} that -@code{mysqld} doesn't support, you must specify these in the option file. - -Most of the options to @code{safe_mysqld} are the same as the options to -@code{mysqld}. @xref{Command-line options}. - -@code{safe_mysqld} supports the following options: - -@table @code -@item --basedir=path -@item --core-file-size=# -Size of the core file @code{mysqld} should be able to create. Passed to @code{ulimit -c}. -@item --datadir=path -@item --defaults-extra-file=path -@item --defaults-file=path -@item --err-log=path -@item --ledir=path -Path to @code{mysqld} -@item --log=path -@item --mysqld=mysqld-version -Name of the @code{mysqld} version in the @code{ledir} directory you want to start. -@item --mysqld-version=version -Similar to @code{--mysqld=} but here you only give the suffix for @code{mysqld}. -For example if you use @code{--mysqld-version=max}, @code{safe_mysqld} will -start the @code{ledir/mysqld-max} version. If the argument to -@code{--mysqld-version} is empty, @code{ledir/mysqld} will be used. -@item --no-defaults -@item --open-files-limit=# -Number of files @code{mysqld} should be able to open. Passed to @code{ulimit -n}. Note that you need to start @code{safe_mysqld} as root for this to work properly! -@item --pid-file=path -@item --port=# -@item --socket=path -@item --timezone=# -Set the timezone (the @code{TZ}) variable to the value of this parameter. -@item --user=# -@end table - -The @code{safe_mysqld} script is written so that it normally is able to start -a server that was installed from either a source or a binary version of -MySQL, even if these install the server in slightly different -locations. @code{safe_mysqld} expects one of these conditions to be true: - -@itemize @bullet -@item -The server and databases can be found relative to the directory from which -@code{safe_mysqld} is invoked. @code{safe_mysqld} looks under its working -directory for @file{bin} and @file{data} directories (for binary -distributions) or for @file{libexec} and @file{var} directories (for source -distributions). This condition should be met if you execute -@code{safe_mysqld} from your MySQL installation directory (for -example, @file{/usr/local/mysql} for a binary distribution). - -@item -If the server and databases cannot be found relative to the working directory, -@code{safe_mysqld} attempts to locate them by absolute pathnames. Typical -locations are @file{/usr/local/libexec} and @file{/usr/local/var}. -The actual locations are determined when the distribution was built from which -@code{safe_mysqld} comes. They should be correct if -MySQL was installed in a standard location. -@end itemize - -Because @code{safe_mysqld} will try to find the server and databases relative -to its own working directory, you can install a binary distribution of -MySQL anywhere, as long as you start @code{safe_mysqld} from the -MySQL installation directory: - -@example -shell> cd mysql_installation_directory -shell> bin/safe_mysqld & -@end example - -If @code{safe_mysqld} fails, even when invoked from the MySQL -installation directory, you can modify it to use the path to @code{mysqld} -and the pathname options that are correct for your system. Note that if you -upgrade MySQL in the future, your modified version of -@code{safe_mysqld} will be overwritten, so you should make a copy of your -edited version that you can reinstall. - - -@node mysqld_multi, myisampack, safe_mysqld, Server-Side Scripts -@subsection @code{mysqld_multi}, A Program for Managing Multiple MySQL Servers - -@cindex tools, mysqld_multi -@cindex scripts -@cindex multi mysqld -@cindex @code{mysqld_multi} - -@code{mysqld_multi} is meant for managing several @code{mysqld} -processes that listen for connections on different Unix sockets and -TCP/IP ports. - -The program will search for group(s) named @code{[mysqld#]} from -@file{my.cnf} (or the file named by the @code{--config-file=...} option), -where @code{#} can be any positive number starting from 1. This number -is referred to in the following discussion as the option group number, -or GNR. Group numbers distinquish option groups from one another and are -used as arguments to @code{mysqld_multi} to specify which servers you want -to start, stop, or obtain status for. Options listed in these groups -should be the same as you would use in the the usual @code{[mysqld]} -group used for starting @code{mysqld}. (See, for example, @ref{Automatic -start}.) However, for @code{mysqld_multi}, be sure that each group -includes options for values such as the port, socket, etc., to be used -for each individual @code{mysqld} process. - -@code{mysqld_multi} is invoked using the following syntax: - -@example -Usage: mysqld_multi [OPTIONS] @{start|stop|report@} [GNR,GNR,GNR...] -or mysqld_multi [OPTIONS] @{start|stop|report@} [GNR-GNR,GNR,GNR-GNR,...] -@end example - -Each -GNR represents an option group number. You can start, stop or report -any GNR, or several of them at the same time. For an example of how you -might set up an option file, use this command: - -@example -shell> mysqld_multi --example -@end example - -The GNR values in the list can be comma-separated or combined with a dash; -in the latter case, all the GNRs between GNR1-GNR2 will be affected. With -no GNR argument, all groups listed in the option file will be either -started, stopped, or reported. Note that you must not have any white -spaces in the GNR list. Anything after a white space is ignored. - -@code{mysqld_multi} supports the following options: - -@table @code -@cindex config-file option -@item --config-file=... -Alternative config file. Note: This will not affect this program's own -options (group @code{[mysqld_multi]}), but only groups -@code{[mysqld#]}. Without this option, everything will be searched from the -ordinary @file{my.cnf} file. -@cindex example option -@item --example -Display an example option file. -@cindex help option -@item --help -Print this help and exit. -@cindex log option -@item --log=... -Log file. Full path to and the name for the log file. Note: If the file -exists, everything will be appended. -@cindex mysqladmin option -@item --mysqladmin=... -@code{mysqladmin} binary to be used for a server shutdown. -@cindex mysqld option -@item --mysqld=... -@code{mysqld} binary to be used. Note that you can give -@code{safe_mysqld} to this option also. The options are passed to -@code{mysqld}. Just make sure you have @code{mysqld} in your environment -variable @code{PATH} or fix @code{safe_mysqld}. -@cindex no-log option -@item --no-log -Print to stdout instead of the log file. By default the log file is -turned on. -@cindex password option -@item --password=... -Password for user for @code{mysqladmin}. -@cindex tcp-ip option -@item --tcp-ip -Connect to the MySQL server(s) via the TCP/IP port instead of -the Unix socket. This affects stopping and reporting. If a socket file -is missing, the server may still be running, but can be accessed only -via the TCP/IP port. By default, connections are made using the Unix socket. -@cindex user option -@item --user=... -MySQL user for @code{mysqladmin}. -@cindex version option -@item --version -Print the version number and exit. -@end table - -Some notes about @code{mysqld_multi}: - -@itemize @bullet -@item -Make sure that the MySQL user, who is stopping the -@code{mysqld} services (e.g using the @code{mysqladmin} program) have the same -password and username for all the data directories accessed (to the -@code{mysql} database) And make sure that the user has the @code{SHUTDOWN} -privilege! If you have many data directories and many different @code{mysql} -databases with different passwords for the MySQL @code{root} user, -you may want to create a common @code{multi_admin} user for each using the -same password (see below). Example how to do it: -@example -shell> mysql -u root -S /tmp/mysql.sock -proot_password -e -"GRANT SHUTDOWN ON *.* TO multi_admin@@localhost IDENTIFIED BY 'multipass'" -@end example -@xref{Privileges}. -You will have to do the above for each @code{mysqld} running in each -data directory, that you have (just change the socket, @code{-S=...}). -@item -@code{pid-file} is very important, if you are using @code{safe_mysqld} -to start @code{mysqld} (e.g., @code{--mysqld=safe_mysqld}) Every -@code{mysqld} should have its own @code{pid-file}. The advantage -using @code{safe_mysqld} instead of @code{mysqld} directly here is, -that @code{safe_mysqld} ``guards'' every @code{mysqld} process and will -restart it, if a @code{mysqld} process terminates due to a signal -sent using @code{kill -9}, or for other reasons such as a segmentation -fault (which MySQL should never do, of course ;). Please note that the -@code{safe_mysqld} script may require that you start it from a certain -place. This means that you may have to @code{cd} to a certain directory, -before you start the @code{mysqld_multi}. If you have problems starting, -please see the @code{safe_mysqld} script. Check especially the lines: - -@example --------------------------------------------------------------------------- -MY_PWD=`pwd` Check if we are starting this relative (for the binary -release) if test -d /data/mysql -a -f ./share/mysql/english/errmsg.sys --a -x ./bin/mysqld --------------------------------------------------------------------------- -@end example - -@xref{safe_mysqld, , @code{safe_mysqld}}. -The above test should be successful, or you may encounter problems. -@item -Beware of the dangers starting multiple @code{mysqld}s in the same data -directory. Use separate data directories, unless you @strong{know} what -you are doing! -@item -The socket file and the TCP/IP port must be different for every @code{mysqld}. -@item -The first and fifth @code{mysqld} group were intentionally left out from -the example. You may have 'gaps' in the config file. This gives you -more flexibility. The order in which the @code{mysqlds} are started or -stopped depends on the order in which they appear in the config file. -@item -When you want to refer to a certain group using GNR with this program, -just use the number in the end of the group name. -For example, the GNR for a group named @code{[mysqld17]} is 17. -@item -You may want to use option @code{--user} for @code{mysqld}, but in order to -do this you need to run the @code{mysqld_multi} script as the Unix @code{root} -user. Having the option in the config file doesn't matter; you will -just get a warning, if you are not the superuser and the @code{mysqlds} -are started under @strong{your} Unix account. @strong{Important}: Make -sure that the @code{pid-file} and the data directory are -read+write(+execute for the latter one) accessible for @strong{that} -Unix user, who the specific @code{mysqld} process is started -as. @strong{Do not} use the Unix root account for this, unless you -@strong{know} what you are doing! -@item -@strong{Most important}: Make sure that you understand the meanings of -the options that are passed to the @code{mysqld}s and @strong{why one -would want} to have separate @code{mysqld} processes. Starting multiple -@code{mysqld}s in one data directory @strong{will not} give you extra -performance in a threaded system! -@end itemize - -@xref{Multiple servers}. - -This is an example of the config file on behalf of @code{mysqld_multi}. - -@example -# This file should probably be in your home dir (~/.my.cnf) or /etc/my.cnf -# Version 2.1 by Jani Tolonen - -[mysqld_multi] -mysqld = /usr/local/bin/safe_mysqld -mysqladmin = /usr/local/bin/mysqladmin -user = multi_admin -password = multipass - -[mysqld2] -socket = /tmp/mysql.sock2 -port = 3307 -pid-file = /usr/local/mysql/var2/hostname.pid2 -datadir = /usr/local/mysql/var2 -language = /usr/local/share/mysql/english -user = john - -[mysqld3] -socket = /tmp/mysql.sock3 -port = 3308 -pid-file = /usr/local/mysql/var3/hostname.pid3 -datadir = /usr/local/mysql/var3 -language = /usr/local/share/mysql/swedish -user = monty - -[mysqld4] -socket = /tmp/mysql.sock4 -port = 3309 -pid-file = /usr/local/mysql/var4/hostname.pid4 -datadir = /usr/local/mysql/var4 -language = /usr/local/share/mysql/estonia -user = tonu - -[mysqld6] -socket = /tmp/mysql.sock6 -port = 3311 -pid-file = /usr/local/mysql/var6/hostname.pid6 -datadir = /usr/local/mysql/var6 -language = /usr/local/share/mysql/japanese -user = jani -@end example - -@xref{Option files}. - - -@node myisampack, mysqld-max, mysqld_multi, Server-Side Scripts -@subsection @code{myisampack}, The MySQL Compressed Read-only Table Generator - -@cindex compressed tables -@cindex tables, compressed -@cindex MyISAM, compressed tables -@cindex @code{myisampack} -@cindex @code{pack_isam} - -@code{myisampack} is used to compress MyISAM tables, and @code{pack_isam} -is used to compress ISAM tables. Because ISAM tables are deprecated, we -will only discuss @code{myisampack} here, but everything said about -@code{myisampack} should also be true for @code{pack_isam}. - -@code{myisampack} works by compressing each column in the table separately. -The information needed to decompress columns is read into memory when the -table is opened. This results in much better performance when accessing -individual records, because you only have to uncompress exactly one record, not -a much larger disk block as when using Stacker on MS-DOS. -Usually, @code{myisampack} packs the datafile 40%-70%. - -MySQL uses memory mapping (@code{mmap()}) on compressed tables and -falls back to normal read/write file usage if @code{mmap()} doesn't work. - -Please note the following: -@itemize @bullet -@item -After packing, the table is read-only. This is generally intended -(such as when accessing packed tables on a CD). Also allowing writes -to a packed table is on our TODO list but with low priority. -@item -@code{myisampack} can also pack @code{BLOB} or @code{TEXT} columns. -The older @code{pack_isam} (for @code{ISAM} tables) can not do this. -@end itemize - -@code{myisampack} is invoked like this: - -@example -shell> myisampack [options] filename ... -@end example - -Each filename should be the name of an index (@file{.MYI}) file. If you -are not in the database directory, you should specify the pathname to the -file. It is permissible to omit the @file{.MYI} extension. - -@code{myisampack} supports the following options: - -@table @code -@item -b, --backup -Make a backup of the table as @code{tbl_name.OLD}. - -@item -#, --debug=debug_options -Output debug log. The @code{debug_options} string often is -@code{'d:t:o,filename'}. - -@item -f, --force -Force packing of the table even if it becomes bigger or if the temporary file -exists. @code{myisampack} creates a temporary file named @file{tbl_name.TMD} -while it compresses the table. If you kill @code{myisampack}, the @file{.TMD} -file may not be deleted. Normally, @code{myisampack} exits with an error if -it finds that @file{tbl_name.TMD} exists. With @code{--force}, -@code{myisampack} packs the table anyway. - -@item -?, --help -Display a help message and exit. - -@item -j big_tbl_name, --join=big_tbl_name -Join all tables named on the command-line into a single table -@code{big_tbl_name}. All tables that are to be combined -@strong{must} be identical (same column names and types, same indexes, etc.). - -@item -p #, --packlength=# -Specify the record length storage size, in bytes. The value should be 1, 2, -or 3. (@code{myisampack} stores all rows with length pointers of 1, 2, or 3 -bytes. In most normal cases, @code{myisampack} can determine the right length -value before it begins packing the file, but it may notice during the packing -process that it could have used a shorter length. In this case, -@code{myisampack} will print a note that the next time you pack the same file, -you could use a shorter record length.) - -@item -s, --silent -Silent mode. Write output only when errors occur. - -@item -t, --test -Don't actually pack table, just test packing it. - -@item -T dir_name, --tmp_dir=dir_name -Use the named directory as the location in which to write the temporary table. - -@item -v, --verbose -Verbose mode. Write information about progress and packing result. - -@item -V, --version -Display version information and exit. - -@item -w, --wait - -Wait and retry if table is in use. If the @code{mysqld} server was -invoked with the @code{--skip-external-locking} option, it is not a good idea -to invoke @code{myisampack} if the table might be updated during the -packing process. -@end table - -@cindex examples, compressed tables -The sequence of commands shown here illustrates a typical table compression -session: - -@example -shell> ls -l station.* --rw-rw-r-- 1 monty my 994128 Apr 17 19:00 station.MYD --rw-rw-r-- 1 monty my 53248 Apr 17 19:00 station.MYI --rw-rw-r-- 1 monty my 5767 Apr 17 19:00 station.frm - -shell> myisamchk -dvv station - -MyISAM file: station -Isam-version: 2 -Creation time: 1996-03-13 10:08:58 -Recover time: 1997-02-02 3:06:43 -Data records: 1192 Deleted blocks: 0 -Datafile: Parts: 1192 Deleted data: 0 -Datafile pointer (bytes): 2 Keyfile pointer (bytes): 2 -Max datafile length: 54657023 Max keyfile length: 33554431 -Recordlength: 834 -Record format: Fixed length - -table description: -Key Start Len Index Type Root Blocksize Rec/key -1 2 4 unique unsigned long 1024 1024 1 -2 32 30 multip. text 10240 1024 1 - -Field Start Length Type -1 1 1 -2 2 4 -3 6 4 -4 10 1 -5 11 20 -6 31 1 -7 32 30 -8 62 35 -9 97 35 -10 132 35 -11 167 4 -12 171 16 -13 187 35 -14 222 4 -15 226 16 -16 242 20 -17 262 20 -18 282 20 -19 302 30 -20 332 4 -21 336 4 -22 340 1 -23 341 8 -24 349 8 -25 357 8 -26 365 2 -27 367 2 -28 369 4 -29 373 4 -30 377 1 -31 378 2 -32 380 8 -33 388 4 -34 392 4 -35 396 4 -36 400 4 -37 404 1 -38 405 4 -39 409 4 -40 413 4 -41 417 4 -42 421 4 -43 425 4 -44 429 20 -45 449 30 -46 479 1 -47 480 1 -48 481 79 -49 560 79 -50 639 79 -51 718 79 -52 797 8 -53 805 1 -54 806 1 -55 807 20 -56 827 4 -57 831 4 - -shell> myisampack station.MYI -Compressing station.MYI: (1192 records) -- Calculating statistics - -normal: 20 empty-space: 16 empty-zero: 12 empty-fill: 11 -pre-space: 0 end-space: 12 table-lookups: 5 zero: 7 -Original trees: 57 After join: 17 -- Compressing file -87.14% - -shell> ls -l station.* --rw-rw-r-- 1 monty my 127874 Apr 17 19:00 station.MYD --rw-rw-r-- 1 monty my 55296 Apr 17 19:04 station.MYI --rw-rw-r-- 1 monty my 5767 Apr 17 19:00 station.frm - -shell> myisamchk -dvv station - -MyISAM file: station -Isam-version: 2 -Creation time: 1996-03-13 10:08:58 -Recover time: 1997-04-17 19:04:26 -Data records: 1192 Deleted blocks: 0 -Datafile: Parts: 1192 Deleted data: 0 -Datafilepointer (bytes): 3 Keyfile pointer (bytes): 1 -Max datafile length: 16777215 Max keyfile length: 131071 -Recordlength: 834 -Record format: Compressed - -table description: -Key Start Len Index Type Root Blocksize Rec/key -1 2 4 unique unsigned long 10240 1024 1 -2 32 30 multip. text 54272 1024 1 - -Field Start Length Type Huff tree Bits -1 1 1 constant 1 0 -2 2 4 zerofill(1) 2 9 -3 6 4 no zeros, zerofill(1) 2 9 -4 10 1 3 9 -5 11 20 table-lookup 4 0 -6 31 1 3 9 -7 32 30 no endspace, not_always 5 9 -8 62 35 no endspace, not_always, no empty 6 9 -9 97 35 no empty 7 9 -10 132 35 no endspace, not_always, no empty 6 9 -11 167 4 zerofill(1) 2 9 -12 171 16 no endspace, not_always, no empty 5 9 -13 187 35 no endspace, not_always, no empty 6 9 -14 222 4 zerofill(1) 2 9 -15 226 16 no endspace, not_always, no empty 5 9 -16 242 20 no endspace, not_always 8 9 -17 262 20 no endspace, no empty 8 9 -18 282 20 no endspace, no empty 5 9 -19 302 30 no endspace, no empty 6 9 -20 332 4 always zero 2 9 -21 336 4 always zero 2 9 -22 340 1 3 9 -23 341 8 table-lookup 9 0 -24 349 8 table-lookup 10 0 -25 357 8 always zero 2 9 -26 365 2 2 9 -27 367 2 no zeros, zerofill(1) 2 9 -28 369 4 no zeros, zerofill(1) 2 9 -29 373 4 table-lookup 11 0 -30 377 1 3 9 -31 378 2 no zeros, zerofill(1) 2 9 -32 380 8 no zeros 2 9 -33 388 4 always zero 2 9 -34 392 4 table-lookup 12 0 -35 396 4 no zeros, zerofill(1) 13 9 -36 400 4 no zeros, zerofill(1) 2 9 -37 404 1 2 9 -38 405 4 no zeros 2 9 -39 409 4 always zero 2 9 -40 413 4 no zeros 2 9 -41 417 4 always zero 2 9 -42 421 4 no zeros 2 9 -43 425 4 always zero 2 9 -44 429 20 no empty 3 9 -45 449 30 no empty 3 9 -46 479 1 14 4 -47 480 1 14 4 -48 481 79 no endspace, no empty 15 9 -49 560 79 no empty 2 9 -50 639 79 no empty 2 9 -51 718 79 no endspace 16 9 -52 797 8 no empty 2 9 -53 805 1 17 1 -54 806 1 3 9 -55 807 20 no empty 3 9 -56 827 4 no zeros, zerofill(2) 2 9 -57 831 4 no zeros, zerofill(1) 2 9 -@end example - -The information printed by @code{myisampack} is described here: - -@table @code -@item normal -The number of columns for which no extra packing is used. - -@item empty-space -The number of columns containing -values that are only spaces; these will occupy 1 bit. - -@item empty-zero -The number of columns containing -values that are only binary 0's; these will occupy 1 bit. - -@item empty-fill -The number of integer columns that don't occupy the full byte range of their -type; these are changed to a smaller type (for example, an @code{INTEGER} -column may be changed to @code{MEDIUMINT}). - -@item pre-space -The number of decimal columns that are stored with leading spaces. In this -case, each value will contain a count for the number of leading spaces. - -@item end-space -The number of columns that have a lot of trailing spaces. In this case, each -value will contain a count for the number of trailing spaces. - -@item table-lookup -The column had only a small number of different values, which were -converted to an @code{ENUM} before Huffman compression. - -@item zero -The number of columns for which all values are zero. - -@item Original trees -The initial number of Huffman trees. - -@item After join -The number of distinct Huffman trees left after joining -trees to save some header space. -@end table - -After a table has been compressed, @code{myisamchk -dvv} prints additional -information about each field: - -@table @code -@item Type -The field type may contain the following descriptors: - -@table @code -@item constant -All rows have the same value. - -@item no endspace -Don't store endspace. - -@item no endspace, not_always -Don't store endspace and don't do end space compression for all values. - -@item no endspace, no empty -Don't store endspace. Don't store empty values. - -@item table-lookup -The column was converted to an @code{ENUM}. - -@item zerofill(n) -The most significant @code{n} bytes in the value are always 0 and are not -stored. - -@item no zeros -Don't store zeros. - -@item always zero -0 values are stored in 1 bit. -@end table - -@item Huff tree -The Huffman tree associated with the field. - -@item Bits -The number of bits used in the Huffman tree. -@end table - -After you have run @code{pack_isam}/@code{myisampack} you must run -@code{isamchk}/@code{myisamchk} to re-create the index. At this time you -can also sort the index blocks and create statistics needed for -the MySQL optimiser to work more efficiently: - -@example -myisamchk -rq --analyze --sort-index table_name.MYI -isamchk -rq --analyze --sort-index table_name.ISM -@end example - -After you have installed the packed table into the MySQL database -directory you should do @code{mysqladmin flush-tables} to force @code{mysqld} -to start using the new table. - -If you want to unpack a packed table, you can do this with the -@code{--unpack} option to @code{isamchk} or @code{myisamchk}. - - -@node mysqld-max, , myisampack, Server-Side Scripts -@subsection @code{mysqld-max}, An Extended @code{mysqld} Server - -@cindex @code{mysqld-max} - -@code{mysqld-max} is the MySQL server (@code{mysqld}) configured with -the following configure options: - -@multitable @columnfractions .30 .45 -@item @strong{Option} @tab @strong{Comment} -@item --with-server-suffix=-max @tab Add a suffix to the @code{mysqld} version string. -@item --with-innodb @tab Support for InnoDB tables. -@item --with-bdb @tab Support for Berkeley DB (BDB) tables -@item CFLAGS=-DUSE_SYMDIR @tab Symbolic links support for Windows. -@end multitable - -You can find the MySQL-max binaries at -@uref{http://www.mysql.com/downloads/mysql-max-3.23.html}. - -The Windows MySQL binary distributions includes both the -standard @code{mysqld.exe} binary and the @code{mysqld-max.exe} binary. -@uref{http://www.mysql.com/downloads/mysql-3.23.html}. -@xref{Windows installation}. - -Note that as InnoDB and Berkeley DB are not available for all platforms, -some of the @code{Max} binaries may not have support for both of these. -You can check which table types are supported by doing the following -query: - -@example -mysql> SHOW VARIABLES LIKE "have_%"; -+---------------+-------+ -| Variable_name | Value | -+---------------+-------+ -| have_bdb | YES | -| have_innodb | NO | -| have_isam | YES | -| have_raid | NO | -| have_openssl | NO | -+---------------+-------+ -@end example - -The meaning of the values are: - -@multitable @columnfractions .15 .85 -@item @strong{Value} @tab @strong{Meaning} -@item @code{YES} @tab The option is activated and usable. -@item @code{NO} @tab MySQL is not compiled with support for this option. -@item @code{DISABLED} @tab The xxxx option is disabled because one started @code{mysqld} with @code{--skip-xxxx} or because one didn't start @code{mysqld} with all needed options to enable the option. In this case the @code{hostname.err} file should contain a reason for why the option is disabled. -@end multitable - -@strong{Note}: To be able to create InnoDB tables you @strong{must} edit -your startup options to include at least the @code{innodb_data_file_path} -option. @xref{InnoDB start}. - -To get better performance for BDB tables, you should add some configuration -options for these too. @xref{BDB start}. - -@code{safe_mysqld} will automatically try to start any @code{mysqld} binary -with the @code{-max} suffix. This makes it very easy to test out a -another @code{mysqld} binary in an existing installation. Just -run @code{configure} with the options you want and then install the -new @code{mysqld} binary as @code{mysqld-max} in the same directory -where your old @code{mysqld} binary is. @xref{safe_mysqld, , @code{safe_mysqld}}. - -The @code{mysqld-max} RPM uses the above mentioned @code{safe_mysqld} -feature. It just installs the @code{mysqld-max} executable and -@code{safe_mysqld} will automatically use this executable when -@code{safe_mysqld} is restarted. - -The following table shows which table types our standard MySQL-Max -binaries includes: - -@multitable @columnfractions .15 .10 .10 -@item @strong{System} @tab @code{BDB} @tab @code{InnoDB} -@item AIX 4.3 @tab N @tab Y -@item HP-UX 11.0 @tab N @tab Y -@item Linux-Alpha @tab N @tab Y -@item Linux-Intel @tab Y @tab Y -@item Linux-IA64 @tab N @tab Y -@item Solaris-Intel @tab N @tab Y -@item Solaris-SPARC @tab Y @tab Y -@item Caldera (SCO) OSR5 @tab Y @tab Y -@item UnixWare @tab Y @tab Y -@item Windows/NT @tab Y @tab Y -@end multitable - - -@node Client-Side Scripts, Log Files, Server-Side Scripts, MySQL Database Administration -@section MySQL Client-Side Scripts and Utilities - -@menu -* Client-Side Overview:: Overview of the Client-Side Scripts and Utilities -* mysql:: The Command-line Tool -* mysqladmin:: @code{mysqladmin}, Administrating a MySQL Server -* Using mysqlcheck:: Using @code{mysqlcheck} for Table Maintenance and Crash Recovery -* mysqldump:: @code{mysqldump}, Dumping Table Structure and Data -* mysqlhotcopy:: @code{mysqlhotcopy}, Copying MySQL Databases and Tables -* mysqlimport:: @code{mysqlimport}, Importing Data from Text Files -* mysqlshow:: Showing Databases, Tables, and Columns -* perror:: @code{perror}, Explaining Error Codes -* Batch Commands:: How to Run SQL Commands from a Text File -@end menu - - -@node Client-Side Overview, mysql, Client-Side Scripts, Client-Side Scripts -@subsection Overview of the Client-Side Scripts and Utilities - -@cindex environment variables -@cindex programs, list of - -All MySQL clients that communicate with the server using the -@code{mysqlclient} library use the following environment variables: - -@tindex @code{MYSQL_UNIX_PORT} environment variable -@tindex environment variable, @code{MYSQL_UNIX_PORT} -@tindex @code{MYSQL_TCP_PORT} environment variable -@tindex environment variable, @code{MYSQL_TCP_PORT} -@tindex @code{MYSQL_PWD} environment variable -@tindex environment variable, @code{MYSQL_PWD} -@tindex @code{MYSQL_DEBUG} environment variable -@tindex environment variable, @code{MYSQL_DEBUG} -@multitable @columnfractions .25 .60 -@item @strong{Name} @tab @strong{Description} -@item @code{MYSQL_UNIX_PORT} @tab The default socket; used for connections to @code{localhost} -@item @code{MYSQL_TCP_PORT} @tab The default TCP/IP port -@item @code{MYSQL_PWD} @tab The default password -@item @code{MYSQL_DEBUG} @tab Debug-trace options when debugging -@item @code{TMPDIR} @tab The directory where temporary tables/files are created -@end multitable - -Use of @code{MYSQL_PWD} is insecure. -@xref{Connecting}. - -@tindex @code{MYSQL_HISTFILE} environment variable -@tindex environment variable, @code{MYSQL_HISTFILE} -@tindex @code{HOME} environment variable -@tindex environment variable, @code{HOME} -@cindex history file -@cindex command-line history -@tindex .mysql_history file -The @file{mysql} client uses the file named in the @code{MYSQL_HISTFILE} -environment variable to save the command-line history. The default value for -the history file is @file{$HOME/.mysql_history}, where @code{$HOME} is the -value of the @code{HOME} environment variable. @xref{Environment variables}. - -All MySQL programs take many different options. However, every -MySQL program provides a @code{--help} option that you can use -to get a full description of the program's different options. For example, try -@code{mysql --help}. - -You can override default options for all standard client programs with an -option file. @ref{Option files}. - -The following list briefly describes the client-side MySQL programs: - -@table @code - -@cindex @code{msql2mysql} -@item msql2mysql -A shell script that converts @code{mSQL} programs to MySQL. It doesn't -handle all cases, but it gives a good start when converting. - -@cindex @code{mysqlaccess} -@item mysqlaccess -A script that checks the access privileges for a host, user, and database -combination. - -@cindex @code{mysqladmin} -@item mysqladmin -Utility for performing administrative operations, such as creating or -dropping databases, reloading the grant tables, flushing tables to disk, and -reopening log files. @code{mysqladmin} can also be used to retrieve version, -process, and status information from the server. -@xref{mysqladmin, , @code{mysqladmin}}. - -@cindex @code{mysqldump} -@item mysqldump -Dumps a MySQL database into a file as SQL statements or -as tab-separated text files. Enhanced freeware originally by Igor Romanenko. -@xref{mysqldump, , @code{mysqldump}}. - -@cindex @code{mysqlimport} -@item mysqlimport -Imports text files into their respective tables using @code{LOAD DATA -INFILE}. @xref{mysqlimport, , @code{mysqlimport}}. - -@cindex @code{mysqlshow} -@item mysqlshow -Displays information about databases, tables, columns, and indexes. - -@cindex @code{replace} -@item replace -A utility program that is used by @code{msql2mysql}, but that has more -general applicability as well. @code{replace} changes strings in place in -files or on the standard input. Uses a finite state machine to match longer -strings first. Can be used to swap strings. For example, this command -swaps @code{a} and @code{b} in the given files: - -@example -shell> replace a b b a -- file1 file2 ... -@end example -@end table - - -@node mysql, mysqladmin, Client-Side Overview, Client-Side Scripts -@subsection @code{mysql}, The Command-line Tool - -@cindex command-line tool -@cindex tools, command-line -@cindex scripts -@cindex @code{mysql} - -@code{mysql} is a simple SQL shell (with GNU @code{readline} capabilities). -It supports interactive and non-interactive use. When used interactively, -query results are presented in an ASCII-table format. When used -non-interactively (for example, as a filter), the result is presented in -tab-separated format. (The output format can be changed using command-line -options.) You can run scripts simply like this: - -@example -shell> mysql database < script.sql > output.tab -@end example - -If you have problems due to insufficient memory in the client, use the -@code{--quick} option! This forces @code{mysql} to use -@code{mysql_use_result()} rather than @code{mysql_store_result()} to -retrieve the result set. - -Using @code{mysql} is very easy. Just start it as follows: -@code{mysql database} or @code{mysql --user=user_name --password=your_password database}. Type a SQL statement, end it with @samp{;}, @samp{\g}, or @samp{\G} -and press Enter. - -@cindex @code{mysql} command-line options -@cindex command-line options, @code{mysql} -@cindex options, command-line, @code{mysql} -@cindex startup parameters, @code{mysql} -@code{mysql} supports the following options: - -@table @code -@cindex @code{help}, @code{mysql} option -@item -?, --help -Display this help and exit. - -@cindex @code{no-auto-rehash}, @code{mysql} option -@item -A, --no-auto-rehash -No automatic rehashing. One has to use 'rehash' to get table and field -completion. This gives a quicker start of mysql. - -@cindex @code{prompt}, @code{mysql} option -@item --prompt=... -Set the mysql prompt to specified format. - -@cindex @code{no-beep}, @code{mysql} option -@item -b, --no-beep -Turn off beep-on-error. - -@cindex @code{batch}, @code{mysql} option -@item -B, --batch -Print results with a tab as separator, each row on a new line. Doesn't use -history file. - -@cindex @code{character-sets-dir}, @code{mysql} option -@item --character-sets-dir=... -Directory where character sets are located. - -@cindex @code{compress}, @code{mysql} option -@item -C, --compress -Use compression in server/client protocol. - -@cindex @code{debug}, @code{mysql} option -@item -#, --debug[=...] -Debug log. Default is 'd:t:o,/tmp/mysql.trace'. - -@cindex @code{database}, @code{mysql} option -@item -D, --database=... -Database to use. This is mainly useful in the @file{my.cnf} file. - -@cindex @code{default-character-set}, @code{mysql} option -@item --default-character-set=... -Set the default character set. - -@cindex @code{execute}, @code{mysql} option -@item -e, --execute=... -Execute command and quit. (Output like with --batch) - -@cindex @code{vertical}, @code{mysql} option -@item -E, --vertical -Print the output of a query (rows) vertically. Without this option you -can also force this output by ending your statements with @code{\G}. - -@cindex @code{force}, @code{mysql} option -@item -f, --force -Continue even if we get a SQL error. - -@cindex @code{no-named-commands}, @code{mysql} option -@item -g, --no-named-commands -Named commands are disabled. Use \* form only, or use named commands -only in the beginning of a line ending with a semicolon (@samp{;}). Since -Version 10.9, the client now starts with this option @strong{enabled} by default! -With the -g option, long format commands will still work from the first -line, however. - -@cindex @code{enable-named-commands}, @code{mysql} option -@item -G, --enable-named-commands -Named commands are @strong{enabled}. Long format commands are allowed as -well as shortened \* commands. - -@cindex @code{ignore-space}, @code{mysql} option -@item -i, --ignore-space -Ignore space after function names. - -@cindex @code{host}, @code{mysql} option -@item -h, --host=... -Connect to the given host. - -@cindex @code{html}, @code{mysql} option -@item -H, --html -Produce HTML output. - -@cindex @code{skip-line-numbers}, @code{mysql} option -@item -L, --skip-line-numbers -Don't write line number for errors. Useful when one wants to compare result -files that includes error messages - -@cindex @code{no-pager}, @code{mysql} option -@item --no-pager -Disable pager and print to stdout. See interactive help (\h) also. - -@cindex @code{no-tee}, @code{mysql} option -@item --no-tee -Disable outfile. See interactive help (\h) also. - -@cindex @code{unbuffered}, @code{mysql} option -@item -n, --unbuffered -Flush buffer after each query. - -@cindex @code{skip-column-names}, @code{mysql} option -@item -N, --skip-column-names -Don't write column names in results. - -@cindex @code{set-variable}, @code{mysql} option -@item -O, --set-variable var=option -Give a variable a value. @code{--help} lists variables. -Please note that @code{--set-variable} is deprecated since -@strong{MySQL 4.0}, just use @code{--var=option} instead. - -@cindex @code{one-database}, @code{mysql} option -@item -o, --one-database -Only update the default database. This is useful for skipping updates to -other database in the update log. - -@cindex @code{pager}, @code{mysql} option -@item @code{--pager[=...]} -Output type. Default is your @code{ENV} variable @code{PAGER}. Valid -pagers are less, more, cat [> filename], etc. See interactive help (\h) -also. This option does not work in batch mode. Pager works only in Unix. - -@cindex @code{password}, @code{mysql} option -@item -p[password], --password[=...] -Password to use when connecting to server. If a password is not given on -the command-line, you will be prompted for it. Note that if you use the -short form @code{-p} you can't have a space between the option and the -password. - -@cindex @code{port}, @code{mysql} option -@item -P --port=... -TCP/IP port number to use for connection. - -@cindex @code{quick}, @code{mysql} option -@item -q, --quick -Don't cache result, print it row-by-row. This may slow down the server -if the output is suspended. Doesn't use history file. - -@cindex @code{raw}, @code{mysql} option -@item -r, --raw -Write column values without escape conversion. Used with @code{--batch} - -@cindex @code{silent}, @code{mysql} option -@item -s, --silent -Be more silent. - -@cindex @code{socket}, @code{mysql} option -@item -S --socket=... -Socket file to use for connection. - -@cindex @code{table}, @code{mysql} option -@item -t --table -Output in table format. This is default in non-batch mode. - -@cindex @code{debug-info}, @code{mysql} option -@item -T, --debug-info -Print some debug information at exit. - -@cindex @code{tee}, @code{mysql} option -@item --tee=... -Append everything into outfile. See interactive help (\h) also. Does not -work in batch mode. - -@cindex @code{user}, @code{mysql} option -@item -u, --user=# -User for login if not current user. - -@cindex @code{safe-updates}, @code{mysql} option -@item -U, --safe-updates[=#], --i-am-a-dummy[=#] -Only allow @code{UPDATE} and @code{DELETE} that uses keys. See below for -more information about this option. You can reset this option if you have -it in your @file{my.cnf} file by using @code{--safe-updates=0}. - -@cindex @code{verbose}, @code{mysql} option -@item -v, --verbose -More verbose output (-v -v -v gives the table output format). - -@cindex @code{version}, @code{mysql} option -@item -V, --version -Output version information and exit. - -@cindex @code{wait}, @code{mysql} option -@item -w, --wait -Wait and retry if connection is down instead of aborting. -@end table - -You can also set the following variables with @code{-O} or -@code{--set-variable}; please note that @code{--set-variable} is -deprecated since @strong{MySQL 4.0}, just use @code{--var=option} instead: - -@cindex timeout, @code{connect_timeout} variable -@cindex @code{connect_timeout} variable -@cindex @code{max_allowed_packet} -@cindex @code{net_buffer_length} -@cindex @code{select_limit} -@cindex @code{max_join_size} -@multitable @columnfractions .25 .10 .65 -@item @strong{Variable Name} @tab @strong{Default} @tab @strong{Description} -@item connect_timeout @tab 0 @tab Number of seconds before timeout connection. -@item max_allowed_packet @tab 16777216 @tab Max packetlength to send/receive from to server -@item net_buffer_length @tab 16384 @tab Buffer for TCP/IP and socket communication -@item select_limit @tab 1000 @tab Automatic limit for SELECT when using --i-am-a-dummy -@item max_join_size @tab 1000000 @tab Automatic limit for rows in a join when using --i-am-a-dummy. -@end multitable - -If you type 'help' on the command-line, @code{mysql} will print out the -commands that it supports: - -@cindex commands, list of -@example -mysql> help - -MySQL commands: -help (\h) Display this text. -? (\h) Synonym for `help'. -clear (\c) Clear command. -connect (\r) Reconnect to the server. - Optional arguments are db and host. -edit (\e) Edit command with $EDITOR. -ego (\G) Send command to mysql server, - display result vertically. -exit (\q) Exit mysql. Same as quit. -go (\g) Send command to mysql server. -nopager (\n) Disable pager, print to stdout. -notee (\t) Don't write into outfile. -pager (\P) Set PAGER [to_pager]. - Print the query results via PAGER. -print (\p) Print current command. -prompt (\R) Change your mysql prompt. -quit (\q) Quit mysql. -rehash (\#) Rebuild completion hash. -source (\.) Execute a SQL script file. - Takes a file name as an argument. -status (\s) Get status information from the server. -tee (\T) Set outfile [to_outfile]. - Append everything into given outfile. -use (\u) Use another database. - Takes database name as argument. -@end example - -The @code{pager} command works only in Unix. - -@cindex @code{status} command -The @code{status} command gives you some information about the -connection and the server you are using. If you are running in the -@code{--safe-updates} mode, @code{status} will also print the values for -the @code{mysql} variables that affect your queries. - -@cindex @code{safe-mode} command -A useful startup option for beginners (introduced in MySQL -Version 3.23.11) is @code{--safe-updates} (or @code{--i-am-a-dummy} for -users that has at some time done a @code{DELETE FROM table_name} but -forgot the @code{WHERE} clause). When using this option, @code{mysql} -sends the following command to the MySQL server when opening -the connection: - -@example -SET SQL_SAFE_UPDATES=1,SQL_SELECT_LIMIT=#select_limit#, - SQL_MAX_JOIN_SIZE=#max_join_size#" -@end example - -where @code{#select_limit#} and @code{#max_join_size#} are variables that -can be set from the @code{mysql} command-line. @xref{SET OPTION, @code{SET}}. - -The effect of the above is: - -@itemize @bullet -@item -You are not allowed to do an @code{UPDATE} or @code{DELETE} statement -if you don't have a key constraint in the @code{WHERE} part. One can, -however, force an @code{UPDATE/DELETE} by using @code{LIMIT}: -@example -UPDATE table_name SET not_key_column=# WHERE not_key_column=# LIMIT 1; -@end example -@item -All big results are automatically limited to @code{#select_limit#} rows. -@item -@code{SELECT}s that will probably need to examine more than -@code{#max_join_size} row combinations will be aborted. -@end itemize - -Some useful hints about the @code{mysql} client: - -Some data is much more readable when displayed vertically, instead of -the usual horizontal box type output. For example longer text, which -includes new lines, is often much easier to be read with vertical -output. - -@example -mysql> SELECT * FROM mails WHERE LENGTH(txt) < 300 lIMIT 300,1\G -*************************** 1. row *************************** - msg_nro: 3068 - date: 2000-03-01 23:29:50 -time_zone: +0200 -mail_from: Monty - reply: monty@@no.spam.com - mail_to: "Thimble Smith" <tim@@no.spam.com> - sbj: UTF-8 - txt: >>>>> "Thimble" == Thimble Smith writes: - -Thimble> Hi. I think this is a good idea. Is anyone familiar with UTF-8 -Thimble> or Unicode? Otherwise, I'll put this on my TODO list and see what -Thimble> happens. - -Yes, please do that. - -Regards, -Monty - file: inbox-jani-1 - hash: 190402944 -1 row in set (0.09 sec) -@end example - -For logging, you can use the @code{tee} option. The @code{tee} can be -started with option @code{--tee=...}, or from the command-line -interactively with command @code{tee}. All the data displayed on the -screen will also be appended into a given file. This can be very useful -for debugging purposes also. The @code{tee} can be disabled from the -command-line with command @code{notee}. Executing @code{tee} again -starts logging again. Without a parameter the previous file will be -used. Note that @code{tee} will flush the results into the file after -each command, just before the command-line appears again waiting for the -next command. - -Browsing, or searching the results in the interactive mode in Unix less, -more, or any other similar program, is now possible with option -@code{--pager[=...]}. Without argument, @code{mysql} client will look -for environment variable PAGER and set @code{pager} to that. -@code{pager} can be started from the interactive command-line with -command @code{pager} and disabled with command @code{nopager}. The -command takes an argument optionally and the @code{pager} will be set to -that. Command @code{pager} can be called without an argument, but this -requires that the option @code{--pager} was used, or the @code{pager} -will default to stdout. @code{pager} works only in Unix, since it uses -the popen() function, which doesn't exist in Windows. In Windows, the -@code{tee} option can be used instead, although it may not be as handy -as @code{pager} can be in some situations. - -A few tips about @code{pager}: -@itemize @bullet -@item -You can use it to write to a file: -@example -mysql> pager cat > /tmp/log.txt -@end example -and the results will only go to a file. You can also pass any options -for the programs that you want to use with the @code{pager}: -@example -mysql> pager less -n -i -S -@end example - -@item -From the above do note the option '-S'. You may find it very useful when -browsing the results; try the option with horizontal output (end -commands with '\g', or ';') and with vertical output (end commands with -'\G'). Sometimes a very wide result set is hard to be read from the screen, -with option -S to less you can browse the results within the interactive -less from left to right, preventing lines longer than your screen from -being continued to the next line. This can make the result set much more -readable. You can swith the mode between on and off within the interactive -less with '-S'. See the 'h' for more help about less. - -@item -You can combine very complex ways to handle the results, for example the -following would send the results to two files in two different -directories, on two different hard-disks mounted on /dr1 and /dr2, yet -let the results still be seen on the screen via less: -@example -mysql> pager cat | tee /dr1/tmp/res.txt | \ -tee /dr2/tmp/res2.txt | less -n -i -S -@end example - -@end itemize - -You can also combine the two functions above; have the @code{tee} -enabled, @code{pager} set to 'less' and you will be able to browse the -results in unix 'less' and still have everything appended into a file -the same time. The difference between Unix @code{tee} used with the -@code{pager} and the @code{mysql} client in-built @code{tee}, is that -the in-built @code{tee} works even if you don't have the Unix @code{tee} -available. The in-built @code{tee} also logs everything that is printed -on the screen, where the Unix @code{tee} used with @code{pager} doesn't -log quite that much. Last, but not least, the interactive @code{tee} is -more handy to switch on and off, when you want to log something into a -file, but want to be able to turn the feature off sometimes. - -@cindex @code{prompt} command -From MySQL version 4.0.2 it is possible to change the prompt in the -@code{mysql} command-line client. - -You can use the following prompt options: -@c FIX these columnfractions have NOT been measured! -@multitable @columnfractions .10 .50 -@item @strong{Option} @tab @strong{Description} -@item \v @tab mysqld version -@item \d @tab database in use -@item \h @tab host connected to -@item \p @tab port connected on -@item \u @tab username -@item \U @tab full username@@host -@item \\ @tab @samp{\} -@item \n @tab new line break -@item \t @tab tab -@item \ @tab space -@item \_ @tab space -@item \R @tab military hour time (0-23) -@item \r @tab standard hour time (1-12) -@item \m @tab minutes -@item \y @tab two digit year -@item \Y @tab four digit year -@item \D @tab full date format -@item \s @tab seconds -@item \w @tab day of the week in three letter format (Mon, Tue, ...) -@item \P @tab am/pm -@item \o @tab month in number format -@item \O @tab month in three letter format (Jan, Feb, ...) -@item \c @tab counter that counts up for each command you do -@end multitable - -@samp{\} followed by any other letter just becomes that letter. - -You may set the prompt in the following places: - -@table @strong -@item Environment Variable -You may set the @code{MYSQL_PS1} environment variable to a prompt string. For -example: - -@example -shell> export MYSQL_PS1="(\u@@\h) [\d]> " -@end example - -@item @file{my.cnf} -@item @file{.my.cnf} -You may set the @code{prompt} option in any MySQL configuration file, in the -@code{mysql} group. For example: - -@example -[mysql] -prompt=(\u@@\h) [\d]>\_ -@end example - -@item Command Line -You may set the @code{--prompt} option on the command line to @code{mysql}. -For example: - -@example -shell> mysql --prompt="(\u@@\h) [\d]> " - -(user@@host) [database]> -@end example - -@item Interactively -You may also use the @code{prompt} (or @code{\R}) command to change your -prompt interactively. For example: - -@example -mysql> prompt (\u@@\h) [\d]>\_ -PROMPT set to '(\u@@\h) [\d]>\_' -(user@@host) [database]> -(user@@host) [database]> prompt -Returning to default PROMPT of mysql> -mysql> -@end example - -@end table - - -@node mysqladmin, Using mysqlcheck, mysql, Client-Side Scripts -@subsection @code{mysqladmin}, Administrating a MySQL Server - -@cindex administration, server -@cindex server administration -@cindex @code{mysqladmin} - -A utility for performing administrative operations. The syntax is: - -@example -shell> mysqladmin [OPTIONS] command [command-option] command ... -@end example - -You can get a list of the options your version of @code{mysqladmin} supports -by executing @code{mysqladmin --help}. - -The current @code{mysqladmin} supports the following commands: - -@table @code -@item create databasename -Create a new database. - -@item drop databasename -Delete a database and all its tables. - -@item extended-status -Gives an extended status message from the server. - -@item flush-hosts -Flush all cached hosts. - -@item flush-logs -Flush all logs. - -@item flush-tables -Flush all tables. - -@item flush-privileges -Reload grant tables (same as reload). - -@item kill id,id,... -Kill mysql threads. - -@item password -Set a new password. Change old password to new-password. - -@item ping -Check if mysqld is alive. - -@item processlist -Show list of active threads in server. - -@item reload -Reload grant tables. - -@item refresh -Flush all tables and close and open logfiles. - -@item shutdown -Take server down. - -@item slave-start -Start slave replication thread. - -@item slave-stop -Stop slave replication thread. - -@item status -Gives a short status message from the server. - -@item variables -Prints variables available. - -@item version -Get version info from server. -@end table - -All commands can be shortened to their unique prefix. For example: - -@example -shell> mysqladmin proc stat -+----+-------+-----------+----+-------------+------+-------+------+ -| Id | User | Host | db | Command | Time | State | Info | -+----+-------+-----------+----+-------------+------+-------+------+ -| 6 | monty | localhost | | Processlist | 0 | | | -+----+-------+-----------+----+-------------+------+-------+------+ -Uptime: 10077 Threads: 1 Questions: 9 Slow queries: 0 -Opens: 6 Flush tables: 1 Open tables: 2 -Memory in use: 1092K Max memory used: 1116K -@end example - -@cindex status command, results -The @code{mysqladmin status} command result has the following columns: - -@cindex uptime -@multitable @columnfractions .20 .65 -@item @strong{Column} @tab @strong{Description} -@item Uptime @tab Number of seconds the MySQL server has been up. -@cindex threads -@item Threads @tab Number of active threads (clients). -@cindex questions -@item Questions @tab Number of questions from clients since @code{mysqld} was started. -@cindex slow queries -@item Slow queries @tab Queries that have taken more than @code{long_query_time} seconds. @xref{Slow query log}. -@cindex opens -@item Opens @tab How many tables @code{mysqld} has opened. -@cindex flush tables -@cindex tables, flush -@item Flush tables @tab Number of @code{flush ...}, @code{refresh}, and @code{reload} commands. -@cindex open tables -@item Open tables @tab Number of tables that are open now. -@cindex memory use -@item Memory in use @tab Memory allocated directly by the @code{mysqld} code (only available when MySQL is compiled with --with-debug=full). -@cindex max memory used -@item Max memory used @tab Maximum memory allocated directly by the @code{mysqld} code (only available when MySQL is compiled with --with-debug=full). -@end multitable - -If you do @code{mysqladmin shutdown} on a socket (in other words, on a -the computer where @code{mysqld} is running), @code{mysqladmin} will -wait until the MySQL @code{pid-file} is removed to ensure that -the @code{mysqld} server has stopped properly. - - -@node Using mysqlcheck, mysqldump, mysqladmin, Client-Side Scripts -@subsection Using @code{mysqlcheck} for Table Maintenance and Crash Recovery - -Since MySQL version 3.23.38 you will be able to use a new -checking and repairing tool for @code{MyISAM} tables. The difference to -@code{myisamchk} is that @code{mysqlcheck} should be used when the -@code{mysqld} server is running, where as @code{myisamchk} should be used -when it is not. The benefit is that you no longer have to take the -server down for checking or repairing your tables. - -@code{mysqlcheck} uses MySQL server commands @code{CHECK}, -@code{REPAIR}, @code{ANALYZE} and @code{OPTIMIZE} in a convenient way -for the user. - -There are three alternative ways to invoke @code{mysqlcheck}: - -@example -shell> mysqlcheck [OPTIONS] database [tables] -shell> mysqlcheck [OPTIONS] --databases DB1 [DB2 DB3...] -shell> mysqlcheck [OPTIONS] --all-databases -@end example - -So it can be used in a similar way as @code{mysqldump} when it -comes to what databases and tables you want to choose. - -@code{mysqlcheck} does have a special feature compared to the other -clients; the default behaviour, checking tables (-c), can be changed by -renaming the binary. So if you want to have a tool that repairs tables -by default, you should just copy @code{mysqlcheck} to your harddrive -with a new name, @code{mysqlrepair}, or alternatively make a symbolic -link to @code{mysqlrepair} and name the symbolic link as -@code{mysqlrepair}. If you invoke @code{mysqlrepair} now, it will repair -tables by default. - -The names that you can use to change @code{mysqlcheck} default behaviour -are here: - -@example -mysqlrepair: The default option will be -r -mysqlanalyze: The default option will be -a -mysqloptimize: The default option will be -o -@end example - -The options available for @code{mysqlcheck} are listed here, please -check what your version supports with @code{mysqlcheck --help}. - -@table @code -@item -A, --all-databases -Check all the databases. This will be same as --databases with all -databases selected -@item -1, --all-in-1 -Instead of making one query for each table, execute all queries in 1 -query separately for each database. Table names will be in a comma -separated list. -@item -a, --analyze -Analyse given tables. -@item --auto-repair -If a checked table is corrupted, automatically fix it. Repairing will be -done after all tables have been checked, if corrupted ones were found. -@item -#, --debug=... -Output debug log. Often this is 'd:t:o,filename' -@item --character-sets-dir=... -Directory where character sets are -@item -c, --check -Check table for errors -@item -C, --check-only-changed -Check only tables that have changed since last check or haven't been -closed properly. -@item --compress -Use compression in server/client protocol. -@item -?, --help -Display this help message and exit. -@item -B, --databases -To check several databases. Note the difference in usage; in this case -no tables are given. All name arguments are regarded as database names. -@item --default-character-set=... -Set the default character set -@item -F, --fast -Check only tables that hasn't been closed properly -@item -f, --force -Continue even if we get an sql-error. -@item -e, --extended -If you are using this option with CHECK TABLE, it will ensure that the -table is 100 percent consistent, but will take a long time. - -If you are using this option with REPAIR TABLE, it will run an extended -repair on the table, which may not only take a long time to execute, but -may produce a lot of garbage rows also! -@item -h, --host=... -Connect to host. -@item -m, --medium-check -Faster than extended-check, but only finds 99.99 percent of all -errors. Should be good enough for most cases. -@item -o, --optimize -Optimise table -@item -p, --password[=...] -Password to use when connecting to server. If password is not given -it's solicited on the tty. -@item -P, --port=... -Port number to use for connection. -@item -q, --quick -If you are using this option with CHECK TABLE, it prevents the check -from scanning the rows to check for wrong links. This is the fastest -check. - -If you are using this option with REPAIR TABLE, it will try to repair -only the index tree. This is the fastest repair method for a table. -@item -r, --repair -Can fix almost anything except unique keys that aren't unique. -@item -s, --silent -Print only error messages. -@item -S, --socket=... -Socket file to use for connection. -@item --tables -Overrides option --databases (-B). -@item -u, --user=# -User for login if not current user. -@item -v, --verbose -Print info about the various stages. -@item -V, --version -Output version information and exit. -@end table - - -@node mysqldump, mysqlhotcopy, Using mysqlcheck, Client-Side Scripts -@subsection @code{mysqldump}, Dumping Table Structure and Data - -@cindex dumping, databases -@cindex databases, dumping -@cindex tables, dumping -@cindex backing up, databases - -@cindex @code{mysqldump} -Utility to dump a database or a collection of database for backup or for -transferring the data to another SQL server (not necessarily a MySQL -server). The dump will contain SQL statements to create the table -and/or populate the table. - -If you are doing a backup on the server, you should consider using -the @code{mysqlhotcopy} instead. @xref{mysqlhotcopy, , @code{mysqlhotcopy}}. - -@example -shell> mysqldump [OPTIONS] database [tables] -OR mysqldump [OPTIONS] --databases [OPTIONS] DB1 [DB2 DB3...] -OR mysqldump [OPTIONS] --all-databases [OPTIONS] -@end example - -If you don't give any tables or use the @code{--databases} or -@code{--all-databases}, the whole database(s) will be dumped. - -You can get a list of the options your version of @code{mysqldump} supports -by executing @code{mysqldump --help}. - -Note that if you run @code{mysqldump} without @code{--quick} or -@code{--opt}, @code{mysqldump} will load the whole result set into -memory before dumping the result. This will probably be a problem if -you are dumping a big database. - -Note that if you are using a new copy of the @code{mysqldump} program -and you are going to do a dump that will be read into a very old MySQL -server, you should not use the @code{--opt} or @code{-e} options. - -@code{mysqldump} supports the following options: - -@table @code -@item --add-locks -Add @code{LOCK TABLES} before and @code{UNLOCK TABLE} after each table dump. -(To get faster inserts into MySQL.) -@item --add-drop-table -Add a @code{drop table} before each create statement. -@item -A, --all-databases -Dump all the databases. This will be same as @code{--databases} with all -databases selected. -@item -a, --all -Include all MySQL-specific create options. -@item --allow-keywords -Allow creation of column names that are keywords. This works by -prefixing each column name with the table name. -@item -c, --complete-insert -Use complete insert statements (with column names). -@item -C, --compress -Compress all information between the client and the server if both support -compression. -@item -B, --databases -To dump several databases. Note the difference in usage. In this case -no tables are given. All name arguments are regarded as database names. -@code{USE db_name;} will be included in the output before each new database. -@item --delayed -Insert rows with the @code{INSERT DELAYED} command. -@item -e, --extended-insert -Use the new multiline @code{INSERT} syntax. (Gives more compact and -faster inserts statements.) -@item -#, --debug[=option_string] -Trace usage of the program (for debugging). -@item --help -Display a help message and exit. -@item --fields-terminated-by=... -@itemx --fields-enclosed-by=... -@itemx --fields-optionally-enclosed-by=... -@itemx --fields-escaped-by=... -@itemx --lines-terminated-by=... -These options are used with the @code{-T} option and have the same -meaning as the corresponding clauses for @code{LOAD DATA INFILE}. -@xref{LOAD DATA, , @code{LOAD DATA}}. -@item -F, --flush-logs -Flush log file in the MySQL server before starting the dump. -@item -f, --force, -Continue even if we get a SQL error during a table dump. -@item -h, --host=.. -Dump data from the MySQL server on the named host. The default host -is @code{localhost}. -@item -l, --lock-tables. -Lock all tables before starting the dump. The tables are locked with -@code{READ LOCAL} to allow concurrent inserts in the case of @code{MyISAM} -tables. - -Please note that when dumping multiple databases, @code{--lock-tables} -will lock tables for each database separately. So using this option will -not guarantee your tables will be logically consistent between databases. -Tables in different databases may be dumped in completely different -states. -@item -K, --disable-keys -@code{/*!40000 ALTER TABLE tb_name DISABLE KEYS */;} and -@code{/*!40000 ALTER TABLE tb_name ENABLE KEYS */;} -will be put in the output. This will make loading the data into a MySQL -4.0 server faster as the indexes are created after all data are inserted. -@item -n, --no-create-db -@code{CREATE DATABASE /*!32312 IF NOT EXISTS*/ db_name;} will not be put in the -output. The above line will be added otherwise, if a @code{--databases} or -@code{--all-databases} option was given. -@item -t, --no-create-info -Don't write table creation information (the @code{CREATE TABLE} statement). -@item -d, --no-data -Don't write any row information for the table. This is very useful if you -just want to get a dump of the structure for a table! -@item --opt -Same as @code{--quick --add-drop-table --add-locks --extended-insert ---lock-tables}. Should give you the fastest possible dump for reading -into a MySQL server. -@item -pyour_pass, --password[=your_pass] -The password to use when connecting to the server. If you specify -no @samp{=your_pass} part, -@code{mysqldump} you will be prompted for a password. -@item -P port_num, --port=port_num -The TCP/IP port number to use for connecting to a host. (This is used for -connections to hosts other than @code{localhost}, for which Unix sockets are -used.) -@item -q, --quick -Don't buffer query, dump directly to stdout. Uses @code{mysql_use_result()} -to do this. -@item -Q, --quote-names -Quote table and column names within @samp{`} characters. -@item -r, --result-file=... -Direct output to a given file. This option should be used in MSDOS, -because it prevents new line @samp{\n} from being converted to @samp{\n\r} -(new line + carriage return). -@item --single-transaction -This option issues a @code{BEGIN} SQL command before dumping data from -server. It is mostly useful with @code{InnoDB} tables and -@code{READ_COMMITTED} transaction isolation level, as in this mode it -will dump the consistent state of the database at the time then -@code{BEGIN} was issued without blocking any applications. - -When using this option you should keep in mind that only transactional -tables will be dumped in a consistent state, e.g., any @code{MyISAM} or -@code{HEAP} tables dumped while using this option may still change -state. - -The @code{--single-transaction} option was added in version 4.0.2. -This option is mutually exclusive with the @code{--lock-tables} option -as @code{LOCK TABLES} already commits a previous transaction internally. -@item -S /path/to/socket, --socket=/path/to/socket -The socket file to use when connecting to @code{localhost} (which is the -default host). -@item --tables -Overrides option --databases (-B). -@item -T, --tab=path-to-some-directory -Creates a @code{table_name.sql} file, that contains the SQL CREATE commands, -and a @code{table_name.txt} file, that contains the data, for each give table. -The format of the @file{.txt} file is made according to the -@code{--fields-xxx} and @code{--lines--xxx} options. -@strong{Note}: This option only works if @code{mysqldump} is run on the same -machine as the @code{mysqld} daemon, and the user/group that @code{mysqld} -is running as (normally user @code{mysql}, group @code{mysql}) needs to have -permission to create/write a file at the location you specify. -@item -u user_name, --user=user_name -The MySQL user name to use when connecting to the server. The -default value is your Unix login name. -@item -O var=option, --set-variable var=option -Set the value of a variable. The possible variables are listed below. -Please note that @code{--set-variable} is deprecated since -@strong{MySQL 4.0}, just use @code{--var=option} instead. -@item -v, --verbose -Verbose mode. Print out more information on what the program does. -@item -V, --version -Print version information and exit. -@item -w, --where='where-condition' -Dump only selected records. Note that quotes are mandatory: -@item -X, --xml -Dumps a database as well formed XML -@item -x, --first-slave -Locks all tables across all databases. - -@example -"--where=user='jimf'" "-wuserid>1" "-wuserid<1" -@end example -@item -O net_buffer_length=#, where # < 16M -When creating multi-row-insert statements (as with option -@code{--extended-insert} or @code{--opt}), @code{mysqldump} will create -rows up to @code{net_buffer_length} length. If you increase this -variable, you should also ensure that the @code{max_allowed_packet} -variable in the MySQL server is bigger than the -@code{net_buffer_length}. -@end table - -The most normal use of @code{mysqldump} is probably for making a backup of -whole databases. @xref{Backup}. - -@example -mysqldump --opt database > backup-file.sql -@end example - -You can read this back into MySQL with: - -@example -mysql database < backup-file.sql -@end example - -or - -@example -mysql -e "source /patch-to-backup/backup-file.sql" database -@end example - -However, it's also very useful to populate another MySQL server with -information from a database: - -@example -mysqldump --opt database | mysql ---host=remote-host -C database -@end example - -It is possible to dump several databases with one command: - -@example -mysqldump --databases database1 [database2 ...] > my_databases.sql -@end example - -If all the databases are wanted, one can use: - -@example -mysqldump --all-databases > all_databases.sql -@end example - - -@node mysqlhotcopy, mysqlimport, mysqldump, Client-Side Scripts -@subsection @code{mysqlhotcopy}, Copying MySQL Databases and Tables - -@cindex dumping, databases -@cindex databases, dumping -@cindex tables, dumping -@cindex backing up, databases - -@code{mysqlhotcopy} is a Perl script that uses @code{LOCK TABLES}, -@code{FLUSH TABLES} and @code{cp} or @code{scp} to quickly make a backup -of a database. It's the fastest way to make a backup of the database -or single tables, but it can only be run on the same machine where the -database directories are. - -@example -mysqlhotcopy db_name [/path/to/new_directory] - -mysqlhotcopy db_name_1 ... db_name_n /path/to/new_directory - -mysqlhotcopy db_name./regex/ -@end example - -@code{mysqlhotcopy} supports the following options: - -@table @code -@item -?, --help -Display a help screen and exit -@item -u, --user=# -User for database login -@item -p, --password=# -Password to use when connecting to server -@item -P, --port=# -Port to use when connecting to local server -@item -S, --socket=# -Socket to use when connecting to local server -@item --allowold -Don't abort if target already exists (rename it _old) -@item --keepold -Don't delete previous (now renamed) target when done -@item --noindices -Don't include full index files in copy to make the backup smaller and faster -The indexes can later be reconstructed with @code{myisamchk -rq.}. -@item --method=# -Method for copy (@code{cp} or @code{scp}). -@item -q, --quiet -Be silent except for errors -@item --debug -Enable debug -@item -n, --dryrun -Report actions without doing them -@item --regexp=# -Copy all databases with names matching regexp -@item --suffix=# -Suffix for names of copied databases -@item --checkpoint=# -Insert checkpoint entry into specified db.table -@item --flushlog -Flush logs once all tables are locked. -@item --tmpdir=# -Temporary directory (instead of /tmp). -@end table - -You can use @code{perldoc mysqlhotcopy} to get more complete -documentation for @code{mysqlhotcopy}. - -@code{mysqlhotcopy} reads the groups @code{[client]} and @code{[mysqlhotcopy]} -from the option files. - -To be able to execute @code{mysqlhotcopy} you need write access to the -backup directory, the @code{SELECT} privilege for the tables you are about to -copy and the MySQL @code{RELOAD} privilege (to be able to -execute @code{FLUSH TABLES}). - - -@node mysqlimport, mysqlshow, mysqlhotcopy, Client-Side Scripts -@subsection @code{mysqlimport}, Importing Data from Text Files - -@cindex importing, data -@cindex data, importing -@cindex files, text -@cindex text files, importing -@cindex @code{mysqlimport} - -@code{mysqlimport} provides a command-line interface to the @code{LOAD DATA -INFILE} SQL statement. Most options to @code{mysqlimport} correspond -directly to the same options to @code{LOAD DATA INFILE}. -@xref{LOAD DATA, , @code{LOAD DATA}}. - -@code{mysqlimport} is invoked like this: - -@example -shell> mysqlimport [options] database textfile1 [textfile2 ...] -@end example - -For each text file named on the command-line, -@code{mysqlimport} strips any extension from the filename and uses the result -to determine which table to import the file's contents into. For example, -files named @file{patient.txt}, @file{patient.text}, and @file{patient} would -all be imported into a table named @code{patient}. - -@code{mysqlimport} supports the following options: - -@table @code -@item -c, --columns=... -This option takes a comma-separated list of field names as an argument. -The field list is used to create a proper @code{LOAD DATA INFILE} command, -which is then passed to MySQL. @xref{LOAD DATA, , @code{LOAD DATA}}. - -@item -C, --compress -Compress all information between the client and the server if both support -compression. - -@item -#, --debug[=option_string] -Trace usage of the program (for debugging). - -@item -d, --delete -Empty the table before importing the text file. - -@item --fields-terminated-by=... -@itemx --fields-enclosed-by=... -@itemx --fields-optionally-enclosed-by=... -@itemx --fields-escaped-by=... -@itemx --lines-terminated-by=... -These options have the same meaning as the corresponding clauses for -@code{LOAD DATA INFILE}. @xref{LOAD DATA, , @code{LOAD DATA}}. - -@item -f, --force -Ignore errors. For example, if a table for a text file doesn't exist, -continue processing any remaining files. Without @code{--force}, -@code{mysqlimport} exits if a table doesn't exist. - -@item --help -Display a help message and exit. - -@item -h host_name, --host=host_name -Import data to the MySQL server on the named host. The default host -is @code{localhost}. - -@item -i, --ignore -See the description for the @code{--replace} option. - -@item -l, --lock-tables -Lock @strong{all} tables for writing before processing any text files. This -ensures that all tables are synchronised on the server. - -@item -L, --local -Read input files from the client. By default, text files are assumed to be on -the server if you connect to @code{localhost} (which is the default host). - -@item -pyour_pass, --password[=your_pass] -The password to use when connecting to the server. If you specify -no @samp{=your_pass} part, -@code{mysqlimport} you will be prompted for a password. - -@item -P port_num, --port=port_num -The TCP/IP port number to use for connecting to a host. (This is used for -connections to hosts other than @code{localhost}, for which Unix sockets are -used.) - -@item -r, --replace -The @code{--replace} and @code{--ignore} options control handling of input -records that duplicate existing records on unique key values. If you specify -@code{--replace}, new rows replace existing rows that have the same unique key -value. If you specify @code{--ignore}, input rows that duplicate an existing -row on a unique key value are skipped. If you don't specify either option, an -error occurs when a duplicate key value is found, and the rest of the text -file is ignored. - -@item -s, --silent -Silent mode. Write output only when errors occur. - -@item -S /path/to/socket, --socket=/path/to/socket -The socket file to use when connecting to @code{localhost} (which is the -default host). - -@item -u user_name, --user=user_name -The MySQL user name to use when connecting to the server. The -default value is your Unix login name. - -@item -v, --verbose -Verbose mode. Print out more information what the program does. - -@item -V, --version -Print version information and exit. -@end table - -Here is a sample run using @code{mysqlimport}: - -@example -$ mysql --version -mysql Ver 9.33 Distrib 3.22.25, for pc-linux-gnu (i686) -$ uname -a -Linux xxx.com 2.2.5-15 #1 Mon Apr 19 22:21:09 EDT 1999 i586 unknown -$ mysql -e 'CREATE TABLE imptest(id INT, n VARCHAR(30))' test -$ ed -a -100 Max Sydow -101 Count Dracula -. -w imptest.txt -32 -q -$ od -c imptest.txt -0000000 1 0 0 \t M a x S y d o w \n 1 0 -0000020 1 \t C o u n t D r a c u l a \n -0000040 -$ mysqlimport --local test imptest.txt -test.imptest: Records: 2 Deleted: 0 Skipped: 0 Warnings: 0 -$ mysql -e 'SELECT * FROM imptest' test -+------+---------------+ -| id | n | -+------+---------------+ -| 100 | Max Sydow | -| 101 | Count Dracula | -+------+---------------+ -@end example - - -@node mysqlshow, perror, mysqlimport, Client-Side Scripts -@subsection Showing Databases, Tables, and Columns - -@cindex databases, displaying -@cindex displaying, database information -@cindex tables, displaying -@cindex columns, displaying -@cindex showing, database information - -@code{mysqlshow} can be used to quickly look at which databases exist, -their tables, and the table's columns. - -With the @code{mysql} program you can get the same information with the -@code{SHOW} commands. @xref{SHOW}. - -@code{mysqlshow} is invoked like this: - -@example -shell> mysqlshow [OPTIONS] [database [table [column]]] -@end example - -@itemize @bullet -@item -If no database is given, all matching databases are shown. -@item -If no table is given, all matching tables in the database are shown. -@item -If no column is given, all matching columns and column types in the table -are shown. -@end itemize - -Note that in newer MySQL versions, you only see those -database/tables/columns for which you have some privileges. - -If the last argument contains a shell or SQL wildcard (@code{*}, @code{?}, -@code{%} or @code{_}) then only what's matched by the wildcard is shown. -This may cause some confusion when you try to display the columns for a -table with a @code{_} as in this case @code{mysqlshow} only shows you -the table names that match the pattern. This is easily fixed by -adding an extra @code{%} last on the command-line (as a separate -argument). - - -@node perror, Batch Commands, mysqlshow, Client-Side Scripts -@subsection perror, Explaining Error Codes - -@cindex error messages, displaying -@cindex perror - -@cindex errno -@cindex Errcode - -For most system errors MySQL will, in addition to a internal text message, -also print the system error code in one of the following styles: -@code{message ... (errno: #)} or @code{message ... (Errcode: #)}. - -You can find out what the error code means by either examining the -documentation for your system or use the @code{perror} utility. - -@code{perror} prints a description for a system error code, or an MyISAM/ISAM -table handler error code. - -@code{perror} is invoked like this: - -@example -shell> perror [OPTIONS] [ERRORCODE [ERRORCODE...]] - -Example: - -shell> perror 13 64 -Error code 13: Permission denied -Error code 64: Machine is not on the network -@end example - -Note that the error messages are mostly system dependent! - - -@node Batch Commands, , perror, Client-Side Scripts -@subsection How to Run SQL Commands from a Text File - -The @code{mysql} client typically is used interactively, like this: - -@example -shell> mysql database -@end example - -However, it's also possible to put your SQL commands in a file and tell -@code{mysql} to read its input from that file. To do so, create a text -file @file{text_file} that contains the commands you wish to execute. -Then invoke @code{mysql} as shown here: - -@example -shell> mysql database < text_file -@end example - -You can also start your text file with a @code{USE db_name} statement. In -this case, it is unnecessary to specify the database name on the command -line: - -@example -shell> mysql < text_file -@end example - -If you are already running @code{mysql}, you can execute a SQL -script file using the @code{source} command: - -@example -mysql> source filename; -@end example - -For more information about batch mode, @ref{Batch mode}. - - -@node Log Files, Replication, Client-Side Scripts, MySQL Database Administration -@section The MySQL Log Files - -@cindex Log files - -MySQL has several different log files that can help you find -out what's going on inside @code{mysqld}: - -@multitable @columnfractions .20 .80 -@item @strong{Log file} @tab @strong{Description} -@item The error log @tab Problems encountering starting, running or stopping @code{mysqld}. -@item The isam log @tab Logs all changes to the ISAM tables. Used only for debugging the isam code. -@item The query log @tab Established connections and executed queries. -@item The update log @tab Deprecated: Stores all statements that changes data -@item The binary log @tab Stores all statements that changes something. Used also for replication -@item The slow log @tab Stores all queries that took more than @code{long_query_time} to execute or didn't use indexes. -@end multitable - -All logs can be found in the @code{mysqld} data directory. You can -force @code{mysqld} to reopen the log files (or in some cases -switch to a new log) by executing @code{FLUSH LOGS}. @xref{FLUSH}. - -@menu -* Error log:: The Error Log -* Query log:: The General Query Log -* Update log:: The Update Log -* Binary log:: The Binary Update Log -* Slow query log:: The Slow Query Log -* Log file maintenance:: Log File Maintenance -@end menu - - -@node Error log, Query log, Log Files, Log Files -@subsection The Error Log - -@code{mysqld} writes all errors to the stderr, which the -@code{safe_mysqld} script redirects to a file called -@code{'hostname'.err}. (On Windows, @code{mysqld} writes this directly -to @file{\mysql\data\mysql.err}.) - -This contains information indicating when @code{mysqld} was started and -stopped and also any critical errors found when running. If @code{mysqld} -dies unexpectedly and @code{safe_mysqld} needs to restart @code{mysqld}, -@code{safe_mysqld} will write a @code{restarted mysqld} row in this -file. This log also holds a warning if @code{mysqld} notices a table -that needs to be automatically checked or repaired. - -On some operating systems, the error log will contain a stack trace -for where @code{mysqld} died. This can be used to find out where -@code{mysqld} died. @xref{Using stack trace}. - - -@node Query log, Update log, Error log, Log Files -@subsection The General Query Log - -@cindex query log -@cindex files, query log - -If you want to know what happens within @code{mysqld}, you should start -it with @code{--log[=file]}. This will log all connections and queries -to the log file (by default named @file{'hostname'.log}). This log can -be very useful when you suspect an error in a client and want to know -exactly what @code{mysqld} thought the client sent to it. - -@c Note: this instance of "safe_mysql" should not be changed to "mysqld_safe" -@c because it's a 3.23.x-specific command -Older versions of the @code{mysql.server} script (from MySQL 3.23.4 to 3.23.8) -pass @code{safe_mysqld} a @code{--log} option (enable general query log). -If you need better performance when you start using MySQL in a production -environment, you can remove the @code{--log} option from @code{mysql.server} -or change it to @code{--log-bin}. @xref{Binary log}. - -The entries in this log are written as @code{mysqld} receives the questions. -This may be different from the order in which the statements are executed. -This is in contrast to the update log and the binary log which are written -after the query is executed, but before any locks are released. - - -@node Update log, Binary log, Query log, Log Files -@subsection The Update Log - -@cindex update log -@cindex files, update log - -@strong{Note}: the update log is replaced by the binary -log. @xref{Binary log}. With this you can do anything that you can do -with the update log. - -When started with the @code{--log-update[=file_name]} option, -@code{mysqld} writes a log file containing all SQL commands that update -data. If no filename is given, it defaults to the name of the host -machine. If a filename is given, but it doesn't contain a path, the file -is written in the data directory. If @file{file_name} doesn't have an -extension, @code{mysqld} will create log file names like so: -@file{file_name.###}, where @code{###} is a number that is incremented each -time you execute @code{mysqladmin refresh}, execute @code{mysqladmin -flush-logs}, execute the @code{FLUSH LOGS} statement, or restart the server. - -@strong{Note}: for the above scheme to work, you must not create -your own files with the same filename as the update log + some extensions -that may be regarded as a number, in the directory used by the update log! - -If you use the @code{--log} or @code{-l} options, @code{mysqld} writes a -general log with a filename of @file{hostname.log}, and restarts and -refreshes do not cause a new log file to be generated (although it is closed -and reopened). In this case you can copy it (on Unix) by doing: - -@example -mv hostname.log hostname-old.log -mysqladmin flush-logs -cp hostname-old.log to-backup-directory -rm hostname-old.log -@end example - -Update logging is smart because it logs only statements that really update -data. So an @code{UPDATE} or a @code{DELETE} with a @code{WHERE} that finds no -rows is not written to the log. It even skips @code{UPDATE} statements that -set a column to the value it already has. - -The update logging is done immediately after a query completes but before -any locks are released or any commit is done. This ensures that the log -will be logged in the execution order. - -If you want to update a database from update log files, you could do the -following (assuming your update logs have names of the form -@file{file_name.###}): - -@example -shell> ls -1 -t -r file_name.[0-9]* | xargs cat | mysql -@end example - -@code{ls} is used to get all the log files in the right order. - -This can be useful if you have to revert to backup files after a crash -and you want to redo the updates that occurred between the time of the backup -and the crash. - - -@node Binary log, Slow query log, Update log, Log Files -@subsection The Binary Update Log - -@cindex binary log -@cindex files, binary log - -The intention is that the binary log should replace the update log, so -we recommend you to switch to this log format as soon as possible! - -The binary log contains all information that is available in the update -log in a more efficient format. It also contains information about how long -each query took that updated the database. It doesn't contain queries that -don't modify any data. If you want to log all queries (for example to -find a problem query) you should use the general query log. @xref{Query log}. - -The binary log is also used when you are replicating a slave from a master. -@xref{Replication}. - -When started with the @code{--log-bin[=file_name]} option, @code{mysqld} -writes a log file containing all SQL commands that update data. If no -file name is given, it defaults to the name of the host machine followed -by @code{-bin}. If file name is given, but it doesn't contain a path, the -file is written in the data directory. - -If you supply an extension to @code{--log-bin=filename.extension}, the -extension will be silenty removed. - -To the binary log filename @code{mysqld} will append an extension that -is a number that is incremented each time you execute @code{mysqladmin -refresh}, execute @code{mysqladmin flush-logs}, execute the @code{FLUSH -LOGS} statement or restart the server. A new binary log will also -automatically be created when it reaches @code{max_binlog_size}. You can -delete all not active binary log files with the @code{RESET MASTER} -command. @xref{RESET}. - -You can use the following options to @code{mysqld} to affect what is logged -to the binary log: - -@multitable @columnfractions .38 .62 -@item @strong{Option} @tab @strong{Description} - -@item @code{binlog-do-db=database_name} @tab -Tells the master it should log updates for the specified database, and -exclude all others not explicitly mentioned. -(Example: @code{binlog-do-db=some_database}) - -@item @code{binlog-ignore-db=database_name} @tab -Tells the master that updates to the given database should not be logged -to the binary log (Example: @code{binlog-ignore-db=some_database}) -@end multitable - -To be able to know which different binary log files have been used, -@code{mysqld} will also create a binary log index file that -contains the name of all used binary log files. By default this has the -same name as the binary log file, with the extension @code{'.index'}. -You can change the name of the binary log index file with the -@code{--log-bin-index=[filename]} option. - -If you are using replication, you should not delete old binary log -files until you are sure that no slave will ever need to use them. -One way to do this is to do @code{mysqladmin flush-logs} once a day and then -remove any logs that are more than 3 days old. - -@cindex @code{mysqlbinlog} -You can examine the binary log file with the @code{mysqlbinlog} command. -For example, you can update a MySQL server from the binary log -as follows: - -@example -shell> mysqlbinlog log-file | mysql -h server_name -@end example - -You can also use the @code{mysqlbinlog} program to read the binary log -directly from a remote MySQL server! - -@code{mysqlbinlog --help} will give you more information of how to use -this program! - -If you are using @code{BEGIN [WORK]} or @code{SET AUTOCOMMIT=0}, you must -use the MySQL binary log for backups instead of the old update log. - -The binary logging is done immediately after a query completes but before -any locks are released or any commit is done. This ensures that the log -will be logged in the execution order. - -Updates to non-transactional tables are stored in the binary log -immediately after execution. For transactional tables such as @code{BDB} -or @code{InnoDB} tables, all updates (@code{UPDATE}, @code{DELETE} -or @code{INSERT}) that change tables are cached until a @code{COMMIT} command -is sent to the server. At this point mysqld writes the whole transaction to -the binary log before the @code{COMMIT} is executed. -Every thread will, on start, allocate a buffer of @code{binlog_cache_size} -to buffer queries. If a query is bigger than this, the thread will open -a temporary file to store the transcation. The temporary file will -be deleted when the thread ends. - -The @code{max_binlog_cache_size} (default 4G) can be used to restrict -the total size used to cache a multi-query transaction. If a transaction is -bigger than this it will fail and roll back. - -If you are using the update or binary log, concurrent inserts will -be converted to normal inserts when using @code{CREATE ... SELECT} and -@code{INSERT ... SELECT}. -This is to ensure that you can recreate an exact copy of your tables by -applying the log on a backup. - - -@node Slow query log, Log file maintenance, Binary log, Log Files -@subsection The Slow Query Log - -@cindex slow query log -@cindex files, slow query log - -When started with the @code{--log-slow-queries[=file_name]} option, -@code{mysqld} writes a log file containing all SQL commands that took -more than @code{long_query_time} to execute. The time to get the initial -table locks are not counted as execution time. - -The slow query log is logged after the query is executed and after all -locks has been released. This may be different from the order in which -the statements are executed. - -If no file name is given, it defaults to the name of the host machine -suffixed with @code{-slow.log}. If a filename is given, but doesn't -contain a path, the file is written in the data directory. - -The slow query log can be used to find queries that take a long time to -execute and are thus candidates for optimisation. With a large log, that -can become a difficult task. You can pipe the slow query log through the -@code{mysqldumpslow} command to get a summary of the queries which -appear in the log. - -You are using @code{--log-long-format} then also queries that are not -using indexes are printed. @xref{Command-line options}. - - -@node Log file maintenance, , Slow query log, Log Files -@subsection Log File Maintenance - -@cindex files, log -@cindex maintaining, log files -@cindex log files, maintaining - -The MySQL Server can create a number of different log files, which make -it easy to see what is going on. @xref{Log Files}. One must however -regularly clean up these files, to ensure that the logs don't take up -too much disk space. - -When using MySQL with log files, you will, from time to time, -want to remove/backup old log files and tell MySQL to start -logging on new files. @xref{Backup}. - -On a Linux (@code{Redhat}) installation, you can use the -@code{mysql-log-rotate} script for this. If you installed MySQL -from an RPM distribution, the script should have been installed -automatically. Note that you should be careful with this if you are using -the log for replication! - -On other systems you must install a short script yourself that you -start from @code{cron} to handle log files. - -You can force MySQL to start using new log files by using -@code{mysqladmin flush-logs} or by using the SQL command @code{FLUSH LOGS}. -If you are using MySQL Version 3.21 you must use @code{mysqladmin refresh}. - -The above command does the following: - -@itemize @bullet -@item -If standard logging (@code{--log}) or slow query logging -(@code{--log-slow-queries}) is used, closes and reopens the log file -(@file{mysql.log} and @file{`hostname`-slow.log} as default). -@item -If update logging (@code{--log-update}) is used, closes the update log and -opens a new log file with a higher sequence number. -@end itemize - -If you are using only an update log, you only have to flush the logs and then -move away the old update log files to a backup. -If you are using the normal logging, you can do something like: - -@example -shell> cd mysql-data-directory -shell> mv mysql.log mysql.old -shell> mysqladmin flush-logs -@end example - -and then take a backup and remove @file{mysql.old}. - - -@node Replication, , Log Files, MySQL Database Administration -@section Replication in MySQL - -@cindex replication -@cindex increasing, speed -@cindex speed, increasing -@cindex databases, replicating - -@menu -* Replication Intro:: Introduction -* Replication Implementation:: Replication Implementation Overview -* Replication HOWTO:: How To Set Up Replication -* Replication Features:: Replication Features and Known Problems -* Replication Options:: Replication Options in @file{my.cnf} -* Replication SQL:: SQL Commands Related to Replication -* Replication FAQ:: Replication FAQ -* Replication Problems:: Troubleshooting Replication -@end menu - -This section describes the various replication features in MySQL. -It serves as a reference to the options available with replication. -You will be introduced to replication and learn how to implement it. -Toward the end, there are some frequently asked questions and descriptions -of problems and how to solve them. - -We suggest that you visit our website at @uref{http://www.mysql.com/} -often and read updates to this section. Replication is constantly being -improved, and we update the manual frequently with the most current -information. - -@node Replication Intro, Replication Implementation, Replication, Replication -@subsection Introduction - -One way replication can be used is to increase both robustness and -speed. For robustness you can have two systems and can switch to the backup if -you have problems with the master. The extra speed is achieved by -sending a part of the non-updating queries to the replica server. Of -course this only works if non-updating queries dominate, but that is the -normal case. - -Starting in Version 3.23.15, MySQL supports one-way replication -internally. One server acts as the master, while the other acts as the -slave. Note that one server could play the roles of master in one pair -and slave in the other. The master server keeps a binary log of updates -(@pxref{Binary log}) and an index file to binary logs to keep track of -log rotation. The slave, upon connecting, informs the master where it -left off since the last successfully propagated update, catches up on -the updates, and then blocks and waits for the master to notify it of -the new updates. - -Note that if you are replicating a database, all updates to this -database should be done through the master! - -Another benefit of using replication is that one can get live backups of -the system by doing a backup on a slave instead of doing it on the -master. @xref{Backup}. - - -@node Replication Implementation, Replication HOWTO, Replication Intro, Replication -@subsection Replication Implementation Overview - -@cindex master-slave setup - -MySQL replication is based on the server keeping track of all -changes to your database (updates, deletes, etc) in the binary -log (@pxref{Binary log}) and the slave server(s) reading the saved -queries from the master server's binary log so that the slave can -execute the same queries on its copy of the data. - -It is @strong{very important} to realise that the binary log is simply a -record starting from a fixed point in time (the moment you enable binary -logging). Any slaves which you set up will need copies of all the data -from your master as it existed the moment that you enabled binary -logging on the master. If you start your slaves with data that doesn't -agree with what was on the master @strong{when the binary log was -started}, your slaves may fail. - -Please see the following table for an indication of master-slave -compatibility between different versions. With regard to version 4.0, -we recommend using at least 4.0.4 on both sides. - -@c FIX arjen 2002-07-17 new table, not yet measured for XML/DocBook. -@multitable @columnfractions .10 .15 .15 .10 .10 .10 -@item @tab @tab @strong{Master} @tab @strong{Master} @tab @strong{Master} @tab @strong{Master} -@item @tab @tab @strong{3.23.33 and up} @tab @strong{4.0.0} @tab @strong{4.0.1} @tab @strong{4.0.2} -@item @strong{Slave} @tab @strong{3.23.33 and up} @tab yes @tab no @tab no @tab no -@item @strong{Slave} @tab @strong{4.0.0} @tab no @tab yes @tab no @tab no -@item @strong{Slave} @tab @strong{4.0.1} @tab yes @tab no @tab yes @tab no -@item @strong{Slave} @tab @strong{4.0.2} @tab yes @tab no @tab no @tab yes -@end multitable - -Starting from 4.0.0, one can use @code{LOAD DATA FROM MASTER} to set up -a slave. Be aware that @code{LOAD DATA FROM MASTER} currently works only -if all the tables on the master are @code{MyISAM} type, and will acquire a -global read lock, so no writes are possible while the tables are being -transferred from the master. This limitation is of a temporary nature, and is -due to the fact that we have not yet implemented hot lock-free table backup. -It will be removed in the future 4.0 branch versions once we implement hot -backup enabling @code{LOAD DATA FROM MASTER} to work without blocking master -updates. - -Due to the above limitation, we recommend that at this point you use -@code{LOAD DATA FROM MASTER} only if the dataset on the master is relatively -small, or if a prolonged read lock on the master is acceptable. While the -actual speed of @code{LOAD DATA FROM MASTER} may vary from system to system, -a good rule for a rough estimate of how long it is going to take is 1 second -per 1 MB of the datafile. You will get close to the estimate if both master -and slave are equivalent to 700 MHz Pentium, are connected through -100 MBit/s network, and your index file is about half the size of your data -file. Of course, your mileage will vary from system to system, the above rule -just gives you a rough order of magnitude estimate. - -Once a slave is properly configured and running, it will simply connect -to the master and wait for updates to process. If the master goes away -or the slave loses connectivity with your master, it will keep trying to -connect every @code{master-connect-retry} seconds until it is able to -reconnect and resume listening for updates. - -Each slave keeps track of where it left off. The master server has no -knowledge of how many slaves there are or which ones are up-to-date at -any given time. - -The next section explains the master/slave setup process in more detail. - - -@node Replication HOWTO, Replication Features, Replication Implementation, Replication -@subsection How To Set Up Replication - -Here is a quick description of how to set up complete replication on -your current MySQL server. It assumes you want to replicate all -your databases and have not configured replication before. You will need -to shutdown your master server briefly to complete the steps outlined -here. - -While this method is the most straightforward way to set up a slave, -it is not the only one. For example, if you already have a snapshot -of the master, and -the master already has server id set and binary logging enabled, you can -set up a slave without shutting the master down or even blocking the updates. -For more details, please see @ref{Replication FAQ}. - -If you want to become a real MySQL replication guru, we suggest that you -begin by studying, pondering, and trying all commands -mentioned in @ref{Replication SQL}. You should also familiarise yourself -with replication startup options in @file{my.cnf} in -@ref{Replication Options}. - -@enumerate -@item -Make sure you have a recent version of MySQL installed on the master -and slave(s). - -Use Version 3.23.29 or higher. Previous releases used a different binary -log format and had bugs which have been fixed in newer releases. Please, -do not report bugs until you have verified that the problem is present -in the latest release. - -@item -Set up special a replication user on the master with the @code{FILE} -(in MySQL versions older than 4.0.2) or @code{REPLICATION SLAVE} -privilege in newer MySQL versions. You must also have given permission -to connect from all the slaves. If the user is only doing replication -(which is recommended), you don't need to grant any additional privileges. - -For example, to create a user named @code{repl} which can access your -master from any host, you might use this command: - -@example -mysql> GRANT FILE ON *.* TO repl@@"%" IDENTIFIED BY '<password>'; -@end example - -@item -Shut down MySQL on the master. - -@example -mysqladmin -u root -p<password> shutdown -@end example - -@item -Snapshot all the data on your master server. - -The easiest way to do this (on Unix) is to simply use @strong{tar} to -produce an archive of your entire data directory. The exact data -directory location depends on your installation. - -@example -tar -cvf /tmp/mysql-snapshot.tar /path/to/data-dir -@end example - -Windows users can use @code{WinZIP} or similar software to create an -archive of the data directory. - -@item -In @file{my.cnf} on the master add @code{log-bin} and -@code{server-id=unique number} to the @code{[mysqld]} section and -restart it. It is very important that the id of the slave is different from -the id of the master. Think of @code{server-id} as something similar -to the IP address - it uniquely identifies the server instance in the -community of replication partners. - -@example -[mysqld] -log-bin -server-id=1 -@end example - -@item -Restart MySQL on the master. - -@item -Add the following to @file{my.cnf} on the slave(s): - -@example -master-host=<hostname of the master> -master-user=<replication user name> -master-password=<replication user password> -master-port=<TCP/IP port for master> -server-id=<some unique number between 2 and 2^32-1> -@end example - -replacing the values in <> with what is relevant to your system. - -@code{server-id} must be different for each server participating in -replication. If you don't specify a server-id, it will be set to 1 if -you have not defined @code{master-host}, else it will be set to 2. Note -that in the case of @code{server-id} omission the master will refuse -connections from all slaves, and the slave will refuse to connect to a -master. Thus, omitting @code{server-id} is only good for backup with a -binary log. - - -@item -Copy the snapshot data into your data directory on your slave(s). Make -sure that the privileges on the files and directories are correct. The -user which MySQL runs as needs to be able to read and write to -them, just as on the master. - -@item Restart the slave(s). - -@end enumerate - -After you have done the above, the slave(s) should connect to the master -and catch up on any updates which happened since the snapshot was taken. - -If you have forgotten to set @code{server-id} for the slave you will get -the following error in the error log file: - -@example -Warning: one should set server_id to a non-0 value if master_host is set. -The server will not act as a slave. -@end example - -If you have forgotten to do this for the master, the slaves will not be -able to connect to the master. - -If a slave is not able to replicate for any reason, you will find error -messages in the error log on the slave. - -Once a slave is replicating, you will find a file called -@file{master.info} in the same directory as your error log. The -@file{master.info} file is used by the slave to keep track of how much -of the master's binary log it has processed. @strong{Do not} remove or -edit the file, unless you really know what you are doing. Even in that case, -it is preferred that you use @code{CHANGE MASTER TO} command. - -@node Replication Features, Replication Options, Replication HOWTO, Replication -@subsection Replication Features and Known Problems - -@cindex options, replication -@cindex @file{my.cnf} file -@cindex files,@file{my.cnf} - -Here is an explanation of what is supported and what is not: - -@itemize @bullet -@item -Replication will be done correctly with @code{AUTO_INCREMENT}, -@code{LAST_INSERT_ID()}, and @code{TIMESTAMP} values. -@item -@code{RAND()} in updates does not replicate properly. Use -@code{RAND(some_non_rand_expr)} if you are replicating updates with -@code{RAND()}. You can, for example, use @code{UNIX_TIMESTAMP()} for the -argument to @code{RAND()}. -@item -You have to use the same character set (@code{--default-character-set}) -on the master and the slave. If not, you may get duplicate key errors on -the slave, because a key that is regarded as unique in the master character -set may not be unique in the slave character set. -@item -In 3.23, @code{LOAD DATA INFILE} will be handled properly as long as the file -still resides on the master server at the time of update -propagation. @code{LOAD LOCAL DATA INFILE} will be skipped. In 4.0, this -limitation is not present - all forms of @code{LOAD DATA INFILE} are properly -replicated. -@item -Update queries that use user variables are not replication-safe (yet). -@item -@code{FLUSH} commands are not stored in the binary log and are because -of this not replicated to the slaves. This is not normally a problem as -@code{FLUSH} doesn't change anything. This does however mean that if you -update the MySQL privilege tables directly without using the -@code{GRANT} statement and you replicate the @code{mysql} privilege -database, you must do a @code{FLUSH PRIVILEGES} on your slaves to put -the new privileges into effect. -@item -Temporary tables starting in 3.23.29 are replicated properly with the -exception of the case when you shut down slave server ( not just slave thread), -you have some temporary tables open, and they are used in subsequent updates. -To deal with this problem shutting down the slave, do @code{SLAVE STOP}, -check @code{Slave_open_temp_tables} variable to see if it is 0, then issue -@code{mysqladmin shutdown}. If the number is not 0, restart the slave thread -with @code{SLAVE START} and see -if you have better luck next time. There will be a cleaner solution, but it -has to wait until version 4.0. -In earlier versions temporary tables are not replicated properly - we -recommend that you either upgrade, or execute @code{SET SQL_LOG_BIN=0} on -your clients before all queries with temp tables. -@item -MySQL only supports one master and many slaves. In 4.x, we will -add a voting algorithm to automatically change master if something goes -wrong with the current master. We will also introduce 'agent' processes -to help do load balancing by sending select queries to different -slaves. -@item -Starting in Version 3.23.26, it is safe to connect servers in a circular -master-slave relationship with @code{log-slave-updates} enabled. -Note, however, that many queries will not work right in this kind of -setup unless your client code is written to take care of the potential -problems that can happen from updates that occur in different sequence -on different servers. - -This means that you can do a setup like the following: - -@example -A -> B -> C -> A -@end example - -This setup will only works if you only do non conflicting updates -between the tables. In other words, if you insert data in A and C, you -should never insert a row in A that may have a conflicting key with a -row insert in C. You should also not update the sam rows on two servers -if the order in which the updates are applied matters. - -Note that the log format has changed in Version 3.23.26 so that -pre-3.23.26 slaves will not be able to read it. -@item -If the query on the slave gets an error, the slave thread will -terminate, and a message will appear in the @file{.err} file. You should -then connect to the slave manually, fix the cause of the error (for -example, non-existent table), and then run the @code{SLAVE START} SQL -command (available starting in Version 3.23.16). In Version 3.23.15, you -will have to restart the server. -@item -If connection to the master is lost, the slave will retry immediately, -and then in case of failure every @code{master-connect-retry} (default -60) seconds. Because of this, it is safe to shut down the master, and -then restart it after a while. The slave will also be able to deal with -network connectivity outages. -@item -Shutting down the slave (cleanly) is also safe, as it keeps track of -where it left off. Unclean shutdowns might produce problems, especially -if disk cache was not synced before the system died. Your system fault -tolerance will be greatly increased if you have a good UPS. -@item -If the master is listening on a non-standard port, you will also need to -specify this with @code{master-port} parameter in @file{my.cnf} . -@item -In Version 3.23.15, all of the tables and databases will be -replicated. Starting in Version 3.23.16, you can restrict replication to -a set of databases with @code{replicate-do-db} directives in -@file{my.cnf} or just exclude a set of databases with -@code{replicate-ignore-db}. Note that up until Version 3.23.23, there was a bug -that did not properly deal with @code{LOAD DATA INFILE} if you did it in -a database that was excluded from replication. -@item -Starting in Version 3.23.16, @code{SET SQL_LOG_BIN = 0} will turn off -replication (binary) logging on the master, and @code{SET SQL_LOG_BIN = -1} will turn it back on -- you must have the @code{SUPER} (in MySQL -4.0.2 and above) or @code{PROCESS} (in older MySQL versions) privilege -to do this. -@item -Starting in Version 3.23.19, you can clean up stale replication leftovers when -something goes wrong and you want a clean start with @code{FLUSH MASTER} -and @code{FLUSH SLAVE} commands. In Version 3.23.26 we have renamed them to -@code{RESET MASTER} and @code{RESET SLAVE} respectively to clarify -what they do. The old @code{FLUSH} variants still work, though, for -compatibility. - -@item -Starting in Version 3.23.23, you can change masters and adjust log position -with @code{CHANGE MASTER TO}. -@item -Starting in Version 3.23.23, you tell the master that updates in certain -databases should not be logged to the binary log with @code{binlog-ignore-db}. -@item -Starting in Version 3.23.26, you can use @code{replicate-rewrite-db} to tell -the slave to apply updates from one database on the master to the one -with a different name on the slave. -@item -Starting in Version 3.23.28, you can use @code{PURGE MASTER LOGS TO 'log-name'} -to get rid of old logs while the slave is running. This will remove all old -logs before, but not including @code{'log-name'}. -@item -Due to the non-transactional nature of MyISAM tables, it is possible to have -a query that will only partially update a table and return an error code. This -can happen, for example, on a multi-row insert that has one row violating a -key constraint, or if a long update query is killed after updating some of the -rows. If that happens on the master, the slave thread will exit and wait for -the DBA to decide what to do about it unless the error code is legitimate and -the query execution results in the same error code. If this error code -validation behaviour is not desirable, some ( or all) errors could be masked -out with @code{slave-skip-errors} option starting in Version 3.23.47. -@item -While individual tables can be excluded from replication with -@code{replicate-do-table}/@code{replicate-ignore-table} or -@code{replicate-wild-do-table}/@code{replicate-wild-ignore-table}, there -are currently some design deficiencies that in some rather rare cases -produce unexpected results. The replication protocol does not inform the -slave explicitly which tables are going to be modified by the query -- so -the slave has to parse the query to know this. To avoid redundant -parsing for queries that will end up actually being executed, table -exclusion is currently implemented by sending the query to the standard -MySQL parser, which will short-circuit the query and report success if -it detects that the table should be ignored. In addition to several -inefficiencies, this approach is also more bug prone, and there are two -known bugs as of Version 3.23.49 -- because the parser automatically opens -the table when parsing some queries the ignored table has to exist on -the slave. The other bug is that if the ignored table gets partially -updated, the slave thread will not notice that the table actually should -have been ignored and will suspend the replication process. While the -above bugs are conceptually very simple to fix, we have not yet found a way -to do this without a significant code change that would compromise the stability -status of 3.23 branch. There exists a workaround for both if in the rare case -it happens to affect your application -- use @code{slave-skip-errors}. -@end itemize - - -@node Replication Options, Replication SQL, Replication Features, Replication -@subsection Replication Options in @file{my.cnf} - -If you are using replication, we recommend that you use MySQL Version -3.23.30 or later. Older versions work, but they do have some bugs and are -missing some features. Some of the options mentioned here may not be available in -your version if it is not the most recent one. For all options specific to -the 4.0 branch, there is a note indicating so. Otherwise, if you discover -that the option you are interested in is not available in your 3.23 version, -and you really need it, please upgrade to the most recent 3.23 branch. - -Please be aware that 4.0 branch is still in alpha, so some things may not be -working as smoothly as you would like. If you really would like to try -the new features of 4.0, we recommend you do it in such a way that in -case there is a problem your mission critical applications will not be -disrupted. - -On both master and slave you need to use the @code{server-id} option. -This sets a unique replication id. You should pick a unique value in the -range between 1 to 2^32-1 for each master and slave. -Example: @code{server-id=3} - -The following table describes the options you can use for the @code{MASTER}: - -@multitable @columnfractions .38 .62 -@item @strong{Option} @tab @strong{Description} - -@item @code{log-bin=filename} @tab -Write to a binary update log to the specified location. Note that if you -give it a parameter with an extension (for example, -@code{log-bin=/mysql/logs/replication.log} ) versions up to 3.23.24 will -not work right during replication if you do @code{FLUSH LOGS} . The -problem is fixed in Version 3.23.25. If you are using this kind of log -name, @code{FLUSH LOGS} will be ignored on binlog. To clear the log, run -@code{FLUSH MASTER}, and do not forget to run @code{FLUSH SLAVE} on all -slaves. In Versions 3.23.26 and later, you should use -@code{RESET MASTER} and @code{RESET SLAVE} - -@item @code{log-bin-index=filename} @tab -Because the user could issue the @code{FLUSH LOGS} command, we need to -know which log is currently active and which ones have been rotated out -and in what sequence. This information is stored in the binary log index file. -The default is @file{`hostname`.index}. You should not need to change this. - -Example: @code{log-bin-index=db.index} - -@item @code{sql-bin-update-same} @tab -If set, setting @code{SQL_LOG_BIN} to a value will automatically set -@code{SQL_LOG_UPDATE} to the same value and vice versa. - -@item @code{binlog-do-db=database_name} @tab -Tells the master that it should log updates to the binary log if the -current database is @code{database_name}. All other databases are ignored. -Note that if you use this, you should ensure that you do updates only in -the current database. - -Example: @code{binlog-do-db=sales} - -@item @code{binlog-ignore-db=database_name} @tab -Tells the master that updates where the current database is -@code{database_name} should not be stored in the binary log. Note that if -you use this, you should ensure that you do updates only in the current -database. - -Example: @code{binlog-ignore-db=accounting} -@end multitable - -The following table describes the options you can use for the @code{SLAVE}: - -@multitable @columnfractions .38 .62 -@item @strong{Option} @tab @strong{Description} - -@item @code{master-host=host} @tab -Master hostname or IP address for replication. If not set, the slave -thread will not be started. Note that the setting of @code{master-host} -will be ignored if there exists a valid @file{master.info} file. Probably a -better name for this options would have been something like -@code{bootstrap-master-host}, but it is too late to change now. - -Example: @code{master-host=db-master.mycompany.com} - -@item @code{master-user=username} @tab -The username the slave thread will use for authentication when connecting to -the master. The user must have the @code{FILE} privilege. If the master user -is not set, user @code{test} is assumed. The value in @file{master.info} will -take precedence if it can be read. - -Example: @code{master-user=scott} - -@item @code{master-password=password} @tab -The password the slave thread will authenticate with when connecting to -the master. If not set, an empty password is assumed.The value in -@file{master.info} will take precedence if it can be read. - -Example: @code{master-password=tiger} - -@item @code{master-port=portnumber} @tab -The port the master is listening on. If not set, the compiled setting of -@code{MYSQL_PORT} is assumed. If you have not tinkered with -@code{configure} options, this should be 3306. The value in -@file{master.info} will take precedence if it can be read. - -Example: @code{master-port=3306} - -@item @code{master-connect-retry=seconds} @tab -The number of seconds the slave thread will sleep before retrying to -connect to the master in case the master goes down or the connection is -lost. Default is 60. - -Example: @code{master-connect-retry=60} - -@item @code{master-ssl} @tab -Available after 4.0.0. Turn SSL on for replication. Be warned that is -this is a relatively new feature. - -Example: @code{master-ssl} - -@item @code{master-ssl-key} @tab -Available after 4.0.0. Master SSL keyfile name. Only applies if you have -enabled @code{master-ssl}. - -Example: @code{master-ssl-key=SSL/master-key.pem} - -@item @code{master-ssl-cert} @tab -Available after 4.0.0. Master SSL certificate file name. Only applies if -you have enabled @code{master-ssl}. - - -Example: @code{master-ssl-key=SSL/master-cert.pem} - -@item @code{master-info-file=filename} @tab -The location of the file that remembers where we left off on the master -during the replication process. The default is @file{master.info} in the data -directory. You should not need to change this. - -Example: @code{master-info-file=master.info} - -@item @code{report-host} @tab -Available after 4.0.0. Hostname or IP of the slave to be reported to to -the master during slave registration. Will appear in the output of -@code{SHOW SLAVE HOSTS}. Leave unset if you do not want the slave to -register itself with the master. Note that it is not sufficient for the -master to simply read the IP of the slave off the socket once the slave -connects. Due to @code{NAT} and other routing issues, that IP may not be -valid for connecting to the slave from the master or other hosts. - -Example: @code{report-host=slave1.mycompany.com} - -@item @code{report-port} @tab -Available after 4.0.0. Port for connecting to slave reported to the -master during slave registration. Set it only if the slave is listening -on a non-default port or if you have a special tunnel from the master or -other clients to the slave. If not sure, leave this option unset. - -@item @code{replicate-do-table=db_name.table_name} @tab -Tells the slave thread to restrict replication to the specified table. -To specify more than one table, use the directive multiple times, once -for each table. This will work for cross-database updates, in -contrast to @code{replicate-do-db}. - -Example: @code{replicate-do-table=some_db.some_table} - -@item @code{replicate-ignore-table=db_name.table_name} @tab -Tells the slave thread to not replicate any command that updates the -specified table (even if any other tables may be update by the same -command). To specify more than one table to ignore, use the directive -multiple times, once for each table. This will work for cross-datbase -updates, in contrast to @code{replicate-ignore-db}. - -Example: @code{replicate-ignore-table=db_name.some_table} - -@item @code{replicate-wild-do-table=db_name.table_name} @tab -Tells the slave thread to restrict replication to queries where any of -the updated tables match the specified wildcard pattern. To specify -more than one table, use the directive multiple times, once for each -table. This will work for cross-database updates. - -Example: @code{replicate-wild-do-table=foo%.bar%} will replicate only -updates that uses a table in any databases that start with @code{foo} -and whose table names start with @code{bar}. - -@item @code{replicate-wild-ignore-table=db_name.table_name} @tab -Tells the slave thread to not replicate a query where any table matches the -given wildcard pattern. To specify more than one table to ignore, use -the directive multiple times, once for each table. This will work for -cross-database updates. - -Example: @code{replicate-wild-ignore-table=foo%.bar%} will not do updates -to tables in databases that start with @code{foo} and whose table names start -with @code{bar}. - -@item @code{replicate-ignore-db=database_name} @tab - -Tells the slave thread to not replicate any command where the current -database is @code{database_name}. To specify more than one database to -ignore, use the directive multiple times, once for each database. -You should not use this directive if you are using cross table updates -and you don't want these update to be replicated. - -The main reason for this behaviour is that it's hard from the command -alone know if a query should be replicated or not; For example if you -are using multi-table-delete or multi-table-update commands in MySQL 4.x -that goes across multiple databases. It's also very fast to just check -the current database, as this only has to be done once at connect time -or when the database changes. - -If you need cross database updates to work, make sure you have 3.23.28 -or later, and use @code{replicate-wild-ignore-table=db_name.%}. - -Example: @code{replicate-ignore-db=some_db} - -@item @code{replicate-do-db=database_name} @tab - -Tells the slave thread to restrict replication to commands where -the current database is @code{database_name}. -To specify more than one database, use the directive multiple -times, once for each database. Note that this will not replicate -cross-database queries such as @code{UPDATE some_db.some_table -SET foo='bar'} while having selected a different or no database. If you -need cross database updates to work, make sure you have 3.23.28 or -later, and use @code{replicate-wild-do-table=db_name.%}. - -Example: @code{replicate-do-db=some_db} - -@item @code{log-slave-updates} @tab -Tells the slave to log the updates from the slave thread to the binary -log. Off by default. You will need to turn it on if you plan to -daisy-chain the slaves. - -@item @code{replicate-rewrite-db=from_name->to_name} @tab -Updates to a database with a different name than the original. - -Example: @code{replicate-rewrite-db=master_db_name->slave_db_name} - -@item @code{slave-skip-errors= [err_code1,err_code2,... | all]} @tab - -Available only in 3.23.47 and later. Tells the slave thread to continue -replication when a query returns an error from the provided -list. Normally, replication will discontinue when an error is -encountered, giving the user a chance to resolve the inconsistency in the -data manually. Do not use this option unless you fully understand why -you are getting the errors. If there are no bugs in your -replication setup and client programs, and no bugs in MySQL itself, you -should never get an abort with error. Indiscriminate use of this option -will result in slaves being hopelessly out of sync with the master and -you having no idea how the problem happened. - -For error codes, you should use the numbers provided by the error message in -your slave error log and in the output of @code{SHOW SLAVE STATUS}. Full list -of error messages can be found in the source distribution in -@file{Docs/mysqld_error.txt}. - -You can (but should not) also use a very non-recommended value of @code{all} -which will ignore all error messages and keep barging along regardless. -Needless to say, if you use it, we make no promises regarding your data -integrity. Please do not complain if your data on the slave is not anywhere -close to what it is on the master in this case -- you have been warned. - -Example: - -@code{slave-skip-errors=1062,1053} or @code{slave-skip-errors=all} - -@item @code{skip-slave-start} @tab -Tells the slave server not to start the slave on the startup. The user -can start it later with @code{SLAVE START}. - -@item @code{slave_compressed_protocol=#} @tab -If 1, then use compression on the slave/client protocol if both -slave and master support this. - -@item @code{slave_net_timeout=#} @tab -Number of seconds to wait for more data from the master before aborting -the read. -@end multitable - - -@node Replication SQL, Replication FAQ, Replication Options, Replication -@subsection SQL Commands Related to Replication - -@cindex SQL commands, replication -@cindex commands, replication -@cindex replication, commands - -Replication can be controlled through the SQL interface. Here is the -summary of commands: - -@multitable @columnfractions .45 .55 -@item @strong{Command} @tab @strong{Description} - -@item @code{SLAVE START} - @tab Starts the slave thread. -As of MySQL 4.0.2, you can add @code{IO_THREAD} or @code{SQL_THREAD} -options to the statement to start the I/O thread or the SQL thread. -The I/O thread reads queries from the master server and stores them in the -relay log. The SQL thread reads the relay log and executes the queries. -(Slave) - -@item @code{SLAVE STOP} - @tab Stops the slave thread. Like @code{SLAVE START}, this statement -may be used with @code{IO_THREAD} and @code{SQL_THREAD} options. (Slave) - -@item @code{SET SQL_LOG_BIN=0} -@tab Disables update logging if the user has the @code{SUPER} privilege. - Ignored otherwise. (Master) - -@item @code{SET SQL_LOG_BIN=1} - @tab Re-enables update logging if the user has the @code{SUPER} privilege. - Ignored otherwise. (Master) - -@item @code{SET GLOBAL SQL_SLAVE_SKIP_COUNTER=n} - @tab Skip the next @code{n} events from the master. Only valid when -the slave thread is not running, otherwise, gives an error. Useful for -recovering from replication glitches. - -@item @code{RESET MASTER} - @tab Deletes all binary logs listed in the index file, resetting the binlog -index file to be empty. In pre-3.23.26 versions, use @code{FLUSH MASTER} -(Master) - -@item @code{RESET SLAVE} - @tab Makes the slave forget its replication position in the master -logs. In pre 3.23.26 versions the command was called -@code{FLUSH SLAVE}(Slave) - -@item @code{LOAD TABLE tblname FROM MASTER} - @tab Downloads a copy of the table from master to the slave. Implemented - mainly for debugging of @code{LOAD DATA FROM MASTER}, but some ``gourmet'' - users might find it useful for other things. Do not use it if you consider - yourself the average ``non-hacker'' type user. (Slave) - -@item @code{LOAD DATA FROM MASTER} @tab -Available starting in 4.0.0. Takes a snapshot of the master and copies -it to the slave. Updates the values of @code{MASTER_LOG_FILE} and -@code{MASTER_LOG_POS} so that the slave will start replicating from the -correct position. Will honor table and database exclusion rules -specified with @code{replicate-*} options. So far works only with -@code{MyISAM} tables and acquires a global read lock on the master while -taking the snapshot. In the future it is planned to make it work with -@code{InnoDB} tables and to remove the need for global read lock using -the non-blocking online backup feature. - -@item @code{CHANGE MASTER TO master_def_list} - @tab Changes the master parameters to the values specified in -@code{master_def_list} and restarts the slave thread. @code{master_def_list} -is a comma-separated list of @code{master_def} where @code{master_def} is -one of the following: @code{MASTER_HOST}, @code{MASTER_USER}, -@code{MASTER_PASSWORD}, @code{MASTER_PORT}, @code{MASTER_CONNECT_RETRY}, -@code{MASTER_LOG_FILE}, @code{MASTER_LOG_POS}. For example: - -@example -CHANGE MASTER TO - MASTER_HOST='master2.mycompany.com', - MASTER_USER='replication', - MASTER_PASSWORD='bigs3cret', - MASTER_PORT=3306, - MASTER_LOG_FILE='master2-bin.001', - MASTER_LOG_POS=4; -@end example - -You only need to specify the values that need to be changed. The values that -you omit will stay the same with the exception of when you change the host or -the port. In that case, the slave will assume that since you are connecting to -a different host or a different port, the master is different. Therefore, the -old values of log and position are not applicable anymore, and will -automatically be reset to an empty string and 0, respectively (the start -values). Note that if you restart the slave, it will remember its last master. -If this is not desirable, you should delete the @file{master.info} file before -restarting, and the slave will read its master from @file{my.cnf} or the -command-line. - -This command is useful for setting up a slave when you have the snapshot of -the master and have recorded the log and the offset on the master that the -snapshot corresponds to. You can run - @code{CHANGE MASTER TO MASTER_LOG_FILE='log_name_on_master', - MASTER_LOG_POS=log_offset_on_master} on the slave after restoring the -snapshot. - -(Slave) - -@item @code{SHOW MASTER STATUS} @tab Provides status information on the binlog of the master. (Master) - -@item @code{SHOW SLAVE HOSTS} @tab Available after 4.0.0. Gives a -listing of slaves currently registered with the master (Master) - -@item @code{SHOW SLAVE STATUS} @tab Provides status information on essential parameters of the slave thread. (Slave) - -@item @code{SHOW MASTER LOGS} @tab Only available starting in Version -3.23.28. Lists the binary logs on the master. You should use this -command prior to @code{PURGE MASTER LOGS TO} to find out how far you -should go. (Master) - -@item @code{SHOW BINLOG EVENTS [ IN 'logname' ] [ FROM pos ] - [ LIMIT [offset,] rows ] } @tab -Shows the events in the binary update log. Primarily used for -testing/debugging, but can also be used by regular clients that for some -reason need to read the binary log contents. (Master) - -@item @code{SHOW NEW MASTER FOR SLAVE WITH MASTER_LOG_FILE='logfile' AND - MASTER_LOG_POS=pos AND -MASTER_LOG_SEQ=log_seq AND MASTER_SERVER_ID=server_id} @tab -This command is used when a slave of a possibly dead/unavailable master -needs to be switched to replicate off another slave that has been -replicating the same master. The command will return recalculated -replication coordinates (the slave's current binary log file -name and position within that file). The output can be used in a subsequent -@code{CHANGE MASTER TO} command. Normal users should never need to run -this command. It is primarily reserved for internal use by the fail-safe -replication code. We may later change the syntax if we find a more -intuitive way to describe this operation. - -@item @code{PURGE MASTER LOGS TO 'logname'} - @tab Available starting in Version 3.23.28. Deletes all the -replication logs that are listed in the log -index as being prior to the specified log, and removes them from the -log index, so that the given log now becomes the first. Example: - -@example -PURGE MASTER LOGS TO 'mysql-bin.010' -@end example - -This command will do nothing and fail with an error if you have an -active slave that is currently reading one of the logs you are trying to -delete. However, if you have a dormant slave, and happen to purge one of -the logs it wants to read, the slave will be unable to replicate once it -comes up. The command is safe to run while slaves are replicating -- you -do not need to stop them. - -You must first check all the slaves with @code{SHOW SLAVE STATUS} to -see which log they are on, then do a listing of the logs on the -master with @code{SHOW MASTER LOGS}, find the earliest log among all -the slaves (if all the slaves are up to date, this will be the -last log on the list), backup all the logs you are about to delete -(optional) and purge up to the target log. - -@end multitable - - -@node Replication FAQ, Replication Problems, Replication SQL, Replication -@subsection Replication FAQ - -@strong{Q}: How do I configure a slave if the master is already running -and I do not want to stop it? - -@strong{A}: There are several options. If you have taken a backup of the -master at some point and recorded the binlog name and offset ( from the -output of @code{SHOW MASTER STATUS} ) corresponding to the snapshot, do -the following: - -@itemize @bullet -@item -Make sure unique server id is assigned to the slave. -@item -Execute @code{CHANGE MASTER TO MASTER_HOST='master-host-name', - MASTER_USER='master-user-name', MASTER_PASSWORD='master-pass', - MASTER_LOG_FILE='recorded-log-name', MASTER_LOG_POS=recorded_log_pos} -@item -Execute @code{SLAVE START} -@end itemize - -If you do not have a backup of the master already, here is a quick way to -do it consistently: - -@itemize @bullet -@item -@code{FLUSH TABLES WITH READ LOCK} -@item -@code{gtar zcf /tmp/backup.tar.gz /var/lib/mysql} ( or a variation of this) -@item -@code{SHOW MASTER STATUS} - make sure to record the output - you will need it -later -@item -@code{UNLOCK TABLES} -@end itemize - -Afterwards, follow the instructions for the case when you have a snapshot and -have recorded the log name and offset. You can use the same snapshot to set up -several slaves. As long as the binary logs of the master are left intact, you -can wait as long as several days or in some cases maybe a month to set up a -slave once you have the snapshot of the master. In theory the waiting gap can -be infinite. The two practical limitations is the diskspace of the master -getting filled with old logs, and the amount of time it will take the slave to -catch up. - -In version 4.0.0 and newer, you can also use @code{LOAD DATA FROM -MASTER}. This is a convenient command that will take a snapshot, -restore it to the slave, and adjust the log name and offset on the slave -all at once. In the future, @code{LOAD DATA FROM MASTER} will be the -recommended way to set up a slave. Be warned, howerver, that the read -lock may be held for a long time if you use this command. It is not yet -implemented as efficiently as we would like to have it. If you have -large tables, the preferred method at this time is still with a local -@code{tar} snapshot after executing @code{FLUSH TABLES WITH READ LOCK}. - -@strong{Q}: Does the slave need to be connected to the master all the time? - -@strong{A}: No, it does not. You can have the slave go down or stay -disconnected for hours or even days, then reconnect, catch up on the -updates, and then disconnect or go down for a while again. So you can, -for example, use master-slave setup over a dial-up link that is up only -for short periods of time. The implications of that are that at any -given time the slave is not guaranteed to be in sync with the master -unless you take some special measures. In the future, we will have the -option to block the master until at least one slave is in sync. - -@strong{Q}: How do I force the master to block updates until the slave catches -up? - -@strong{A}: Execute the following commands: - -@itemize @bullet -@item -Master: @code{FLUSH TABLES WITH READ LOCK} -@item -Master: @code{SHOW MASTER STATUS} - record the log name and the offset -@item -Slave: @code{SELECT MASTER_POS_WAIT('recorded_log_name', recorded_log_offset)} -When the select returns, the slave is currently in sync with the master -@item -Master: @code{UNLOCK TABLES} - now the master will continue updates. -@end itemize - -@cindex @code{Binlog_Dump} -@strong{Q}: Why do I sometimes see more than one @code{Binlog_Dump} thread on -the master after I have restarted the slave? - -@strong{A}: @code{Binlog_Dump} is a continuous process that is handled by the -server in the following way: - -@itemize @bullet -@item -Catch up on the updates. -@item -Once there are no more updates left, go into @code{pthread_cond_wait()}, -from which we can be awakened either by an update or a kill. -@item -On wake up, check the reason. If we are not supposed to die, continue -the @code{Binlog_dump} loop. -@item -If there is some fatal error, such as detecting a dead client, -terminate the loop. -@end itemize - -So if the slave thread stops on the slave, the corresponding -@code{Binlog_Dump} thread on the master will not notice it until after -at least one update to the master (or a kill), which is needed to wake -it up from @code{pthread_cond_wait()}. In the meantime, the slave -could have opened another connection, which resulted in another -@code{Binlog_Dump} thread. - -The above problem should not be present in Version 3.23.26 and later -versions. In Version 3.23.26 we added @code{server-id} to each -replication server, and now all the old zombie threads are killed on the -master when a new replication thread connects from the same slave - -@strong{Q}: How do I rotate replication logs? - -@strong{A}: In Version 3.23.28 you should use @code{PURGE MASTER LOGS -TO} command after determining which logs can be deleted, and optionally -backing them up first. In earlier versions the process is much more -painful, and cannot be safely done without stopping all the slaves in -the case that you plan to re-use log names. You will need to stop the -slave threads, edit the binary log index file, delete all the old logs, -restart the master, start slave threads, and then remove the old log files. - - -@strong{Q}: How do I upgrade on a hot replication setup? - -@strong{A}: If you are upgrading pre-3.23.26 versions, you should just -lock the master tables, let the slave catch up, then run @code{FLUSH -MASTER} on the master, and @code{FLUSH SLAVE} on the slave to reset the -logs, then restart new versions of the master and the slave. Note that -the slave can stay down for some time -- since the master is logging -all the updates, the slave will be able to catch up once it is up and -can connect. - -After 3.23.26, we have locked the replication protocol for modifications, so -you can upgrade masters and slave on the fly to a newer 3.23 version and you -can have different versions of MySQL running on the slave and the -master, as long as they are both newer than 3.23.26. - -@cindex replication, two-way -@strong{Q}: What issues should I be aware of when setting up two-way -replication? - -@strong{A}: MySQL replication currently does not support any -locking protocol between master and slave to guarantee the atomicity of -a distributed (cross-server) update. In in other words, it is possible -for client A to make an update to co-master 1, and in the meantime, -before it propagates to co-master 2, client B could make an update to -co-master 2 that will make the update of client A work differently than -it did on co-master 1. Thus when the update of client A will make it -to co-master 2, it will produce tables that will be different from -what you have on co-master 1, even after all the updates from co-master -2 have also propagated. So you should not co-chain two servers in a -two-way replication relationship, unless you are sure that you updates -can safely happen in any order, or unless you take care of mis-ordered -updates somehow in the client code. - - -You must also realise that two-way replication actually does not improve -performance very much, if at all, as far as updates are concerned. Both -servers need to do the same amount of updates each, as you would have -one server do. The only difference is that there will be a little less -lock contention, because the updates originating on another server will -be serialised in one slave thread. This benefit, though, might be -offset by network delays. - -@cindex performance, improving -@cindex increasing, performance -@strong{Q}: How can I use replication to improve performance of my system? - -@strong{A}: You should set up one server as the master, and direct all -writes to it, and configure as many slaves as you have the money and -rackspace for, distributing the reads among the master and the slaves. -You can also start the slaves with @code{--skip-bdb}, -@code{--low-priority-updates} and @code{--delay-key-write=ALL} -to get speed improvements for the slave. In this case the slave will -use non-transactional @code{MyISAM} tables instead of @code{BDB} tables -to get more speed. - -@strong{Q}: What should I do to prepare my client code to use -performance-enhancing replication? - -@strong{A}: -If the part of your code that is responsible for database access has -been properly abstracted/modularised, converting it to run with the -replicated setup should be very smooth and easy -- just change the -implementation of your database access to read from some slave or the -master, and to always write to the master. If your code does not have -this level of abstraction, -setting up a replicated system will give you an opportunity/motivation -to it clean up. - You should start by creating a wrapper library -/module with the following functions: - -@itemize @bullet -@item -@code{safe_writer_connect()} -@item -@code{safe_reader_connect()} -@item -@code{safe_reader_query()} -@item -@code{safe_writer_query()} -@end itemize - -@code{safe_} means that the function will take care of handling all -the error conditions. - -You should then convert your client code to use the wrapper library. -It may be a painful and scary process at first, but it will pay off in -the long run. All applications that follow the above pattern will be -able to take advantage of one-master/many slaves solution. The -code will be a lot easier to maintain, and adding troubleshooting -options will be trivial. You will just need to modify one or two -functions, for example, to log how long each query took, or which -query, among your many thousands, gave you an error. If you have -written a lot of code already, you may want to automate the conversion -task by using Monty's @code{replace} utility, which comes with the -standard distribution of MySQL, or just write your own Perl script. -Hopefully, your code follows some recognisable pattern. If not, then -you are probably better off rewriting it anyway, or at least going -through and manually beating it into a pattern. - -Note that, of course, you can use different names for the -functions. What is important is having unified interface for connecting -for reads, connecting for writes, doing a read, and doing a write. - - -@strong{Q}: When and how much can MySQL replication improve the performance -of my system? - -@strong{A}: MySQL replication is most beneficial for a system -with frequent reads and not so frequent writes. In theory, by using a -one master/many slaves setup you can scale by adding more slaves until -you either run out of network bandwidth, or your update -load grows to the point -that the master cannot handle it. - -In order to determine how many slaves you can get before the added -benefits begin to level out, and how much you can improve performance -of your site, you need to know your query patterns, and empirically - (by benchmarking) determine the relationship between the throughput -on reads (reads per second, or @code{max_reads}) and on writes -@code{max_writes}) on a typical master and a typical slave. The -example here will show you a rather simplified calculation of what you -can get with replication for our imagined system. - -Let's say our system load consists of 10% writes and 90% reads, and we -have determined that @code{max_reads} = 1200 - 2 * @code{max_writes}, -or in other words, our system can do 1200 reads per second with no -writes, our average write is twice as slow as average read, -and the relationship is -linear. Let us suppose that our master and slave are of the same -capacity, and we have N slaves and 1 master. Then we have for each -server (master or slave): - -@code{reads = 1200 - 2 * writes} (from bencmarks) - -@code{reads = 9* writes / (N + 1) } (reads split, but writes go -to all servers) - -@code{9*writes/(N+1) + 2 * writes = 1200} - -@code{writes = 1200/(2 + 9/(N+1)} - -So if N = 0, which means we have no replication, our system can handle -1200/11, about 109 writes per second (which means we will have 9 times -as many reads due to the nature of our application). - -If N = 1, we can get up to 184 writes per second. - -If N = 8, we get up to 400. - -If N = 17, 480 writes. - -Eventually as N approaches infinity (and our budget negative infinity), -we can get very close to 600 writes per second, increasing system -throughput about 5.5 times. However, with only 8 servers, we increased -it almost 4 times already. - -Note that our computations assumed infinite network bandwidth, and -neglected several other factors that could turn out to be significant on -your system. In many cases, you may not be able to make a computation -similar to the one above that will accurately predict what will happen -on your system if you add N replication slaves. However, answering the -following questions should help you decided whether and how much, if at -all, the replication will improve the performance of your system: - -@itemize @bullet -@item -What is the read/write ratio on your system? -@item -How much more write load can one server handle if you reduce the reads? -@item -How many slaves do you have bandwidth for on your network? -@end itemize - -@strong{Q}: How can I use replication to provide redundancy/high -availability? - -@strong{A}: With the currently available features, you would have to -set up a master and a slave (or several slaves), and write a script -that will monitor the -master to see if it is up, and instruct your applications and -the slaves of the master change in case of failure. Some suggestions: - -@itemize @bullet -@item -To tell a slave to change the master use the @code{CHANGE MASTER TO} command. -@item -A good way to keep your applications informed as to the location of the -master is by having a dynamic DNS entry for the master. -With @code{bind} you can use @file{nsupdate} to dynamically update your DNS. -@item -You should run your slaves with the @code{log-bin} option and without -@code{log-slave-updates}. This way the slave will be ready to become a -master as soon as you issue @code{STOP SLAVE}; @code{RESET MASTER}, and -@code{CHANGE MASTER TO} on the other slaves. It will also help you catch -spurious updates that may happen because of misconfiguration of the -slave (ideally, you want to configure access rights so that no client -can update the slave, except for the slave thread) combined with the -bugs in your client programs (they should never update the slave -directly). - -@end itemize - -We are currently working on integrating an automatic master election -system into MySQL, but until it is ready, you will have to -create your own monitoring tools. - - -@node Replication Problems, , Replication FAQ, Replication -@subsection Troubleshooting Replication - -If you have followed the instructions, and your replication setup is not -working, first eliminate the user error factor by checking the following: - -@itemize @bullet -@item -Is the master logging to the binary log? Check with @code{SHOW MASTER STATUS}. -If it is, @code{Position} will be non-zero. If not, verify that you have -given the master @code{log-bin} option and have set @code{server-id}. -@item -Is the slave running? Check with @code{SHOW SLAVE STATUS}. The answer is found -in @code{Slave_running} column. If not, verify slave options and check the -error log for messages. -@item -If the slave is running, did it establish connection with the master? Do -@code{SHOW PROCESSLIST}, find the thread with @code{system user} value in -@code{User} column and @code{none} in the @code{Host} column, and check the -@code{State} column. If it says @code{connecting to master}, verify the -privileges for the replication user on the master, master host name, your -DNS setup, whether the master is actually running, whether it is reachable -from the slave, and if all that seems okay, read the error logs. -@item -If the slave was running, but then stopped, look at SHOW SLAVE STATUS -output and check the error logs. It usually -happens when some query that succeeded on the master fails on the slave. This -should never happen if you have taken a proper snapshot of the master, and -never modify the data on the slave outside of the slave thread. If it does, -it is a bug, read below on how to report it. -@item -If a query on that succeeded on the master refuses to run on the slave, and -a full database resync ( the proper thing to do ) does not seem feasible, -try the following: -@itemize @minus -@item -First see if there is some stray record in the way. Understand how it got -there, then delete it and run @code{SLAVE START} -@item -If the above does not work or does not apply, try to understand if it would -be safe to make the update manually ( if needed) and then ignore the next -query from the master. -@item -If you have decided you can skip the next query, do -@code{SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; SLAVE START;} to skip a query that -does not use @code{AUTO_INCREMENT} or @code{LAST_INSERT_ID()}, or -@code{SET GLOBAL SQL_SLAVE_SKIP_COUNTER=2; SLAVE START;} otherwise. The reason -queries that use @code{AUTO_INCREMENT} or @code{LAST_INSERT_ID()} -are different is that they take two events in the binary log of the master. - -@item -If you are sure the slave started out perfectly in sync with the master, -and no one has updated the tables involved outside of slave thread, -report the bug, so -you will not have to do the above tricks again. -@end itemize -@item -Make sure you are not running into an old bug by upgrading to the most recent -version. -@item -If all else fails, read the error logs. If they are big, -@code{grep -i slave /path/to/your-log.err} on the slave. There is no -generic pattern to search for on the master, as the only errors it logs -are general system errors -- if it can, it will send the error to the slave -when things go wrong. -@end itemize - -When you have determined that there is no user error involved, and replication -still either does not work at all or is unstable, it is time to start working -on a bug report. We need to get as much info as possible from you to be able -to track down the bug. Please do spend some time and effort preparing a good -bug report. Ideally, we would like to have a test case in the format found in -@code{mysql-test/t/rpl*} directory of the source tree. If you submit a test -case like that, you can expect a patch within a day or two in most cases, -although, of course, you mileage may vary depending on a number of factors. - -The second best option is to write a simple program with easily configurable -connection arguments for the master and the slave that will demonstrate -the problem on our systems. You can write one in Perl or in C, depending -on which language you know better. - -If you have one of the above ways to demonstrate the bug, use -@code{mysqlbug} to prepare a bug report and send it to -@email{bugs@@lists.mysql.com}. If you have a phantom -- a problem that -does occur but you cannot duplicate "at will": - -@itemize @bullet -@item -Verify that there is no user error involved. For example, if you update the -slave outside of the slave thread, the data will be out of sync, and you can -have unique key violations on updates, in which case the slave thread will -stop and wait for you to clean up the tables manually to bring them in sync. -@item -Run slave with @code{log-slave-updates} and @code{log-bin} -- this will keep -a log of all updates on the slave. -@item -Save all evidence before resetting the replication. If we have no or only -sketchy information, it would take us a while to track down the problem. The -evidence you should collect is: -@itemize @minus -@item -All binary logs on the master -@item -All binary log on the slave -@item -The output of @code{SHOW MASTER STATUS} on the master at the time -you have discovered the problem -@item -The output of @code{SHOW SLAVE STATUS} on the master at the time -you have discovered the problem -@item -Error logs on the master and on the slave -@end itemize -@item -Use @code{mysqlbinlog} to examine the binary logs. The following should -be helpful -to find the trouble query, for example: -@example -mysqlbinlog -j pos_from_slave_status /path/to/log_from_slave_status | head -@end example -@end itemize - -Once you have collected the evidence on the phantom problem, try hard to -isolate it into a separate test case first. Then report the problem to -@email{bugs@@lists.mysql.com} with as much info as possible. - - - - -@node MySQL Optimisation, Reference, MySQL Database Administration, Top -@chapter MySQL Optimisation - -@menu -* Optimise Overview:: Optimisation Overview -* Query Speed:: Optimising @code{SELECT}s and Other Queries -* Locking Issues:: Locking Issues -* Optimising Database Structure:: Optimising Database Structure -* Optimising the Server:: Optimising the MySQL Server -* Disk issues:: Disk Issues -@end menu - - -Optimisation is a complicated task because it ultimately requires -understanding of the whole system. While it may be possible to do some -local optimisations with small knowledge of your system or application, -the more optimal you want your system to become the more you will have -to know about it. - -This chapter will try to explain and give some examples of different -ways to optimise MySQL. Remember, however, that there are -always some (increasingly harder) additional ways to make the system -even faster. - - -@node Optimise Overview, Query Speed, MySQL Optimisation, MySQL Optimisation -@section Optimisation Overview - -The most important part for getting a system fast is of course the basic -design. You also need to know what kinds of things your system will be -doing, and what your bottlenecks are. - -The most common bottlenecks are: -@itemize @bullet -@item Disk seeks. -It takes time for the disk to find a piece of data. With modern disks in -1999, the mean time for this is usually lower than 10ms, so we can in -theory do about 100 seeks a second. This time improves slowly with new -disks and is very hard to optimise for a single table. The way to -optimise this is to spread the data on more than one disk. - -@item Disk reading/writing. -When the disk is at the correct position we need to read the data. With -modern disks in 1999, one disk delivers something like 10-20MB/s. This -is easier to optimise than seeks because you can read in parallel from -multiple disks. - -@item CPU cycles. -When we have the data in main memory (or if it already were -there) we need to process it to get to our result. Having small -tables compared to the memory is the most common limiting -factor. But then, with small tables speed is usually not the problem. - -@item Memory bandwidth. -When the CPU needs more data than can fit in the CPU cache the main -memory bandwidth becomes a bottleneck. This is an uncommon bottleneck -for most systems, but one should be aware of it. -@end itemize - - -@menu -* Design Limitations:: MySQL Design Limitations/Tradeoffs -* Portability:: Portability -* Internal use:: What Have We Used MySQL For? -* MySQL Benchmarks:: The MySQL Benchmark Suite -* Custom Benchmarks:: Using Your Own Benchmarks -@end menu - - -@node Design Limitations, Portability, Optimise Overview, Optimise Overview -@subsection MySQL Design Limitations/Tradeoffs - -@cindex design, limitations -@cindex limitations, design - -When using the MyISAM table handler, MySQL uses extremely fast table -locking (multiple readers / single writers). The biggest problem with -this table type is a if you have a mix of a steady stream of updates and -slow selects on the same table. If this is a problem with some tables, -you can use another table type for these. @xref{Table types}. - -MySQL can work with both transactional and not transactional tables. To -be able to work smoothly with not transactional tables (which can't -rollback if something goes wrong), MySQL has the following rules: - -@cindex default values -@itemize @bullet -@item -All columns has default values. -@item -If you insert a 'wrong' value in a column like a @code{NULL} in a -@code{NOT NULL} column or a too big numerical value in a numerical -column, MySQL will instead of giving an error instead set the column to -the 'best possible value'. For numerical values this is 0, the smallest -possible values or the largest possible value. For strings this is -either the empty string or the longest possible string that can be in -the column. -@item -All calculated expressions returns a value that can be used instead of -signaling an error condition. For example 1/0 returns @code{NULL} -@end itemize - -The reason for the above rules is that we can't check these conditions -before the query starts to execute. If we encounter a problem after -updating a few rows, we can't just rollback as the table type may not -support this. We can't stop because in that case the update would be -'half done' which is probably the worst possible scenario. In this case -it's better to 'do the best you can' and then continue as if nothing -happened. - -The above means that one should not use MySQL to check fields content, -but one should do this in the application. - -@node Portability, Internal use, Design Limitations, Optimise Overview -@subsection Portability - -@cindex portability -@cindex crash-me program -@cindex programs, crash-me - -Because all SQL servers implement different parts of SQL, it takes work to -write portable SQL applications. For very simple selects/inserts it is -very easy, but the more you need the harder it gets. If you want an -application that is fast with many databases it becomes even harder! - -To make a complex application portable you need to choose a number of -SQL servers that it should work with. - -You can use the MySQL @code{crash-me} program/web-page -@uref{http://www.mysql.com/information/crash-me.php} to find functions, -types, and limits you can use with a selection of database -servers. Crash-me now tests far from everything possible, but it -is still comprehensive with about 450 things tested. - -For example, you shouldn't have column names longer than 18 characters -if you want to be able to use Informix or DB2. - -Both the MySQL benchmarks and @code{crash-me} programs are very -database-independent. By taking a look at how we have handled this, you -can get a feeling for what you have to do to write your application -database-independent. The benchmarks themselves can be found in the -@file{sql-bench} directory in the MySQL source -distribution. They are written in Perl with DBI database interface -(which solves the access part of the problem). - -See @uref{http://www.mysql.com/information/benchmarks.html} for the results -from this benchmark. - -As you can see in these results, all databases have some weak points. That -is, they have different design compromises that lead to different -behaviour. - -If you strive for database independence, you need to get a good feeling -for each SQL server's bottlenecks. MySQL is very fast in -retrieving and updating things, but will have a problem in mixing slow -readers/writers on the same table. Oracle, on the other hand, has a big -problem when you try to access rows that you have recently updated -(until they are flushed to disk). Transaction databases in general are -not very good at generating summary tables from log tables, as in this -case row locking is almost useless. - -To get your application @emph{really} database-independent, you need to define -an easy extendable interface through which you manipulate your data. As -C++ is available on most systems, it makes sense to use a C++ classes -interface to the databases. - -If you use some specific feature for some database (like the -@code{REPLACE} command in MySQL), you should code a method for -the other SQL servers to implement the same feature (but slower). With -MySQL you can use the @code{/*! */} syntax to add -MySQL-specific keywords to a query. The code inside -@code{/**/} will be treated as a comment (ignored) by most other SQL -servers. - -If high performance is more important than exactness, as in some -web applications, it is possibile to create an application layer that -caches all results to give you even higher performance. By letting -old results 'expire' after a while, you can keep the cache reasonably -fresh. This provides a method to handle high load spikes, in which case -you can dynamically increase the cache and set the expire timeout higher -until things get back to normal. - -In this case the table creation information should contain information -of the initial size of the cache and how often the table should normally -be refreshed. - - -@node Internal use, MySQL Benchmarks, Portability, Optimise Overview -@subsection What Have We Used MySQL For? - -@cindex uses, of MySQL -@cindex customers, of MySQL - -During MySQL initial development, the features of MySQL -were made to fit our largest customer. They handle data warehousing for a -couple of the biggest retailers in Sweden. - -From all stores, we get weekly summaries of all bonus card transactions, -and we are expected to provide useful information for the store owners -to help them find how their advertisement campaigns are affecting their -customers. - -The data is quite huge (about 7 million summary transactions per month), -and we have data for 4-10 years that we need to present to the users. -We got weekly requests from the customers that they want to get -'instant' access to new reports from this data. - -We solved this by storing all information per month in compressed -'transaction' tables. We have a set of simple macros (script) that -generates summary tables grouped by different criteria (product group, -customer id, store ...) from the transaction tables. The reports are -web pages that are dynamically generated by a small Perl script that -parses a web page, executes the SQL statements in it, and inserts the -results. We would have used PHP or mod_perl instead but they were -not available at that time. - -For graphical data we wrote a simple tool in @code{C} that can produce -GIFs based on the result of a SQL query (with some processing of the -result). This is also dynamically executed from the Perl script that -parses the @code{HTML} files. - -In most cases a new report can simply be done by copying an existing -script and modifying the SQL query in it. In some cases, we will need to -add more fields to an existing summary table or generate a new one, but -this is also quite simple, as we keep all transactions tables on disk. -(Currently we have at least 50G of transactions tables and 200G of other -customer data.) - -We also let our customers access the summary tables directly with ODBC -so that the advanced users can themselves experiment with the data. - -We haven't had any problems handling this with quite modest Sun Ultra -SPARCstation (2x200 Mhz). We recently upgraded one of our servers to a 2 -CPU 400 Mhz UltraSPARC, and we are now planning to start handling -transactions on the product level, which would mean a ten-fold increase -of data. We think we can keep up with this by just adding more disk to -our systems. - -We are also experimenting with Intel-Linux to be able to get more CPU -power cheaper. Now that we have the binary portable database format (new -in Version 3.23), we will start to use this for some parts of the application. - -Our initial feelings are that Linux will perform much better on -low-to-medium load and Solaris will perform better when you start to get a -high load because of extreme disk IO, but we don't yet have anything -conclusive about this. After some discussion with a Linux Kernel -developer, this might be a side effect of Linux giving so much resources -to the batch job that the interactive performance gets very low. This -makes the machine feel very slow and unresponsive while big batches are -going. Hopefully this will be better handled in future Linux Kernels. - - -@node MySQL Benchmarks, Custom Benchmarks, Internal use, Optimise Overview -@subsection The MySQL Benchmark Suite - -@cindex benchmark suite -@cindex crash-me program - -This should contain a technical description of the MySQL -benchmark suite (and @code{crash-me}), but that description is not -written yet. Currently, you can get a good idea of the benchmark by -looking at the code and results in the @file{sql-bench} directory in any -MySQL source distributions. - -This benchmark suite is meant to be a benchmark that will tell any user -what things a given SQL implementation performs well or poorly at. - -Note that this benchmark is single threaded, so it measures the minimum -time for the operations. We plan to in the future add a lot of -multi-threaded tests to the benchmark suite. - -For example, (run on the same NT 4.0 machine): - -@multitable @columnfractions .35 .10 .10 -@item @strong{Reading 2000000 rows by index} @tab @strong{Seconds} @tab @strong{Seconds} -@item mysql @tab 367 @tab 249 -@item mysql_odbc @tab 464 @tab -@item db2_odbc @tab 1206 @tab -@item informix_odbc @tab 121126 @tab -@item ms-sql_odbc @tab 1634 @tab -@item oracle_odbc @tab 20800 @tab -@item solid_odbc @tab 877 @tab -@item sybase_odbc @tab 17614 @tab -@end multitable - -@multitable @columnfractions .35 .10 .10 -@item @strong{Inserting (350768) rows} @tab @strong{Seconds} @tab @strong{Seconds} -@item mysql @tab 381 @tab 206 -@item mysql_odbc @tab 619 @tab -@item db2_odbc @tab 3460 @tab -@item informix_odbc @tab 2692 @tab -@item ms-sql_odbc @tab 4012 @tab -@item oracle_odbc @tab 11291 @tab -@item solid_odbc @tab 1801 @tab -@item sybase_odbc @tab 4802 @tab -@end multitable - -In the above test MySQL was run with a 8M index cache. - -We have gathered some more benchmark results at -@uref{http://www.mysql.com/information/benchmarks.html}. - -Note that Oracle is not included because they asked to be removed. All -Oracle benchmarks have to be passed by Oracle! We believe that makes -Oracle benchmarks @strong{very} biased because the above benchmarks are -supposed to show what a standard installation can do for a single -client. - -To run the benchmark suite, you have to download a MySQL source -distribution, install the perl DBI driver, the perl DBD driver for the -database you want to test and then do: - -@example -cd sql-bench -perl run-all-tests --server=# -@end example - -where # is one of supported servers. You can get a list of all options -and supported servers by doing @code{run-all-tests --help}. - -@cindex crash-me -@code{crash-me} tries to determine what features a database supports and -what its capabilities and limitations are by actually running -queries. For example, it determines: - -@itemize @bullet -@item -What column types are supported -@item -How many indexes are supported -@item -What functions are supported -@item -How big a query can be -@item -How big a @code{VARCHAR} column can be -@end itemize - -We can find the result from @code{crash-me} on a lot of different databases at -@uref{http://www.mysql.com/information/crash-me.php}. - - -@node Custom Benchmarks, , MySQL Benchmarks, Optimise Overview -@subsection Using Your Own Benchmarks - -@cindex benchmarks -@cindex performance, benchmarks - -You should definitely benchmark your application and database to find -out where the bottlenecks are. By fixing it (or by replacing the -bottleneck with a 'dummy module') you can then easily identify the next -bottleneck (and so on). Even if the overall performance for your -application is sufficient, you should at least make a plan for each -bottleneck, and decide how to solve it if someday you really need the -extra performance. - -For an example of portable benchmark programs, look at the MySQL -benchmark suite. @xref{MySQL Benchmarks, , MySQL Benchmarks}. You -can take any program from this suite and modify it for your needs. By doing -this, you can try different solutions to your problem and test which is really -the fastest solution for you. - -It is very common that some problems only occur when the system is very -heavily loaded. We have had many customers who contact us when they -have a (tested) system in production and have encountered load problems. In -every one of these cases so far, it has been problems with basic design -(table scans are @strong{not good} at high load) or OS/Library issues. Most of -this would be a @strong{lot} easier to fix if the systems were not -already in production. - -To avoid problems like this, you should put some effort into benchmarking -your whole application under the worst possible load! You can use -Super Smack for this, and it is available at: -@uref{http://www.mysql.com/Downloads/super-smack/super-smack-1.0.tar.gz}. -As the name suggests, it can bring your system down to its knees if you ask it, -so make sure to use it only on your development systems. - - -@node Query Speed, Locking Issues, Optimise Overview, MySQL Optimisation -@section Optimising @code{SELECT}s and Other Queries - -@cindex queries, speed of -@cindex permission checks, effect on speed -@cindex speed, of queries - -First, one thing that affects all queries: The more complex permission -system setup you have, the more overhead you get. - -If you do not have any @code{GRANT} statements done, MySQL will -optimise the permission checking somewhat. So if you have a very high -volume it may be worth the time to avoid grants. Otherwise, more -permission check results in a larger overhead. - -If your problem is with some explicit MySQL function, you can -always time this in the MySQL client: - -@example -mysql> SELECT BENCHMARK(1000000,1+1); -+------------------------+ -| BENCHMARK(1000000,1+1) | -+------------------------+ -| 0 | -+------------------------+ -1 row in set (0.32 sec) -@end example - -The above shows that MySQL can execute 1,000,000 @code{+} -expressions in 0.32 seconds on a @code{PentiumII 400MHz}. - -All MySQL functions should be very optimised, but there may be -some exceptions, and the @code{BENCHMARK(loop_count,expression)} is a -great tool to find out if this is a problem with your query. - -@menu -* EXPLAIN:: @code{EXPLAIN} Syntax (Get Information About a @code{SELECT}) -* Estimating performance:: Estimating query performance -* SELECT speed:: Speed of @code{SELECT} queries -* Where optimisations:: How MySQL optimises @code{WHERE} clauses -* DISTINCT optimisation:: How MySQL Optimises @code{DISTINCT} -* LEFT JOIN optimisation:: How MySQL optimises @code{LEFT JOIN} -* ORDER BY optimisation:: How MySQL Optimises @code{ORDER BY} -* LIMIT optimisation:: How MySQL optimises @code{LIMIT} -* Insert speed:: Speed of @code{INSERT} queries -* Update speed:: Speed of @code{UPDATE} queries -* Delete speed:: Speed of @code{DELETE} queries -* Tips:: Other Optimisation Tips -@end menu - - -@node EXPLAIN, Estimating performance, Query Speed, Query Speed -@subsection @code{EXPLAIN} Syntax (Get Information About a @code{SELECT}) - -@findex EXPLAIN -@findex SELECT, optimising - -@example - EXPLAIN tbl_name -or EXPLAIN SELECT select_options -@end example - -@code{EXPLAIN tbl_name} is a synonym for @code{DESCRIBE tbl_name} or -@code{SHOW COLUMNS FROM tbl_name}. - -When you precede a @code{SELECT} statement with the keyword @code{EXPLAIN}, -MySQL explains how it would process the @code{SELECT}, providing -information about how tables are joined and in which order. - -With the help of @code{EXPLAIN}, you can see when you must add indexes -to tables to get a faster @code{SELECT} that uses indexes to find the -records. You can also see if the optimiser joins the tables in an optimal -order. To force the optimiser to use a specific join order for a -@code{SELECT} statement, add a @code{STRAIGHT_JOIN} clause. - -For non-simple joins, @code{EXPLAIN} returns a row of information for each -table used in the @code{SELECT} statement. The tables are listed in the order -they would be read. MySQL resolves all joins using a single-sweep -multi-join method. This means that MySQL reads a row from the first -table, then finds a matching row in the second table, then in the third table -and so on. When all tables are processed, it outputs the selected columns and -backtracks through the table list until a table is found for which there are -more matching rows. The next row is read from this table and the process -continues with the next table. - -Output from @code{EXPLAIN} includes the following columns: - -@table @code -@item table -The table to which the row of output refers. - -@item type -The join type. Information about the various types is given below. - -@item possible_keys -The @code{possible_keys} column indicates which indexes MySQL -could use to find the rows in this table. Note that this column is -totally independent of the order of the tables. That means that some of -the keys in possible_keys may not be usable in practice with the -generated table order. - -If this column is empty, there are no relevant indexes. In this case, -you may be able to improve the performance of your query by examining -the @code{WHERE} clause to see if it refers to some column or columns -that would be suitable for indexing. If so, create an appropriate index -and check the query with @code{EXPLAIN} again. @xref{ALTER TABLE}. - -To see what indexes a table has, use @code{SHOW INDEX FROM tbl_name}. - -@item key -The @code{key} column indicates the key (index) that MySQL actually -decided to use. The key is @code{NULL} if no index was chosen. To force -MySQL to use an key listed in the @code{possible_keys} column, use -@code{USE KEY/IGNORE KEY} in your query. -@xref{SELECT}. - -Also, running @code{myisamchk --analyze} (@pxref{myisamchk syntax}) or -@code{ANALYZE TABLE} (@pxref{ANALYZE TABLE}) on the table will help the -optimiser choose better indexes. - -@item key_len -The @code{key_len} column indicates the length of the key that -MySQL decided to use. The length is @code{NULL} if the -@code{key} is @code{NULL}. Note that this tells us how many parts of a -multi-part key MySQL will actually use. - -@item ref -The @code{ref} column shows which columns or constants are used with the -@code{key} to select rows from the table. - -@item rows -The @code{rows} column indicates the number of rows MySQL -believes it must examine to execute the query. - -@item Extra -This column contains additional information of how MySQL will -resolve the query. Here is an explanation of the different text -strings that can be found in this column: - -@table @code -@item Distinct -MySQL will not continue searching for more rows for the current row -combination after it has found the first matching row. - -@item Not exists -MySQL was able to do a @code{LEFT JOIN} optimisation on the -query and will not examine more rows in this table for the previous row -combination after it finds one row that matches the @code{LEFT JOIN} criteria. - -Here is an example for this: - -@example -SELECT * FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.id IS NULL; -@end example - -Assume that @code{t2.id} is defined with @code{NOT NULL}. In this case -MySQL will scan @code{t1} and look up the rows in @code{t2} -through @code{t1.id}. If MySQL finds a matching row in -@code{t2}, it knows that @code{t2.id} can never be @code{NULL}, and will -not scan through the rest of the rows in @code{t2} that has the same -@code{id}. In other words, for each row in @code{t1}, MySQL -only needs to do a single lookup in @code{t2}, independent of how many -matching rows there are in @code{t2}. - -@item @code{range checked for each record (index map: #)} -MySQL didn't find a real good index to use. It will, instead, for -each row combination in the preceding tables, do a check on which index to -use (if any), and use this index to retrieve the rows from the table. This -isn't very fast but is faster than having to do a join without -an index. - -@item Using filesort -MySQL will need to do an extra pass to find out how to retrieve -the rows in sorted order. The sort is done by going through all rows -according to the @code{join type} and storing the sort key + pointer to -the row for all rows that match the @code{WHERE}. Then the keys are -sorted. Finally the rows are retrieved in sorted order. - -@item Using index -The column information is retrieved from the table using only -information in the index tree without having to do an additional seek to -read the actual row. This can be done when all the used columns for -the table are part of the same index. - -@item Using temporary -To resolve the query MySQL will need to create a -temporary table to hold the result. This typically happens if you do an -@code{ORDER BY} on a different column set than you did a @code{GROUP -BY} on. - -@item Using where (was @code{where used}) -A @code{WHERE} clause will be used to restrict which rows will be -matched against the next table or sent to the client. If you don't have -this information and the table is of type @code{ALL} or @code{index}, -you may have something wrong in your query (if you don't intend to -fetch/examine all rows from the table). -@end table - -If you want to get your queries as fast as possible, you should look out for -@code{Using filesort} and @code{Using temporary}. -@end table - -The different join types are listed here, ordered from best to worst type: - -@cindex system table -@cindex tables, system -@table @code -@item system -The table has only one row (= system table). This is a special case of -the @code{const} join type. - -@cindex constant table -@cindex tables, constant -@item const -The table has at most one matching row, which will be read at the start -of the query. Because there is only one row, values from the column in -this row can be regarded as constants by the rest of the -optimiser. @code{const} tables are very fast as they are read only once! - -@item eq_ref -One row will be read from this table for each combination of rows from -the previous tables. This is the best possible join type, other than the -@code{const} types. It is used when all parts of an index are used by -the join and the index is @code{UNIQUE} or a @code{PRIMARY KEY}. - -@item ref -All rows with matching index values will be read from this table for each -combination of rows from the previous tables. @code{ref} is used if the join -uses only a leftmost prefix of the key, or if the key is not @code{UNIQUE} -or a @code{PRIMARY KEY} (in other words, if the join cannot select a single -row based on the key value). If the key that is used matches only a few rows, -this join type is good. - -@item range -Only rows that are in a given range will be retrieved, using an index to -select the rows. The @code{key} column indicates which index is used. -The @code{key_len} contains the longest key part that was used. -The @code{ref} column will be @code{NULL} for this type. - -@item index -This is the same as @code{ALL}, except that only the index tree is -scanned. This is usually faster than @code{ALL}, as the index file is usually -smaller than the datafile. - -@item ALL -A full table scan will be done for each combination of rows from the -previous tables. This is normally not good if the table is the first -table not marked @code{const}, and usually @strong{very} bad in all other -cases. You normally can avoid @code{ALL} by adding more indexes, so that -the row can be retrieved based on constant values or column values from -earlier tables. -@end table - -You can get a good indication of how good a join is by multiplying all values -in the @code{rows} column of the @code{EXPLAIN} output. This should tell you -roughly how many rows MySQL must examine to execute the query. This -number is also used when you restrict queries with the @code{max_join_size} -variable. -@xref{Server parameters}. - -The following example shows how a @code{JOIN} can be optimised progressively -using the information provided by @code{EXPLAIN}. - -Suppose you have the @code{SELECT} statement shown here, that you examine -using @code{EXPLAIN}: - -@example -EXPLAIN SELECT tt.TicketNumber, tt.TimeIn, - tt.ProjectReference, tt.EstimatedShipDate, - tt.ActualShipDate, tt.ClientID, - tt.ServiceCodes, tt.RepetitiveID, - tt.CurrentProcess, tt.CurrentDPPerson, - tt.RecordVolume, tt.DPPrinted, et.COUNTRY, - et_1.COUNTRY, do.CUSTNAME - FROM tt, et, et AS et_1, do - WHERE tt.SubmitTime IS NULL - AND tt.ActualPC = et.EMPLOYID - AND tt.AssignedPC = et_1.EMPLOYID - AND tt.ClientID = do.CUSTNMBR; -@end example - -For this example, assume that: - -@itemize @bullet -@item -The columns being compared have been declared as follows: - -@multitable @columnfractions .10 .15 .15 -@item @strong{Table} @tab @strong{Column} @tab @strong{Column type} -@item @code{tt} @tab @code{ActualPC} @tab @code{CHAR(10)} -@item @code{tt} @tab @code{AssignedPC} @tab @code{CHAR(10)} -@item @code{tt} @tab @code{ClientID} @tab @code{CHAR(10)} -@item @code{et} @tab @code{EMPLOYID} @tab @code{CHAR(15)} -@item @code{do} @tab @code{CUSTNMBR} @tab @code{CHAR(15)} -@end multitable - -@item -The tables have the indexes shown here: - -@multitable @columnfractions .10 .30 -@item @strong{Table} @tab @strong{Index} -@item @code{tt} @tab @code{ActualPC} -@item @code{tt} @tab @code{AssignedPC} -@item @code{tt} @tab @code{ClientID} -@item @code{et} @tab @code{EMPLOYID} (primary key) -@item @code{do} @tab @code{CUSTNMBR} (primary key) -@end multitable - -@item -The @code{tt.ActualPC} values aren't evenly distributed. -@end itemize - -Initially, before any optimisations have been performed, the @code{EXPLAIN} -statement produces the following information: - -@example -table type possible_keys key key_len ref rows Extra -et ALL PRIMARY NULL NULL NULL 74 -do ALL PRIMARY NULL NULL NULL 2135 -et_1 ALL PRIMARY NULL NULL NULL 74 -tt ALL AssignedPC,ClientID,ActualPC NULL NULL NULL 3872 - range checked for each record (key map: 35) -@end example - -Because @code{type} is @code{ALL} for each table, this output indicates that -MySQL is doing a full join for all tables! This will take quite a -long time, as the product of the number of rows in each table must be -examined! For the case at hand, this is @code{74 * 2135 * 74 * 3872 = -45,268,558,720} rows. If the tables were bigger, you can only imagine how -long it would take. - -One problem here is that MySQL can't (yet) use indexes on columns -efficiently if they are declared differently. In this context, -@code{VARCHAR} and @code{CHAR} are the same unless they are declared as -different lengths. Because @code{tt.ActualPC} is declared as @code{CHAR(10)} -and @code{et.EMPLOYID} is declared as @code{CHAR(15)}, there is a length -mismatch. - -To fix this disparity between column lengths, use @code{ALTER TABLE} to -lengthen @code{ActualPC} from 10 characters to 15 characters: - -@example -mysql> ALTER TABLE tt MODIFY ActualPC VARCHAR(15); -@end example - -Now @code{tt.ActualPC} and @code{et.EMPLOYID} are both @code{VARCHAR(15)}. -Executing the @code{EXPLAIN} statement again produces this result: - -@example -table type possible_keys key key_len ref rows Extra -tt ALL AssignedPC,ClientID,ActualPC NULL NULL NULL 3872 Using where -do ALL PRIMARY NULL NULL NULL 2135 - range checked for each record (key map: 1) -et_1 ALL PRIMARY NULL NULL NULL 74 - range checked for each record (key map: 1) -et eq_ref PRIMARY PRIMARY 15 tt.ActualPC 1 -@end example - -This is not perfect, but is much better (the product of the @code{rows} -values is now less by a factor of 74). This version is executed in a couple -of seconds. - -A second alteration can be made to eliminate the column length mismatches -for the @code{tt.AssignedPC = et_1.EMPLOYID} and @code{tt.ClientID = -do.CUSTNMBR} comparisons: - -@example -mysql> ALTER TABLE tt MODIFY AssignedPC VARCHAR(15), - -> MODIFY ClientID VARCHAR(15); -@end example - -Now @code{EXPLAIN} produces the output shown here: - -@example -table type possible_keys key key_len ref rows Extra -et ALL PRIMARY NULL NULL NULL 74 -tt ref AssignedPC, ActualPC 15 et.EMPLOYID 52 Using where - ClientID, - ActualPC -et_1 eq_ref PRIMARY PRIMARY 15 tt.AssignedPC 1 -do eq_ref PRIMARY PRIMARY 15 tt.ClientID 1 -@end example - -This is almost as good as it can get. - -The remaining problem is that, by default, MySQL assumes that values -in the @code{tt.ActualPC} column are evenly distributed, and that isn't the -case for the @code{tt} table. Fortunately, it is easy to tell MySQL -about this: - -@example -shell> myisamchk --analyze PATH_TO_MYSQL_DATABASE/tt -shell> mysqladmin refresh -@end example - -Now the join is perfect, and @code{EXPLAIN} produces this result: - -@example -table type possible_keys key key_len ref rows Extra -tt ALL AssignedPC NULL NULL NULL 3872 Using where - ClientID, - ActualPC -et eq_ref PRIMARY PRIMARY 15 tt.ActualPC 1 -et_1 eq_ref PRIMARY PRIMARY 15 tt.AssignedPC 1 -do eq_ref PRIMARY PRIMARY 15 tt.ClientID 1 -@end example - -Note that the @code{rows} column in the output from @code{EXPLAIN} is an -educated guess from the MySQL join optimiser. To optimise a -query, you should check if the numbers are even close to the truth. If not, -you may get better performance by using @code{STRAIGHT_JOIN} in your -@code{SELECT} statement and trying to list the tables in a different order in -the @code{FROM} clause. - - -@node Estimating performance, SELECT speed, EXPLAIN, Query Speed -@subsection Estimating Query Performance - -@cindex estimating, query performance -@cindex queries, estimating performance -@cindex performance, estimating - -In most cases you can estimate the performance by counting disk seeks. -For small tables, you can usually find the row in 1 disk seek (as the -index is probably cached). For bigger tables, you can estimate that -(using B++ tree indexes) you will need: @code{log(row_count) / -log(index_block_length / 3 * 2 / (index_length + data_pointer_length)) + -1} seeks to find a row. - -In MySQL an index block is usually 1024 bytes and the data -pointer is usually 4 bytes. A 500,000 row table with an -index length of 3 (medium integer) gives you: -@code{log(500,000)/log(1024/3*2/(3+4)) + 1} = 4 seeks. - -As the above index would require about 500,000 * 7 * 3/2 = 5.2M, -(assuming that the index buffers are filled to 2/3, which is typical) -you will probably have much of the index in memory and you will probably -only need 1-2 calls to read data from the OS to find the row. - -For writes, however, you will need 4 seek requests (as above) to find -where to place the new index and normally 2 seeks to update the index -and write the row. - -Note that the above doesn't mean that your application will slowly -degenerate by log N! As long as everything is cached by the OS or SQL -server things will only go marginally slower while the table gets -bigger. After the data gets too big to be cached, things will start to -go much slower until your applications is only bound by disk-seeks -(which increase by log N). To avoid this, increase the index cache as -the data grows. @xref{Server parameters}. - - -@node SELECT speed, Where optimisations, Estimating performance, Query Speed -@subsection Speed of @code{SELECT} Queries - -@findex SELECT speed - -@cindex speed, of queries - -In general, when you want to make a slow @code{SELECT ... WHERE} faster, the -first thing to check is whether you can add an index. @xref{MySQL -indexes, , MySQL indexes}. All references between different tables -should usually be done with indexes. You can use the @code{EXPLAIN} command -to determine which indexes are used for a @code{SELECT}. -@xref{EXPLAIN, , @code{EXPLAIN}}. - -Some general tips: - -@itemize @bullet -@item -To help MySQL optimise queries better, run @code{myisamchk ---analyze} on a table after it has been loaded with relevant data. This -updates a value for each index part that indicates the average number of -rows that have the same value. (For unique indexes, this is always 1, -of course.) MySQL will use this to decide which index to -choose when you connect two tables with 'a non-constant expression'. -You can check the result from the @code{analyze} run by doing @code{SHOW -INDEX FROM table_name} and examining the @code{Cardinality} column. - -@item -To sort an index and data according to an index, use @code{myisamchk ---sort-index --sort-records=1} (if you want to sort on index 1). If you -have a unique index from which you want to read all records in order -according to that index, this is a good way to make that faster. Note, -however, that this sorting isn't written optimally and will take a long -time for a large table! -@end itemize - - -@node Where optimisations, DISTINCT optimisation, SELECT speed, Query Speed -@subsection How MySQL Optimises @code{WHERE} Clauses - -@findex WHERE - -@cindex optimisations - -The @code{WHERE} optimisations are put in the @code{SELECT} part here because -they are mostly used with @code{SELECT}, but the same optimisations apply for -@code{WHERE} in @code{DELETE} and @code{UPDATE} statements. - -Also note that this section is incomplete. MySQL does many -optimisations, and we have not had time to document them all. - -Some of the optimisations performed by MySQL are listed here: - -@itemize @bullet -@item -Removal of unnecessary parentheses: -@example - ((a AND b) AND c OR (((a AND b) AND (c AND d)))) --> (a AND b AND c) OR (a AND b AND c AND d) -@end example -@item -Constant folding: -@example - (a<b AND b=c) AND a=5 --> b>5 AND b=c AND a=5 -@end example -@item -Constant condition removal (needed because of constant folding): -@example - (B>=5 AND B=5) OR (B=6 AND 5=5) OR (B=7 AND 5=6) --> B=5 OR B=6 -@end example -@item -Constant expressions used by indexes are evaluated only once. -@item -@code{COUNT(*)} on a single table without a @code{WHERE} is retrieved -directly from the table information for @code{MyISAM} and @code{HEAP} tables. -This is also done for any @code{NOT NULL} expression when used with only one -table. -@item -Early detection of invalid constant expressions. MySQL quickly -detects that some @code{SELECT} statements are impossible and returns no rows. -@item -@code{HAVING} is merged with @code{WHERE} if you don't use @code{GROUP BY} -or group functions (@code{COUNT()}, @code{MIN()}...). -@item -For each sub-join, a simpler @code{WHERE} is constructed to get a fast -@code{WHERE} evaluation for each sub-join and also to skip records as -soon as possible. -@cindex constant table -@cindex tables, constant -@item -All constant tables are read first, before any other tables in the query. -A constant table is: -@itemize @minus -@item -An empty table or a table with 1 row. -@item -A table that is used with a @code{WHERE} clause on a @code{UNIQUE} -index, or a @code{PRIMARY KEY}, where all index parts are used with constant -expressions and the index parts are defined as @code{NOT NULL}. -@end itemize -All the following tables are used as constant tables: -@example -mysql> SELECT * FROM t WHERE primary_key=1; -mysql> SELECT * FROM t1,t2 - -> WHERE t1.primary_key=1 AND t2.primary_key=t1.id; -@end example - -@item -The best join combination to join the tables is found by trying all -possibilities. If all columns in @code{ORDER BY} and in @code{GROUP -BY} come from the same table, then this table is preferred first when -joining. -@item -If there is an @code{ORDER BY} clause and a different @code{GROUP BY} -clause, or if the @code{ORDER BY} or @code{GROUP BY} contains columns -from tables other than the first table in the join queue, a temporary -table is created. -@item -If you use @code{SQL_SMALL_RESULT}, MySQL will use an in-memory -temporary table. -@item -Each table index is queried, and the best index that spans fewer than 30% of -the rows is used. If no such index can be found, a quick table scan is used. -@item -In some cases, MySQL can read rows from the index without even -consulting the datafile. If all columns used from the index are numeric, -then only the index tree is used to resolve the query. -@item -Before each record is output, those that do not match the @code{HAVING} clause -are skipped. -@end itemize - -Some examples of queries that are very fast: - -@example -mysql> SELECT COUNT(*) FROM tbl_name; -mysql> SELECT MIN(key_part1),MAX(key_part1) FROM tbl_name; -mysql> SELECT MAX(key_part2) FROM tbl_name - -> WHERE key_part_1=constant; -mysql> SELECT ... FROM tbl_name - -> ORDER BY key_part1,key_part2,... LIMIT 10; -mysql> SELECT ... FROM tbl_name - -> ORDER BY key_part1 DESC,key_part2 DESC,... LIMIT 10; -@end example - -The following queries are resolved using only the index tree (assuming -the indexed columns are numeric): - -@example -mysql> SELECT key_part1,key_part2 FROM tbl_name WHERE key_part1=val; -mysql> SELECT COUNT(*) FROM tbl_name - -> WHERE key_part1=val1 AND key_part2=val2; -mysql> SELECT key_part2 FROM tbl_name GROUP BY key_part1; -@end example - -The following queries use indexing to retrieve the rows in sorted -order without a separate sorting pass: - -@example -mysql> SELECT ... FROM tbl_name - -> ORDER BY key_part1,key_part2,... ; -mysql> SELECT ... FROM tbl_name - -> ORDER BY key_part1 DESC,key_part2 DESC,... ; -@end example - - -@node DISTINCT optimisation, LEFT JOIN optimisation, Where optimisations, Query Speed -@subsection How MySQL Optimises @code{DISTINCT} - -@findex DISTINCT - -@cindex optimising, DISTINCT - -@code{DISTINCT} is converted to a @code{GROUP BY} on all columns, -@code{DISTINCT} combined with @code{ORDER BY} will in many cases also -need a temporary table. - -When combining @code{LIMIT #} with @code{DISTINCT}, MySQL will stop -as soon as it finds @code{#} unique rows. - -If you don't use columns from all used tables, MySQL will stop -the scanning of the not used tables as soon as it has found the first match. - -@example -SELECT DISTINCT t1.a FROM t1,t2 where t1.a=t2.a; -@end example - -In the case, assuming @code{t1} is used before @code{t2} (check with -@code{EXPLAIN}), then MySQL will stop reading from @code{t2} (for that -particular row in @code{t1}) when the first row in @code{t2} is found. - - -@node LEFT JOIN optimisation, ORDER BY optimisation, DISTINCT optimisation, Query Speed -@subsection How MySQL Optimises @code{LEFT JOIN} and @code{RIGHT JOIN} - -@findex LEFT JOIN - -@cindex optimising, LEFT JOIN - -@code{A LEFT JOIN B} in MySQL is implemented as follows: - -@itemize @bullet -@item -The table @code{B} is set to be dependent on table @code{A} and all tables -that @code{A} is dependent on. - -@item -The table @code{A} is set to be dependent on all tables (except @code{B}) -that are used in the @code{LEFT JOIN} condition. - -@item -All @code{LEFT JOIN} conditions are moved to the @code{WHERE} clause. - -@item -All standard join optimisations are done, with the exception that a table is -always read after all tables it is dependent on. If there is a circular -dependence then MySQL will issue an error. - -@item -All standard @code{WHERE} optimisations are done. - -@item -If there is a row in @code{A} that matches the @code{WHERE} clause, but there -wasn't any row in @code{B} that matched the @code{LEFT JOIN} condition, -then an extra @code{B} row is generated with all columns set to @code{NULL}. - -@item -If you use @code{LEFT JOIN} to find rows that don't exist in some -table and you have the following test: @code{column_name IS NULL} in the -@code{WHERE} part, where column_name is a column that is declared as -@code{NOT NULL}, then MySQL will stop searching after more rows -(for a particular key combination) after it has found one row that -matches the @code{LEFT JOIN} condition. -@end itemize - -@code{RIGHT JOIN} is implemented analogously as @code{LEFT JOIN}. - -The table read order forced by @code{LEFT JOIN} and @code{STRAIGHT JOIN} -will help the join optimiser (which calculates in which order tables -should be joined) to do its work much more quickly, as there are fewer -table permutations to check. - -Note that the above means that if you do a query of type: - -@example -SELECT * FROM a,b LEFT JOIN c ON (c.key=a.key) LEFT JOIN d (d.key=a.key) - WHERE b.key=d.key -@end example - -MySQL will do a full scan on @code{b} as the @code{LEFT JOIN} will force -it to be read before @code{d}. - -The fix in this case is to change the query to: - -@example -SELECT * FROM b,a LEFT JOIN c ON (c.key=a.key) LEFT JOIN d (d.key=a.key) - WHERE b.key=d.key -@end example - - -@node ORDER BY optimisation, LIMIT optimisation, LEFT JOIN optimisation, Query Speed -@subsection How MySQL Optimises @code{ORDER BY} - -In some cases MySQL can uses index to satisfy an @code{ORDER BY} or -@code{GROUP BY} request without doing any extra sorting. - -The index can also be used even if the @code{ORDER BY} doesn't match the -index exactly, as long as all the unused index parts and all the extra -are @code{ORDER BY} columns are constants in the @code{WHERE} -clause. The following queries will use the index to resolve the -@code{ORDER BY} / @code{GROUP BY} part: - -@example -SELECT * FROM t1 ORDER BY key_part1,key_part2,... -SELECT * FROM t1 WHERE key_part1=constant ORDER BY key_part2 -SELECT * FROM t1 WHERE key_part1=constant GROUP BY key_part2 -SELECT * FROM t1 ORDER BY key_part1 DESC,key_part2 DESC -SELECT * FROM t1 WHERE key_part1=1 ORDER BY key_part1 DESC,key_part2 DESC -@end example - -Some cases where MySQL can @strong{not} use indexes to resolve the @code{ORDER -BY}: (Note that MySQL will still use indexes to find the rows that -matches the @code{WHERE} clause): - -@itemize @bullet -@item -You are doing an @code{ORDER BY} on different keys: - -@code{SELECT * FROM t1 ORDER BY key1,key2} -@item -You are doing an @code{ORDER BY} using non-consecutive key parts. - -@code{SELECT * FROM t1 WHERE key2=constant ORDER BY key_part2} - -@item -You are mixing @code{ASC} and @code{DESC}. - -@code{SELECT * FROM t1 ORDER BY key_part1 DESC,key_part2 ASC} - -@item -The key used to fetch the rows are not the same one that is used to -do the @code{ORDER BY}: - -@code{SELECT * FROM t1 WHERE key2=constant ORDER BY key1} - -@item -You are joining many tables and the columns you are doing an @code{ORDER -BY} on are not all from the first not-@code{const} table that is used to -retrieve rows (This is the first table in the @code{EXPLAIN} output which -doesn't use a @code{const} row fetch method). - -@item -You have different @code{ORDER BY} and @code{GROUP BY} expressions. - -@item -The used table index is an index type that doesn't store rows in order. -(Like the @code{HASH} index in @code{HEAP} tables). - -@item -The index colum may contain @code{NULL} values and one is using -@code{ORDER BY ... DESC}. This is because in SQL @code{NULL} values is -always sorted before normal values, independent of you are using -@code{DESC} or not. -@end itemize - - -In the cases where MySQL have to sort the result, it uses the following -algorithm: - -@itemize @bullet -@item -Read all rows according to key or by table scanning. -Rows that don't match the @code{WHERE} clause are skipped. -@item -Store the sort-key in a buffer (of size @code{sort_buffer}). -@item -When the buffer gets full, run a qsort on it and store the result -in a temporary file. Save a pointer to the sorted block. -(In the case where all rows fits into the sort buffer, no temporary -file is created) -@item -Repeat the above until all rows have been read. -@item -Do a multi-merge of up to @code{MERGEBUFF} (7) regions to one block in -another temporary file. Repeat until all blocks from the first file -are in the second file. -@item -Repeat the following until there is less than @code{MERGEBUFF2} (15) -blocks left. -@item -On the last multi-merge, only the pointer to the row (last part of -the sort-key) is written to a result file. -@item -Now the code in @file{sql/records.cc} will be used to read through them -in sorted order by using the row pointers in the result file. To -optimise this, we read in a big block of row pointers, sort these and -then we read the rows in the sorted order into a row buffer -(@code{record_rnd_buffer}) . -@end itemize - -You can with @code{EXPLAIN SELECT ... ORDER BY} check if MySQL can use -indexes to resolve the query. If you get @code{Using filesort} in the -@code{extra} column, then MySQL can't use indexes to resolve the -@code{ORDER BY}. @xref{EXPLAIN}. - -If you want to have a higher @code{ORDER BY} speed, you should first -see if you can get MySQL to use indexes instead of having to do an extra -sorting phase. If this is not possible, then you can do: - -@itemize @bullet -@item -Increase the size of the @code{sort_buffer} variable. -@item -Increase the size of the @code{record_rnd_buffer} variable. -@item -Change @code{tmpdir} to point to a dedicated disk with lots of empty space. -@end itemize - -@node LIMIT optimisation, Insert speed, ORDER BY optimisation, Query Speed -@subsection How MySQL Optimises @code{LIMIT} - -@findex LIMIT - -@cindex optimising, LIMIT - -In some cases MySQL will handle the query differently when you are -using @code{LIMIT #} and not using @code{HAVING}: - -@itemize @bullet -@item -If you are selecting only a few rows with @code{LIMIT}, MySQL -will use indexes in some cases when it normally would prefer to do a -full table scan. -@item -If you use @code{LIMIT #} with @code{ORDER BY}, MySQL will end the -sorting as soon as it has found the first @code{#} lines instead of sorting -the whole table. -@item -When combining @code{LIMIT #} with @code{DISTINCT}, MySQL will stop -as soon as it finds @code{#} unique rows. -@item -In some cases a @code{GROUP BY} can be resolved by reading the key in order -(or do a sort on the key) and then calculate summaries until the -key value changes. In this case @code{LIMIT #} will not calculate any -unnecessary @code{GROUP BY}s. -@item -As soon as MySQL has sent the first @code{#} rows to the client, it -will abort the query (If you are not using @code{SQL_CALC_FOUND_ROWS}). -@item -@code{LIMIT 0} will always quickly return an empty set. This is useful -to check the query and to get the column types of the result columns. -@item -When the server uses temporary tables to resolve the query, the -@code{LIMIT #} is used to calculate how much space is required. -@end itemize - - -@node Insert speed, Update speed, LIMIT optimisation, Query Speed -@subsection Speed of @code{INSERT} Queries - -@findex INSERT - -@cindex speed, inserting -@cindex inserting, speed of - -The time to insert a record consists approximately of: - -@itemize @bullet -@item -Connect: (3) -@item -Sending query to server: (2) -@item -Parsing query: (2) -@item -Inserting record: (1 x size of record) -@item -Inserting indexes: (1 x number of indexes) -@item -Close: (1) -@end itemize - -where the numbers are somewhat proportional to the overall time. This -does not take into consideration the initial overhead to open tables -(which is done once for each concurrently running query). - -The size of the table slows down the insertion of indexes by log N -(B-trees). - -Some ways to speed up inserts: - -@itemize @bullet -@item -If you are inserting many rows from the same client at the same time, use -multiple value lists @code{INSERT} statements. This is much faster (many times -in some cases) than using separate @code{INSERT} statements. If you are adding -data to non-empty table, you may tune up @code{bulk_insert_buffer_size} -variable to make it even faster. @xref{SHOW VARIABLES}. -@item -If you are inserting a lot of rows from different clients, you can get -higher speed by using the @code{INSERT DELAYED} statement. @xref{INSERT, -, @code{INSERT}}. -@item -Note that with @code{MyISAM} tables you can insert rows at the same time -@code{SELECT}s are running if there are no deleted rows in the tables. -@item -When loading a table from a text file, use @code{LOAD DATA INFILE}. This -is usually 20 times faster than using a lot of @code{INSERT} statements. -@xref{LOAD DATA, , @code{LOAD DATA}}. -@item -It is possible with some extra work to make @code{LOAD DATA INFILE} run even -faster when the table has many indexes. Use the following procedure: - -@enumerate -@item -Optionally create the table with @code{CREATE TABLE}. For example, using -@code{mysql} or Perl-DBI. - -@item -Execute a @code{FLUSH TABLES} statement or the shell command @code{mysqladmin -flush-tables}. - -@item -Use @code{myisamchk --keys-used=0 -rq /path/to/db/tbl_name}. This will -remove all usage of all indexes from the table. - -@item -Insert data into the table with @code{LOAD DATA INFILE}. This will not -update any indexes and will therefore be very fast. - -@item -If you are going to only read the table in the future, run @code{myisampack} -on it to make it smaller. @xref{Compressed format}. - -@item -Re-create the indexes with @code{myisamchk -r -q -/path/to/db/tbl_name}. This will create the index tree in memory before -writing it to disk, which is much faster because it avoids lots of disk -seeks. The resulting index tree is also perfectly balanced. - -@item -Execute a @code{FLUSH TABLES} statement or the shell command @code{mysqladmin -flush-tables}. -@end enumerate - -Note that @code{LOAD DATA INFILE} also does the above optimisation if -you insert into an empty table; the main difference with the above -procedure is that you can let @code{myisamchk} allocate much more temporary -memory for the index creation that you may want MySQL to allocate for -every index recreation. - -Since MySQL 4.0 you can also use -@code{ALTER TABLE tbl_name DISABLE KEYS} instead of -@code{myisamchk --keys-used=0 -rq /path/to/db/tbl_name} and -@code{ALTER TABLE tbl_name ENABLE KEYS} instead of -@code{myisamchk -r -q /path/to/db/tbl_name}. This way you can also skip -@code{FLUSH TABLES} steps. -@item -You can speed up insertions that is done over multiple statements by -locking your tables: - -@example -mysql> LOCK TABLES a WRITE; -mysql> INSERT INTO a VALUES (1,23),(2,34),(4,33); -mysql> INSERT INTO a VALUES (8,26),(6,29); -mysql> UNLOCK TABLES; -@end example - -The main speed difference is that the index buffer is flushed to disk only -once, after all @code{INSERT} statements have completed. Normally there would -be as many index buffer flushes as there are different @code{INSERT} -statements. Locking is not needed if you can insert all rows with a single -statement. - -For transactional tables, you should use @code{BEGIN/COMMIT} instead of -@code{LOCK TABLES} to get a speedup. - -Locking will also lower the total time of multi-connection tests, but the -maximum wait time for some threads will go up (because they wait for -locks). For example: - -@example -thread 1 does 1000 inserts -thread 2, 3, and 4 does 1 insert -thread 5 does 1000 inserts -@end example - -If you don't use locking, 2, 3, and 4 will finish before 1 and 5. If you -use locking, 2, 3, and 4 probably will not finish before 1 or 5, but the -total time should be about 40% faster. - -As @code{INSERT}, @code{UPDATE}, and @code{DELETE} operations are very -fast in MySQL, you will obtain better overall performance by -adding locks around everything that does more than about 5 inserts or -updates in a row. If you do very many inserts in a row, you could do a -@code{LOCK TABLES} followed by an @code{UNLOCK TABLES} once in a while -(about each 1000 rows) to allow other threads access to the table. This -would still result in a nice performance gain. - -Of course, @code{LOAD DATA INFILE} is much faster for loading data. -@end itemize - -To get some more speed for both @code{LOAD DATA INFILE} and -@code{INSERT}, enlarge the key buffer. @xref{Server parameters}. - - -@node Update speed, Delete speed, Insert speed, Query Speed -@subsection Speed of @code{UPDATE} Queries - -Update queries are optimised as a @code{SELECT} query with the additional -overhead of a write. The speed of the write is dependent on the size of -the data that is being updated and the number of indexes that are -updated. Indexes that are not changed will not be updated. - -Also, another way to get fast updates is to delay updates and then do -many updates in a row later. Doing many updates in a row is much quicker -than doing one at a time if you lock the table. - -Note that, with dynamic record format, updating a record to -a longer total length may split the record. So if you do this often, -it is very important to @code{OPTIMIZE TABLE} sometimes. -@xref{OPTIMIZE TABLE, , @code{OPTIMIZE TABLE}}. - - -@node Delete speed, Tips, Update speed, Query Speed -@subsection Speed of @code{DELETE} Queries - -If you want to delete all rows in the table, you should use -@code{TRUNCATE TABLE table_name}. @xref{TRUNCATE}. - -The time to delete a record is exactly proportional to the number of -indexes. To delete records more quickly, you can increase the size of -the index cache. @xref{Server parameters}. - - -@node Tips, , Delete speed, Query Speed -@subsection Other Optimisation Tips - -@cindex optimisation, tips -@cindex tips, optimisation - -Unsorted tips for faster systems: - -@itemize @bullet -@item -Use persistent connections to the database to avoid the connection -overhead. If you can't use persistent connections and you are doing a -lot of new connections to the database, you may want to change the value -of the @code{thread_cache_size} variable. @xref{Server parameters}. -@item -Always check that all your queries really use the indexes you have created -in the tables. In MySQL you can do this with the @code{EXPLAIN} -command. @xref{EXPLAIN, Explain, Explain, manual}. -@item -Try to avoid complex @code{SELECT} queries on @code{MyISAM} tables that are -updated a lot. This is to avoid problems with table locking. -@item -The new @code{MyISAM} tables can insert rows in a table without deleted -rows at the same time another table is reading from it. If this is important -for you, you should consider methods where you don't have to delete rows -or run @code{OPTIMIZE TABLE} after you have deleted a lot of rows. -@item -Use @code{ALTER TABLE ... ORDER BY expr1,expr2...} if you mostly -retrieve rows in @code{expr1,expr2...} order. By using this option after big -changes to the table, you may be able to get higher performance. -@item -In some cases it may make sense to introduce a column that is 'hashed' -based on information from other columns. If this column is short and -reasonably unique it may be much faster than a big index on many -columns. In MySQL it's very easy to use this extra column: -@code{SELECT * FROM table_name WHERE hash=MD5(CONCAT(col1,col2)) -AND col_1='constant' AND col_2='constant'} -@item -For tables that change a lot you should try to avoid all @code{VARCHAR} -or @code{BLOB} columns. You will get dynamic row length as soon as you -are using a single @code{VARCHAR} or @code{BLOB} column. @xref{Table -types}. -@item -It's not normally useful to split a table into different tables just -because the rows gets 'big'. To access a row, the biggest performance -hit is the disk seek to find the first byte of the row. After finding -the data most new disks can read the whole row fast enough for most -applications. The only cases where it really matters to split up a table is if -it's a dynamic row size table (see above) that you can change to a fixed -row size, or if you very often need to scan the table and don't need -most of the columns. @xref{Table types}. -@item -If you very often need to calculate things based on information from a -lot of rows (like counts of things), it's probably much better to -introduce a new table and update the counter in real time. An update of -type @code{UPDATE table set count=count+1 where index_column=constant} -is very fast! - -This is really important when you use MySQL table types like MyISAM and -ISAM that -only have table locking (multiple readers / single writers). This will -also give better performance with most databases, as the row locking -manager in this case will have less to do. -@item -If you need to collect statistics from big log tables, use summary tables -instead of scanning the whole table. Maintaining the summaries should be -much faster than trying to do statistics 'live'. It's much faster to -regenerate new summary tables from the logs when things change -(depending on business decisions) than to have to change the running -application! -@item -If possible, one should classify reports as 'live' or 'statistical', -where data needed for statistical reports are only generated based on -summary tables that are generated from the actual data. -@item -Take advantage of the fact that columns have default values. Insert -values explicitly only when the value to be inserted differs from the -default. This reduces the parsing that MySQL need to do and -improves the insert speed. -@item -In some cases it's convenient to pack and store data into a blob. In this -case you have to add some extra code in your application to pack/unpack -things in the blob, but this may save a lot of accesses at some stage. -This is practical when you have data that doesn't conform to a static -table structure. -@item -Normally you should try to keep all data non-redundant (what -is called 3rd normal form in database theory), but you should not be -afraid of duplicating things or creating summary tables if you need these -to gain more speed. -@item -Stored procedures or UDF (user-defined functions) may be a good way to -get more performance. In this case you should, however, always have a way -to do this some other (slower) way if you use some database that doesn't -support this. -@item -You can always gain something by caching queries/answers in your -application and trying to do many inserts/updates at the same time. If -your database supports lock tables (like MySQL and Oracle), -this should help to ensure that the index cache is only flushed once -after all updates. -@item -Use @code{INSERT /*! DELAYED */} when you do not need to know when your -data is written. This speeds things up because many records can be written -with a single disk write. -@item -Use @code{INSERT /*! LOW_PRIORITY */} when you want your selects to be -more important. -@item -Use @code{SELECT /*! HIGH_PRIORITY */} to get selects that jump the -queue. That is, the select is done even if there is somebody waiting to -do a write. -@item -Use the multi-line @code{INSERT} statement to store many rows with one -SQL command (many SQL servers supports this). -@item -Use @code{LOAD DATA INFILE} to load bigger amounts of data. This is -faster than normal inserts and will be even faster when @code{myisamchk} -is integrated in @code{mysqld}. -@item -Use @code{AUTO_INCREMENT} columns to make unique values. -@item -Use @code{OPTIMIZE TABLE} once in a while to avoid fragmentation when -using a dynamic table format. @xref{OPTIMIZE TABLE, , @code{OPTIMIZE TABLE}}. - -@item -Use @code{HEAP} tables to get more speed when possible. @xref{Table -types}. -@item -When using a normal web server setup, images should be stored as -files. That is, store only a file reference in the database. The main -reason for this is that a normal web server is much better at caching -files than database contents. So it it's much easier to get a fast -system if you are using files. -@item -Use in memory tables for non-critical data that are accessed often (like -information about the last shown banner for users that don't have -cookies). -@item -Columns with identical information in different tables should be -declared identical and have identical names. Before Version 3.23 you -got slow joins otherwise. - -Try to keep the names simple (use @code{name} instead of -@code{customer_name} in the customer table). To make your names portable -to other SQL servers you should keep them shorter than 18 characters. -@item -If you need really high speed, you should take a look at the low-level -interfaces for data storage that the different SQL servers support! For -example, by accessing the MySQL @code{MyISAM} directly, you could -get a speed increase of 2-5 times compared to using the SQL interface. -To be able to do this the data must be on the same server as -the application, and usually it should only be accessed by one process -(because external file locking is really slow). One could eliminate the -above problems by introducing low-level @code{MyISAM} commands in the -MySQL server (this could be one easy way to get more -performance if needed). By carefully designing the database interface, -it should be quite easy to support this types of optimisation. -@item -In many cases it's faster to access data from a database (using a live -connection) than accessing a text file, just because the database is -likely to be more compact than the text file (if you are using numerical -data), and this will involve fewer disk accesses. You will also save -code because you don't have to parse your text files to find line and -column boundaries. -@item -You can also use replication to speed things up. @xref{Replication}. -@item -Declaring a table with @code{DELAY_KEY_WRITE=1} will make the updating of -indexes faster, as these are not logged to disk until the file is closed. -The downside is that you should run @code{myisamchk} on these tables before -you start @code{mysqld} to ensure that they are okay if something killed -@code{mysqld} in the middle. As the key information can always be generated -from the data, you should not lose anything by using @code{DELAY_KEY_WRITE}. -@end itemize - - -@node Locking Issues, Optimising Database Structure, Query Speed, MySQL Optimisation -@section Locking Issues - - -@menu -* Internal locking:: How MySQL Locks Tables -* Table locking:: Table Locking Issues -@end menu - - -@node Internal locking, Table locking, Locking Issues, Locking Issues -@subsection How MySQL Locks Tables - -@cindex internal locking -@cindex locking, tables -@cindex tables, locking - -You can find a discussion about different locking methods in the appendix. -@xref{Locking methods}. - -All locking in MySQL is deadlock-free, except for @code{InnoDB} and -@code{BDB} type tables. -This is managed by always -requesting all needed locks at once at the beginning of a query and always -locking the tables in the same order. - -@code{InnoDB} type tables automatically acquire their row locks and -@code{BDB} type tables -their page locks during the processing of SQL statements, not at the start -of the transaction. - -The locking method MySQL uses for @code{WRITE} locks works as follows: - -@itemize @bullet -@item -If there are no locks on the table, put a write lock on it. -@item -Otherwise, put the lock request in the write lock queue. -@end itemize - -The locking method MySQL uses for @code{READ} locks works as follows: - -@itemize @bullet -@item -If there are no write locks on the table, put a read lock on it. -@item -Otherwise, put the lock request in the read lock queue. -@end itemize - -When a lock is released, the lock is made available to the threads -in the write lock queue, then to the threads in the read lock queue. - -This means that if you have many updates on a table, @code{SELECT} -statements will wait until there are no more updates. - -To work around this for the case where you want to do many @code{INSERT} and -@code{SELECT} operations on a table, you can insert rows in a temporary -table and update the real table with the records from the temporary table -once in a while. - -This can be done with the following code: -@example -mysql> LOCK TABLES real_table WRITE, insert_table WRITE; -mysql> INSERT INTO real_table SELECT * FROM insert_table; -mysql> TRUNCATE TABLE insert_table; -mysql> UNLOCK TABLES; -@end example - -You can use the @code{LOW_PRIORITY} options with @code{INSERT}, -@code{UPDATE} or @code{DELETE} or @code{HIGH_PRIORITY} with -@code{SELECT} if you want to prioritise retrieval in some specific -cases. You can also start @code{mysqld} with @code{--low-priority-updates} -to get the same behaveour. - -Using @code{SQL_BUFFER_RESULT} can also help making table locks shorter. -@xref{SELECT}. - -You could also change the locking code in @file{mysys/thr_lock.c} to use a -single queue. In this case, write locks and read locks would have the same -priority, which might help some applications. - - -@node Table locking, , Internal locking, Locking Issues -@subsection Table Locking Issues - -@cindex problems, table locking - -The table locking code in MySQL is deadlock free. - -MySQL uses table locking (instead of row locking or column -locking) on all table types, except @code{InnoDB} and @code{BDB} tables, -to achieve a very -high lock speed. For large tables, table locking is much better than -row locking for most applications, but there are, of course, some -pitfalls. - -For @code{InnoDB} and @code{BDB} tables, MySQL only uses table -locking if you explicitly lock the table with @code{LOCK TABLES}. -For these table types we recommend you to not use -@code{LOCK TABLES} at all, because @code{InnoDB} uses automatic -row level locking and @code{BDB} uses page level locking to -ensure transaction isolation. - -In MySQL Version 3.23.7 and above, you can insert rows into -@code{MyISAM} tables at the same time other threads are reading from the -table. Note that currently this only works if there are no holes after -deleted rows in the table at the time the insert is made. When all holes -has been filled with new data, concurrent inserts will automatically be -enabled again. - -Table locking enables many threads to read from a table at the same -time, but if a thread wants to write to a table, it must first get -exclusive access. During the update, all other threads that want to -access this particular table will wait until the update is ready. - -As updates on tables normally are considered to be more important than -@code{SELECT}, all statements that update a table have higher priority -than statements that retrieve information from a table. This should -ensure that updates are not 'starved' because one issues a lot of heavy -queries against a specific table. (You can change this by using -@code{LOW_PRIORITY} with the statement that does the update or -@code{HIGH_PRIORITY} with the @code{SELECT} statement.) - -Starting from MySQL Version 3.23.7 one can use the -@code{max_write_lock_count} variable to force MySQL to -temporary give all @code{SELECT} statements, that wait for a table, a -higher priority after a specific number of inserts on a table. - -Table locking is, however, not very good under the following senario: - -@itemize @bullet -@item -A client issues a @code{SELECT} that takes a long time to run. -@item -Another client then issues an @code{UPDATE} on a used table. This client -will wait until the @code{SELECT} is finished. -@item -Another client issues another @code{SELECT} statement on the same table. As -@code{UPDATE} has higher priority than @code{SELECT}, this @code{SELECT} -will wait for the @code{UPDATE} to finish. It will also wait for the first -@code{SELECT} to finish! -@item -A thread is waiting for something like @code{full disk}, in which case all -threads that wants to access the problem table will also be put in a waiting -state until more disk space is made available. -@end itemize - -Some possible solutions to this problem are: - -@itemize @bullet -@item -Try to get the @code{SELECT} statements to run faster. You may have to create -some summary tables to do this. - -@item -Start @code{mysqld} with @code{--low-priority-updates}. This will give -all statements that update (modify) a table lower priority than a @code{SELECT} -statement. In this case the last @code{SELECT} statement in the previous -scenario would execute before the @code{INSERT} statement. - -@item -You can give a specific @code{INSERT}, @code{UPDATE}, or @code{DELETE} -statement lower priority with the @code{LOW_PRIORITY} attribute. - -@item -Start @code{mysqld} with a low value for @code{max_write_lock_count} to give -@code{READ} locks after a certain number of @code{WRITE} locks. - -@item -You can specify that all updates from a specific thread should be done with -low priority by using the SQL command: @code{SET LOW_PRIORITY_UPDATES=1}. -@xref{SET OPTION, , @code{SET}}. - -@item -You can specify that a specific @code{SELECT} is very important with the -@code{HIGH_PRIORITY} attribute. @xref{SELECT, , @code{SELECT}}. - -@item -If you have problems with @code{INSERT} combined with @code{SELECT}, -switch to use the new @code{MyISAM} tables as these support concurrent -@code{SELECT}s and @code{INSERT}s. - -@item -If you mainly mix @code{INSERT} and @code{SELECT} statements, the -@code{DELAYED} attribute to @code{INSERT} will probably solve your problems. -@xref{INSERT, , @code{INSERT}}. - -@item -If you have problems with @code{SELECT} and @code{DELETE}, the @code{LIMIT} -option to @code{DELETE} may help. @xref{DELETE, , @code{DELETE}}. -@end itemize - - -@node Optimising Database Structure, Optimising the Server, Locking Issues, MySQL Optimisation -@section Optimising Database Structure - - -@menu -* Design:: Design Choices -* Data size:: Get Your Data as Small as Possible -* MySQL indexes:: How MySQL Uses Indexes -* Indexes:: Column Indexes -* Multiple-column indexes:: Multiple-Column Indexes -* Open tables:: Why So Many Open tables? -* Table cache:: How MySQL Opens and Closes Tables -* Creating many tables:: Drawbacks to Creating Large Numbers of Tables in the Same Database -@end menu - - -@node Design, Data size, Optimising Database Structure, Optimising Database Structure -@subsection Design Choices - -@cindex design, choices -@cindex database design -@cindex storage of data - -MySQL keeps row data and index data in separate files. Many (almost -all) other databases mix row and index data in the same file. We believe that -the MySQL choice is better for a very wide range of modern systems. - -Another way to store the row data is to keep the information for each -column in a separate area (examples are SDBM and Focus). This will cause a -performance hit for every query that accesses more than one column. Because -this degenerates so quickly when more than one column is accessed, -we believe that this model is not good for general purpose databases. - -The more common case is that the index and data are stored together -(like in Oracle/Sybase et al). In this case you will find the row -information at the leaf page of the index. The good thing with this -layout is that it, in many cases, depending on how well the index is -cached, saves a disk read. The bad things with this layout are: - -@itemize @bullet -@item -Table scanning is much slower because you have to read through the indexes -to get at the data. -@item -You can't use only the index table to retrieve data for a query. -@item -You lose a lot of space, as you must duplicate indexes from the nodes -(as you can't store the row in the nodes). -@item -Deletes will degenerate the table over time (as indexes in nodes are -usually not updated on delete). -@item -It's harder to cache only the index data. -@end itemize - - -@node Data size, MySQL indexes, Design, Optimising Database Structure -@subsection Get Your Data as Small as Possible - -@cindex data, size -@cindex reducing, data size -@cindex storage space, minimising -@cindex tables, improving performance -@cindex performance, improving - -One of the most basic optimisation is to get your data (and indexes) to -take as little space on the disk (and in memory) as possible. This can -give huge improvements because disk reads are faster and normally less -main memory will be used. Indexing also takes less resources if -done on smaller columns. - -MySQL supports a lot of different table types and row formats. -Choosing the right table format may give you a big performance gain. -@xref{Table types}. - -You can get better performance on a table and minimise storage space -using the techniques listed here: - -@itemize @bullet -@item -Use the most efficient (smallest) types possible. MySQL has -many specialised types that save disk space and memory. - -@item -Use the smaller integer types if possible to get smaller tables. For -example, @code{MEDIUMINT} is often better than @code{INT}. - -@item -Declare columns to be @code{NOT NULL} if possible. It makes everything -faster and you save one bit per column. Note that if you really need -@code{NULL} in your application you should definitely use it. Just avoid -having it on all columns by default. - -@item -If you don't have any variable-length columns (@code{VARCHAR}, -@code{TEXT}, or @code{BLOB} columns), a fixed-size record format is -used. This is faster but unfortunately may waste some space. -@xref{MyISAM table formats, , @code{MyISAM} table formats}. - -@item -The primary index of a table should be as short as possible. This makes -identification of one row easy and efficient. - -@item -For each table, you have to decide which storage/index method to -use. @xref{Table types}. - -@item -Only create the indexes that you really need. Indexes are good for -retrieval but bad when you need to store things fast. If you mostly -access a table by searching on a combination of columns, make an index -on them. The first index part should be the most used column. If you are -@strong{always} using many columns, you should use the column with more duplicates -first to get better compression of the index. - -@item -If it's very likely that a column has a unique prefix on the first number -of characters, it's better to only index this prefix. MySQL -supports an index on a part of a character column. Shorter indexes are -faster not only because they take less disk space but also because they -will give you more hits in the index cache and thus fewer disk -seeks. @xref{Server parameters}. - -@item -In some circumstances it can be beneficial to split into two a table that is -scanned very often. This is especially true if it is a dynamic -format table and it is possible to use a smaller static format table that -can be used to find the relevant rows when scanning the table. -@end itemize - - -@node MySQL indexes, Indexes, Data size, Optimising Database Structure -@subsection How MySQL Uses Indexes - -@cindex indexes, use of - -Indexes are used to find rows with a specific value of one column -fast. Without an index MySQL has to start with the first record -and then read through the whole table until it finds the relevant -rows. The bigger the table, the more this costs. If the table has an index -for the columns in question, MySQL can quickly get a position to -seek to in the middle of the datafile without having to look at all the -data. If a table has 1000 rows, this is at least 100 times faster than -reading sequentially. Note that if you need to access almost all 1000 -rows it is faster to read sequentially because we then avoid disk seeks. - -All MySQL indexes (@code{PRIMARY}, @code{UNIQUE}, and -@code{INDEX}) are stored in B-trees. Strings are automatically prefix- -and end-space compressed. @xref{CREATE INDEX, , @code{CREATE INDEX}}. - -Indexes are used to: -@itemize @bullet -@item -Quickly find the rows that match a @code{WHERE} clause. - -@item -Retrieve rows from other tables when performing joins. - -@item -Find the @code{MAX()} or @code{MIN()} value for a specific indexed -column. This is optimised by a preprocessor that checks if you are -using @code{WHERE} key_part_# = constant on all key parts < N. In this case -MySQL will do a single key lookup and replace the @code{MIN()} -expression with a constant. If all expressions are replaced with -constants, the query will return at once: - -@example -SELECT MIN(key_part2),MAX(key_part2) FROM table_name where key_part1=10 -@end example - -@item -Sort or group a table if the sorting or grouping is done on a leftmost -prefix of a usable key (for example, @code{ORDER BY -key_part_1,key_part_2 }). The key is read in reverse order if all key -parts are followed by @code{DESC}. @xref{ORDER BY optimisation}. - -@item -In some cases a query can be optimised to retrieve values without -consulting the datafile. If all used columns for some table are numeric -and form a leftmost prefix for some key, the values may be retrieved -from the index tree for greater speed: - -@example -SELECT key_part3 FROM table_name WHERE key_part1=1 -@end example - -@end itemize - -Suppose you issue the following @code{SELECT} statement: - -@example -mysql> SELECT * FROM tbl_name WHERE col1=val1 AND col2=val2; -@end example - -If a multiple-column index exists on @code{col1} and @code{col2}, the -appropriate rows can be fetched directly. If separate single-column -indexes exist on @code{col1} and @code{col2}, the optimiser tries to -find the most restrictive index by deciding which index will find fewer -rows and using that index to fetch the rows. - -@cindex indexes, leftmost prefix of -@cindex leftmost prefix of indexes -If the table has a multiple-column index, any leftmost prefix of the -index can be used by the optimiser to find rows. For example, if you -have a three-column index on @code{(col1,col2,col3)}, you have indexed -search capabilities on @code{(col1)}, @code{(col1,col2)}, and -@code{(col1,col2,col3)}. - -MySQL can't use a partial index if the columns don't form a -leftmost prefix of the index. Suppose you have the @code{SELECT} -statements shown here: - -@example -mysql> SELECT * FROM tbl_name WHERE col1=val1; -mysql> SELECT * FROM tbl_name WHERE col2=val2; -mysql> SELECT * FROM tbl_name WHERE col2=val2 AND col3=val3; -@end example - -If an index exists on @code{(col1,col2,col3)}, only the first query -shown above uses the index. The second and third queries do involve -indexed columns, but @code{(col2)} and @code{(col2,col3)} are not -leftmost prefixes of @code{(col1,col2,col3)}. - -@findex LIKE, and indexes -@findex LIKE, and wildcards -@cindex indexes, and @code{LIKE} -@cindex wildcards, and @code{LIKE} -MySQL also uses indexes for @code{LIKE} comparisons if the argument -to @code{LIKE} is a constant string that doesn't start with a wildcard -character. For example, the following @code{SELECT} statements use indexes: - -@example -mysql> SELECT * FROM tbl_name WHERE key_col LIKE "Patrick%"; -mysql> SELECT * FROM tbl_name WHERE key_col LIKE "Pat%_ck%"; -@end example - -In the first statement, only rows with @code{"Patrick" <= key_col < -"Patricl"} are considered. In the second statement, only rows with -@code{"Pat" <= key_col < "Pau"} are considered. - -The following @code{SELECT} statements will not use indexes: -@example -mysql> SELECT * FROM tbl_name WHERE key_col LIKE "%Patrick%"; -mysql> SELECT * FROM tbl_name WHERE key_col LIKE other_col; -@end example - -In the first statement, the @code{LIKE} value begins with a wildcard -character. In the second statement, the @code{LIKE} value is not a -constant. - -MySQL 4.0 does another optimisation on @code{LIKE}. If you use -@code{... LIKE "%string%"} and @code{string} is longer than 3 characters, -MySQL will use the @code{Turbo Boyer-Moore} algorithm to initialise the -pattern for the string and then use this pattern to perform the search -quicker. - -@findex IS NULL, and indexes -@cindex indexes, and @code{IS NULL} -Searching using @code{column_name IS NULL} will use indexes if column_name -is an index. - -MySQL normally uses the index that finds the least number of rows. An -index is used for columns that you compare with the following operators: -@code{=}, @code{>}, @code{>=}, @code{<}, @code{<=}, @code{BETWEEN}, and a -@code{LIKE} with a non-wildcard prefix like @code{'something%'}. - -Any index that doesn't span all @code{AND} levels in the @code{WHERE} clause -is not used to optimise the query. In other words: To be able to use an -index, a prefix of the index must be used in every @code{AND} group. - -The following @code{WHERE} clauses use indexes: -@example -... WHERE index_part1=1 AND index_part2=2 AND other_column=3 -... WHERE index=1 OR A=10 AND index=2 /* index = 1 OR index = 2 */ -... WHERE index_part1='hello' AND index_part_3=5 - /* optimised like "index_part1='hello'" */ -... WHERE index1=1 and index2=2 or index1=3 and index3=3; - /* Can use index on index1 but not on index2 or index 3 */ -@end example - -These @code{WHERE} clauses do @strong{NOT} use indexes: -@example -... WHERE index_part2=1 AND index_part3=2 /* index_part_1 is not used */ -... WHERE index=1 OR A=10 /* Index is not used in - both AND parts */ -... WHERE index_part1=1 OR index_part2=10 /* No index spans all rows */ -@end example - -Note that in some cases MySQL will not use an index, even if one -would be available. Some of the cases where this happens are: - -@itemize @bullet -@item -If the use of the index would require MySQL to access more -than 30% of the rows in the table. (In this case a table scan is -probably much faster, as this will require us to do much fewer seeks.) -Note that if such a query uses @code{LIMIT} to only retrieve -part of the rows, MySQL will use an index anyway, as it can -much more quickly find the few rows to return in the result. -@item -If the index range may contain @code{NULL} values and you are using -@code{ORDER BY ... DESC} -@end itemize - -@node Indexes, Multiple-column indexes, MySQL indexes, Optimising Database Structure -@subsection Column Indexes - -@cindex indexes, columns -@cindex columns, indexes -@cindex keys - -All MySQL column types can be indexed. Use of indexes on the -relevant columns is the best way to improve the performance of @code{SELECT} -operations. - -The maximum number of keys and the maximum index length is defined per -table handler. @xref{Table types}. You can with all table handlers have -at least 16 keys and a total index length of at least 256 bytes. - -For @code{CHAR} and @code{VARCHAR} columns, you can index a prefix of a -column. This is much faster and requires less disk space than indexing the -whole column. The syntax to use in the @code{CREATE TABLE} statement to -index a column prefix looks like this: - -@example -KEY index_name (col_name(length)) -@end example - -The example here creates an index for the first 10 characters of the -@code{name} column: - -@example -mysql> CREATE TABLE test ( - -> name CHAR(200) NOT NULL, - -> KEY index_name (name(10))); -@end example - -For @code{BLOB} and @code{TEXT} columns, you must index a prefix of the -column. You cannot index the entire column. - -In MySQL Version 3.23.23 or later, you can also create special -@code{FULLTEXT} indexes. They are used for full-text search. Only the -@code{MyISAM} table type supports @code{FULLTEXT} indexes. They can be -created only from @code{CHAR}, @code{VARCHAR}, and @code{TEXT} columns. -Indexing always happens over the entire column and partial indexing is not -supported. See @ref{Fulltext Search} for details. - -@node Multiple-column indexes, Open tables, Indexes, Optimising Database Structure -@subsection Multiple-Column Indexes - -@cindex multi-column indexes -@cindex indexes, multi-column -@cindex keys, multi-column - -MySQL can create indexes on multiple columns. An index may -consist of up to 15 columns. (On @code{CHAR} and @code{VARCHAR} columns you -can also use a prefix of the column as a part of an index.) - -A multiple-column index can be considered a sorted array containing values -that are created by concatenating the values of the indexed columns. - -MySQL uses multiple-column indexes in such a way that queries are -fast when you specify a known quantity for the first column of the index in a -@code{WHERE} clause, even if you don't specify values for the other columns. - -Suppose a table is created using the following specification: - -@example -mysql> CREATE TABLE test ( - -> id INT NOT NULL, - -> last_name CHAR(30) NOT NULL, - -> first_name CHAR(30) NOT NULL, - -> PRIMARY KEY (id), - -> INDEX name (last_name,first_name)); -@end example - -Then the index @code{name} is an index over @code{last_name} and -@code{first_name}. The index will be used for queries that specify -values in a known range for @code{last_name}, or for both @code{last_name} -and @code{first_name}. -Therefore, the @code{name} index will be used in the following queries: - -@example -mysql> SELECT * FROM test WHERE last_name="Widenius"; - -mysql> SELECT * FROM test WHERE last_name="Widenius" - -> AND first_name="Michael"; - -mysql> SELECT * FROM test WHERE last_name="Widenius" - -> AND (first_name="Michael" OR first_name="Monty"); - -mysql> SELECT * FROM test WHERE last_name="Widenius" - -> AND first_name >="M" AND first_name < "N"; -@end example - -However, the @code{name} index will NOT be used in the following queries: - -@example -mysql> SELECT * FROM test WHERE first_name="Michael"; - -mysql> SELECT * FROM test WHERE last_name="Widenius" - -> OR first_name="Michael"; -@end example - -For more information on the manner in which MySQL uses indexes to -improve query performance, see @ref{MySQL indexes, , MySQL -indexes}. - -@node Open tables, Table cache, Multiple-column indexes, Optimising Database Structure -@subsection Why So Many Open tables? - -@cindex tables, open -@cindex open tables - -When you run @code{mysqladmin status}, you'll see something like this: - -@example -Uptime: 426 Running threads: 1 Questions: 11082 Reloads: 1 Open tables: 12 -@end example - -This can be somewhat perplexing if you only have 6 tables. - -MySQL is multi-threaded, so it may have many queries on the same table -simultaneously. To minimise the problem with two threads having -different states on the same file, the table is opened independently by -each concurrent thread. This takes some memory but will normaly increase -performance. Wth @code{ISAM} and @code{MyISAM} tables this also requires -one extra file descriptor for the datafile. With these table types the index -file descriptor is shared between all threads. - -You can read more about this topic in the next section. @xref{Table cache}. - -@node Table cache, Creating many tables, Open tables, Optimising Database Structure -@subsection How MySQL Opens and Closes Tables - -@findex table_cache - -@cindex tables, opening -@cindex tables, closing -@cindex opening, tables -@cindex closing, tables -@cindex table cache - -@code{table_cache}, @code{max_connections}, and @code{max_tmp_tables} -affect the maximum number of files the server keeps open. If you -increase one or both of these values, you may run up against a limit -imposed by your operating system on the per-process number of open file -descriptors. However, you can increase the limit on many systems. -Consult your OS documentation to find out how to do this, because the -method for changing the limit varies widely from system to system. - -@code{table_cache} is related to @code{max_connections}. For example, -for 200 concurrent running connections, you should have a table cache of -at least @code{200 * n}, where @code{n} is the maximum number of tables -in a join. You also need to reserve some extra file descriptors for -temporary tables and files. - -Make sure that your operating system can handle the number of open file -descriptors implied by the @code{table_cache} setting. If -@code{table_cache} is set too high, MySQL may run out of file -descriptors and refuse connections, fail to perform queries, and be very -unreliable. You also have to take into account that the @code{MyISAM} table -handler needs two file descriptors for each unique open table. You can -in increase the number of file descriptors available for MySQL with -the @code{--open-files-limit=#} startup option. @xref{Not enough file -handles}. - -The cache of open tables will be keept at a level of @code{table_cache} -entries (default 64; this can be changed with the @code{-O -table_cache=#} option to @code{mysqld}). Note that in MySQL may -temporarly open even more tables to be able to execute queries. - -A not used table is closed and removed from the table cache under the -following circumstances: - -@itemize @bullet -@item -When the cache is full and a thread tries to open a table that is not in -the cache. -@item -When the cache contains more than @code{table_cache} entries and -a thread is no longer using a table. -@item -When someone executes @code{mysqladmin refresh} or -@code{mysqladmin flush-tables}. -@item -When someone executes a @code{FLUSH TABLES} statement. -@end itemize - -When the table cache fills up, the server uses the following procedure -to locate a cache entry to use: - -@itemize @bullet -@item -Tables that are not currently in use are released, in least-recently-used -order. - -@item -If the cache is full and no tables can be released, but a new table needs to -be opened, the cache is temporarily extended as necessary. - -@item -If the cache is in a temporarily-extended state and a table goes from in-use -to not-in-use state, the table is closed and released from the cache. -@end itemize - -A table is opened for each concurrent access. This means that -if you have two threads accessing the same table or access the table -twice in the same query (with @code{AS}) the table needs to be opened twice. -The first open of any table takes two file descriptors; each additional -use of the table takes only one file descriptor. The extra descriptor -for the first open is used for the index file; this descriptor is shared -among all threads. - -If you are opening a table with the @code{HANDLER table_name OPEN} -statement, a dedicated table object is allocated for the thread. -This table object is not shared by other threads an will not be closed -until the thread calls @code{HANDLER table_name CLOSE} or the thread dies. -@xref{HANDLER, , @code{HANDLER}}. When this happens, the table is put -back in the table cache (if it isn't full). - -You can check if your table cache is too small by checking the @code{mysqld} -variable @code{Opened_tables}. If this is quite big, even if you -haven't done a lot of @code{FLUSH TABLES}, you should increase your table -cache. @xref{SHOW STATUS, , @code{SHOW STATUS}}. - - -@node Creating many tables, , Table cache, Optimising Database Structure -@subsection Drawbacks to Creating Large Numbers of Tables in the Same Database - -@cindex tables, too many - -If you have many files in a directory, open, close, and create operations will -be slow. If you execute @code{SELECT} statements on many different tables, -there will be a little overhead when the table cache is full, because for -every table that has to be opened, another must be closed. You can reduce -this overhead by making the table cache larger. - - -@node Optimising the Server, Disk issues, Optimising Database Structure, MySQL Optimisation -@section Optimising the MySQL Server - - -@menu -* System:: System/Compile Time and Startup Parameter Tuning -* Server parameters:: Tuning Server Parameters -* Compile and link options:: How Compiling and Linking Affects the Speed of MySQL -* Memory use:: How MySQL Uses Memory -* DNS:: How MySQL uses DNS -* SET OPTION:: @code{SET} Syntax -@end menu - - -@node System, Server parameters, Optimising the Server, Optimising the Server -@subsection System/Compile Time and Startup Parameter Tuning - -@cindex compiling, optimising -@cindex system optimisation -@cindex startup parameters, tuning - -We start with the system level things since some of these decisions have -to be made very early. In other cases a fast look at this part may -suffice because it not that important for the big gains. However, it is always -nice to have a feeling about how much one could gain by changing things -at this level. - -The default OS to use is really important! To get the most use of -multiple-CPU machines one should use Solaris (because the threads works -really nice) or Linux (because the 2.2 kernel has really good SMP -support). Also on 32-bit machines Linux has a 2G file-size limit by -default. Hopefully this will be fixed soon when new filesystems are -released (XFS/Reiserfs). If you have a desperate need for files bigger -than 2G on Linux-intel 32 bit, you should get the LFS patch for the ext2 -filesystem. - -Because we have not run MySQL in production on that many platforms, we -advice you to test your intended platform before choosing it, if possible. - -@cindex locking -Other tips: -@itemize @bullet -@item -If you have enough RAM, you could remove all swap devices. Some -operating systems will use a swap device in some contexts even if you -have free memory. -@item -Use the @code{--skip-external-locking} MySQL option to avoid external -locking. Note that this will not impact MySQL's functionality as -long as you only run one server. Just remember to take down the server (or -lock relevant parts) before you run @code{myisamchk}. On some system -this switch is mandatory because the external locking does not work in any -case. - -The @code{--skip-external-locking} option is on by default when compiling with -MIT-pthreads, because @code{flock()} isn't fully supported by -MIT-pthreads on all platforms. It's also on default for Linux -as Linux file locking are not yet safe. - -The only case when you can't use @code{--skip-external-locking} is if you run -multiple MySQL @emph{servers} (not clients) on the same data, -or run @code{myisamchk} on the table without first flushing and locking -the @code{mysqld} server tables first. - -You can still use @code{LOCK TABLES}/@code{UNLOCK TABLES} even if you -are using @code{--skip-external-locking} -@end itemize - - -@node Server parameters, Compile and link options, System, Optimising the Server -@subsection Tuning Server Parameters - -@cindex parameters, server -@cindex @code{mysqld} server, buffer sizes -@cindex buffer sizes, @code{mysqld} server -@cindex startup parameters - -You can get the default buffer sizes used by the @code{mysqld} server -with this command: - -@example -shell> mysqld --help -@end example - -@cindex @code{mysqld} options -@cindex variables, @code{mysqld} -This command produces a list of all @code{mysqld} options and configurable -variables. The output includes the default values and looks something -like this: - -@example -Possible variables for option --set-variable (-O) are: -back_log current value: 5 -bdb_cache_size current value: 1048540 -binlog_cache_size current value: 32768 -connect_timeout current value: 5 -delayed_insert_timeout current value: 300 -delayed_insert_limit current value: 100 -delayed_queue_size current value: 1000 -flush_time current value: 0 -interactive_timeout current value: 28800 -join_buffer_size current value: 131072 -key_buffer_size current value: 1048540 -lower_case_table_names current value: 0 -long_query_time current value: 10 -max_allowed_packet current value: 1048576 -max_binlog_cache_size current value: 4294967295 -max_connections current value: 100 -max_connect_errors current value: 10 -max_delayed_threads current value: 20 -max_heap_table_size current value: 16777216 -max_join_size current value: 4294967295 -max_sort_length current value: 1024 -max_tmp_tables current value: 32 -max_write_lock_count current value: 4294967295 -myisam_sort_buffer_size current value: 8388608 -net_buffer_length current value: 16384 -net_retry_count current value: 10 -net_read_timeout current value: 30 -net_write_timeout current value: 60 -read_buffer_size current value: 131072 -record_rnd_buffer_size current value: 131072 -slow_launch_time current value: 2 -sort_buffer current value: 2097116 -table_cache current value: 64 -thread_concurrency current value: 10 -tmp_table_size current value: 1048576 -thread_stack current value: 131072 -wait_timeout current value: 28800 -@end example - -Please note that @code{--set-variable} is deprecated since -@strong{MySQL 4.0}, just use @code{--var=option} instead. - -If there is a @code{mysqld} server currently running, you can see what -values it actually is using for the variables by executing this command: - -@example -shell> mysqladmin variables -@end example - -You can find a full description for all variables in the @code{SHOW VARIABLES} -section in this manual. @xref{SHOW VARIABLES}. - -You can also see some statistics from a running server by issuing the command -@code{SHOW STATUS}. @xref{SHOW STATUS}. +This is an empty placeholder file for the MySQL manual. -MySQL uses algorithms that are very scalable, so you can usually -run with very little memory. If you, however, give MySQL more -memory, you will normally also get better performance. +The MySQL manual is now maintained in a separate BitKeeper source tree! +Please see @url{http://www.mysql.com/doc/en/Installing_source_tree.html} +for more info on how to work with BitKeeper. -When tuning a MySQL server, the two most important variables to use -are @code{key_buffer_size} and @code{table_cache}. You should first feel -confident that you have these right before trying to change any of the -other variables. +Please do not attempt to edit this file to add NEWS entries or to add +documentation! Use the one in the @code{mysqldoc} BK tree instead. -If you have much memory (>=256M) and many tables and want maximum performance -with a moderate number of clients, you should use something like this: +This file will be replaced with the current @code{manual.texi} when building +the official source distribution. -@example -shell> safe_mysqld -O key_buffer=64M -O table_cache=256 \ - -O sort_buffer=4M -O read_buffer_size=1M & -@end example - -If you have only 128M and only a few tables, but you still do a lot of -sorting, you can use something like: - -@example -shell> safe_mysqld -O key_buffer=16M -O sort_buffer=1M -@end example - -If you have little memory and lots of connections, use something like this: - -@example -shell> safe_mysqld -O key_buffer=512k -O sort_buffer=100k \ - -O read_buffer_size=100k & -@end example - -or even: - -@example -shell> safe_mysqld -O key_buffer=512k -O sort_buffer=16k \ - -O table_cache=32 -O read_buffer_size=8k -O net_buffer_length=1K & -@end example - -If you are doing a @code{GROUP BY} or @code{ORDER BY} on files that are -much bigger than your available memory you should increase the value of -@code{record_rnd_buffer} to speed up the reading of rows after the sorting -is done. - -When you have installed MySQL, the @file{support-files} directory will -contain some different @file{my.cnf} example files, @file{my-huge.cnf}, -@file{my-large.cnf}, @file{my-medium.cnf}, and @file{my-small.cnf}, you can -use as a base to optimise your system. - -If there are very many connections, ``swapping problems'' may occur unless -@code{mysqld} has been configured to use very little memory for each -connection. @code{mysqld} performs better if you have enough memory for all -connections, of course. - -Note that if you change an option to @code{mysqld}, it remains in effect only -for that instance of the server. - -To see the effects of a parameter change, do something like this: - -@example -shell> mysqld -O key_buffer=32m --help -@end example - -Make sure that the @code{--help} option is last; otherwise, the effect of any -options listed after it on the command-line will not be reflected in the -output. - - -@node Compile and link options, Memory use, Server parameters, Optimising the Server -@subsection How Compiling and Linking Affects the Speed of MySQL - -@cindex linking, speed -@cindex compiling, speed -@cindex speed, compiling -@cindex speed, linking - -Most of the following tests are done on Linux with the -MySQL benchmarks, but they should give some indication for -other operating systems and workloads. - -You get the fastest executable when you link with @code{-static}. - -On Linux, you will get the fastest code when compiling with @code{pgcc} -and @code{-O3}. To compile @file{sql_yacc.cc} with these options, you -need about 200M memory because @code{gcc/pgcc} needs a lot of memory to -make all functions inline. You should also set @code{CXX=gcc} when -configuring MySQL to avoid inclusion of the @code{libstdc++} -library (it is not needed). Note that with some versions of @code{pgcc}, -the resulting code will only run on true Pentium processors, even if you -use the compiler option that you want the resulting code to be working on -all x586 type processors (like AMD). - -By just using a better compiler and/or better compiler options you can -get a 10-30% speed increase in your application. This is particularly -important if you compile the SQL server yourself! - -We have tested both the Cygnus CodeFusion and Fujitsu compilers, but -when we tested them, neither was sufficiently bug free to allow -MySQL to be compiled with optimisations on. - -When you compile MySQL you should only include support for the -character sets that you are going to use. (Option @code{--with-charset=xxx}.) -The standard MySQL binary distributions are compiled with support -for all character sets. - -Here is a list of some measurements that we have done: -@itemize @bullet -@item -If you use @code{pgcc} and compile everything with @code{-O6}, the -@code{mysqld} server is 1% faster than with @code{gcc} 2.95.2. - -@item -If you link dynamically (without @code{-static}), the result is 13% -slower on Linux. Note that you still can use a dynamic linked -MySQL library. It is only the server that is critical for -performance. - -@item -If you strip your @code{mysqld} binary with @code{strip libexec/mysqld}, -the resulting binary can be up to 4% faster. - -@item -If you connect using TCP/IP rather than Unix sockets, the result is 7.5% -slower on the same computer. (If you are connection to @code{localhost}, -MySQL will, by default, use sockets.) - -@item -If you connect using TCP/IP from another computer over a 100M Ethernet, -things will be 8-11% slower. - -@item -When running our benchmark tests using secure connections (all data -encrypted with internal SSL support) things were 55% slower. - -@item -If you compile with @code{--with-debug=full}, then you will lose 20% -for most queries, but some queries may take substantially longer (The -MySQL benchmarks ran 35% slower) -If you use @code{--with-debug}, then you will only lose 15%. -By starting a @code{mysqld} version compiled with @code{--with-debug=full} -with @code{--skip-safemalloc} the end result should be close to when -configuring with @code{--with-debug}. - -@item -On a Sun SPARCstation 20, SunPro C++ 4.2 is 5% faster than @code{gcc} 2.95.2. - -@item -Compiling with @code{gcc} 2.95.2 for UltraSPARC with the option -@code{-mcpu=v8 -Wa,-xarch=v8plusa} gives 4% more performance. - -@item -On Solaris 2.5.1, MIT-pthreads is 8-12% slower than Solaris native -threads on a single processor. With more load/CPUs the difference should -get bigger. - -@item -Running with @code{--log-bin} makes MySQL 1% slower. - -@item -Compiling on Linux-x86 using gcc without frame pointers -@code{-fomit-frame-pointer} or @code{-fomit-frame-pointer -ffixed-ebp} -makes @code{mysqld} 1-4% faster. -@end itemize - -The MySQL-Linux distribution provided by MySQL AB used -to be compiled with @code{pgcc}, but we had to go back to regular gcc -because of a bug in @code{pgcc} that would generate the code that does -not run on AMD. We will continue using gcc until that bug is resolved. -In the meantime, if you have a non-AMD machine, you can get a faster -binary by compiling with @code{pgcc}. The standard MySQL -Linux binary is linked statically to get it faster and more portable. - - -@node Memory use, DNS, Compile and link options, Optimising the Server -@subsection How MySQL Uses Memory - -@cindex memory use - -The following list indicates some of the ways that the @code{mysqld} server -uses memory. Where applicable, the name of the server variable relevant -to the memory use is given: - -@itemize @bullet -@item -The key buffer (variable @code{key_buffer_size}) is shared by all -threads; other buffers used by the server are allocated as -needed. @xref{Server parameters}. - -@item -Each connection uses some thread-specific space: A stack (default 64K, -variable @code{thread_stack}), a connection buffer (variable -@code{net_buffer_length}), and a result buffer (variable -@code{net_buffer_length}). The connection buffer and result buffer are -dynamically enlarged up to @code{max_allowed_packet} when needed. When -a query is running, a copy of the current query string is also allocated. - -@item -All threads share the same base memory. - -@item -Only the compressed @code{ISAM} / @code{MyISAM} tables are memory mapped. This -is because the 32-bit memory space of 4GB is not large enough for most -big tables. When systems with a 64-bit address space become more -common we may add general support for memory mapping. - -@item -Each request doing a sequential scan over a table allocates a read buffer -(variable @code{record_buffer}). - -@item -When reading rows in 'random' order (for example after a sort) a -random-read buffer is allocated to avoid disk seeks. -(variable @code{record_rnd_buffer}). - -@item -All joins are done in one pass, and most joins can be done without even -using a temporary table. Most temporary tables are memory-based (@code{HEAP}) -tables. Temporary tables with a big record length (calculated as the -sum of all column lengths) or that contain @code{BLOB} columns are -stored on disk. - -One problem in MySQL versions before Version 3.23.2 is that if a @code{HEAP} -table exceeds the size of @code{tmp_table_size}, you get the error @code{The -table tbl_name is full}. In newer versions this is handled by -automatically changing the in-memory (@code{HEAP}) table to a disk-based -(@code{MyISAM}) table as necessary. To work around this problem, you can -increase the temporary table size by setting the @code{tmp_table_size} -option to @code{mysqld}, or by setting the SQL option -@code{BIG_TABLES} in the client program. @xref{SET OPTION, , -@code{SET} Syntax}. In MySQL Version 3.20, the maximum size of the -temporary table was @code{record_buffer*16}, so if you are using this -version, you have to increase the value of @code{record_buffer}. You can -also start @code{mysqld} with the @code{--big-tables} option to always -store temporary tables on disk. However, this will affect the speed of -many complicated queries. - -@item -Most requests doing a sort allocates a sort buffer and 0-2 temporary -files depending on the result set size. @xref{Temporary files}. - -@item -Almost all parsing and calculating is done in a local memory store. No -memory overhead is needed for small items and the normal slow memory -allocation and freeing is avoided. Memory is allocated only for -unexpectedly large strings (this is done with @code{malloc()} and -@code{free()}). - -@item -Each index file is opened once and the datafile is opened once for each -concurrently running thread. For each concurrent thread, a table structure, -column structures for each column, and a buffer of size @code{3 * n} is -allocated (where @code{n} is the maximum row length, not counting @code{BLOB} -columns). A @code{BLOB} uses 5 to 8 bytes plus the length of the @code{BLOB} -data. The @code{ISAM}/@code{MyISAM} table handlers will use one extra row -buffer for internal usage. - -@item -For each table having @code{BLOB} columns, a buffer is enlarged dynamically -to read in larger @code{BLOB} values. If you scan a table, a buffer as large -as the largest @code{BLOB} value is allocated. - -@item -Table handlers for all in-use tables are saved in a cache and managed as a -FIFO. Normally the cache has 64 entries. If a table has been used by two -running threads at the same time, the cache contains two entries for the -table. @xref{Table cache}. - -@item -A @code{mysqladmin flush-tables} command closes all tables that are not in -use and marks all in-use tables to be closed when the currently executing -thread finishes. This will effectively free most in-use memory. -@end itemize - -@code{ps} and other system status programs may report that @code{mysqld} -uses a lot of memory. This may be caused by thread-stacks on different -memory addresses. For example, the Solaris version of @code{ps} counts -the unused memory between stacks as used memory. You can verify this by -checking available swap with @code{swap -s}. We have tested -@code{mysqld} with commercial memory-leakage detectors, so there should -be no memory leaks. - - -@node DNS, SET OPTION, Memory use, Optimising the Server -@subsection How MySQL uses DNS - -@cindex DNS -@cindex hostname caching - -When a new thread connects to @code{mysqld}, @code{mysqld} will span a -new thread to handle the request. This thread will first check if the -hostname is in the hostname cache. If not the thread will call -@code{gethostbyaddr_r()} and @code{gethostbyname_r()} to resolve the -hostname. - -If the operating system doesn't support the above thread-safe calls, the -thread will lock a mutex and call @code{gethostbyaddr()} and -@code{gethostbyname()} instead. Note that in this case no other thread -can resolve other hostnames that is not in the hostname cache until the -first thread is ready. - -You can disable DNS host lookup by starting @code{mysqld} with -@code{--skip-name-resolve}. In this case you can however only use IP -names in the MySQL privilege tables. - -If you have a very slow DNS and many hosts, you can get more performance by -either disabling DNS lookop with @code{--skip-name-resolve} or by -increasing the @code{HOST_CACHE_SIZE} define (default: 128) and recompile -@code{mysqld}. - -You can disable the hostname cache with @code{--skip-host-cache}. You -can clear the hostname cache with @code{FLUSH HOSTS} or @code{mysqladmin -flush-hosts}. - -If you don't want to allow connections over @code{TCP/IP}, you can do this -by starting @code{mysqld} with @code{--skip-networking}. - - -@node SET OPTION, , DNS, Optimising the Server -@subsection @code{SET} Syntax - -@findex SET OPTION - -@example -SET [GLOBAL | SESSION] sql_variable=expression, [[GLOBAL | SESSION] sql_variable=expression...] -@end example - -@code{SET} sets various options that affect the operation of the -server or your client. - -The following examples shows the different syntaxes one can use to set -variables: - -In old MySQL versions we allowed the use of the @code{SET OPTION} syntax, -but this syntax is now deprecated. - -In MySQL 4.0.3 we added the @code{GLOBAL} and @code{SESSION} options -and access to most important startup variables. - -@code{LOCAL} can be used as a synonym for @code{SESSION}. - -If you set several variables on the same command line, the last used -@code{GLOBAL | SESSION} mode is used. - -@example -SET sort_buffer_size=10000; -SET @@@@local.sort_buffer_size=10000; -SET GLOBAL sort_buffer_size=1000000, SESSION sort_buffer_size=1000000; -SET @@@@sort_buffer_size=1000000; -SET @@@@global.sort_buffer_size=1000000, @@@@local.sort_buffer_size=1000000; -@end example - -The @code{@@@@variable_name} syntax is supported to make MySQL syntax -compatible with some other databases. - -The different system variables one can set are described in the system -variable section of this manual. @xref{System Variables}. - -If you are using @code{SESSION} (the default) the option you set remains -in effect until the current session ends, or until you set the option to -a different value. If you use @code{GLOBAL}, which require the -@code{SUPER} privilege, the option is remembered and used for new -connections until the server restarts. If you want to make an option -permanent, you should set it in one of the MySQL option -files. @xref{Option files}. - -To avoid wrong usage MySQL will give an error if you use @code{SET -GLOBAL} with a variable that can only be used with @code{SET SESSION} or if -you are not using @code{SET GLOBAL} with a global variable. - -If you want to set a @code{SESSION} variable to the @code{GLOBAL} value or a -@code{GLOBAL} value to the MySQL default value, you can set it to -@code{DEFAULT}. - -@example -SET max_join_size=DEFAULT; -@end example - -This is identical to: - -@example -SET @@@@session.max_join_size=@@@@global.max_join_size; -@end example - -If you want to restrict the maximum value a startup option can be set to -with the @code{SET} command, you can specify this by using the -@code{--maximum-variable-name} command line option. @xref{Command-line -options}. - -You can get a list of most variables with @code{SHOW VARIABLES}. -@xref{SHOW VARIABLES}. You can get the value for a specific value with -the @code{@@@@[global.|local.]variable_name} syntax: -@example -SHOW VARIABLES like "max_join_size"; -SHOW GLOBAL VARIABLES like "max_join_size"; -SELECT @@@@max_join_size, @@@@global.max_join_size; -@end example - -Here follows a description of the variables that uses a the variables -that uses a non-standard @code{SET} syntax and some of the other -variables. The other variable definitions can be found in the system -variable section, among the startup options or in the description of -@code{SHOW VARIABLES}. @xref{System Variables}. @xref{Command-line -options}. @xref{SHOW VARIABLES}. - -@table @code -@item CHARACTER SET character_set_name | DEFAULT -This maps all strings from and to the client with the given mapping. -Currently the only option for @code{character_set_name} is -@code{cp1251_koi8}, but you can easily add new mappings by editing the -@file{sql/convert.cc} file in the MySQL source distribution. The -default mapping can be restored by using a @code{character_set_name} value of -@code{DEFAULT}. - -Note that the syntax for setting the @code{CHARACTER SET} option differs -from the syntax for setting the other options. - -@item PASSWORD = PASSWORD('some password') -@cindex passwords, setting -Set the password for the current user. Any non-anonymous user can change his -own password! - -@item PASSWORD FOR user = PASSWORD('some password') -Set the password for a specific user on the current server host. Only a user -with access to the @code{mysql} database can do this. The user should be -given in @code{user@@hostname} format, where @code{user} and @code{hostname} -are exactly as they are listed in the @code{User} and @code{Host} columns of -the @code{mysql.user} table entry. For example, if you had an entry with -@code{User} and @code{Host} fields of @code{'bob'} and @code{'%.loc.gov'}, -you would write: - -@example -mysql> SET PASSWORD FOR bob@@"%.loc.gov" = PASSWORD("newpass"); -@end example - -Which is equivalent to: - -@example -mysql> UPDATE mysql.user SET password=PASSWORD("newpass") - -> WHERE user="bob' AND host="%.loc.gov"; -@end example - -@item SQL_AUTO_IS_NULL = 0 | 1 -If set to @code{1} (default) then one can find the last inserted row -for a table with an @code{AUTO_INCREMENT} column with the following construct: -@code{WHERE auto_increment_column IS NULL}. This is used by some -ODBC programs like Access. - -@item AUTOCOMMIT= 0 | 1 -If set to @code{1} all changes to a table will be done at once. To start -a multi-command transaction, you have to use the @code{BEGIN} -statement. @xref{COMMIT}. If set to @code{0} you have to use @code{COMMIT} / -@code{ROLLBACK} to accept/revoke that transaction. @xref{COMMIT}. Note -that when you change from not @code{AUTOCOMMIT} mode to -@code{AUTOCOMMIT} mode, MySQL will do an automatic -@code{COMMIT} on any open transactions. - -@item BIG_TABLES = 0 | 1 -@cindex table is full -If set to @code{1}, all temporary tables are stored on disk rather than in -memory. This will be a little slower, but you will not get the error -@code{The table tbl_name is full} for big @code{SELECT} operations that -require a large temporary table. The default value for a new connection is -@code{0} (that is, use in-memory temporary tables). -This option was before named @code{SQL_BIG_TABLES}. - -@item SQL_BIG_SELECTS = 0 | 1 -If set to @code{0}, MySQL will abort if a @code{SELECT} is attempted -that probably will take a very long time. This is useful when an inadvisable -@code{WHERE} statement has been issued. A big query is defined as a -@code{SELECT} that probably will have to examine more than -@code{max_join_size} rows. The default value for a new connection is -@code{1} (which will allow all @code{SELECT} statements). - -@item SQL_BUFFER_RESULT = 0 | 1 -@code{SQL_BUFFER_RESULT} will force the result from @code{SELECT}s -to be put into a temporary table. This will help MySQL free the -table locks early and will help in cases where it takes a long time to -send the result set to the client. - -@item LOW_PRIORITY_UPDATES = 0 | 1 -If set to @code{1}, all @code{INSERT}, @code{UPDATE}, @code{DELETE}, and -and @code{LOCK TABLE WRITE} statements wait until there is no pending -@code{SELECT} or @code{LOCK TABLE READ} on the affected table. -This option was before named @code{SQL_LOW_PRIORITY_UPDATES}. - -@item MAX_JOIN_SIZE = value | DEFAULT -Don't allow @code{SELECT}s that will probably need to examine more than -@code{value} row combinations. By setting this value, you can catch -@code{SELECT}s where keys are not used properly and that would probably -take a long time. Setting this to a value other than @code{DEFAULT} will reset -the @code{SQL_BIG_SELECTS} flag. If you set the @code{SQL_BIG_SELECTS} -flag again, the @code{SQL_MAX_JOIN_SIZE} variable will be ignored. -You can set a default value for this variable by starting @code{mysqld} with -@code{-O max_join_size=#}. -This option was before named @code{SQL_MAX_JOIN_SIZE}. - -Note that if the result of the query is already in the query cache, the -above check will not be made. Instead, MySQL will send the result to the -client. Since the query result is already computed and it will not burden -the server to send the result to the client. - -@item QUERY_CACHE_TYPE = OFF | ON | DEMAND -@item QUERY_CACHE_TYPE = 0 | 1 | 2 -Set query cache setting for this thread. -@multitable @columnfractions .20 .70 -@item @strong{Option} @tab @strong{Description} -@item 0 or OFF @tab Don't cache or retrieve results. -@item 1 or ON @tab Cache all results except @code{SELECT SQL_NO_CACHE ...} queries. -@item 2 or DEMAND @tab Cache only @code{SELECT SQL_CACHE ...} queries. -@end multitable - -@item SQL_SAFE_UPDATES = 0 | 1 -If set to @code{1}, MySQL will abort if an @code{UPDATE} or -@code{DELETE} is attempted that doesn't use a key or @code{LIMIT} in the -@code{WHERE} clause. This makes it possible to catch wrong updates -when creating SQL commands by hand. - -@item SQL_SELECT_LIMIT = value | DEFAULT -The maximum number of records to return from @code{SELECT} statements. If -a @code{SELECT} has a @code{LIMIT} clause, the @code{LIMIT} takes precedence -over the value of @code{SQL_SELECT_LIMIT}. The default value for a new -connection is ``unlimited.'' If you have changed the limit, the default value -can be restored by using a @code{SQL_SELECT_LIMIT} value of @code{DEFAULT}. - -@item SQL_LOG_OFF = 0 | 1 -If set to @code{1}, no logging will be done to the standard log for this -client, if the client has the @code{SUPER} privilege. This does not -affect the update log! - -@item SQL_LOG_UPDATE = 0 | 1 -If set to @code{0}, no logging will be done to the update log for the client, -if the client has the @code{SUPER} privilege. This does not affect the -standard log! - -@item SQL_QUOTE_SHOW_CREATE = 0 | 1 -If set to @code{1}, @code{SHOW CREATE TABLE} will quote -table and column names. This is @strong{on} by default, -for replication of tables with fancy column names to work. -@ref{SHOW CREATE TABLE, , @code{SHOW CREATE TABLE}}. - -@item TIMESTAMP = timestamp_value | DEFAULT -Set the time for this client. This is used to get the original timestamp if -you use the update log to restore rows. @code{timestamp_value} should be a -Unix epoch timestamp, not a MySQL timestamp. - -@item LAST_INSERT_ID = # -Set the value to be returned from @code{LAST_INSERT_ID()}. This is stored in -the update log when you use @code{LAST_INSERT_ID()} in a command that updates -a table. - -@item INSERT_ID = # -Set the value to be used by the following @code{INSERT} or @code{ALTER TABLE} -command when inserting an @code{AUTO_INCREMENT} value. This is mainly used -with the update log. -@end table - -@node Disk issues, , Optimising the Server, MySQL Optimisation -@section Disk Issues - -@cindex disk issues -@cindex performance, disk issues - -@itemize @bullet -@item -As mentioned before, disks seeks are a big performance bottleneck. This -problems gets more and more apparent when the data starts to grow so -large that effective caching becomes impossible. For large databases, -where you access data more or less randomly, you can be sure that you -will need at least one disk seek to read and a couple of disk seeks to -write things. To minimise this problem, use disks with low seek times. - -@item -Increase the number of available disk spindles (and thereby reduce -the seek overhead) by either symlink files to different disks or striping -the disks. - -@table @strong -@item Using symbolic links -This means that you symlink the index and/or datafile(s) from the -normal data directory to another disk (that may also be striped). This -makes both the seek and read times better (if the disks are not used for -other things). @xref{Symbolic links}. - -@cindex striping, defined -@item Striping -Striping means that you have many disks and put the first block on the -first disk, the second block on the second disk, and the Nth on the -(N mod number_of_disks) disk, and so on. This means if your normal data -size is less than the stripe size (or perfectly aligned) you will get -much better performance. Note that striping is very dependent on the OS -and stripe-size. So benchmark your application with different -stripe-sizes. @xref{Custom Benchmarks}. - -Note that the speed difference for striping is @strong{very} dependent -on the parameters. Depending on how you set the striping parameters and -number of disks you may get a difference in orders of magnitude. Note that -you have to choose to optimise for random or sequential access. -@end table - -@item -For reliability you may want to use RAID 0+1 (striping + mirroring), but -in this case you will need 2*N drives to hold N drives of data. This is -probably the best option if you have the money for it! You may, however, -also have to invest in some volume-management software to handle it -efficiently. - -@item -A good option is to have semi-important data (that can be regenerated) -on RAID 0 disk while storing really important data (like host information -and logs) on a RAID 0+1 or RAID N disk. RAID N can be a problem if you -have many writes because of the time to update the parity bits. - -@item -You may also set the parameters for the filesystem that the database -uses. One easy change is to mount the filesystem with the noatime -option. That makes it skip the updating of the last access time in the -inode and by this will avoid some disk seeks. - -@item -On Linux, you can get much more performance (up to 100% under load is -not uncommon) by using @code{hdparm} to configure your disk's interface! The -following should be quite good @code{hdparm} options for MySQL (and -probably many other applications): - -@example -hdparm -m 16 -d 1 -@end example - -Note that the performance/reliability when using the above depends on -your hardware, so we strongly suggest that you test your system -thoroughly after using @code{hdparm}! Please consult the @code{hdparm} -man page for more information! If @code{hdparm} is not used wisely, -filesystem corruption may result. Backup everything before experimenting! - -@item -On many operating systems you can mount the disks with the @code{-o async} -option to set the filesystem to be updated asynchronously. If your computer is -reasonably stable, this should give you more performance without sacrificing -too much reliability. (This flag is on by default on Linux.) - -@item -If you don't need to know when a file was last accessed (which is not -really useful on a database server), you can mount your filesystems -with the @code{-o noatime} option. -@end itemize - -@menu -* Symbolic links:: Using Symbolic Links -@end menu - - -@node Symbolic links, , Disk issues, Disk issues -@subsection Using Symbolic Links - -@cindex symbolic links -@cindex links, symbolic - -You can move tables and databases from the database directory to other -locations and replace them with symbolic links to the new locations. -You might want to do this, for example, to move a database to a file -system with more free space or increase the speed of your system by -spreading your tables to different disk. - -The recommended way to do this, is to just symlink databases to a -different disk and only symlink tables as a last resort. - -@menu -* Symbolic links to databases:: Using Symbolic Links for Databases -* Symbolic links to tables:: Using Symbolic Links for Tables -@end menu - - -@node Symbolic links to databases, Symbolic links to tables, Symbolic links, Symbolic links -@subsubsection Using Symbolic Links for Databases - -@cindex databases, symbolic links - -The way to symlink a database is to first create a directory on some -disk where you have free space and then create a symlink to it from -the MySQL database directory. - -@example -shell> mkdir /dr1/databases/test -shell> ln -s /dr1/databases/test mysqld-datadir -@end example - -MySQL doesn't support that you link one directory to multiple -databases. Replacing a database directory with a symbolic link will -work fine as long as you don't make a symbolic link between databases. -Suppose you have a database @code{db1} under the MySQL data -directory, and then make a symlink @code{db2} that points to @code{db1}: - -@example -shell> cd /path/to/datadir -shell> ln -s db1 db2 -@end example - -Now, for any table @code{tbl_a} in @code{db1}, there also appears to be -a table @code{tbl_a} in @code{db2}. If one thread updates @code{db1.tbl_a} -and another thread updates @code{db2.tbl_a}, there will be problems. - -If you really need this, you must change the following code in -@file{mysys/mf_format.c}: - -@example -if (flag & 32 || (!lstat(to,&stat_buff) && S_ISLNK(stat_buff.st_mode))) -@end example - -to - -@example -if (1) -@end example - -On Windows you can use internal symbolic links to directories by compiling -MySQL with @code{-DUSE_SYMDIR}. This allows you to put different -databases on different disks. @xref{Windows symbolic links}. - - -@node Symbolic links to tables, , Symbolic links to databases, Symbolic links -@subsubsection Using Symbolic Links for Tables - -@cindex tables, symbolic links - -Before MySQL 4.0 you should not symlink tables, if you are not -very careful with them. The problem is that if you run @code{ALTER -TABLE}, @code{REPAIR TABLE} or @code{OPTIMIZE TABLE} on a symlinked -table, the symlinks will be removed and replaced by the original -files. This happens because the above command works by creating a -temporary file in the database directory and when the command is -complete, replace the original file with the temporary file. - -You should not symlink tables on systems that don't have a fully -working @code{realpath()} call. (At least Linux and Solaris support -@code{realpath()}) - -In MySQL 4.0 symlinks are fully supported only for @code{MyISAM} -tables. For other table types you will probably get strange problems -when doing any of the above mentioned commands. - -The handling of symbolic links in MySQL 4.0 works the following -way (this is mostly relevant only for @code{MyISAM} tables). - -@itemize @bullet -@item -In the data directory you will always have the table definition file -and the data and index files. - -@item -You can symlink the index file and the data file to different directories -independently of the other. - -@item -The symlinking can be done from the operating system (if @code{mysqld} is -not running) or with the @code{INDEX/DATA DIRECTORY="path-to-dir"} command -in @code{CREATE TABLE}. @xref{CREATE TABLE}. - -@item -@code{myisamchk} will not replace a symlink with the data or index file but -work directly on the file the symlink points to. Any temporary files -will be created in the same directory where the data or index file is -located. - -@item -When you drop a table that is using symlinks, both the symlink and the -file the symlink points to are dropped. This is a good reason to why you -should @strong{not} run @code{mysqld} as @code{root} or allow -persons to have write access to the MySQL database directories. - -@item -If you rename a table with @code{ALTER TABLE RENAME} and you don't move -the table to another database, the symlinks in the database directory -will be renamed to the new names and the data and index files will be -renamed accordingly. - -@item -If you use @code{ALTER TABLE RENAME} to move a table to another database, -the table will be moved to the other database directory and the old -symlinks and the files they pointed to will be deleted. (In other words, -the new table will not be symlinked.) - -@item -If you are not using symlinks, you should use the @code{--skip-symlink} -option to @code{mysqld} to ensure that no one can drop or rename a file -outside of the @code{mysqld} data directory. -@end itemize - -Things that are not yet supported: - -@cindex TODO, symlinks -@itemize @bullet -@item -@code{ALTER TABLE} ignores all @code{INDEX/DATA DIRECTORY="path"} options. -@item -@code{CREATE TABLE} doesn't report if the table has symbolic links. -@item -@code{mysqldump} doesn't include the symbolic link information in the output. -@item -@code{BACKUP TABLE} and @code{RESTORE TABLE} don't respect symbolic links. -@end itemize - - -@node Reference, Table types, MySQL Optimisation, Top -@chapter MySQL Language Reference - -MySQL has a very complex, but intuitive and easy to learn SQL -interface. This chapter describes the various commands, types, and functions -you will need to know in order to use MySQL efficiently and -effectively. This chapter also serves as a reference to all functionality -included in MySQL. In order to use this chapter effectively, you -may find it useful to refer to the various indexes. - -@menu -* Language Structure:: Language Structure -* Column types:: Column types -* Functions:: Functions -* Data Manipulation:: Data Manipulation: @code{SELECT}, @code{INSERT}, @code{UPDATE}, @code{DELETE} -* Data Definition:: Data Definition: @code{CREATE}, @code{DROP}, @code{ALTER} -* Basic User Commands:: Basic MySQL User Utility Commands -* Transactional Commands:: MySQL Transactional and Locking Commands -* Fulltext Search:: MySQL Full-text Search -* Query Cache:: MySQL Query Cache -@end menu - - -@node Language Structure, Column types, Reference, Reference -@section Language Structure - -@menu -* Literals:: Literals: How to Write Strings and Numbers -* Legal names:: Database, Table, Index, Column, and Alias Names -* Name case sensitivity:: Case-Sensitivity in Names -* Variables:: User Variables -* System Variables:: System Variables -* Comments:: Comment Syntax -* Reserved words:: Is MySQL Picky About Reserved Words? -@end menu - - -@node Literals, Legal names, Language Structure, Language Structure -@subsection Literals: How to Write Strings and Numbers - -@cindex strings, defined -@cindex strings, escaping characters -@cindex literals -@cindex escape characters -@cindex backslash, escape character - -@menu -* String syntax:: Strings -* Number syntax:: Numbers -* Hexadecimal values:: Hexadecimal values -* NULL values:: @code{NULL} values -@end menu - - -This section describes the various ways to write strings and numbers in -MySQL. It also covers the various nuances and ``gotchas'' that -you may run into when dealing with these basic types in MySQL. - - -@node String syntax, Number syntax, Literals, Literals -@subsubsection Strings - -A string is a sequence of characters, surrounded by either single quote -(@samp{'}) or double quote (@samp{"}) characters (only the single quote -if you run in ANSI mode). Examples: - -@example -'a string' -"another string" -@end example - -Within a string, certain sequences have special meaning. Each of these -sequences begins with a backslash (@samp{\}), known as the @emph{escape -character}. MySQL recognises the following escape sequences: - -@c these aren't really functions, but that's probably the most reasonable index -@table @code -@findex \0 (ASCII 0) -@findex NUL -@item \0 -An ASCII 0 (@code{NUL}) character. - -@findex \' (single quote) -@findex single quote (\') -@item \' -A single quote (@samp{'}) character. - -@findex \" (double quote) -@findex double quote (\") -@item \" -A double quote (@samp{"}) character. - -@findex \b (backspace) -@findex backspace (\b) -@item \b -A backspace character. - -@findex \n (newline) -@findex newline (\n) -@item \n -A newline character. - -@findex \r (carriage return) -@findex return (\r) -@findex carriage return (\r) -@item \r -A carriage return character. - -@findex \t (tab) -@findex tab (\t) -@item \t -A tab character. - -@findex \z (Control-Z) ASCII(26) -@findex (Control-Z) \z -@item \z -ASCII(26) (Control-Z). This character can be encoded to allow you to -work around the problem that ASCII(26) stands for END-OF-FILE on Windows. -(ASCII(26) will cause problems if you try to use -@code{mysql database < filename}.) - -@findex \\ (escape) -@findex escape (\\) -@item \\ -A backslash (@samp{\}) character. - -@findex % (wildcard character) -@findex Wildcard character (%) -@item \% -A @samp{%} character. This is used to search for literal instances of -@samp{%} in contexts where @samp{%} would otherwise be interpreted -as a wildcard character. @xref{String comparison functions}. - -@findex _ (wildcard character) -@findex Wildcard character (_) -@item \_ -A @samp{_} character. This is used to search for literal instances of -@samp{_} in contexts where @samp{_} would otherwise be interpreted -as a wildcard character. @xref{String comparison functions}. -@end table - -Note that if you use @samp{\%} or @samp{\_} in some string contexts, these -will return the strings @samp{\%} and @samp{\_} and not @samp{%} and -@samp{_}. - -@cindex quotes, in strings -@noindent -There are several ways to include quotes within a string: - -@itemize @bullet -@item -A @samp{'} inside a string quoted with @samp{'} may be written as @samp{''}. - -@item -A @samp{"} inside a string quoted with @samp{"} may be written as @samp{""}. - -@item -You can precede the quote character with an escape character (@samp{\}). - -@item -A @samp{'} inside a string quoted with @samp{"} needs no special treatment -and need not be doubled or escaped. In the same way, @samp{"} inside a -string quoted with @samp{'} needs no special treatment. -@end itemize - -The @code{SELECT} statements shown here demonstrate how quoting and -escaping work: - -@example -mysql> SELECT 'hello', '"hello"', '""hello""', 'hel''lo', '\'hello'; -+-------+---------+-----------+--------+--------+ -| hello | "hello" | ""hello"" | hel'lo | 'hello | -+-------+---------+-----------+--------+--------+ - -mysql> SELECT "hello", "'hello'", "''hello''", "hel""lo", "\"hello"; -+-------+---------+-----------+--------+--------+ -| hello | 'hello' | ''hello'' | hel"lo | "hello | -+-------+---------+-----------+--------+--------+ - -mysql> SELECT "This\nIs\nFour\nlines"; -+--------------------+ -| This -Is -Four -lines | -+--------------------+ -@end example - -@cindex quoting binary data - -If you want to insert binary data into a string column (such as a -@code{BLOB}), the following characters must be represented by escape -sequences: -@table @code -@item NUL -ASCII 0. You should represent this by @samp{\0} (a backslash and an ASCII @samp{0} character). -@item \ -ASCII 92, backslash. Represent this by @samp{\\}. -@item ' -ASCII 39, single quote. Represent this by @samp{\'}. -@item " -ASCII 34, double quote. Represent this by @samp{\"}. -@end table - -@cindex quoting -@cindex @code{BLOB}, inserting binary data -@findex mysql_real_escape_string() -@findex DBI->quote -If you write C code, you can use the C API function -@code{mysql_real_escape_string()} to escape characters for the @code{INSERT} -statement. @xref{C API function overview}. In Perl, you can use the -@code{quote} method of the @code{DBI} package to convert special -characters to the proper escape sequences. @xref{Perl DBI Class, , Perl -@code{DBI} Class}. - -You should use an escape function on any string that might contain any of the -special characters listed above! - -Alternatively, many MySQL APIs provide some sort of placeholder capability -that allows you to insert special markers into a query string, and then bind -data values to them when you issue the query. In this case, the API takes -case of escaping special characters in the values for you automatically. - - -@node Number syntax, Hexadecimal values, String syntax, Literals -@subsubsection Numbers - -@cindex numbers -@cindex valid numbers, examples -@cindex integers -@cindex floats -@cindex negative values - -Integers are represented as a sequence of digits. Floats use @samp{.} as a -decimal separator. Either type of number may be preceded by @samp{-} to -indicate a negative value. - -Examples of valid integers: - -@example -1221 -0 --32 -@end example - -Examples of valid floating-point numbers: - -@example -294.42 --32032.6809e+10 -148.00 -@end example - -An integer may be used in a floating-point context; it is interpreted -as the equivalent floating-point number. - - -@node Hexadecimal values, NULL values, Number syntax, Literals -@subsubsection Hexadecimal Values - -@tindex hexadecimal values - -MySQL supports hexadecimal values. In numeric context these act -like an integer (64-bit precision). In string context these act like a binary -string where each pair of hex digits is converted to a character: - -@example -mysql> SELECT x'4D7953514C'; - -> MySQL -mysql> SELECT 0xa+0; - -> 10 -mysql> SELECT 0x5061756c; - -> Paul -@end example - -The @code{x'hexstring'} syntax (new in 4.0) is based on ANSI SQL and the -@code{0x} syntax is based on ODBC. Hexadecimal strings are often used by -ODBC to supply values for @code{BLOB} columns. -You can convert a string or a number to hexadecimal with the @code{HEX()} -function. - -@node NULL values, , Hexadecimal values, Literals -@subsubsection @code{NULL} Values - -@tindex NULL value - -The @code{NULL} value means ``no data'' and is different from values such -as @code{0} for numeric types or the empty string for string types. -@xref{Problems with NULL, , Problems with @code{NULL}}. - -@code{NULL} may be represented by @code{\N} when using the text file import -or export formats (@code{LOAD DATA INFILE}, @code{SELECT ... INTO OUTFILE}). -@xref{LOAD DATA, , @code{LOAD DATA}}. - - -@node Legal names, Name case sensitivity, Literals, Language Structure -@subsection Database, Table, Index, Column, and Alias Names - -@cindex names -@cindex legal names -@cindex databases, names -@cindex tables, names -@cindex indexes, names -@cindex columns, names -@cindex aliases, names - -Database, table, index, column, and alias names all follow the same rules in -MySQL. - -@tindex identifiers, quoting -@tindex quoting of identifiers -@tindex ` -@tindex " -Note that the rules changed starting with MySQL Version 3.23.6 when we -introduced quoting of identifiers (database, table, and column names) -with @samp{`}. @samp{"} will also work to quote identifiers if you run -in ANSI mode. @xref{ANSI mode}. - -@multitable @columnfractions .15 .15 .70 -@item @strong{Identifier} @tab @strong{Max length} @tab @strong{Allowed characters} -@item Database @tab 64 @tab Any character that is allowed in a directory name except @samp{/}, @samp{\} or @samp{.}. -@item Table @tab 64 @tab Any character that is allowed in a file name, except @samp{/} or @samp{.}. -@item Column @tab 64 @tab All characters. -@item Alias @tab 255 @tab All characters. -@end multitable - -Note that in addition to the above, you can't have ASCII(0) or ASCII(255) or -the quoting character in an identifier. - -Note that if the identifier is a restricted word or contains special characters -you must always quote it with a @code{`} (backtick) when you use it: - -@example -mysql> SELECT * FROM `select` WHERE `select`.id > 100; -@end example - -@xref{Reserved words}. - -In MySQL versions prior to 3.23.6, the name rules are as follows: - -@itemize @bullet -@item -A name may consist of alphanumeric characters from the current character set -and also @samp{_} and @samp{$}. The default character set is ISO-8859-1 -Latin1; this may be changed with the @code{--default-character-set} option -to @code{mysqld}. -@xref{Character sets}. - -@item -A name may start with any character that is legal in a name. In particular, -a name may start with a digit (this differs from many other database -systems!). However, a name cannot consist @emph{only} of digits. - -@item -You cannot use the @samp{.} character in names because it is used to extend the -format by which you can refer to columns (see immediately below). -@end itemize - -It is recommended that you do not use names like @code{1e}, because -an expression like @code{1e+1} is ambiguous. It may be interpreted as the -expression @code{1e + 1} or as the number @code{1e+1}. - -In MySQL you can refer to a column using any of the following forms: - -@multitable @columnfractions .30 .70 -@item @strong{Column reference} @tab @strong{Meaning} -@item @code{col_name} @tab Column @code{col_name} -from whichever table used in the query contains a column of that name. -@item @code{tbl_name.col_name} @tab Column @code{col_name} from table -@code{tbl_name} of the current database. -@item @code{db_name.tbl_name.col_name} @tab Column @code{col_name} from table -@code{tbl_name} of the database @code{db_name}. This form is available in -MySQL Version 3.22 or later. -@item -@code{`column_name`} @tab A column that is a keyword or contains special characters. -@end multitable - -You need not specify a @code{tbl_name} or @code{db_name.tbl_name} prefix for -a column reference in a statement unless the reference would be ambiguous. -For example, suppose tables @code{t1} and @code{t2} each contain a column -@code{c}, and you retrieve @code{c} in a @code{SELECT} statement that uses -both @code{t1} and @code{t2}. In this case, @code{c} is ambiguous because it -is not unique among the tables used in the statement, so you must indicate -which table you mean by writing @code{t1.c} or @code{t2.c}. Similarly, if -you are retrieving from a table @code{t} in database @code{db1} and from a -table @code{t} in database @code{db2}, you must refer to columns in those -tables as @code{db1.t.col_name} and @code{db2.t.col_name}. - -@cindex ODBC compatibility -@cindex compatibility, with ODBC -The syntax @code{.tbl_name} means the table @code{tbl_name} in the current -database. This syntax is accepted for ODBC compatibility, because some ODBC -programs prefix table names with a @samp{.} character. - - -@node Name case sensitivity, Variables, Legal names, Language Structure -@subsection Case Sensitivity in Names - -@cindex names, case-sensitivity -@cindex case-sensitivity, in names -@cindex database names, case-sensitivity -@cindex table names, case-sensitivity -@cindex column names, case-sensitivity -@cindex alias names, case-sensitivity - -In MySQL, databases and tables correspond to directories and files -within those directories. Consequently, the case-sensitivity of the -underlying operating system determines the case-sensitivity of database and -table names. This means database and table names are case-insensitive in -Windows, and case-sensitive in most varieties of Unix (Mac OS X being an -exception). -@xref{Extensions to ANSI}. - -@strong{Note}: although database and table names are case-insensitive for -Windows, you should not refer to a given database or table using different -cases within the same query. The following query would not work because it -refers to a table both as @code{my_table} and as @code{MY_TABLE}: - -@example -mysql> SELECT * FROM my_table WHERE MY_TABLE.col=1; -@end example - -Column names and column aliases are case-insensitive in all cases. - -Aliases on tables are case-sensitive. The following query would not work -because it refers to the alias both as @code{a} and as @code{A}: - -@example -mysql> SELECT col_name FROM tbl_name AS a - -> WHERE a.col_name = 1 OR A.col_name = 2; -@end example - -If you have trouble remembering the lettercase for database and table names, -adopt a consistent convention, such as always creating databases and -tables using lowercase names. - -One way to avoid this problem is to start @code{mysqld} with @code{-O -lower_case_table_names=1}. By default this option is 1 on Windows and 0 on -Unix. - -If @code{lower_case_table_names} is 1 MySQL will convert all -table names to lowercase on storage and lookup. -(From version 4.0.2, this option also applies to database names.) -Note that if you change this option, you need to first convert your old -table names to lower case before starting @code{mysqld}. - -If you move @code{MyISAM} files from a Windows to a *nix disk, you may -in some cases need to use the @file{mysql_fix_extensions} tool to fix-up -the case of the file extensions in each specified database directory -(lowercase @file{.frm}, uppercase @file{.MYI} and @file{.MYD}). -@file{mysql_fix_extensions} can be found in the @file{script} subdirectory. - - -@node Variables, System Variables, Name case sensitivity, Language Structure -@subsection User Variables - -@cindex variables, user -@cindex user variables -@cindex names, variables - -MySQL supports connection-specific user variables with the -@code{@@variablename} syntax. A variable name may consist of -alphanumeric characters from the current character set and also -@samp{_}, @samp{$}, and @samp{.} . The default character set is -ISO-8859-1 Latin1; this may be changed with the -@code{--default-character-set} option to @code{mysqld}. @xref{Character -sets}. - -Variables don't have to be initialised. They contain @code{NULL} by default -and can store an integer, real, or string value. All variables for -a thread are automatically freed when the thread exits. - -You can set a variable with the @code{SET} syntax: - -@example -SET @@variable= @{ integer expression | real expression | string expression @} -[,@@variable= ...]. -@end example - -You can also assign a value to a variable in statements other than @code{SET}. -However, in this case the assignment operator is @code{:=} rather than -@code{=}, because @code{=} is reserved for comparisons in non-@code{SET} -statements: - -@example -mysql> SELECT @@t1:=(@@t2:=1)+@@t3:=4,@@t1,@@t2,@@t3; -+----------------------+------+------+------+ -| @@t1:=(@@t2:=1)+@@t3:=4 | @@t1 | @@t2 | @@t3 | -+----------------------+------+------+------+ -| 5 | 5 | 1 | 4 | -+----------------------+------+------+------+ -@end example - -User variables may be used where expressions are allowed. Note that -this does not currently include contexts where a number is explicitly -required, such as in the @code{LIMIT} clause of a @code{SELECT} statement, -or the @code{IGNORE number LINES} clause of a @code{LOAD DATA} statement. - -@strong{Note}: in a @code{SELECT} statement, each expression is evaluated -only when it's sent to the client. This means that in the @code{HAVING}, -@code{GROUP BY}, or @code{ORDER BY} clause, you can't refer to an expression -that involves variables that are set in the @code{SELECT} part. For example, -the following statement will NOT work as expected: - -@example -mysql> SELECT (@@aa:=id) AS a, (@@aa+3) AS b FROM table_name HAVING b=5; -@end example - -The reason is that @code{@@aa} will not contain the value of the current -row, but the value of @code{id} for the previous accepted row. - -@node System Variables, Comments, Variables, Language Structure -@subsection System Variables - -@cindex variables, System -@cindex system variables - -Starting from MySQL 4.0.3 we provide better access to a lot of system -and connection variables. One can change most of them without having to take -down the server. - -There are two kind of system variables: Thread-specific (or -connection-specific) -variables that are unique to the current connection and global variables -that are used to configure global events. -Global variables also are used to set up the initial values of the -corresponding thread-specific variables for new connections. - -When @code{mysqld} starts, all global variables are initialised from command -line arguments and option files. You can change the value with the -@code{SET GLOBAL} command. When a new thread is created, the thread-specific -variables are initialised from the global variables and they -will not change even if you issue a new @code{SET GLOBAL} command. - -To set the value for a @code{GLOBAL} variable, you should use one -of the following syntaxes: -(Here we use @code{sort_buffer_size} as an example variable) - -@example -SET GLOBAL sort_buffer_size=value; -SET @@@@global.sort_buffer_size=value; -@end example - -To set the value for a @code{SESSION} variable, you can use one of the -following syntaxes: - -@example -SET SESSION sort_buffer_size=value; -SET @@@@session.sort_buffer_size=value; -SET sort_buffer_size=value; -@end example - -If you don't specify @code{GLOBAL} or @code{SESSION} then @code{SESSION} -is used. @xref{SET OPTION}. - -@code{LOCAL} is a synonym for @code{SESSION}. - -To retrieve the value for a @code{GLOBAL} variable you can use one of the -following commands: - -@example -SELECT @@@@global.sort_buffer_size; -SHOW GLOBAL VARIABLES like 'sort_buffer_size'; -@end example - -To retrieve the value for a @code{SESSION} variable you can use one of the -following commands: - -@example -SELECT @@@@session.sort_buffer_size; -SHOW SESSION VARIABLES like 'sort_buffer_size'; -@end example - -When you @strong{retrieve} a variable value with the -@code{@@@@variable_name} syntax and you don't specify @code{GLOBAL} or -@code{SESSION} then MySQL will return the thread-specific -(@code{SESSION}) value if it exists. If not, MySQL will return the -global value. - -The reason for requiring @code{GLOBAL} for setting @code{GLOBAL} only -variables but not for retrieving them is to ensure that we don't later -run into problems if we later would introduce a thread-specific variable -with the same name or remove a thread-specific variable. In this case, -you could accidentally change the state for the server as a whole, rather than -just for your own connection. - -The following is a full list of all variables that you change and retrieve -and if you can use @code{GLOBAL} or @code{SESSION} with them. - -@multitable @columnfractions .50 .25 .25 -@item @strong{Variable name} @tab @strong{Value type} @tab @strong{Type} -@item autocommit @tab bool @tab SESSION -@item big_tables @tab bool @tab SESSION -@item binlog_cache_size @tab num @tab GLOBAL -@item bulk_insert_buffer_size @tab num @tab GLOBAL | SESSION -@item concurrent_insert @tab bool @tab GLOBAL -@item connect_timeout @tab num @tab GLOBAL -@item convert_character_set @tab string @tab SESSION -@item delay_key_write @tab OFF | ON | ALL @tab GLOBAL -@item delayed_insert_limit @tab num @tab GLOBAL -@item delayed_insert_timeout @tab num @tab GLOBAL -@item delayed_queue_size @tab num @tab GLOBAL -@item error_count @tab num @tab LOCAL -@item flush @tab bool @tab GLOBAL -@item flush_time @tab num @tab GLOBAL -@item foreign_key_checks @tab bool @tab SESSION -@item identity @tab num @tab SESSION -@item insert_id @tab bool @tab SESSION -@item interactive_timeout @tab num @tab GLOBAL | SESSION -@item join_buffer_size @tab num @tab GLOBAL | SESSION -@item key_buffer_size @tab num @tab GLOBAL -@item last_insert_id @tab bool @tab SESSION -@item local_infile @tab bool @tab GLOBAL -@item log_warnings @tab bool @tab GLOBAL -@item long_query_time @tab num @tab GLOBAL | SESSION -@item low_priority_updates @tab bool @tab GLOBAL | SESSION -@item max_allowed_packet @tab num @tab GLOBAL | SESSION -@item max_binlog_cache_size @tab num @tab GLOBAL -@item max_binlog_size @tab num @tab GLOBAL -@item max_connect_errors @tab num @tab GLOBAL -@item max_connections @tab num @tab GLOBAL -@item max_error_count @tab num @tab GLOBAL | SESSION -@item max_delayed_threads @tab num @tab GLOBAL -@item max_heap_table_size @tab num @tab GLOBAL | SESSION -@item max_join_size @tab num @tab GLOBAL | SESSION -@item max_sort_length @tab num @tab GLOBAL | SESSION -@item max_tmp_tables @tab num @tab GLOBAL -@item max_user_connections @tab num @tab GLOBAL -@item max_write_lock_count @tab num @tab GLOBAL -@item myisam_max_extra_sort_file_size @tab num @tab GLOBAL | SESSION -@item myisam_max_sort_file_size @tab num @tab GLOBAL | SESSION -@item myisam_sort_buffer_size @tab num @tab GLOBAL | SESSION -@item net_buffer_length @tab num @tab GLOBAL | SESSION -@item net_read_timeout @tab num @tab GLOBAL | SESSION -@item net_retry_count @tab num @tab GLOBAL | SESSION -@item net_write_timeout @tab num @tab GLOBAL | SESSION -@item query_cache_limit @tab num @tab GLOBAL -@item query_cache_size @tab num @tab GLOBAL -@item query_cache_type @tab enum @tab GLOBAL -@item read_buffer_size @tab num @tab GLOBAL | SESSION -@item read_rnd_buffer_size @tab num @tab GLOBAL | SESSION -@item rpl_recovery_rank @tab num @tab GLOBAL -@item server_id @tab num @tab GLOBAL -@item slave_compressed_protocol @tab bool @tab GLOBAL -@item slave_net_timeout @tab num @tab GLOBAL -@item slow_launch_time @tab num @tab GLOBAL -@item sort_buffer_size @tab num @tab GLOBAL | SESSION -@item sql_auto_is_null @tab bool @tab SESSION -@item sql_big_selects @tab bool @tab SESSION -@item sql_big_tables @tab bool @tab SESSION -@item sql_buffer_result @tab bool @tab SESSION -@item sql_log_binlog @tab bool @tab SESSION -@item sql_log_off @tab bool @tab SESSION -@item sql_log_update @tab bool @tab SESSION -@item sql_low_priority_updates @tab bool @tab GLOBAL | SESSION -@item sql_max_join_size @tab num @tab GLOBAL | SESSION -@item sql_quote_show_create @tab bool @tab SESSION -@item sql_safe_updates @tab bool @tab SESSION -@item sql_select_limit @tab bool @tab SESSION -@item sql_slave_skip_counter @tab num @tab GLOBAL -@item sql_warnings @tab bool @tab SESSION -@item table_cache @tab num @tab GLOBAL -@item table_type @tab enum @tab GLOBAL | SESSION -@item thread_cache_size @tab num @tab GLOBAL -@item timestamp @tab bool @tab SESSION -@item tmp_table_size @tab enum @tab GLOBAL | SESSION -@item tx_isolation @tab enum @tab GLOBAL | SESSION -@item version @tab string @tab GLOBAL -@item wait_timeout @tab num @tab GLOBAL | SESSION -@item warning_count @tab num @tab LOCAL -@item unique_checks @tab bool @tab SESSION -@end multitable - -Variables that are marked with @code{num} can be given a numerical -value. Variables that are marked with @code{bool} can be set to 0, 1, -@code{ON} or @code{OFF}. Variables that are of type @code{enum} should -normally be set to one of the available values for the variable, but can -also be set to the number that correspond to the enum value. (The first -enum value is 0). - -Here is a description of some of the variables: - -@multitable @columnfractions 0.30 0.70 -@item @strong{Variable} @tab @strong{Description} -@item identity @tab Alias for last_insert_id (Sybase compatiblity) -@item sql_low_priority_updates @tab Alias for low_priority_updates -@item sql_max_join_size @tab Alias for max_join_size -@item delay_key_write_for_all_tables @tab If this and delay_key_write are set, then all new MyISAM tables that are opened will use delayed key writes. -@item version @tab Alias for VERSION() (Sybase (?) compatability) -@end multitable - -A description of the other variable definitions can be found in the -startup options section, the description of @code{SHOW VARIABLES} and in -the @code{SET} section. @xref{Command-line -options}. @xref{SHOW VARIABLES}. @xref{SET OPTION}. - - -@node Comments, Reserved words, System Variables, Language Structure -@subsection Comment Syntax - -@findex Comment syntax - -@cindex comments, adding - -The MySQL server supports the @code{# to end of line}, @code{-- -to end of line} and @code{/* in-line or multiple-line */} comment -styles: - -@example -mysql> SELECT 1+1; # This comment continues to the end of line -mysql> SELECT 1+1; -- This comment continues to the end of line -mysql> SELECT 1 /* this is an in-line comment */ + 1; -mysql> SELECT 1+ -/* -this is a -multiple-line comment -*/ -1; -@end example - -Note that the @code{--} (double-dash) comment style requires you to have at -least one space after the second dash! - -Although the server understands the comment syntax just described, -there are some limitations on the way that the @code{mysql} client -parses @code{/* ... */} comments: - -@itemize @bullet -@item -Single-quote and double-quote characters are taken to indicate the beginning -of a quoted string, even within a comment. If the quote is not matched by a -second quote within the comment, the parser doesn't realise the comment has -ended. If you are running @code{mysql} interactively, you can tell that it -has gotten confused like this because the prompt changes from @code{mysql>} -to @code{'>} or @code{">}. - -@item -A semicolon is taken to indicate the end of the current SQL statement -and anything following it to indicate the beginning of the next statement. -@end itemize - -These limitations apply both when you run @code{mysql} interactively -and when you put commands in a file and tell @code{mysql} to read its -input from that file with @code{mysql < some-file}. - -MySQL supports the @samp{--} ANSI SQL comment style only if the second dash -is followed by a space. @xref{ANSI diff comments}. - - -@node Reserved words, , Comments, Language Structure -@subsection Is MySQL Picky About Reserved Words? - -@cindex keywords -@cindex reserved words, exceptions - -A common problem stems from trying to create a table with column names that -use the names of datatypes or functions built into MySQL, such as -@code{TIMESTAMP} or @code{GROUP}. You're allowed to do it (for example, -@code{ABS} is an allowed column name), but whitespace is not allowed between -a function name and the immediately following @samp{(} when using functions -whose names are also column names. - -The following words are explicitly reserved in MySQL. Most of -them are forbidden by ANSI SQL92 as column and/or table names -(for example, @code{GROUP}). -A few are reserved because MySQL needs them and is -(currently) using a @code{yacc} parser: - -@c START_OF_RESERVED_WORDS - -@c Reserved word list updated Tue Oct 8 13:03:34 2002 by arjen. -@c To regenerate, use Support/update-reserved-words.pl. - -@multitable @columnfractions .33 .33 .34 -@item @strong{Word} - @tab @strong{Word} - @tab @strong{Word} -@item @code{ADD} - @tab @code{ALL} - @tab @code{ALTER} -@item @code{ANALYZE} - @tab @code{AND} - @tab @code{AS} -@item @code{ASC} - @tab @code{AUTO_INCREMENT} - @tab @code{BDB} -@item @code{BERKELEYDB} - @tab @code{BETWEEN} - @tab @code{BIGINT} -@item @code{BINARY} - @tab @code{BLOB} - @tab @code{BOTH} -@item @code{BTREE} - @tab @code{BY} - @tab @code{CASCADE} -@item @code{CASE} - @tab @code{CHANGE} - @tab @code{CHAR} -@item @code{CHARACTER} - @tab @code{COLLATE} - @tab @code{COLUMN} -@item @code{COLUMNS} - @tab @code{CONSTRAINT} - @tab @code{CREATE} -@item @code{CROSS} - @tab @code{CURRENT_DATE} - @tab @code{CURRENT_TIME} -@item @code{CURRENT_TIMESTAMP} - @tab @code{DATABASE} - @tab @code{DATABASES} -@item @code{DAY_HOUR} - @tab @code{DAY_MINUTE} - @tab @code{DAY_SECOND} -@item @code{DEC} - @tab @code{DECIMAL} - @tab @code{DEFAULT} -@item @code{DELAYED} - @tab @code{DELETE} - @tab @code{DESC} -@item @code{DESCRIBE} - @tab @code{DISTINCT} - @tab @code{DISTINCTROW} -@item @code{DOUBLE} - @tab @code{DROP} - @tab @code{ELSE} -@item @code{ENCLOSED} - @tab @code{ERRORS} - @tab @code{ESCAPED} -@item @code{EXISTS} - @tab @code{EXPLAIN} - @tab @code{FIELDS} -@item @code{FLOAT} - @tab @code{FOR} - @tab @code{FOREIGN} -@item @code{FROM} - @tab @code{FULLTEXT} - @tab @code{FUNCTION} -@item @code{GEOMETRY} - @tab @code{GRANT} - @tab @code{GROUP} -@item @code{HASH} - @tab @code{HAVING} - @tab @code{HIGH_PRIORITY} -@item @code{HOUR_MINUTE} - @tab @code{HOUR_SECOND} - @tab @code{IF} -@item @code{IGNORE} - @tab @code{IN} - @tab @code{INDEX} -@item @code{INFILE} - @tab @code{INNER} - @tab @code{INNODB} -@item @code{INSERT} - @tab @code{INT} - @tab @code{INTEGER} -@item @code{INTERVAL} - @tab @code{INTO} - @tab @code{IS} -@item @code{JOIN} - @tab @code{KEY} - @tab @code{KEYS} -@item @code{KILL} - @tab @code{LEADING} - @tab @code{LEFT} -@item @code{LIKE} - @tab @code{LIMIT} - @tab @code{LINES} -@item @code{LOAD} - @tab @code{LOCK} - @tab @code{LONG} -@item @code{LONGBLOB} - @tab @code{LONGTEXT} - @tab @code{LOW_PRIORITY} -@item @code{MASTER_SERVER_ID} - @tab @code{MATCH} - @tab @code{MEDIUMBLOB} -@item @code{MEDIUMINT} - @tab @code{MEDIUMTEXT} - @tab @code{MIDDLEINT} -@item @code{MINUTE_SECOND} - @tab @code{MRG_MYISAM} - @tab @code{NATURAL} -@item @code{NOT} - @tab @code{NULL} - @tab @code{NUMERIC} -@item @code{ON} - @tab @code{OPTIMIZE} - @tab @code{OPTION} -@item @code{OPTIONALLY} - @tab @code{OR} - @tab @code{ORDER} -@item @code{OUTER} - @tab @code{OUTFILE} - @tab @code{PRECISION} -@item @code{PRIMARY} - @tab @code{PRIVILEGES} - @tab @code{PROCEDURE} -@item @code{PURGE} - @tab @code{READ} - @tab @code{REAL} -@item @code{REFERENCES} - @tab @code{REGEXP} - @tab @code{RENAME} -@item @code{REPLACE} - @tab @code{REQUIRE} - @tab @code{RESTRICT} -@item @code{RETURNS} - @tab @code{REVOKE} - @tab @code{RIGHT} -@item @code{RLIKE} - @tab @code{RTREE} - @tab @code{SELECT} -@item @code{SET} - @tab @code{SHOW} - @tab @code{SMALLINT} -@item @code{SONAME} - @tab @code{SPATIAL} - @tab @code{SQL_BIG_RESULT} -@item @code{SQL_CALC_FOUND_ROWS} - @tab @code{SQL_SMALL_RESULT} - @tab @code{SSL} -@item @code{STARTING} - @tab @code{STRAIGHT_JOIN} - @tab @code{STRIPED} -@item @code{TABLE} - @tab @code{TABLES} - @tab @code{TERMINATED} -@item @code{THEN} - @tab @code{TINYBLOB} - @tab @code{TINYINT} -@item @code{TINYTEXT} - @tab @code{TO} - @tab @code{TRAILING} -@item @code{TYPES} - @tab @code{UNION} - @tab @code{UNIQUE} -@item @code{UNLOCK} - @tab @code{UNSIGNED} - @tab @code{UPDATE} -@item @code{USAGE} - @tab @code{USE} - @tab @code{USER_RESOURCES} -@item @code{USING} - @tab @code{VALUES} - @tab @code{VARBINARY} -@item @code{VARCHAR} - @tab @code{VARYING} - @tab @code{WARNINGS} -@item @code{WHEN} - @tab @code{WHERE} - @tab @code{WITH} -@item @code{WRITE} - @tab @code{XOR} - @tab @code{YEAR_MONTH} -@item @code{ZEROFILL} - @tab - @tab -@end multitable - -@c END_OF_RESERVED_WORDS - -The following symbols (from the table above) are disallowed by ANSI SQL -but allowed by MySQL as column/table names. This is because some -of these names are very natural names and a lot of people have already -used them. - -@itemize @bullet -@item @code{ACTION} -@item @code{BIT} -@item @code{DATE} -@item @code{ENUM} -@item @code{NO} -@item @code{TEXT} -@item @code{TIME} -@item @code{TIMESTAMP} -@end itemize - - -@node Column types, Functions, Language Structure, Reference -@section Column Types - -@cindex columns, types -@cindex types, columns - -MySQL supports a number of column types, which may be grouped into -three categories: numeric types, date and time types, and string (character) -types. This section first gives an overview of the types available and -summarises the storage requirements for each column type, then provides a -more detailed description of the properties of the types in each category. -The overview is intentionally brief. The more detailed descriptions should -be consulted for additional information about particular column types, such -as the allowable formats in which you can specify values. - -The column types supported by MySQL are listed below. -The following code letters are used in the descriptions: - -@cindex display size -@cindex sizes, display -@cindex digits -@cindex decimal point -@cindex brackets, square -@cindex square brackets -@table @code -@item M -Indicates the maximum display size. The maximum legal display size is 255. - -@item D -Applies to floating-point types and indicates the number of digits -following the decimal point. The maximum possible value is 30, but -should be no greater than @code{M}-2. -@end table - -Square brackets (@samp{[} and @samp{]}) indicate parts of type specifiers -that are optional. - -@tindex Types - -@c The @w{-number} stuff keeps a linebreak from occurring between -@c the - and number. - -Note that if you specify @code{ZEROFILL} for a column, MySQL will -automatically add the @code{UNSIGNED} attribute to the column. - -@strong{Warning}: you should be aware that when you use subtraction -between integer values where one is of type @code{UNSIGNED}, the result -will be unsigned! @xref{Cast Functions}. - -@table @code -@tindex TINYINT -@item TINYINT[(M)] [UNSIGNED] [ZEROFILL] - -A very small integer. The signed range is @code{-128} to @code{127}. The -unsigned range is @code{0} to @code{255}. - -@tindex BOOL -@tindex BIT -@item BIT -@itemx BOOL -These are synonyms for @code{TINYINT(1)}. - -@tindex SMALLINT -@item SMALLINT[(M)] [UNSIGNED] [ZEROFILL] - -A small integer. The signed range is @code{-32768} to @code{32767}. The -unsigned range is @code{0} to @code{65535}. - -@tindex MEDIUMINT -@item MEDIUMINT[(M)] [UNSIGNED] [ZEROFILL] - -A medium-size integer. The signed range is @code{-8388608} to -@code{8388607}. The unsigned range is @code{0} to @code{16777215}. - -@tindex INT -@item INT[(M)] [UNSIGNED] [ZEROFILL] - -A normal-size integer. The signed range is @code{-2147483648} to -@code{2147483647}. The unsigned range is @code{0} to @code{4294967295}. - -@tindex INTEGER -@item INTEGER[(M)] [UNSIGNED] [ZEROFILL] - -This is a synonym for @code{INT}. - -@tindex BIGINT -@item BIGINT[(M)] [UNSIGNED] [ZEROFILL] - -A large integer. The signed range is @code{-9223372036854775808} to -@code{9223372036854775807}. The unsigned range is @code{0} to -@code{18446744073709551615}. - -Some things you should be aware of with respect to @code{BIGINT} columns: - -@itemize @bullet -@item -@cindex rounding errors -All arithmetic is done using signed @code{BIGINT} or @code{DOUBLE} -values, so you shouldn't use unsigned big integers larger than -@code{9223372036854775807} (63 bits) except with bit functions! If you -do that, some of the last digits in the result may be wrong because of -rounding errors when converting the @code{BIGINT} to a @code{DOUBLE}. - -MySQL 4.0 can handle @code{BIGINT} in the following cases: -@itemize @bullet -@item -Use integers to store big unsigned values in a @code{BIGINT} column. -@item -In @code{MIN(big_int_column)} and @code{MAX(big_int_column)}. -@item -When using operators (@code{+}, @code{-}, @code{*}, etc.) where -both operands are integers. -@end itemize - -@item -You can always store an exact integer value in a @code{BIGINT} column by -storing it as a string. In this case, MySQL will perform a string-to-number -conversion that involves no intermediate double representation. -@item -@samp{-}, @samp{+}, and @samp{*} will use @code{BIGINT} arithmetic when -both arguments are integer values! This means that if you -multiply two big integers (or results from functions that return -integers) you may get unexpected results when the result is larger than -@code{9223372036854775807}. -@end itemize - -@cindex floating-point number -@tindex FLOAT -@tindex FLOAT(precision) -@item FLOAT(precision) [UNSIGNED] [ZEROFILL] - -A floating-point number. @code{precision} can be -@code{<=24} for a single-precision floating-point number and between 25 -and 53 for a double-precision floating-point number. These types are like -the @code{FLOAT} and @code{DOUBLE} types described immediately below. -@code{FLOAT(X)} has the same range as the corresponding @code{FLOAT} and -@code{DOUBLE} types, but the display size and number of decimals are undefined. - -In MySQL Version 3.23, this is a true floating-point value. In -earlier MySQL versions, @code{FLOAT(precision)} always has 2 decimals. - -Note that using @code{FLOAT} may give you some unexpected problems as -all calculations in MySQL are done with double precision. -@xref{No matching rows}. - -@cindex ODBC compatibility -@cindex compatibility, with ODBC -This syntax is provided for ODBC compatibility. - -@tindex FLOAT -@tindex FLOAT(M,D) -@item FLOAT[(M,D)] [UNSIGNED] [ZEROFILL] - -A small (single-precision) floating-point number. Allowable values are -@code{@w{-3.402823466E+38}} to @code{@w{-1.175494351E-38}}, @code{0}, -and @code{@w{1.175494351E-38}} to @code{3.402823466E+38}. If -@code{UNSIGNED} is specified, negative values are disallowed. The @code{M} -is the display width and @code{D} is the number of decimals. @code{FLOAT} -without arguments or @code{FLOAT(X)} where @code{X} <= 24 stands for a -single-precision floating-point number. - -@tindex DOUBLE -@tindex FLOAT(precision) -@item DOUBLE[(M,D)] [UNSIGNED] [ZEROFILL] - -A normal-size (double-precision) floating-point number. -Allowable values are @code{@w{-1.7976931348623157E+308}} to -@code{@w{-2.2250738585072014E-308}}, @code{0}, and -@code{2.2250738585072014E-308} to @code{1.7976931348623157E+308}. If -@code{UNSIGNED} is specified, negative values are disallowed. The -@code{M} is the display width and @code{D} is the number of decimals. -@code{DOUBLE} without arguments or @code{FLOAT(X)} where 25 <= @code{X} -<= 53 stands for a double-precision floating-point number. - -@tindex DOUBLE PRECISION -@tindex REAL -@item DOUBLE PRECISION[(M,D)] [UNSIGNED] [ZEROFILL] -@itemx REAL[(M,D)] [UNSIGNED] [ZEROFILL] - -These are synonyms for @code{DOUBLE}. - -@tindex DECIMAL -@item DECIMAL[(M[,D])] [UNSIGNED] [ZEROFILL] - -An unpacked floating-point number. Behaves like a -@code{CHAR} column: ``unpacked'' means the number is stored as a string, -using one character for each digit of the value. The decimal point and, -for negative numbers, the @samp{-} sign, are not counted in @code{M} (but -space for these is reserved). If @code{D} is 0, values will have no decimal -point or fractional part. The maximum range of @code{DECIMAL} values is -the same as for @code{DOUBLE}, but the actual range for a given -@code{DECIMAL} column may be constrained by the choice of @code{M} and -@code{D}. If @code{UNSIGNED} is specified, negative values are disallowed. - -If @code{D} is omitted, the default is 0. If @code{M} is omitted, the -default is 10. - -Prior to MySQL Version 3.23, the @code{M} argument must include the space -needed for the sign and the decimal point. - -@tindex DEC -@tindex NUMERIC -@item DEC[(M[,D])] [UNSIGNED] [ZEROFILL] -@itemx NUMERIC[(M[,D])] [UNSIGNED] [ZEROFILL] - -These are synonyms for @code{DECIMAL}. - -@tindex DATE -@item DATE - -A date. The supported range is @code{'1000-01-01'} to @code{'9999-12-31'}. -MySQL displays @code{DATE} values in @code{'YYYY-MM-DD'} format, but -allows you to assign values to @code{DATE} columns using either strings or -numbers. @xref{DATETIME}. - -@tindex DATETIME -@item DATETIME - -A date and time combination. The supported range is @code{'1000-01-01 -00:00:00'} to @code{'9999-12-31 23:59:59'}. MySQL displays -@code{DATETIME} values in @code{'YYYY-MM-DD HH:MM:SS'} format, but allows you -to assign values to @code{DATETIME} columns using either strings or numbers. -@xref{DATETIME}. - -@tindex TIMESTAMP -@item TIMESTAMP[(M)] - -A timestamp. The range is @code{'1970-01-01 00:00:00'} to sometime in the -year @code{2037}. MySQL displays @code{TIMESTAMP} values in -@code{YYYYMMDDHHMMSS}, @code{YYMMDDHHMMSS}, @code{YYYYMMDD}, or @code{YYMMDD} -format, depending on whether @code{M} is @code{14} (or missing), @code{12}, -@code{8}, or @code{6}, but allows you to assign values to @code{TIMESTAMP} -columns using either strings or numbers. A @code{TIMESTAMP} column is useful -for recording the date and time of an @code{INSERT} or @code{UPDATE} -operation because it is automatically set to the date and time of the most -recent operation if you don't give it a value yourself. You can also set it -to the current date and time by assigning it a @code{NULL} value. @xref{Date -and time types}. - -The @code{M} argument affects only how a @code{TIMESTAMP} column is displayed; -its values always are stored using 4 bytes each. - -Note that @code{TIMESTAMP(M)} columns where @code{M} is 8 or 14 are reported to -be numbers while other @code{TIMESTAMP(M)} columns are reported to be -strings. This is just to ensure that one can reliably dump and restore -the table with these types! -@xref{DATETIME, , @code{DATETIME}}. - -@tindex TIME -@item TIME - -A time. The range is @code{'-838:59:59'} to @code{'838:59:59'}. -MySQL displays @code{TIME} values in @code{'HH:MM:SS'} format, but -allows you to assign values to @code{TIME} columns using either strings or -numbers. @xref{TIME, , @code{TIME}}. - -@tindex YEAR -@item YEAR[(2|4)] - -A year in 2- or 4-digit format (default is 4-digit). The allowable values -are @code{1901} to @code{2155}, @code{0000} in the 4-digit year format, -and 1970-2069 if you use the 2-digit format (70-69). MySQL displays -@code{YEAR} values in @code{YYYY} format, but allows you to assign values to -@code{YEAR} columns using either strings or numbers. (The @code{YEAR} type is -unavailable prior to MySQL Version 3.22.) @xref{YEAR, , @code{YEAR}}. - -@tindex NATIONAL CHAR -@tindex NCHAR -@tindex CHAR -@tindex CHARACTER -@item [NATIONAL] CHAR(M) [BINARY] - -A fixed-length string that is always right-padded with spaces to the -specified length when stored. The range of @code{M} is 0 to 255 characters -(1 to 255 prior to MySQL Version 3.23). -Trailing spaces are removed when the value is retrieved. @code{CHAR} values -are sorted and compared in case-insensitive fashion according to the -default character set unless the @code{BINARY} keyword is given. - -@code{NATIONAL CHAR} (or its equivalent short form, @code{NCHAR}) is the -ANSI SQL way to define that a @code{CHAR} column should use the default -CHARACTER set. This is the default in MySQL. - -@code{CHAR} is a shorthand for @code{CHARACTER}. - -MySQL allows you to create a column of type -@code{CHAR(0)}. This is mainly useful when you have to be compliant with -some old applications that depend on the existence of a column but that do not -actually use the value. This is also quite nice when you need a -column that only can take 2 values: A @code{CHAR(0)}, that is not defined -as @code{NOT NULL}, will occupy only one bit and can take only 2 values: -@code{NULL} or @code{""}. @xref{CHAR, , @code{CHAR}}. - -@item CHAR -This is a synonym for @code{CHAR(1)}. - -@tindex CHARACTER VARYING -@tindex CHAR VARYING -@tindex VARCHAR -@item [NATIONAL] VARCHAR(M) [BINARY] - -A variable-length string. @strong{Note}: trailing spaces are removed when -the value is stored (this differs from the ANSI SQL specification). The range -of @code{M} is 0 to 255 characters (1 to 255 prior to MySQL Version 4.0.2). -@code{VARCHAR} values are sorted and compared in case-insensitive fashion -unless the @code{BINARY} keyword is given. @xref{Silent column changes}. - -@code{VARCHAR} is a shorthand for @code{CHARACTER VARYING}. -@xref{CHAR}. - -@tindex TINYBLOB -@tindex TINYTEXT -@item TINYBLOB -@itemx TINYTEXT - -A @code{BLOB} or @code{TEXT} column with a maximum length of 255 (2^8 - 1) -characters. @xref{Silent column changes}. @xref{BLOB}. - -@tindex BLOB -@tindex TEXT -@item BLOB -@itemx TEXT - -A @code{BLOB} or @code{TEXT} column with a maximum length of 65535 (2^16 - 1) -characters. @xref{Silent column changes}. @xref{BLOB}. - -@tindex MEDIUMBLOB -@tindex MEDIUMTEXT -@item MEDIUMBLOB -@itemx MEDIUMTEXT - -A @code{BLOB} or @code{TEXT} column with a maximum length of 16777215 -(2^24 - 1) characters. @xref{Silent column changes}. @xref{BLOB}. - -@tindex LONGBLOB -@tindex LONGTEXT -@item LONGBLOB -@itemx LONGTEXT - -A @code{BLOB} or @code{TEXT} column with a maximum length of 4294967295 -(2^32 - 1) characters. @xref{Silent column changes}. Note that because -the server/client protocol and MyISAM tables has currently a limit of -16M per communication packet / table row, you can't yet use this -the whole range of this type. @xref{BLOB}. - -@tindex ENUM -@item ENUM('value1','value2',...) - -An enumeration. A string object that can have only one value, chosen -from the list of values @code{'value1'}, @code{'value2'}, @code{...}, -@code{NULL} or the special @code{""} error value. An @code{ENUM} can -have a maximum of 65535 distinct values. @xref{ENUM}. - -@tindex SET -@item SET('value1','value2',...) - -A set. A string object that can have zero or more values, each of which must -be chosen from the list of values @code{'value1'}, @code{'value2'}, -@code{...} A @code{SET} can have a maximum of 64 members. @xref{SET}. -@end table - -@menu -* Numeric types:: Numeric types -* Date and time types:: Date and time types -* String types:: String types -* Choosing types:: Choosing the right type for a column -* Other-vendor column types:: Using column types from other database engines -* Storage requirements:: Column type storage requirements -@end menu - - -@node Numeric types, Date and time types, Column types, Column types -@subsection Numeric Types - -MySQL supports all of the ANSI/ISO SQL92 numeric types. These -types include the exact numeric data types (@code{NUMERIC}, -@code{DECIMAL}, @code{INTEGER}, and @code{SMALLINT}), as well as the -approximate numeric data types (@code{FLOAT}, @code{REAL}, and -@code{DOUBLE PRECISION}). The keyword @code{INT} is a synonym for -@code{INTEGER}, and the keyword @code{DEC} is a synonym for -@code{DECIMAL}. - -The @code{NUMERIC} and @code{DECIMAL} types are implemented as the same -type by MySQL, as permitted by the SQL92 standard. They are -used for values for which it is important to preserve exact precision, -for example with monetary data. When declaring a column of one of these -types the precision and scale can be (and usually is) specified; for -example: - -@example - salary DECIMAL(5,2) -@end example - -In this example, @code{5} (@code{precision}) represents the number of -significant decimal digits that will be stored for values, and @code{2} -(@code{scale}) represents the number of digits that will be stored -following the decimal point. In this case, therefore, the range of -values that can be stored in the @code{salary} column is from -@code{-99.99} to @code{99.99}. -(MySQL can actually store numbers up to @code{999.99} in this column -because it doesn't have to store the sign for positive numbers) - -In ANSI/ISO SQL92, the syntax @code{DECIMAL(p)} is equivalent to -@code{DECIMAL(p,0)}. Similarly, the syntax @code{DECIMAL} is equivalent -to @code{DECIMAL(p,0)}, where the implementation is allowed to decide -the value of @code{p}. MySQL does not currently support either of these -variant forms of the @code{DECIMAL}/@code{NUMERIC} data types. This is -not generally a serious problem, as the principal benefits of these -types derive from the ability to control both precision and scale -explicitly. - -@code{DECIMAL} and @code{NUMERIC} values are stored as strings, rather -than as binary floating-point numbers, in order to preserve the decimal -precision of those values. One character is used for each digit of the -value, the decimal point (if @code{scale} > 0), and the @samp{-} sign -(for negative numbers). If @code{scale} is 0, @code{DECIMAL} and -@code{NUMERIC} values contain no decimal point or fractional part. - -The maximum range of @code{DECIMAL} and @code{NUMERIC} values is the -same as for @code{DOUBLE}, but the actual range for a given -@code{DECIMAL} or @code{NUMERIC} column can be constrained by the -@code{precision} or @code{scale} for a given column. When such a column -is assigned a value with more digits following the decimal point than -are allowed by the specified @code{scale}, the value is rounded to that -@code{scale}. When a @code{DECIMAL} or @code{NUMERIC} column is -assigned a value whose magnitude exceeds the range implied by the -specified (or defaulted) @code{precision} and @code{scale}, -MySQL stores the value representing the corresponding end -point of that range. - -As an extension to the ANSI/ISO SQL92 standard, MySQL also -supports the integer types @code{TINYINT}, @code{MEDIUMINT}, and -@code{BIGINT} as listed in the tables above. Another extension is -supported by MySQL for optionally specifying the display width -of an integer value in parentheses following the base keyword for the -type (for example, @code{INT(4)}). This optional width specification is -used to left-pad the display of values whose width is less than the -width specified for the column, but does not constrain the range of -values that can be stored in the column, nor the number of digits that -will be displayed for values whose width exceeds that specified for the -column. When used in conjunction with the optional extension attribute -@code{ZEROFILL}, the default padding of spaces is replaced with zeroes. -For example, for a column declared as @code{INT(5) ZEROFILL}, a value -of @code{4} is retrieved as @code{00004}. Note that if you store larger -values than the display width in an integer column, you may experience -problems when MySQL generates temporary tables for some -complicated joins, as in these cases MySQL trusts that the -data did fit into the original column width. - -All integer types can have an optional (non-standard) attribute -@code{UNSIGNED}. Unsigned values can be used when you want to allow -only positive numbers in a column and you need a little bigger numeric -range for the column. - -As of MySQL 4.0.2, floating-point types also can be @code{UNSIGNED}. -As with integer types, this attribute prevents negative values from -being stored in the column. Unlike the integer types, the upper range -of column values remains the same. - -The @code{FLOAT} type is used to represent approximate numeric data -types. The ANSI/ISO SQL92 standard allows an optional specification of -the precision (but not the range of the exponent) in bits following the -keyword @code{FLOAT} in parentheses. The MySQL implementation -also supports this optional precision specification. When the keyword -@code{FLOAT} is used for a column type without a precision -specification, MySQL uses four bytes to store the values. A -variant syntax is also supported, with two numbers given in parentheses -following the @code{FLOAT} keyword. With this option, the first number -continues to represent the storage requirements for the value in bytes, -and the second number specifies the number of digits to be stored and -displayed following the decimal point (as with @code{DECIMAL} and -@code{NUMERIC}). When MySQL is asked to store a number for -such a column with more decimal digits following the decimal point than -specified for the column, the value is rounded to eliminate the extra -digits when the value is stored. - -The @code{REAL} and @code{DOUBLE PRECISION} types do not accept -precision specifications. As an extension to the ANSI/ISO SQL92 -standard, MySQL recognises @code{DOUBLE} as a synonym for the -@code{DOUBLE PRECISION} type. In contrast with the standard's -requirement that the precision for @code{REAL} be smaller than that used -for @code{DOUBLE PRECISION}, MySQL implements both as 8-byte -double-precision floating-point values (when not running in ``ANSI mode''). -For maximum portability, code requiring storage of approximate numeric -data values should use @code{FLOAT} or @code{DOUBLE PRECISION} with no -specification of precision or number of decimal points. - -When asked to store a value in a numeric column that is outside the column -type's allowable range, MySQL clips the value to the appropriate -endpoint of the range and stores the resulting value instead. - -For example, the range of an @code{INT} column is @code{-2147483648} to -@code{2147483647}. If you try to insert @code{-9999999999} into an -@code{INT} column, the value is clipped to the lower endpoint of the range, -and @code{-2147483648} is stored instead. Similarly, if you try to insert -@code{9999999999}, @code{2147483647} is stored instead. - -If the @code{INT} column is @code{UNSIGNED}, the size of the column's -range is the same but its endpoints shift up to @code{0} and @code{4294967295}. -If you try to store @code{-9999999999} and @code{9999999999}, -the values stored in the column become @code{0} and @code{4294967296}. - -Conversions that occur due to clipping are reported as ``warnings'' for -@code{ALTER TABLE}, @code{LOAD DATA INFILE}, @code{UPDATE}, and -multi-row @code{INSERT} statements. - -@c FIX arjen 2002-08-07 New table, not yet measured for O'Reilly/DocBook -@c FIX also need to shuffle into proper position and adjust text. -@multitable @columnfractions .20 .20 .30 .30 -@item @strong{Type} @tab @strong{Bytes} @tab @strong{From} @tab @strong{To} -@item @code{TINYINT} @tab 1 @tab -128 @tab 127 -@item @code{SMALLINT} @tab 2 @tab -32768 @tab 32767 -@item @code{MEDIUMINT} @tab 3 @tab -8388608 @tab 8388607 -@item @code{INT} @tab 4 @tab -2147483648 @tab 2147483647 -@item @code{BIGINT} @tab 8 @tab -9223372036854775808 @tab 9223372036854775807 -@end multitable - - -@node Date and time types, String types, Numeric types, Column types -@subsection Date and Time Types - -@cindex types, Date and Time -@cindex Date and Time types - -@menu -* Y2K issues:: Y2K issues and date types -* DATETIME:: The @code{DATETIME}, @code{DATE} and @code{TIMESTAMP} types -* TIME:: The @code{TIME} type -* YEAR:: The @code{YEAR} type -@end menu - - -The date and time types are @code{DATETIME}, @code{DATE}, -@code{TIMESTAMP}, @code{TIME}, and @code{YEAR}. Each of these has a -range of legal values, as well as a ``zero'' value that is used when you -specify a really illegal value. Note that MySQL allows you to store -certain 'not strictly' legal date values, for example @code{1999-11-31}. -The reason for this is that we think it's the responsibility of the -application to handle date checking, not the SQL servers. To make the -date checking 'fast', MySQL only checks that the month is in -the range of 0-12 and the day is in the range of 0-31. The above ranges -are defined this way because MySQL allows you to store, in a -@code{DATE} or @code{DATETIME} column, dates where the day or month-day -is zero. This is extremely useful for applications that need to store -a birth-date for which you don't know the exact date. In this case you -simply store the date like @code{1999-00-00} or @code{1999-01-00}. (You -cannot expect to get a correct value from functions like @code{DATE_SUB()} -or @code{DATE_ADD} for dates like these.) - -Here are some general considerations to keep in mind when working -with date and time types: - -@itemize @bullet -@item -MySQL retrieves values for a given date or time type in a standard -format, but it attempts to interpret a variety of formats for values that -you supply (for example, when you specify a value to be assigned to or -compared to a date or time type). Nevertheless, only the formats described -in the following sections are supported. It is expected that you will supply -legal values, and unpredictable results may occur if you use values in other -formats. - -@item -Although MySQL tries to interpret values in several formats, it -always expects the year part of date values to be leftmost. Dates must be -given in year-month-day order (for example, @code{'98-09-04'}), rather than -in the month-day-year or day-month-year orders commonly used elsewhere (for -example, @code{'09-04-98'}, @code{'04-09-98'}). - -@item -MySQL automatically converts a date or time type value to a number -if the value is used in a numeric context, and vice versa. - -@item -When MySQL encounters a value for a date or time type that is -out of range or otherwise illegal for the type (see the start of this -section), it converts the value to the ``zero'' value for that type. -(The exception is that out-of-range @code{TIME} values are clipped to -the appropriate endpoint of the @code{TIME} range.) The following table -shows the format of the ``zero'' value for each type: - -@multitable @columnfractions .15 .55 -@item @strong{Column type} @tab @strong{``Zero'' value} -@item @code{DATETIME} @tab @code{'0000-00-00 00:00:00'} -@item @code{DATE} @tab @code{'0000-00-00'} -@item @code{TIMESTAMP} @tab @code{00000000000000} (length depends on display size) -@item @code{TIME} @tab @code{'00:00:00'} -@item @code{YEAR} @tab @code{0000} -@end multitable - -@item -The ``zero'' values are special, but you can store or refer to them -explicitly using the values shown in the table. You can also do this -using the values @code{'0'} or @code{0}, which are easier to write. - -@item -``Zero'' date or time values used through @code{MyODBC} are converted -automatically to @code{NULL} in @code{MyODBC} Version 2.50.12 and above, -because ODBC can't handle such values. -@end itemize - - -@node Y2K issues, DATETIME, Date and time types, Date and time types -@subsubsection Y2K Issues and Date Types - -@cindex Year 2000 issues -@cindex date types, Y2K issues - -MySQL itself is Y2K-safe (@pxref{Year 2000 compliance}), -but input values presented to MySQL may not be. Any input -containing 2-digit year values is ambiguous, because the century is unknown. -Such values must be interpreted into 4-digit form because MySQL stores -years internally using four digits. - -For @code{DATETIME}, @code{DATE}, @code{TIMESTAMP}, and @code{YEAR} types, -MySQL interprets dates with ambiguous year values using the -following rules: - -@itemize @bullet -@item -Year values in the range @code{00-69} are converted to @code{2000-2069}. - -@item -Year values in the range @code{70-99} are converted to @code{1970-1999}. -@end itemize - -Remember that these rules provide only reasonable guesses as to what your -data mean. If the heuristics used by MySQL don't produce the -correct values, you should provide unambiguous input containing 4-digit -year values. - -@code{ORDER BY} will sort 2-digit @code{YEAR/DATE/DATETIME} types properly. - -Note also that some functions like @code{MIN()} and @code{MAX()} will convert a -@code{TIMESTAMP/DATE} to a number. This means that a timestamp with a -2-digit year will not work properly with these functions. The fix in this -case is to convert the @code{TIMESTAMP/DATE} to 4-digit year format or -use something like @code{MIN(DATE_ADD(timestamp,INTERVAL 0 DAYS))}. - - -@node DATETIME, TIME, Y2K issues, Date and time types -@subsubsection The @code{DATETIME}, @code{DATE}, and @code{TIMESTAMP} Types - -@tindex DATETIME -@tindex DATE -@tindex TIMESTAMP - -The @code{DATETIME}, @code{DATE}, and @code{TIMESTAMP} types are related. -This section describes their characteristics, how they are similar, and how -they differ. - -The @code{DATETIME} type is used when you need values that contain both date -and time information. MySQL retrieves and displays @code{DATETIME} -values in @code{'YYYY-MM-DD HH:MM:SS'} format. The supported range is -@code{'1000-01-01 00:00:00'} to @code{'9999-12-31 23:59:59'}. (``Supported'' -means that although earlier values might work, there is no guarantee that -they will.) - -The @code{DATE} type is used when you need only a date value, without a time -part. MySQL retrieves and displays @code{DATE} values in -@code{'YYYY-MM-DD'} format. The supported range is @code{'1000-01-01'} to -@code{'9999-12-31'}. - -The @code{TIMESTAMP} column type provides a type that you can use to -automatically mark @code{INSERT} or @code{UPDATE} operations with the current -date and time. If you have multiple @code{TIMESTAMP} columns, only the first -one is updated automatically. - -Automatic updating of the first @code{TIMESTAMP} column occurs under any of -the following conditions: - -@itemize @bullet -@item -The column is not specified explicitly in an @code{INSERT} or -@code{LOAD DATA INFILE} statement. -@item -The column is not specified explicitly in an @code{UPDATE} statement and some -other column changes value. (Note that an @code{UPDATE} that sets a column -to the value it already has will not cause the @code{TIMESTAMP} column to be -updated, because if you set a column to its current value, MySQL -ignores the update for efficiency.) -@item -You explicitly set the @code{TIMESTAMP} column to @code{NULL}. -@end itemize - -@code{TIMESTAMP} columns other than the first may also be set to the current -date and time. Just set the column to @code{NULL} or to @code{NOW()}. - -You can set any @code{TIMESTAMP} column to a value different from the current -date and time by setting it explicitly to the desired value. This is true -even for the first @code{TIMESTAMP} column. You can use this property if, -for example, you want a @code{TIMESTAMP} to be set to the current date and -time when you create a row, but not to be changed whenever the row is updated -later: - -@itemize @bullet -@item -Let MySQL set the column when the row is created. -This will initialise it to the current date and time. - -@item -When you perform subsequent updates to other columns in the row, set -the @code{TIMESTAMP} column explicitly to its current value. -@end itemize - -On the other hand, you may find it just as easy to use a @code{DATETIME} -column that you initialise to @code{NOW()} when the row is created and -leave alone for subsequent updates. - -@code{TIMESTAMP} values may range from the beginning of 1970 to sometime in -the year 2037, with a resolution of one second. Values are displayed as -numbers. - -The format in which MySQL retrieves and displays @code{TIMESTAMP} -values depends on the display size, as illustrated by the following table. The -`full' @code{TIMESTAMP} format is 14 digits, but @code{TIMESTAMP} columns may -be created with shorter display sizes: - -@multitable @columnfractions .20 .25 -@item @strong{Column type} @tab @strong{Display format} -@item @code{TIMESTAMP(14)} @tab @code{YYYYMMDDHHMMSS} -@item @code{TIMESTAMP(12)} @tab @code{YYMMDDHHMMSS} -@item @code{TIMESTAMP(10)} @tab @code{YYMMDDHHMM} -@item @code{TIMESTAMP(8)} @tab @code{YYYYMMDD} -@item @code{TIMESTAMP(6)} @tab @code{YYMMDD} -@item @code{TIMESTAMP(4)} @tab @code{YYMM} -@item @code{TIMESTAMP(2)} @tab @code{YY} -@end multitable - -All @code{TIMESTAMP} columns have the same storage size, regardless of -display size. The most common display sizes are 6, 8, 12, and 14. You can -specify an arbitrary display size at table creation time, but values of 0 or -greater than 14 are coerced to 14. Odd-valued sizes in the range from 1 to -13 are coerced to the next higher even number. - -You can specify @code{DATETIME}, @code{DATE}, and @code{TIMESTAMP} values using -any of a common set of formats: - -@itemize @bullet -@item -As a string in either @code{'YYYY-MM-DD HH:MM:SS'} or @code{'YY-MM-DD -HH:MM:SS'} format. A ``relaxed'' syntax is allowed---any punctuation -character may be used as the delimiter between date parts or time parts. -For example, @code{'98-12-31 11:30:45'}, @code{'98.12.31 11+30+45'}, -@code{'98/12/31 11*30*45'}, and @code{'98@@12@@31 11^30^45'} are -equivalent. - -@item -As a string in either @code{'YYYY-MM-DD'} or @code{'YY-MM-DD'} format. -A ``relaxed'' syntax is allowed here, too. For example, @code{'98-12-31'}, -@code{'98.12.31'}, @code{'98/12/31'}, and @code{'98@@12@@31'} are -equivalent. - -@item -As a string with no delimiters in either @code{'YYYYMMDDHHMMSS'} or -@code{'YYMMDDHHMMSS'} format, provided that the string makes sense as a -date. For example, @code{'19970523091528'} and @code{'970523091528'} are -interpreted as @code{'1997-05-23 09:15:28'}, but @code{'971122129015'} is -illegal (it has a nonsensical minute part) and becomes @code{'0000-00-00 -00:00:00'}. - -@item -As a string with no delimiters in either @code{'YYYYMMDD'} or @code{'YYMMDD'} -format, provided that the string makes sense as a date. For example, -@code{'19970523'} and @code{'970523'} are interpreted as -@code{'1997-05-23'}, but @code{'971332'} is illegal (it has nonsensical month -and day parts) and becomes @code{'0000-00-00'}. - -@item -As a number in either @code{YYYYMMDDHHMMSS} or @code{YYMMDDHHMMSS} -format, provided that the number makes sense as a date. For example, -@code{19830905132800} and @code{830905132800} are interpreted as -@code{'1983-09-05 13:28:00'}. - -@item -As a number in either @code{YYYYMMDD} or @code{YYMMDD} -format, provided that the number makes sense as a date. For example, -@code{19830905} and @code{830905} are interpreted as @code{'1983-09-05'}. - -@item -As the result of a function that returns a value that is acceptable -in a @code{DATETIME}, @code{DATE}, or @code{TIMESTAMP} context, such as -@code{NOW()} or @code{CURRENT_DATE}. -@end itemize - -Illegal @code{DATETIME}, @code{DATE}, or @code{TIMESTAMP} values are converted -to the ``zero'' value of the appropriate type (@code{'0000-00-00 00:00:00'}, -@code{'0000-00-00'}, or @code{00000000000000}). - -For values specified as strings that include date part delimiters, it is not -necessary to specify two digits for month or day values that are less than -@code{10}. @code{'1979-6-9'} is the same as @code{'1979-06-09'}. Similarly, -for values specified as strings that include time part delimiters, it is not -necessary to specify two digits for hour, minute, or second values that are -less than @code{10}. @code{'1979-10-30 1:2:3'} is the same as -@code{'1979-10-30 01:02:03'}. - -Values specified as numbers should be 6, 8, 12, or 14 digits long. If the -number is 8 or 14 digits long, it is assumed to be in @code{YYYYMMDD} or -@code{YYYYMMDDHHMMSS} format and that the year is given by the first 4 -digits. If the number is 6 or 12 digits long, it is assumed to be in -@code{YYMMDD} or @code{YYMMDDHHMMSS} format and that the year is given by the -first 2 digits. Numbers that are not one of these lengths are interpreted -as though padded with leading zeros to the closest length. - -@cindex non-delimited strings -@cindex strings, non-delimited -Values specified as non-delimited strings are interpreted using their length -as given. If the string is 8 or 14 characters long, the year is assumed to -be given by the first 4 characters. Otherwise, the year is assumed to be -given by the first 2 characters. The string is interpreted from left to -right to find year, month, day, hour, minute, and second values, for as many -parts as are present in the string. This means you should not use strings -that have fewer than 6 characters. For example, if you specify @code{'9903'}, -thinking that will represent March, 1999, you will find that MySQL -inserts a ``zero'' date into your table. This is because the year and month -values are @code{99} and @code{03}, but the day part is missing (zero), so -the value is not a legal date. - -@code{TIMESTAMP} columns store legal values using the full precision with -which the value was specified, regardless of the display size. This has -several implications: - -@itemize @bullet -@item -Always specify year, month, and day, even if your column types are -@code{TIMESTAMP(4)} or @code{TIMESTAMP(2)}. Otherwise, the value will not -be a legal date and @code{0} will be stored. - -@item -If you use @code{ALTER TABLE} to widen a narrow @code{TIMESTAMP} column, -information will be displayed that previously was ``hidden''. - -@item -Similarly, narrowing a @code{TIMESTAMP} column does not cause information to -be lost, except in the sense that less information is shown when the values -are displayed. - -@item -Although @code{TIMESTAMP} values are stored to full precision, the only -function that operates directly on the underlying stored value is -@code{UNIX_TIMESTAMP()}. Other functions operate on the formatted retrieved -value. This means you cannot use functions such as @code{HOUR()} or -@code{SECOND()} unless the relevant part of the @code{TIMESTAMP} value is -included in the formatted value. For example, the @code{HH} part of a -@code{TIMESTAMP} column is not displayed unless the display size is at least -10, so trying to use @code{HOUR()} on shorter @code{TIMESTAMP} values -produces a meaningless result. -@end itemize - -You can to some extent assign values of one date type to an object -of a different date type. However, there may be some alteration -of the value or loss of information: - -@itemize @bullet -@item -If you assign a @code{DATE} value to a @code{DATETIME} or @code{TIMESTAMP} -object, the time part of the resulting value is set to @code{'00:00:00'}, -because the @code{DATE} value contains no time information. - -@item -If you assign a @code{DATETIME} or @code{TIMESTAMP} value to a @code{DATE} -object, the time part of the resulting value is deleted, because the -@code{DATE} type stores no time information. - -@item -Remember that although @code{DATETIME}, @code{DATE}, and @code{TIMESTAMP} -values all can be specified using the same set of formats, the types do not -all have the same range of values. For example, @code{TIMESTAMP} values -cannot be earlier than @code{1970} or later than @code{2037}. This means -that a date such as @code{'1968-01-01'}, while legal as a @code{DATETIME} or -@code{DATE} value, is not a valid @code{TIMESTAMP} value and will be -converted to @code{0} if assigned to such an object. -@end itemize - -@cindex problems, date values -@cindex date values, problems -Be aware of certain pitfalls when specifying date values: - -@itemize @bullet -@item -The relaxed format allowed for values specified as strings can be deceiving. -For example, a value such as @code{'10:11:12'} might look like a time value -because of the @samp{:} delimiter, but if used in a date context will be -interpreted as the year @code{'2010-11-12'}. The value @code{'10:45:15'} -will be converted to @code{'0000-00-00'} because @code{'45'} is not a legal -month. - -@item -The MySQL server only performs basic checking on the validity of a date: -days @code{00-31}, months @code{00-12}, years @code{1000-9999}. -Any date not within this range will revert to @code{0000-00-00}. -Please note that this still allows you to store invalid dates such as -@code{2002-04-31}. It allows web applications to store data from a form -without further checking. To ensure a date is valid, perform a check in -your application. - -@item -Year values specified as two digits are ambiguous, because the century is -unknown. MySQL interprets 2-digit year values using the following -rules: - -@itemize @minus -@item -Year values in the range @code{00-69} are converted to @code{2000-2069}. - -@item -Year values in the range @code{70-99} are converted to @code{1970-1999}. -@end itemize -@end itemize - - -@node TIME, YEAR, DATETIME, Date and time types -@subsubsection The @code{TIME} Type - -@tindex TIME - -MySQL retrieves and displays @code{TIME} values in @code{'HH:MM:SS'} -format (or @code{'HHH:MM:SS'} format for large hours values). @code{TIME} -values may range from @code{'-838:59:59'} to @code{'838:59:59'}. The reason -the hours part may be so large is that the @code{TIME} type may be used not -only to represent a time of day (which must be less than 24 hours), but also -elapsed time or a time interval between two events (which may be much greater -than 24 hours, or even negative). - -You can specify @code{TIME} values in a variety of formats: - -@itemize @bullet -@item -As a string in @code{'D HH:MM:SS.fraction'} format. (Note that -MySQL doesn't yet store the fraction for the time column.) One -can also use one of the following ``relaxed'' syntax: - -@code{HH:MM:SS.fraction}, @code{HH:MM:SS}, @code{HH:MM}, @code{D HH:MM:SS}, -@code{D HH:MM}, @code{D HH} or @code{SS}. Here @code{D} is days between 0-33. - -@item -As a string with no delimiters in @code{'HHMMSS'} format, provided that -it makes sense as a time. For example, @code{'101112'} is understood as -@code{'10:11:12'}, but @code{'109712'} is illegal (it has a nonsensical -minute part) and becomes @code{'00:00:00'}. - -@item -As a number in @code{HHMMSS} format, provided that it makes sense as a time. -For example, @code{101112} is understood as @code{'10:11:12'}. The following -alternative formats are also understood: @code{SS}, @code{MMSS},@code{HHMMSS}, -@code{HHMMSS.fraction}. Note that MySQL doesn't yet store the -fraction part. - -@item -As the result of a function that returns a value that is acceptable -in a @code{TIME} context, such as @code{CURRENT_TIME}. -@end itemize - -For @code{TIME} values specified as strings that include a time part -delimiter, it is not necessary to specify two digits for hours, minutes, or -seconds values that are less than @code{10}. @code{'8:3:2'} is the same as -@code{'08:03:02'}. - -Be careful about assigning ``short'' @code{TIME} values to a @code{TIME} -column. Without colons, MySQL interprets values using the -assumption that the rightmost digits represent seconds. (MySQL -interprets @code{TIME} values as elapsed time rather than as time of -day.) For example, you might think of @code{'1112'} and @code{1112} as -meaning @code{'11:12:00'} (12 minutes after 11 o'clock), but -MySQL interprets them as @code{'00:11:12'} (11 minutes, 12 seconds). -Similarly, @code{'12'} and @code{12} are interpreted as @code{'00:00:12'}. -@code{TIME} values with colons, by contrast, are always treated as -time of the day. That is @code{'11:12'} will mean @code{'11:12:00'}, -not @code{'00:11:12'}. - -Values that lie outside the @code{TIME} range -but are otherwise legal are clipped to the appropriate -endpoint of the range. For example, @code{'-850:00:00'} and -@code{'850:00:00'} are converted to @code{'-838:59:59'} and -@code{'838:59:59'}. - -Illegal @code{TIME} values are converted to @code{'00:00:00'}. Note that -because @code{'00:00:00'} is itself a legal @code{TIME} value, there is no way -to tell, from a value of @code{'00:00:00'} stored in a table, whether the -original value was specified as @code{'00:00:00'} or whether it was illegal. - - -@node YEAR, , TIME, Date and time types -@subsubsection The @code{YEAR} Type - -@tindex YEAR - -The @code{YEAR} type is a 1-byte type used for representing years. - -MySQL retrieves and displays @code{YEAR} values in @code{YYYY} -format. The range is @code{1901} to @code{2155}. - -You can specify @code{YEAR} values in a variety of formats: - -@itemize @bullet -@item -As a four-digit string in the range @code{'1901'} to @code{'2155'}. - -@item -As a four-digit number in the range @code{1901} to @code{2155}. - -@item -As a two-digit string in the range @code{'00'} to @code{'99'}. Values in the -ranges @code{'00'} to @code{'69'} and @code{'70'} to @code{'99'} are -converted to @code{YEAR} values in the ranges @code{2000} to @code{2069} and -@code{1970} to @code{1999}. - -@item -As a two-digit number in the range @code{1} to @code{99}. Values in the -ranges @code{1} to @code{69} and @code{70} to @code{99} are converted to -@code{YEAR} values in the ranges @code{2001} to @code{2069} and @code{1970} -to @code{1999}. Note that the range for two-digit numbers is slightly -different from the range for two-digit strings, because you cannot specify zero -directly as a number and have it be interpreted as @code{2000}. You -@strong{must} specify it as a string @code{'0'} or @code{'00'} or it will be -interpreted as @code{0000}. - -@item -As the result of a function that returns a value that is acceptable -in a @code{YEAR} context, such as @code{NOW()}. -@end itemize - -Illegal @code{YEAR} values are converted to @code{0000}. - - -@node String types, Choosing types, Date and time types, Column types -@subsection String Types - -@cindex types, strings -@cindex string types - -@tindex CHAR -@tindex VARCHAR - -@menu -* CHAR:: The @code{CHAR} and @code{VARCHAR} types -* BLOB:: The @code{BLOB} and @code{TEXT} types -* ENUM:: The @code{ENUM} type -* SET:: The @code{SET} type -@end menu - - -The string types are @code{CHAR}, @code{VARCHAR}, @code{BLOB}, @code{TEXT}, -@code{ENUM}, and @code{SET}. This section describes how these types work, -their storage requirements, and how to use them in your queries. - -@c FIX arjen 2002-08-07 New table, not yet measured for O'Reilly/DocBook -@c FIX also need to shuffle into proper position and adjust text. -@multitable @columnfractions .40 .30 .30 -@item @strong{Type} @tab @strong{Max.size} @tab @strong{Bytes} -@item @code{TINYTEXT} or @code{TINYBLOB} @tab 2^8-1 @tab 255 -@item @code{TEXT} or @code{BLOB} @tab 2^16-1 (64K-1) @tab 65535 -@item @code{MEDIUMTEXT} or @code{MEDIUMBLOB} @tab 2^24-1 (16M-1) @tab 16777215 -@item @code{LONGBLOB} @tab 2^32-1 (4G-1) @tab 4294967295 -@end multitable - - -@node CHAR, BLOB, String types, String types -@subsubsection The @code{CHAR} and @code{VARCHAR} Types - -The @code{CHAR} and @code{VARCHAR} types are similar, but differ in the -way they are stored and retrieved. - -The length of a @code{CHAR} column is fixed to the length that you declare -when you create the table. The length can be any value between 1 and 255. -(As of MySQL Version 3.23, the length of @code{CHAR} may be 0 to 255.) -When @code{CHAR} values are stored, they are right-padded with spaces to the -specified length. When @code{CHAR} values are retrieved, trailing spaces are -removed. - -Values in @code{VARCHAR} columns are variable-length strings. You can -declare a @code{VARCHAR} column to be any length between 1 and 255, just as -for @code{CHAR} columns. However, in contrast to @code{CHAR}, @code{VARCHAR} -values are stored using only as many characters as are needed, plus one byte -to record the length. Values are not padded; instead, trailing spaces are -removed when values are stored. (This space removal differs from the ANSI -SQL specification.) - -If you assign a value to a @code{CHAR} or @code{VARCHAR} column that -exceeds the column's maximum length, the value is truncated to fit. - -The following table illustrates the differences between the two types of columns -by showing the result of storing various string values into @code{CHAR(4)} -and @code{VARCHAR(4)} columns: - -@c Need to use @(space) to make sure second column values retain spacing -@c in output for table below. - -@multitable @columnfractions .15 .15 .20 .15 .20 -@item @strong{Value} @tab @code{CHAR(4)} @tab @strong{Storage required} @tab @code{VARCHAR(4)} @tab @strong{Storage required} -@item @code{''} @tab @code{'@ @ @ @ '} @tab 4 bytes @tab @code{''} @tab 1 byte -@item @code{'ab'} @tab @code{'ab@ @ '} @tab 4 bytes @tab @code{'ab'} @tab 3 bytes -@item @code{'abcd'} @tab @code{'abcd'} @tab 4 bytes @tab @code{'abcd'} @tab 5 bytes -@item @code{'abcdefgh'} @tab @code{'abcd'} @tab 4 bytes @tab @code{'abcd'} @tab 5 bytes -@end multitable - -The values retrieved from the @code{CHAR(4)} and @code{VARCHAR(4)} columns -will be the same in each case, because trailing spaces are removed from -@code{CHAR} columns upon retrieval. - -Values in @code{CHAR} and @code{VARCHAR} columns are sorted and compared -in case-insensitive fashion, unless the @code{BINARY} attribute was -specified when the table was created. The @code{BINARY} attribute means -that column values are sorted and compared in case-sensitive fashion -according to the ASCII order of the machine where the MySQL -server is running. @code{BINARY} doesn't affect how the column is stored -or retrieved. - -The @code{BINARY} attribute is sticky. This means that if a column marked -@code{BINARY} is used in an expression, the whole expression is compared as a -@code{BINARY} value. - -MySQL may silently change the type of a @code{CHAR} or @code{VARCHAR} -column at table creation time. -@xref{Silent column changes}. - - -@node BLOB, ENUM, CHAR, String types -@subsubsection The @code{BLOB} and @code{TEXT} Types - -@tindex BLOB -@tindex TEXT - -A @code{BLOB} is a binary large object that can hold a variable amount of -data. The four @code{BLOB} types @code{TINYBLOB}, @code{BLOB}, -@code{MEDIUMBLOB}, and @code{LONGBLOB} differ only in the maximum length of -the values they can hold. -@xref{Storage requirements}. - -The four @code{TEXT} types @code{TINYTEXT}, @code{TEXT}, @code{MEDIUMTEXT}, -and @code{LONGTEXT} correspond to the four @code{BLOB} types and have the -same maximum lengths and storage requirements. The only difference between -@code{BLOB} and @code{TEXT} types is that sorting and comparison is performed -in case-sensitive fashion for @code{BLOB} values and case-insensitive fashion -for @code{TEXT} values. In other words, a @code{TEXT} is a case-insensitive -@code{BLOB}. - -If you assign a value to a @code{BLOB} or @code{TEXT} column that exceeds -the column type's maximum length, the value is truncated to fit. - -In most respects, you can regard a @code{TEXT} column as a @code{VARCHAR} -column that can be as big as you like. Similarly, you can regard a -@code{BLOB} column as a @code{VARCHAR BINARY} column. The differences are: - -@itemize @bullet -@item -You can have indexes on @code{BLOB} and @code{TEXT} columns with -MySQL Version 3.23.2 and newer. Older versions of -MySQL did not support this. - -@item -There is no trailing-space removal for @code{BLOB} and @code{TEXT} columns -when values are stored, as there is for @code{VARCHAR} columns. - -@item -@cindex default values, @code{BLOB} and @code{TEXT} columns -@cindex @code{BLOB} columns, default values -@cindex @code{TEXT} columns, default values -@code{BLOB} and @code{TEXT} columns cannot have @code{DEFAULT} values. -@end itemize - -@code{MyODBC} defines @code{BLOB} values as @code{LONGVARBINARY} and -@code{TEXT} values as @code{LONGVARCHAR}. - -Because @code{BLOB} and @code{TEXT} values may be extremely long, you -may run up against some constraints when using them: - -@itemize @bullet -@item -If you want to use @code{GROUP BY} or @code{ORDER BY} on a @code{BLOB} or -@code{TEXT} column, you must convert the column value into a fixed-length -object. The standard way to do this is with the @code{SUBSTRING} -function. For example: - -@example -mysql> SELECT comment FROM tbl_name,SUBSTRING(comment,20) AS substr - -> ORDER BY substr; -@end example - -If you don't do this, only the first @code{max_sort_length} bytes of the -column are used when sorting. The default value of @code{max_sort_length} is -1024; this value can be changed using the @code{-O} option when starting the -@code{mysqld} server. You can group on an expression involving @code{BLOB} or -@code{TEXT} values by specifying the column position or by using an alias: - -@example -mysql> SELECT id,SUBSTRING(blob_col,1,100) FROM tbl_name GROUP BY 2; -mysql> SELECT id,SUBSTRING(blob_col,1,100) AS b FROM tbl_name GROUP BY b; -@end example - -@item -The maximum size of a @code{BLOB} or @code{TEXT} object is determined by its -type, but the largest value you can actually transmit between the client and -server is determined by the amount of available memory and the size of the -communications buffers. You can change the message buffer size, but you must -do so on both the server and client ends. @xref{Server parameters}. -@end itemize - -Note that each @code{BLOB} or @code{TEXT} value is represented -internally by a separately allocated object. This is in contrast to all -other column types, for which storage is allocated once per column when -the table is opened. - - -@node ENUM, SET, BLOB, String types -@subsubsection The @code{ENUM} Type - -@tindex ENUM - -An @code{ENUM} is a string object whose value normally is chosen from a list -of allowed values that are enumerated explicitly in the column specification -at table creation time. - -The value may also be the empty string (@code{""}) or @code{NULL} under -certain circumstances: - -@itemize @bullet -@item -If you insert an invalid value into an @code{ENUM} (that is, a string not -present in the list of allowed values), the empty string is inserted -instead as a special error value. This string can be distinguished from a -'normal' empty string by the fact that this string has the numerical value -0. More about this later. - -@item -If an @code{ENUM} is declared @code{NULL}, @code{NULL} is also a legal value -for the column, and the default value is @code{NULL}. If an @code{ENUM} is -declared @code{NOT NULL}, the default value is the first element of the -list of allowed values. -@end itemize - -Each enumeration value has an index: - -@itemize @bullet -@item -Values from the list of allowable elements in the column specification are -numbered beginning with 1. - -@item -The index value of the empty string error value is 0. This means that you -can use the following @code{SELECT} statement to find rows into which invalid -@code{ENUM} values were assigned: - -@example -mysql> SELECT * FROM tbl_name WHERE enum_col=0; -@end example - -@item -The index of the @code{NULL} value is @code{NULL}. -@end itemize - -For example, a column specified as @code{ENUM("one", "two", "three")} can -have any of the values shown here. The index of each value is also shown: - -@multitable @columnfractions .10 .10 -@item @strong{Value} @tab @strong{Index} -@item @code{NULL} @tab @code{NULL} -@item @code{""} @tab 0 -@item @code{"one"} @tab 1 -@item @code{"two"} @tab 2 -@item @code{"three"} @tab 3 -@end multitable - -An enumeration can have a maximum of 65535 elements. - -Starting from 3.23.51 trailing spaces are automatically deleted from -@code{ENUM} values when the table is created. - -Lettercase is irrelevant when you assign values to an @code{ENUM} column. -However, values retrieved from the column later have lettercase matching the -values that were used to specify the allowable values at table creation time. - -If you retrieve an @code{ENUM} in a numeric context, the column value's -index is returned. For example, you can retrieve numeric values from -an @code{ENUM} column like this: - -@example -mysql> SELECT enum_col+0 FROM tbl_name; -@end example - -If you store a number into an @code{ENUM}, the number is treated as an -index, and the value stored is the enumeration member with that index. -(However, this will not work with @code{LOAD DATA}, which treats all -input as strings.) -It's not advisable to store numbers in an @code{ENUM} string because -it will make things confusing. - -@code{ENUM} values are sorted according to the order in which the enumeration -members were listed in the column specification. (In other words, -@code{ENUM} values are sorted according to their index numbers.) For -example, @code{"a"} sorts before @code{"b"} for @code{ENUM("a", "b")}, but -@code{"b"} sorts before @code{"a"} for @code{ENUM("b", "a")}. The empty -string sorts before non-empty strings, and @code{NULL} values sort before -all other enumeration values. - -If you want to get all possible values for an @code{ENUM} column, you should -use: @code{SHOW COLUMNS FROM table_name LIKE enum_column_name} and parse -the @code{ENUM} definition in the second column. - - -@node SET, , ENUM, String types -@subsubsection The @code{SET} Type - -@tindex SET - -A @code{SET} is a string object that can have zero or more values, each of -which must be chosen from a list of allowed values specified when the table -is created. @code{SET} column values that consist of multiple set members -are specified with members separated by commas (@samp{,}). A consequence of -this is that @code{SET} member values cannot themselves contain commas. - -For example, a column specified as @code{SET("one", "two") NOT NULL} can have -any of these values: - -@example -"" -"one" -"two" -"one,two" -@end example - - -A @code{SET} can have a maximum of 64 different members. - -Starting from 3.23.51 trailing spaces are automatically deleted from -@code{SET} values when the table is created. - -MySQL stores @code{SET} values numerically, with the low-order bit -of the stored value corresponding to the first set member. If you retrieve a -@code{SET} value in a numeric context, the value retrieved has bits set -corresponding to the set members that make up the column value. For example, -you can retrieve numeric values from a @code{SET} column like this: - -@example -mysql> SELECT set_col+0 FROM tbl_name; -@end example - -If a number is stored into a @code{SET} column, the bits that -are set in the binary representation of the number determine the -set members in the column value. Suppose a column is specified as -@code{SET("a","b","c","d")}. Then the members have the following bit -values: - -@multitable @columnfractions .15 .20 .20 -@item @code{SET} @strong{member} @tab @strong{Decimal value} @tab @strong{Binary value} -@item @code{a} @tab @code{1} @tab @code{0001} -@item @code{b} @tab @code{2} @tab @code{0010} -@item @code{c} @tab @code{4} @tab @code{0100} -@item @code{d} @tab @code{8} @tab @code{1000} -@end multitable - -If you assign a value of @code{9} to this column, that is @code{1001} in -binary, so the first and fourth @code{SET} value members @code{"a"} and -@code{"d"} are selected and the resulting value is @code{"a,d"}. - -For a value containing more than one @code{SET} element, it does not matter -what order the elements are listed in when you insert the value. It also -does not matter how many times a given element is listed in the value. -When the value is retrieved later, each element in the value will appear -once, with elements listed according to the order in which they were -specified at table creation time. For example, if a column is specified as -@code{SET("a","b","c","d")}, then @code{"a,d"}, @code{"d,a"}, and -@code{"d,a,a,d,d"} will all appear as @code{"a,d"} when retrieved. - -If you set a @code{SET} column to an unsupported value, the value will -be ignored. - -@code{SET} values are sorted numerically. @code{NULL} values sort before -non-@code{NULL} @code{SET} values. - -Normally, you perform a @code{SELECT} on a @code{SET} column using -the @code{LIKE} operator or the @code{FIND_IN_SET()} function: - -@example -mysql> SELECT * FROM tbl_name WHERE set_col LIKE '%value%'; -mysql> SELECT * FROM tbl_name WHERE FIND_IN_SET('value',set_col)>0; -@end example - -But the following will also work: - -@example -mysql> SELECT * FROM tbl_name WHERE set_col = 'val1,val2'; -mysql> SELECT * FROM tbl_name WHERE set_col & 1; -@end example - -The first of these statements looks for an exact match. The second looks -for values containing the first set member. - -If you want to get all possible values for a @code{SET} column, you should -use: @code{SHOW COLUMNS FROM table_name LIKE set_column_name} and parse -the @code{SET} definition in the second column. - - -@node Choosing types, Other-vendor column types, String types, Column types -@subsection Choosing the Right Type for a Column - -@cindex types, columns -@cindex choosing types - -For the most efficient use of storage, try to use the most precise type in -all cases. For example, if an integer column will be used for values in the -range between @code{1} and @code{99999}, @code{MEDIUMINT UNSIGNED} is the -best type. - -Accurate representation of monetary values is a common problem. In -MySQL, you should use the @code{DECIMAL} type. This is stored as -a string, so no loss of accuracy should occur. If accuracy is not -too important, the @code{DOUBLE} type may also be good enough. - -For high precision, you can always convert to a fixed-point type stored -in a @code{BIGINT}. This allows you to do all calculations with integers -and convert results back to floating-point values only when necessary. - - -@node Other-vendor column types, Storage requirements, Choosing types, Column types -@subsection Using Column Types from Other Database Engines - -@cindex types, portability -@cindex portability, types -@cindex columns, other types - -To make it easier to use code written for SQL implementations from other -vendors, MySQL maps column types as shown in the following table. These -mappings make it easier to move table definitions from other database engines -to MySQL: - -@multitable @columnfractions .25 .30 -@item @strong{Other vendor type} @tab @strong{MySQL type} -@item @code{BINARY(NUM)} @tab @code{CHAR(NUM) BINARY} -@item @code{CHAR VARYING(NUM)} @tab @code{VARCHAR(NUM)} -@item @code{FLOAT4} @tab @code{FLOAT} -@item @code{FLOAT8} @tab @code{DOUBLE} -@item @code{INT1} @tab @code{TINYINT} -@item @code{INT2} @tab @code{SMALLINT} -@item @code{INT3} @tab @code{MEDIUMINT} -@item @code{INT4} @tab @code{INT} -@item @code{INT8} @tab @code{BIGINT} -@item @code{LONG VARBINARY} @tab @code{MEDIUMBLOB} -@item @code{LONG VARCHAR} @tab @code{MEDIUMTEXT} -@item @code{MIDDLEINT} @tab @code{MEDIUMINT} -@item @code{VARBINARY(NUM)} @tab @code{VARCHAR(NUM) BINARY} -@end multitable - -Column type mapping occurs at table creation time. If you create a table -with types used by other vendors and then issue a @code{DESCRIBE tbl_name} -statement, MySQL reports the table structure using the equivalent -MySQL types. - - -@node Storage requirements, , Other-vendor column types, Column types -@subsection Column Type Storage Requirements - -@cindex storage requirements, column type -@cindex columns, storage requirements - -The storage requirements for each of the column types supported by -MySQL are listed by category. - -@cindex numeric types -@cindex types, numeric - -@subsubheading Storage requirements for numeric types - -@multitable @columnfractions .35 .65 -@item @strong{Column type} @tab @strong{Storage required} -@item @code{TINYINT} @tab 1 byte -@item @code{SMALLINT} @tab 2 bytes -@item @code{MEDIUMINT} @tab 3 bytes -@item @code{INT} @tab 4 bytes -@item @code{INTEGER} @tab 4 bytes -@item @code{BIGINT} @tab 8 bytes -@item @code{FLOAT(X)} @tab 4 if X <= 24 or 8 if 25 <= X <= 53 -@item @code{FLOAT} @tab 4 bytes -@item @code{DOUBLE} @tab 8 bytes -@item @code{DOUBLE PRECISION} @tab 8 bytes -@item @code{REAL} @tab 8 bytes -@item @code{DECIMAL(M,D)} @tab @code{M+2} bytes if D > 0, @code{M+1} bytes if D = 0 (@code{D}+2, if @code{M < D}) -@item @code{NUMERIC(M,D)} @tab @code{M+2} bytes if D > 0, @code{M+1} bytes if D = 0 (@code{D}+2, if @code{M < D}) -@end multitable - -@cindex date types -@cindex time types -@cindex types, date -@cindex types, time - -@subsubheading Storage requirements for date and time types - -@multitable @columnfractions .35 .65 -@item @strong{Column type} @tab @strong{Storage required} -@item @code{DATE} @tab 3 bytes -@item @code{DATETIME} @tab 8 bytes -@item @code{TIMESTAMP} @tab 4 bytes -@item @code{TIME} @tab 3 bytes -@item @code{YEAR} @tab 1 byte -@end multitable - -@subsubheading Storage requirements for string types - -@multitable @columnfractions .35 .65 -@item @strong{Column type} @tab @strong{Storage required} -@item @code{CHAR(M)} @tab @code{M} bytes, @code{1 <= M <= 255} -@item @code{VARCHAR(M)} @tab @code{L}+1 bytes, where @code{L <= M} and -@code{1 <= M <= 255} -@item @code{TINYBLOB}, @code{TINYTEXT} @tab @code{L}+1 bytes, -where @code{L} < 2^8 -@item @code{BLOB}, @code{TEXT} @tab @code{L}+2 bytes, -where @code{L} < 2^16 -@item @code{MEDIUMBLOB}, @code{MEDIUMTEXT} @tab @code{L}+3 bytes, -where @code{L} < 2^24 -@item @code{LONGBLOB}, @code{LONGTEXT} @tab @code{L}+4 bytes, -where @code{L} < 2^32 -@item @code{ENUM('value1','value2',...)} @tab 1 or 2 bytes, depending on -the number of enumeration values (65535 values maximum) -@item @code{SET('value1','value2',...)} @tab 1, 2, 3, 4 or 8 bytes, depending -on the number of set members (64 members maximum) -@end multitable - -@cindex @code{BLOB}, size -@cindex @code{TEXT}, size -@cindex @code{VARCHAR}, size -@code{VARCHAR} and the @code{BLOB} and @code{TEXT} types are variable-length -types, for which the storage requirements depend on the actual length of -column values (represented by @code{L} in the preceding table), rather than -on the type's maximum possible size. For example, a @code{VARCHAR(10)} -column can hold a string with a maximum length of 10 characters. The actual -storage required is the length of the string (@code{L}), plus 1 byte to -record the length of the string. For the string @code{'abcd'}, @code{L} is 4 -and the storage requirement is 5 bytes. - -The @code{BLOB} and @code{TEXT} types require 1, 2, 3, or 4 bytes to record -the length of the column value, depending on the maximum possible length of -the type. @xref{BLOB}. - -If a table includes any variable-length column types, the record format will -also be variable-length. Note that when a table is created, MySQL -may, under certain conditions, change a column from a variable-length type to a -fixed-length type, or vice-versa. @xref{Silent column changes}. - -@cindex ENUM, size -The size of an @code{ENUM} object is determined by the number of -different enumeration values. One byte is used for enumerations with up -to 255 possible values. Two bytes are used for enumerations with up to -65535 values. @xref{ENUM}. - -@cindex SET, size -The size of a @code{SET} object is determined by the number of different -set members. If the set size is @code{N}, the object occupies @code{(N+7)/8} -bytes, rounded up to 1, 2, 3, 4, or 8 bytes. A @code{SET} can have a maximum -of 64 members. @xref{SET}. - - -@node Functions, Data Manipulation, Column types, Reference -@section Functions for Use in @code{SELECT} and @code{WHERE} Clauses - -@cindex functions for @code{SELECT} and @code{WHERE} clauses - -A @code{select_expression} or @code{where_definition} in a SQL statement -can consist of any expression using the functions described below. - -An expression that contains @code{NULL} always produces a @code{NULL} value -unless otherwise indicated in the documentation for the operators and -functions involved in the expression. - -@strong{Note}: there must be no whitespace between a function name and the -parentheses following it. This helps the MySQL parser distinguish -between function calls and references to tables or columns that happen to -have the same name as a function. Spaces around arguments are permitted, -though. - -You can force MySQL to accept spaces after the function name by -starting @code{mysqld} with @code{--ansi} or using the -@code{CLIENT_IGNORE_SPACE} to @code{mysql_connect()}, but in this case all -function names will become reserved words. @xref{ANSI mode}. - -@need 2000 -For the sake of brevity, examples display the output from the @code{mysql} -program in abbreviated form. So this: - -@example -mysql> SELECT MOD(29,9); -1 rows in set (0.00 sec) - -+-----------+ -| mod(29,9) | -+-----------+ -| 2 | -+-----------+ -@end example - -is displayed like this: - -@example -mysql> SELECT MOD(29,9); - -> 2 -@end example - -@menu -* Non-typed Operators:: Non-Type-Specific Operators and Functions -* String functions:: String functions -* Numeric Functions:: Numeric Functions -* Date and time functions:: Date and time functions -* Cast Functions:: Cast Functions -* Other Functions:: Other Functions -* Group by functions:: Functions for Use with @code{GROUP BY} Clauses -@end menu - - -@node Non-typed Operators, String functions, Functions, Functions -@subsection Non-Type-Specific Operators and Functions - -@menu -* Parentheses:: Parentheses -* Comparison Operators:: Comparison Operators -* Logical Operators:: Logical Operators -* Control flow functions:: Control Flow Functions -@end menu - - -@node Parentheses, Comparison Operators, Non-typed Operators, Non-typed Operators -@subsubsection Parentheses - -@findex () (parentheses) -@findex parentheses ( and ) - -@cindex functions, grouping -@cindex grouping, expressions - -@example -( ... ) -@end example - -Use parentheses to force the order of evaluation in an expression. For -example: - -@example -mysql> SELECT 1+2*3; - -> 7 -mysql> SELECT (1+2)*3; - -> 9 -@end example - - - -@node Comparison Operators, Logical Operators, Parentheses, Non-typed Operators -@subsubsection Comparison Operators - -@findex comparison operators - -@cindex casts -@cindex type conversions - -Comparison operations result in a value of @code{1} (TRUE), @code{0} (FALSE), -or @code{NULL}. These functions work for both numbers and strings. Strings -are automatically converted to numbers and numbers to strings as needed (as -in Perl). - -MySQL performs comparisons using the following -rules: - -@itemize @bullet -@item -If one or both arguments are @code{NULL}, the result of the comparison -is @code{NULL}, except for the @code{<=>} operator. - -@item -If both arguments in a comparison operation are strings, they are compared as -strings. - -@item -If both arguments are integers, they are compared as integers. - -@item -Hexadecimal values are treated as binary strings if not compared to a number. - -@item -@cindex ODBC compatibility -@cindex compatibility, with ODBC -If one of the arguments is a @code{TIMESTAMP} or @code{DATETIME} column and -the other argument is a constant, the constant is converted -to a timestamp before the comparison is performed. This is done to be more -ODBC-friendly. - -@item -In all other cases, the arguments are compared as floating-point (real) -numbers. -@end itemize - -By default, string comparisons are done in case-independent fashion using the -current character set (ISO-8859-1 Latin1 by default, which also works -excellently for English). - -The following examples illustrate conversion of strings to numbers for comparison -operations: - -@example -mysql> SELECT 1 > '6x'; - -> 0 -mysql> SELECT 7 > '6x'; - -> 1 -mysql> SELECT 0 > 'x6'; - -> 0 -mysql> SELECT 0 = 'x6'; - -> 1 -@end example - -@table @code -@findex = (equal) -@findex equal (=) -@item = -Equal: -@example -mysql> SELECT 1 = 0; - -> 0 -mysql> SELECT '0' = 0; - -> 1 -mysql> SELECT '0.0' = 0; - -> 1 -mysql> SELECT '0.01' = 0; - -> 0 -mysql> SELECT '.01' = 0.01; - -> 1 -@end example - -@findex <> (not equal) -@findex not equal (<>) -@findex != (not equal) -@findex not equal (!=) -@item <> -@itemx != -Not equal: -@example -mysql> SELECT '.01' <> '0.01'; - -> 1 -mysql> SELECT .01 <> '0.01'; - -> 0 -mysql> SELECT 'zapp' <> 'zappp'; - -> 1 -@end example - -@findex <= (less than or equal) -@findex less than or equal (<=) -@item <= -Less than or equal: -@example -mysql> SELECT 0.1 <= 2; - -> 1 -@end example - -@findex < (less than) -@findex less than (<) -@item < -Less than: -@example -mysql> SELECT 2 < 2; - -> 0 -@end example - -@findex >= (greater than or equal) -@findex greater than or equal (>=) -@item >= -Greater than or equal: -@example -mysql> SELECT 2 >= 2; - -> 1 -@end example - -@findex > (greater than) -@findex greater than (>) -@item > -Greater than: -@example -mysql> SELECT 2 > 2; - -> 0 -@end example - -@cindex @code{NULL}, testing for null -@findex <=> (Equal to) -@item <=> -NULL safe equal: -@example -mysql> SELECT 1 <=> 1, NULL <=> NULL, 1 <=> NULL; - -> 1 1 0 -@end example - -@cindex @code{NULL}, testing for null -@findex IS NULL -@findex IS NOT NULL -@item IS NULL -@itemx IS NOT NULL -Test whether a value is or is not @code{NULL}: -@example -mysql> SELECT 1 IS NULL, 0 IS NULL, NULL IS NULL; - -> 0 0 1 -mysql> SELECT 1 IS NOT NULL, 0 IS NOT NULL, NULL IS NOT NULL; - -> 1 1 0 -@end example - -@cindex ODBC compatibility -@cindex compatibility, with ODBC -To be able to work good with other programs, MySQL supports the following -extra features when using @code{IS NULL}: - -@itemize @bullet -@item -You can find the last inserted row with: - -@example -SELECT * FROM tbl_name WHERE auto_col IS NULL -@end example - -This can be disabled by setting @code{SQL_AUTO_IS_NULL=0}. @xref{SET OPTION}. -@item -For @code{NOT NULL} @code{DATE} and @code{DATETIME} columns you can find -the special date @code{0000-00-00} by using: - -@example -SELECT * FROM tbl_name WHERE date_column IS NULL -@end example - -This is needed to get some ODBC applications to work (as ODBC doesn't -support a @code{0000-00-00} date) -@end itemize - -@findex BETWEEN ... AND -@item expr BETWEEN min AND max -If @code{expr} is greater than or equal to @code{min} and @code{expr} is -less than or equal to @code{max}, @code{BETWEEN} returns @code{1}, -otherwise it returns @code{0}. This is equivalent to the expression -@code{(min <= expr AND expr <= max)} if all the arguments are of the -same type. The first argument (@code{expr}) determines how the -comparison is performed as follows: - -@itemize @bullet -@item -If @code{expr} is a @code{TIMESTAMP}, @code{DATE}, or @code{DATETIME} -column, @code{MIN()} and @code{MAX()} are formatted to the same format if -they are constants. -@item -If @code{expr} is a case-insensitive string expression, a case-insensitive -string comparison is done. -@item -If @code{expr} is a case-sensitive string expression, a case-sensitive -string comparison is done. -@item -If @code{expr} is an integer expression, an integer comparison is done. -@item -Otherwise, a floating-point (real) comparison is done. -@end itemize - -@example -mysql> SELECT 1 BETWEEN 2 AND 3; - -> 0 -mysql> SELECT 'b' BETWEEN 'a' AND 'c'; - -> 1 -mysql> SELECT 2 BETWEEN 2 AND '3'; - -> 1 -mysql> SELECT 2 BETWEEN 2 AND 'x-3'; - -> 0 -@end example - -@findex NOT BETWEEN -@item expr NOT BETWEEN min AND max -Same as @code{NOT (expr BETWEEN min AND max)}. - -@findex IN -@item expr IN (value,...) -Returns @code{1} if @code{expr} is any of the values in the @code{IN} list, -else returns @code{0}. If all values are constants, then all values are -evaluated according to the type of @code{expr} and sorted. The search for the -item is then done using a binary search. This means @code{IN} is very quick -if the @code{IN} value list consists entirely of constants. If @code{expr} -is a case-sensitive string expression, the string comparison is performed in -case-sensitive fashion: - -@example -mysql> SELECT 2 IN (0,3,5,'wefwf'); - -> 0 -mysql> SELECT 'wefwf' IN (0,3,5,'wefwf'); - -> 1 -@end example - -@findex NOT IN -@item expr NOT IN (value,...) -Same as @code{NOT (expr IN (value,...))}. - -@findex ISNULL() -@item ISNULL(expr) -If @code{expr} is @code{NULL}, @code{ISNULL()} returns @code{1}, otherwise -it returns @code{0}: -@example -mysql> SELECT ISNULL(1+1); - -> 0 -mysql> SELECT ISNULL(1/0); - -> 1 -@end example - -Note that a comparison of @code{NULL} values using @code{=} will always be -false! - -@cindex @code{NULL}, testing for null -@findex COALESCE() -@item COALESCE(list) -Returns first non-@code{NULL} element in list: - -@example -mysql> SELECT COALESCE(NULL,1); - -> 1 -mysql> SELECT COALESCE(NULL,NULL,NULL); - -> NULL -@end example - -@findex INTERVAL() -@item INTERVAL(N,N1,N2,N3,...) -Returns @code{0} if @code{N} < @code{N1}, @code{1} if @code{N} < @code{N2} -and so on. All arguments are treated as integers. It is required that -@code{N1} < @code{N2} < @code{N3} < @code{...} < @code{Nn} for this function -to work correctly. This is because a binary search is used (very fast): - -@example -mysql> SELECT INTERVAL(23, 1, 15, 17, 30, 44, 200); - -> 3 -mysql> SELECT INTERVAL(10, 1, 10, 100, 1000); - -> 2 -mysql> SELECT INTERVAL(22, 23, 30, 44, 200); - -> 0 -@end example -@end table - -If you are comparing case-insensitive strings with any of the standard -operators (@code{=}, @code{<>}..., but not @code{LIKE}) trailing whitespace -(spaces, tabs and newlines) will be ignored. - -@example -mysql> SELECT "a" ="A \n"; - -> 1 -@end example - - -@node Logical Operators, Control flow functions, Comparison Operators, Non-typed Operators -@subsubsection Logical Operators - -@findex Logical operators -@findex Operators, logical - -All logical operators evaluate to @code{1} (TRUE), @code{0} (FALSE) or -@code{NULL} (unknown, which is in most cases the same as FALSE): - -@table @code -@findex NOT, logical -@findex ! (logical NOT) -@item NOT -@itemx ! -Logical NOT. Evaluates to @code{1} if the operand is @code{0}, otherwise -evaluates to @code{0}. -Exception: @code{NOT NULL} evaluates to @code{NULL}: -@example -mysql> SELECT NOT 1; - -> 0 -mysql> SELECT NOT NULL; - -> NULL -mysql> SELECT ! (1+1); - -> 0 -mysql> SELECT ! 1+1; - -> 1 -@end example -The last example produces @code{1} because the expression evaluates -the same way as @code{(!1)+1}. - -@findex OR, logical -@findex || (logical OR) -@item OR -@itemx || -Logical OR. Evaluates to @code{1} if either operand is not @code{0} and not -@code{NULL}: -@example -mysql> SELECT 1 || 0; - -> 1 -mysql> SELECT 0 || 0; - -> 0 -mysql> SELECT 1 || NULL; - -> 1 - -@end example - -@findex AND, logical -@findex && (logical AND) -@item AND -@itemx && -Logical AND. For non-@code{NULL} operands, evaluates to @code{1} if both -operands are non-zero and to @code{0} otherwise. -Produces @code{NULL} if either operand is @code{NULL}: -@example -mysql> SELECT 1 && 1; - -> 1 -mysql> SELECT 1 && 0; - -> 0 -mysql> SELECT 1 && NULL; - -> NULL -@end example - -@findex XOR, logical -@item XOR -Logical XOR. For non-@code{NULL} operands, evaluates to @code{1} if only one -of the operators is non-zero. -Produces @code{NULL} if either operand is @code{NULL}: -@example -mysql> SELECT 1 XOR 1; - -> 0 -mysql> SELECT 1 XOR 0; - -> 1 -mysql> SELECT 1 XOR NULL; - -> NULL -@end example - -@code{a XOR b} is equal to @code{(a AND (NOT b)) OR ((NOT a) and b)}. -@end table - - -@node Control flow functions, , Logical Operators, Non-typed Operators -@subsubsection Control Flow Functions - -@findex control flow functions -@findex functions, control flow - -@table @code -@cindex @code{NULL}, testing for null -@findex IFNULL() -@item IFNULL(expr1,expr2) -If @code{expr1} is not @code{NULL}, @code{IFNULL()} returns @code{expr1}, -else it returns @code{expr2}. @code{IFNULL()} returns a numeric or string -value, depending on the context in which it is used: -@example -mysql> SELECT IFNULL(1,0); - -> 1 -mysql> SELECT IFNULL(NULL,10); - -> 10 -mysql> SELECT IFNULL(1/0,10); - -> 10 -mysql> SELECT IFNULL(1/0,'yes'); - -> 'yes' -@end example - -@findex NULLIF() -@item NULLIF(expr1,expr2) -If @code{expr1 = expr2} is true, return @code{NULL} else return @code{expr1}. -This is the same as @code{CASE WHEN x = y THEN NULL ELSE x END}: -@example -mysql> SELECT NULLIF(1,1); - -> NULL -mysql> SELECT NULLIF(1,2); - -> 1 -@end example - -Note that @code{expr1} is evaluated twice in MySQL if the arguments -are equal. - -@findex IF() -@item IF(expr1,expr2,expr3) -If @code{expr1} is TRUE (@code{expr1 <> 0} and @code{expr1 <> NULL}) then -@code{IF()} returns @code{expr2}, else it returns @code{expr3}. -@code{IF()} returns a numeric or string value, depending on the context -in which it is used: - -@example -mysql> SELECT IF(1>2,2,3); - -> 3 -mysql> SELECT IF(1<2,'yes','no'); - -> 'yes' -mysql> SELECT IF(STRCMP('test','test1'),'no','yes'); - -> 'no' -@end example - -If @code{expr2} or @code{expr3} is explicitely @code{NULL} then the -result type of the @code{IF()} function is the type of the not -@code{NULL} column. (This behaviour is new in MySQL 4.0.3). - -@code{expr1} is evaluated as an integer value, which means that if you are -testing floating-point or string values, you should do so using a comparison -operation: - -@example -mysql> SELECT IF(0.1,1,0); - -> 0 -mysql> SELECT IF(0.1<>0,1,0); - -> 1 -@end example - -In the first case above, @code{IF(0.1)} returns @code{0} because @code{0.1} -is converted to an integer value, resulting in a test of @code{IF(0)}. This -may not be what you expect. In the second case, the comparison tests the -original floating-point value to see whether it is non-zero. The result -of the comparison is used as an integer. - -The default return type of @code{IF()} (which may matter when it is -stored into a temporary table) is calculated in MySQL Version -3.23 as follows: - -@multitable @columnfractions .50 .20 -@item @strong{Expression} @tab @strong{Return value} -@item expr2 or expr3 returns string @tab string -@item expr2 or expr3 returns a floating-point value @tab floating-point -@item expr2 or expr3 returns an integer @tab integer -@end multitable - -If expr2 and expr3 are strings, then the result is case-insensitive if -both strings are case-insensitive. (Starting from 3.23.51) - -@findex CASE -@item CASE value WHEN [compare-value] THEN result [WHEN [compare-value] THEN result ...] [ELSE result] END -@item CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...] [ELSE result] END - -The first version returns the @code{result} where -@code{value=compare-value}. The second version returns the result for -the first condition, which is true. If there was no matching result -value, then the result after @code{ELSE} is returned. If there is no -@code{ELSE} part then @code{NULL} is returned: - -@example -mysql> SELECT CASE 1 WHEN 1 THEN "one" - WHEN 2 THEN "two" ELSE "more" END; - -> "one" -mysql> SELECT CASE WHEN 1>0 THEN "true" ELSE "false" END; - -> "true" -mysql> SELECT CASE BINARY "B" WHEN "a" THEN 1 WHEN "b" THEN 2 END; - -> NULL -@end example -@end table - -The type of the return value (@code{INTEGER}, @code{DOUBLE} or -@code{STRING}) is the same as the type of the first returned value (the -expression after the first @code{THEN}). - - -@node String functions, Numeric Functions, Non-typed Operators, Functions -@subsection String Functions - -@findex string functions -@findex functions, string - -String-valued functions return @code{NULL} if the length of the result would -be greater than the @code{max_allowed_packet} server parameter. @xref{Server -parameters}. - -For functions that operate on string positions, -the first position is numbered 1. - -@table @code -@findex ASCII() -@item ASCII(str) -Returns the ASCII code value of the leftmost character of the string -@code{str}. Returns @code{0} if @code{str} is the empty string. Returns -@code{NULL} if @code{str} is @code{NULL}: - -@example -mysql> SELECT ASCII('2'); - -> 50 -mysql> SELECT ASCII(2); - -> 50 -mysql> SELECT ASCII('dx'); - -> 100 -@end example - -See also the @code{ORD()} function. - -@findex ORD() -@item ORD(str) -If the leftmost character of the string @code{str} is a multi-byte character, -returns the code for that character, calculated from the ASCII code values -of its constituent characters using this formula: -@code{((first byte ASCII code)*256+(second byte ASCII code))[*256+third byte ASCII code...]}. -If the leftmost character is not a multi-byte character, returns the same -value that the @code{ASCII()} function does: - -@example -mysql> SELECT ORD('2'); - -> 50 -@end example - -@findex CONV() -@item CONV(N,from_base,to_base) -Converts numbers between different number bases. Returns a string -representation of the number @code{N}, converted from base @code{from_base} -to base @code{to_base}. Returns @code{NULL} if any argument is @code{NULL}. -The argument @code{N} is interpreted as an integer, but may be specified as -an integer or a string. The minimum base is @code{2} and the maximum base is -@code{36}. If @code{to_base} is a negative number, @code{N} is regarded as a -signed number. Otherwise, @code{N} is treated as unsigned. @code{CONV} works -with 64-bit precision: - -@example -mysql> SELECT CONV("a",16,2); - -> '1010' -mysql> SELECT CONV("6E",18,8); - -> '172' -mysql> SELECT CONV(-17,10,-18); - -> '-H' -mysql> SELECT CONV(10+"10"+'10'+0xa,10,10); - -> '40' -@end example - -@findex BIN() -@item BIN(N) -Returns a string representation of the binary value of @code{N}, where -@code{N} is a longlong (@code{BIGINT}) number. This is equivalent to -@code{CONV(N,10,2)}. Returns @code{NULL} if @code{N} is @code{NULL}: - -@example -mysql> SELECT BIN(12); - -> '1100' -@end example - -@findex OCT() -@item OCT(N) -Returns a string representation of the octal value of @code{N}, where -@code{N} is a longlong number. This is equivalent to @code{CONV(N,10,8)}. -Returns @code{NULL} if @code{N} is @code{NULL}: - -@example -mysql> SELECT OCT(12); - -> '14' -@end example - -@findex HEX() -@item HEX(N_or_S) - -If N_OR_S is a number, returns a string representation of the hexadecimal -value of @code{N}, where @code{N} is a longlong (@code{BIGINT}) number. -This is equivalent to @code{CONV(N,10,16)}. - -If N_OR_S is a string, returns a hexadecimal string of N_OR_S where each -character in N_OR_S is converted to 2 hexadecimal digits. This is the -invers of the @code{0xff} strings. - -@example -mysql> SELECT HEX(255); - -> 'FF' -mysql> SELECT HEX("abc"); - -> 616263 -mysql> SELECT 0x616263; - -> "abc" -@end example - -@findex CHAR() -@item CHAR(N,...) -@code{CHAR()} interprets the arguments as integers and returns a string -consisting of the characters given by the ASCII code values of those -integers. @code{NULL} values are skipped: - -@example -mysql> SELECT CHAR(77,121,83,81,'76'); - -> 'MySQL' -mysql> SELECT CHAR(77,77.3,'77.3'); - -> 'MMM' -@end example - -@findex CONCAT() -@item CONCAT(str1,str2,...) -Returns the string that results from concatenating the arguments. Returns -@code{NULL} if any argument is @code{NULL}. May have more than 2 arguments. -A numeric argument is converted to the equivalent string form: - -@example -mysql> SELECT CONCAT('My', 'S', 'QL'); - -> 'MySQL' -mysql> SELECT CONCAT('My', NULL, 'QL'); - -> NULL -mysql> SELECT CONCAT(14.3); - -> '14.3' -@end example - -@findex CONCAT_WS() -@item CONCAT_WS(separator, str1, str2,...) - -@code{CONCAT_WS()} stands for CONCAT With Separator and is a special form of -@code{CONCAT()}. The first argument is the separator for the rest of the -arguments. The separator can be a string as well as the rest of the -arguments. If the separator is @code{NULL}, the result will be @code{NULL}. -The function will skip any @code{NULL}s and empty strings, after the -separator argument. The separator will be added between the strings to be -concatenated: - -@example -mysql> SELECT CONCAT_WS(",","First name","Second name","Last Name"); - -> 'First name,Second name,Last Name' -mysql> SELECT CONCAT_WS(",","First name",NULL,"Last Name"); - -> 'First name,Last Name' -@end example - -@findex LENGTH() -@findex OCTET_LENGTH() -@findex CHAR_LENGTH() -@findex CHARACTER_LENGTH() -@item LENGTH(str) -@itemx OCTET_LENGTH(str) -@itemx CHAR_LENGTH(str) -@itemx CHARACTER_LENGTH(str) -Returns the length of the string @code{str}: - -@example -mysql> SELECT LENGTH('text'); - -> 4 -mysql> SELECT OCTET_LENGTH('text'); - -> 4 -@end example - -Note that for @code{CHAR_LENGTH()} and @code{CHARACTER_LENGTH()}, multi-byte -characters are only counted once. - -@findex BIT_LENGTH() -@item BIT_LENGTH(str) -Returns the length of the string @code{str} in bits: - -@example -mysql> SELECT BIT_LENGTH('text'); - -> 32 -@end example - -@findex LOCATE() -@findex POSITION() -@item LOCATE(substr,str) -@itemx POSITION(substr IN str) -Returns the position of the first occurrence of substring @code{substr} -in string @code{str}. Returns @code{0} if @code{substr} is not in @code{str}: - -@example -mysql> SELECT LOCATE('bar', 'foobarbar'); - -> 4 -mysql> SELECT LOCATE('xbar', 'foobar'); - -> 0 -@end example - -This function is multi-byte safe. In MySQL 3.23 this function is case -sensitive, while in 4.0 it's only case-sensitive if either argument is -a binary string. - -@findex LOCATE() -@item LOCATE(substr,str,pos) -Returns the position of the first occurrence of substring @code{substr} in -string @code{str}, starting at position @code{pos}. -Returns @code{0} if @code{substr} is not in @code{str}: - -@example -mysql> SELECT LOCATE('bar', 'foobarbar',5); - -> 7 -@end example - -This function is multi-byte safe. In MySQL 3.23 this function is case -sensitive, while in 4.0 it's only case-sensitive if either argument is -a binary string. - -@findex INSTR() -@item INSTR(str,substr) -Returns the position of the first occurrence of substring @code{substr} in -string @code{str}. This is the same as the two-argument form of -@code{LOCATE()}, except that the arguments are swapped: - -@example -mysql> SELECT INSTR('foobarbar', 'bar'); - -> 4 -mysql> SELECT INSTR('xbar', 'foobar'); - -> 0 -@end example - -This function is multi-byte safe. In MySQL 3.23 this function is case -sensitive, while in 4.0 it's only case-sensitive if either argument is -a binary string. - -@findex LPAD() -@item LPAD(str,len,padstr) -Returns the string @code{str}, left-padded with the string @code{padstr} -until @code{str} is @code{len} characters long. If @code{str} is longer -than @code{len'} then it will be shortened to @code{len} characters. - -@example -mysql> SELECT LPAD('hi',4,'??'); - -> '??hi' -@end example - -@findex RPAD() -@item RPAD(str,len,padstr) -Returns the string @code{str}, right-padded with the string -@code{padstr} until @code{str} is @code{len} characters long. If -@code{str} is longer than @code{len'} then it will be shortened to -@code{len} characters. - -@example -mysql> SELECT RPAD('hi',5,'?'); - -> 'hi???' -@end example - -@findex LEFT() -@item LEFT(str,len) -Returns the leftmost @code{len} characters from the string @code{str}: - -@example -mysql> SELECT LEFT('foobarbar', 5); - -> 'fooba' -@end example - -This function is multi-byte safe. - -@findex RIGHT() -@item RIGHT(str,len) -Returns the rightmost @code{len} characters from the string @code{str}: - -@example -mysql> SELECT RIGHT('foobarbar', 4); - -> 'rbar' -@end example - -This function is multi-byte safe. - -@findex SUBSTRING() -@findex MID() -@item SUBSTRING(str,pos,len) -@itemx SUBSTRING(str FROM pos FOR len) -@itemx MID(str,pos,len) -Returns a substring @code{len} characters long from string @code{str}, -starting at position @code{pos}. -The variant form that uses @code{FROM} is ANSI SQL92 syntax: - -@example -mysql> SELECT SUBSTRING('Quadratically',5,6); - -> 'ratica' -@end example - -This function is multi-byte safe. - -@findex SUBSTRING() -@item SUBSTRING(str,pos) -@item SUBSTRING(str FROM pos) -Returns a substring from string @code{str} starting at position @code{pos}: - -@example -mysql> SELECT SUBSTRING('Quadratically',5); - -> 'ratically' -mysql> SELECT SUBSTRING('foobarbar' FROM 4); - -> 'barbar' -@end example - -This function is multi-byte safe. - -@findex SUBSTRING_INDEX() -@item SUBSTRING_INDEX(str,delim,count) -Returns the substring from string @code{str} before @code{count} -occurrences of the delimiter @code{delim}. -If @code{count} is positive, everything to the left of the final delimiter -(counting from the left) is returned. -If @code{count} is negative, everything to the right of the final delimiter -(counting from the right) is returned: - -@example -mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 2); - -> 'www.mysql' -mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', -2); - -> 'mysql.com' -@end example - -This function is multi-byte safe. - -@findex LTRIM() -@item LTRIM(str) -Returns the string @code{str} with leading space characters removed: - -@example -mysql> SELECT LTRIM(' barbar'); - -> 'barbar' -@end example - -@findex RTRIM() -@item RTRIM(str) -Returns the string @code{str} with trailing space characters removed: - -@example -mysql> SELECT RTRIM('barbar '); - -> 'barbar' -@end example - -This function is multi-byte safe. - -@findex TRIM() -@item TRIM([[BOTH | LEADING | TRAILING] [remstr] FROM] str) -Returns the string @code{str} with all @code{remstr} prefixes and/or suffixes -removed. If none of the specifiers @code{BOTH}, @code{LEADING} or -@code{TRAILING} are given, @code{BOTH} is assumed. If @code{remstr} is not -specified, spaces are removed: - -@example -mysql> SELECT TRIM(' bar '); - -> 'bar' -mysql> SELECT TRIM(LEADING 'x' FROM 'xxxbarxxx'); - -> 'barxxx' -mysql> SELECT TRIM(BOTH 'x' FROM 'xxxbarxxx'); - -> 'bar' -mysql> SELECT TRIM(TRAILING 'xyz' FROM 'barxxyz'); - -> 'barx' -@end example - -This function is multi-byte safe. - -@findex SOUNDEX() -@item SOUNDEX(str) -Returns a soundex string from @code{str}. Two strings that sound almost the -same should have identical soundex strings. A standard soundex string -is 4 characters long, but the @code{SOUNDEX()} function returns an -arbitrarily long string. You can use @code{SUBSTRING()} on the result to get -a standard soundex string. All non-alphanumeric characters are ignored -in the given string. All international alpha characters outside the A-Z range -are treated as vowels: - -@example -mysql> SELECT SOUNDEX('Hello'); - -> 'H400' -mysql> SELECT SOUNDEX('Quadratically'); - -> 'Q36324' -@end example - -@findex SPACE() -@item SPACE(N) -Returns a string consisting of @code{N} space characters: - -@example -mysql> SELECT SPACE(6); - -> ' ' -@end example - -@findex REPLACE() -@item REPLACE(str,from_str,to_str) -Returns the string @code{str} with all all occurrences of the string -@code{from_str} replaced by the string @code{to_str}: - -@example -mysql> SELECT REPLACE('www.mysql.com', 'w', 'Ww'); - -> 'WwWwWw.mysql.com' -@end example - -This function is multi-byte safe. - -@findex REPEAT() -@item REPEAT(str,count) -Returns a string consisting of the string @code{str} repeated @code{count} -times. If @code{count <= 0}, returns an empty string. Returns @code{NULL} if -@code{str} or @code{count} are @code{NULL}: - -@example -mysql> SELECT REPEAT('MySQL', 3); - -> 'MySQLMySQLMySQL' -@end example - -@findex REVERSE() -@item REVERSE(str) -Returns the string @code{str} with the order of the characters reversed: - -@example -mysql> SELECT REVERSE('abc'); - -> 'cba' -@end example - -This function is multi-byte safe. - -@findex INSERT() -@item INSERT(str,pos,len,newstr) -Returns the string @code{str}, with the substring beginning at position -@code{pos} and @code{len} characters long replaced by the string -@code{newstr}: - -@example -mysql> SELECT INSERT('Quadratic', 3, 4, 'What'); - -> 'QuWhattic' -@end example - -This function is multi-byte safe. - -@findex ELT() -@item ELT(N,str1,str2,str3,...) -Returns @code{str1} if @code{N} = @code{1}, @code{str2} if @code{N} = -@code{2}, and so on. Returns @code{NULL} if @code{N} is less than @code{1} -or greater than the number of arguments. @code{ELT()} is the complement of -@code{FIELD()}: - -@example -mysql> SELECT ELT(1, 'ej', 'Heja', 'hej', 'foo'); - -> 'ej' -mysql> SELECT ELT(4, 'ej', 'Heja', 'hej', 'foo'); - -> 'foo' -@end example - -@findex FIELD() -@item FIELD(str,str1,str2,str3,...) -Returns the index of @code{str} in the @code{str1}, @code{str2}, -@code{str3}, @code{...} list. -Returns @code{0} if @code{str} is not found. -@code{FIELD()} is the complement of @code{ELT()}: - -@example -mysql> SELECT FIELD('ej', 'Hej', 'ej', 'Heja', 'hej', 'foo'); - -> 2 -mysql> SELECT FIELD('fo', 'Hej', 'ej', 'Heja', 'hej', 'foo'); - -> 0 -@end example - -@findex FIND_IN_SET() -@item FIND_IN_SET(str,strlist) -Returns a value @code{1} to @code{N} if the string @code{str} is in the list -@code{strlist} consisting of @code{N} substrings. A string list is a string -composed of substrings separated by @samp{,} characters. If the first -argument is a constant string and the second is a column of type @code{SET}, -the @code{FIND_IN_SET()} function is optimised to use bit arithmetic! -Returns @code{0} if @code{str} is not in @code{strlist} or if @code{strlist} -is the empty string. Returns @code{NULL} if either argument is @code{NULL}. -This function will not work properly if the first argument contains a -@samp{,}: - -@example -mysql> SELECT FIND_IN_SET('b','a,b,c,d'); - -> 2 -@end example - -@findex MAKE_SET() -@item MAKE_SET(bits,str1,str2,...) -Returns a set (a string containing substrings separated by @samp{,} -characters) consisting of the strings that have the corresponding bit in -@code{bits} set. @code{str1} corresponds to bit 0, @code{str2} to bit 1, -etc. @code{NULL} strings in @code{str1}, @code{str2}, @code{...} -are not appended to the result: - -@example -mysql> SELECT MAKE_SET(1,'a','b','c'); - -> 'a' -mysql> SELECT MAKE_SET(1 | 4,'hello','nice','world'); - -> 'hello,world' -mysql> SELECT MAKE_SET(0,'a','b','c'); - -> '' -@end example - -@findex EXPORT_SET() -@item EXPORT_SET(bits,on,off,[separator,[number_of_bits]]) -Returns a string where for every bit set in 'bit', you get an 'on' string -and for every reset bit you get an 'off' string. Each string is separated -with 'separator' (default ',') and only 'number_of_bits' (default 64) of -'bits' is used: - -@example -mysql> SELECT EXPORT_SET(5,'Y','N',',',4) - -> Y,N,Y,N -@end example - -@findex LCASE() -@findex LOWER() -@item LCASE(str) -@itemx LOWER(str) -Returns the string @code{str} with all characters changed to lowercase -according to the current character set mapping (the default is ISO-8859-1 -Latin1): - -@example -mysql> SELECT LCASE('QUADRATICALLY'); - -> 'quadratically' -@end example - -This function is multi-byte safe. - -@findex UCASE() -@findex UPPER() -@item UCASE(str) -@itemx UPPER(str) -Returns the string @code{str} with all characters changed to uppercase -according to the current character set mapping (the default is ISO-8859-1 -Latin1): - -@example -mysql> SELECT UCASE('Hej'); - -> 'HEJ' -@end example - -This function is multi-byte safe. - -@findex FILE -@findex LOAD_FILE() -@item LOAD_FILE(file_name) -Reads the file and returns the file contents as a string. The file -must be on the server, you must specify the full pathname to the -file, and you must have the @code{FILE} privilege. The file must -be readable by all and be smaller than @code{max_allowed_packet}. - -If the file doesn't exist or can't be read due to one of the above reasons, -the function returns @code{NULL}: - -@example -mysql> UPDATE tbl_name - SET blob_column=LOAD_FILE("/tmp/picture") - WHERE id=1; -@end example - -If you are not using MySQL Version 3.23, you have to do the reading -of the file inside your application and create an @code{INSERT} statement -to update the database with the file information. One way to do this, if -you are using the MySQL++ library, can be found at -@uref{http://www.mysql.com/documentation/mysql++/mysql++-examples.html}. - -@findex QUOTE() -@item QUOTE(str) -Quotes a string to produce a result that can be used as a properly-escaped -data value in a SQL statement. The string is returned surrounded by single -quotes and with each instance of single quote (@samp{'}), backslash (@samp{\}), -ASCII NUL, and Control-Z preceded by a backslash. If the argument is -@code{NULL}, the return value is the word ``NULL'' without surrounding -single quotes. - -@example -mysql> SELECT QUOTE("Don't"); - -> 'Don\'t!' -mysql> SELECT QUOTE(NULL); - -> NULL -@end example - -@end table - -MySQL automatically converts numbers to strings as necessary, and -vice-versa: - -@example -mysql> SELECT 1+"1"; - -> 2 -mysql> SELECT CONCAT(2,' test'); - -> '2 test' -@end example - -If you want to convert a number to a string explicitly, pass it as the -argument to @code{CONCAT()}. - -If a string function is given a binary string as an argument, the resulting -string is also a binary string. A number converted to a string is treated as -a binary string. This only affects comparisons. - - -@menu -* String comparison functions:: String Comparison Functions -* Case Sensitivity Operators:: Case-Sensitivity -@end menu - -@node String comparison functions, Case Sensitivity Operators, String functions, String functions -@subsubsection String Comparison Functions - -@findex string comparison functions -@findex functions, string comparison - -@cindex case-sensitivity, in string comparisons -@cindex string comparisons, case-sensitivity - -Normally, if any expression in a string comparison is case-sensitive, the -comparison is performed in case-sensitive fashion. - -@table @code -@findex LIKE -@item expr LIKE pat [ESCAPE 'escape-char'] -Pattern matching using -SQL simple regular expression comparison. Returns @code{1} (TRUE) or @code{0} -(FALSE). With @code{LIKE} you can use the following two wildcard characters -in the pattern: - -@multitable @columnfractions .10 .60 -@item @strong{Char} @tab @strong{Description} -@item @code{%} @tab Matches any number of characters, even zero characters -@item @code{_} @tab Matches exactly one character -@end multitable - -@example -mysql> SELECT 'David!' LIKE 'David_'; - -> 1 -mysql> SELECT 'David!' LIKE '%D%v%'; - -> 1 -@end example - -To test for literal instances of a wildcard character, precede the character -with the escape character. If you don't specify the @code{ESCAPE} character, -@samp{\} is assumed: - -@multitable @columnfractions .10 .60 -@item @strong{String} @tab @strong{Description} -@item @code{\%} @tab Matches one @code{%} character -@item @code{\_} @tab Matches one @code{_} character -@end multitable - -@example -mysql> SELECT 'David!' LIKE 'David\_'; - -> 0 -mysql> SELECT 'David_' LIKE 'David\_'; - -> 1 -@end example - -To specify a different escape character, use the @code{ESCAPE} clause: - -@example -mysql> SELECT 'David_' LIKE 'David|_' ESCAPE '|'; - -> 1 -@end example - -The following two statements illustrate that string comparisons are -case-insensitive unless one of the operands is a binary string: - -@example -mysql> SELECT 'abc' LIKE 'ABC'; - -> 1 -mysql> SELECT 'abc' LIKE BINARY 'ABC'; - -> 0 -@end example - -@code{LIKE} is allowed on numeric expressions! (This is a MySQL -extension to the ANSI SQL @code{LIKE}.) - -@example -mysql> SELECT 10 LIKE '1%'; - -> 1 -@end example - -Note: Because MySQL uses the C escape syntax in strings (for example, -@samp{\n}), you must double any @samp{\} that you use in your @code{LIKE} -strings. For example, to search for @samp{\n}, specify it as @samp{\\n}. To -search for @samp{\}, specify it as @samp{\\\\} (the backslashes are stripped -once by the parser and another time when the pattern match is done, leaving -a single backslash to be matched). - -@findex NOT LIKE -@item expr NOT LIKE pat [ESCAPE 'escape-char'] -Same as @code{NOT (expr LIKE pat [ESCAPE 'escape-char'])}. - -@findex SOUNDS LIKE -@item expr SOUNDS LIKE expr -Same as @code{SOUNDEX(expr)=SOUNDEX(expr)}. - -@cindex mSQL compatibility -@cindex compatibility, with mSQL -@findex REGEXP -@findex RLIKE -@item expr REGEXP pat -@itemx expr RLIKE pat -Performs a pattern match of a string expression @code{expr} against a pattern -@code{pat}. The pattern can be an extended regular expression. -@xref{Regexp}. Returns @code{1} if @code{expr} matches @code{pat}, otherwise -returns @code{0}. @code{RLIKE} is a synonym for @code{REGEXP}, provided for -@code{mSQL} compatibility. Note: Because MySQL uses the C escape -syntax in strings (for example, @samp{\n}), you must double any @samp{\} that -you use in your @code{REGEXP} strings. As of MySQL Version 3.23.4, -@code{REGEXP} is case-insensitive for normal (not binary) strings: - -@example -mysql> SELECT 'Monty!' REGEXP 'm%y%%'; - -> 0 -mysql> SELECT 'Monty!' REGEXP '.*'; - -> 1 -mysql> SELECT 'new*\n*line' REGEXP 'new\\*.\\*line'; - -> 1 -mysql> SELECT "a" REGEXP "A", "a" REGEXP BINARY "A"; - -> 1 0 -mysql> SELECT "a" REGEXP "^[a-d]"; - -> 1 -@end example - -@item -@code{REGEXP} and @code{RLIKE} use the current character set (ISO-8859-1 -Latin1 by default) when deciding the type of a character. - -@findex NOT REGEXP -@item expr NOT REGEXP pat -@itemx expr NOT RLIKE pat -Same as @code{NOT (expr REGEXP pat)}. - -@findex STRCMP() -@item STRCMP(expr1,expr2) -@code{STRCMP()} -returns @code{0} if the strings are the same, @code{-1} if the first -argument is smaller than the second according to the current sort order, -and @code{1} otherwise: - -@example -mysql> SELECT STRCMP('text', 'text2'); - -> -1 -mysql> SELECT STRCMP('text2', 'text'); - -> 1 -mysql> SELECT STRCMP('text', 'text'); - -> 0 -@end example - -@findex MATCH ... AGAINST() -@item MATCH (col1,col2,...) AGAINST (expr) -@itemx MATCH (col1,col2,...) AGAINST (expr IN BOOLEAN MODE) -@code{MATCH ... AGAINST()} is used for full-text search and returns -relevance - similarity measure between the text in columns -@code{(col1,col2,...)} and the query @code{expr}. Relevance is a -positive floating-point number. Zero relevance means no similarity. -@code{MATCH ... AGAINST()} is available in MySQL version -3.23.23 or later. @code{IN BOOLEAN MODE} extension was added in version -4.0.1. For details and usage examples, see @ref{Fulltext Search}. -@end table - -@node Case Sensitivity Operators, , String comparison functions, String functions -@subsubsection Case-Sensitivity - -@findex casts - -@cindex cast operators -@cindex operators, cast - -@table @code -@findex BINARY -@item @code{BINARY} -The @code{BINARY} operator casts the string following it to a binary string. -This is an easy way to force a column comparison to be case-sensitive even -if the column isn't defined as @code{BINARY} or @code{BLOB}: -@example -mysql> SELECT "a" = "A"; - -> 1 -mysql> SELECT BINARY "a" = "A"; - -> 0 -@end example - -@code{BINARY string} is a shorthand for @code{CAST(string AS BINARY)}. -@xref{Cast Functions}. -@code{BINARY} was introduced in MySQL Version 3.23.0. - -Note that in some context MySQL will not be able to use the -index efficiently when you cast an indexed column to @code{BINARY}. -@end table - -If you want to compare a blob case-insensitively you can always convert -the blob to upper case before doing the comparison: - -@example -SELECT 'A' LIKE UPPER(blob_col) FROM table_name; -@end example - -We plan to soon introduce casting between different character sets to -make string comparison even more flexible. - - -@node Numeric Functions, Date and time functions, String functions, Functions -@subsection Numeric Functions - -@menu -* Arithmetic functions:: Arithmetic Operations -* Mathematical functions:: Mathematical Functions -@end menu - - -@node Arithmetic functions, Mathematical functions, Numeric Functions, Numeric Functions -@subsubsection Arithmetic Operations - -@cindex operators, cast -The usual arithmetic operators are available. Note that in the case of -@samp{-}, @samp{+}, and @samp{*}, the result is calculated with -@code{BIGINT} (64-bit) precision if both arguments are integers! -If one of the argument is an unsigned integer, and the other argument -is also an integer, the result will be an unsigned integer. -@xref{Cast Functions}. - -@cindex operations, arithmetic -@cindex arithmetic expressions -@table @code -@findex + (addition) -@findex addition (+) -@item + -Addition: -@example -mysql> SELECT 3+5; - -> 8 -@end example - -@findex - (subtraction) -@findex subtraction (-) -@item - -Subtraction: -@example -mysql> SELECT 3-5; - -> -2 -@end example - -@findex * (multiplication) -@findex multiplication (*) -@item * -Multiplication: -@example -mysql> SELECT 3*5; - -> 15 -mysql> SELECT 18014398509481984*18014398509481984.0; - -> 324518553658426726783156020576256.0 -mysql> SELECT 18014398509481984*18014398509481984; - -> 0 -@end example - -The result of the last expression is incorrect because the result of the -integer multiplication exceeds the 64-bit range of @code{BIGINT} -calculations. - -@findex / (division) -@findex division (/) -@item / -Division: -@example -mysql> SELECT 3/5; - -> 0.60 -@end example - -Division by zero produces a @code{NULL} result: - -@example -mysql> SELECT 102/(1-1); - -> NULL -@end example - -A division will be calculated with @code{BIGINT} arithmetic only if performed -in a context where its result is converted to an integer! -@end table - - -@node Mathematical functions, , Arithmetic functions, Numeric Functions -@subsubsection Mathematical Functions -All mathematical functions return @code{NULL} in case of an error. - -@findex mathematical functions -@findex functions, mathematical - -@table @code -@findex - (unary minus) -@findex minus, unary (-) -@findex unary minus (-) -@item - -Unary minus. Changes the sign of the argument: -@example -mysql> SELECT - 2; - -> -2 -@end example - -Note that if this operator is used with a @code{BIGINT}, the return value is a -@code{BIGINT}! This means that you should avoid using @code{-} on integers that -may have the value of @code{-2^63}! - -@findex ABS() -@item ABS(X) -Returns the absolute value of @code{X}: -@example -mysql> SELECT ABS(2); - -> 2 -mysql> SELECT ABS(-32); - -> 32 -@end example - -This function is safe to use with @code{BIGINT} values. - -@findex SIGN() -@item SIGN(X) -Returns the sign of the argument as @code{-1}, @code{0}, or @code{1}, depending -on whether @code{X} is negative, zero, or positive: -@example -mysql> SELECT SIGN(-32); - -> -1 -mysql> SELECT SIGN(0); - -> 0 -mysql> SELECT SIGN(234); - -> 1 -@end example - -@findex MOD() -@findex % (modulo) -@findex modulo (%) -@item MOD(N,M) -@itemx % -Modulo (like the @code{%} operator in C). -Returns the remainder of @code{N} divided by @code{M}: -@example -mysql> SELECT MOD(234, 10); - -> 4 -mysql> SELECT 253 % 7; - -> 1 -mysql> SELECT MOD(29,9); - -> 2 -@end example - -This function is safe to use with @code{BIGINT} values. - -@findex FLOOR() -@item FLOOR(X) -Returns the largest integer value not greater than @code{X}: -@example -mysql> SELECT FLOOR(1.23); - -> 1 -mysql> SELECT FLOOR(-1.23); - -> -2 -@end example - -Note that the return value is converted to a @code{BIGINT}! - -@findex CEILING() -@item CEILING(X) -Returns the smallest integer value not less than @code{X}: -@example -mysql> SELECT CEILING(1.23); - -> 2 -mysql> SELECT CEILING(-1.23); - -> -1 -@end example - -Note that the return value is converted to a @code{BIGINT}! - -@findex ROUND() -@item ROUND(X) -Returns the argument @code{X}, rounded to the nearest integer: -@example -mysql> SELECT ROUND(-1.23); - -> -1 -mysql> SELECT ROUND(-1.58); - -> -2 -mysql> SELECT ROUND(1.58); - -> 2 -@end example - -Note that the behaviour of @code{ROUND()} when the argument -is half way between two integers depends on the C library -implementation. Some round to the nearest even number, -always up, always down, or always toward zero. If you need -one kind of rounding, you should use a well-defined function -like @code{TRUNCATE()} or @code{FLOOR()} instead. - -@findex ROUND() -@item ROUND(X,D) -Returns the argument @code{X}, rounded to a number with @code{D} decimals. -If @code{D} is @code{0}, the result will have no decimal point or fractional -part: - -@example -mysql> SELECT ROUND(1.298, 1); - -> 1.3 -mysql> SELECT ROUND(1.298, 0); - -> 1 -@end example - -@findex EXP() -@item EXP(X) -Returns the value of @code{e} (the base of natural logarithms) raised to -the power of @code{X}: -@example -mysql> SELECT EXP(2); - -> 7.389056 -mysql> SELECT EXP(-2); - -> 0.135335 -@end example - -@findex LN() -@item LN(X) -Returns the natural logarithm of @code{X}: -@example -mysql> SELECT LN(2); - -> 0.693147 -mysql> SELECT LN(-2); - -> NULL -@end example - -This function was added in MySQL version 4.0.3. -It is synonymous with @code{LOG(X)} in MySQL. - -@findex LOG() -@item LOG(X) -@itemx LOG(B,X) -If called with one parameter, this function returns the natural logarithm -of @code{X}: -@example -mysql> SELECT LOG(2); - -> 0.693147 -mysql> SELECT LOG(-2); - -> NULL -@end example - -If called with two parameters, this function returns the logarithm of -@code{X} for an arbitary base @code{B}: -@example -mysql> SELECT LOG(2,65536); - -> 16.000000 -mysql> SELECT LOG(1,100); - -> NULL -@end example - -The arbitrary base option was added in MySQL version 4.0.3. -@code{LOG(B,X)} is equivalent to @code{LOG(X)/LOG(B)}. - -@findex LOG2() -@item LOG2(X) -Returns the base-2 logarithm of @code{X}: -@example -mysql> SELECT LOG2(65536); - -> 16.000000 -mysql> SELECT LOG2(-100); - -> NULL -@end example - -@code{LOG2()} is useful for finding out how many bits a number would -require for storage. -This function was added in MySQL version 4.0.3. -In earlier versions, you can use @code{LOG(X)/LOG(2)} instead. - -@findex LOG10() -@item LOG10(X) -Returns the base-10 logarithm of @code{X}: -@example -mysql> SELECT LOG10(2); - -> 0.301030 -mysql> SELECT LOG10(100); - -> 2.000000 -mysql> SELECT LOG10(-100); - -> NULL -@end example - -@findex POW() -@findex POWER() -@item POW(X,Y) -@itemx POWER(X,Y) -Returns the value of @code{X} raised to the power of @code{Y}: -@example -mysql> SELECT POW(2,2); - -> 4.000000 -mysql> SELECT POW(2,-2); - -> 0.250000 -@end example - -@findex SQRT() -@item SQRT(X) -Returns the non-negative square root of @code{X}: -@example -mysql> SELECT SQRT(4); - -> 2.000000 -mysql> SELECT SQRT(20); - -> 4.472136 -@end example - -@findex PI() -@item PI() -Returns the value of PI. The default shown number of decimals is 5, but -MySQL internally uses the full double precession for PI. -@example -mysql> SELECT PI(); - -> 3.141593 -mysql> SELECT PI()+0.000000000000000000; - -> 3.141592653589793116 -@end example - -@findex COS() -@item COS(X) -Returns the cosine of @code{X}, where @code{X} is given in radians: -@example -mysql> SELECT COS(PI()); - -> -1.000000 -@end example - -@findex SIN() -@item SIN(X) -Returns the sine of @code{X}, where @code{X} is given in radians: -@example -mysql> SELECT SIN(PI()); - -> 0.000000 -@end example - -@findex TAN() -@item TAN(X) -Returns the tangent of @code{X}, where @code{X} is given in radians: -@example -mysql> SELECT TAN(PI()+1); - -> 1.557408 -@end example - -@findex ACOS() -@item ACOS(X) -Returns the arc cosine of @code{X}, that is, the value whose cosine is -@code{X}. Returns @code{NULL} if @code{X} is not in the range @code{-1} to -@code{1}: -@example -mysql> SELECT ACOS(1); - -> 0.000000 -mysql> SELECT ACOS(1.0001); - -> NULL -mysql> SELECT ACOS(0); - -> 1.570796 -@end example - -@findex ASIN() -@item ASIN(X) -Returns the arc sine of @code{X}, that is, the value whose sine is -@code{X}. Returns @code{NULL} if @code{X} is not in the range @code{-1} to -@code{1}: -@example -mysql> SELECT ASIN(0.2); - -> 0.201358 -mysql> SELECT ASIN('foo'); - -> 0.000000 -@end example - -@findex ATAN() -@item ATAN(X) -Returns the arc tangent of @code{X}, that is, the value whose tangent is -@code{X}: -@example -mysql> SELECT ATAN(2); - -> 1.107149 -mysql> SELECT ATAN(-2); - -> -1.107149 -@end example - -@findex ATAN2() -@item ATAN(Y,X) -@itemx ATAN2(Y,X) -Returns the arc tangent of the two variables @code{X} and @code{Y}. It is -similar to calculating the arc tangent of @code{Y / X}, except that the -signs of both arguments are used to determine the quadrant of the -result: -@example -mysql> SELECT ATAN(-2,2); - -> -0.785398 -mysql> SELECT ATAN2(PI(),0); - -> 1.570796 -@end example - -@findex COT() -@item COT(X) -Returns the cotangent of @code{X}: -@example -mysql> SELECT COT(12); - -> -1.57267341 -mysql> SELECT COT(0); - -> NULL -@end example - -@findex RAND() -@item RAND() -@itemx RAND(N) -Returns a random floating-point value in the range @code{0} to @code{1.0}. -If an integer argument @code{N} is specified, it is used as the seed value: -@example -mysql> SELECT RAND(); - -> 0.9233482386203 -mysql> SELECT RAND(20); - -> 0.15888261251047 -mysql> SELECT RAND(20); - -> 0.15888261251047 -mysql> SELECT RAND(); - -> 0.63553050033332 -mysql> SELECT RAND(); - -> 0.70100469486881 -@end example - -You can't use a column with @code{RAND()} values in an @code{ORDER BY} -clause, because @code{ORDER BY} would evaluate the column multiple times. -In MySQL Version 3.23, you can, however, do: -@code{SELECT * FROM table_name ORDER BY RAND()} - -This is useful to get a random sample of a set @code{SELECT * FROM -table1,table2 WHERE a=b AND c<d ORDER BY RAND() LIMIT 1000}. - -Note that a @code{RAND()} in a @code{WHERE} clause will be re-evaluated -every time the @code{WHERE} is executed. - -@code{RAND()} is not meant to be a perfect random generator, but instead a -fast way to generate ad hoc random numbers that will be portable between -platforms for the same MySQL version. - -@findex LEAST() -@item LEAST(X,Y,...) -With two or more arguments, returns the smallest (minimum-valued) argument. -The arguments are compared using the following rules: - -@itemize @bullet -@item -If the return value is used in an @code{INTEGER} context, or all arguments -are integer-valued, they are compared as integers. - -@item -If the return value is used in a @code{REAL} context, or all arguments are -real-valued, they are compared as reals. - -@item -If any argument is a case-sensitive string, the arguments are compared -as case-sensitive strings. - -@item -In other cases, the arguments are compared as case-insensitive strings: -@end itemize - -@example -mysql> SELECT LEAST(2,0); - -> 0 -mysql> SELECT LEAST(34.0,3.0,5.0,767.0); - -> 3.0 -mysql> SELECT LEAST("B","A","C"); - -> "A" -@end example -In MySQL versions prior to Version 3.22.5, you can use @code{MIN()} -instead of @code{LEAST}. - -@findex GREATEST() -@item GREATEST(X,Y,...) -Returns the largest (maximum-valued) argument. -The arguments are compared using the same rules as for @code{LEAST}: -@example -mysql> SELECT GREATEST(2,0); - -> 2 -mysql> SELECT GREATEST(34.0,3.0,5.0,767.0); - -> 767.0 -mysql> SELECT GREATEST("B","A","C"); - -> "C" -@end example -In MySQL versions prior to Version 3.22.5, you can use @code{MAX()} -instead of @code{GREATEST}. - -@findex DEGREES() -@item DEGREES(X) -Returns the argument @code{X}, converted from radians to degrees: -@example -mysql> SELECT DEGREES(PI()); - -> 180.000000 -@end example - -@findex RADIANS() -@item RADIANS(X) -Returns the argument @code{X}, converted from degrees to radians: -@example -mysql> SELECT RADIANS(90); - -> 1.570796 -@end example - -@findex TRUNCATE() -@item TRUNCATE(X,D) -Returns the number @code{X}, truncated to @code{D} decimals. If @code{D} -is @code{0}, the result will have no decimal point or fractional part: -@example -mysql> SELECT TRUNCATE(1.223,1); - -> 1.2 -mysql> SELECT TRUNCATE(1.999,1); - -> 1.9 -mysql> SELECT TRUNCATE(1.999,0); - -> 1 -mysql> SELECT TRUNCATE(-1.999,1); - -> -1.9 -@end example - -Starting from MySQL 3.23.51 all numbers are rounded towards zero. - -If @code{D} is negative, then the whole part of the number is zeroed out: - -@example -mysql> SELECT TRUNCATE(122,-2); - -> 100 -@end example - -Note that as decimal numbers are normally not stored as exact numbers in -computers, but as double values, you may be fooled by the following -result: - -@cindex rounding errors -@example -mysql> SELECT TRUNCATE(10.28*100,0); - -> 1027 -@end example - -The above happens because 10.28 is actually stored as something like -10.2799999999999999. -@end table - -@node Date and time functions, Cast Functions, Numeric Functions, Functions -@subsection Date and Time Functions - -@findex date and time functions -@findex functions, date and time - -See @ref{Date and time types} for a description of the range of values -each type has and the valid formats in which date and time values may be -specified. - -Here is an example that uses date functions. The following query selects -all records with a @code{date_col} value from within the last 30 days: - -@example -mysql> SELECT something FROM tbl_name - WHERE TO_DAYS(NOW()) - TO_DAYS(date_col) <= 30; -@end example - -@table @code -@findex DAYOFWEEK() -@item DAYOFWEEK(date) -Returns the weekday index - -for @code{date} (@code{1} = Sunday, @code{2} = Monday, ... @code{7} = -Saturday). These index values correspond to the ODBC standard: - -@example -mysql> SELECT DAYOFWEEK('1998-02-03'); - -> 3 -@end example - -@findex WEEKDAY() -@item WEEKDAY(date) -Returns the weekday index for -@code{date} (@code{0} = Monday, @code{1} = Tuesday, ... @code{6} = Sunday): - -@example -mysql> SELECT WEEKDAY('1997-10-04 22:23:00'); - -> 5 -mysql> SELECT WEEKDAY('1997-11-05'); - -> 2 -@end example - -@findex DAYOFMONTH() -@item DAYOFMONTH(date) -Returns the day of the month for @code{date}, in the range @code{1} to -@code{31}: - -@example -mysql> SELECT DAYOFMONTH('1998-02-03'); - -> 3 -@end example - -@findex DAYOFYEAR() -@item DAYOFYEAR(date) -Returns the day of the year for @code{date}, in the range @code{1} to -@code{366}: - -@example -mysql> SELECT DAYOFYEAR('1998-02-03'); - -> 34 -@end example - -@findex MONTH() -@item MONTH(date) -Returns the month for @code{date}, in the range @code{1} to @code{12}: - -@example -mysql> SELECT MONTH('1998-02-03'); - -> 2 -@end example - -@findex DAYNAME() -@item DAYNAME(date) -Returns the name of the weekday for @code{date}: - -@example -mysql> SELECT DAYNAME("1998-02-05"); - -> 'Thursday' -@end example - -@findex MONTHNAME() -@item MONTHNAME(date) -Returns the name of the month for @code{date}: - -@example -mysql> SELECT MONTHNAME("1998-02-05"); - -> 'February' -@end example - -@findex QUARTER() -@item QUARTER(date) -Returns the quarter of the year for @code{date}, in the range @code{1} -to @code{4}: - -@example -mysql> SELECT QUARTER('98-04-01'); - -> 2 -@end example - -@findex WEEK() -@item WEEK(date) -@itemx WEEK(date,first) -With a single argument, returns the week for @code{date}, in the range -@code{0} to @code{53} (yes, there may be the beginnings of a week 53), -for locations where Sunday is the first day of the week. The -two-argument form of @code{WEEK()} allows you to specify whether the -week starts on Sunday or Monday. The week starts on Sunday if the -second argument is @code{0}, on Monday if the second argument is -@code{1}: - -@example -mysql> SELECT WEEK('1998-02-20'); - -> 7 -mysql> SELECT WEEK('1998-02-20',0); - -> 7 -mysql> SELECT WEEK('1998-02-20',1); - -> 8 -mysql> SELECT WEEK('1998-12-31',1); - -> 53 -@end example - -Note: in Version 4.0, @code{WEEK(#,0)} was changed to match the -calendar in the USA. - -Note that if a week is the last week of the previous year, MySQL will -return 0: - -@example -mysql> SELECT YEAR('2000-01-01'), WEEK('2000-01-01',0); - -> 2000, 0 -@end example - -One could argue that MySQL should return @code{52} for the @code{WEEK()} -function as the given date is actually the 52 second week of 1999. We -decided to return 0 instead as we want the function to return 'the week -number in the given year'. This makes the usage of the @code{WEEK()} -function reliable when combined with other functions that extracts a -date part from a date. - -If you would prefer to know the correct year-week, then you should use -the @code{YEARWEEK()} function instead: - -@example -mysql> SELECT YEARWEEK('2000-01-01'); - -> 199952 -mysql> SELECT MID(YEARWEEK('2000-01-01'),5,2); - -> 52 -@end example - -@findex YEAR() -@item YEAR(date) -Returns the year for @code{date}, in the range @code{1000} to @code{9999}: - -@example -mysql> SELECT YEAR('98-02-03'); - -> 1998 -@end example - -@item YEARWEEK(date) -@itemx YEARWEEK(date,first) -Returns year and week for a date. The second arguments works exactly -like the second argument to @code{WEEK()}. Note that the year may be -different from the year in the date argument for the first and the last -week of the year: - -@example -mysql> SELECT YEARWEEK('1987-01-01'); - -> 198653 -@end example - -Note that the week number is different from what the @code{WEEK()} function -would return (@code{0}) as @code{WEEK()} returns the week in the -context of the given year. - -@findex HOUR() -@item HOUR(time) -Returns the hour for @code{time}, in the range @code{0} to @code{23}: - -@example -mysql> SELECT HOUR('10:05:03'); - -> 10 -@end example - -@findex MINUTE() -@item MINUTE(time) -Returns the minute for @code{time}, in the range @code{0} to @code{59}: - -@example -mysql> SELECT MINUTE('98-02-03 10:05:03'); - -> 5 -@end example - -@findex SECOND() -@item SECOND(time) -Returns the second for @code{time}, in the range @code{0} to @code{59}: - -@example -mysql> SELECT SECOND('10:05:03'); - -> 3 -@end example - -@findex PERIOD_ADD() -@item PERIOD_ADD(P,N) -Adds @code{N} months to period @code{P} (in the format @code{YYMM} or -@code{YYYYMM}). Returns a value in the format @code{YYYYMM}. - -Note that the period argument @code{P} is @strong{not} a date value: - -@example -mysql> SELECT PERIOD_ADD(9801,2); - -> 199803 -@end example - -@findex PERIOD_DIFF() -@item PERIOD_DIFF(P1,P2) -Returns the number of months between periods @code{P1} and @code{P2}. -@code{P1} and @code{P2} should be in the format @code{YYMM} or @code{YYYYMM}. - -Note that the period arguments @code{P1} and @code{P2} are @strong{not} -date values: - -@example -mysql> SELECT PERIOD_DIFF(9802,199703); - -> 11 -@end example - -@findex DATE_ADD() -@findex DATE_SUB() -@findex ADDDATE() -@findex SUBDATE() -@findex EXTRACT() -@item DATE_ADD(date,INTERVAL expr type) -@itemx DATE_SUB(date,INTERVAL expr type) -@itemx ADDDATE(date,INTERVAL expr type) -@itemx SUBDATE(date,INTERVAL expr type) - -These functions perform date arithmetic. They are new for MySQL -Version 3.22. @code{ADDDATE()} and @code{SUBDATE()} are synonyms for -@code{DATE_ADD()} and @code{DATE_SUB()}. - -In MySQL Version 3.23, you can use @code{+} and @code{-} instead of -@code{DATE_ADD()} and @code{DATE_SUB()} if the expression on the right side is -a date or datetime column. (See example below.) - -@code{date} is a @code{DATETIME} or @code{DATE} value specifying the starting -date. @code{expr} is an expression specifying the interval value to be added -or subtracted from the starting date. @code{expr} is a string; it may start -with a @samp{-} for negative intervals. @code{type} is a keyword indicating -how the expression should be interpreted. - -The related function @code{EXTRACT(type FROM date)} returns the 'type' -interval from the date. - -The following table shows how the @code{type} and @code{expr} arguments -are related: - -@multitable @columnfractions .25 .45 -@item @code{type} @strong{value} @tab @strong{Expected} @code{expr} @strong{format} -@item @code{SECOND} @tab @code{SECONDS} -@item @code{MINUTE} @tab @code{MINUTES} -@item @code{HOUR} @tab @code{HOURS} -@item @code{DAY} @tab @code{DAYS} -@item @code{MONTH} @tab @code{MONTHS} -@item @code{YEAR} @tab @code{YEARS} -@item @code{MINUTE_SECOND} @tab @code{"MINUTES:SECONDS"} -@item @code{HOUR_MINUTE} @tab @code{"HOURS:MINUTES"} -@item @code{DAY_HOUR} @tab @code{"DAYS HOURS"} -@item @code{YEAR_MONTH} @tab @code{"YEARS-MONTHS"} -@item @code{HOUR_SECOND} @tab @code{"HOURS:MINUTES:SECONDS"} -@item @code{DAY_MINUTE} @tab @code{"DAYS HOURS:MINUTES"} -@item @code{DAY_SECOND} @tab @code{"DAYS HOURS:MINUTES:SECONDS"} -@end multitable - -MySQL allows any punctuation delimiter in the @code{expr} format. -Those shown in the table are the suggested delimiters. If the @code{date} -argument is a @code{DATE} value and your calculations involve only -@code{YEAR}, @code{MONTH}, and @code{DAY} parts (that is, no time parts), the -result is a @code{DATE} value. Otherwise, the result is a @code{DATETIME} -value: - -@example -mysql> SELECT "1997-12-31 23:59:59" + INTERVAL 1 SECOND; - -> 1998-01-01 00:00:00 -mysql> SELECT INTERVAL 1 DAY + "1997-12-31"; - -> 1998-01-01 -mysql> SELECT "1998-01-01" - INTERVAL 1 SECOND; - -> 1997-12-31 23:59:59 -mysql> SELECT DATE_ADD("1997-12-31 23:59:59", - -> INTERVAL 1 SECOND); - -> 1998-01-01 00:00:00 -mysql> SELECT DATE_ADD("1997-12-31 23:59:59", - -> INTERVAL 1 DAY); - -> 1998-01-01 23:59:59 -mysql> SELECT DATE_ADD("1997-12-31 23:59:59", - -> INTERVAL "1:1" MINUTE_SECOND); - -> 1998-01-01 00:01:00 -mysql> SELECT DATE_SUB("1998-01-01 00:00:00", - -> INTERVAL "1 1:1:1" DAY_SECOND); - -> 1997-12-30 22:58:59 -mysql> SELECT DATE_ADD("1998-01-01 00:00:00", - -> INTERVAL "-1 10" DAY_HOUR); - -> 1997-12-30 14:00:00 -mysql> SELECT DATE_SUB("1998-01-02", INTERVAL 31 DAY); - -> 1997-12-02 -@end example - -If you specify an interval value that is too short (does not include all the -interval parts that would be expected from the @code{type} keyword), -MySQL assumes you have left out the leftmost parts of the interval -value. For example, if you specify a @code{type} of @code{DAY_SECOND}, the -value of @code{expr} is expected to have days, hours, minutes, and seconds -parts. If you specify a value like @code{"1:10"}, MySQL assumes -that the days and hours parts are missing and the value represents minutes -and seconds. In other words, @code{"1:10" DAY_SECOND} is interpreted in such -a way that it is equivalent to @code{"1:10" MINUTE_SECOND}. This is -analogous to the way that MySQL interprets @code{TIME} values -as representing elapsed time rather than as time of day. - -Note that if you add or subtract a date value against something that -contains a time part, the date value will be automatically converted to a -datetime value: - -@example -mysql> SELECT DATE_ADD("1999-01-01", INTERVAL 1 DAY); - -> 1999-01-02 -mysql> SELECT DATE_ADD("1999-01-01", INTERVAL 1 HOUR); - -> 1999-01-01 01:00:00 -@end example - -If you use really incorrect dates, the result is @code{NULL}. If you add -@code{MONTH}, @code{YEAR_MONTH}, or @code{YEAR} and the resulting date -has a day that is larger than the maximum day for the new month, the day is -adjusted to the maximum days in the new month: - -@example -mysql> SELECT DATE_ADD('1998-01-30', INTERVAL 1 MONTH); - -> 1998-02-28 -@end example - -Note from the preceding example that the word @code{INTERVAL} and the -@code{type} keyword are not case-sensitive. - -@findex EXTRACT() -@item EXTRACT(type FROM date) - -The @code{EXTRACT()} function uses the same kinds of interval type -specifiers as @code{DATE_ADD()} or @code{DATE_SUB()}, but extracts parts -from the date rather than performing date arithmetic. - -@example -mysql> SELECT EXTRACT(YEAR FROM "1999-07-02"); - -> 1999 -mysql> SELECT EXTRACT(YEAR_MONTH FROM "1999-07-02 01:02:03"); - -> 199907 -mysql> SELECT EXTRACT(DAY_MINUTE FROM "1999-07-02 01:02:03"); - -> 20102 -@end example - -@findex TO_DAYS() -@item TO_DAYS(date) -Given a date @code{date}, returns a daynumber (the number of days since year -0): - -@example -mysql> SELECT TO_DAYS(950501); - -> 728779 -mysql> SELECT TO_DAYS('1997-10-07'); - -> 729669 -@end example - -@code{TO_DAYS()} is not intended for use with values that precede the advent -of the Gregorian calendar (1582), because it doesn't take into account the -days that were lost when the calendar was changed. - -@findex FROM_DAYS() -@item FROM_DAYS(N) -Given a daynumber @code{N}, returns a @code{DATE} value: - -@example -mysql> SELECT FROM_DAYS(729669); - -> '1997-10-07' -@end example - -@code{FROM_DAYS()} is not intended for use with values that precede the -advent of the Gregorian calendar (1582), because it doesn't take into account -the days that were lost when the calendar was changed. - -@findex DATE_FORMAT() -@item DATE_FORMAT(date,format) -Formats the @code{date} value according to the @code{format} string. The -following specifiers may be used in the @code{format} string: -@multitable @columnfractions .10 .65 -@item @strong{Specifier} @tab @strong{Description} -@item @code{%M} @tab Month name (@code{January}..@code{December}) -@item @code{%W} @tab Weekday name (@code{Sunday}..@code{Saturday}) -@item @code{%D} @tab Day of the month with English suffix (@code{1st}, @code{2nd}, @code{3rd}, etc.) -@item @code{%Y} @tab Year, numeric, 4 digits -@item @code{%y} @tab Year, numeric, 2 digits -@item @code{%X} @tab Year for the week where Sunday is the first day of the week, numeric, 4 digits, used with '%V' -@item @code{%x} @tab Year for the week, where Monday is the first day of the week, numeric, 4 digits, used with '%v' -@item @code{%a} @tab Abbreviated weekday name (@code{Sun}..@code{Sat}) -@item @code{%d} @tab Day of the month, numeric (@code{00}..@code{31}) -@item @code{%e} @tab Day of the month, numeric (@code{0}..@code{31}) -@item @code{%m} @tab Month, numeric (@code{01}..@code{12}) -@item @code{%c} @tab Month, numeric (@code{1}..@code{12}) -@item @code{%b} @tab Abbreviated month name (@code{Jan}..@code{Dec}) -@item @code{%j} @tab Day of year (@code{001}..@code{366}) -@item @code{%H} @tab Hour (@code{00}..@code{23}) -@item @code{%k} @tab Hour (@code{0}..@code{23}) -@item @code{%h} @tab Hour (@code{01}..@code{12}) -@item @code{%I} @tab Hour (@code{01}..@code{12}) -@item @code{%l} @tab Hour (@code{1}..@code{12}) -@item @code{%i} @tab Minutes, numeric (@code{00}..@code{59}) -@item @code{%r} @tab Time, 12-hour (@code{hh:mm:ss [AP]M}) -@item @code{%T} @tab Time, 24-hour (@code{hh:mm:ss}) -@item @code{%S} @tab Seconds (@code{00}..@code{59}) -@item @code{%s} @tab Seconds (@code{00}..@code{59}) -@item @code{%p} @tab @code{AM} or @code{PM} -@item @code{%w} @tab Day of the week (@code{0}=Sunday..@code{6}=Saturday) -@item @code{%U} @tab Week (@code{00}..@code{53}), where Sunday is the first day of the week -@item @code{%u} @tab Week (@code{00}..@code{53}), where Monday is the first day of the week -@item @code{%V} @tab Week (@code{01}..@code{53}), where Sunday is the first day of the week. Used with '%X' -@item @code{%v} @tab Week (@code{01}..@code{53}), where Monday is the first day of the week. Used with '%x' -@item @code{%%} @tab A literal @samp{%}. -@end multitable - -All other characters are just copied to the result without interpretation: - -@example -mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00', '%W %M %Y'); - -> 'Saturday October 1997' -mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00', '%H:%i:%s'); - -> '22:23:00' -mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00', - '%D %y %a %d %m %b %j'); - -> '4th 97 Sat 04 10 Oct 277' -mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00', - '%H %k %I %r %T %S %w'); - -> '22 22 10 10:23:00 PM 22:23:00 00 6' -mysql> SELECT DATE_FORMAT('1999-01-01', '%X %V'); - -> '1998 52' -@end example - -As of MySQL Version 3.23, the @samp{%} character is required before -format specifier characters. In earlier versions of MySQL, -@samp{%} was optional. - -@findex TIME_FORMAT() -@item TIME_FORMAT(time,format) -This is used like the @code{DATE_FORMAT()} function above, but the -@code{format} string may contain only those format specifiers that handle -hours, minutes, and seconds. Other specifiers produce a @code{NULL} value or -@code{0}. - -@findex CURDATE() -@findex CURRENT_DATE -@item CURDATE() -@itemx CURRENT_DATE -Returns today's date as a value in @code{'YYYY-MM-DD'} or @code{YYYYMMDD} -format, depending on whether the function is used in a string or numeric -context: - -@example -mysql> SELECT CURDATE(); - -> '1997-12-15' -mysql> SELECT CURDATE() + 0; - -> 19971215 -@end example - -@findex CURTIME() -@findex CURRENT_TIME -@item CURTIME() -@itemx CURRENT_TIME -Returns the current time as a value in @code{'HH:MM:SS'} or @code{HHMMSS} -format, depending on whether the function is used in a string or numeric -context: - -@example -mysql> SELECT CURTIME(); - -> '23:50:26' -mysql> SELECT CURTIME() + 0; - -> 235026 -@end example - -@findex NOW() -@findex SYSDATE() -@findex CURRENT_TIMESTAMP -@item NOW() -@itemx SYSDATE() -@itemx CURRENT_TIMESTAMP -Returns the current date and time as a value in @code{'YYYY-MM-DD HH:MM:SS'} -or @code{YYYYMMDDHHMMSS} format, depending on whether the function is used in -a string or numeric context: - -@example -mysql> SELECT NOW(); - -> '1997-12-15 23:50:26' -mysql> SELECT NOW() + 0; - -> 19971215235026 -@end example - -Note that @code{NOW()} is only evaluated once per query, namely at the -start of query execution. This means that multiple references to -@code{NOW()} within a single query will always give the same time. - -@findex UNIX_TIMESTAMP() -@item UNIX_TIMESTAMP() -@itemx UNIX_TIMESTAMP(date) -If called with no argument, returns a Unix timestamp (seconds since -@code{'1970-01-01 00:00:00'} GMT) as an unsigned integer. If -@code{UNIX_TIMESTAMP()} is called with a @code{date} argument, it -returns the value of the argument as seconds since @code{'1970-01-01 -00:00:00'} GMT. @code{date} may be a @code{DATE} string, a -@code{DATETIME} string, a @code{TIMESTAMP}, or a number in the format -@code{YYMMDD} or @code{YYYYMMDD} in local time: - -@example -mysql> SELECT UNIX_TIMESTAMP(); - -> 882226357 -mysql> SELECT UNIX_TIMESTAMP('1997-10-04 22:23:00'); - -> 875996580 -@end example - -When @code{UNIX_TIMESTAMP} is used on a @code{TIMESTAMP} column, the function -will return the internal timestamp value directly, with no implicit -``string-to-unix-timestamp'' conversion. -If you pass an out-of-range date to @code{UNIX_TIMESTAMP()} it will -return 0, but please note that only basic checking is performed -(year 1970-2037, month 01-12, day 01-31). - -If you want to subtract @code{UNIX_TIMESTAMP()} columns, you may want to -cast the result to signed integers. @xref{Cast Functions}. - -@findex FROM_UNIXTIME() -@item FROM_UNIXTIME(unix_timestamp) -Returns a representation of the @code{unix_timestamp} argument as a value in -@code{'YYYY-MM-DD HH:MM:SS'} or @code{YYYYMMDDHHMMSS} format, depending on -whether the function is used in a string or numeric context: - -@example -mysql> SELECT FROM_UNIXTIME(875996580); - -> '1997-10-04 22:23:00' -mysql> SELECT FROM_UNIXTIME(875996580) + 0; - -> 19971004222300 -@end example - -@findex FROM_UNIXTIME() -@item FROM_UNIXTIME(unix_timestamp,format) -Returns a string representation of the Unix timestamp, formatted according to -the @code{format} string. @code{format} may contain the same specifiers as -those listed in the entry for the @code{DATE_FORMAT()} function: - -@example -mysql> SELECT FROM_UNIXTIME(UNIX_TIMESTAMP(), - '%Y %D %M %h:%i:%s %x'); - -> '1997 23rd December 03:43:30 1997' -@end example - -@findex SEC_TO_TIME() -@item SEC_TO_TIME(seconds) -Returns the @code{seconds} argument, converted to hours, minutes, and seconds, -as a value in @code{'HH:MM:SS'} or @code{HHMMSS} format, depending on whether -the function is used in a string or numeric context: - -@example -mysql> SELECT SEC_TO_TIME(2378); - -> '00:39:38' -mysql> SELECT SEC_TO_TIME(2378) + 0; - -> 3938 -@end example - -@findex TIME_TO_SEC() -@item TIME_TO_SEC(time) -Returns the @code{time} argument, converted to seconds: - -@example -mysql> SELECT TIME_TO_SEC('22:23:00'); - -> 80580 -mysql> SELECT TIME_TO_SEC('00:39:38'); - -> 2378 -@end example -@end table - -@node Cast Functions, Other Functions, Date and time functions, Functions -@subsection Cast Functions - -The syntax of the @code{CAST} function is: - -@findex CAST -@findex CONVERT - -@example -CAST(expression AS type) - -or - -CONVERT(expression,type) -@end example - -Where type is one of: -@itemize @bullet -@item -@code{BINARY} -@item -@code{DATE} -@item -@code{DATETIME} -@item -@code{SIGNED @{INTEGER@}} -@item -@code{TIME} -@item -@code{UNSIGNED @{INTEGER@}} -@end itemize - -@code{CAST()} is ANSI SQL99 syntax and @code{CONVERT()} is ODBC syntax. - -The cast function is mainly useful when you want to create a column with -a specific type in a @code{CREATE ... SELECT}: - -@example -CREATE TABLE new_table SELECT CAST('2000-01-01' AS DATE); -@end example - -@code{CAST(string AS BINARY} is the same thing as @code{BINARY string}. - -To cast a string to a numeric value, you don't normally have to do -anything; just use the string value as it would be a number: - -@example -mysql> SELECT 1+'1'; - -> 2 -@end example - -If you use a number in string context the number will automaticly be -converted to a @code{BINARY} string. - -mysql> SELECT concat("hello you ",2); - -> "hello you 2" - -MySQL supports arithmetic with both signed and unsigned 64-bit values. -If you are using an numerical operations (like @code{+}) and one of the -operands are @code{unsigned integer}, then the result will be unsigned. -You can override this by using the @code{SIGNED} and @code{UNSIGNED} -cast operators, which will cast the operation to a signed or -unsigned 64-bit integer, respectively. - -@example -mysql> SELECT CAST(1-2 AS UNSIGNED) - -> 18446744073709551615 -mysql> SELECT CAST(CAST(1-2 AS UNSIGNED) AS SIGNED); - -> -1 -@end example - -Note that if either operation is a floating-point value (In this context -@code{DECIMAL()} is regarded as a floating-point value) the result will -be a floating-point value and is not affected by the above rule. - -@example -mysql> SELECT CAST(1 AS UNSIGNED) -2.0 - -> -1.0 -@end example - -If you are using a string in an arithmetic operation, this is converted -to a floating-point number. - -The @code{CAST()} and @code{CONVERT()} functions were added in MySQL 4.0.2. - -The handing of unsigned values was changed in MySQL 4.0 to be able to -support @code{BIGINT} values properly. If you have some code that you -want to run in both MySQL 4.0 and 3.23 (in which case you probably can't -use the CAST function), you can use the following trick to get a signed -result when subtracting two unsigned integer columns: - -@example -SELECT (unsigned_column_1+0.0)-(unsigned_column_2+0.0); -@end example - -The idea is that the columns are converted to floating-point before doing -the subtraction. - -If you get a problem with @code{UNSIGNED} columns in your old MySQL -application when porting to MySQL 4.0, you can use the -@code{--sql-mode=NO_UNSIGNED_SUBTRACTION} option when starting -@code{mysqld}. Note however that as long as you use this, you will not -be able to make efficient use of the @code{UNSIGNED BIGINT} column type. - -@node Other Functions, Group by functions, Cast Functions, Functions -@subsection Other Functions - -@menu -* Bit functions:: Bit Functions -* Miscellaneous functions:: Miscellaneous Functions -@end menu - - -@node Bit functions, Miscellaneous functions, Other Functions, Other Functions -@subsubsection Bit Functions - -@findex arithmetic functions -@findex bit functions -@findex functions, arithmetic -@findex functions, bit - -MySQL uses @code{BIGINT} (64-bit) arithmetic for bit operations, so -these operators have a maximum range of 64 bits. - -@table @code -@findex | (bitwise OR) -@findex OR, bitwise -@item | -Bitwise OR -@example -mysql> SELECT 29 | 15; - -> 31 -@end example - -The result is an unsigned 64-bit integer. - -@findex & (bitwise AND) -@findex AND, bitwise -@item & -Bitwise AND -@example -mysql> SELECT 29 & 15; - -> 13 -@end example - -The result is an unsigned 64-bit integer. - -@findex ^ (bitwise XOR) -@findex XOR, bitwise -@item ^ -Bitwise XOR -@example -mysql> SELECT 1 ^ 1; - -> 0 -mysql> SELECT 1 ^ 0; - -> 1 -mysql> SELECT 11 ^ 3; - -> 8 -@end example - -The result is an unsigned 64-bit integer. - -@findex << (left shift) -@item << -Shifts a longlong (@code{BIGINT}) number to the left: -@example -mysql> SELECT 1 << 2; - -> 4 -@end example - -The result is an unsigned 64-bit integer. - -@findex >> (right shift) -@item >> -Shifts a longlong (@code{BIGINT}) number to the right: -@example -mysql> SELECT 4 >> 2; - -> 1 -@end example - -The result is an unsigned 64-bit integer. - -@findex ~ -@item ~ -Invert all bits: -@example -mysql> SELECT 5 & ~1; - -> 4 -@end example - -The result is an unsigned 64-bit integer. - -@findex BIT_COUNT() -@item BIT_COUNT(N) -Returns the number of bits that are set in the argument @code{N}: -@example -mysql> SELECT BIT_COUNT(29); - -> 4 -@end example -@end table - - -@node Miscellaneous functions, , Bit functions, Other Functions -@subsubsection Miscellaneous Functions - -@findex miscellaneous functions -@findex functions, miscellaneous - -@table @code -@findex DATABASE() -@item DATABASE() -Returns the current database name: - -@example -mysql> SELECT DATABASE(); - -> 'test' -@end example - -If there is no current database, @code{DATABASE()} returns the empty string. - -@findex USER() -@findex SYSTEM_USER() -@findex SESSION_USER() -@item USER() -@itemx SYSTEM_USER() -@itemx SESSION_USER() -Returns the current MySQL user name: - -@example -mysql> SELECT USER(); - -> 'davida@@localhost' -@end example - -In MySQL Version 3.22.11 or later, this includes the client hostname -as well as the user name. You can extract just the user name part like this -(which works whether the value includes a hostname part): - -@example -mysql> SELECT SUBSTRING_INDEX(USER(),"@@",1); - -> 'davida' -@end example - -@findex PASSWORD() -@item PASSWORD(str) -Calculates a password string from the plaintext password @code{str}. This is -the function that is used for encrypting MySQL passwords for storage -in the @code{Password} column of the @code{user} grant table: - -@example -mysql> SELECT PASSWORD('badpwd'); - -> '7f84554057dd964b' -@end example - -@cindex password encryption, reversibility of -@code{PASSWORD()} encryption is non-reversible. - -@code{PASSWORD()} does not perform password encryption in the same way that -Unix passwords are encrypted. You should not assume that if your Unix -password and your MySQL password are the same, @code{PASSWORD()} -will result in the same encrypted value as is stored in the Unix password -file. See @code{ENCRYPT()}. - -@findex ENCRYPT() -@item ENCRYPT(str[,salt]) -Encrypt @code{str} using the Unix @code{crypt()} system call. The -@code{salt} argument should be a string with two characters. -(As of MySQL Version 3.22.16, @code{salt} may be longer than two characters.): - -@example -mysql> SELECT ENCRYPT("hello"); - -> 'VxuFAJXVARROc' -@end example - -If @code{crypt()} is not available on your system, @code{ENCRYPT()} always -returns @code{NULL}. - -@code{ENCRYPT()} ignores all but the first 8 characters of @code{str}, at -least on some systems. This will be determined by the behaviour of the -underlying @code{crypt()} system call. - -@findex ENCODE() -@item ENCODE(str,pass_str) -Encrypt @code{str} using @code{pass_str} as the password. -To decrypt the result, use @code{DECODE()}. - -The results is a binary string of the same length as @code{string}. -If you want to save it in a column, use a @code{BLOB} column type. - -@findex DECODE() -@item DECODE(crypt_str,pass_str) -Descrypts the encrypted string @code{crypt_str} using @code{pass_str} as the -password. @code{crypt_str} should be a string returned from -@code{ENCODE()}. - -@findex MD5() -@item MD5(string) -Calculates an MD5 128 bit checksum for the string. The value is returned -as a 32 digit hex number that may, for example, be used as a hash key: - -@example -mysql> SELECT MD5("testing"); - -> 'ae2b1fca515949e5d54fb22b8ed95575' -@end example - -This is the "RSA Data Security, Inc. MD5 Message-Digest Algorithm". - -@findex SHA1() -@findex SHA() -@item SHA1(string) -@itemx SHA(string) -Calculates an SHA1 160 bit checksum for the string, as described in -RFC 3174 (Secure Hash Algorithm). The value is returned as a 40 digit -hex number, or @code{NULL} in case the input argument was @code{NULL}. -One of the possible uses for this function is as a hash key. You can -also use it as cryptographically safe function for storing passwords. - -@example -mysql> SELECT SHA1("abc"); - -> 'a9993e364706816aba3e25717850c26c9cd0d89d' -@end example - -@code{SHA1()} was added in version 4.0.2, and can be considered -a cryptographically more secure equivalent of @code{MD5()}. -@code{SHA()} is synonym for @code{SHA1()}. - -@findex AES_ENCRYPT() -@findex AES_DECRYPT() -@item AES_ENCRYPT(string,key_string) -@itemx AES_DECRYPT(string,key_string) -These functions allow encryption/decryption of data using the official -AES (Advanced Encryption Standard) algorithm, previously known as Rijndael. -Encoding with 128 bit key length is used, but you can extend it up to -256 bit by patching the source. We chose 128 bits because it is much -faster and it is usually secure enough. - -The input arguments may be any length. If either argument is @code{NULL}, -the result of this function is also @code{NULL}. - -As AES is a block level algorithm, padding is used to encode uneven length -strings and so the result string length may be calculated as -16*(trunc(string_length/16)+1). - -If @code{AES_DECRYPT()} detects invalid data or incorrect padding, it -will return @code{NULL}. However, it is possible for @code{AES_DECRYPT()} -to return a non-@code{NULL} value (possibly garbage) if the input data or -the key was invalid. - -You can use the AES functions to store data in an encrypted form by -modifying your queries: -@example -INSERT INTO t VALUES (1,AES_ENCRYPT("text","password")); -@end example - -You can get even more security by avoiding transferring the key over the -connection for each query, which can be accomplished by storing it in a -server side variable at connection time: -@example -SELECT @@password:="my password"; -INSERT INTO t VALUES (1,AES_ENCRYPT("text",@@password)); -@end example - -@code{AES_ENCRYPT()} and @code{AES_DECRYPT()} were added in version 4.0.2, -and can be considered the most cryptographically secure encryption -functions currently available in MySQL. - -@findex DES_ENCRYPT() -@item DES_ENCRYPT(string_to_encrypt [, (key_number | key_string) ] ) - -Encrypts the string with the given key using the DES algorithm. - -Note that this function only works if you have configured MySQL with -SSL support. @xref{Secure connections}. - -The encryption key to use is chosen the following way: - -@multitable @columnfractions .25 .65 -@item @strong{Argument} @tab @strong{Description} -@item Only one argument @tab -The first key from @code{des-key-file} is used. -@item key number @tab -The given key (0-9) from the @code{des-key-file} is used. -@item string @tab -The given @code{key_string} will be used to crypt @code{string_to_encrypt}. -@end multitable - -The return string will be a binary string where the first character -will be @code{CHAR(128 | key_number)}. - -The 128 is added to make it easier to recognise an encrypted key. -If you use a string key, @code{key_number} will be 127. - -On error, this function returns @code{NULL}. - -The string length for the result will be -@code{new_length= org_length + (8-(org_length % 8))+1}. - -The @code{des-key-file} has the following format: - -@example -key_number des_key_string -key_number des_key_string -@end example - -Each @code{key_number} must be a number in the range from 0 to 9. Lines in -the file may be in any order. @code{des_key_string} is the string that -will be used to encrypt the message. Between the number and the key there -should be at least one space. The first key is the default key that will -be used if you don't specify any key argument to @code{DES_ENCRYPT()} - -You can tell MySQL to read new key values from the key file with the -@code{FLUSH DES_KEY_FILE} command. This requires the @code{Reload_priv} -privilege. - -One benefit of having a set of default keys is that it gives applications -a way to check for existence of encrypted column values, without giving -the end user the right to decrypt those values. - -@example -mysql> SELECT customer_address FROM customer_table WHERE - crypted_credit_card = DES_ENCRYPT("credit_card_number"); -@end example - -@findex DES_DECRYPT() -@item DES_DECRYPT(string_to_decrypt [, key_string]) - -Decrypts a string encrypted with @code{DES_ENCRYPT()}. - -Note that this function only works if you have configured MySQL with -SSL support. @xref{Secure connections}. - -If no @code{key_string} argument is given, @code{DES_DECRYPT()} examines -the first byte of the encrypted string to determine the DES key number -that was used to encrypt the original string, then reads the key -from the @code{des-key-file} to decrypt the message. For this to work -the user must have the @code{SUPER} privilege. - -If you pass this function a @code{key_string} argument, that string -is used as the key for decrypting the message. - -If the @code{string_to_decrypt} doesn't look like an encrypted string, MySQL -will return the given @code{string_to_decrypt}. - -On error, this function returns @code{NULL}. - -@findex LAST_INSERT_ID([expr]) -@item LAST_INSERT_ID([expr]) -Returns the last automatically generated value that was inserted into an -@code{AUTO_INCREMENT} column. -@xref{mysql_insert_id,, @code{mysql_insert_id()}}. - -@example -mysql> SELECT LAST_INSERT_ID(); - -> 195 -@end example - -The last ID that was generated is maintained in the server on a -per-connection basis. It will not be changed by another client. It will not -even be changed if you update another @code{AUTO_INCREMENT} column with a -non-magic value (that is, a value that is not @code{NULL} and not @code{0}). - -If you insert many rows at the same time with an insert statement, -@code{LAST_INSERT_ID()} returns the value for the first inserted row. -The reason for this is to make it possible to easily reproduce -the same @code{INSERT} statement against some other server. - -@cindex sequence emulation -If @code{expr} is given as an argument to @code{LAST_INSERT_ID()}, then -the value of the argument is returned by the function, and is set as the -next value to be returned by @code{LAST_INSERT_ID()}. This can be used -to simulate sequences: - -First create the table: - -@example -mysql> CREATE TABLE sequence (id INT NOT NULL); -mysql> INSERT INTO sequence VALUES (0); -@end example - -Then the table can be used to generate sequence numbers like this: - -@example -mysql> UPDATE sequence SET id=LAST_INSERT_ID(id+1); -@end example - -You can generate sequences without calling @code{LAST_INSERT_ID()}, but the -utility of using the function this way is that the ID value is maintained in -the server as the last automatically generated value (multi-user safe). -You can retrieve the new ID as you would read any normal -@code{AUTO_INCREMENT} value in MySQL. For example, @code{LAST_INSERT_ID()} -(without an argument) will return the new ID. The C API function -@code{mysql_insert_id()} can also be used to get the value. - -Note that as @code{mysql_insert_id()} is only updated after @code{INSERT} -and @code{UPDATE} statements, so you can't use the C API function to -retrieve the value for @code{LAST_INSERT_ID(expr)} after executing other -SQL statements like @code{SELECT} or @code{SET}. - - -@findex FORMAT() -@item FORMAT(X,D) -Formats the number @code{X} to a format like @code{'#,###,###.##'}, rounded -to @code{D} decimals. If @code{D} is @code{0}, the result will have no -decimal point or fractional part: - -@example -mysql> SELECT FORMAT(12332.123456, 4); - -> '12,332.1235' -mysql> SELECT FORMAT(12332.1,4); - -> '12,332.1000' -mysql> SELECT FORMAT(12332.2,0); - -> '12,332' -@end example - -@findex VERSION() -@item VERSION() -Returns a string indicating the MySQL server version: - -@example -mysql> SELECT VERSION(); - -> '3.23.13-log' -@end example - -Note that if your version ends with @code{-log} this means that logging is -enabled. - -@findex CONNECTION_ID() -@item CONNECTION_ID() -Returns the connection id (@code{thread_id}) for the connection. -Every connection has its own unique id: - -@example -mysql> SELECT CONNECTION_ID(); - -> 1 -@end example - -@cindex timeout -@findex GET_LOCK() -@item GET_LOCK(str,timeout) -Tries to obtain a lock with a name given by the string @code{str}, with a -timeout of @code{timeout} seconds. Returns @code{1} if the lock was obtained -successfully, @code{0} if the attempt timed out, or @code{NULL} if an error -occurred (such as running out of memory or the thread was killed with -@code{mysqladmin kill}). A lock is released when you execute -@code{RELEASE_LOCK()}, execute a new @code{GET_LOCK()}, or the thread -terminates. This function can be used to implement application locks or to -simulate record locks. It blocks requests by other clients for locks with -the same name; clients that agree on a given lock string name can use the -string to perform cooperative advisory locking: - -@example -mysql> SELECT GET_LOCK("lock1",10); - -> 1 -mysql> SELECT IS_FREE_LOCK("lock2"); - -> 1 -mysql> SELECT GET_LOCK("lock2",10); - -> 1 -mysql> SELECT RELEASE_LOCK("lock2"); - -> 1 -mysql> SELECT RELEASE_LOCK("lock1"); - -> NULL -@end example - -Note that the second @code{RELEASE_LOCK()} call returns @code{NULL} because -the lock @code{"lock1"} was automatically released by the second -@code{GET_LOCK()} call. - -@findex RELEASE_LOCK() -@item RELEASE_LOCK(str) -Releases the lock named by the string @code{str} that was obtained with -@code{GET_LOCK()}. Returns @code{1} if the lock was released, @code{0} if the -lock wasn't locked by this thread (in which case the lock is not released), -and @code{NULL} if the named lock didn't exist. The lock will not exist if -it was never obtained by a call to @code{GET_LOCK()} or if it already has -been released. - -The @code{DO} statement is convinient to use with @code{RELEASE_LOCK()}. -@xref{DO}. - -@findex IS_FREE_LOCK() -@item IS_FREE_LOCK(str) -Checks if the the lock named @code{str} is free to use (i.e., not locked). -Returns @code{1} if the lock is free (no one is using the lock), -@code{0} if the lock is in use, and -@code{NULL} on errors (like incorrect arguments). - -@findex BENCHMARK() -@item BENCHMARK(count,expr) -The @code{BENCHMARK()} function executes the expression @code{expr} -repeatedly @code{count} times. It may be used to time how fast MySQL -processes the expression. The result value is always @code{0}. The intended -use is in the @code{mysql} client, which reports query execution times: - -@example -mysql> SELECT BENCHMARK(1000000,ENCODE("hello","goodbye")); -+----------------------------------------------+ -| BENCHMARK(1000000,ENCODE("hello","goodbye")) | -+----------------------------------------------+ -| 0 | -+----------------------------------------------+ -1 row in set (4.74 sec) -@end example - -The time reported is elapsed time on the client end, not CPU time on the -server end. It may be advisable to execute @code{BENCHMARK()} several -times, and interpret the result with regard to how heavily loaded the -server machine is. - -@findex INET_NTOA() -@item INET_NTOA(expr) -Given a numeric network address (4 or 8 byte), returns the dotted-quad -representation of the address as a string: - -@example -mysql> SELECT INET_NTOA(3520061480); - -> "209.207.224.40" -@end example - -@findex INET_ATON() -@item INET_ATON(expr) -Given the dotted-quad representation of a network address as a string, -returns an integer that represents the numeric value of the address. -Addresses may be 4 or 8 byte addresses: - -@example -mysql> SELECT INET_ATON("209.207.224.40"); - -> 3520061480 -@end example - -The generated number is always in network byte order; for example the -above number is calculated as @code{209*256^3 + 207*256^2 + 224*256 +40}. - -@findex MASTER_POS_WAIT() -@item MASTER_POS_WAIT(log_name, log_pos) -Blocks until the slave reaches the specified position in the master -log during replication. If master information is not initialised, -returns @code{NULL}. If the slave is not running, will block and wait -until it is started and goes to or past the specified position. If the -slave is already past the specified position, returns immediately. The -return value is the number of log events it had to wait to get to the -specified position, or @code{NULL} in case of error. Useful for control -of master-slave synchronisation, but was originally written to facilitate -replication testing. - -@findex FOUND_ROWS() -@findex LIMIT -@item FOUND_ROWS() -Returns the number of rows that the last @code{SELECT SQL_CALC_FOUND_ROWS ...} -command would have returned, if wasn't restricted with @code{LIMIT}. - -@example -mysql> SELECT SQL_CALC_FOUND_ROWS * FROM tbl_name - WHERE id > 100 LIMIT 10; -mysql> SELECT FOUND_ROWS(); -@end example - -The second @code{SELECT} will return a number indicating how many rows the -first @code{SELECT} would have returned had it been written without the -@code{LIMIT} clause. - -Note that if you are using @code{SELECT SQL_CALC_FOUND_ROWS ...} MySQL has -to calculate all rows in the result set. However, this is faster than -if you would not use @code{LIMIT}, as the result set need not be sent -to the client. - -@code{SQL_CALC_FOUND_ROWS} is available starting at MySQL version 4.0.0. -@end table - - -@node Group by functions, , Other Functions, Functions -@subsection Functions for Use with @code{GROUP BY} Clauses - -@findex GROUP BY functions -@findex functions, GROUP BY - -If you use a group function in a statement containing no @code{GROUP BY} -clause, it is equivalent to grouping on all rows. - -@table @code -@findex COUNT() -@item COUNT(expr) -Returns a count of the number of non-@code{NULL} values in the rows -retrieved by a @code{SELECT} statement: - -@example -mysql> SELECT student.student_name,COUNT(*) - -> FROM student,course - -> WHERE student.student_id=course.student_id - -> GROUP BY student_name; - -@end example - -@code{COUNT(*)} is somewhat different in that it returns a count of -the number of rows retrieved, whether they contain @code{NULL} -values. - -@code{COUNT(*)} is optimised to -return very quickly if the @code{SELECT} retrieves from one table, no -other columns are retrieved, and there is no @code{WHERE} clause. -For example: - -@example -mysql> SELECT COUNT(*) FROM student; -@end example - -@findex COUNT(DISTINCT) -@findex DISTINCT -@item COUNT(DISTINCT expr,[expr...]) -Returns a count of the number of different non-@code{NULL} values: - -@example -mysql> SELECT COUNT(DISTINCT results) FROM student; -@end example - -In MySQL you can get the number of distinct expression -combinations that don't contain NULL by giving a list of expressions. -In ANSI SQL you would have to do a concatenation of all expressions -inside @code{COUNT(DISTINCT ...)}. - -@findex AVG() -@item AVG(expr) -Returns the average value of @code{expr}: - -@example -mysql> SELECT student_name, AVG(test_score) - -> FROM student - -> GROUP BY student_name; -@end example - -@findex MIN() -@findex MAX() -@item MIN(expr) -@itemx MAX(expr) -Returns the minimum or maximum value of @code{expr}. @code{MIN()} and -@code{MAX()} may take a string argument; in such cases they return the -minimum or maximum string value. @xref{MySQL indexes}. - -@example -mysql> SELECT student_name, MIN(test_score), MAX(test_score) - -> FROM student - -> GROUP BY student_name; -@end example - -In @code{MIN()}, @code{MAX()} and other aggregate functions, MySQL -currently compares @code{ENUM} and @code{SET} columns by their string -value rather than by the string's relative position in the set. -This will be rectified. - -@findex SUM() -@item SUM(expr) -Returns the sum of @code{expr}. Note that if the return set has no rows, -it returns NULL! - -@findex STD() -@findex STDDEV() -@cindex Oracle compatibility -@cindex compatibility, with Oracle -@item STD(expr) -@itemx STDDEV(expr) -Returns the standard deviation of @code{expr}. This is an extension to -ANSI SQL. The @code{STDDEV()} form of this function is provided for Oracle -compatibility. - -@findex BIT_OR() -@item BIT_OR(expr) -Returns the bitwise @code{OR} of all bits in @code{expr}. The calculation is -performed with 64-bit (@code{BIGINT}) precision. - -@findex BIT_AND() -@item BIT_AND(expr) -Returns the bitwise @code{AND} of all bits in @code{expr}. The calculation is -performed with 64-bit (@code{BIGINT}) precision. -@end table - -@cindex @code{GROUP BY}, extensions to ANSI SQL -MySQL has extended the use of @code{GROUP BY}. You can use columns or -calculations in the @code{SELECT} expressions that don't appear in -the @code{GROUP BY} part. This stands for @emph{any possible value for this -group}. You can use this to get better performance by avoiding sorting and -grouping on unnecessary items. For example, you don't need to group on -@code{customer.name} in the following query: - -@example -mysql> SELECT order.custid,customer.name,MAX(payments) - -> FROM order,customer - -> WHERE order.custid = customer.custid - -> GROUP BY order.custid; -@end example - -In ANSI SQL, you would have to add @code{customer.name} to the @code{GROUP -BY} clause. In MySQL, the name is redundant if you don't run in -ANSI mode. - -@strong{Don't use this feature} if the columns you omit from the -@code{GROUP BY} part aren't unique in the group! You will get -unpredictable results. - -In some cases, you can use @code{MIN()} and @code{MAX()} to obtain a specific -column value even if it isn't unique. The following gives the value of -@code{column} from the row containing the smallest value in the @code{sort} -column: - -@example -SUBSTR(MIN(CONCAT(RPAD(sort,6,' '),column)),7) -@end example - -@xref{example-Maximum-column-group-row}. - -@cindex @code{ORDER BY}, aliases in -@cindex aliases, in @code{ORDER BY} clauses -@cindex @code{GROUP BY}, aliases in -@cindex aliases, in @code{GROUP BY} clauses -@cindex expression aliases -@cindex aliases, for expressions -Note that if you are using MySQL Version 3.22 (or earlier) or if -you are trying to follow ANSI SQL, you can't use expressions in @code{GROUP -BY} or @code{ORDER BY} clauses. You can work around this limitation by -using an alias for the expression: - -@example -mysql> SELECT id,FLOOR(value/100) AS val FROM tbl_name - -> GROUP BY id,val ORDER BY val; -@end example - -In MySQL Version 3.23 you can do: - -@example -mysql> SELECT id,FLOOR(value/100) FROM tbl_name ORDER BY RAND(); -@end example - - - -@node Data Manipulation, Data Definition, Functions, Reference -@section Data Manipulation: @code{SELECT}, @code{INSERT}, @code{UPDATE}, @code{DELETE} - - -@menu -* SELECT:: @code{SELECT} Syntax -* HANDLER:: @code{HANDLER} Syntax -* INSERT:: @code{INSERT} Syntax -* INSERT DELAYED:: @code{INSERT DELAYED} Syntax -* UPDATE:: @code{UPDATE} Syntax -* DELETE:: @code{DELETE} Syntax -* TRUNCATE:: @code{TRUNCATE} Syntax -* REPLACE:: @code{REPLACE} Syntax -* LOAD DATA:: @code{LOAD DATA INFILE} Syntax -* DO:: @code{DO} Syntax -@end menu - -@node SELECT, HANDLER, Data Manipulation, Data Manipulation -@subsection @code{SELECT} Syntax - -@findex SELECT - -@c help SELECT -@example -SELECT [STRAIGHT_JOIN] - [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT] - [SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS] [HIGH_PRIORITY] - [DISTINCT | DISTINCTROW | ALL] - select_expression,... - [INTO @{OUTFILE | DUMPFILE@} 'file_name' export_options] - [FROM table_references - [WHERE where_definition] - [GROUP BY @{unsigned_integer | col_name | formula@} [ASC | DESC], ... - [HAVING where_definition] - [ORDER BY @{unsigned_integer | col_name | formula@} [ASC | DESC] ,...] - [LIMIT [offset,] rows] - [PROCEDURE procedure_name] - [FOR UPDATE | LOCK IN SHARE MODE]] -@end example -@c help end - -@code{SELECT} is used to retrieve rows selected from one or more tables. -@code{select_expression} indicates the columns you want to retrieve. -@code{SELECT} may also be used to retrieve rows computed without reference to -any table. For example: - -@example -mysql> SELECT 1 + 1; - -> 2 -@end example - -All keywords used must be given in exactly the order shown above. For example, -a @code{HAVING} clause must come after any @code{GROUP BY} clause and before -any @code{ORDER BY} clause. - -@itemize @bullet - -@item -@cindex aliases, on expressions -@cindex expression aliases -A @code{SELECT} expression may be given an alias using @code{AS}. The alias -is used as the expression's column name and can be used with -@code{ORDER BY} or @code{HAVING} clauses. For example: - -@example -mysql> SELECT CONCAT(last_name,', ',first_name) AS full_name - FROM mytable ORDER BY full_name; -@end example - -@item -It is not allowed to use a column alias in a @code{WHERE} clause, -because the column value may not yet be determined when the -@code{WHERE} clause is executed. -@xref{Problems with alias}. - -@item -@findex AS -@findex USE INDEX -@findex IGNORE INDEX -@findex USE KEY -@findex IGNORE KEY -The @code{FROM table_references} clause indicates the tables from which to -retrieve rows. If you name more than one table, you are performing a -join. For information on join syntax, see @ref{JOIN, , @code{JOIN}}. -For each table specified, you may optionally specify an alias. -@example -table_name [[AS] alias] [USE INDEX (key_list)] [IGNORE INDEX (key_list)] -@end example -As of MySQL Version 3.23.12, you can give hints about which -index MySQL should use when retrieving information from a -table. This is useful if @code{EXPLAIN} shows that MySQL is -using the wrong index from the list of possible indexes. By specifying -@code{USE INDEX (key_list)}, you can tell MySQL to use only one of the -possible indexes to find rows in the table. The alternative syntax -@code{IGNORE INDEX (key_list)} can be used to tell MySQL to not use some -particular index. - -@code{USE/IGNORE KEY} are synonyms for @code{USE/IGNORE INDEX}. - -@item -You can refer to a column as @code{col_name}, @code{tbl_name.col_name}, or -@code{db_name.tbl_name.col_name}. You need not specify a @code{tbl_name} or -@code{db_name.tbl_name} prefix for a column reference in a @code{SELECT} -statement unless the reference would be ambiguous. See @ref{Legal names}, -for examples of ambiguity that require the more explicit column reference -forms. - -@item -@cindex aliases, for tables -@cindex table aliases -A table reference may be aliased using @code{tbl_name [AS] alias_name}: - -@example -mysql> SELECT t1.name, t2.salary FROM employee AS t1, info AS t2 - -> WHERE t1.name = t2.name; -mysql> SELECT t1.name, t2.salary FROM employee t1, info t2 - -> WHERE t1.name = t2.name; -@end example - -@item -Columns selected for output may be referred to in @code{ORDER BY} and -@code{GROUP BY} clauses using column names, column aliases, or column -positions. Column positions begin with 1: - -@example -mysql> SELECT college, region, seed FROM tournament - -> ORDER BY region, seed; -mysql> SELECT college, region AS r, seed AS s FROM tournament - -> ORDER BY r, s; -mysql> SELECT college, region, seed FROM tournament - -> ORDER BY 2, 3; -@end example - -To sort in reverse order, add the @code{DESC} (descending) keyword to the -name of the column in the @code{ORDER BY} clause that you are sorting by. -The default is ascending order; this may be specified explicitly using -the @code{ASC} keyword. - -@item -You can in the @code{WHERE} clause use any of the functions that -MySQL support. @xref{Functions}. - -@item -The @code{HAVING} clause can refer to any column or alias named in the -@code{select_expression}. It is applied last, just before items are sent to -the client, with no optimisation. Don't use @code{HAVING} for items that -should be in the @code{WHERE} clause. For example, do not write this: - -@example -mysql> SELECT col_name FROM tbl_name HAVING col_name > 0; -@end example - -Write this instead: - -@example -mysql> SELECT col_name FROM tbl_name WHERE col_name > 0; -@end example - -In MySQL Version 3.22.5 or later, you can also write queries like this: - -@example -mysql> SELECT user,MAX(salary) FROM users - -> GROUP BY user HAVING MAX(salary)>10; -@end example - -In older MySQL versions, you can write this instead: - -@example -mysql> SELECT user,MAX(salary) AS sum FROM users - -> group by user HAVING sum>10; -@end example - -@item -The options @code{DISTINCT}, @code{DISTINCTROW} and @code{ALL} specify -whether duplicate rows should be returned. The default is (@code{ALL}), -all matching rows are returned. @code{DISTINCT} and @code{DISTINCTROW} -are synonyms and specify that duplicate rows in the result set should -be removed. - -@item -All options beginning with @code{SQL_}, @code{STRAIGHT_JOIN}, and -@code{HIGH_PRIORITY} are MySQL extensions to ANSI SQL. - -@item -@code{HIGH_PRIORITY} will give the @code{SELECT} higher priority than -a statement that updates a table. You should only use this for queries -that are very fast and must be done at once. A @code{SELECT HIGH_PRIORITY} -query will run if the table is locked for read even if there is an update -statement that is waiting for the table to be free. - -@item -@code{SQL_BIG_RESULT} can be used with @code{GROUP BY} or @code{DISTINCT} -to tell the optimiser that the result set will have many rows. In this case, -MySQL will directly use disk-based temporary tables if needed. -MySQL will also, in this case, prefer sorting to doing a -temporary table with a key on the @code{GROUP BY} elements. - -@item -@code{SQL_BUFFER_RESULT} will force the result to be put into a temporary -table. This will help MySQL free the table locks early and will help -in cases where it takes a long time to send the result set to the client. - -@item -@code{SQL_SMALL_RESULT}, a MySQL-specific option, can be used -with @code{GROUP BY} or @code{DISTINCT} to tell the optimiser that the -result set will be small. In this case, MySQL will use fast -temporary tables to store the resulting table instead of using sorting. In -MySQL Version 3.23 this shouldn't normally be needed. - -@item -@code{SQL_CALC_FOUND_ROWS} tells MySQL to calculate how many rows there -would be in the result, disregarding any @code{LIMIT} clause. The number -of rows can be obtained with @code{SELECT -FOUND_ROWS()}. @xref{Miscellaneous functions}. - -@item -@code{SQL_CACHE} tells MySQL to store the query result in the query cache -if you are using @code{QUERY_CACHE_TYPE=2} (@code{DEMAND}). -@xref{Query Cache}. - -@item -@code{SQL_NO_CACHE} tells MySQL to not allow the query result to be stored -in the query cache. @xref{Query Cache}. - -@item -@cindex @code{GROUP BY}, extensions to ANSI SQL -If you use @code{GROUP BY}, the output rows will be sorted according to the -@code{GROUP BY} as if you would have had an @code{ORDER BY} over all the fields -in the @code{GROUP BY}. MySQL has extended the @code{GROUP BY} so that -you can also specify @code{ASC} and @code{DESC} to @code{GROUP BY}: - -@example -SELECT a,COUNT(b) FROM test_table GROUP BY a DESC -@end example - -@item -MySQL has extended the use of @code{GROUP BY} to allow you to -select fields which are not mentioned in the @code{GROUP BY} clause. -If you are not getting the results you expect from your query, please -read the @code{GROUP BY} description. -@xref{Group by functions}. - -@item -@cindex hints -@code{STRAIGHT_JOIN} forces the optimiser to join the tables in the order in -which they are listed in the @code{FROM} clause. You can use this to speed up -a query if the optimiser joins the tables in non-optimal order. -@xref{EXPLAIN, , @code{EXPLAIN}}. - -@item -The @code{LIMIT} clause can be used to constrain the number of rows returned -by the @code{SELECT} statement. @code{LIMIT} takes one or two numeric -arguments. The arguments must be integer constants. - -If two arguments are given, the first specifies the offset of the first row to -return, the second specifies the maximum number of rows to return. -The offset of the initial row is 0 (not 1): - -@example -mysql> SELECT * FROM table LIMIT 5,10; # Retrieve rows 6-15 -@end example - -To retrieve all rows from a certain offset upto the end of the result set, -you can use -1 for the second parameter: - -@example -mysql> SELECT * FROM table LIMIT 95,-1; # Retrieve rows 96-last. -@end example - -If one argument is given, it indicates the maximum number of rows to return: - -@example -mysql> SELECT * FROM table LIMIT 5; # Retrieve first 5 rows -@end example - -In other words, @code{LIMIT n} is equivalent to @code{LIMIT 0,n}. - -@item -@tindex /etc/passwd -The @code{SELECT ... INTO OUTFILE 'file_name'} form of @code{SELECT} writes -the selected rows to a file. The file is created on the server host and -cannot already exist (among other things, this prevents database tables and -files such as @file{/etc/passwd} from being destroyed). You must have the -@code{FILE} privilege on the server host to use this form of @code{SELECT}. - -@code{SELECT ... INTO OUTFILE} is mainly intended to let you very -quickly dump a table on the server machine. If you want to create the -resulting file on some other host than the server host you can't use -@code{SELECT ... INTO OUTFILE}. In this case you should instead use some -client program like @code{mysqldump --tab} or @code{mysql -e "SELECT -..." > outfile} to generate the file. - -@code{SELECT ... INTO OUTFILE} is the complement of @code{LOAD DATA -INFILE}; the syntax for the @code{export_options} part of the statement -consists of the same @code{FIELDS} and @code{LINES} clauses that are used -with the @code{LOAD DATA INFILE} statement. -@xref{LOAD DATA, , @code{LOAD DATA}}. - -In the resulting text file, only the following characters are escaped by -the @code{ESCAPED BY} character: - -@itemize @bullet -@item The @code{ESCAPED BY} character -@item The first character in @code{FIELDS TERMINATED BY} -@item The first character in @code{LINES TERMINATED BY} -@end itemize - -Additionally, @code{ASCII 0} is converted to @code{ESCAPED BY} followed by 0 -(@code{ASCII 48}). - -The reason for the above is that you @strong{must} escape any @code{FIELDS -TERMINATED BY}, @code{ESCAPED BY}, or @code{LINES TERMINATED BY} -characters to reliably be able to read the file back. @code{ASCII 0} is -escaped to make it easier to view with some pagers. - -As the resulting file doesn't have to conform to the SQL syntax, nothing -else need be escaped. - -Here follows an example of getting a file in the format used by many -old programs. - -@example -SELECT a,b,a+b INTO OUTFILE "/tmp/result.text" -FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' -LINES TERMINATED BY "\n" -FROM test_table; -@end example - -@item -@findex DUMPFILE -If you use @code{INTO DUMPFILE} instead of @code{INTO OUTFILE}, MySQL -will only write one row into the file, without any column or line -terminations and without any escaping. This is useful if you want to -store a blob in a file. - -@item -Note that any file created by @code{INTO OUTFILE} and @code{INTO -DUMPFILE} is going to be readable for all users! The reason is that the -MySQL server can't create a file that is owned by anyone else -than the user it's running as (you should never run @code{mysqld} as root), -the file has to be word readable so that you can retrieve the rows. - -@item -If you are using @code{FOR UPDATE} on a table handler with page/row locks, -the examined rows will be write locked. -@end itemize - - -@menu -* JOIN:: @code{JOIN} Syntax -* UNION:: @code{UNION} Syntax -@end menu - -@node JOIN, UNION, SELECT, SELECT -@subsubsection @code{JOIN} Syntax - -@findex JOIN -@findex INNER JOIN -@findex CROSS JOIN -@findex LEFT JOIN -@findex LEFT OUTER JOIN -@findex NATURAL LEFT JOIN -@findex NATURAL LEFT OUTER JOIN -@findex RIGHT JOIN -@findex RIGHT OUTER JOIN -@findex NATURAL RIGHT JOIN -@findex NATURAL RIGHT OUTER JOIN -@findex STRAIGHT_JOIN - -MySQL supports the following @code{JOIN} syntaxes for use in -@code{SELECT} statements: - -@example -table_reference, table_reference -table_reference [CROSS] JOIN table_reference -table_reference INNER JOIN table_reference join_condition -table_reference STRAIGHT_JOIN table_reference -table_reference LEFT [OUTER] JOIN table_reference join_condition -table_reference LEFT [OUTER] JOIN table_reference -table_reference NATURAL [LEFT [OUTER]] JOIN table_reference -@{ OJ table_reference LEFT OUTER JOIN table_reference ON conditional_expr @} -table_reference RIGHT [OUTER] JOIN table_reference join_condition -table_reference RIGHT [OUTER] JOIN table_reference -table_reference NATURAL [RIGHT [OUTER]] JOIN table_reference -@end example - -Where @code{table_reference} is defined as: -@findex AS -@example -table_name [[AS] alias] [USE INDEX (key_list)] [IGNORE INDEX (key_list)] -@end example - -and @code{join_condition} is defined as: - -@example -ON conditional_expr | -USING (column_list) -@end example - -You should never have any conditions in the @code{ON} part that are used to -restrict which rows you have in the result set. If you want to restrict -which rows should be in the result, you have to do this in the @code{WHERE} -clause. - -Note that in versions before Version 3.23.17, the @code{INNER JOIN} didn't -take a @code{join_condition}! - -@cindex ODBC compatibility -@cindex compatibility, with ODBC -The last @code{LEFT OUTER JOIN} syntax shown above exists only for -compatibility with ODBC: - -@itemize @bullet -@item -A table reference may be aliased using @code{tbl_name AS alias_name} or -@code{tbl_name alias_name}: - -@example -mysql> SELECT t1.name, t2.salary FROM employee AS t1, info AS t2 - -> WHERE t1.name = t2.name; -@end example - -@item -The @code{ON} conditional is any conditional of the form that may be used in -a @code{WHERE} clause. - -@item -If there is no matching record for the right table in the @code{ON} or -@code{USING} part in a @code{LEFT JOIN}, a row with all columns set to -@code{NULL} is used for the right table. You can use this fact to find -records in a table that have no counterpart in another table: - -@example -mysql> SELECT table1.* FROM table1 - -> LEFT JOIN table2 ON table1.id=table2.id - -> WHERE table2.id IS NULL; -@end example - -This example finds all rows in @code{table1} with an @code{id} value that is -not present in @code{table2} (that is, all rows in @code{table1} with no -corresponding row in @code{table2}). This assumes that @code{table2.id} is -declared @code{NOT NULL}, of course. @xref{LEFT JOIN optimisation}. - -@item -The @code{USING} @code{(column_list)} clause names a list of columns that must -exist in both tables. A @code{USING} clause such as: - -@example -A LEFT JOIN B USING (C1,C2,C3,...) -@end example - -is defined to be semantically identical to an @code{ON} expression like -this: - -@example -A.C1=B.C1 AND A.C2=B.C2 AND A.C3=B.C3,... -@end example - -@item -The @code{NATURAL [LEFT] JOIN} of two tables is defined to be -semantically equivalent to an @code{INNER JOIN} or a @code{LEFT JOIN} -with a @code{USING} clause that names all columns that exist in both -tables. - -@item -@cindex hints -@code{INNER JOIN} and @code{,} (comma) are semantically equivalent. -Both do a full join between the tables used. Normally, you specify -how the tables should be linked in the WHERE condition. - -@item -@code{RIGHT JOIN} works analogously as @code{LEFT JOIN}. To keep code -portable across databases, it's recommended to use @code{LEFT JOIN} -instead of @code{RIGHT JOIN}. - -@item -@cindex hints -@code{STRAIGHT_JOIN} is identical to @code{JOIN}, except that the left table -is always read before the right table. This can be used for those (few) -cases where the join optimiser puts the tables in the wrong order. - -@item -@cindex hints -@findex USE INDEX -@findex IGNORE INDEX -As of MySQL Version 3.23.12, you can give hints about which -index MySQL should use when retrieving information from a -table. This is useful if @code{EXPLAIN} shows that MySQL is -using the wrong index from the list of possible indexes. By specifying -@code{USE INDEX (key_list)}, you can tell MySQL to use only one of the -possible indexes to find rows in the table. The alternative syntax -@code{IGNORE INDEX (key_list)} can be used to tell MySQL to not use some -particular index. - -@findex USE KEY -@findex IGNORE KEY -@code{USE/IGNORE KEY} are synonyms for @code{USE/IGNORE INDEX}. -@end itemize - -Some examples: - -@example -mysql> SELECT * FROM table1,table2 WHERE table1.id=table2.id; -mysql> SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id; -mysql> SELECT * FROM table1 LEFT JOIN table2 USING (id); -mysql> SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id - -> LEFT JOIN table3 ON table2.id=table3.id; -mysql> SELECT * FROM table1 USE INDEX (key1,key2) - -> WHERE key1=1 AND key2=2 AND key3=3; -mysql> SELECT * FROM table1 IGNORE INDEX (key3) - -> WHERE key1=1 AND key2=2 AND key3=3; -@end example - -@xref{LEFT JOIN optimisation, , @code{LEFT JOIN} optimisation}. - - -@node UNION, , JOIN, SELECT -@subsubsection @code{UNION} Syntax - -@findex UNION - -@example -SELECT ... -UNION [ALL] -SELECT ... - [UNION - SELECT ...] -@end example - -@code{UNION} is implemented in MySQL 4.0.0. - -@code{UNION} is used to combine the result from many @code{SELECT} -statements into one result set. - -The columns listed in the select_expression portion of the @code{SELECT} -should have the same type. The column names used in the first -@code{SELECT} query will be used as the column names for the results -returned. - -The @code{SELECT} commands are normal select commands, but with the following -restrictions: - -@itemize @bullet -@item -Only the last @code{SELECT} command can have @code{INTO OUTFILE}. -@end itemize - -If you don't use the keyword @code{ALL} for the @code{UNION}, all -returned rows will be unique, as if you had done a @code{DISTINCT} for -the total result set. If you specify @code{ALL}, then you will get all -matching rows from all the used @code{SELECT} statements. - -If you want to use an @code{ORDER BY} for the total @code{UNION} result, -you should use parentheses: - -@example -(SELECT a FROM table_name WHERE a=10 AND B=1 ORDER BY a LIMIT 10) -UNION -(SELECT a FROM table_name WHERE a=11 AND B=2 ORDER BY a LIMIT 10) -ORDER BY a; -@end example - -@findex HANDLER -@node HANDLER, INSERT, SELECT, Data Manipulation -@subsection @code{HANDLER} Syntax - -@example -HANDLER tbl_name OPEN [ AS alias ] -HANDLER tbl_name READ index_name @{ = | >= | <= | < @} (value1,value2,...) - [ WHERE ... ] [LIMIT ... ] -HANDLER tbl_name READ index_name @{ FIRST | NEXT | PREV | LAST @} - [ WHERE ... ] [LIMIT ... ] -HANDLER tbl_name READ @{ FIRST | NEXT @} - [ WHERE ... ] [LIMIT ... ] -HANDLER tbl_name CLOSE -@end example - -The @code{HANDLER} statement provides direct access to the @code{MyISAM} table -handler interface. - -The first form of @code{HANDLER} statement opens a table, making -it accessible via subsequent @code{HANDLER ... READ} statements. -This table object is not shared by other threads and will not be closed -until the thread calls @code{HANDLER tbl_name CLOSE} or the thread dies. - -@c FIX The sentence below needs to be rewritten. The reference to "the condition" is not clear. -@c FIX Also all mentions of the LIMIT clause need to be clarified in various sentences below. - -The second form fetches one row (or more, specified by @code{LIMIT} clause) -where the index specified complies to the condition and @code{WHERE} -condition is met. If the index consists of several parts (spans over -several columns) the values are specified in comma-separated list, -providing values only for few first columns is possible. - -The third form fetches one row (or more, specified by @code{LIMIT} clause) -from the table in index order, matching @code{WHERE} condition. - -The fourth form (without index specification) fetches one row (or more, specified -by @code{LIMIT} clause) from the table in natural row order (as stored -in datafile) matching @code{WHERE} condition. It is faster than -@code{HANDLER tbl_name READ index_name} when a full table scan is desired. - -@code{HANDLER ... CLOSE} closes a table that was opened with -@code{HANDLER ... OPEN}. - -@code{HANDLER} is a somewhat low-level statement. For example, it does -not provide consistency. That is, @code{HANDLER ... OPEN} does @strong{NOT} -take a snapshot of the table, and does @strong{NOT} lock the table. This -means that after a @code{HANDLER ... OPEN} is issued, table data can be -modified (by this or any other thread) and these modifications may appear -only partially in @code{HANDLER ... NEXT} or @code{HANDLER ... PREV} scans. - -The reasons to use this interface instead of normal SQL are: - -@itemize @bullet -@item -It's faster than @code{SELECT} because: -@itemize @bullet -@item -A designated table handler is allocated for the thread in @code{HANDLER open}. -@item -There is less parsing involved. -@item -No optimiser and no query checking overhead. -@item -The used table doesn't have to be locked between two handler requests. -@item -The handler interface doesn't have to provide a consistent look of the -data (for example dirty-reads are allow), which allows the table handler -to do optimisations that SQL doesn't normally allow. -@end itemize -@item -It makes it much easier to port applications that uses an ISAM like -interface to MySQL. -@item -It allows one to traverse a database in a manner that is not easy -(in some case impossible) to do with SQL. The handler interface is -more natural way to look at data when working with applications that -provide an interactive user interfaces to the database. -@end itemize - -@node INSERT, INSERT DELAYED, HANDLER, Data Manipulation -@subsection @code{INSERT} Syntax - -@findex INSERT - -@example - INSERT [LOW_PRIORITY | DELAYED] [IGNORE] - [INTO] tbl_name [(col_name,...)] - VALUES ((expression | DEFAULT),...),(...),... -or INSERT [LOW_PRIORITY | DELAYED] [IGNORE] - [INTO] tbl_name [(col_name,...)] - SELECT ... -or INSERT [LOW_PRIORITY | DELAYED] [IGNORE] - [INTO] tbl_name - SET col_name=(expression | DEFAULT), ... - -@end example - -@code{INSERT} inserts new rows into an existing table. The @code{INSERT -... VALUES} form of the statement inserts rows based on explicitly -specified values. The @code{INSERT ... SELECT} form inserts rows -selected from another table or tables. The @code{INSERT ... VALUES} -form with multiple value lists is supported in MySQL Version -3.22.5 or later. The @code{col_name=expression} syntax is supported in -MySQL Version 3.22.10 or later. - -@code{tbl_name} is the table into which rows should be inserted. The column -name list or the @code{SET} clause indicates which columns the statement -specifies values for: - -@itemize @bullet -@item -If you specify no column list for @code{INSERT ... VALUES} or @code{INSERT -... SELECT}, values for all columns must be provided in the -@code{VALUES()} list or by the @code{SELECT}. If you don't know the order of -the columns in the table, use @code{DESCRIBE tbl_name} to find out. - -@item -@cindex default values -Any column not explicitly given a value is set to its default value. For -example, if you specify a column list that doesn't name all the columns in -the table, unnamed columns are set to their default values. Default value -assignment is described in @ref{CREATE TABLE, , @code{CREATE TABLE}}. - -You can also use the keyword @code{DEFAULT} to set a column to its -default value. (New in MySQL 4.0.3.) This makes it easier to write -@code{INSERT} statements that assign values to all but a few columns, -because it allows you to avoid writing an incomplete @code{VALUES()} list -(a list that does not include a value for each column in the table). -Otherwise, you would have to write out the list of column names -corresponding to each value in the @code{VALUES()} list. - -MySQL always has a default value for all fields. This is something -that is imposed on MySQL to be able to work with both transactional -and not transactional tables. - -Our view is that checking of fields content should be done in the -application and not in the database server. -@item -An @code{expression} may refer to any column that was set earlier in a value -list. For example, you can say this: - -@example -mysql> INSERT INTO tbl_name (col1,col2) VALUES(15,col1*2); -@end example - -But not this: - -@example -mysql> INSERT INTO tbl_name (col1,col2) VALUES(col2*2,15); -@end example - -@item -If you specify the keyword @code{LOW_PRIORITY}, execution of the -@code{INSERT} is delayed until no other clients are reading from the -table. In this case the client has to wait until the insert statement -is completed, which may take a long time if the table is in heavy -use. This is in contrast to @code{INSERT DELAYED}, which lets the client -continue at once. @xref{INSERT DELAYED}. Note that @code{LOW_PRIORITY} -should normally not be used with @code{MyISAM} tables as this disables -concurrent inserts. @xref{MyISAM}. - -@item -If you specify the keyword @code{IGNORE} in an @code{INSERT} with many value -rows, any rows that duplicate an existing @code{PRIMARY} or @code{UNIQUE} -key in the table are ignored and are not inserted. If you do not specify -@code{IGNORE}, the insert is aborted if there is any row that duplicates an -existing key value. You can determine with the C API function -@code{mysql_info()} how many rows were inserted into the table. - -@item -If MySQL was configured using the @code{DONT_USE_DEFAULT_FIELDS} -option, @code{INSERT} statements generate an error unless you explicitly -specify values for all columns that require a non-@code{NULL} value. -@xref{configure options, , @code{configure} options}. - -@item -You can find the value used for an @code{AUTO_INCREMENT} column -with the @code{mysql_insert_id} function. -@xref{mysql_insert_id, , @code{mysql_insert_id()}}. -@end itemize - -@findex mysql_info() -If you use @code{INSERT ... SELECT} or an @code{INSERT ... VALUES} -statement with multiple value lists, you can use the C API function -@code{mysql_info()} to get information about the query. The format of the -information string is shown here: - -@example -Records: 100 Duplicates: 0 Warnings: 0 -@end example - -@code{Duplicates} indicates the number of rows that couldn't be inserted -because they would duplicate some existing unique index value. -@code{Warnings} indicates the number of attempts to insert column values that -were problematic in some way. Warnings can occur under any of the following -conditions: - -@itemize @bullet -@item -Inserting @code{NULL} into a column that has been declared @code{NOT NULL}. -The column is set to its default value. - -@item -Setting a numeric column to a value that lies outside the column's range. -The value is clipped to the appropriate endpoint of the range. - -@item -Setting a numeric column to a value such as @code{'10.34 a'}. The trailing -garbage is stripped and the remaining numeric part is inserted. If the value -doesn't make sense as a number at all, the column is set to @code{0}. - -@item -Inserting a string into a @code{CHAR}, @code{VARCHAR}, @code{TEXT}, or -@code{BLOB} column that exceeds the column's maximum length. The value is -truncated to the column's maximum length. - -@item -Inserting a value into a date or time column that is illegal for the column -type. The column is set to the appropriate zero value for the type. -@end itemize - -@findex REPLACE ... SELECT -@findex INSERT ... SELECT - -@menu -* INSERT SELECT:: @code{INSERT ... SELECT} Syntax -@end menu - - -@node INSERT SELECT, , INSERT, INSERT -@subsubsection @code{INSERT ... SELECT} Syntax - -@example -INSERT [LOW_PRIORITY] [IGNORE] [INTO] tbl_name [(column list)] SELECT ... -@end example - -With @code{INSERT ... SELECT} statement you can quickly insert many rows -into a table from one or many tables. - -@example -INSERT INTO tblTemp2 (fldID) SELECT tblTemp1.fldOrder_ID FROM tblTemp1 WHERE -tblTemp1.fldOrder_ID > 100; -@end example - -The following conditions hold for an @code{INSERT ... SELECT} statement: - -@itemize @minus -@item -The target table of the @code{INSERT} statement cannot appear in the -@code{FROM} clause of the @code{SELECT} part of the query because it's -forbidden in ANSI SQL to @code{SELECT} from the same table into which you are -inserting. (The problem is that the @code{SELECT} possibly would -find records that were inserted earlier during the same run. When using -subselect clauses, the situation could easily be very confusing!) - -@item -@code{AUTO_INCREMENT} columns work as usual. - -@item -You can use the C API function @code{mysql_info()} to get information about -the query. @xref{INSERT}. - -@item -To ensure that the update log/binary log can be used to re-create the -original tables, MySQL will not allow concurrent inserts during -@code{INSERT ... SELECT}. -@end itemize - -You can of course also use @code{REPLACE} instead of @code{INSERT} to -overwrite old rows. - - -@node INSERT DELAYED, UPDATE, INSERT, Data Manipulation -@subsection @code{INSERT DELAYED} Syntax - -@findex INSERT DELAYED -@findex DELAYED - -@cindex INSERT DELAYED - -@example -INSERT DELAYED ... -@end example - -The @code{DELAYED} option for the @code{INSERT} statement is a -MySQL-specific option that is very useful if you have clients -that can't wait for the @code{INSERT} to complete. This is a common -problem when you use MySQL for logging and you also -periodically run @code{SELECT} and @code{UPDATE} statements that take a -long time to complete. @code{DELAYED} was introduced in MySQL -Version 3.22.15. It is a MySQL extension to ANSI SQL92. - -@code{INSERT DELAYED} only works with @code{ISAM} and @code{MyISAM} -tables. Note that as @code{MyISAM} tables supports concurrent -@code{SELECT} and @code{INSERT}, if there is no free blocks in the -middle of the datafile, you very seldom need to use @code{INSERT -DELAYED} with @code{MyISAM}. @xref{MyISAM}. - -When you use @code{INSERT DELAYED}, the client will get an OK at once -and the row will be inserted when the table is not in use by any other thread. - -Another major benefit of using @code{INSERT DELAYED} is that inserts -from many clients are bundled together and written in one block. This is much -faster than doing many separate inserts. - -Note that currently the queued rows are only stored in memory until they are -inserted into the table. This means that if you kill @code{mysqld} -the hard way (@code{kill -9}) or if @code{mysqld} dies unexpectedly, any -queued rows that weren't written to disk are lost! - -The following describes in detail what happens when you use the -@code{DELAYED} option to @code{INSERT} or @code{REPLACE}. In this -description, the ``thread'' is the thread that received an @code{INSERT -DELAYED} command and ``handler'' is the thread that handles all -@code{INSERT DELAYED} statements for a particular table. - -@itemize @bullet -@item -When a thread executes a @code{DELAYED} statement for a table, a handler -thread is created to process all @code{DELAYED} statements for the table, if -no such handler already exists. - -@item -The thread checks whether the handler has acquired a @code{DELAYED} -lock already; if not, it tells the handler thread to do so. The -@code{DELAYED} lock can be obtained even if other threads have a @code{READ} -or @code{WRITE} lock on the table. However, the handler will wait for all -@code{ALTER TABLE} locks or @code{FLUSH TABLES} to ensure that the table -structure is up to date. - -@item -The thread executes the @code{INSERT} statement, but instead of writing -the row to the table, it puts a copy of the final row into a queue that -is managed by the handler thread. Any syntax errors are noticed by the -thread and reported to the client program. - -@item -The client can't report the number of duplicates or the @code{AUTO_INCREMENT} -value for the resulting row; it can't obtain them from the server, because -the @code{INSERT} returns before the insert operation has been completed. If -you use the C API, the @code{mysql_info()} function doesn't return anything -meaningful, for the same reason. - -@item -The update log is updated by the handler thread when the row is inserted into -the table. In case of multiple-row inserts, the update log is updated when -the first row is inserted. - -@item -After every @code{delayed_insert_limit} rows are written, the handler checks -whether any @code{SELECT} statements are still pending. If so, it -allows these to execute before continuing. - -@cindex delayed_insert_limit -@cindex timeout -@item -When the handler has no more rows in its queue, the table is unlocked. If no -new @code{INSERT DELAYED} commands are received within -@code{delayed_insert_timeout} seconds, the handler terminates. - -@item -If more than @code{delayed_queue_size} rows are pending already in a -specific handler queue, the thread requesting @code{INSERT DELAYED} -waits until there is room in the queue. This is done to ensure that -the @code{mysqld} server doesn't use all memory for the delayed memory -queue. - -@item -The handler thread will show up in the MySQL process list -with @code{delayed_insert} in the @code{Command} column. It will -be killed if you execute a @code{FLUSH TABLES} command or kill it with -@code{KILL thread_id}. However, it will first store all queued rows into the -table before exiting. During this time it will not accept any new -@code{INSERT} commands from another thread. If you execute an @code{INSERT -DELAYED} command after this, a new handler thread will be created. - -Note that the above means that @code{INSERT DELAYED} commands have higher -priority than normal @code{INSERT} commands if there is an @code{INSERT -DELAYED} handler already running! Other update commands will have to wait -until the @code{INSERT DELAYED} queue is empty, someone kills the handler -thread (with @code{KILL thread_id}), or someone executes @code{FLUSH TABLES}. - -@item -The following status variables provide information about @code{INSERT -DELAYED} commands: - -@multitable @columnfractions .30 .55 -@item @strong{Variable} @tab @strong{Meaning} -@item @code{Delayed_insert_threads} @tab Number of handler threads -@item @code{Delayed_writes} @tab Number of rows written with @code{INSERT DELAYED} -@item @code{Not_flushed_delayed_rows} @tab Number of rows waiting to be written -@end multitable - -You can view these variables by issuing a @code{SHOW STATUS} statement or -by executing a @code{mysqladmin extended-status} command. -@end itemize - -Note that @code{INSERT DELAYED} is slower than a normal INSERT if the -table is not in use. There is also the additional overhead for the -server to handle a separate thread for each table on which you use -@code{INSERT DELAYED}. This means that you should only use @code{INSERT -DELAYED} when you are really sure you need it! - - -@node UPDATE, DELETE, INSERT DELAYED, Data Manipulation -@subsection @code{UPDATE} Syntax - -@findex UPDATE - -@example -UPDATE [LOW_PRIORITY] [IGNORE] tbl_name - SET col_name1=expr1 [, col_name2=expr2, ...] - [WHERE where_definition] - [ORDER BY ...] - [LIMIT #] -@end example - -@code{UPDATE} updates columns in existing table rows with new values. -The @code{SET} clause indicates which columns to modify and the values -they should be given. The @code{WHERE} clause, if given, specifies -which rows should be updated. Otherwise, all rows are updated. If the -@code{ORDER BY} clause is specified, the rows will be updated in the -order that is specified. - -If you specify the keyword @code{LOW_PRIORITY}, execution of the -@code{UPDATE} is delayed until no other clients are reading from the table. - -If you specify the keyword @code{IGNORE}, the update statement will not -abort even if we get duplicate key errors during the update. Rows that -would cause conflicts will not be updated. - -If you access a column from @code{tbl_name} in an expression, -@code{UPDATE} uses the current value of the column. For example, the -following statement sets the @code{age} column to one more than its -current value: - -@example -mysql> UPDATE persondata SET age=age+1; -@end example - -@code{UPDATE} assignments are evaluated from left to right. For example, the -following statement doubles the @code{age} column, then increments it: - -@example -mysql> UPDATE persondata SET age=age*2, age=age+1; -@end example - -If you set a column to the value it currently has, MySQL notices -this and doesn't update it. - -@findex mysql_info() -@code{UPDATE} returns the number of rows that were actually changed. -In MySQL Version 3.22 or later, the C API function @code{mysql_info()} -returns the number of rows that were matched and updated and the number of -warnings that occurred during the @code{UPDATE}. - -In MySQL Version 3.23, you can use @code{LIMIT #} to ensure that -only a given number of rows are changed. - - -@node DELETE, TRUNCATE, UPDATE, Data Manipulation -@subsection @code{DELETE} Syntax - -@findex DELETE - -@example -DELETE [LOW_PRIORITY] [QUICK] FROM table_name - [WHERE where_definition] - [ORDER BY ...] - [LIMIT rows] - -or - -DELETE [LOW_PRIORITY] [QUICK] table_name[.*] [,table_name[.*] ...] - FROM table-references - [WHERE where_definition] - -or - -DELETE [LOW_PRIORITY] [QUICK] - FROM table_name[.*], [table_name[.*] ...] - USING table-references - [WHERE where_definition] -@end example - -@code{DELETE} deletes rows from @code{table_name} that satisfy the condition -given by @code{where_definition}, and returns the number of records deleted. - -If you issue a @code{DELETE} with no @code{WHERE} clause, all rows are -deleted. If you do this in @code{AUTOCOMMIT} mode, this works as -@code{TRUNCATE}. @xref{TRUNCATE, , @code{TRUNCATE}}. In MySQL 3.23, -@code{DELETE} without a @code{WHERE} clause will return zero as the number -of affected records. - -If you really want to know how many records are deleted when you are deleting -all rows, and are willing to suffer a speed penalty, you can use a -@code{DELETE} statement of this form: - -@example -mysql> DELETE FROM table_name WHERE 1>0; -@end example - -Note that this is much slower than @code{DELETE FROM table_name} with no -@code{WHERE} clause, because it deletes rows one at a time. - -If you specify the keyword @code{LOW_PRIORITY}, execution of the -@code{DELETE} is delayed until no other clients are reading from the table. - -If you specify the word @code{QUICK} then the table handler will not -merge index leaves during delete, which may speed up certain kind of -deletes. - -In @code{MyISAM} tables, deleted records are maintained in a linked list and -subsequent @code{INSERT} operations reuse old record positions. To -reclaim unused space and reduce file-sizes, use the @code{OPTIMIZE -TABLE} statement or the @code{myisamchk} utility to reorganise tables. -@code{OPTIMIZE TABLE} is easier, but @code{myisamchk} is faster. See -@ref{OPTIMIZE TABLE, , @code{OPTIMIZE TABLE}} and @ref{Optimisation}. - -The first multi-table delete format is supported starting from MySQL 4.0.0. -The second multi-table delete format is supported starting from MySQL 4.0.2. - -The idea is that only matching rows from the tables listed -@strong{before} the @code{FROM} or before the @code{USING} clause are -deleted. The effect is that you can delete rows from many tables at the -same time and also have additional tables that are used for searching. - -The @code{.*} after the table names is there just to be compatible with -@code{Access}: - -@example -DELETE t1,t2 FROM t1,t2,t3 WHERE t1.id=t2.id AND t2.id=t3.id - -or - -DELETE FROM t1,t2 USING t1,t2,t3 WHERE t1.id=t2.id AND t2.id=t3.id -@end example - -In the above case we delete matching rows just from tables @code{t1} and -@code{t2}. - -@code{ORDER BY} and using multiple tables in the @code{DELETE} statement -is supported in MySQL 4.0. - -If an @code{ORDER BY} clause is used, the rows will be deleted in that order. -This is really only useful in conjunction with @code{LIMIT}. For example: - -@example -DELETE FROM somelog -WHERE user = 'jcole' -ORDER BY timestamp -LIMIT 1 -@end example - -This will delete the oldest entry (by @code{timestamp}) where the row matches -the @code{WHERE} clause. - -The MySQL-specific @code{LIMIT rows} option to @code{DELETE} tells -the server the maximum number of rows to be deleted before control is -returned to the client. This can be used to ensure that a specific -@code{DELETE} command doesn't take too much time. You can simply repeat -the @code{DELETE} command until the number of affected rows is less than -the @code{LIMIT} value. - - -@node TRUNCATE, REPLACE, DELETE, Data Manipulation -@subsection @code{TRUNCATE} Syntax - -@findex TRUNCATE - -@example -TRUNCATE TABLE table_name -@end example - -In 3.23 @code{TRUNCATE TABLE} is mapped to -@code{COMMIT ; DELETE FROM table_name}. @xref{DELETE}. - -@code{TRUNCATE TABLE} differs from @code{DELETE FROM ...} -in the following ways: - -@itemize @bullet -@item -Truncate operations drop and re-create the table, which is much faster -than deleting rows one by one. -@item -Not transaction-safe; you will get an error if you have an active -transaction or an active table lock. -@item -Doesn't return the number of deleted rows. -@item -As long as the table definition file @file{table_name.frm} is -valid, the table can be re-created this way, even if the data or index -files have become corrupted. -@end itemize - -@code{TRUNCATE} is an Oracle SQL extension. - -@node REPLACE, LOAD DATA, TRUNCATE, Data Manipulation -@subsection @code{REPLACE} Syntax - -@findex REPLACE - -@example - REPLACE [LOW_PRIORITY | DELAYED] - [INTO] tbl_name [(col_name,...)] - VALUES (expression,...),(...),... -or REPLACE [LOW_PRIORITY | DELAYED] - [INTO] tbl_name [(col_name,...)] - SELECT ... -or REPLACE [LOW_PRIORITY | DELAYED] - [INTO] tbl_name - SET col_name=expression, col_name=expression,... -@end example - -@code{REPLACE} works exactly like @code{INSERT}, except that if an old -record in the table has the same value as a new record on a @code{UNIQUE} -index or @code{PRIMARY KEY}, the old record is deleted before the new -record is inserted. -@xref{INSERT, ,@code{INSERT}}. - -In other words, you can't access the values of the old row from a -@code{REPLACE} statement. In some old MySQL versions it appeared that -you could do this, but that was a bug that has been corrected. - -To be able to use @code{REPLACE} you must have @code{INSERT} and -@code{DELETE} privileges for the table. - -When you use a @code{REPLACE} command, @code{mysql_affected_rows()} -will return 2 if the new row replaced an old row. This is because -one row was inserted and then the duplicate was deleted. - -This fact makes it easy to determine whether @code{REPLACE} added -or replaced a row: check whether the affected-rows value is 1 (added) -or 2 (replaced). - -Note that unless you use a @code{UNIQUE} index or @code{PRIMARY KEY}, -using a @code{REPLACE} command makes no sense, since it would just do -an @code{INSERT}. - - -@node LOAD DATA, DO, REPLACE, Data Manipulation -@subsection @code{LOAD DATA INFILE} Syntax - -@findex LOAD DATA INFILE - -@example -LOAD DATA [LOW_PRIORITY | CONCURRENT] [LOCAL] INFILE 'file_name.txt' - [REPLACE | IGNORE] - INTO TABLE tbl_name - [FIELDS - [TERMINATED BY '\t'] - [[OPTIONALLY] ENCLOSED BY ''] - [ESCAPED BY '\\' ] - ] - [LINES TERMINATED BY '\n'] - [IGNORE number LINES] - [(col_name,...)] -@end example - -The @code{LOAD DATA INFILE} statement reads rows from a text file into a -table at a very high speed. If the @code{LOCAL} keyword is specified, the -file is read from the client host. If @code{LOCAL} is not specified, the -file must be located on the server. (@code{LOCAL} is available in -MySQL Version 3.22.6 or later.) - -For security reasons, when reading text files located on the server, the -files must either reside in the database directory or be readable by all. -Also, to use @code{LOAD DATA INFILE} on server files, you must have the -@code{FILE} privilege on the server host. -@xref{Privileges provided}. - -In MySQL 3.23.49 and MySQL 4.0.2 @code{LOCAL} will only work if you have -not started @code{mysqld} with @code{--local-infile=0} or if you -have not enabled your client to support @code{LOCAL}. @xref{LOAD DATA LOCAL}. - -If you specify the keyword @code{LOW_PRIORITY}, execution of the -@code{LOAD DATA} statement is delayed until no other clients are reading -from the table. - -If you specify the keyword @code{CONCURRENT} with a @code{MyISAM} table, -then other threads can retrieve data from the table while @code{LOAD -DATA} is executing. Using this option will of course affect the -performance of @code{LOAD DATA} a bit even if no other thread is using -the table at the same time. - -Using @code{LOCAL} will be a bit slower than letting the server access the -files directly, because the contents of the file must travel from the client -host to the server host. On the other hand, you do not need the -@code{FILE} privilege to load local files. - -@c old version -If you are using MySQL before Version 3.23.24 you can't read from a -FIFO with @code{LOAD DATA INFILE}. If you need to read from a FIFO (for -example the output from gunzip), use @code{LOAD DATA LOCAL INFILE} -instead. - -@cindex @code{mysqlimport} -You can also load datafiles by using the @code{mysqlimport} utility; it -operates by sending a @code{LOAD DATA INFILE} command to the server. The -@code{--local} option causes @code{mysqlimport} to read datafiles from the -client host. You can specify the @code{--compress} option to get better -performance over slow networks if the client and server support the -compressed protocol. - -When locating files on the server host, the server uses the following rules: - -@itemize @bullet -@item -If an absolute pathname is given, the server uses the pathname as is. - -@item -If a relative pathname with one or more leading components is given, -the server searches for the file relative to the server's data directory. - -@item -If a filename with no leading components is given, the server looks for -the file in the database directory of the current database. -@end itemize - -Note that these rules mean a file given as @file{./myfile.txt} is read from -the server's data directory, whereas a file given as @file{myfile.txt} is -read from the database directory of the current database. For example, -the following @code{LOAD DATA} statement reads the file @file{data.txt} -from the database directory for @code{db1} because @code{db1} is the current -database, even though the statement explicitly loads the file into a -table in the @code{db2} database: - -@example -mysql> USE db1; -mysql> LOAD DATA INFILE "data.txt" INTO TABLE db2.my_table; -@end example - -The @code{REPLACE} and @code{IGNORE} keywords control handling of input -records that duplicate existing records on unique key values. If you specify -@code{REPLACE}, new rows replace existing rows that have the same unique key -value. If you specify @code{IGNORE}, input rows that duplicate an existing -row on a unique key value are skipped. If you don't specify either option, an -error occurs when a duplicate key value is found, and the rest of the text -file is ignored. - -If you load data from a local file using the @code{LOCAL} keyword, the server -has no way to stop transmission of the file in the middle of the operation, -so the default behaviour is the same as if @code{IGNORE} is specified. - -If you use @code{LOAD DATA INFILE} on an empty @code{MyISAM} table, -all non-unique indexes are created in a separate batch (like in @code{REPAIR}). -This normally makes @code{LOAD DATA INFILE} much faster when you have many -indexes. - -@code{LOAD DATA INFILE} is the complement of @code{SELECT ... INTO OUTFILE}. -@xref{SELECT, , @code{SELECT}}. -To write data from a database to a file, use @code{SELECT ... INTO OUTFILE}. -To read the file back into the database, use @code{LOAD DATA INFILE}. -The syntax of the @code{FIELDS} and @code{LINES} clauses is the same for -both commands. Both clauses are optional, but @code{FIELDS} -must precede @code{LINES} if both are specified. - -If you specify a @code{FIELDS} clause, -each of its subclauses (@code{TERMINATED BY}, @code{[OPTIONALLY] ENCLOSED -BY}, and @code{ESCAPED BY}) is also optional, except that you must -specify at least one of them. - -If you don't specify a @code{FIELDS} clause, the defaults are the -same as if you had written this: - -@example -FIELDS TERMINATED BY '\t' ENCLOSED BY '' ESCAPED BY '\\' -@end example - -If you don't specify a @code{LINES} clause, the default -is the same as if you had written this: - -@example -LINES TERMINATED BY '\n' -@end example - -In other words, the defaults cause @code{LOAD DATA INFILE} to act as follows -when reading input: - -@itemize @bullet -@item -Look for line boundaries at newlines. - -@item -Break lines into fields at tabs. - -@item -Do not expect fields to be enclosed within any quoting characters. - -@item -Interpret occurrences of tab, newline, or @samp{\} preceded by -@samp{\} as literal characters that are part of field values. -@end itemize - -Conversely, the defaults cause @code{SELECT ... INTO OUTFILE} to act as -follows when writing output: - -@itemize @bullet -@item -Write tabs between fields. - -@item -Do not enclose fields within any quoting characters. - -@item -Use @samp{\} to escape instances of tab, newline or @samp{\} that occur -within field values. - -@item -Write newlines at the ends of lines. -@end itemize - -Note that to write @code{FIELDS ESCAPED BY '\\'}, you must specify two -backslashes for the value to be read as a single backslash. - -The @code{IGNORE number LINES} option can be used to ignore a header of -column names at the start of the file: - -@example -mysql> LOAD DATA INFILE "/tmp/file_name" INTO TABLE test IGNORE 1 LINES; -@end example - -When you use @code{SELECT ... INTO OUTFILE} in tandem with @code{LOAD -DATA INFILE} to write data from a database into a file and then read -the file back into the database later, the field and line handling -options for both commands must match. Otherwise, @code{LOAD DATA -INFILE} will not interpret the contents of the file properly. Suppose -you use @code{SELECT ... INTO OUTFILE} to write a file with -fields delimited by commas: - -@example -mysql> SELECT * INTO OUTFILE 'data.txt' - -> FIELDS TERMINATED BY ',' - -> FROM ...; -@end example - -To read the comma-delimited file back in, the correct statement would be: - -@example -mysql> LOAD DATA INFILE 'data.txt' INTO TABLE table2 - -> FIELDS TERMINATED BY ','; -@end example - -If instead you tried to read in the file with the statement shown here, it -wouldn't work because it instructs @code{LOAD DATA INFILE} to look for -tabs between fields: - -@example -mysql> LOAD DATA INFILE 'data.txt' INTO TABLE table2 - -> FIELDS TERMINATED BY '\t'; -@end example - -The likely result is that each input line would be interpreted as -a single field. - -@code{LOAD DATA INFILE} can be used to read files obtained from -external sources, too. For example, a file in dBASE format will have -fields separated by commas and enclosed in double quotes. If lines in -the file are terminated by newlines, the command shown here -illustrates the field and line handling options you would use to load -the file: - -@example -mysql> LOAD DATA INFILE 'data.txt' INTO TABLE tbl_name - -> FIELDS TERMINATED BY ',' ENCLOSED BY '"' - -> LINES TERMINATED BY '\n'; -@end example - -Any of the field or line handling options may specify an empty string -(@code{''}). If not empty, the @code{FIELDS [OPTIONALLY] ENCLOSED BY} -and @code{FIELDS ESCAPED BY} values must be a single character. The -@code{FIELDS TERMINATED BY} and @code{LINES TERMINATED BY} values may -be more than one character. For example, to write lines that are -terminated by carriage return-linefeed pairs, or to read a file -containing such lines, specify a @code{LINES TERMINATED BY '\r\n'} -clause. - -For example, to read a file of jokes, that are separated with a line -of @code{%%}, into a SQL table you can do: - -@example -CREATE TABLE jokes (a INT NOT NULL AUTO_INCREMENT PRIMARY KEY, joke TEXT -NOT NULL); -LOAD DATA INFILE "/tmp/jokes.txt" INTO TABLE jokes FIELDS TERMINATED BY "" -LINES TERMINATED BY "\n%%\n" (joke); -@end example - -@code{FIELDS [OPTIONALLY] ENCLOSED BY} controls quoting of fields. For -output (@code{SELECT ... INTO OUTFILE}), if you omit the word -@code{OPTIONALLY}, all fields are enclosed by the @code{ENCLOSED BY} -character. An example of such output (using a comma as the field -delimiter) is shown here: - -@example -"1","a string","100.20" -"2","a string containing a , comma","102.20" -"3","a string containing a \" quote","102.20" -"4","a string containing a \", quote and comma","102.20" -@end example - -If you specify @code{OPTIONALLY}, the @code{ENCLOSED BY} character is -used only to enclose @code{CHAR} and @code{VARCHAR} fields: - -@example -1,"a string",100.20 -2,"a string containing a , comma",102.20 -3,"a string containing a \" quote",102.20 -4,"a string containing a \", quote and comma",102.20 -@end example - -Note that occurrences of the @code{ENCLOSED BY} character within a -field value are escaped by prefixing them with the @code{ESCAPED BY} -character. Also note that if you specify an empty @code{ESCAPED BY} -value, it is possible to generate output that cannot be read properly by -@code{LOAD DATA INFILE}. For example, the output just shown above would -appear as shown here if the escape character is empty. Observe that the -second field in the fourth line contains a comma following the quote, which -(erroneously) appears to terminate the field: - -@example -1,"a string",100.20 -2,"a string containing a , comma",102.20 -3,"a string containing a " quote",102.20 -4,"a string containing a ", quote and comma",102.20 -@end example - -For input, the @code{ENCLOSED BY} character, if present, is stripped from the -ends of field values. (This is true whether @code{OPTIONALLY} is -specified; @code{OPTIONALLY} has no effect on input interpretation.) -Occurrences of the @code{ENCLOSED BY} character preceded by the -@code{ESCAPED BY} character are interpreted as part of the current field -value. In addition, duplicated @code{ENCLOSED BY} characters occurring -within fields are interpreted as single @code{ENCLOSED BY} characters if the -field itself starts with that character. For example, if @code{ENCLOSED BY -'"'} is specified, quotes are handled as shown here: - -@example -"The ""BIG"" boss" -> The "BIG" boss -The "BIG" boss -> The "BIG" boss -The ""BIG"" boss -> The ""BIG"" boss -@end example - -@code{FIELDS ESCAPED BY} controls how to write or read special characters. -If the @code{FIELDS ESCAPED BY} character is not empty, it is used to prefix -the following characters on output: -@itemize @bullet -@item -The @code{FIELDS ESCAPED BY} character -@item -The @code{FIELDS [OPTIONALLY] ENCLOSED BY} character -@item -The first character of the @code{FIELDS TERMINATED BY} and -@code{LINES TERMINATED BY} values -@item -ASCII @code{0} (what is actually written following the escape character is -ASCII @code{'0'}, not a zero-valued byte) -@end itemize - -If the @code{FIELDS ESCAPED BY} character is empty, no characters are escaped. -It is probably not a good idea to specify an empty escape character, -particularly if field values in your data contain any of the characters in -the list just given. - -For input, if the @code{FIELDS ESCAPED BY} character is not empty, occurrences -of that character are stripped and the following character is taken literally -as part of a field value. The exceptions are an escaped @samp{0} or -@samp{N} (for example, @code{\0} or @code{\N} if the escape character is -@samp{\}). These sequences are interpreted as ASCII @code{0} (a zero-valued -byte) and @code{NULL}. See below for the rules on @code{NULL} handling. - -For more information about @samp{\}-escape syntax, -see @ref{Literals}. - -In certain cases, field and line handling options interact: - -@itemize @bullet -@item -If @code{LINES TERMINATED BY} is an empty string and @code{FIELDS -TERMINATED BY} is non-empty, lines are also terminated with -@code{FIELDS TERMINATED BY}. -@item -If the @code{FIELDS TERMINATED BY} and @code{FIELDS ENCLOSED BY} values are -both empty (@code{''}), a fixed-row (non-delimited) format is used. With -fixed-row format, no delimiters are used between fields. Instead, column -values are written and read using the ``display'' widths of the columns. For -example, if a column is declared as @code{INT(7)}, values for the column are -written using 7-character fields. On input, values for the column are -obtained by reading 7 characters. Fixed-row format also affects handling of -@code{NULL} values; see below. Note that fixed-size format will not work -if you are using a multi-byte character set. -@end itemize - -Handling of @code{NULL} values varies, depending on the @code{FIELDS} and -@code{LINES} options you use: - -@itemize @bullet -@item -For the default @code{FIELDS} and @code{LINES} values, -@code{NULL} is written as @code{\N} for output and @code{\N} is read -as @code{NULL} for input (assuming the @code{ESCAPED BY} character -is @samp{\}). - -@item -If @code{FIELDS ENCLOSED BY} is not empty, a field containing the literal -word @code{NULL} as its value is read as a @code{NULL} value (this differs -from the word @code{NULL} enclosed within @code{FIELDS ENCLOSED BY} -characters, which is read as the string @code{'NULL'}). - -@item -If @code{FIELDS ESCAPED BY} is empty, @code{NULL} is written as the word -@code{NULL}. - -@item -With fixed-row format (which happens when @code{FIELDS TERMINATED BY} and -@code{FIELDS ENCLOSED BY} are both empty), @code{NULL} is written as an empty -string. Note that this causes both @code{NULL} values and empty strings in -the table to be indistinguishable when written to the file because they are -both written as empty strings. If you need to be able to tell the two apart -when reading the file back in, you should not use fixed-row format. -@end itemize - -Some cases are not supported by @code{LOAD DATA INFILE}: -@itemize @bullet - -@item -Fixed-size rows (@code{FIELDS TERMINATED BY} and @code{FIELDS ENCLOSED -BY} both empty) and @code{BLOB} or @code{TEXT} columns. - -@item -If you specify one separator that is the same as or a prefix of another, -@code{LOAD DATA INFILE} won't be able to interpret the input properly. -For example, the following @code{FIELDS} clause would cause problems: - -@example -FIELDS TERMINATED BY '"' ENCLOSED BY '"' -@end example - -@item -If @code{FIELDS ESCAPED BY} is empty, a field value that contains an occurrence -of @code{FIELDS ENCLOSED BY} or @code{LINES TERMINATED BY} -followed by the @code{FIELDS TERMINATED BY} value will cause @code{LOAD -DATA INFILE} to stop reading a field or line too early. -This happens because @code{LOAD DATA INFILE} cannot properly determine -where the field or line value ends. -@end itemize - -The following example loads all columns of the @code{persondata} table: - -@example -mysql> LOAD DATA INFILE 'persondata.txt' INTO TABLE persondata; -@end example - -No field list is specified, so @code{LOAD DATA INFILE} expects input rows -to contain a field for each table column. The default @code{FIELDS} and -@code{LINES} values are used. - -If you wish to load only some of a table's columns, specify a field list: - -@example -mysql> LOAD DATA INFILE 'persondata.txt' - -> INTO TABLE persondata (col1,col2,...); -@end example - -You must also specify a field list if the order of the fields in the input -file differs from the order of the columns in the table. Otherwise, -MySQL cannot tell how to match up input fields with table columns. - -If a row has too few fields, the columns for which no input field is present -are set to default values. Default value assignment is described in -@ref{CREATE TABLE, , @code{CREATE TABLE}}. - -An empty field value is interpreted differently than if the field value -is missing: - -@itemize @bullet -@item -For string types, the column is set to the empty string. - -@item -For numeric types, the column is set to @code{0}. - -@item -For date and time types, the column is set to the appropriate ``zero'' -value for the type. -@xref{Date and time types}. -@end itemize - -Note that these are the same values that result if you assign an empty -string explicitly to a string, numeric, or date or time type explicitly -in an @code{INSERT} or @code{UPDATE} statement. - -@code{TIMESTAMP} columns are only set to the current date and time if there -is a @code{NULL} value for the column, or (for the first @code{TIMESTAMP} -column only) if the @code{TIMESTAMP} column is left out from the field list -when a field list is specified. - -If an input row has too many fields, the extra fields are ignored and -the number of warnings is incremented. - -@code{LOAD DATA INFILE} regards all input as strings, so you can't use -numeric values for @code{ENUM} or @code{SET} columns the way you can with -@code{INSERT} statements. All @code{ENUM} and @code{SET} values must be -specified as strings! - -@findex mysql_info() -If you are using the C API, you can get information about the query by -calling the API function @code{mysql_info()} when the @code{LOAD DATA INFILE} -query finishes. The format of the information string is shown here: - -@example -Records: 1 Deleted: 0 Skipped: 0 Warnings: 0 -@end example - -Warnings occur under the same circumstances as when values are inserted -via the @code{INSERT} statement (@pxref{INSERT, , @code{INSERT}}), except -that @code{LOAD DATA INFILE} also generates warnings when there are too few -or too many fields in the input row. The warnings are not stored anywhere; -the number of warnings can only be used as an indication if everything went -well. If you get warnings and want to know exactly why you got them, one way -to do this is to use @code{SELECT ... INTO OUTFILE} into another file and -compare this to your original input file. - -If you need @code{LOAD DATA} to read from a pipe, you can use the -following trick: - -@example -mkfifo /mysql/db/x/x -chmod 666 /mysql/db/x/x -cat < /dev/tcp/10.1.1.12/4711 > /nt/mysql/db/x/x -mysql -e "LOAD DATA INFILE 'x' INTO TABLE x" x -@end example - -If you are using a version of MySQL older than 3.23.25 -you can only do the above with @code{LOAD DATA LOCAL INFILE}. - -For more information about the efficiency of @code{INSERT} versus -@code{LOAD DATA INFILE} and speeding up @code{LOAD DATA INFILE}, -@xref{Insert speed}. - - -@node DO, , LOAD DATA, Data Manipulation -@subsection @code{DO} Syntax - -@findex DO - -@example -DO expression, [expression, ...] -@end example - -Execute the expression but don't return any results. This is a -shorthand of @code{SELECT expression, expression}, but has the advantage -that it's slightly faster when you don't care about the result. - -This is mainly useful with functions that has side effects, like -@code{RELEASE_LOCK}. - - -@node Data Definition, Basic User Commands, Data Manipulation, Reference -@section Data Definition: @code{CREATE}, @code{DROP}, @code{ALTER} - -@menu -* CREATE DATABASE:: @code{CREATE DATABASE} Syntax -* DROP DATABASE:: @code{DROP DATABASE} Syntax -* CREATE TABLE:: @code{CREATE TABLE} Syntax -* ALTER TABLE:: @code{ALTER TABLE} Syntax -* RENAME TABLE:: @code{RENAME TABLE} Syntax -* DROP TABLE:: @code{DROP TABLE} Syntax -* CREATE INDEX:: @code{CREATE INDEX} Syntax -* DROP INDEX:: @code{DROP INDEX} Syntax -@end menu - - -@node CREATE DATABASE, DROP DATABASE, Data Definition, Data Definition -@subsection @code{CREATE DATABASE} Syntax - -@findex CREATE DATABASE - -@example -CREATE DATABASE [IF NOT EXISTS] db_name -@end example - -@code{CREATE DATABASE} creates a database with the given name. Rules for -allowable database names are given in @ref{Legal names}. An error occurs if -the database already exists and you didn't specify @code{IF NOT EXISTS}. - -Databases in MySQL are implemented as directories containing files -that correspond to tables in the database. Because there are no tables in a -database when it is initially created, the @code{CREATE DATABASE} statement -only creates a directory under the MySQL data directory. - -@cindex @code{mysqladmin} -You can also create databases with @code{mysqladmin}. -@xref{Client-Side Scripts}. - - -@node DROP DATABASE, CREATE TABLE, CREATE DATABASE, Data Definition -@subsection @code{DROP DATABASE} Syntax - -@findex DROP DATABASE -@cindex deleting, database -@cindex database, deleting - -@example -DROP DATABASE [IF EXISTS] db_name -@end example - -@code{DROP DATABASE} drops all tables in the database and deletes the -database. If you do a @code{DROP DATABASE} on a symbolic linked -database, both the link and the original database is deleted. @strong{Be -VERY careful with this command!} - -@code{DROP DATABASE} returns the number of files that were removed from -the database directory. Normally, this is three times the number of -tables, because normally each table corresponds to a @file{.MYD} file, a -@file{.MYI} file, and a @file{.frm} file. - -The @code{DROP DATABASE} command removes from the given database -directory all files with the following extensions: - -@multitable @columnfractions .10 .10 .10 .10 -@item @strong{Ext} @tab @strong{Ext} @tab @strong{Ext} @tab @strong{Ext} -@item .BAK @tab .DAT @tab .HSH @tab .ISD -@item .ISM @tab .ISM @tab .MRG @tab .MYD -@item .MYI @tab .db @tab .frm @tab -@end multitable - -All subdirectories that consists of 2 digits (@code{RAID} directories) -are also removed. - -In MySQL Version 3.22 or later, you can use the keywords -@code{IF EXISTS} to prevent an error from occurring if the database doesn't -exist. - -@cindex @code{mysqladmin} -You can also drop databases with @code{mysqladmin}. @xref{Client-Side Scripts}. - -@node CREATE TABLE, ALTER TABLE, DROP DATABASE, Data Definition -@subsection @code{CREATE TABLE} Syntax - -@findex CREATE TABLE - -@menu -* Silent column changes:: Silent column changes -@end menu - -@example -CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name [(create_definition,...)] -[table_options] [select_statement] - -create_definition: - col_name type [NOT NULL | NULL] [DEFAULT default_value] [AUTO_INCREMENT] - [PRIMARY KEY] [reference_definition] - or PRIMARY KEY (index_col_name,...) - or KEY [index_name] (index_col_name,...) - or INDEX [index_name] (index_col_name,...) - or UNIQUE [INDEX] [index_name] (index_col_name,...) - or FULLTEXT [INDEX] [index_name] (index_col_name,...) - or [CONSTRAINT symbol] FOREIGN KEY [index_name] (index_col_name,...) - [reference_definition] - or CHECK (expr) - -type: - TINYINT[(length)] [UNSIGNED] [ZEROFILL] - or SMALLINT[(length)] [UNSIGNED] [ZEROFILL] - or MEDIUMINT[(length)] [UNSIGNED] [ZEROFILL] - or INT[(length)] [UNSIGNED] [ZEROFILL] - or INTEGER[(length)] [UNSIGNED] [ZEROFILL] - or BIGINT[(length)] [UNSIGNED] [ZEROFILL] - or REAL[(length,decimals)] [UNSIGNED] [ZEROFILL] - or DOUBLE[(length,decimals)] [UNSIGNED] [ZEROFILL] - or FLOAT[(length,decimals)] [UNSIGNED] [ZEROFILL] - or DECIMAL(length,decimals) [UNSIGNED] [ZEROFILL] - or NUMERIC(length,decimals) [UNSIGNED] [ZEROFILL] - or CHAR(length) [BINARY] - or VARCHAR(length) [BINARY] - or DATE - or TIME - or TIMESTAMP - or DATETIME - or TINYBLOB - or BLOB - or MEDIUMBLOB - or LONGBLOB - or TINYTEXT - or TEXT - or MEDIUMTEXT - or LONGTEXT - or ENUM(value1,value2,value3,...) - or SET(value1,value2,value3,...) - -index_col_name: - col_name [(length)] - -reference_definition: - REFERENCES tbl_name [(index_col_name,...)] - [MATCH FULL | MATCH PARTIAL] - [ON DELETE reference_option] - [ON UPDATE reference_option] - -reference_option: - RESTRICT | CASCADE | SET NULL | NO ACTION | SET DEFAULT - -table_options: - TYPE = @{BDB | HEAP | ISAM | InnoDB | MERGE | MRG_MYISAM | MYISAM @} -or AUTO_INCREMENT = # -or AVG_ROW_LENGTH = # -or CHECKSUM = @{0 | 1@} -or COMMENT = "string" -or MAX_ROWS = # -or MIN_ROWS = # -or PACK_KEYS = @{0 | 1 | DEFAULT@} -or PASSWORD = "string" -or DELAY_KEY_WRITE = @{0 | 1@} -or ROW_FORMAT= @{ default | dynamic | fixed | compressed @} -or RAID_TYPE= @{1 | STRIPED | RAID0 @} RAID_CHUNKS=# RAID_CHUNKSIZE=# -or UNION = (table_name,[table_name...]) -or INSERT_METHOD= @{NO | FIRST | LAST @} -or DATA DIRECTORY="absolute path to directory" -or INDEX DIRECTORY="absolute path to directory" - -select_statement: - [IGNORE | REPLACE] SELECT ... (Some legal select statement) -@end example - -@code{CREATE TABLE} -creates a table with the given name in the current database. Rules for -allowable table names are given in @ref{Legal names}. An error occurs if -there is no current database or if the table already exists. - -In MySQL Version 3.22 or later, the table name can be specified as -@code{db_name.tbl_name}. This works whether there is a current -database. - -In MySQL Version 3.23, you can use the @code{TEMPORARY} keyword when -you create a table. A temporary table will automatically be deleted if a -connection dies and the name is per connection. This means that two different -connections can both use the same temporary table name without conflicting -with each other or with an existing table of the same name. (The existing table -is hidden until the temporary table is deleted.). In MySQL 4.0.2 one must -have the @code{CREATE TEMPORARY TABLES} privilege to be able to create -temporary tables. - -In MySQL Version 3.23 or later, you can use the keywords -@code{IF NOT EXISTS} so that an error does not occur if the table already -exists. Note that there is no verification that the table structures are -identical. - -Each table @code{tbl_name} is represented by some files in the database -directory. In the case of MyISAM-type tables you will get: - -@multitable @columnfractions .20 .30 -@item @strong{File} @tab @strong{Purpose} -@item @code{tbl_name.frm} @tab Table definition (form) file -@item @code{tbl_name.MYD} @tab Datafile -@item @code{tbl_name.MYI} @tab Index file -@end multitable - -For more information on the properties of the various column types, see -@ref{Column types}: - -@itemize @bullet -@item -If neither @code{NULL} nor @code{NOT NULL} is specified, the column -is treated as though @code{NULL} had been specified. - -@item -An integer column may have the additional attribute @code{AUTO_INCREMENT}. -When you insert a value of @code{NULL} (recommended) or @code{0} into an -@code{AUTO_INCREMENT} column, the column is set to @code{value+1}, where -@code{value} is the largest value for the column currently in the table. -@code{AUTO_INCREMENT} sequences begin with @code{1}. -@xref{mysql_insert_id, , @code{mysql_insert_id()}}. - -If you delete the row containing the maximum value for an -@code{AUTO_INCREMENT} column, the value will be reused with an -@code{ISAM}, or @code{BDB} table but not with a -@code{MyISAM} or @code{InnoDB} table. If you delete all rows in the table -with @code{DELETE FROM table_name} (without a @code{WHERE}) in -@code{AUTOCOMMIT} mode, the sequence starts over for all table types. - -@strong{Note}: there can be only one @code{AUTO_INCREMENT} column per -table, and it must be indexed. MySQL Version 3.23 will also only -work properly if the @code{AUTO_INCREMENT} column only has positive -values. Inserting a negative number is regarded as inserting a very large -positive number. This is done to avoid precision problems when -numbers 'wrap' over from positive to negative and also to ensure that one -doesn't accidentally get an @code{AUTO_INCREMENT} column that contains 0. - -In MyISAM and BDB tables you can specify @code{AUTO_INCREMENT} secondary -column in a multi-column key. @xref{example-AUTO_INCREMENT}. - -@cindex ODBC compatibility -@cindex compatibility, with ODBC -To make MySQL compatible with some ODBC applications, you can find -the last inserted row with the following query: - -@example -SELECT * FROM tbl_name WHERE auto_col IS NULL -@end example - -@item -@code{CREATE TABLE} automatically commits the current InnoDB -transaction if the MySQL binlogging is used. - -@item -@code{NULL} values are handled differently for @code{TIMESTAMP} columns than -for other column types. You cannot store a literal @code{NULL} in a -@code{TIMESTAMP} column; setting the column to @code{NULL} sets it to the -current date and time. Because @code{TIMESTAMP} columns behave this way, the -@code{NULL} and @code{NOT NULL} attributes do not apply in the normal way and -are ignored if you specify them. - -On the other hand, to make it easier for MySQL clients to use -@code{TIMESTAMP} columns, the server reports that such columns may be -assigned @code{NULL} values (which is true), even though @code{TIMESTAMP} -never actually will contain a @code{NULL} value. You can see this when you -use @code{DESCRIBE tbl_name} to get a description of your table. - -Note that setting a @code{TIMESTAMP} column to @code{0} is not the same -as setting it to @code{NULL}, because @code{0} is a valid @code{TIMESTAMP} -value. - -@item -@cindex default values -A @code{DEFAULT} value has to be a constant, it can not be a function or -an expression. - -If no @code{DEFAULT} value is specified for a column, MySQL -automatically assigns one. - -If the column may take @code{NULL} as a value, the default value is -@code{NULL}. - -If the column is declared as @code{NOT NULL}, the default value depends on -the column type: - -@itemize @minus -@item -For numeric types other than those declared with the @code{AUTO_INCREMENT} -attribute, the default is @code{0}. For an @code{AUTO_INCREMENT} column, the -default value is the next value in the sequence. - -@item -For date and time types other than @code{TIMESTAMP}, the default is the -appropriate zero value for the type. For the first @code{TIMESTAMP} -column in a table, the default value is the current date and time. -@xref{Date and time types}. - -@item -For string types other than @code{ENUM}, the default value is the empty -string. For @code{ENUM}, the default is the first enumeration value (if -you haven't explicitly specified another default value with the -@code{DEFAULT} directive). -@end itemize - -Default values must be constants. This means, for example, that you cannot -set the default for a date column to be the value of a function such as -@code{NOW()} or @code{CURRENT_DATE}. - -@item -@code{KEY} is a synonym for @code{INDEX}. - -@item -In MySQL, a @code{UNIQUE} key can have only distinct values. An -error occurs if you try to add a new row with a key that matches an existing -row. - -@item -@tindex PRIMARY KEY -A @code{PRIMARY KEY} is a unique @code{KEY} with the extra constraint -that all key columns must be defined as @code{NOT NULL}. In MySQL -the key is named @code{PRIMARY}. A table can have only one @code{PRIMARY KEY}. -If you don't have a @code{PRIMARY KEY} and some applications ask for the -@code{PRIMARY KEY} in your tables, MySQL will return the first -@code{UNIQUE} key, which doesn't have any @code{NULL} columns, as the -@code{PRIMARY KEY}. - -@item -A @code{PRIMARY KEY} can be a multiple-column index. However, you cannot -create a multiple-column index using the @code{PRIMARY KEY} key attibute in a -column specification. Doing so will mark only that single column as primary. -You must use the @code{PRIMARY KEY(index_col_name, ...)} syntax. - -@item -If the @code{PRIMARY} or @code{UNIQUE} key consists of only one column and this -is of type integer, you can also refer to it as @code{_rowid} -(new in Version 3.23.11). - -@item -If you don't assign a name to an index, the index will be assigned the same -name as the first @code{index_col_name}, with an optional suffix (@code{_2}, -@code{_3}, @code{...}) to make it unique. You can see index names for a -table using @code{SHOW INDEX FROM tbl_name}. -@xref{SHOW, , @code{SHOW}}. - -@item -@cindex @code{NULL} values, and indexes -@cindex indexes, and @code{NULL} values -Only the @code{MyISAM}, @code{InnoDB}, and @code{BDB} table types support indexes on columns that can have -@code{NULL} values. In other cases you must declare such columns -@code{NOT NULL} or an error results. - -@item -With @code{col_name(length)} syntax, you can specify an index that -uses only a part of a @code{CHAR} or @code{VARCHAR} column. This can -make the index file much smaller. -@xref{Indexes}. - -@item -@cindex @code{BLOB} columns, indexing -@cindex indexes, and @code{BLOB} columns -@cindex @code{TEXT} columns, indexing -@cindex indexes, and @code{TEXT} columns -Only the @code{MyISAM} table type supports indexing on @code{BLOB} and -@code{TEXT} columns. When putting an index on a @code{BLOB} or @code{TEXT} -column you MUST always specify the length of the index: -@example -CREATE TABLE test (blob_col BLOB, INDEX(blob_col(10))); -@end example - -@item -When you use @code{ORDER BY} or @code{GROUP BY} with a @code{TEXT} or -@code{BLOB} column, only the first @code{max_sort_length} bytes are used. -@xref{BLOB, , @code{BLOB}}. - -@item -In MySQL Version 3.23.23 or later, you can also create special -@code{FULLTEXT} indexes. They are used for full-text search. Only the -@code{MyISAM} table type supports @code{FULLTEXT} indexes. They can be created -only from @code{VARCHAR} and @code{TEXT} columns. -Indexing always happens over the entire column, partial indexing is not -supported. See @ref{Fulltext Search} for details of operation. - -@item -In MySQL Version 3.23.44 or later, @code{InnoDB} tables support checking of -foreign key constraints. @xref{InnoDB}. Note that the -@code{FOREIGN KEY} syntax in InnoDB is more restricted than -the syntax presented above. InnoDB does not allow -@code{index_name} to be specified, and the columns of the referenced -table always have to be explicitly named. Of actions, InnoDB supports -only @code{ON DELETE CASCADE} and @code{ON DELETE SET NULL}. -See the InnoDB manual section for the precise syntax. -For other table types, MySQL Server does parse the @code{FOREIGN KEY}, -@code{CHECK}, and @code{REFERENCES} syntax in @code{CREATE TABLE} commands, -but without further action being taken. @xref{ANSI diff Foreign Keys}. - -@item -Each @code{NULL} column takes one bit extra, rounded up to the nearest byte. - -@item -The maximum record length in bytes can be calculated as follows: - -@example -row length = 1 - + (sum of column lengths) - + (number of NULL columns + 7)/8 - + (number of variable-length columns) -@end example - -@item -The @code{table_options} and @code{SELECT} options are only -implemented in MySQL Version 3.23 and above. - -The different table types are: - -@multitable @columnfractions .25 .70 -@item @strong{Table type} @tab @strong{Description} -@item BDB or BerkeleyDB @tab Transaction-safe tables with page locking. @xref{BDB}. -@item HEAP @tab The data for this table is only stored in memory. @xref{HEAP}. -@item ISAM @tab The original table handler. @xref{ISAM}. -@item InnoDB @tab Transaction-safe tables with row locking. @xref{InnoDB}. -@item MERGE @tab A collection of MyISAM tables used as one table. @xref{MERGE}. -@item MRG_MyISAM @tab An alias for MERGE tables -@item MyISAM @tab The new binary portable table handler that is replacing ISAM. @xref{MyISAM}. -@end multitable -@xref{Table types}. - -If a table type is specified, and that particular type is not available, -MySQL will choose the closest table type to the one that you have -specified. For example, if @code{TYPE=BDB} is specified, and that distribution -of MySQL does not support @code{BDB} tables, the table will be created -as @code{MyISAM} instead. - -The other table options are used to optimise the behaviour of the -table. In most cases, you don't have to specify any of them. -The options work for all table types, if not otherwise indicated: - -@multitable @columnfractions .25 .70 -@item @strong{Option} @tab @strong{Description} -@item @code{AUTO_INCREMENT} @tab The next @code{AUTO_INCREMENT} value you want to set for your table (MyISAM). -@item @code{AVG_ROW_LENGTH} @tab An approximation of the average row length for your table. You only need to set this for large tables with variable size records. -@item @code{CHECKSUM} @tab Set this to 1 if you want MySQL to maintain a checksum for all rows (makes the table a little slower to update but makes it easier to find corrupted tables) (MyISAM). -@item @code{COMMENT} @tab A 60-character comment for your table. -@item @code{MAX_ROWS} @tab Max number of rows you plan to store in the table. -@item @code{MIN_ROWS} @tab Minimum number of rows you plan to store in the table. -@item @code{PACK_KEYS} @tab Set this to 1 if you want to have a smaller index. This usually makes updates slower and reads faster (MyISAM, ISAM). Setting this to 0 will disable all packing of keys. Setting this to @code{DEFAULT} (MySQL 4.0) will tell the table handler to only pack long @code{CHAR}/@code{VARCHAR} columns. -@item @code{PASSWORD} @tab Encrypt the @file{.frm} file with a password. This option doesn't do anything in the standard MySQL version. -@item @code{DELAY_KEY_WRITE} @tab Set this to 1 if want to delay key table updates until the table is closed (MyISAM). -@item @code{ROW_FORMAT} @tab Defines how the rows should be stored. Currently this option only works with MyISAM tables, which supports the @code{DYNAMIC} and @code{FIXED} row formats. @xref{MyISAM table formats}. -@end multitable - -When you use a @code{MyISAM} table, MySQL uses the product of -@code{max_rows * avg_row_length} to decide how big the resulting table -will be. If you don't specify any of the above options, the maximum size -for a table will be 4G (or 2G if your operating systems only supports 2G -tables). The reason for this is just to keep down the pointer sizes -to make the index smaller and faster if you don't really need big files. - -If you don't use @code{PACK_KEYS}, the default is to only pack strings, -not numbers. If you use @code{PACK_KEYS=1}, numbers will be packed as well. - -When packing binary number keys, MySQL will use prefix compression. -This means that you will only get a big benefit of this if you have -many numbers that are the same. Prefix compression means that every -key needs one extra byte to indicate how many bytes of the previous key are -the same for the next key (note that the pointer to the row is stored -in high-byte-first-order directly after the key, to improve -compression). This means that if you have many equal keys on two rows -in a row, all following 'same' keys will usually only take 2 bytes -(including the pointer to the row). Compare this to the ordinary case -where the following keys will take storage_size_for_key + -pointer_size (usually 4). On the other hand, if all keys are -totally different, you will lose 1 byte per key, if the key isn't a -key that can have @code{NULL} values. (In this case the packed key length will -be stored in the same byte that is used to mark if a key is @code{NULL}.) - -@item -If you specify a @code{SELECT} after the @code{CREATE} statement, -MySQL will create new fields for all elements in the -@code{SELECT}. For example: - -@example -mysql> CREATE TABLE test (a INT NOT NULL AUTO_INCREMENT, - -> PRIMARY KEY (a), KEY(b)) - -> TYPE=MyISAM SELECT b,c FROM test2; -@end example - -This will create a @code{MyISAM} table with three columns, a, b, and c. -Notice that the columns from the @code{SELECT} statement are appended to -the right side of the table, not overlapped onto it. Take the following -example: - -@example -mysql> SELECT * FROM foo; -+---+ -| n | -+---+ -| 1 | -+---+ - -mysql> CREATE TABLE bar (m INT) SELECT n FROM foo; -Query OK, 1 row affected (0.02 sec) -Records: 1 Duplicates: 0 Warnings: 0 - -mysql> SELECT * FROM bar; -+------+---+ -| m | n | -+------+---+ -| NULL | 1 | -+------+---+ -1 row in set (0.00 sec) -@end example - -For each row in table @code{foo}, a row is inserted in @code{bar} with -the values from @code{foo} and default values for the new columns. - -@code{CREATE TABLE ... SELECT} will not automatically create any indexes -for you. This is done intentionally to make the command as flexible as -possible. If you want to have indexes in the created table, you should -specify these before the @code{SELECT} statement: - -@example -mysql> CREATE TABLE bar (UNIQUE (n)) SELECT n FROM foo; -@end example - -If any errors occur while copying the data to the table, it will -automatically be deleted. - -To ensure that the update log/binary log can be used to re-create the -original tables, MySQL will not allow concurrent inserts during -@code{CREATE TABLE ... SELECT}. -@item -The @code{RAID_TYPE} option will help you to break the 2G/4G limit for -the MyISAM datafile (not the index file) on operating systems that -don't support big files. Note that this option is not recommended for -filesystem that supports big files! - -You can get more speed from the I/O bottleneck by putting @code{RAID} -directories on different physical disks. @code{RAID_TYPE} will work on -any OS, as long as you have configured MySQL with @code{--with-raid}. -For now the only allowed @code{RAID_TYPE} is @code{STRIPED} (@code{1} -and @code{RAID0} are aliases for this). - -If you specify @code{RAID_TYPE=STRIPED} for a @code{MyISAM} table, -@code{MyISAM} will create @code{RAID_CHUNKS} subdirectories named 00, -01, 02 in the database directory. In each of these directories -@code{MyISAM} will create a @code{table_name.MYD}. When writing data -to the datafile, the @code{RAID} handler will map the first -@code{RAID_CHUNKSIZE} *1024 bytes to the first file, the next -@code{RAID_CHUNKSIZE} *1024 bytes to the next file and so on. -@item -@code{UNION} is used when you want to use a collection of identical -tables as one. This only works with @code{MERGE} tables. -@xref{MERGE, , @code{MERGE}}. - -For the moment you need to have @code{SELECT}, @code{UPDATE}, and -@code{DELETE} privileges on the tables you map to a @code{MERGE} table. -All mapped tables must be in the same database as the @code{MERGE} table. - -@item -If you want to insert data in a @code{MERGE} table, you have to specify with -@code{INSERT_METHOD} into with table the row should be inserted. -@xref{MERGE}. This option was introduced in MySQL 4.0.0. - -@item -In the created table the @code{PRIMARY} key will be placed first, followed -by all @code{UNIQUE} keys and then the normal keys. This helps the -MySQL optimiser to prioritise which key to use and also more quickly -detect duplicated @code{UNIQUE} keys. - -@item -By using @code{DATA DIRECTORY="directory"} or @code{INDEX -DIRECTORY="directory"} you can specify where the table handler should -put it's table and index files. Note that the directory should be a full -path to the directory (not relative path). - -This only works for @code{MyISAM} tables in @code{MySQL} 4.0, when you -are not using the @code{--skip-symlink} option. @xref{Symbolic links to -tables}. -@end itemize - - -@node Silent column changes, , CREATE TABLE, CREATE TABLE -@subsubsection Silent Column Specification Changes - -@cindex silent column changes - -In some cases, MySQL silently changes a column specification from -that given in a @code{CREATE TABLE} statement. (This may also occur with -@code{ALTER TABLE}.): - -@itemize @bullet -@item -@code{VARCHAR} columns with a length less than four are changed to -@code{CHAR}. - -@item -If any column in a table has a variable length, the entire row is -variable-length as a result. Therefore, if a table contains any -variable-length columns (@code{VARCHAR}, @code{TEXT}, or @code{BLOB}), -all @code{CHAR} columns longer than three characters are changed to -@code{VARCHAR} columns. This doesn't affect how you use the columns in -any way; in MySQL, @code{VARCHAR} is just a different way to -store characters. MySQL performs this conversion because it -saves space and makes table operations faster. @xref{Table types}. - -@item -@code{TIMESTAMP} display sizes must be even and in the range from 2 to 14. -If you specify a display size of 0 or greater than 14, the size is coerced -to 14. Odd-valued sizes in the range from 1 to 13 are coerced -to the next higher even number. - -@item -You cannot store a literal @code{NULL} in a @code{TIMESTAMP} column; setting -it to @code{NULL} sets it to the current date and time. Because -@code{TIMESTAMP} columns behave this way, the @code{NULL} and @code{NOT NULL} -attributes do not apply in the normal way and are ignored if you specify -them. @code{DESCRIBE tbl_name} always reports that a @code{TIMESTAMP} -column may be assigned @code{NULL} values. - -@item -MySQL maps certain column types used by other SQL database vendors -to MySQL types. @xref{Other-vendor column types}. -@end itemize - -If you want to see whether MySQL used a column type other -than the one you specified, issue a @code{DESCRIBE tbl_name} statement after -creating or altering your table. - -@cindex @code{myisampack} -Certain other column type changes may occur if you compress a table -using @code{myisampack}. @xref{Compressed format}. - - -@node ALTER TABLE, RENAME TABLE, CREATE TABLE, Data Definition -@subsection @code{ALTER TABLE} Syntax - -@findex ALTER TABLE -@cindex changing, table -@cindex table, changing - -@example -ALTER [IGNORE] TABLE tbl_name alter_spec [, alter_spec ...] - -alter_specification: - ADD [COLUMN] create_definition [FIRST | AFTER column_name ] - or ADD [COLUMN] (create_definition, create_definition,...) - or ADD INDEX [index_name] (index_col_name,...) - or ADD PRIMARY KEY (index_col_name,...) - or ADD UNIQUE [index_name] (index_col_name,...) - or ADD FULLTEXT [index_name] (index_col_name,...) - or ADD [CONSTRAINT symbol] FOREIGN KEY [index_name] (index_col_name,...) - [reference_definition] - or ALTER [COLUMN] col_name @{SET DEFAULT literal | DROP DEFAULT@} - or CHANGE [COLUMN] old_col_name create_definition - [FIRST | AFTER column_name] - or MODIFY [COLUMN] create_definition [FIRST | AFTER column_name] - or DROP [COLUMN] col_name - or DROP PRIMARY KEY - or DROP INDEX index_name - or DISABLE KEYS - or ENABLE KEYS - or RENAME [TO] new_tbl_name - or ORDER BY col - or table_options -@end example - -@code{ALTER TABLE} allows you to change the structure of an existing table. -For example, you can add or delete columns, create or destroy indexes, change -the type of existing columns, or rename columns or the table itself. You can -also change the comment for the table and type of the table. -@xref{CREATE TABLE, , @code{CREATE TABLE}}. - -If you use @code{ALTER TABLE} to change a column specification but -@code{DESCRIBE tbl_name} indicates that your column was not changed, it is -possible that MySQL ignored your modification for one of the reasons -described in @ref{Silent column changes}. For example, if you try to change -a @code{VARCHAR} column to @code{CHAR}, MySQL will still use -@code{VARCHAR} if the table contains other variable-length columns. - -@code{ALTER TABLE} works by making a temporary copy of the original table. -The alteration is performed on the copy, then the original table is -deleted and the new one is renamed. This is done in such a way that -all updates are automatically redirected to the new table without -any failed updates. While @code{ALTER TABLE} is executing, the original -table is readable by other clients. Updates and writes to the table -are stalled until the new table is ready. - -Note that if you use any other option to @code{ALTER TABLE} than -@code{RENAME}, MySQL will always create a temporary table, even -if the data wouldn't strictly need to be copied (like when you change the -name of a column). We plan to fix this in the future, but as one doesn't -normally do @code{ALTER TABLE} that often this isn't that high on our TODO. -For MyISAM tables, you can speed up the index recreation part (which is the -slowest part of the recreation process) by setting the -@code{myisam_sort_buffer_size} variable to a high value. - -@itemize @bullet -@item -To use @code{ALTER TABLE}, you need @code{ALTER}, @code{INSERT}, -and @code{CREATE} privileges on the table. - -@item -@code{IGNORE} is a MySQL extension to ANSI SQL92. -It controls how @code{ALTER TABLE} works if there are duplicates on -unique keys in the new table. -If @code{IGNORE} isn't specified, the copy is aborted and rolled back. -If @code{IGNORE} is specified, then for rows with duplicates on a unique -key, only the first row is used; the others are deleted. - -@item -You can issue multiple @code{ADD}, @code{ALTER}, @code{DROP}, and -@code{CHANGE} clauses in a single @code{ALTER TABLE} statement. This is a -MySQL extension to ANSI SQL92, which allows only one of each clause -per @code{ALTER TABLE} statement. - -@item -@code{CHANGE col_name}, @code{DROP col_name}, and @code{DROP -INDEX} are MySQL extensions to ANSI SQL92. - -@item -@code{MODIFY} is an Oracle extension to @code{ALTER TABLE}. - -@item -The optional word @code{COLUMN} is a pure noise word and can be omitted. - -@item -If you use @code{ALTER TABLE tbl_name RENAME TO new_name} without any other -options, MySQL simply renames the files that correspond to the table -@code{tbl_name}. There is no need to create the temporary table. -@xref{RENAME TABLE,, @code{RENAME TABLE}}. - -@item -@code{create_definition} clauses use the same syntax for @code{ADD} and -@code{CHANGE} as for @code{CREATE TABLE}. Note that this syntax includes -the column name, not just the column type. -@xref{CREATE TABLE, , @code{CREATE TABLE}}. - -@item -You can rename a column using a @code{CHANGE old_col_name create_definition} -clause. To do so, specify the old and new column names and the type that -the column currently has. For example, to rename an @code{INTEGER} column -from @code{a} to @code{b}, you can do this: - -@example -mysql> ALTER TABLE t1 CHANGE a b INTEGER; -@end example - -If you want to change a column's type but not the name, @code{CHANGE} -syntax still requires two column names even if they are the same. For -example: - -@example -mysql> ALTER TABLE t1 CHANGE b b BIGINT NOT NULL; -@end example - -However, as of MySQL Version 3.22.16a, you can also use @code{MODIFY} -to change a column's type without renaming it: - -@example -mysql> ALTER TABLE t1 MODIFY b BIGINT NOT NULL; -@end example - -@item -If you use @code{CHANGE} or @code{MODIFY} to shorten a column for which -an index exists on part of the column (for instance, if you have an index -on the first 10 characters of a @code{VARCHAR} column), you cannot make -the column shorter than the number of characters that are indexed. - -@item -When you change a column type using @code{CHANGE} or @code{MODIFY}, -MySQL tries to convert data to the new type as well as possible. - -@item -In MySQL Version 3.22 or later, you can use @code{FIRST} or -@code{ADD ... AFTER col_name} to add a column at a specific position -within a table row. The default is to add the column last. -From MySQL Version 4.0.1, you can also use the @code{FIRST} and -@code{AFTER} keywords in @code{CHANGE} or @code{MODIFY}. - -@findex ALTER COLUMN -@cindex changing, column -@cindex column, changing -@cindex changing, field -@cindex field, changing -@item -@code{ALTER COLUMN} specifies a new default value for a column -or removes the old default value. -If the old default is removed and the column can be @code{NULL}, the new -default is @code{NULL}. If the column cannot be @code{NULL}, MySQL -assigns a default value, as described in -@ref{CREATE TABLE, , @code{CREATE TABLE}}. - -@findex DROP INDEX -@cindex deleting, index -@cindex index, deleting -@item -@code{DROP INDEX} removes an index. This is a MySQL extension to -ANSI SQL92. @xref{DROP INDEX}. - -@item -If columns are dropped from a table, the columns are also removed from any -index of which they are a part. If all columns that make up an index are -dropped, the index is dropped as well. - -@item -If a table contains only one column, the column cannot be dropped. -If what you intend is to remove the table, use @code{DROP TABLE} instead. - -@findex DROP PRIMARY KEY -@cindex deleting, primary key -@cindex primary key, deleting -@item -@code{DROP PRIMARY KEY} drops the primary index. If no such -index exists, it drops the first @code{UNIQUE} index in the table. -(MySQL marks the first @code{UNIQUE} key as the @code{PRIMARY KEY} -if no @code{PRIMARY KEY} was specified explicitly.) - -@findex UNIQUE -@findex PRIMARY KEY -If you add a @code{UNIQUE INDEX} or @code{PRIMARY KEY} to a table, this -is stored before any not @code{UNIQUE} index so that MySQL can detect -duplicate keys as early as possible. - -@findex ORDER BY -@item -@code{ORDER BY} allows you to create the new table with the rows in a -specific order. Note that the table will not remain in this order after -inserts and deletes. In some cases, it may make sorting easier for -MySQL if the table is in order by the column that you wish to -order it by later. This option is mainly useful when you know that you -are mostly going to query the rows in a certain order; by using this -option after big changes to the table, you may be able to get higher -performance. - -@findex ALTER TABLE -@cindex changing, table -@cindex table, changing -@item -If you use @code{ALTER TABLE} on a @code{MyISAM} table, all non-unique -indexes are created in a separate batch (like in @code{REPAIR}). -This should make @code{ALTER TABLE} much faster when you have many indexes. - -@item -Since @strong{MySQL 4.0} the above feature can be activated explicitly. -@code{ALTER TABLE ... DISABLE KEYS} makes MySQL to stop updating -non-unique indexes for @code{MyISAM} table. -@code{ALTER TABLE ... ENABLE KEYS} then should be used to recreate missing -indexes. As MySQL does it with special algorithm which is much -faster then inserting keys one by one, disabling keys could give a -considerable speedup on bulk inserts. - -@item -@findex mysql_info() -With the C API function @code{mysql_info()}, you can find out how many -records were copied, and (when @code{IGNORE} is used) how many records were -deleted due to duplication of unique key values. - -@item -@cindex foreign keys -@cindex references -The @code{FOREIGN KEY}, @code{CHECK}, and @code{REFERENCES} clauses don't -actually do anything, except for InnoDB type tables which support -@code{ADD CONSTRAINT FOREIGN KEY (...) REFERENCES ... (...)}. -Note that InnoDB does not allow an @code{index_name} -to be specified. @xref{InnoDB}. -The syntax for other table types is provided only for compatibility, -to make it easier to port code from other SQL servers and to run applications -that create tables with references. -@xref{Differences from ANSI}. -@end itemize - -Here is an example that shows some of the uses of @code{ALTER TABLE}. We -begin with a table @code{t1} that is created as shown here: - -@example -mysql> CREATE TABLE t1 (a INTEGER,b CHAR(10)); -@end example - -To rename the table from @code{t1} to @code{t2}: - -@example -mysql> ALTER TABLE t1 RENAME t2; -@end example - -To change column @code{a} from @code{INTEGER} to @code{TINYINT NOT NULL} -(leaving the name the same), and to change column @code{b} from -@code{CHAR(10)} to @code{CHAR(20)} as well as renaming it from @code{b} to -@code{c}: - -@example -mysql> ALTER TABLE t2 MODIFY a TINYINT NOT NULL, CHANGE b c CHAR(20); -@end example - -To add a new @code{TIMESTAMP} column named @code{d}: - -@example -mysql> ALTER TABLE t2 ADD d TIMESTAMP; -@end example - -To add an index on column @code{d}, and make column @code{a} the primary key: - -@example -mysql> ALTER TABLE t2 ADD INDEX (d), ADD PRIMARY KEY (a); -@end example - -To remove column @code{c}: - -@example -mysql> ALTER TABLE t2 DROP COLUMN c; -@end example - -To add a new @code{AUTO_INCREMENT} integer column named @code{c}: - -@example -mysql> ALTER TABLE t2 ADD c INT UNSIGNED NOT NULL AUTO_INCREMENT, - ADD INDEX (c); -@end example - -Note that we indexed @code{c}, because @code{AUTO_INCREMENT} columns must be -indexed, and also that we declare @code{c} as @code{NOT NULL}, because -indexed columns cannot be @code{NULL}. - -When you add an @code{AUTO_INCREMENT} column, column values are filled in -with sequence numbers for you automatically. You can set the first -sequence number by executing @code{SET INSERT_ID=#} before -@code{ALTER TABLE} or using the @code{AUTO_INCREMENT = #} table option. -@xref{SET OPTION}. - -With MyISAM tables, if you don't change the @code{AUTO_INCREMENT} -column, the sequence number will not be affected. If you drop an -@code{AUTO_INCREMENT} column and then add another @code{AUTO_INCREMENT} -column, the numbers will start from 1 again. - -@xref{ALTER TABLE problems}. - - -@node RENAME TABLE, DROP TABLE, ALTER TABLE, Data Definition -@subsection @code{RENAME TABLE} Syntax - -@findex RENAME TABLE - -@example -RENAME TABLE tbl_name TO new_tbl_name[, tbl_name2 TO new_tbl_name2,...] -@end example - -The rename is done atomically, which means that no other thread can -access any of the tables while the rename is running. This makes it -possible to replace a table with an empty one: - -@example -CREATE TABLE new_table (...); -RENAME TABLE old_table TO backup_table, new_table TO old_table; -@end example - -The rename is done from left to right, which means that if you want to -swap two tables names, you have to: - -@example -RENAME TABLE old_table TO backup_table, - new_table TO old_table, - backup_table TO new_table; -@end example - -As long as two databases are on the same disk you can also rename -from one database to another: - -@example -RENAME TABLE current_db.tbl_name TO other_db.tbl_name; -@end example - -When you execute @code{RENAME}, you can't have any locked tables or -active transactions. You must also have the @code{ALTER} and @code{DROP} -privileges on the original table, and the @code{CREATE} and @code{INSERT} -privileges on the new table. - -If MySQL encounters any errors in a multiple-table rename, it -will do a reverse rename for all renamed tables to get everything back -to the original state. - -@code{RENAME TABLE} was added in MySQL 3.23.23. - -@node DROP TABLE, CREATE INDEX, RENAME TABLE, Data Definition -@subsection @code{DROP TABLE} Syntax - -@findex DROP TABLE -@cindex deleting, table -@cindex table, deleting - -@example -DROP TABLE [IF EXISTS] tbl_name [, tbl_name,...] [RESTRICT | CASCADE] -@end example - -@code{DROP TABLE} removes one or more tables. All table data and the table -definition are @emph{removed}, so @strong{be careful} with this command! - -In MySQL Version 3.22 or later, you can use the keywords -@code{IF EXISTS} to prevent an error from occurring for tables that don't -exist. - -@code{RESTRICT} and @code{CASCADE} are allowed to make porting easier. -For the moment they don't do anything. - -@strong{Note}: @code{DROP TABLE} will -automatically commit current active transaction. - - -@node CREATE INDEX, DROP INDEX, DROP TABLE, Data Definition -@subsection @code{CREATE INDEX} Syntax - -@findex CREATE INDEX - -@cindex indexes -@cindex indexes, multi-part -@cindex multi-part index - -@example -CREATE [UNIQUE|FULLTEXT] INDEX index_name - ON tbl_name (col_name[(length)],... ) -@end example - -The @code{CREATE INDEX} statement doesn't do anything in MySQL prior -to Version 3.22. In Version 3.22 or later, @code{CREATE INDEX} is mapped to an -@code{ALTER TABLE} statement to create indexes. -@xref{ALTER TABLE, , @code{ALTER TABLE}}. - -Normally, you create all indexes on a table at the time the table itself -is created with @code{CREATE TABLE}. -@xref{CREATE TABLE, , @code{CREATE TABLE}}. -@code{CREATE INDEX} allows you to add indexes to existing tables. - -A column list of the form @code{(col1,col2,...)} creates a multiple-column -index. Index values are formed by concatenating the values of the given -columns. - -For @code{CHAR} and @code{VARCHAR} columns, indexes can be created that -use only part of a column, using @code{col_name(length)} syntax. (On -@code{BLOB} and @code{TEXT} columns the length is required.) The -statement shown here creates an index using the first 10 characters of -the @code{name} column: - -@example -mysql> CREATE INDEX part_of_name ON customer (name(10)); -@end example - -Because most names usually differ in the first 10 characters, this index should -not be much slower than an index created from the entire @code{name} column. -Also, using partial columns for indexes can make the index file much smaller, -which could save a lot of disk space and might also speed up @code{INSERT} -operations! - -Note that you can only add an index on a column that can have @code{NULL} -values or on a @code{BLOB}/@code{TEXT} column if you are using -MySQL Version 3.23.2 or newer and are using the @code{MyISAM} -table type. - -For more information about how MySQL uses indexes, see -@ref{MySQL indexes, , MySQL indexes}. - -@code{FULLTEXT} indexes can index only @code{VARCHAR} and -@code{TEXT} columns, and only in @code{MyISAM} tables. @code{FULLTEXT} indexes -are available in MySQL Version 3.23.23 and later. -@ref{Fulltext Search}. - - -@node DROP INDEX, , CREATE INDEX, Data Definition -@subsection @code{DROP INDEX} Syntax - -@findex DROP INDEX -@cindex deleting, index -@cindex index, deleting - -@example -DROP INDEX index_name ON tbl_name -@end example - -@code{DROP INDEX} drops the index named @code{index_name} from the table -@code{tbl_name}. @code{DROP INDEX} doesn't do anything in MySQL -prior to Version 3.22. In Version 3.22 or later, @code{DROP INDEX} is mapped to an -@code{ALTER TABLE} statement to drop the index. -@xref{ALTER TABLE, , @code{ALTER TABLE}}. - - -@node Basic User Commands, Transactional Commands, Data Definition, Reference -@section Basic MySQL User Utility Commands - -@menu -* USE:: @code{USE} Syntax -* DESCRIBE:: @code{DESCRIBE} Syntax (Get Information About Columns) -@end menu - - -@node USE, DESCRIBE, Basic User Commands, Basic User Commands -@subsection @code{USE} Syntax - -@findex USE - -@example -USE db_name -@end example - -The @code{USE db_name} statement tells MySQL to use the @code{db_name} -database as the default database for subsequent queries. The database remains -current until the end of the session or until another @code{USE} statement -is issued: - -@example -mysql> USE db1; -mysql> SELECT COUNT(*) FROM mytable; # selects from db1.mytable -mysql> USE db2; -mysql> SELECT COUNT(*) FROM mytable; # selects from db2.mytable -@end example - -Making a particular database current by means of the @code{USE} statement -does not preclude you from accessing tables in other databases. The following example -accesses the @code{author} table from the @code{db1} database and the -@code{editor} table from the @code{db2} database: - -@example -mysql> USE db1; -mysql> SELECT author_name,editor_name FROM author,db2.editor - -> WHERE author.editor_id = db2.editor.editor_id; -@end example - -@cindex Sybase compatibility -@cindex compatibility, with Sybase -The @code{USE} statement is provided for Sybase compatibility. - - -@node DESCRIBE, , USE, Basic User Commands -@subsection @code{DESCRIBE} Syntax (Get Information About Columns) - -@findex DESC -@findex DESCRIBE - -@example -@{DESCRIBE | DESC@} tbl_name @{col_name | wild@} -@end example - -@code{DESCRIBE} is a shortcut for @code{SHOW COLUMNS FROM}. -@xref{SHOW DATABASE INFO}. - -@code{DESCRIBE} provides information about a table's columns. @code{col_name} -may be a column name or a string containing the SQL @samp{%} and @samp{_} -wildcard characters. - -If the column types are different from what you expect them to be based on a -@code{CREATE TABLE} statement, note that MySQL sometimes -changes column types. @xref{Silent column changes}. - -@cindex Oracle compatibility -@cindex compatibility, with Oracle -This statement is provided for Oracle compatibility. - -The @code{SHOW} statement provides similar information. -@xref{SHOW, , @code{SHOW}}. - - -@node Transactional Commands, Fulltext Search, Basic User Commands, Reference -@section MySQL Transactional and Locking Commands - -@menu -* COMMIT:: @code{BEGIN/COMMIT/ROLLBACK} Syntax -* LOCK TABLES:: @code{LOCK TABLES/UNLOCK TABLES} Syntax -* SET TRANSACTION:: @code{SET TRANSACTION} Syntax -@end menu - - -@node COMMIT, LOCK TABLES, Transactional Commands, Transactional Commands -@subsection @code{BEGIN/COMMIT/ROLLBACK} Syntax - -@findex BEGIN -@findex COMMIT -@findex ROLLBACK - -By default, MySQL runs in @code{autocommit} mode. This means that -as soon as you execute an update, MySQL will store the update on -disk. - -If you are using transactions safe tables (like @code{InnoDB}, -@code{BDB}, you can put MySQL into -non-@code{autocommit} mode with the following command: - -@example -SET AUTOCOMMIT=0 -@end example - -After this you must use @code{COMMIT} to store your changes to disk or -@code{ROLLBACK} if you want to ignore the changes you have made since -the beginning of your transaction. - -If you want to switch from @code{AUTOCOMMIT} mode for one series of -statements, you can use the @code{BEGIN} or @code{BEGIN WORK} statement: - -@example -BEGIN; -SELECT @@A:=SUM(salary) FROM table1 WHERE type=1; -UPDATE table2 SET summmary=@@A WHERE type=1; -COMMIT; -@end example - -Note that if you are using non-transaction-safe tables, the changes will be -stored at once, independent of the status of the @code{autocommit} mode. - -If you do a @code{ROLLBACK} when you have updated a non-transactional -table you will get an error (@code{ER_WARNING_NOT_COMPLETE_ROLLBACK}) as -a warning. All transactional safe tables will be restored but any -non-transactional table will not change. - -If you are using @code{BEGIN} or @code{SET AUTOCOMMIT=0}, you -should use the MySQL binary log for backups instead of the -older update log. Transactions are stored in the binary log -in one chunk, upon @code{COMMIT}, to ensure that transactions which are -rolled back are not stored. @xref{Binary log}. - -The following commands automatically end a transaction (as if you had done -a @code{COMMIT} before executing the command): - -@multitable @columnfractions .25 .25 .25 -@item @strong{Command} @tab @strong{Command} @tab @strong{Command} -@item @code{ALTER TABLE} @tab @code{BEGIN} @tab @code{CREATE INDEX} -@item @code{DROP DATABASE} @tab @code{DROP TABLE} @tab @code{RENAME TABLE} -@item @code{TRUNCATE} @tab @tab -@end multitable - -You can change the isolation level for transactions with -@code{SET TRANSACTION ISOLATION LEVEL ...}. @xref{SET TRANSACTION}. - - -@node LOCK TABLES, SET TRANSACTION, COMMIT, Transactional Commands -@subsection @code{LOCK TABLES/UNLOCK TABLES} Syntax - -@findex LOCK TABLES -@findex UNLOCK TABLES - -@example -LOCK TABLES tbl_name [AS alias] @{READ | [READ LOCAL] | [LOW_PRIORITY] WRITE@} - [, tbl_name @{READ | [LOW_PRIORITY] WRITE@} ...] -... -UNLOCK TABLES -@end example - -@code{LOCK TABLES} locks tables for the current thread. @code{UNLOCK -TABLES} releases any locks held by the current thread. All tables that -are locked by the current thread are automatically unlocked when the -thread issues another @code{LOCK TABLES}, or when the connection to the -server is closed. - -To use @code{LOCK TABLES} in MySQL 4.0.2 you need the global -@code{LOCK TABLES} privilege and a @code{SELECT} privilege on the -involved tables. In MySQL 3.23 you need to have @code{SELECT}, -@code{insert}, @code{DELETE} and @code{UPDATE} privileges for the -tables. - -The main reasons to use @code{LOCK TABLES} are for emulating transactions -or getting more speed when updating tables. This is explained in more -detail later. - -If a thread obtains a @code{READ} lock on a table, that thread (and all other -threads) can only read from the table. If a thread obtains a @code{WRITE} -lock on a table, then only the thread holding the lock can @code{READ} from -or @code{WRITE} to the table. Other threads are blocked. - -The difference between @code{READ LOCAL} and @code{READ} is that -@code{READ LOCAL} allows non-conflicting @code{INSERT} statements to -execute while the lock is held. This can't however be used if you are -going to manipulate the database files outside MySQL while you -hold the lock. - -When you use @code{LOCK TABLES}, you must lock all tables that you are -going to use and you must use the same alias that you are going to use -in your queries! If you are using a table multiple times in a query -(with aliases), you must get a lock for each alias! - -@code{WRITE} locks normally have higher priority than @code{READ} locks, to -ensure that updates are processed as soon as possible. This means that if one -thread obtains a @code{READ} lock and then another thread requests a -@code{WRITE} lock, subsequent @code{READ} lock requests will wait until the -@code{WRITE} thread has gotten the lock and released it. You can use -@code{LOW_PRIORITY WRITE} locks to allow other threads to obtain @code{READ} -locks while the thread is waiting for the @code{WRITE} lock. You should only -use @code{LOW_PRIORITY WRITE} locks if you are sure that there will -eventually be a time when no threads will have a @code{READ} lock. - -@code{LOCK TABLES} works as follows: -@enumerate -@item -Sort all tables to be locked in a internally defined order (from the -user standpoint the order is undefined). -@item -If a table is locked with a read and a write lock, put the write lock -before the read lock. -@item -Lock one table at a time until the thread gets all locks. -@end enumerate - -This policy ensures that table locking is deadlock free. There is -however other things one needs to be aware of with this schema: - -If you are using a @code{LOW_PRIORITY WRITE} lock for a table, this -means only that MySQL will wait for this particlar lock until -there is no threads that wants a @code{READ} lock. When the thread has -got the @code{WRITE} lock and is waiting to get the lock for the next -table in the lock table list, all other threads will wait for the -@code{WRITE} lock to be released. If this becomes a serious problem -with your application, you should consider converting some of your -tables to transactions safe tables. - -You can safely kill a thread that is waiting for a table lock with -@code{KILL}. @xref{KILL}. - -Note that you should @strong{not} lock any tables that you are using with -@code{INSERT DELAYED}. This is because that in this case the @code{INSERT} -is done by a separate thread. - -Normally, you don't have to lock tables, as all single @code{UPDATE} statements -are atomic; no other thread can interfere with any other currently executing -SQL statement. There are a few cases when you would like to lock tables -anyway: - -@itemize @bullet -@item -If you are going to run many operations on a bunch of tables, it's much -faster to lock the tables you are going to use. The downside is, of course, -that no other thread can update a @code{READ}-locked table and no other -thread can read a @code{WRITE}-locked table. - -The reason some things are faster under @code{LOCK TABLES} is that -MySQL will not flush the key cache for the locked tables until -@code{UNLOCK TABLES} is called (normally the key cache is flushed after -each SQL statement). This speeds up inserting/updateing/deletes on -@code{MyISAM} tables. -@item -If you are using a table handler in MySQL that doesn't support -transactions, you must use @code{LOCK TABLES} if you want to ensure that -no other thread comes between a @code{SELECT} and an @code{UPDATE}. The -example shown here requires @code{LOCK TABLES} in order to execute safely: - -@example -mysql> LOCK TABLES trans READ, customer WRITE; -mysql> SELECT SUM(value) FROM trans WHERE customer_id=some_id; -mysql> UPDATE customer SET total_value=sum_from_previous_statement - -> WHERE customer_id=some_id; -mysql> UNLOCK TABLES; -@end example - -Without @code{LOCK TABLES}, there is a chance that another thread might -insert a new row in the @code{trans} table between execution of the -@code{SELECT} and @code{UPDATE} statements. -@end itemize - -By using incremental updates (@code{UPDATE customer SET -value=value+new_value}) or the @code{LAST_INSERT_ID()} function, you can -avoid using @code{LOCK TABLES} in many cases. - -You can also solve some cases by using the user-level lock functions -@code{GET_LOCK()} and @code{RELEASE_LOCK()}. These locks are saved in a hash -table in the server and implemented with @code{pthread_mutex_lock()} and -@code{pthread_mutex_unlock()} for high speed. -@xref{Miscellaneous functions}. - -See @ref{Internal locking}, for more information on locking policy. - -You can lock all tables in all databases with read locks with the -@code{FLUSH TABLES WITH READ LOCK} command. @xref{FLUSH}. This is very -convenient way to get backups if you have a filesystem, like Veritas, -that can take snapshots in time. - -@strong{NOTE}: @code{LOCK TABLES} is not transaction-safe and will -automatically commit any active transactions before attempting to lock the -tables. - - -@node SET TRANSACTION, , LOCK TABLES, Transactional Commands -@subsection @code{SET TRANSACTION} Syntax - -@findex SET TRANSACTION -@findex ISOLATION LEVEL - -@example -SET [GLOBAL | SESSION] TRANSACTION ISOLATION LEVEL -@{ READ UNCOMMITTED | READ COMMITTED | REPEATABLE READ | SERIALIZABLE @} -@end example - -Sets the transaction isolation level for the global, whole session or -the next transaction. - -The default behaviour is to set the isolation level for the next (not -started) transaction. If you use the @code{GLOBAL} keyword, the statement -sets the default transaction level globally for all new connections -created from that point on. You will need the @code{SUPER} -privilege to do do this. Using the @code{SESSION} keyword sets the -default transaction level for all future transactions performed on the -current connection. - -You can set the default global isolation level for @code{mysqld} with -@code{--transaction-isolation=...}. @xref{Command-line options}. - -@node Fulltext Search, Query Cache, Transactional Commands, Reference -@section MySQL Full-text Search - -@cindex searching, full-text -@cindex full-text search -@cindex FULLTEXT - -As of Version 3.23.23, MySQL has support for full-text indexing -and searching. Full-text indexes in MySQL are an index of type -@code{FULLTEXT}. @code{FULLTEXT} indexes are used with MyISAM tables -and can be created from @code{VARCHAR} -and @code{TEXT} columns at @code{CREATE TABLE} time or added later with -@code{ALTER TABLE} or @code{CREATE INDEX}. For large datasets, it will be -much faster to load your data into a table that has no @code{FULLTEXT} -index, then create the index with @code{ALTER TABLE} (or @code{CREATE -INDEX}). Loading data into a table that already has a @code{FULLTEXT} -index will be slower. - -Full-text searching is performed with the @code{MATCH()} function. - -@example -mysql> CREATE TABLE articles ( - -> id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY, - -> title VARCHAR(200), - -> body TEXT, - -> FULLTEXT (title,body) - -> ); -Query OK, 0 rows affected (0.00 sec) - -mysql> INSERT INTO articles VALUES - -> (0,'MySQL Tutorial', 'DBMS stands for DataBase ...'), - -> (0,'How To Use MySQL Efficiently', 'After you went through a ...'), - -> (0,'Optimising MySQL','In this tutorial we will show ...'), - -> (0,'1001 MySQL Tricks','1. Never run mysqld as root. 2. ...'), - -> (0,'MySQL vs. YourSQL', 'In the following database comparison ...'), - -> (0,'MySQL Security', 'When configured properly, MySQL ...'); -Query OK, 6 rows affected (0.00 sec) -Records: 6 Duplicates: 0 Warnings: 0 - -mysql> SELECT * FROM articles - -> WHERE MATCH (title,body) AGAINST ('database'); -+----+-------------------+------------------------------------------+ -| id | title | body | -+----+-------------------+------------------------------------------+ -| 5 | MySQL vs. YourSQL | In the following database comparison ... | -| 1 | MySQL Tutorial | DBMS stands for DataBase ... | -+----+-------------------+------------------------------------------+ -2 rows in set (0.00 sec) -@end example - -The @code{MATCH()} function performs a natural language search for a string -against a text collection (a set of of one or more columns included in -a @code{FULLTEXT} index). The search string is given as the argument to -@code{AGAINST()}. The search is performed in case-insensitive fashion. -For every row in the table, @code{MATCH()} returns a relevance value, -that is, a similarity measure between the search string and the text in -that row in the columns named in the @code{MATCH()} list. - -When @code{MATCH()} is used in a @code{WHERE} clause (see example above) -the rows returned are automatically sorted with highest relevance first. -Relevance values are non-negative floating-point numbers. Zero relevance -means no similarity. Relevance is computed based on the number of words -in the row, the number of unique words in that row, the total number of -words in the collection, and the number of documents (rows) that contain -a particular word. - -It is also possible to perform a boolean mode search. This is explained -later in the section. - -The preceding example is a basic illustration showing how to use the -@code{MATCH()} function. Rows are returned in order of decreasing -relevance. - -The next example shows how to retrieve the relevance values explicitly. -As neither @code{WHERE} nor @code{ORDER BY} clauses are present, returned -rows are not ordered. - -@example -mysql> SELECT id,MATCH (title,body) AGAINST ('Tutorial') FROM articles; -+----+-----------------------------------------+ -| id | MATCH (title,body) AGAINST ('Tutorial') | -+----+-----------------------------------------+ -| 1 | 0.64840710366884 | -| 2 | 0 | -| 3 | 0.66266459031789 | -| 4 | 0 | -| 5 | 0 | -| 6 | 0 | -+----+-----------------------------------------+ -6 rows in set (0.00 sec) -@end example - -The following example is more complex. The query returns the relevance -and still sorts the rows in order of decreasing relevance. To achieve -this result, you should specify @code{MATCH()} twice. This will cause no -additional overhead, because the MySQL optimiser will notice that the -two @code{MATCH()} calls are identical and invoke the full-text search -code only once. - -@example -mysql> SELECT id, body, MATCH (title,body) AGAINST - -> ('Security implications of running MySQL as root') AS score - -> FROM articles WHERE MATCH (title,body) AGAINST - -> ('Security implications of running MySQL as root'); -+----+-------------------------------------+-----------------+ -| id | body | score | -+----+-------------------------------------+-----------------+ -| 4 | 1. Never run mysqld as root. 2. ... | 1.5055546709332 | -| 6 | When configured properly, MySQL ... | 1.31140957288 | -+----+-------------------------------------+-----------------+ -2 rows in set (0.00 sec) -@end example - -MySQL uses a very simple parser to split text into words. A ``word'' -is any sequence of characters consisting of letters, numbers, @samp{'}, -and @samp{_}. Any ``word'' that is present in the stopword list or is just -too short (3 characters or less) is ignored. - -Every correct word in the collection and in the query is weighted -according to its significance in the query or collection. This way, a -word that is present in many documents will have lower weight (and may -even have a zero weight), because it has lower semantic value in this -particular collection. Otherwise, if the word is rare, it will receive a -higher weight. The weights of the words are then combined to compute the -relevance of the row. - -Such a technique works best with large collections (in fact, it was -carefully tuned this way). For very small tables, word distribution -does not reflect adequately their semantic value, and this model -may sometimes produce bizarre results. - -@example -mysql> SELECT * FROM articles WHERE MATCH (title,body) AGAINST ('MySQL'); -Empty set (0.00 sec) -@end example - -The search for the word @code{MySQL} produces no results in the above -example, because that word is present in more than half the rows. As such, -it is effectively treated as a stopword (that is, a word with zero semantic -value). This is the most desirable behaviour -- a natural language query -should not return every second row from a 1GB table. - -A word that matches half of rows in a table is less likely to locate relevant -documents. In fact, it will most likely find plenty of irrelevant documents. -We all know this happens far too often when we are trying to find something on -the Internet with a search engine. It is with this reasoning that such rows -have been assigned a low semantic value in @strong{this particular dataset}. - -As of Version 4.0.1, MySQL can also perform boolean full-text searches using -the @code{IN BOOLEAN MODE} modifier. - -@example -mysql> SELECT * FROM articles WHERE MATCH (title,body) - -> AGAINST ('+MySQL -YourSQL' IN BOOLEAN MODE); -+----+------------------------------+-------------------------------------+ -| id | title | body | -+----+------------------------------+-------------------------------------+ -| 1 | MySQL Tutorial | DBMS stands for DataBase ... | -| 2 | How To Use MySQL Efficiently | After you went through a ... | -| 3 | Optimising MySQL | In this tutorial we will show ... | -| 4 | 1001 MySQL Tricks | 1. Never run mysqld as root. 2. ... | -| 6 | MySQL Security | When configured properly, MySQL ... | -+----+------------------------------+-------------------------------------+ -@end example - -This query retrieved all the rows that contain the word @code{MySQL} -(note: the 50% threshold is not used), but that do @strong{not} contain -the word @code{YourSQL}. Note that a boolean mode search does not -auto-magically sort rows in order of decreasing relevance. You can -see this from result of the preceding query, where the row with the -highest relevance (the one that contains @code{MySQL} twice) is listed -last, not first. A boolean full-text search can also work even without -a @code{FULLTEXT} index, although it would be @strong{slow}. - -The boolean full-text search capability supports the following operators: - -@table @code -@item + -A leading plus sign indicates that this word @strong{must be} -present in every row returned. -@item - -A leading minus sign indicates that this word @strong{must not be} -present in any row returned. -@item -By default (when neither plus nor minus is specified) the word is optional, -but the rows that contain it will be rated higher. This mimicks the -behaviour of @code{MATCH() ... AGAINST()} without the @code{IN BOOLEAN -MODE} modifier. -@item < > -These two operators are used to change a word's contribution to the -relevance value that is assigned to a row. The @code{<} operator -decreases the contribution and the @code{>} operator increases it. -See the example below. -@item ( ) -Parentheses are used to group words into subexpressions. -@item ~ -A leading tilde acts as a negation operator, causing the word's -contribution to the row relevance to be negative. It's useful for marking -noise words. A row that contains such a word will be rated lower than -others, but will not be excluded altogether, as it would be with the -@code{-} operator. -@item * -An asterisk is the truncation operator. Unlike the other operators, it -should be @strong{appended} to the word, not prepended. -@item " -The phrase, that is enclosed in double quotes @code{"}, matches only -rows that contain this phrase @strong{literally, as it was typed}. -@end table - -And here are some examples: - -@table @code -@item apple banana -find rows that contain at least one of these words. -@item +apple +juice -... both words. -@item +apple macintosh -... word ``apple'', but rank it higher if it also contain ``macintosh''. -@item +apple -macintosh -... word ``apple'' but not ``macintosh''. -@item +apple +(>pie <strudel) -... ``apple'' and ``pie'', or ``apple'' and ``strudel'' (in any -order), but rank ``apple pie'' higher than ``apple strudel''. -@item apple* -... ``apple'', ``apples'', ``applesauce'', and ``applet''. -@item "some words" -... ``some words of wisdom'', but not ``some noise words''. -@end table - -@menu -* Fulltext Restrictions:: Full-text Restrictions -* Fulltext Fine-tuning:: Fine-tuning MySQL Full-text Search -* Fulltext TODO:: Full-text Search TODO -@end menu - -@node Fulltext Restrictions, Fulltext Fine-tuning, Fulltext Search, Fulltext Search -@subsection Full-text Restrictions - -@itemize @bullet -@item -All parameters to the @code{MATCH()} function must be columns from the -same table that is part of the same @code{FULLTEXT} index, unless the -@code{MATCH()} is @code{IN BOOLEAN MODE}. -@item -The @code{MATCH()} column list must exactly match the column list in some -@code{FULLTEXT} index definition for the table, unless this @code{MATCH()} -is @code{IN BOOLEAN MODE}. -@item -The argument to @code{AGAINST()} must be a constant string. -@end itemize - - -@node Fulltext Fine-tuning, Fulltext TODO, Fulltext Restrictions, Fulltext Search -@subsection Fine-tuning MySQL Full-text Search - -Unfortunately, full-text search has few user-tunable parameters yet, -although adding some is very high on the TODO. If you have a -MySQL source distribution (@pxref{Installing source}), you can -exert more control over full-text searching behaviour. - -Note that full-text search was carefully tuned for the best searching -effectiveness. Modifying the default behaviour will, in most cases, -only make the search results worse. Do not alter the MySQL sources -unless you know what you are doing! - -@itemize @bullet - -@item -The minimum length of words to be indexed is defined by the MySQL -variable @code{ft_min_word_len}. @xref{SHOW VARIABLES}. -Change it to the value you prefer, and rebuild your @code{FULLTEXT} indexes. -(This variable is only available from MySQL version 4.0.) - -@item -The stopword list is defined in @file{myisam/ft_static.c} -Modify it to your taste, recompile MySQL, and rebuild -your @code{FULLTEXT} indexes. - -@item -The 50% threshold is determined by the particular weighting scheme chosen. -To disable it, change the following line in @file{myisam/ftdefs.h}: -@example -#define GWS_IN_USE GWS_PROB -@end example -To: -@example -#define GWS_IN_USE GWS_FREQ -@end example -Then recompile MySQL. -There is no need to rebuild the indexes in this case. -@strong{Note}: by doing this you @strong{severely} decrease MySQL's ability -to provide adequate relevance values for the @code{MATCH()} function. -If you really need to search for such common words, it would be better to -search using @code{IN BOOLEAN MODE} instead, which does not observe the 50% -threshold. - -@item -Sometimes the search engine maintainer would like to change the operators used -for boolean full-text searches. These are defined by the -@code{ft_boolean_syntax} variable. @xref{SHOW VARIABLES}. -Still, this variable is read-only, its value is set in -@file{myisam/ft_static.c}. - -@end itemize - -@node Fulltext TODO, , Fulltext Fine-tuning, Fulltext Search -@subsection Full-text Search TODO - -@itemize @bullet -@item Make all operations with @code{FULLTEXT} index @strong{faster}. -@item Proximity operators -@item Support for "always-index words". They could be any strings -the user wants to treat as words, examples are "C++", "AS/400", "TCP/IP", etc. -@item Support for full-text search in @code{MERGE} tables. -@item Support for multi-byte charsets. -@item Make stopword list to depend of the language of the data. -@item Stemming (dependent of the language of the data, of course). -@item Generic user-suppliable UDF preparser. -@item Make the model more flexible (by adding some adjustable -parameters to @code{FULLTEXT} in @code{CREATE/ALTER TABLE}). -@end itemize - - -@node Query Cache, , Fulltext Search, Reference -@section MySQL Query Cache - -@cindex Query Cache -@cindex @code{SELECT}, Query Cache - -From version 4.0.1, @code{MySQL server} features a @code{Query Cache}. -When in use, the query cache stores the text of a @code{SELECT} query -together with the corresponding result that was sent to the client. -If an identical query is later received, the server will retrieve -the results from the query cache rather than parsing and executing the -same query again. - -@strong{NOTE:} The query cache does not return stale data. When data -is modified, any relevant entries in the query cache are flushed. - -The query cache is extremely useful in an environment where (some) -tables don't change very often and you have a lot of identical queries. -This is a typical situation for many web servers that use a lot of -dynamic content. - -Below is some performance data for the query cache. (These results were -generated by running the MySQL benchmark suite on a Linux Alpha -2 x 500 MHz with 2GB RAM and a 64MB query cache): - -@itemize @bullet -@item -If all of the queries you're performing are simple (such as selecting a -row from a table with one row); but still differ so that the queries can -not be cached, the overhead for having the query cache active is 13%. -This could be regarded as the worst case scenario. However, in real life, -queries are much more complicated than our simple example so the overhead -is normally significantly lower. -@item -Searches after one row in a one row table is 238% faster. -This can be regarded as close to the minimum speedup to be expected for -a query that is cached. -@item -If you want to disable the query cache code set @code{query_cache_size=0}. -By disabling the query cache code there is no noticeable overhead. -(query cache can be excluded from code with help of configure option -@code{--without-query-cache}) -@end itemize - -@menu -* Query Cache How:: How The Query Cache Operates -* Query Cache Configuration:: Query Cache Configuration -* Query Cache in SELECT:: Query Cache Options in @code{SELECT} -* Query Cache Status and Maintenance:: Query Cache Status and Maintenance -@end menu - - -@node Query Cache How, Query Cache Configuration, Query Cache, Query Cache -@subsection How The Query Cache Operates - -Queries are compared before parsing, thus - -@example -SELECT * FROM TABLE -@end example - -and - -@example -Select * from table -@end example - -are regarded as different queries for query cache, so queries need -to be exactly the same (byte for byte) to be seen as identical. -In addition, a query may be seen as different if for instance one -client is using a new communication protocol format or another -character set than another client. - -Queries that uses different databases, uses different protocol versions -or the uses different default character sets are considered different -queries and cached separately. - -The cache does work for @code{SELECT CALC_ROWS ...} and -@code{SELECT FOUND_ROWS() ...} type queries because the number of -found rows is also stored in the cache. - -If a table changes (@code{INSERT}, @code{UPDATE}, @code{DELETE}, -@code{TRUNCATE}, @code{ALTER} or @code{DROP TABLE|DATABASE}), -then all cached queries that used this table (possibly through a -@code{MRG_MyISAM} table!) become invalid and are removed from the cache. - -Transactional @code{InnoDB} tables that have been changed will be invalidated -when a @code{COMMIT} is performed. - -A query cannot be cached if it contains one of the functions: -@multitable @columnfractions .33 .33 .34 -@item @strong{Function} - @tab @strong{Function} - @tab @strong{Function} -@item @code{User-Defined Functions} - @tab @code{CONNECTION_ID} - @tab @code{FOUND_ROWS} -@item @code{GET_LOCK} - @tab @code{RELEASE_LOCK} - @tab @code{LOAD_FILE} -@item @code{MASTER_POS_WAIT} - @tab @code{NOW} - @tab @code{SYSDATE} -@item @code{CURRENT_TIMESTAMP} - @tab @code{CURDATE} - @tab @code{CURRENT_DATE} -@item @code{CURTIME} - @tab @code{CURRENT_TIME} - @tab @code{DATABASE} -@item @code{ENCRYPT} (with one parameter) - @tab @code{LAST_INSERT_ID} - @tab @code{RAND} -@item @code{UNIX_TIMESTAMP} (without parameters) - @tab @code{USER} - @tab @code{BENCHMARK} -@end multitable - -Nor can a query be cached if it contains user variables, -if it is of the form @code{SELECT ... IN SHARE MODE} or -of the form @code{SELECT * FROM AUTOINCREMENT_FIELD IS NULL} -(to retrieve last insert id - ODBC work around). - -However, @code{FOUND ROWS()} will return the correct value, -even if the preceding query was fetched from the cache. - -In case a query does not use any tables, or uses temporary tables, -or if the user has a column privilege for any of the involved tables, -that query will not be cached. - -Before a query is fetched from the query cache, MySQL will check that -the user has SELECT privilege to all the involved databases and -tables. If this is not the case, the cached result will not be used. - -@node Query Cache Configuration, Query Cache in SELECT, Query Cache How, Query Cache -@subsection Query Cache Configuration - -The query cache adds a few @code{MySQL} system variables for -@code{mysqld} which may be set in a configuration file, on the -command-line when starting @code{mysqld}. - -@itemize -@item @code{query_cache_limit} -Don't cache results that are bigger than this. (Default 1M). - -@item @code{query_cache_size} -The memory allocated to store results from old queries. -If this is 0, the query cache is disabled (default). - -@item @code{query_cache_type} -This may be set (only numeric) to -@multitable @columnfractions .10 .75 -@item @strong{Option} @tab @strong{Description} -@item 0 @tab (OFF, don't cache or retrieve results) -@item 1 @tab (ON, cache all results except @code{SELECT SQL_NO_CACHE ...} queries) -@item 2 @tab (DEMAND, cache only @code{SELECT SQL_CACHE ...} queries) -@end multitable -@end itemize - -Inside a thread (connection), the behaviour of the query cache can be -changed from the default. The syntax is as follows: - -@code{QUERY_CACHE_TYPE = OFF | ON | DEMAND} -@code{QUERY_CACHE_TYPE = 0 | 1 | 2} - -@multitable @columnfractions .20 .70 -@item @strong{Option} @tab @strong{Description} -@item 0 or OFF @tab Don't cache or retrieve results. -@item 1 or ON @tab Cache all results except @code{SELECT SQL_NO_CACHE ...} queries. -@item 2 or DEMAND @tab Cache only @code{SELECT SQL_CACHE ...} queries. -@end multitable - - -@node Query Cache in SELECT, Query Cache Status and Maintenance, Query Cache Configuration, Query Cache -@subsection Query Cache Options in @code{SELECT} - -There are two possible query cache related parameters that may be -specified in a @code{SELECT} query: - -@findex SQL_CACHE -@findex SQL_NO_CACHE - -@multitable @columnfractions .20 .80 -@item @strong{Option} @tab @strong{Description} -@item @code{SQL_CACHE} - @tab If @code{QUERY_CACHE_TYPE} is @code{DEMAND}, allow the query to be cached. - If @code{QUERY_CACHE_TYPE} is @code{ON}, this is the default. - If @code{QUERY_CACHE_TYPE} is @code{OFF}, do nothing. -@item @code{SQL_NO_CACHE} - @tab Make this query non-cachable, don't allow this query to be stored in the cache. -@end multitable - - -@node Query Cache Status and Maintenance, , Query Cache in SELECT, Query Cache -@subsection Query Cache Status and Maintenance - -With the @code{FLUSH QUERY CACHE} command you can defragment the query -cache to better utilise its memory. This command will not remove any -queries from the cache. -@code{FLUSH TABLES} also flushes the query cache. - -The @code{RESET QUERY CACHE} command removes all query results from the -query cache. - -You can monitor query cache performance in @code{SHOW STATUS}: - -@multitable @columnfractions .30 .50 -@item @strong{Variable} @tab @strong{Description} -@item @code{Qcache_queries_in_cache} - @tab Number of queries registered in the cache. -@item @code{Qcache_inserts} - @tab Number of queries added to the cache. -@item @code{Qcache_hits} - @tab Number of cache hits. -@item @code{Qcache_not_cached} - @tab Number of non-cached queries - (not cachable, or due to @code{QUERY_CACHE_TYPE}). -@item @code{Qcache_free_memory} - @tab Amount of free memory for query cache. -@item @code{Qcache_total_blocks} - @tab Total number of blocks in query cache. -@item @code{Qcache_free_blocks} - @tab Number of free memory blocks in query cache. -@end multitable - -Total number of queries = -@code{Qcache_inserts} + @code{Qcache_hits} + @code{Qcache_not_cached}. - -The query cache uses variable length blocks, so @code{Qcache_total_blocks} -and @code{Qcache_free_blocks} may indicate query cache memory fragmentation. -After @code{FLUSH QUERY CACHE} only a single (big) free block remains. - -Note: Every query needs a minimum of two blocks (one for the query text -and one or more for the query results). Also, every table that is used -by a query needs one block, but if two or more queries use same table -only one block needs to be allocated. - - -@node Table types, Clients, Reference, Top -@chapter MySQL Table Types - -@cindex table types, choosing -@cindex @code{BDB} table type -@cindex @code{BerkeleyDB} table type -@cindex @code{HEAP} table type -@cindex @code{ISAM} table type -@cindex @code{InnoDB} table type -@cindex @code{MERGE} table type -@cindex MySQL table types -@cindex @code{MyISAM} table type -@cindex types, of tables - -As of MySQL Version 3.23.6, you can choose between three basic -table formats (@code{ISAM}, @code{HEAP} and @code{MyISAM}. Newer -MySQL may support additional table type (@code{InnoDB}, -or @code{BDB}), depending on how you compile it. - -When you create a new table, you can tell MySQL which table -type it should use for the table. MySQL will always create a -@file{.frm} file to hold the table and column definitions. Depending on -the table type, the index and data will be stored in other files. - -Note that to use @code{InnoDB} tables you have to use at least -the @code{innodb_data_file_path} startup option. @xref{InnoDB start}. - -The default table type in MySQL is @code{MyISAM}. If you are -trying to use a table type that is not compiled-in or activated, -MySQL will instead create a table of type @code{MyISAM}. This -is a very useful feature when you want to copy tables between different -SQL servers that supports different table types (like copying tables to -a slave that is optimised for speed by not having transactional tables). -This automatic table changing can however also be very confusing for new -MySQL users. We plan to fix this by introducing warnings in -MySQL 4.0 and giving a warning when a table type is automatically -changed. - -You can convert tables between different types with the @code{ALTER -TABLE} statement. @xref{ALTER TABLE, , @code{ALTER TABLE}}. - -Note that MySQL supports two different kinds of -tables: transaction-safe tables (@code{InnoDB} and @code{BDB}) -and not transaction-safe tables (@code{HEAP}, @code{ISAM}, -@code{MERGE}, and @code{MyISAM}). - -Advantages of transaction-safe tables (TST): - -@itemize @bullet -@item -Safer. Even if MySQL crashes or you get hardware problems, you -can get your data back, either by automatic recovery or from a backup -+ the transaction log. -@item -You can combine many statements and accept these all in one go with -the @code{COMMIT} command. -@item -You can execute @code{ROLLBACK} to ignore your changes (if you are not -running in auto-commit mode). -@item -If an update fails, all your changes will be restored. (With NTST tables all -changes that have taken place are permanent) -@end itemize - -Advantages of not transaction-safe tables (NTST): - -@itemize @bullet -@item -Much faster as there is no transaction overhead. -@item -Will use less disk space as there is no overhead of transactions. -@item -Will use less memory to do updates. -@end itemize - -You can combine TST and NTST tables in the same statements to get the best -of both worlds. - -@menu -* MyISAM:: @code{MyISAM} tables -* MERGE:: @code{MERGE} tables -* ISAM:: @code{ISAM} tables -* HEAP:: @code{HEAP} tables -* InnoDB:: @code{InnoDB} tables -* BDB:: @code{BDB} or @code{BerkeleyDB} tables -@end menu - - -@node MyISAM, MERGE, Table types, Table types -@section @code{MyISAM} Tables - -@code{MyISAM} is the default table type in MySQL Version 3.23. It's -based on the @code{ISAM} code and has a lot of useful extensions. - -The index is stored in a file with the @file{.MYI} (MYIndex) extension, -and the data is stored in a file with the @file{.MYD} (MYData) extension. -You can check/repair @code{MyISAM} tables with the @code{myisamchk} -utility. @xref{Crash recovery}. You can compress @code{MyISAM} tables with -@code{myisampack} to take up much less space. -@xref{myisampack, , @code{myisampack}}. - -The following is new in @code{MyISAM}: - -@itemize @bullet -@item -There is a flag in the @code{MyISAM} file that indicates whether -the table was closed correctly. If @code{mysqld} is started with -@code{--myisam-recover}, @code{MyISAM} tables will automatically be -checked and/or repaired on open if the table wasn't closed properly. -@item -You can @code{INSERT} new rows in a table that doesn't have free blocks -in the middle of the datafile, at the same time other threads are -reading from the table (concurrent insert). An free block can come from -an update of a dynamic length row with much data to a row with less data -or when deleting rows. When all free blocks are used up, all future -inserts will be concurrent again. -@item -Support for big files (63-bit) on filesystems/operating systems that -support big files. -@item -All data is stored with the low byte first. This makes the data machine -and OS independent. The only requirement is that the machine uses -two's-complement signed integers (as every machine for the last 20 years -has) and IEEE floating-point format (also totally dominant among -mainstream machines). The only area of machines that may not support -binary compatibility are embedded systems (because they sometimes have -peculiar processors). - -There is no big speed penalty in storing data low byte first; the bytes -in a table row is normally unaligned and it doesn't take that much more -power to read an unaligned byte in order than in reverse order. The -actual fetch-column-value code is also not time critical compared to -other code. -@item -All number keys are stored with high byte first to give better index -compression. -@item -Internal handling of one @code{AUTO_INCREMENT} column. @code{MyISAM} -will automatically update this on @code{INSERT/UPDATE}. The -@code{AUTO_INCREMENT} value can be reset with @code{myisamchk}. This -will make @code{AUTO_INCREMENT} columns faster (at least 10%) and old -numbers will not be reused as with the old @code{ISAM}. Note that when an -@code{AUTO_INCREMENT} is defined on the end of a multi-part-key the old -behaviour is still present. -@item -When inserted in sorted order (as when you are using an @code{AUTO_INCREMENT} -column) the key tree will be split so that the high node only contains one -key. This will improve the space utilisation in the key tree. -@item -@code{BLOB} and @code{TEXT} columns can be indexed. -@item -@code{NULL} values are allowed in indexed columns. This takes 0-1 -bytes/key. -@item -Maximum key length is 500 bytes by default (can be changed by -recompiling). In cases of keys longer than 250 bytes, a bigger key -block size than the default of 1024 bytes is used for this key. -@item -Maximum number of keys/table is 32 as default. This can be enlarged to 64 -without having to recompile @code{myisamchk}. -@item -@code{myisamchk} will mark tables as checked if one runs it with -@code{--update-state}. @code{myisamchk --fast} will only check those -tables that don't have this mark. -@item -@code{myisamchk -a} stores statistics for key parts (and not only for -whole keys as in @code{ISAM}). -@item -Dynamic size rows will now be much less fragmented when mixing deletes -with updates and inserts. This is done by automatically combining adjacent -deleted blocks and by extending blocks if the next block is deleted. -@item -@code{myisampack} can pack @code{BLOB} and @code{VARCHAR} columns. -@item -You can use put the datafile and index file on different directories -to get more speed (with the @code{DATA/INDEX DIRECTORY="path"} option to -@code{CREATE TABLE}). @xref{CREATE TABLE}. -@end itemize - -@code{MyISAM} also supports the following things, which MySQL -will be able to use in the near future: - -@itemize @bullet -@item -Support for a true @code{VARCHAR} type; a @code{VARCHAR} column starts -with a length stored in 2 bytes. -@item -Tables with @code{VARCHAR} may have fixed or dynamic record length. -@item -@code{VARCHAR} and @code{CHAR} may be up to 64K. -All key segments have their own language definition. This will enable -MySQL to have different language definitions per column. -@item -A hashed computed index can be used for @code{UNIQUE}. This will allow -you to have @code{UNIQUE} on any combination of columns in a table. (You -can't search on a @code{UNIQUE} computed index, however.) -@end itemize - -Note that index files are usually much smaller with @code{MyISAM} than with -@code{ISAM}. This means that @code{MyISAM} will normally use less -system resources than @code{ISAM}, but will need more CPU time when inserting -data into a compressed index. - -The following options to @code{mysqld} can be used to change the behaviour of -@code{MyISAM} tables. @xref{SHOW VARIABLES}. - -@multitable @columnfractions .40 .60 -@item @strong{Option} @tab @strong{Description} -@item @code{--myisam-recover=#} @tab Automatic recovery of crashed tables. -@item @code{-O myisam_sort_buffer_size=#} @tab Buffer used when recovering tables. -@item @code{--delay-key-write=ALL} @tab Don't flush key buffers between writes for any MyISAM table -@item @code{-O myisam_max_extra_sort_file_size=#} @tab Used to help MySQL to decide when to use the slow but safe key cache index create method. @strong{Note} that this parameter is given in megabytes before 4.0.3 and in bytes starting from this version. -@item @code{-O myisam_max_sort_file_size=#} @tab Don't use the fast sort index method to created index if the temporary file would get bigger than this. @strong{Note} that this parameter is given in megabytes before 4.0.3 and in bytes starting from this version. -@item @code{-O bulk_insert_buffer_size=#} @tab Size of tree cache used in bulk insert optimisation. @strong{Note} that this is a limit @strong{per thread}! -@end multitable - -The automatic recovery is activated if you start @code{mysqld} with -@code{--myisam-recover=#}. @xref{Command-line options}. -On open, the table is checked if it's marked as crashed or if the open -count variable for the table is not 0 and you are running with -@code{--skip-external-locking}. If either of the above is true the following -happens. - -@itemize @bullet -@item -The table is checked for errors. -@item -If we found an error, try to do a fast repair (with sorting and without -re-creating the datafile) of the table. -@item -If the repair fails because of an error in the datafile (for example a -duplicate key error), we try again, but this time we re-create the datafile. -@item -If the repair fails, retry once more with the old repair option method -(write row by row without sorting) which should be able to repair any -type of error with little disk requirements.. -@end itemize - -If the recover wouldn't be able to recover all rows from a previous -completed statement and you didn't specify @code{FORCE} as an option to -@code{myisam-recover}, then the automatic repair will abort with an error -message in the error file: - -@example -Error: Couldn't repair table: test.g00pages -@end example - -If you in this case had used the @code{FORCE} option you would instead have got -a warning in the error file: - -@example -Warning: Found 344 of 354 rows when repairing ./test/g00pages -@end example - -Note that if you run automatic recover with the @code{BACKUP} option, -you should have a @code{cron} script that automatically moves file with names -like @file{tablename-datetime.BAK} from the database directories to a -backup media. - -@xref{Command-line options}. - -@menu -* Key space:: Space needed for keys -* MyISAM table formats:: @code{MyISAM} Table Formats -* MyISAM table problems:: @code{MyISAM} Table Problems -@end menu - - -@node Key space, MyISAM table formats, MyISAM, MyISAM -@subsection Space Needed for Keys - -@cindex key space, MyISAM - -MySQL can support different index types, but the normal type is -ISAM or MyISAM. These use a B-tree index, and you can roughly calculate -the size for the index file as @code{(key_length+4)/0.67}, summed over -all keys. (This is for the worst case when all keys are inserted in -sorted order and we don't have any compressed keys.) - -String indexes are space compressed. If the first index part is a -string, it will also be prefix compressed. Space compression makes the -index file smaller than the above figures if the string column has a lot -of trailing space or is a @code{VARCHAR} column that is not always used -to the full length. Prefix compression is used on keys that start -with a string. Prefix compression helps if there are many strings -with an identical prefix. - -In @code{MyISAM} tables, you can also prefix compress numbers by specifying -@code{PACK_KEYS=1} when you create the table. This helps when you have -many integer keys that have an identical prefix when the numbers are stored -high-byte first. - - -@node MyISAM table formats, MyISAM table problems, Key space, MyISAM -@subsection @code{MyISAM} Table Formats - -@code{MyISAM} supports 3 different table types. Two of them are chosen -automatically depending on the type of columns you are using. The third, -compressed tables, can only be created with the @code{myisampack} tool. - -When you @code{CREATE} or @code{ALTER} a table you can for tables that -doesn't have @code{BLOB}s force the table format to @code{DYNAMIC} or -@code{FIXED} with the @code{ROW_FORMAT=#} table option. In the future -you will be able to compress/decompress tables by specifying -@code{ROW_FORMAT=compressed | default} to @code{ALTER TABLE}. -@xref{CREATE TABLE}. - -@menu -* Static format:: Static (Fixed-length) table characteristics -* Dynamic format:: Dynamic table characteristics -* Compressed format:: Compressed table characteristics -@end menu - - -@node Static format, Dynamic format, MyISAM table formats, MyISAM table formats -@subsubsection Static (Fixed-length) Table Characteristics - -This is the default format. It's used when the table contains no -@code{VARCHAR}, @code{BLOB}, or @code{TEXT} columns. - -This format is the simplest and most secure format. It is also the -fastest of the on-disk formats. The speed comes from the easy way data -can be found on disk. When looking up something with an index and static -format it is very simple. Just multiply the row number by the row length. - -Also, when scanning a table it is very easy to read a constant number of -records with each disk read. - -The security is evidenced if your computer crashes when writing to a -fixed-size MyISAM file, in which case @code{myisamchk} can easily figure out where each -row starts and ends. So it can usually reclaim all records except the -partially written one. Note that in MySQL all indexes can always be -reconstructed: - -@itemize @bullet -@item -All @code{CHAR}, @code{NUMERIC}, and @code{DECIMAL} columns are space-padded -to the column width. -@item -Very quick. -@item -Easy to cache. -@item -Easy to reconstruct after a crash, because records are located in fixed -positions. -@item -Doesn't have to be reorganised (with @code{myisamchk}) unless a huge number of -records are deleted and you want to return free disk space to the operating -system. -@item -Usually requires more disk space than dynamic tables. -@end itemize - - -@node Dynamic format, Compressed format, Static format, MyISAM table formats -@subsubsection Dynamic Table Characteristics - -@cindex dynamic table characteristics -@cindex tables, dynamic - -This format is used if the table contains any @code{VARCHAR}, @code{BLOB}, -or @code{TEXT} columns or if the table was created with -@code{ROW_FORMAT=dynamic}. - -This format is a little more complex because each row has to have a header -that says how long it is. One record can also end up at more than one -location when it is made longer at an update. - -@cindex tables, defragment -You can use @code{OPTIMIZE table} or @code{myisamchk} to defragment a -table. If you have static data that you access/change a lot in the same -table as some @code{VARCHAR} or @code{BLOB} columns, it might be a good -idea to move the dynamic columns to other tables just to avoid -fragmentation: - -@itemize @bullet -@item -All string columns are dynamic (except those with a length less than 4). -@item -Each record is preceded by a bitmap indicating which columns are empty -(@code{''}) for string columns, or zero for numeric columns. (This isn't -the same as columns containing @code{NULL} values.) If a string column -has a length of zero after removal of trailing spaces, or a numeric -column has a value of zero, it is marked in the bit map and not saved to -disk. Non-empty strings are saved as a length byte plus the string -contents. -@item -Usually takes much less disk space than fixed-length tables. -@item -Each record uses only as much space as is required. If a record becomes -larger, it is split into as many pieces as are required. This results in record -fragmentation. -@item -If you update a row with information that extends the row length, the -row will be fragmented. In this case, you may have to run @code{myisamchk --r} from time to time to get better performance. Use @code{myisamchk -ei -tbl_name} for some statistics. -@item -Not as easy to reconstruct after a crash, because a record may be fragmented -into many pieces and a link (fragment) may be missing. -@item -The expected row length for dynamic sized records is: - -@example -3 -+ (number of columns + 7) / 8 -+ (number of char columns) -+ packed size of numeric columns -+ length of strings -+ (number of NULL columns + 7) / 8 -@end example - -There is a penalty of 6 bytes for each link. A dynamic record is linked -whenever an update causes an enlargement of the record. Each new link will be -at least 20 bytes, so the next enlargement will probably go in the same link. -If not, there will be another link. You may check how many links there are -with @code{myisamchk -ed}. All links may be removed with @code{myisamchk -r}. -@end itemize - - -@node Compressed format, , Dynamic format, MyISAM table formats -@subsubsection Compressed Table Characteristics - -@cindex tables, compressed format - -This is a read-only type that is generated with the optional -@code{myisampack} tool (@code{pack_isam} for @code{ISAM} tables): - -@itemize @bullet -@item -All MySQL distributions, even those that existed before MySQL -went GPL, can read tables that were compressed with @code{myisampack}. -@item -Compressed tables take very little disk space. This minimises disk usage, which -is very nice when using slow disks (like CD-ROMs). -@item -Each record is compressed separately (very little access overhead). The -header for a record is fixed (1-3 bytes) depending on the biggest record in the -table. Each column is compressed differently. Some of the compression types -are: -@itemize @minus -@item -There is usually a different Huffman table for each column. -@item -Suffix space compression. -@item -Prefix space compression. -@item -Numbers with value @code{0} are stored using 1 bit. -@item -If values in an integer column have a small range, the column is stored using -the smallest possible type. For example, a @code{BIGINT} column (8 bytes) may -be stored as a @code{TINYINT} column (1 byte) if all values are in the range -@code{0} to @code{255}. -@item -If a column has only a small set of possible values, the column type is -converted to @code{ENUM}. -@item -A column may use a combination of the above compressions. -@end itemize -@item -Can handle fixed- or dynamic-length records. -@item -Can be uncompressed with @code{myisamchk}. -@end itemize - - -@node MyISAM table problems, , MyISAM table formats, MyISAM -@subsection @code{MyISAM} Table Problems - -The file format that MySQL uses to store data has been extensively -tested, but there are always circumstances that may cause database tables -to become corrupted. - -@menu -* Corrupted MyISAM tables:: Corrupted @code{MyISAM} Tables -* MyISAM table close:: Clients is using or hasn't closed the table properly -@end menu - - -@node Corrupted MyISAM tables, MyISAM table close, MyISAM table problems, MyISAM table problems -@subsubsection Corrupted @code{MyISAM} Tables - -Even if the MyISAM table format is very reliable (all changes to a table -is written before the SQL statements returns) , you can still get -corrupted tables if some of the following things happens: - -@itemize @bullet -@item -The @code{mysqld} process being killed in the middle of a write. -@item -Unexpected shutdown of the computer (for example, if the computer is turned -off). -@item -A hardware error. -@item -You are using an external program (like myisamchk) on a live table. -@item -A software bug in the MySQL or MyISAM code. -@end itemize - -Typial typical symptoms for a corrupt table is: - -@itemize @bullet -@item -You get the error @code{Incorrect key file for table: '...'. Try to repair it} -while selecting data from the table. -@item -Queries doesn't find rows in the table or returns incomplete data. -@end itemize - -You can check if a table is ok with the command @code{CHECK -TABLE}. @xref{CHECK TABLE}. - -You can repair a corrupted table with @code{REPAIR TABLE}. @xref{REPAIR TABLE}. -You can also repair a table, when @code{mysqld} is not running with -the @code{myisamchk} command. @code{myisamchk syntax}. - -If your tables get corrupted a lot you should try to find the reason for -this! @xref{Crashing}. - -In this case the most important thing to know is if the table got -corrupted if the @code{mysqld} died (one can easily verify this by -checking if there is a recent row @code{restarted mysqld} in the mysqld -error file). If this isn't the case, then you should try to make a test -case of this. @xref{Reproduceable test case}. - - -@node MyISAM table close, , Corrupted MyISAM tables, MyISAM table problems -@subsubsection Clients is using or hasn't closed the table properly - -Each @code{MyISAM} @file{.MYI} file has in the header a counter that can -be used to check if a table has been closed properly. - -If you get the following warning from @code{CHECK TABLE} or @code{myisamchk}: - -@example -# clients is using or hasn't closed the table properly -@end example - -this means that this counter has come out of sync. This doesn't mean -that the table is corrupted, but means that you should at least do a -check on the table to verify that it's okay. - -The counter works as follows: - -@itemize @bullet -@item -The first time a table is updated in MySQL, a counter in the -header of the index files is incremented. -@item -The counter is not changed during further updates. -@item -When the last instance of a table is closed (because of a @code{FLUSH} or -because there isn't room in the table cache) the counter is -decremented if the table has been updated at any point. -@item -When you repair the table or check the table and it was okay, -the counter is reset to 0. -@item -To avoid problems with interaction with other processes that may do a -check on the table, the counter is not decremented on close if it was 0. -@end itemize - -In other words, the only ways this can go out of sync are: - -@itemize @bullet -@item -The @code{MyISAM} tables are copied without a @code{LOCK} and -@code{FLUSH TABLES}. -@item -MySQL has crashed between an update and the final close. -(Note that the table may still be okay, as MySQL always issues writes -for everything between each statement.) -@item -Someone has done a @code{myisamchk --repair} or @code{myisamchk ---update-state}on a table that was in use by @code{mysqld}. -@item -Many @code{mysqld} servers are using the table and one has done a -@code{REPAIR} or @code{CHECK} of the table while it was in use by -another server. In this setup the @code{CHECK} is safe to do (even if -you will get the warning from other servers), but @code{REPAIR} should -be avoided as it currently replaces the datafile with a new one, which -is not signaled to the other servers. -@end itemize - - -@node MERGE, ISAM, MyISAM, Table types -@section @code{MERGE} Tables - -@cindex tables, merging -@cindex MERGE tables, defined - -@code{MERGE} tables are new in MySQL Version 3.23.25. The code -is still in gamma, but should be resonable stable. - -A @code{MERGE} table (also known as a @code{MRG_MyISAM} table) is a -collection of identical @code{MyISAM} tables that can be used as one. -You can only @code{SELECT}, @code{DELETE}, and @code{UPDATE} from the -collection of tables. If you @code{DROP} the @code{MERGE} table, you -are only dropping the @code{MERGE} specification. - -Note that @code{DELETE FROM merge_table} used without a @code{WHERE} -will only clear the mapping for the table, not delete everything in the -mapped tables. (We plan to fix this in 4.1). - -With identical tables we mean that all tables are created with identical -column and key information. You can't merge tables in which the -columns are packed differently, doesn't have exactly the same columns, -or have the keys in different order. However, some of the tables can be -compressed with @code{myisampack}. @xref{myisampack, , @code{myisampack}}. - -When you create a @code{MERGE} table, you will get a @file{.frm} table -definition file and a @file{.MRG} table list file. The @file{.MRG} just -contains a list of the index files (@file{.MYI} files) that should -be used as one. All used tables must be in the same database as the -@code{MERGE} table itself. - -For the moment, you need to have @code{SELECT}, @code{UPDATE}, and -@code{DELETE} privileges on the tables you map to a @code{MERGE} table. - -@code{MERGE} tables can help you solve the following problems: - -@itemize @bullet -@item -Easily manage a set of log tables. For example, you can put data from -different months into separate files, compress some of them with -@code{myisampack}, and then create a @code{MERGE} to use these as one. -@item -Give you more speed. You can split a big read-only table based on some -criteria and then put the different table part on different disks. -A @code{MERGE} table on this could be much faster than using -the big table. (You can, of course, also use a RAID to get the same -kind of benefits.) -@item -Do more efficient searches. If you know exactly what you are looking -after, you can search in just one of the split tables for some queries -and use a @code{MERGE} table for others. You can even have many -different @code{MERGE} tables active, with possible overlapping files. -@item -More efficient repairs. It's easier to repair the individual files that -are mapped to a @code{MERGE} file than trying to repair a really big file. -@item -Instant mapping of many files as one. A @code{MERGE} table uses the -index of the individual tables. It doesn't need to maintain an index of -its one. This makes @code{MERGE} table collections VERY fast to make or -remap. Note that you must specify the key definitions when you create -a @code{MERGE} table!. -@item -If you have a set of tables that you join to a big table on demand or -batch, you should instead create a @code{MERGE} table on them on demand. -This is much faster and will save a lot of disk space. -@item -Go around the file-size limit for the operating system. -@item -You can create an alias/synonym for a table by just using @code{MERGE} -over one table. There shouldn't be any really notable performance -impacts of doing this (only a couple of indirect calls and @code{memcpy()} -calls for each read). -@end itemize - -The disadvantages with @code{MERGE} tables are: - -@itemize @bullet -@item -You can only use identical @code{MyISAM} tables for a @code{MERGE} table. -@c @item -@c @code{AUTO_INCREMENT} columns are not automatically updated on @code{INSERT}. -@item -@code{REPLACE} doesn't work. -@item -@code{MERGE} tables uses more file descriptors. If you are using a -@code{MERGE} table that maps over 10 tables and 10 users are using this, you -are using 10*10 + 10 file descriptors. (10 datafiles for 10 users -and 10 shared index files.) -@item -Key reads are slower. When you do a read on a key, the @code{MERGE} -handler will need to issue a read on all underlying tables to check -which one most closely matches the given key. If you then do a 'read-next' -then the merge table handler will need to search the read buffers -to find the next key. Only when one key buffer is used up, the handler -will need to read the next key block. This makes @code{MERGE} keys much slower -on @code{eq_ref} searches, but not much slower on @code{ref} searches. -@xref{EXPLAIN}. -@item -You can't do @code{DROP TABLE}, @code{ALTER TABLE} or @code{DELETE FROM -table_name} without a @code{WHERE} clause on any of the table that is -mapped by a @code{MERGE} table that is 'open'. If you do this, the -@code{MERGE} table may still refer to the original table and you will -get unexpected results. -@end itemize - -When you create a @code{MERGE} table you have to specify with -@code{UNION(list-of-tables)} which tables you want to use as -one. Optionally you can specify with @code{INSERT_METHOD} if you want -insert for the @code{MERGE} table to happen in the first or last table -in the @code{UNION} list. If you don't specify @code{INSERT_METHOD} or -specify @code{NO}, then all @code{INSERT} commands on the @code{MERGE} -table will return an error. - -The following example shows you how to use @code{MERGE} tables: - -@example -CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20)); -CREATE TABLE t2 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20)); -INSERT INTO t1 (message) VALUES ("Testing"),("table"),("t1"); -INSERT INTO t2 (message) VALUES ("Testing"),("table"),("t2"); -CREATE TABLE total (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20)) - TYPE=MERGE UNION=(t1,t2) INSERT_METHOD=LAST; -@end example - -@c Note that we didn't create a @code{UNIQUE} or @code{PRIMARY KEY} in the -@c @code{total} table as the key isn't going to be unique in the @code{total} -@c table. - -Note that you can also manipulate the @file{.MRG} file directly from -the outside of the MySQL server: - -@example -shell> cd /mysql-data-directory/current-database -shell> ls -1 t1.MYI t2.MYI > total.MRG -shell> mysqladmin flush-tables -@end example - -Now you can do things like: - -@example -mysql> SELECT * FROM total; -+---+---------+ -| a | message | -+---+---------+ -| 1 | Testing | -| 2 | table | -| 3 | t1 | -| 1 | Testing | -| 2 | table | -| 3 | t2 | -+---+---------+ -@end example - -Note that the @code{a} column, though declared as @code{PRIMARY KEY}, -is not really unique, as @code{MERGE} table cannot enforce uniqueness -over a set of underlying @code{MyISAM} tables. - -To remap a @code{MERGE} table you can do one of the following: - -@itemize @bullet -@item -@code{DROP} the table and re-create it -@item -Use @code{ALTER TABLE table_name UNION(...)} -@item -Change the @file{.MRG} file and issue a @code{FLUSH TABLE} on the -@code{MERGE} table and all underlying tables to force the handler to -read the new definition file. -@end itemize - -@menu -* MERGE table problems:: MERGE Table Problems -@end menu - -@node MERGE table problems, , MERGE, MERGE -@subsection @code{MERGE} Table Problems - -The following are the known problems with @code{MERGE} tables: - -@itemize @bullet -@item -A @code{MERGE} table cannot maintain @code{UNIQUE} constraints over the -whole table. When you do @code{INSERT}, the data goes into the first or -last table (according to @code{INSERT_METHOD=xxx}) and this @code{MyISAM} -table ensures that the data are unique, but it knows nothing about -others @code{MyISAM} tables. -@item -@code{DELETE FROM merge_table} used without a @code{WHERE} -will only clear the mapping for the table, not delete everything in the -mapped tables. -@item -@code{RENAME TABLE} on a table used in an active @code{MERGE} table may -corrupt the table. This will be fixed in MySQL 4.0.x. -@item -Creation of a table of type @code{MERGE} doesn't check if the underlying -tables are of compatible types. If you use @code{MERGE} tables in this -fashion, you are very likely to run into strange problems. -@item -If you use @code{ALTER TABLE} to first add an @code{UNIQUE} index to a -table used in a @code{MERGE} table and then use @code{ALTER TABLE} to -add a normal index on the @code{MERGE} table, the key order will be -different for the tables if there was an old non-unique key in the -table. This is because @code{ALTER TABLE} puts @code{UNIQUE} keys before -normal keys to be able to detect duplicate keys as early as possible. -@item -The range optimiser can't yet use @code{MERGE} table efficiently and may -sometimes produce non-optimal joins. This will be fixed in MySQL 4.0.x. -@item -@code{DROP TABLE} on a table that is in use by a @code{MERGE} table will -not work on Windows because the @code{MERGE} handler does the table mapping -hidden from the upper layer of MySQL. Because Windows doesn't allow you -to drop files that are open, you first must flush all @code{MERGE} -tables (with @code{FLUSH TABLES}) or drop the @code{MERGE} table before -dropping the table. We will fix this at the same time we introduce -@code{VIEW}s. -@end itemize - -@node ISAM, HEAP, MERGE, Table types -@section @code{ISAM} Tables - -@cindex tables, ISAM - -You can also use the deprecated @code{ISAM} table type. This will disappear -rather soon (probably in MySQL 4.1) because @code{MyISAM} is a better -implementation of the same thing. @code{ISAM} uses a @code{B-tree} index. The -index is stored in a file with the @file{.ISM} extension, and the data -is stored in a file with the @file{.ISD} extension. You can -check/repair @code{ISAM} tables with the @code{isamchk} utility. @xref{Crash -recovery}. - -@code{ISAM} has the following features/properties: - -@itemize @bullet -@item Compressed and fixed-length keys -@item Fixed and dynamic record length -@item 16 keys with 16 key parts/key -@item Max key length 256 (default) -@item Data is stored in machine format; this is fast, but is machine/OS dependent. -@end itemize - -Most of the things true for @code{MyISAM} tables are also true for @code{ISAM} -tables. @xref{MyISAM, , @code{MyISAM} tables}. The major differences compared -to @code{MyISAM} tables are: - -@itemize @bullet -@item @code{ISAM} tables are not binary portable across OS/Platforms. -@item Can't handle tables > 4G. -@item Only support prefix compression on strings. -@item Smaller key limits. -@item Dynamic tables get more fragmented. -@item Tables are compressed with @code{pack_isam} rather than with @code{myisampack}. -@end itemize - -If you want to convert an @code{ISAM} table to a @code{MyISAM} table so -that you can use utilities such as @code{mysqlcheck}, use an @code{ALTER -TABLE} statement: - -@example -mysql> ALTER TABLE tbl_name TYPE = MYISAM; -@end example - -The embedded MySQL versions doesn't support @code{ISAM} tables. - -@node HEAP, InnoDB, ISAM, Table types -@section @code{HEAP} Tables - -@cindex tables, @code{HEAP} - -@code{HEAP} tables use a hashed index and are stored in memory. This -makes them very fast, but if MySQL crashes you will lose all -data stored in them. @code{HEAP} is very useful for temporary tables! - -The MySQL internal @code{HEAP} tables use 100% dynamic hashing -without overflow areas. There is no extra space needed for free lists. -@code{HEAP} tables also don't have problems with delete + inserts, which -normally is common with hashed tables: - -@example -mysql> CREATE TABLE test TYPE=HEAP SELECT ip,SUM(downloads) AS down - -> FROM log_table GROUP BY ip; -mysql> SELECT COUNT(ip),AVG(down) FROM test; -mysql> DROP TABLE test; -@end example - -Here are some things you should consider when you use @code{HEAP} tables: - -@itemize @bullet -@item -You should always use specify @code{MAX_ROWS} in the @code{CREATE} statement -to ensure that you accidentally do not use all memory. -@item -Indexes will only be used with @code{=} and @code{<=>} (but are VERY fast). -@item -@code{HEAP} tables can only use whole keys to search for a row; compare this -to @code{MyISAM} tables where any prefix of the key can be used to find rows. -@item -@code{HEAP} tables use a fixed record length format. -@item -@code{HEAP} doesn't support @code{BLOB}/@code{TEXT} columns. -@item -@code{HEAP} doesn't support @code{AUTO_INCREMENT} columns. -@item -Prior to MySQL 4.0.2, @code{HEAP} doesn't support an index on a @code{NULL} -column. -@item -You can have non-unique keys in a @code{HEAP} table (this isn't common for -hashed tables). -@item -@code{HEAP} tables are shared between all clients (just like any other -table). -@item -You can't search for the next entry in order (that is, to use the index -to do an @code{ORDER BY}). -@item -Data for @code{HEAP} tables are allocated in small blocks. The tables -are 100% dynamic (on inserting). No overflow areas and no extra key -space are needed. Deleted rows are put in a linked list and are -reused when you insert new data into the table. -@item -You need enough extra memory for all @code{HEAP} tables that you want to use at -the same time. -@item -To free memory, you should execute @code{DELETE FROM heap_table}, -@code{TRUNCATE heap_table} or @code{DROP TABLE heap_table}. -@item -MySQL cannot find out approximately how many rows there -are between two values (this is used by the range optimiser to decide which -index to use). This may affect some queries if you change a @code{MyISAM} -table to a @code{HEAP} table. -@item -To ensure that you accidentally don't do anything foolish, you can't create -@code{HEAP} tables bigger than @code{max_heap_table_size}. -@end itemize - -The memory needed for one row in a @code{HEAP} table is: - -@example -SUM_OVER_ALL_KEYS(max_length_of_key + sizeof(char*) * 2) -+ ALIGN(length_of_row+1, sizeof(char*)) -@end example - -@code{sizeof(char*)} is 4 on 32-bit machines and 8 on 64-bit machines. - - -@node InnoDB, BDB, HEAP, Table types -@section @code{InnoDB} Tables - -@menu -* InnoDB overview:: InnoDB Tables Overview -* InnoDB start:: InnoDB Startup Options -* InnoDB init:: Creating InnoDB Tablespace -* Using InnoDB tables:: Creating InnoDB Tables -* Adding and removing:: Adding and Removing InnoDB Data and Log Files -* Backing up:: Backing up and Recovering an InnoDB Database -* Moving:: Moving an InnoDB Database to Another Machine -* InnoDB transaction model:: InnoDB Transaction Model. -* Implementation:: Implementation of Multi-versioning -* Table and index:: Table and Index Structures -* File space management:: File Space Management and Disk I/O -* Error handling:: Error Handling -* InnoDB restrictions:: Restrictions on InnoDB Tables -* InnoDB change history:: InnoDB Change History -* InnoDB contact information:: InnoDB Contact Information. -@end menu - - -@node InnoDB overview, InnoDB start, InnoDB, InnoDB -@subsection InnoDB Tables Overview - -@cindex transactions, support -@cindex transaction-safe tables -@cindex ACID - -InnoDB provides MySQL with a transaction-safe (@code{ACID} compliant) -table handler with commit, rollback, and crash recovery capabilities. -InnoDB does locking on row level and also provides an Oracle-style -consistent -non-locking read in @code{SELECT}s. These features increase -multiuser concurrency and performance. There is no need for -lock escalation in InnoDB, -because row level locks in InnoDB fit in very small space. -InnoDB tables support @code{FOREIGN KEY} constraints -as the first table type in MySQL. - -InnoDB has been designed for maximum performance -when processing -large data volumes. Its CPU efficiency is probably not -matched by any other disk-based relational database engine. - -Technically, InnoDB is a complete database backend placed under MySQL. -InnoDB has its own buffer pool for caching data and indexes in main -memory. InnoDB stores its tables and indexes in a tablespace, which -may consist of several files. This is different from, for example, -MyISAM tables where each table is stored as a separate file. -InnoDB tables can be of any size also on those operating -systems where file-size is limited to 2 GB. - -You can find the latest information about InnoDB at -@uref{http://www.innodb.com/}. The most up-to-date version of the -InnoDB manual is always placed there, and you can also order -commercial licenses and support for InnoDB. - -InnoDB is currently (October 2001) used in production at -several large database sites requiring high performance. -The famous Internet news site Slashdot.org runs on -InnoDB. Mytrix, Inc. stores over 1 TB of data in -InnoDB, and another site handles an average -load of 800 inserts/updates per second in InnoDB. - -InnoDB tables are included in the MySQL source distribution -starting from 3.23.34a and are activated in the MySQL -Max -binary. For Windows the -Max binaries are contained in the -standard distribution. - -If you have downloaded a binary version of MySQL that includes -support for InnoDB, simply follow the instructions of the -MySQL manual -for installing a binary version of MySQL. If you already have -MySQL-3.23 installed, then the simplest way to install -MySQL -Max is to replace the server executable @file{mysqld} -with the corresponding executable in the -Max distribution. -MySQL and MySQL -Max differ only in the server executable. -@xref{Installing binary}. -@xref{mysqld-max, , @code{mysqld-max}}. - -To compile MySQL with InnoDB support, -download MySQL-3.23.34a or newer version from -@uref{http://www.mysql.com/} -and configure MySQL with the -@code{--with-innodb} option. See the -MySQL manual -about installing a MySQL source distribution. -@xref{Installing source}. - -@example -cd /path/to/source/of/mysql-3.23.37 -./configure --with-innodb -@end example - -To use InnoDB you have to specify InnoDB startup options in -your @file{my.cnf} or @file{my.ini} file. The minimal way -to modify it is to add to the @code{[mysqld]} section the line - -@example -innodb_data_file_path=ibdata:30M -@end example - -but to get good performance it is best that you specify options -as recommended. @xref{InnoDB start}. - -InnoDB is distributed under the GNU GPL License Version 2 (of June 1991). -In the source distribution of MySQL, InnoDB appears as a subdirectory. - - -@node InnoDB start, InnoDB init, InnoDB overview, InnoDB -@subsection InnoDB Startup Options - - -To use InnoDB tables in MySQL-Max-3.23 you MUST specify configuration -parameters -in the @code{[mysqld]} section of -the configuration file @file{my.cnf}, or on Windows optionally in -@file{my.ini}. - -At the minimum, in 3.23 you must specify @code{innodb_data_file_path} -where you specify the names and the sizes of datafiles. If you do -not mention @code{innodb_data_home_dir} in @file{my.cnf} the default -is to create these files to the @code{datadir} of MySQL. -If you specify @code{innodb_data_home_dir} as an empty string, -then you can give absolute paths to your data files in -@code{innodb_data_file_path}. -In MySQL-4.0 you do not need to specify even -@code{innodb_data_file_path}: the default for it is to create -an auto-extending 10 MB file @file{ibdata1} to the @code{datadir} -of MySQL. (In MySQL-4.0.0 and 4.0.1 the datafile is 64 MB and not -auto-extending.) - -If you don't want to use @code{InnoDB} tables, you can add the -@code{skip-innodb} option to your MySQL option file. - -But to get good performance you MUST explicitly set the InnoDB parameters -listed in the following examples. - -Starting from versions 3.23.50 and 4.0.2 InnoDB allows the last -datafile on the @code{innodb_data_file_path} line -to be specified as @strong{auto-extending}. The syntax for -@code{innodb_data_file_path} is then the following: -@example -pathtodatafile:sizespecification;pathtodatafile:sizespecification;... -... ;pathtodatafile:sizespecification[:autoextend[:max:sizespecification]] -@end example -If you specify the last datafile with the autoextend option, InnoDB -will extend the last datafile if it runs out of free space in the -tablespace. The increment is 8 MB at a time. An example: -@example -innodb_data_home_dir = -innodb_data_file_path = /ibdata/ibdata1:100M:autoextend -@end example -instructs InnoDB to create just a single datafile whose initial size is -100 MB and which is extended in 8 MB blocks when space runs out. -If the disk becomes full you may want to add another data -file to another disk, for example. Then you have to look the size -of @file{ibdata1}, round the size downward to -the closest multiple of 1024 * 1024 bytes (= 1 MB), and specify -the rounded size of @file{ibdata1} explicitly in -@code{innodb_data_file_path}. -After that you can add another datafile: -@example -innodb_data_home_dir = -innodb_data_file_path = /ibdata/ibdata1:988M;/disk2/ibdata2:50M:autoextend -@end example -Be cautious on filesystems where the maximum file-size is 2 GB! -InnoDB is not aware of the OS maximum file-size. On those filesystems -you might want to specify the max size for the datafile: -@example -innodb_data_home_dir = -innodb_data_file_path = /ibdata/ibdata1:100M:autoextend:max:2000M -@end example - -@strong{A simple @file{my.cnf} example.} Suppose you have a computer -with 128 MB RAM and one hard disk. Below is an example of -possible configuration parameters in @file{my.cnf} or -@file{my.ini} for InnoDB. We assume you are running -MySQL-Max-3.23.50 or later, or MySQL-4.0.2 or later. -This example suits most users, both on Unix and Windows, -who do not want to distribute InnoDB datafiles and -log files on several disks. This creates an -auto-extending data file @file{ibdata1} and two InnoDB log files -@file{ib_logfile0} and @file{ib_logfile1} to the -@code{datadir} of MySQL (typically @file{/mysql/data}). -Also the small archived InnoDB log file -@file{ib_arch_log_0000000000} ends up in the @code{datadir}. - -@example -[mysqld] -# You can write your other MySQL server options here -# ... -# Data file(s) must be able to -# hold your data and indexes. -# Make sure you have enough -# free disk space. -innodb_data_file_path = ibdata1:10M:autoextend -# Set buffer pool size to -# 50 - 80 % of your computer's -# memory -set-variable = innodb_buffer_pool_size=70M -set-variable = innodb_additional_mem_pool_size=10M -# Set the log file size to about -# 25 % of the buffer pool size -set-variable = innodb_log_file_size=20M -set-variable = innodb_log_buffer_size=8M -# Set ..flush_log_at_trx_commit -# to 0 if you can afford losing -# some last transactions -innodb_flush_log_at_trx_commit=1 -@end example - -@strong{Check that the MySQL server has the rights to create files} in -@code{datadir}. - -Note that datafiles must be < 2G in some file systems! -The combined size of the log files must be < 4G. The combined -size of datafiles must be >= 10 MB. - -When you for the first time create an InnoDB database, it is -best that you start the MySQL server from the command prompt. -Then InnoDB will print the information about the database -creation to the screen, and you see what is happening. -See below next section what the printout should look like. -For example, in Windows you can start @file{mysqld-max.exe} with: - -@example -your-path-to-mysqld>mysqld-max --console -@end example - -@strong{Where to put @file{my.cnf} or @file{my.ini} in Windows?} -The rules for Windows are the following: -@itemize bullet -@item Only one of @file{my.cnf} or @file{my.ini} should be created. -@item The @file{my.cnf} file should be placed in the root -directory of the drive @file{C:}. -@item The @file{my.ini} file should be placed in the WINDIR directory, e.g, -@file{C:\WINDOWS} or @file{C:\WINNT}. You can use the @code{SET} -command of MS-DOS to print the value of WINDIR. -@item If your PC uses a boot loader where the @file{C:} drive -is not the boot drive, then your only option is to use the @file{my.ini} file. -@end itemize - -@strong{Where to specify options in Unix?} -On Unix @file{mysqld} reads options from the following files, if they exist, -in the following order: -@itemize bullet -@item @file{/etc/my.cnf} Global options. -@item @file{COMPILATION_DATADIR/my.cnf} Server-specific options. -@item @file{defaults-extra-file} The file specified with -@code{--defaults-extra-file=...}. -@item @file{~/.my.cnf} User-specific options. -@end itemize -@file{COMPILATION_DATADIR} is the MySQL data directory which was -specified as a @code{./configure} option when @file{mysqld} -was compiled -(typically @file{/usr/local/mysql/data} for a binary installation or @file{/usr/local/var} for a source installation). - -If you are not sure from where @file{mysqld} reads its @file{my.cnf} -or @file{my.ini}, you can give the path as the first command-line -option to the server: -@code{mysqld --defaults-file=your_path_to_my_cnf}. - -InnoDB forms the directory path to a datafile by textually catenating -@code{innodb_data_home_dir} to a datafile name or path in -@code{innodb_data_file_path}, adding a possible slash or -backslash in between if needed. If the keyword -@code{innodb_data_home_dir} is not mentioned in -@file{my.cnf} at all, the default for it is the -'dot' directory @file{./} which means the @code{datadir} of MySQL. - -@strong{An advanced @file{my.cnf} example.} Suppose you have a Linux computer -with 2 GB RAM and three 60 GB hard disks -(at directory paths @file{/}, @file{/dr2} and -@file{/dr3}). Below is an example of possible -configuration parameters in @file{my.cnf} for InnoDB. - -@strong{Note that InnoDB does not create directories: you -have to create them yourself.} Use the Unix or MS-DOS -@code{mkdir} command to create the data and log group home directories. - -@example -[mysqld] -# You can write your other MySQL server options here -# ... -innodb_data_home_dir = -# Data files must be able to -# hold your data and indexes -innodb_data_file_path = /ibdata/ibdata1:2000M;/dr2/ibdata/ibdata2:2000M:autoextend -# Set buffer pool size to -# 50 - 80 % of your computer's -# memory, but make sure on Linux -# x86 total memory usage is -# < 2 GB -set-variable = innodb_buffer_pool_size=1G -set-variable = innodb_additional_mem_pool_size=20M -innodb_log_group_home_dir = /dr3/iblogs -# .._log_arch_dir must be the same -# as .._log_group_home_dir -innodb_log_arch_dir = /dr3/iblogs -set-variable = innodb_log_files_in_group=3 -# Set the log file size to about -# 15 % of the buffer pool size -set-variable = innodb_log_file_size=150M -set-variable = innodb_log_buffer_size=8M -# Set ..flush_log_at_trx_commit to -# 0 if you can afford losing -# some last transactions -innodb_flush_log_at_trx_commit=1 -set-variable = innodb_lock_wait_timeout=50 -#innodb_flush_method=fdatasync -#set-variable = innodb_thread_concurrency=5 -@end example - -Note that we have placed the two datafiles on different disks. -InnoDB will fill the tablespace -formed by the datafiles from bottom up. In some cases it will -improve the performance of the database if all data is not placed -on the same physical disk. Putting log files on a different disk from -data is very often beneficial for performance. -You can also use @strong{raw disk partitions} (raw devices) -as datafiles. In some Unixes -they speed up I/O. See the manual section on InnoDB file space management -about how to specify them in @file{my.cnf}. - -@strong{Warning}: on Linux x86 you must be careful you @strong{do not set memory usage -too high}. glibc will allow the process heap to grow over thread stacks, -which will crash your server. It is a risk if the value of -@example -innodb_buffer_pool_size + key_buffer + -max_connections * (sort_buffer + read_buffer_size) + max_connections * 2 MB -@end example -is close to 2 GB or exceeds 2 GB. Each thread will use a stack -(often 2 MB, but in MySQL AB binaries only 256 kB) and in the worst case also -@code{sort_buffer + read_buffer_size} -additional memory. - -@strong{How to tune other @file{mysqld} server parameters?} -Typical values which suit most users are: -@example -skip-locking -set-variable = max_connections=200 -set-variable = read_buffer_size=1M -set-variable = sort_buffer=1M -# Set key_buffer to 5 - 50% -# of your RAM depending on how -# much you use MyISAM tables, but -# keep key_buffer + InnoDB -# buffer pool size < 80% of -# your RAM -set-variable = key_buffer=... -@end example - -Note that some parameters are given using the numeric @file{my.cnf} -parameter format: @code{set-variable = innodb... = 123}, others -(string and boolean parameters) with another format: -@code{innodb_... = ... }. - - -The meanings of the configuration parameters are the following: - -@multitable @columnfractions .35 .65 -@item @strong{Option} @tab @strong{Description} -@item @code{innodb_data_home_dir} @tab -The common part of the directory path for all InnoDB datafiles. -If you do not mentioned this option in @file{my.cnf} -the default is the @code{datadir} of MySQL. -You can specify this also as an empty string, in which case you -can use absolute file paths in @code{innodb_data_file_path}. -@item @code{innodb_data_file_path} @tab -Paths to individual datafiles and their sizes. The full directory path -to each datafile is acquired by concatenating innodb_data_home_dir to -the paths specified here. The file-sizes are specified in megabytes, -hence the 'M' after the size specification above. -InnoDB also understands the abbreviation 'G', 1G meaning 1024M. -Starting from -3.23.44 you can set the file-size bigger than 4 GB on those -operating systems which support big files. -On some operating systems files must be < 2 GB. -The sum of the sizes of the files must be at least 10 MB. -@item @code{innodb_mirrored_log_groups} @tab -Number of identical copies of log groups we -keep for the database. Currently this should be set to 1. -@item @code{innodb_log_group_home_dir} @tab -Directory path to InnoDB log files. -@item @code{innodb_log_files_in_group} @tab -Number of log files in the log group. InnoDB writes to the files in a -circular fashion. Value 3 is recommended here. -@item @code{innodb_log_file_size} @tab -Size of each log file in a log group in megabytes. Sensible values range -from 1M to 1/nth of the size of the buffer pool specified below, -where n is the number of log files in the group. The -bigger the value, -the less checkpoint flush activity is needed in the buffer pool, -saving disk I/O. But bigger log files also mean that recovery will be -slower in case of a crash. The combined size of log files must -be < 4 GB on 32-bit computers. -@item @code{innodb_log_buffer_size} @tab -The size of the buffer which InnoDB uses to write log to the log files -on disk. Sensible values range from 1M to 8M. -A big log buffer allows large transactions to run without a need -to write the log to disk until the transaction commit. Thus, if you have -big transactions, making the log buffer big will save disk I/O. -@item @code{innodb_flush_log_at_trx_commit} @tab -Normally this is set to 1, meaning that at a transaction commit the log -is flushed to disk, and the modifications made by the transaction become -permanent, and survive a database crash. If you are willing to -compromise this safety, and you are running small transactions, you may -set this to 0 to reduce disk I/O to the logs. -@item @code{innodb_log_arch_dir} @tab -The directory where fully written log files would be archived if we used -log archiving. The value of this parameter should currently be set the -same as @code{innodb_log_group_home_dir}. -@item @code{innodb_log_archive} @tab -This value should currently be set to 0. As recovery from a backup is -done by MySQL using its own log files, there is currently no need to -archive InnoDB log files. -@item @code{innodb_buffer_pool_size} @tab -The size of the memory buffer InnoDB uses to cache data and indexes of -its tables. The bigger you set this the less disk I/O is needed to -access data in tables. On a dedicated database server you may set this -parameter up to 80% of the machine physical memory size. Do not set it -too large, though, because competition of the physical memory may cause -paging in the operating system. -@item @code{innodb_additional_mem_pool_size} @tab -Size of a memory pool InnoDB uses to store data dictionary information -and other internal data structures. A sensible value for this might be -2M, but the more tables you have in your application the more you will -need to allocate here. If InnoDB runs out of memory in this pool, it -will start to allocate memory from the operating system, and write -warning messages to the MySQL error log. -@item @code{innodb_file_io_threads} @tab -Number of file I/O threads in InnoDB. Normally, this should be 4, but -on Windows disk I/O may benefit from a larger number. -@item @code{innodb_lock_wait_timeout} @tab -Timeout in seconds an InnoDB transaction may wait for a lock before -being rolled back. InnoDB automatically detects transaction deadlocks -in its own lock table and rolls back the transaction. If you use -@code{LOCK TABLES} command, or other transaction-safe table handlers -than InnoDB in the same transaction, then a deadlock may arise which -InnoDB cannot notice. In cases like this the timeout is useful to -resolve the situation. -@item @code{innodb_flush_method} @tab -(Available from 3.23.40 up.) -The default value for this is @code{fdatasync}. -Another option is @code{O_DSYNC}. -@end multitable - - -@node InnoDB init, Using InnoDB tables, InnoDB start, InnoDB -@subsection Creating InnoDB Tablespace - -Suppose you have installed MySQL and have edited @file{my.cnf} so that -it contains the necessary InnoDB configuration parameters. -Before starting MySQL you should check that the directories you have -specified for InnoDB datafiles and log files exist and that you have -access rights to those directories. InnoDB -cannot create directories, only files. Check also you have enough disk space -for the data and log files. - -When you now start MySQL, InnoDB will start creating your datafiles -and log files. InnoDB will print something like the following: - -@example -~/mysqlm/sql > mysqld -InnoDB: The first specified datafile /home/heikki/data/ibdata1 -did not exist: -InnoDB: a new database to be created! -InnoDB: Setting file /home/heikki/data/ibdata1 size to 134217728 -InnoDB: Database physically writes the file full: wait... -InnoDB: datafile /home/heikki/data/ibdata2 did not exist: -new to be created -InnoDB: Setting file /home/heikki/data/ibdata2 size to 262144000 -InnoDB: Database physically writes the file full: wait... -InnoDB: Log file /home/heikki/data/logs/ib_logfile0 did not exist: -new to be created -InnoDB: Setting log file /home/heikki/data/logs/ib_logfile0 size to 5242880 -InnoDB: Log file /home/heikki/data/logs/ib_logfile1 did not exist: -new to be created -InnoDB: Setting log file /home/heikki/data/logs/ib_logfile1 size to 5242880 -InnoDB: Log file /home/heikki/data/logs/ib_logfile2 did not exist: -new to be created -InnoDB: Setting log file /home/heikki/data/logs/ib_logfile2 size to 5242880 -InnoDB: Started -mysqld: ready for connections -@end example - -A new InnoDB database has now been created. You can connect to the MySQL -server with the usual MySQL client programs like @code{mysql}. -When you shut down the MySQL server with @file{mysqladmin shutdown}, -InnoDB output will be like the following: - -@example -010321 18:33:34 mysqld: Normal shutdown -010321 18:33:34 mysqld: Shutdown Complete -InnoDB: Starting shutdown... -InnoDB: Shutdown completed -@end example - -You can now look at the datafiles and logs directories and you -will see the files created. The log directory will also contain -a small file named @file{ib_arch_log_0000000000}. That file -resulted from the database creation, after which InnoDB switched off -log archiving. -When MySQL is again started, the output will be like the following: - -@example -~/mysqlm/sql > mysqld -InnoDB: Started -mysqld: ready for connections -@end example - -@menu -* Error creating InnoDB:: If something goes wrong in database creation -@end menu - - -@node Error creating InnoDB, , InnoDB init, InnoDB init -@subsubsection If Something Goes Wrong in Database Creation - -If InnoDB prints an operating system error in a file operation, -usually the problem is one of the following: - -@itemize @bullet -@item You did not create InnoDB data or log directories. -@item @file{mysqld} does not have the rights to create files in those -directories. -@item @file{mysqld} does not read the right @file{my.cnf} or @file{my.ini} -file, and consequently does not see the options you specified. -@item The disk is full or a disk quota is exceeded. -@item You have created a subdirectory whose name is equal to a datafile -you specified. -@item There is a syntax error in @code{innodb_data_home_dir} -or @code{innodb_data_file_path}. -@end itemize - -If something goes wrong in an InnoDB database creation, you should -delete all files created by InnoDB. This means all datafiles, all log -files, the small archived log file, and in the case you already did -create some InnoDB tables, delete also the corresponding @file{.frm} -files for these tables from the MySQL database -directories. Then you can try the InnoDB database creation again. - - -@node Using InnoDB tables, Adding and removing, InnoDB init, InnoDB -@subsection Creating InnoDB Tables - -Suppose you have started the MySQL client with the command -@code{mysql test}. -To create a table in the InnoDB format you must specify -@code{TYPE = InnoDB} in the table creation SQL command: - -@example -CREATE TABLE CUSTOMER (A INT, B CHAR (20), INDEX (A)) TYPE = InnoDB; -@end example - -This SQL command will create a table and an index on column @code{A} -into the InnoDB tablespace consisting of the datafiles you specified -in @file{my.cnf}. In addition MySQL will create a file -@file{CUSTOMER.frm} to the MySQL database directory @file{test}. -Internally, InnoDB will add to its own data dictionary an entry -for table @code{'test/CUSTOMER'}. Thus you can create a table -of the same name @code{CUSTOMER} in another database of MySQL, and -the table names will not collide inside InnoDB. - -You can query the amount of free space in the InnoDB tablespace -by issuing the table status command of MySQL for any table you have -created with @code{TYPE = InnoDB}. Then the amount of free -space in the tablespace appears in the table comment section in the -output of @code{SHOW}. An example: - -@example -SHOW TABLE STATUS FROM test LIKE 'CUSTOMER' -@end example - -Note that the statistics @code{SHOW} gives about InnoDB tables -are only approximate: they are used in SQL optimisation. Table and -index reserved sizes in bytes are accurate, though. - -@subsubsection Converting MyISAM Tables to InnoDB - -InnoDB does not have a special optimisation for separate index creation. -Therefore it does not pay to export and import the table and create indexes -afterwards. -The fastest way to alter a table to InnoDB is to do the inserts -directly to an InnoDB table, that is, use @code{ALTER TABLE ... TYPE=INNODB}, -or create an empty InnoDB table with identical definitions and insert -the rows with @code{INSERT INTO ... SELECT * FROM ...}. - -To get better control over the insertion process, it may be good to insert -big tables in pieces: - -@example -INSERT INTO newtable SELECT * FROM oldtable - WHERE yourkey > something AND yourkey <= somethingelse; -@end example - -After all data has been inserted you can rename the tables. - -During the conversion of big tables you should set the InnoDB -buffer pool size big -to reduce disk I/O. Not bigger than 80% of the physical memory, though. -You should set InnoDB log files big, and also the log buffer large. - -Make sure you do not run out of tablespace: InnoDB tables take a lot -more space than MyISAM tables. If an @code{ALTER TABLE} runs out -of space, it will start a rollback, and that can take hours if it is -disk-bound. -In inserts InnoDB uses the insert buffer to merge secondary index records -to indexes in batches. That saves a lot of disk I/O. In rollback no such -mechanism is used, and the rollback can take 30 times longer than the -insertion. - -In the case of a runaway rollback, if you do not have valuable data in your -database, -it is better that you kill the database process and delete all InnoDB data -and log files and all InnoDB table @file{.frm} files, and start -your job again, rather than wait for millions of disk I/Os to complete. - -@subsubsection Foreign Key Constraints - -Starting from version 3.23.43b InnoDB features foreign key constraints. -InnoDB is the first MySQL table type which allows you to define foreign key -constraints to guard the integrity of your data. - -The syntax of a foreign key constraint definition in InnoDB: -@example -[CONSTRAINT symbol] FOREIGN KEY (index_col_name, ...) - REFERENCES table_name (index_col_name, ...) - [ON DELETE CASCADE | ON DELETE SET NULL] -@end example -Both tables have to be InnoDB type and @strong{there must be an index -where the foreign key and the referenced key are listed as the first -columns}. InnoDB does not auto-create indexes on foreign keys or -referenced keys: you have to create them explicitly. - -Corresponding columns in the foreign key -and the referenced key must have similar internal data types -inside InnoDB so that they can be compared without a type -conversion. -The @strong{size and the signedness of integer types has to be the same}. -The length of string types need not be the same. - -Starting from version 3.23.50 you can also associate the -@code{ON DELETE CASCADE} or @code{ON DELETE SET NULL} -clause with the foreign key constraint. - -If @code{ON DELETE CASCADE} is specified, and a row in the parent -table is deleted, then InnoDB automatically deletes also all those rows -in the child table whose foreign key values are equal to -the referenced key value in the parent row. If @code{ON DELETE SET NULL} -is specified, the child rows are automatically updated so that the -columns in the foreign key are set to the SQL NULL value. - -Starting from version 3.23.50, InnoDB does not check foreign key -constraints on those foreign key or referenced key values -which contain a NULL column. - -Starting from version 3.23.50 the InnoDB parser allows you to -use backquotes (`) around table and column names in the -@code{FOREIGN KEY ... REFERENCES ...} clause -but the InnoDB parser is not yet aware of the option -@code{lower_case_table_names} you can specify in @file{my.cnf}. - - -An example: -@example -CREATE TABLE parent(id INT NOT NULL, PRIMARY KEY (id)) TYPE=INNODB; -CREATE TABLE child(id INT, parent_id INT, INDEX par_ind (parent_id), - FOREIGN KEY (parent_id) REFERENCES parent(id) - ON DELETE SET NULL -) TYPE=INNODB; -@end example - -If MySQL gives the error number 1005 from a @code{CREATE TABLE} -statement, and the error message string refers to errno 150, then -the table creation failed because a foreign key constraint was not -correctly formed. -Similarly, if an @code{ALTER TABLE} fails and it refers to errno -150, that means a foreign key definition would be incorrectly -formed for the altered table. - -Starting from version 3.23.50 InnoDB allows you to add a new -foreign key constraint to a table through -@example -ALTER TABLE yourtablename -ADD [CONSTRAINT symbol] FOREIGN KEY (...) REFERENCES anothertablename(...) -@end example -Remember to create the required indexes first, though. - -In InnoDB versions < 3.23.50 @code{ALTER TABLE} -or @code{CREATE INDEX} -should not be used in connection with tables which have foreign -key constraints or which are referenced in foreign key constraints: -Any @code{ALTER TABLE} removes all foreign key -constrainst defined for the table. You should not use -@code{ALTER TABLE} to the referenced table either, but -use @code{DROP TABLE} and @code{CREATE TABLE} to modify the -schema. When MySQL does an @code{ALTER TABLE} it may internally -use @code{RENAME TABLE}, and that will confuse the -foreign key costraints which refer to the table. -A @code{CREATE INDEX} statement is in MySQL -processed as an @code{ALTER TABLE}, and these -restrictions apply also to it. - -When doing foreign key checks InnoDB sets shared row -level locks on child or parent records it has to look at. -InnoDB checks foreign key constraints immediately: the check -is not deferred to transaction commit. - -InnoDB allows you to drop any table even though that -would break the foreign key constraints which reference -the table. When you drop a table the constraints which -were defined in its create statement are also dropped. - -If you re-create a table which was dropped, it has to have -a definition which conforms to the foreign key constraints -referencing it. It must have the right column names and types, -and it must have indexes on the referenced keys, as stated above. -If these are not satisfied, MySQL returns error number 1005 -and refers to errno 150 in the error message string. - -Starting from version 3.23.50 InnoDB returns the foreign key -definitions of a table when you call -@example -SHOW CREATE TABLE yourtablename -@end example -Then also @file{mysqldump} produces correct definitions -of tables to the dump file, and does not forget about the -foreign keys. - -You can also list the foreign key constraints for a table -@code{T} with -@example -SHOW TABLE STATUS FROM yourdatabasename LIKE 'T' -@end example -The foreign key constraints are listed in the table comment of -the output. - -@node Adding and removing, Backing up, Using InnoDB tables, InnoDB -@subsection Adding and Removing InnoDB Data and Log Files - -From version 3.23.50 and 4.0.2 you can specify the last InnoDB datafile -to @code{autoextend}. Alternatively, you can increase to your tablespace -by specifying an additional datafile. To do this you have to shut down -the MySQL server, edit the @file{my.cnf} file adding a new datafile -to @code{innodb_data_file_path}, and then start the MySQL server again. - -Currently you cannot remove a datafile from InnoDB. To decrease the -size of your database you have to use @file{mysqldump} to dump -all your tables, create a new database, and import your tables to the -new database. - -If you want to change the number or the size of your InnoDB log files, -you have to shut down MySQL and make sure that it shuts down without errors. -Then copy the old log files into a safe place just in case something -went wrong in the shutdown and you will need them to recover the -database. Delete then the old log files from the log file directory, -edit @file{my.cnf}, and start MySQL again. InnoDB will tell -you at the startup that it is creating new log files. - - -@node Backing up, Moving, Adding and removing, InnoDB -@subsection Backing up and Recovering an InnoDB Database - -The key to safe database management is taking regular backups. - -InnoDB Hot Backup is an online backup tool you can use to -backup your InnoDB database while it is running. InnoDB -Hot Backup does not require you to shut down your database -and it does not set any locks or disturb your normal -database processing. InnoDB Hot Backup is a non-free -additional tool which is not included in the standard -MySQL distribution. See the InnoDB Hot Backup homepage -@uref{http://www.innodb.com/hotbackup.html} -for detailed information and screenshots. - -If you are able to shut down your MySQL server, then to take -a 'binary' backup of your database you have to do the following: - -@itemize @bullet -@item -Shut down your MySQL database and make sure it shuts down without errors. -@item -Copy all your datafiles into a safe place. -@item -Copy all your InnoDB log files to a safe place. -@item -Copy your @file{my.cnf} configuration file(s) to a safe place. -@item -Copy all the @file{.frm} files for your InnoDB tables into a -safe place. -@end itemize - -In addition to taking the binary backups described above, -you should also regularly take dumps of your tables with -@file{mysqldump}. The reason to this is that a binary file -may be corrupted without you noticing it. Dumped tables are stored -into text files which are human-readable and much simpler than -database binary files. Seeing table corruption from dumped files -is easier, and since their format is simpler, the chance for -serious data corruption in them is smaller. - -A good idea is to take the dumps at the same time you take a binary -backup of your database. You have to shut out all clients from your -database to get a consistent snapshot of all your tables into your -dumps. Then you can take the binary backup, and you will then have -a consistent snapshot of your database in two formats. - -To be able to recover your InnoDB database to the present from the -binary backup described above, you have to run your MySQL database -with the general logging and log archiving of MySQL switched on. Here -by the general logging we mean the logging mechanism of the MySQL server -which is independent of InnoDB logs. - -To recover from a crash of your MySQL server process, the only thing -you have to do is to restart it. InnoDB will automatically check the -logs and perform a roll-forward of the database to the present. -InnoDB will automatically roll back uncommitted transactions which were -present at the time of the crash. During recovery, InnoDB will print -out something like the following: - -@example -~/mysqlm/sql > mysqld -InnoDB: Database was not shut down normally. -InnoDB: Starting recovery from log files... -InnoDB: Starting log scan based on checkpoint at -InnoDB: log sequence number 0 13674004 -InnoDB: Doing recovery: scanned up to log sequence number 0 13739520 -InnoDB: Doing recovery: scanned up to log sequence number 0 13805056 -InnoDB: Doing recovery: scanned up to log sequence number 0 13870592 -InnoDB: Doing recovery: scanned up to log sequence number 0 13936128 -... -InnoDB: Doing recovery: scanned up to log sequence number 0 20555264 -InnoDB: Doing recovery: scanned up to log sequence number 0 20620800 -InnoDB: Doing recovery: scanned up to log sequence number 0 20664692 -InnoDB: 1 uncommitted transaction(s) which must be rolled back -InnoDB: Starting rollback of uncommitted transactions -InnoDB: Rolling back trx no 16745 -InnoDB: Rolling back of trx no 16745 completed -InnoDB: Rollback of uncommitted transactions completed -InnoDB: Starting an apply batch of log records to the database... -InnoDB: Apply batch completed -InnoDB: Started -mysqld: ready for connections -@end example - -If your database gets corrupted or your disk fails, you have -to do the recovery from a backup. In the case of corruption, you should -first find a backup which is not corrupted. From a backup do the recovery -from the general log files of MySQL according to instructions in the -MySQL manual. - -@menu -* InnoDB checkpoints:: Checkpoints -@end menu - - -@node InnoDB checkpoints, , Backing up, Backing up -@subsubsection Checkpoints - -InnoDB implements a checkpoint mechanism called a fuzzy -checkpoint. InnoDB will flush modified database pages from the buffer -pool in small batches, there is no need to flush the buffer pool -in one single batch, which would in practice stop processing -of user SQL statements for a while. - -In crash recovery InnoDB looks for a checkpoint label written -to the log files. It knows that all modifications to the database -before the label are already present on the disk image of the database. -Then InnoDB scans the log files forward from the place of the checkpoint -applying the logged modifications to the database. - -InnoDB writes to the log files in a circular fashion. -All committed modifications which make the database pages in the buffer -pool different from the images on disk must be available in the log files -in case InnoDB has to do a recovery. This means that when InnoDB starts -to reuse a log file in the circular fashion, it has to make sure that the -database page images on disk already contain the modifications -logged in the log file InnoDB is going to reuse. In other words, InnoDB -has to make a checkpoint and often this involves flushing of -modified database pages to disk. - -The above explains why making your log files very big may save -disk I/O in checkpointing. It can make sense to set -the total size of the log files as big as the buffer pool or even bigger. -The drawback in big log files is that crash recovery can last longer -because there will be more log to apply to the database. - - -@node Moving, InnoDB transaction model, Backing up, InnoDB -@subsection Moving an InnoDB Database to Another Machine - -InnoDB data and log files are binary-compatible on all platforms -if the floating-point number format on the machines is the same. -You can move an InnoDB database simply by copying all the relevant -files, which we already listed in the previous section on backing up -a database. If the floating-point formats on the machines are -different but you have not used @code{FLOAT} or @code{DOUBLE} -data types in your tables then the procedure is the same: just copy -the relevant files. If the formats are different and your tables -contain floating-point data, you have to use @file{mysqldump} -and @file{mysqlimport} to move those tables. - -A performance tip is to switch off auto-commit mode when you import -data into your database, assuming your tablespace has enough space for -the big rollback segment the big import transaction will generate. -Do the commit only after importing a whole table or a segment of -a table. - - -@node InnoDB transaction model, Implementation, Moving, InnoDB -@subsection InnoDB Transaction Model - -In the InnoDB transaction model the goal has been to combine the best -properties of a multi-versioning database to traditional two-phase locking. -InnoDB does locking on row level and runs queries by default -as non-locking consistent reads, in the style of Oracle. -The lock table in InnoDB is stored so space-efficiently that lock -escalation is not needed: typically several users are allowed -to lock every row in the database, or any random subset of the rows, -without InnoDB running out of memory. - -In InnoDB all user activity happens inside transactions. If the -auto-commit mode is used in MySQL, then each SQL statement -will form a single transaction. If the auto-commit mode is -switched off, then we can think that a user always has a transaction -open. If he issues -the SQL @code{COMMIT} or @code{ROLLBACK} statement, that -ends the current transaction, and a new starts. Both statements -will release all InnoDB locks that were set during the -current transaction. A @code{COMMIT} means that the -changes made in the current transaction are made permanent -and become visible to other users. A @code{ROLLBACK} -on the other hand cancels all modifications made by the current -transaction. - -@menu -* InnoDB consistent read:: Consistent Read -* InnoDB locking reads:: Locking Reads -* InnoDB Next-key locking:: Next-key Locking: Avoiding the Phantom Problem -* InnoDB Locks set:: Locks Set by Different SQL Statements in InnoDB -* InnoDB Deadlock detection:: Deadlock Detection and Rollback -* InnoDB Consistent read example:: An Example of How the Consistent Read Works in InnoDB -* Innodb deadlocks:: -* Innodb tuning:: -* Innodb Monitor:: -@end menu - - -@node InnoDB consistent read, InnoDB locking reads, InnoDB transaction model, InnoDB transaction model -@subsubsection Consistent Read - -A consistent read means that InnoDB uses its multi-versioning to -present to a query a snapshot of the database at a point in time. -The query will see the changes made by exactly those transactions that -committed before that point of time, and no changes made by later -or uncommitted transactions. The exception to this rule is that the -query will see the changes made by the transaction itself which issues -the query. - -When a transaction issues its first consistent read, InnoDB assigns -the snapshot, or the point of time, which all consistent reads in the -same transaction will use. In the snapshot are all transactions that -committed before assigning the snapshot. Thus the consistent reads -within the same transaction will also be consistent with respect to each -other. You can get a fresher snapshot for your queries by committing -the current transaction and after that issuing new queries. - -Consistent read is the default mode in which InnoDB processes -@code{SELECT} statements. A consistent read does not set any locks -on the tables it accesses, and therefore other users are free to -modify those tables at the same time a consistent read is being performed -on the table. - - -@node InnoDB locking reads, InnoDB Next-key locking, InnoDB consistent read, InnoDB transaction model -@subsubsection Locking Reads - -A consistent read is not convenient in some circumstances. -Suppose you want to add a new row into your table @code{CHILD}, -and make sure that the child already has a parent in table -@code{PARENT}. - -Suppose you use a consistent read to read the table @code{PARENT} -and indeed see the parent of the child in the table. Can you now safely -add the child row to table @code{CHILD}? No, because it may -happen that meanwhile some other user has deleted the parent row -from the table @code{PARENT}, and you are not aware of that. - -The solution is to perform the @code{SELECT} in a locking -mode, @code{LOCK IN SHARE MODE}. - -@example -SELECT * FROM PARENT WHERE NAME = 'Jones' LOCK IN SHARE MODE; -@end example - -Performing a read in share mode means that we read the latest -available data, and set a shared mode lock on the rows we read. -If the latest data belongs to a yet uncommitted transaction of another -user, we will wait until that transaction commits. -A shared mode lock prevents others from updating or deleting -the row we have read. After we see that the above query returns -the parent @code{'Jones'}, we can safely add his child -to table @code{CHILD}, and commit our transaction. -This example shows how to implement referential -integrity in your application code. - -Let us look at another example: we have an integer counter field in -a table @code{CHILD_CODES} which we use to assign -a unique identifier to each child we add to table @code{CHILD}. -Obviously, using a consistent read or a shared mode read -to read the present value of the counter is not a good idea, since -then two users of the database may see the same value for the -counter, and we will get a duplicate key error when we add -the two children with the same identifier to the table. - -In this case there are two good ways to implement the -reading and incrementing of the counter: (1) update the counter -first by incrementing it by 1 and only after that read it, -or (2) read the counter first with -a lock mode @code{FOR UPDATE}, and increment after that: - -@example -SELECT COUNTER_FIELD FROM CHILD_CODES FOR UPDATE; -UPDATE CHILD_CODES SET COUNTER_FIELD = COUNTER_FIELD + 1; -@end example - -A @code{SELECT ... FOR UPDATE} will read the latest -available data setting exclusive locks on each row it reads. -Thus it sets the same locks a searched SQL @code{UPDATE} would set -on the rows. - - -@node InnoDB Next-key locking, InnoDB Locks set, InnoDB locking reads, InnoDB transaction model -@subsubsection Next-key Locking: Avoiding the Phantom Problem - -In row level locking InnoDB uses an algorithm called next-key locking. -InnoDB does the row level locking so that when it searches or -scans an index of a table, it sets shared or exclusive locks -on the index records in encounters. Thus the row level locks are -more precisely called index record locks. - -The locks InnoDB sets on index records also affect the 'gap' -before that index record. If a user has a shared or exclusive -lock on record R in an index, then another user cannot insert -a new index record immediately before R in the index order. -This locking of gaps is done to prevent the so-called phantom -problem. Suppose I want to read and lock all children with identifier -bigger than 100 from table @code{CHILD}, -and update some field in the selected rows. - -@example -SELECT * FROM CHILD WHERE ID > 100 FOR UPDATE; -@end example - -Suppose there is an index on table @code{CHILD} on column -@code{ID}. Our query will scan that index starting from -the first record where @code{ID} is bigger than 100. -Now, if the locks set on the index records would not lock out -inserts made in the gaps, a new child might meanwhile be -inserted to the table. If now I in my transaction execute - -@example -SELECT * FROM CHILD WHERE ID > 100 FOR UPDATE; -@end example - -again, I will see a new child in the result set the query returns. -This is against the isolation principle of transactions: -a transaction should be able to run so that the data -it has read does not change during the transaction. If we regard -a set of rows as a data item, then the new 'phantom' child would break -this isolation principle. - -When InnoDB scans an index it can also lock the gap -after the last record in the index. Just that happens in the previous -example: the locks set by InnoDB will prevent any insert to -the table where @code{ID} would be bigger than 100. - -You can use next-key locking to implement a uniqueness -check in your application: if you read your data in share mode -and do not see a duplicate for a row you are going to insert, -then you can safely insert your row and know that the next-key -lock set on the successor of your row during the read will prevent -anyone meanwhile inserting a duplicate for your row. Thus the next-key -locking allows you to 'lock' the non-existence of something in your -table. - -@node InnoDB Locks set, InnoDB Deadlock detection, InnoDB Next-key locking, InnoDB transaction model -@subsubsection Locks Set by Different SQL Statements in InnoDB - -@itemize @bullet -@item -@code{SELECT ... FROM ...} : this is a consistent read, reading a -snapshot of the database and setting no locks. -@item -@code{SELECT ... FROM ... LOCK IN SHARE MODE} : sets shared next-key locks -on all index records the read encounters. -@item -@code{SELECT ... FROM ... FOR UPDATE} : sets exclusive next-key locks -on all index records the read encounters. -@item -@code{INSERT INTO ... VALUES (...)} : sets an exclusive lock -on the inserted row; note that this lock is not a next-key lock -and does not prevent other users from inserting to the gap before the -inserted row. If a duplicate key error occurs, sets a shared lock -on the duplicate index record. -@item -@code{INSERT INTO T SELECT ... FROM S WHERE ...} sets an exclusive -(non-next-key) lock on each row inserted into @code{T}. Does -the search on @code{S} as a consistent read, but sets shared next-key -locks on @code{S} if the MySQL logging is on. InnoDB has to set -locks in the latter case because in roll-forward recovery from a -backup every SQL statement has to be executed in exactly the same -way as it was done originally. -@item -@code{CREATE TABLE ... SELECT ...} performs the @code{SELECT} -as a consistent read or with shared locks, like in the previous -item. -@item -@code{REPLACE} is done like an insert if there is no collision -on a unique key. Otherwise, an exclusive next-key lock is placed -on the row which has to be updated. -@item -@code{UPDATE ... SET ... WHERE ...} : sets an exclusive next-key -lock on every record the search encounters. -@item -@code{DELETE FROM ... WHERE ...} : sets an exclusive next-key -lock on every record the search encounters. -@item -If a @code{FOREIGN KEY} constraint is defined on a table, -any insert, update, or delete which requires checking of the constraint -condition sets shared record level locks on the records it -looks at to check the constraint. Also in the case where the -constraint fails, InnoDB sets these locks. -@item -@code{LOCK TABLES ... } : sets table locks. In the implementation -the MySQL layer of code sets these locks. The automatic deadlock detection -of InnoDB cannot detect deadlocks where such table locks are involved: -see the following section. -Also, since MySQL does know about row level locks, -it is possible that you -get a table lock on a table where another user currently has row level -locks. But that does not put transaction integerity into danger. -@xref{InnoDB restrictions}. -@end itemize - - -@node InnoDB Deadlock detection, InnoDB Consistent read example, InnoDB Locks set, InnoDB transaction model -@subsubsection Deadlock Detection and Rollback - -InnoDB automatically detects a deadlock of transactions and rolls -back the transaction whose lock request was the last one to build -a deadlock, that is, a cycle in the waits-for graph of transactions. -InnoDB cannot detect deadlocks where a lock set by a MySQL -@code{LOCK TABLES} statement is involved, or if a lock set -in another table handler than InnoDB is involved. You have to resolve -these situations using @code{innodb_lock_wait_timeout} set in -@file{my.cnf}. - -When InnoDB performs a complete rollback of a transaction, all the -locks of the transaction are released. However, if just a single SQL -statement is rolled back as a result of an error, some of the locks -set by the SQL statement may be preserved. This is because InnoDB -stores row locks in a format where it cannot afterwards know which was -set by which SQL statement. - -@node InnoDB Consistent read example, Innodb deadlocks, InnoDB Deadlock detection, InnoDB transaction model -@subsubsection An Example of How the Consistent Read Works in InnoDB - -When you issue a consistent read, that is, an ordinary @code{SELECT} -statement, InnoDB will give your transaction a timepoint according -to which your query sees the database. Thus, if transaction B deletes -a row and commits after your timepoint was assigned, then you will -not see the row deleted. Similarly with inserts and updates. - -You can advance your timepoint by committing your transaction -and then doing another @code{SELECT}. - -This is called multi-versioned concurrency control. - -@example - User A User B - - SET AUTOCOMMIT=0; SET AUTOCOMMIT=0; -time -| SELECT * FROM t; -| empty set -| INSERT INTO t VALUES (1, 2); -| -v SELECT * FROM t; - empty set - COMMIT; - - SELECT * FROM t; - empty set; - - COMMIT; - - SELECT * FROM t; - --------------------- - | 1 | 2 | - --------------------- -@end example - -Thus user A sees the row inserted by B only when B has committed the -insert, and A has committed his own transaction so that the timepoint -is advanced past the commit of B. - -If you want to see the ``freshest'' state of the database, you should -use a locking read: - -@example -SELECT * FROM t LOCK IN SHARE MODE; -@end example - -@node Innodb deadlocks, Innodb tuning, InnoDB Consistent read example, InnoDB transaction model -@subsubsection How to cope with deadlocks? - -Deadlocks are a classic problem in transactional databases, -but they are not dangerous unless they are so frequent -that you cannot run certain transactions at all. -Normally you have to write your applications so -that they are always prepared to re-issue a -transaction if it gets rolled back because of a deadlock. - -InnoDB uses automatic row level locking. You can get -deadlocks even in the case of transactions which just -insert or delete a single row. That is because -these operations are not really 'atomic': they -automatically set locks on the (possibly several) index -records of the row inserted/deleted. - -You can cope with deadlocks and reduce the number of -them with the following tricks: - -@itemize @bullet -@item -Always be prepared to re-issue a transaction if it fails -in a deadlock. Deadlocks are not dangerous. Just try again. -@item -Commit your transactions often. Small transactions are less -prone to collide. -@item -Access your tables and rows in a fixed order. Then -transactions will form nice queues, and do not deadlock. -@item -Use less locking: if you can afford a @code{SELECT} to return -data from an old snapshot, do not add the clause -@code{FOR UPDATE} or @code{LOCK IN SHARE MODE} to it. -@item -If nothing helps, serialise your transactions with table level -locks: @code{LOCK TABLES t1 WRITE, t2 READ, ... ; -[do something with tables t1 and t2 here]; UNLOCK TABLES.} -Table level locks make you transactions to queue nicely, -and deadlocks are avoided. Note that @code{LOCK TABLES} implicitly -starts a transaction, just like the command @code{BEGIN}, -and @code{UNLOCK TABLES} implicitly ends the transaction in a -@code{COMMIT}. -@end itemize - -@node Innodb tuning, Innodb Monitor, Innodb deadlocks, InnoDB transaction model -@subsubsection Performance Tuning Tips - -@strong{1.} -If the Unix @file{top} or the Windows @file{Task Manager} shows that -the CPU usage percentage with your workload is less than 70%, -your workload is probably -disk-bound. Maybe you are making too many transaction commits, or the -buffer pool is too small. -Making the buffer pool bigger can help, but do not set -it bigger than 80% of physical memory. - -@strong{2.} -Wrap several modifications into one transaction. InnoDB must -flush the log to disk at each transaction commit, if that transaction -made modifications to the database. Since the rotation speed of a disk -is typically -at most 167 revolutions/second, that constrains the number of commits -to the same 167/second if the disk does not fool the operating system. - -@strong{3.} -If you can afford the loss of some latest committed transactions, you can -set the @file{my.cnf} parameter @code{innodb_flush_log_at_trx_commit} -to zero. InnoDB tries to flush the log anyway once in a second, -though the flush is not guaranteed. - -@strong{4.} -Make your log files big, even as big as the buffer pool. When InnoDB -has written the log files full, it has to write the modified contents -of the buffer pool to disk in a checkpoint. Small log files will cause many -unnecessary disk writes. The drawback in big log files is that recovery -time will be longer. - -@strong{5.} -Also the log buffer should be quite big, say 8 MB. - -@strong{6.} (Relevant from 3.23.39 up.) -In some versions of Linux and Unix, flushing files to disk with the Unix -@code{fdatasync} and other similar methods is surprisingly slow. -The default method InnoDB uses is the @code{fdatasync} function. -If you are not satisfied with the database write performance, you may -try setting @code{innodb_flush_method} in @file{my.cnf} -to @code{O_DSYNC}, though O_DSYNC seems to be slower on most systems. - -@strong{7.} In importing data to InnoDB, make sure that MySQL does not have -@code{autocommit=1} on. Then every insert requires a log flush to disk. -Put before your plain SQL import file line - -@example -SET AUTOCOMMIT=0; -@end example - -and after it - -@example -COMMIT; -@end example - -If you use the @file{mysqldump} option @code{--opt}, you will get dump -files which are fast to import also to an InnoDB table, even without wrapping -them to the above @code{SET AUTOCOMMIT=0; ... COMMIT;} wrappers. - -@strong{8.} -Beware of big rollbacks of mass inserts: InnoDB uses the insert buffer -to save disk I/O in inserts, but in a corresponding rollback no such -mechanism is used. A disk-bound rollback can take 30 times the time -of the corresponding insert. Killing the database process will not -help because the rollback will start again at the database startup. The -only way to get rid of a runaway rollback is to increase the buffer pool -so that the rollback becomes CPU-bound and runs fast, or delete the whole -InnoDB database. - -@strong{9.} -Beware also of other big disk-bound operations. -Use @code{DROP TABLE} or @code{TRUNCATE} (from MySQL-4.0 up) to empty a -table, not @code{DELETE FROM yourtable}. - -@strong{10.} -Use the multi-line @code{INSERT} to reduce -communication overhead between the client and the server if you need -to insert many rows: - -@example -INSERT INTO yourtable VALUES (1, 2), (5, 5); -@end example - -This tip is of course valid for inserts into any table type, not just InnoDB. - -@node Innodb Monitor, , Innodb tuning, InnoDB transaction model -@subsubsection The InnoDB Monitor - -Starting from version 3.23.41 InnoDB includes the InnoDB -Monitor which prints information on the InnoDB internal state. -When switched on, InnoDB Monitor -will make the MySQL server @file{mysqld} to print data -(note: the MySQL client will not print anything) -to the standard -output about once every 15 seconds. This data is useful in -performance tuning. -On Windows you must start @code{mysqld-max} -from a MS-DOS prompt -with the @code{--standalone --console} -options to direct the output to the MS-DOS prompt -window. - -There is a separate @code{innodb_lock_monitor} which -prints the same information as @code{innodb_monitor} -plus information on locks set by each transaction. - -The printed information includes data on: -@itemize @bullet -@item -lock waits of a transactions, -@item -semaphore waits of threads, -@item -pending file I/O requests, -@item -buffer pool statistics, and -@item -purge and insert buffer merge activity of the main thread -of InnoDB. -@end itemize - -You can start InnoDB Monitor through the following -SQL command: - -@example -CREATE TABLE innodb_monitor(a int) type = innodb; -@end example - -and stop it by - -@example -DROP TABLE innodb_monitor; -@end example - -The @code{CREATE TABLE} syntax is just a way to pass a command -to the InnoDB engine through the MySQL SQL parser: the created -table is not relevant at all for InnoDB Monitor. If you shut down -the database when the monitor is running, and you want to start -the monitor again, you have to drop the -table before you can issue a new @code{CREATE TABLE} -to start the monitor. -This syntax may change in a future release. - - -A sample output of the InnoDB Monitor: - -@example -================================ -010809 18:45:06 INNODB MONITOR OUTPUT -================================ --------------------------- -LOCKS HELD BY TRANSACTIONS --------------------------- -LOCK INFO: -Number of locks in the record hash table 1294 -LOCKS FOR TRANSACTION ID 0 579342744 -TABLE LOCK table test/mytable trx id 0 582333343 lock_mode IX - -RECORD LOCKS space id 0 page no 12758 n bits 104 table test/mytable index -PRIMARY trx id 0 582333343 lock_mode X -Record lock, heap no 2 PHYSICAL RECORD: n_fields 74; 1-byte offs FALSE; -info bits 0 - 0: len 4; hex 0001a801; asc ;; 1: len 6; hex 000022b5b39f; asc ";; - 2: len 7; hex 000002001e03ec; asc ;; 3: len 4; hex 00000001; -... ------------------------------------------------ -CURRENT SEMAPHORES RESERVED AND SEMAPHORE WAITS ------------------------------------------------ -SYNC INFO: -Sorry, cannot give mutex list info in non-debug version! -Sorry, cannot give rw-lock list info in non-debug version! ------------------------------------------------------ -SYNC ARRAY INFO: reservation count 6041054, signal count 2913432 -4a239430 waited for by thread 49627477 op. S-LOCK file NOT KNOWN line 0 -Mut ex 0 sp 5530989 r 62038708 sys 2155035; -rws 0 8257574 8025336; rwx 0 1121090 1848344 ------------------------------------------------------ -CURRENT PENDING FILE I/O'S --------------------------- -Pending normal aio reads: -Reserved slot, messages 40157658 4a4a40b8 -Reserved slot, messages 40157658 4a477e28 -... -Reserved slot, messages 40157658 4a4424a8 -Reserved slot, messages 40157658 4a39ea38 -Total of 36 reserved aio slots -Pending aio writes: -Total of 0 reserved aio slots -Pending insert buffer aio reads: -Total of 0 reserved aio slots -Pending log writes or reads: -Reserved slot, messages 40158c98 40157f98 -Total of 1 reserved aio slots -Pending synchronous reads or writes: -Total of 0 reserved aio slots ------------ -BUFFER POOL ------------ -LRU list length 8034 -Free list length 0 -Flush list length 999 -Buffer pool size in pages 8192 -Pending reads 39 -Pending writes: LRU 0, flush list 0, single page 0 -Pages read 31383918, created 51310, written 2985115 ----------------------------- -END OF INNODB MONITOR OUTPUT -============================ -010809 18:45:22 InnoDB starts purge -010809 18:45:22 InnoDB purged 0 pages -@end example - -Some notes on the output: - -@itemize @bullet -@item -If the section LOCKS HELD -BY TRANSACTIONS reports lock waits, then your application -may have lock contention. The output can also help to -trace reasons for transaction deadlocks. -@item -Section SYNC INFO will report reserved semaphores -if you compile InnoDB with @code{UNIV_SYNC_DEBUG} -defined in @file{univ.i}. -@item -Section SYNC ARRAY INFO reports threads waiting -for a semaphore and statistics on how many times -threads have needed a spin or a wait on a mutex or -a rw-lock semaphore. A big number of threads waiting -for semaphores may be a result of disk I/O, or -contention problems inside InnoDB. Contention can be -due to heavy parallelism of queries, or problems in -operating system thread scheduling. -@item -Section CURRENT PENDING FILE I/O'S lists pending -file I/O requests. A large number of these indicates -that the workload is disk I/O-bound. -@item -Section BUFFER POOL gives you statistics -on pages read and written. You can calculate from these -numbers how many datafile I/Os your queries are -currently doing. -@end itemize - -@node Implementation, Table and index, InnoDB transaction model, InnoDB -@subsection Implementation of Multi-versioning - -Since InnoDB is a multi-versioned database, it must keep information -of old versions of rows in the tablespace. This information is stored -in a data structure we call a rollback segment after an analogous -data structure in Oracle. - -InnoDB internally adds two fields to each row stored in the database. -A 6-byte field tells the transaction identifier for the last -transaction which inserted or updated the row. Also a deletion -is internally treated as an update where a special bit in the row -is set to mark it as deleted. Each row also contains a 7-byte -field called the roll pointer. The roll pointer points to an -undo log record written to the rollback segment. If the row was -updated, then the undo log record contains the information necessary -to rebuild the content of the row before it was updated. - -InnoDB uses the information in the rollback segment to perform the -undo operations needed in a transaction rollback. It also uses the -information to build earlier versions of a row for a consistent -read. - -Undo logs in the rollback segment are divided into insert and update -undo logs. Insert undo logs are only needed in transaction rollback -and can be discarded as soon as the transaction commits. Update undo logs -are used also in consistent reads, and they can be discarded only after -there is no transaction present for which InnoDB has assigned -a snapshot that in a consistent read could need the information -in the update undo log to build an earlier version of a database -row. - -You must remember to commit your transactions regularly, -also those transactions which only issue consistent reads. -Otherwise -InnoDB cannot discard data from the update undo logs, and the -rollback segment may grow too big, filling up your tablespace. - -The physical size of an undo log record in the rollback segment -is typically smaller than the corresponding inserted or updated -row. You can use this information to calculate the space need -for your rollback segment. - -In our multi-versioning scheme a row is not physically removed from -the database immediately when you delete it with an SQL statement. -Only when InnoDB can discard the update undo log record written for -the deletion, it can also physically remove the corresponding row and -its index records from the database. This removal operation is -called a purge, and it is quite fast, usually taking the same order of -time as the SQL statement which did the deletion. - - -@node Table and index, File space management, Implementation, InnoDB -@subsection Table and Index Structures - -MySQL stores its data dictionary information of tables -in @file{.frm} -files in database directories. But every InnoDB type table -also has its own entry in InnoDB internal data dictionaries -inside the tablespace. When MySQL drops a table or a database, -it has to delete both a @file{.frm} file or files, and -the corresponding entries inside the InnoDB data dictionary. -This is the reason why you cannot move InnoDB tables between -databases simply by moving the @file{.frm} files, and why -@code{DROP DATABASE} did not work for InnoDB type tables -in MySQL versions <= 3.23.43. - -Every InnoDB table has a special index called the clustered index -where the data of the rows is stored. If you define a -@code{PRIMARY KEY} on your table, then the index of the primary key -will be the clustered index. - -If you do not define a primary key for -your table, InnoDB will internally generate a clustered index -where the rows are ordered by the row id InnoDB assigns -to the rows in such a table. The row id is a 6-byte field which -monotonically increases as new rows are inserted. Thus the rows -ordered by the row id will be physically in the insertion order. - -Accessing a row through the clustered index is fast, because -the row data will be on the same page where the index search -leads us. In many databases the data is traditionally stored on a different -page from the index record. If a table is large, the clustered -index architecture often saves a disk I/O when compared to the -traditional solution. - -The records in non-clustered indexes (we also call them secondary indexes), -in InnoDB contain the primary key value for the row. InnoDB -uses this primary key value to search for the row from the clustered -index. Note that if the primary key is long, the secondary indexes -will use more space. - -@menu -* InnoDB physical structure:: -* InnoDB Insert buffering:: -* InnoDB Adaptive hash:: -* InnoDB Physical record:: -@end menu - -@node InnoDB physical structure, InnoDB Insert buffering, Table and index, Table and index -@subsubsection Physical Structure of an Index - -All indexes in InnoDB are B-trees where the index records are -stored in the leaf pages of the tree. The default size of an index -page is 16 kB. When new records are inserted, InnoDB tries to -leave 1 / 16 of the page free for future insertions and updates -of the index records. - -If index records are inserted in a sequential (ascending or descending) -order, the resulting index pages will be about 15/16 full. -If records are inserted in a random order, then the pages will be -1/2 - 15/16 full. If the fillfactor of an index page drops below 1/2, -InnoDB will try to contract the index tree to free the page. - - -@node InnoDB Insert buffering, InnoDB Adaptive hash, InnoDB physical structure, Table and index -@subsubsection Insert Buffering - -It is a common situation in a database application that the -primary key is a unique identifier and new rows are inserted in the -ascending order of the primary key. Thus the insertions to the -clustered index do not require random reads from a disk. - -On the other hand, secondary indexes are usually non-unique and -insertions happen in a relatively random order into secondary indexes. -This would cause a lot of random disk I/Os without a special mechanism -used in InnoDB. - -If an index record should be inserted to a non-unique secondary index, -InnoDB checks if the secondary index page is already in the buffer -pool. If that is the case, InnoDB will do the insertion directly to -the index page. But, if the index page is not found from the buffer -pool, InnoDB inserts the record to a special insert buffer structure. -The insert buffer is kept so small that it entirely fits in the buffer -pool, and insertions can be made to it very fast. - -The insert buffer is periodically merged to the secondary index -trees in the database. Often we can merge several insertions on the -same page in of the index tree, and hence save disk I/Os. -It has been measured that the insert buffer can speed up insertions -to a table up to 15 times. - - -@node InnoDB Adaptive hash, InnoDB Physical record, InnoDB Insert buffering, Table and index -@subsubsection Adaptive Hash Indexes - -If a database fits almost entirely in main memory, then the fastest way -to perform queries on it is to use hash indexes. InnoDB has an -automatic mechanism which monitors index searches made to the indexes -defined for a table, and if InnoDB notices that queries could -benefit from building of a hash index, such an index is automatically -built. - -But note that the hash index is always built based on an existing -B-tree index on the table. InnoDB can build a hash index on a prefix -of any length of the key defined for the B-tree, depending on -what search pattern InnoDB observes on the B-tree index. -A hash index can be partial: it is not required that the whole -B-tree index is cached in the buffer pool. InnoDB will build -hash indexes on demand to those pages of the index which are -often accessed. - -In a sense, through the adaptive hash index mechanism InnoDB adapts itself -to ample main memory, coming closer to the architecture of main memory -databases. - - -@node InnoDB Physical record, , InnoDB Adaptive hash, Table and index -@subsubsection Physical Record Structure - -@itemize @bullet -@item -Each index record in InnoDB contains a header of 6 bytes. The header -is used to link consecutive records together, and also in the row level -locking. -@item -Records in the clustered index contain fields for all user-defined -columns. In addition, there is a 6-byte field for the transaction id -and a 7-byte field for the roll pointer. -@item -If the user has not defined a primary key for a table, then each clustered -index record contains also a 6-byte row id field. -@item -Each secondary index record contains also all the fields defined -for the clustered index key. -@item -A record contains also a pointer to each field of the record. -If the total length of the fields in a record is < 128 bytes, then -the pointer is 1 byte, else 2 bytes. -@end itemize - -@subsubsection How an Auto-increment Column Works in InnoDB - -After a database startup, when a user first does an insert to a -table @code{T} -where an auto-increment column has been defined, and the user does not provide -an explicit value for the column, then InnoDB executes @code{SELECT -MAX(auto-inc-column) FROM T}, and assigns that value incremented -by one to the column and the auto-increment counter of the table. -We say that -the auto-increment counter for table @code{T} has been initialised. - -InnoDB follows the same procedure in initializing the auto-increment counter -for a freshly created table. - -Note that if the user specifies in an insert the value 0 to the auto-increment -column, then InnoDB treats the row like the value would not have been -specified. - -After the auto-increment counter has been initialised, if a user inserts -a row where he explicitly specifies the column value, and the value is bigger -than the current counter value, then the counter is set to the specified -column value. If the user does not explicitly specify a value, then InnoDB -increments the counter by one and assigns its new value to the column. - -The auto-increment mechanism, when assigning values from the counter, -bypasses locking and transaction handling. Therefore you may also get -gaps in the number sequence if you roll back transactions which have -got numbers from the counter. - -The behaviour of auto-increment is not defined if a user gives a negative -value to the column or if the value becomes bigger than the maximum -integer that can be stored in the specified integer type. - - -@node File space management, Error handling, Table and index, InnoDB -@subsection File Space Management and Disk I/O - -@menu -* InnoDB Disk I/O:: Disk I/O -* InnoDB File space:: File Space Management -* InnoDB File Defragmenting:: Defragmenting a Table -@end menu - - -@node InnoDB Disk I/O, InnoDB File space, File space management, File space management -@subsubsection Disk I/O - -In disk I/O InnoDB uses asynchronous I/O. On Windows NT -it uses the native asynchronous I/O provided by the operating system. -On Unix, InnoDB uses simulated asynchronous I/O built -into InnoDB: InnoDB creates a number of I/O threads to take care -of I/O operations, such as read-ahead. In a future version we will -add support for simulated aio on Windows NT and native aio on those -versions of Unix which have one. - -On Windows NT InnoDB uses non-buffered I/O. That means that the disk -pages InnoDB reads or writes are not buffered in the operating system -file cache. This saves some memory bandwidth. - -Starting from 3.23.41 InnoDB uses a novel file flush technique -called doublewrite. -It adds safety to crash recovery after an operating system crash -or a power outage, and improves performance on most Unix flavors -by reducing the need for fsync operations. - -Doublewrite means that InnoDB before writing pages to a datafile -first writes them to a contiguous tablespace area called the -doublewrite buffer. Only after the write and the flush to the doublewrite -buffer has completed, InnoDB writes the pages to their proper -positions in the datafile. If the operating system crashes in the -middle of a page write, InnoDB will in recovery find a good -copy of the page from the doublewrite buffer. - -Starting from 3.23.41 -you can also use a raw disk partition as a datafile, though this has -not been tested yet. When you create a new datafile you have -to put the keyword @code{newraw} immediately after the data -file-size in @code{innodb_data_file_path}. The partition must be ->= than you specify as the size. Note that 1M in InnoDB is -1024 x 1024 bytes, while in disk specifications 1 MB usually means -1000 000 bytes. - -@example -innodb_data_file_path=hdd1:5Gnewraw;hdd2:2Gnewraw -@end example - -When you start the database again you @strong{must} change the keyword -to @code{raw}. Otherwise, InnoDB will write over your -partition! - -@example -innodb_data_file_path=hdd1:5Graw;hdd2:2Graw -@end example - -By using a raw disk you can on some Unixes perform unbuffered I/O. - -There are two read-ahead heuristics in InnoDB: sequential read-ahead -and random read-ahead. In sequential read-ahead InnoDB notices that -the access pattern to a segment in the tablespace is sequential. -Then InnoDB will post in advance a batch of reads of database pages to the -I/O system. In random read-ahead InnoDB notices that some area -in a tablespace seems to be in the process of being -fully read into the buffer pool. Then InnoDB posts the remaining -reads to the I/O system. - - -@node InnoDB File space, InnoDB File Defragmenting, InnoDB Disk I/O, File space management -@subsubsection File Space Management - -The datafiles you define in the configuration file form the tablespace -of InnoDB. The files are simply catenated to form the tablespace, -there is no striping in use. -Currently you cannot directly instruct where the space is allocated -for your tables, except by using the following fact: from a newly created -tablespace InnoDB will allocate space starting from the low end. - -The tablespace consists of database pages whose default size is 16 kB. -The pages are grouped into extents of 64 consecutive pages. The 'files' inside -a tablespace are called segments in InnoDB. The name of the rollback -segment is somewhat misleading because it actually contains many -segments in the tablespace. - -For each index in InnoDB we allocate two segments: one is for non-leaf -nodes of the B-tree, the other is for the leaf nodes. The idea here is -to achieve better sequentiality for the leaf nodes, which contain the -data. - -When a segment grows inside the tablespace, InnoDB allocates the -first 32 pages to it individually. After that InnoDB starts -to allocate whole extents to the segment. -InnoDB can add to a large segment up to 4 extents at a time to ensure -good sequentiality of data. - -Some pages in the tablespace contain bitmaps of other pages, and -therefore a few extents in an InnoDB tablespace cannot be -allocated to segments as a whole, but only as individual pages. - -When you issue a query @code{SHOW TABLE STATUS FROM ... LIKE ...} -to ask for available free space in the tablespace, InnoDB will -report the extents which are definitely free in the tablespace. -InnoDB always reserves some extents for clean-up and other internal -purposes; these reserved extents are not included in the free space. - -When you delete data from a table, InnoDB will contract the corresponding -B-tree indexes. It depends on the pattern of deletes if that frees -individual pages or extents to the tablespace, so that the freed -space is available for other users. Dropping a table or deleting -all rows from it is guaranteed to release the space to other users, -but remember that deleted rows can be physically removed only in a -purge operation after they are no longer needed in transaction rollback or -consistent read. - - -@node InnoDB File Defragmenting, , InnoDB File space, File space management -@subsubsection Defragmenting a Table - -If there are random insertions or deletions -in the indexes of a table, the indexes -may become fragmented. By fragmentation we mean that the physical ordering -of the index pages on the disk is not close to the alphabetical ordering -of the records on the pages, or that there are many unused pages in the -64-page blocks which were allocated to the index. - -It can speed up index scans if you -periodically use @code{mysqldump} to dump the table to -a text file, drop the table, and reload it from the dump. -Another way to do the defragmenting is to @code{ALTER} the table type to -@code{MyISAM} and back to @code{InnoDB} again. -Note that a @code{MyISAM} table must fit in a single file -on your operating system. - -If the insertions to and index are always ascending and -records are deleted only from the end, then the file space management -algorithm of InnoDB guarantees that fragmentation in the index will -not occur. - -@node Error handling, InnoDB restrictions, File space management, InnoDB -@subsection Error Handling - -The error handling in InnoDB is not always the same as -specified in the ANSI SQL standards. According to the ANSI -standard, any error during an SQL statement should cause the -rollback of that statement. InnoDB sometimes rolls back only -part of the statement, or the whole transaction. -The following list specifies the error handling of InnoDB. - -@itemize @bullet -@item -If you run out of file space in the tablespace, -you will get the MySQL @code{'Table is full'} error -and InnoDB rolls back the SQL statement. -@item -A transaction deadlock or a timeout in a lock wait make InnoDB -to roll back -the whole transaction. -@item -A duplicate key error only rolls back the insert of that particular row, -even in a statement like @code{INSERT INTO ... SELECT ...}. -This will probably change so that the SQL statement will be rolled -back if you have not specified the @code{IGNORE} option in your -statement. -@item -A 'row too long' error rolls back the SQL statement. -@item -Other errors are mostly detected by the MySQL layer of code, and -they roll back the corresponding SQL statement. -@end itemize - - -@node InnoDB restrictions, InnoDB change history, Error handling, InnoDB -@subsection Restrictions on InnoDB Tables - -@itemize @bullet - -@item -@strong{Warning}: do @strong{NOT} convert MySQL system tables from -MyISAM TO InnoDB tables! This is not supported; if you do this MySQL -will not restart until you restore the old system tables from a backup -or re-generate them with the @code{mysql_install_db} script. - -@item -@code{SHOW TABLE STATUS} does not give accurate statistics -on InnoDB tables, except for the physical size reserved by the table. -The row count is only a rough estimate used in SQL optimisation. - -@item -If you try to create a unique index on a prefix of a column you will get an -error: - -@example -CREATE TABLE T (A CHAR(20), B INT, UNIQUE (A(5))) TYPE = InnoDB; -@end example - -If you create a non-unique index on a prefix of a column, InnoDB will -create an index over the whole column. -@item -@code{INSERT DELAYED} is not supported for InnoDB tables. -@item -The MySQL @code{LOCK TABLES} operation does not know of InnoDB -row level locks set in already completed SQL statements: this means that -you can get a table lock on a table even if there still exist transactions -of other users which have row level locks on the same table. Thus -your operations on the table may have to wait if they collide with -these locks of other users. Also a deadlock is possible. However, -this does not endanger transaction integrity, because the row level -locks set by InnoDB will always take care of the integrity. -Also, a table lock prevents other transactions from acquiring more -row level locks (in a conflicting lock mode) on the table. -@item -You cannot have a key on a @code{BLOB} or @code{TEXT} column. -@item -A table cannot contain more than 1000 columns. -@item -@code{DELETE FROM TABLE} does not regenerate the table but instead -deletes all rows, one by one, which is not that fast. In future versions -of MySQL you can use @code{TRUNCATE} which is fast. -@item -The default database page size in InnoDB is 16 kB. By recompiling the -code one can set it from 8 kB to 64 kB. -The maximun row length is slightly less than half of a database page -in versions <= 3.23.40 of InnoDB. Starting from source -release 3.23.41 BLOB and -TEXT columns are allowed to be < 4 GB, the total row length must also be -< 4 GB. InnoDB does not store fields whose size is <= 128 bytes on separate -pages. After InnoDB has modified the row by storing long fields on -separate pages, the remaining length of the row must be less -than half a database page. The maximun key length is 7000 bytes. -@item -On some operating systems datafiles must be < 2 GB. The combined -size of log files must be < 4 GB. -@item -The maximum tablespace size is 4 billion database pages. This is also -the maximum size for a table. The minimum tablespace size is 10 MB. -@end itemize - -@node InnoDB change history, InnoDB contact information, InnoDB restrictions, InnoDB -@subsection InnoDB Change History - -@subsubsection MySQL/InnoDB-3.23.53, October xx, 2002 -@itemize bullet -@item -We again use unbuffered disk i/o in Windows. Win XP and Win 2000 -read performance seems to be very poor with normal i/o. -@item -Allow dropping and creating a table even if -innodb_force_recovery is set. One can use this to drop -a table which would cause a crash in rollback or purge, -or if a failed table import causes a runaway rollback in recovery. -@item -Fixed a bug: fast shutdown (which is the default) sometimes -was slowed down by purge and insert buffer merge. -@item -Fixed a bug: doing a big SELECT from a table where -no rows were visible in a consistent read could cause -a very long (> 600 seconds) semaphore wait in btr0cur.c line 310. -@end itemize - -@subsubsection MySQL/InnoDB-4.0.4, October 2, 2002 -@itemize bullet -@item -We again use unbuffered disk i/o in Windows. Win XP and Win 2000 -read performance seems to be very poor with normal i/o. -@item -Increased the max key length of InnoDB tables from 500 to 1024 bytes. -@item -Increased the table comment field in SHOW TABLE STATUS so that -up to 16000 characters of foreign key definitions can be printed there. -@item -The auto-increment counter is no longer incremented if -an insert of a row immediately fails in an error. -@item -Allow dropping and creating a table even if -innodb_force_recovery is set. One can use this to drop -a table which would cause a crash in rollback or purge, -or if a failed table import causes a runaway rollback in recovery. -@item -Fixed a bug: Using ORDER BY primarykey DESC in 4.0.3 causes -an assertion failure in btr0pcur.c, line 203. -@item -Fixed a bug: fast shutdown (which is the default) sometimes -was slowed down by purge and insert buffer merge. -@item -Fixed a bug: doing a big SELECT from a table where -no rows were visible in a consistent read could cause -a very long (> 600 seconds) semaphore wait in btr0cur.c line 310. -@item -Fixed a bug: if the MySQL query cache was used, it did not get -invalidated by a modification done by ON DELETE CASCADE or ...SET NULL. -@item -Fixed a bug: if you created a temporary table inside LOCK TABLES, -and used that temporary table, that caused an assertion failure -in ha_innodb.cc. -@item -Fixed a bug: if you set innodb_flush_log_at_trx_commit to 1, SHOW -VARIABLES would show its value as 16 million. -@end itemize - -@subsubsection MySQL/InnoDB-4.0.3, August 28, 2002 -@itemize bullet -@item -Removed unnecessary deadlocks when inserts have to wait for -a locking read, update, or delete to release its next-key lock. -@item -The MySQL HANDLER SQL commands now work also for InnoDB type tables. -InnoDB does the HANDLER reads always as consistent reads. -HANDLER is a direct access path to read individual indexes of tables. -In some cases HANDLER can be used as a substitute of server-side cursors. -@item -Fixed a bug in 4.0.2: even a simple insert could crash the -AIX version. -@item -Fixed a bug: if you used in a table name characters whose code is > 127, -in DROP TABLE InnoDB could assert on line 155 of pars0sym.c. -@item -Compilation from source now provides a working version both on -HP-UX-11 and HP-UX-10.20. The source of 4.0.2 worked only on 11, -and the source of 3.23.52 only on 10.20. -@item -Fixed a bug: if compiled on 64-bit Solaris, InnoDB produced a bus error -at startup. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.52, August 16, 2002 -@itemize bullet -@item -The feature set of 3.23 will be frozen from this version on. New features -will go the the 4.0 branch, and only bug fixes will be made to the 3.23 -branch. -@item -Many CPU-bound join queries now run faster. On Windows also many -other CPU-bound queries run faster. -@item -A new SQL command SHOW INNODB STATUS returns the output of the -InnoDB Monitor to the client. The InnoDB Monitor now prints detailed info on -the latest detected deadlock. -@item -InnoDB made the SQL query optimizer to avoid too much index-only -range scans and choose full table scans instead. This is now fixed. -@item -"BEGIN" and "COMMIT" are now added in the binlog around transactions. -The MySQL replication now respects transaction borders: -a user will no longer see half transactions in replication slaves. -@item -A replication slave now prints in crash recovery the last -master binlog position it was able to recover to. -@item -A new setting innodb_flush_log_at_trx_commit=2 makes InnoDB to write -the log to the operating system file cache at each commit. This is -almost as fast as the setting innodb_flush_log_at_trx_commit=0, and -the setting 2 also has the nice feature that in a crash where the -operating system does not crash, no committed transaction is lost. -If the operating system crashes or there is a power outage, then -the setting 2 is no safer than the setting 0. -@item -Added checksum fields to log blocks. -@item -SET FOREIGN_KEY_CHECKS=0 helps in importing tables -in an arbitrary order which does not respect the foreign key rules. -@item -SET UNIQUE_CHECKS=0 speeds up table imports into InnoDB -if you have UNIQUE constraints on secondary indexes. -@item -SHOW TABLE STATUS now lists also possible ON DELETE CASCADE or -ON DELETE SET NULL in the comment field of the table. -@item -When CHECK TABLE is run on any InnoDB type table, it now -checks also the adaptive hash index for all tables. -@item -If you defined ON DELETE CASCADE or SET NULL and updated the -referenced key in the parent row, InnoDB deleted or updated -the child row. This is now changed to conform to SQL-92: you get -the error 'Cannot delete parent row'. -@item -Improved the auto-increment algorithm: now the first insert or -SHOW TABLE STATUS initializes the auto-inc counter for the table. -This removes almost all surprising deadlocks caused by -SHOW TABLE STATUS. -@item -Aligned some buffers used in reading and writing to data files. -This allows using unbuffered raw devices as data files in Linux. -@item -Fixed a bug: If you updated the primary key of a table so that only the -case of characters changed, that could cause assertion -failures, mostly in page0page.ic line 515. -@item -Fixed a bug: If you delete or update a row referenced in a foreign key -constraint and the foreign key check has to wait for a lock, -then the check may report an erroneous result. This -affects also the ON DELETE... operation. -@item -Fixed a bug: A deadlock or a lock wait timeout error in InnoDB -causes InnoDB to roll back the whole transaction, but MySQL could still -write the earlier SQL statements to the binlog, even though -InnoDB rolled them back. This could, for example, cause replicated -databases to get out-of-sync. -@item -Fixed a bug: If the database happened to crash in the middle of a -commit, then the recovery might leak tablespace pages. -@item -Fixed a bug: If you specified a non-latin1 character set in my.cnf, -then, in contrary to what is stated in the manual, in a foreign key -constraint a string type column had to have the same length specification -in the referencing table and the referenced table. -@item -Fixed a bug: DROP TABLE or DROP DATABASE could fail if there -simultaneously was a CREATE TABLE running. -@item -Fixed a bug: If you configured the buffer pool bigger than 2 GB in -a 32-bit computer, InnoDB would assert in buf0buf.ic line 214. -@item -Fixed a bug: on 64-bit computers updating rows which contained the -SQL NULL in some column could cause the undo log and the ordinary -log to become corrupt. -@item -Fixed a bug: innodb_log_monitor caused a hang if it suppressed -lock prints for a page. -@item -Fixed a bug: in the HP-UX-10.20 version mutexes would leak and cause -race conditions and crashes in any part of InnoDB code. -@item -Fixed a bug: if you ran in the AUTOCOMMIT mode, executed a SELECT, -and immediately after that a RENAME TABLE, then RENAME would fail and -MySQL would complain about error 1192. -@item -Fixed a bug: if compiled on 64-bit Solaris, InnoDB produced a bus error -at startup. -@end itemize - -@subsubsection MySQL/InnoDB-4.0.2, July 10, 2002 -@itemize bullet -@item -InnoDB is essentially the same as InnoDB-3.23.51. -@item -If no innodb_data_file_path is specified, InnoDB at the database creation -now creates a 10 MB auto-extending data file ibdata1 to the datadir -of MySQL. In 4.0.1 the file was 64 MB and not auto-extending. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.51, June 12, 2002 -@itemize bullet -@item -Fixed a bug: a join could result in a seg fault in copying of a BLOB or -TEXT column if some of the BLOB or TEXT columns in the table contained -SQL NULL values. -@item -Fixed a bug: if you added self-referential foreign key constraints with -ON DELETE CASCADE to tables and a row deletion caused InnoDB -to attempt the deletion of the same row twice because of -a cascading delete, then you got an assertion failure. -@item -Fixed a bug: if you use MySQL 'user level locks' and close -a connection, then InnoDB may assert in ha_innobase.cc, line 302. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.50, April 23, 2002 -@itemize bullet -@item -InnoDB now supports an auto-extending last data file. You do not need -to preallocate the whole data file at the database startup. -@item -Made several changes to facilitate the use of the InnoDB Hot Backup -tool. It is a separate non-free tool you can use to take online backups -of your database without shutting down the server or setting -any locks. -@item -If you want to run the InnoDB Hot Backup tool on an auto-extending -data file you have to upgrade it to version ibbackup-0.35. -@item -The log scan phase in crash recovery will now run much faster. -@item -Starting from this server version, the hot backup tool -truncates unused ends in the backup InnoDB data files. -@item -To allow the hot backup tool to work, on Windows we no longer use -unbuffered i/o or native async i/o; instead we use the same simulated -async i/o as on Unix. -@item -You can now define the ON DELETE CASCADE or ON DELETE SET NULL -clause on foreign keys. -@item -FOREIGN KEY constraints now survive ALTER TABLE and CREATE -INDEX. -@item -We suppress the FOREIGN KEY check if any of the column values in the -foreign key or referenced key to be checked is the SQL NULL. This -is compatible with Oracle, for example. -@item -SHOW CREATE TABLE now lists also foreign key constraints. Also -mysqldump no longer forgets about foreign keys in table definitions. -@item -You can now add a new foreign key constraint with -ALTER TABLE ... ADD CONSTRAINT FOREIGN KEY (...) REFERENCES ... (...). -@item -FOREIGN KEY definitions now allow backquotes around table and -column names. -@item -MySQL command -SET TRANSACTION ISOLATION LEVEL ... -has now the following effect on -InnoDB tables: if a transaction is defined as SERIALIZABLE -then InnoDB conceptually adds LOCK IN SHARE MODE -to all consistent reads. If a transaction is defined to have any other -isolation level, then InnoDB obeys its default locking strategy -which is REPEATABLE READ. -@item -SHOW TABLE STATUS no longer sets an x-lock at the end of an -auto-increment index if the auto-increment counter has already -been initialized. This removes in almost all cases the surprising deadlocks -caused by SHOW TABLE STATUS. -@item -Fixed a bug: in a CREATE TABLE statement the string 'foreign' -followed by a non-space character confused the FOREIGN KEY parser -and caused table creation to fail with errno 150. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.49, February 17, 2002 -@itemize bullet -@item -Fixed a bug: if you called DROP DATABASE for a database on which -there simultaneously were running queries, the MySQL server could crash -or hang. Crashes fixed, but a full fix has to wait some changes -in the MySQL layer of code. -@item -Fixed a bug: on Windows one had to put the database name -in lower case for DROP -DATABASE to work. Fixed in 3.23.49: case no longer matters -on Windows. On Unix the database name remains case-sensitive. -@item -Fixed a bug: if one defined a non-latin1 character set as -the default character set, -then definition of foreign key constraints could fail -in an assertion failure -in dict0crea.c, reporting an internal error 17. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.48, February 9, 2002 -@itemize bullet -@item -Tuned the SQL optimizer to favor more often index searches -over table scans. -@item -Fixed a performance problem when several large SELECT -queries are run concurrently on a multiprocessor Linux computer. -Large CPU-bound SELECT queries will now also generally run faster on -all platforms. -@item -If MySQL binlogging is used, -InnoDB now prints after crash recovery the latest MySQL binlog -file name and the position in that file (= byte offset) -InnoDB was able to recover to. This is useful, for example, -when resynchronizing a master and a slave database in replication. -@item -Added better error messages to help in installation problems. -@item -One can now recover also MySQL temporary tables which have become -orphaned inside the InnoDB tablespace. -@item -InnoDB now prevents a FOREIGN KEY declaration where the signedness -is not the same in the referencing and referenced integer columns. -@item -Fixed a bug: calling SHOW CREATE TABLE or SHOW TABLE STATUS -could cause memory corruption and make mysqld to crash. -Especially at risk was mysqldump, because it calls frequently -SHOW CREATE TABLE. -@item -Fixed a bug: if on Unix you did an ALTER TABLE to an InnoDB table and -simultaneously did queries to it, mysqld could crash with an assertion -failure in row0row.c, line 474. -@item -Fixed a bug: if inserts to several tables containing an auto-inc column -were wrapped inside one LOCK TABLES, InnoDB asserted in lock0lock.c. -@item -In 3.23.47 we allowed several NULLS in a UNIQUE secondary index. -But CHECK TABLE was not relaxed: it reports the table as corrupt. -CHECK TABLE no longer complains in this situation. -@item -Fixed a bug: on Sparc and other high-endian processors SHOW VARIABLES -showed innodb_flush_log_at_trx_commit and other boolean-valued -startup parameters always OFF even if they were switched on. -@item -Fixed a bug: if you ran mysqld-max-nt as a service on Windows NT/2000, -the service shutdown did not always wait long enough for the InnoDB shutdown -to finish. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.47, December 28, 2001 -@itemize bullet -@item -Recovery happens now faster, especially in a lightly loaded system, -because background checkpointing has been made more frequent. -@item -InnoDB allows now several similar key values in a UNIQUE secondary index -if those values contain SQL NULLs. Thus the convention is now the same as in -MyISAM tables. -@item -InnoDB gives a better row count estimate for a table which contains BLOBs. -@item -In a FOREIGN KEY constraint InnoDB is now case-insensitive to column -names, and in Windows also to table names. -@item -InnoDB allows a FOREIGN KEY column of CHAR type to refer to a column of -VARCHAR type, and vice versa. MySQL silently changes the type of some -columns between CHAR and VARCHAR, and these silent changes do not hinder -FOREIGN KEY declaration any more. -@item -Recovery has been made more resilient to corruption of log files. -@item -Unnecessary statistics calculation has been removed from queries which -generate a temporary table. Some ORDER BY and DISTINCT queries will now run -much faster. -@item -MySQL now knows that the table scan of an InnoDB table is done through the -primary key. This will save a sort in some ORDER BY queries. -@item -The maximum key length of InnoDB tables is again restricted to 500 bytes. -The MySQL interpreter is not able to handle longer keys. -@item -The default value of innodb_lock_wait_timeout was changed from infinite to -50 seconds, the default value of innodb_file_io_threads from 9 -to 4. -@end itemize - -@subsubsection MySQL/InnoDB-4.0.1, December 23, 2001 -@itemize bullet -@item -InnoDB is the same as in 3.23.47. -@item -In 4.0.0 the MySQL interpreter did not know the syntax LOCK IN -SHARE MODE. This has been fixed. -@item -In 4.0.0 multi-table delete did not work for transactional tables. -This has been fixed. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.46, November 30, 2001 -@itemize bullet -@item -This is the same as 3.23.45. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.45, November 23, 2001 -@itemize bullet -@item -This is a bugfix release. -@item -In versions 3.23.42-.44 when creating a table on Windows you -have to use lower case letters in the database name to be able to -access the table. Fixed in 3.23.45. -@item -InnoDB now flushes stdout and stderr every 10 seconds: if these -are redirected to files, the file contents can be better viewed with -an editor. -@item -Fixed an assertion failure in .44, in trx0trx.c, line 178 -when you drop a table which has -the .frm file but does not exist inside InnoDB. -@item -Fixed a bug in the insert buffer. -The insert buffer tree could get into an inconsistent state, causing a crash, -and also crashing the recovery. This bug could appear especially in -large table imports or alterations. -@item -Fixed a bug in recovery: InnoDB could go into an infinite loop -constantly printing -a warning message that it cannot find free blocks from the buffer pool. -@item -Fixed a bug: when you created a temporary table of the InnoDB type, and then -used ALTER TABLE to it, the MySQL server could crash. -@item -Prevented creation of MySQL system tables 'mysql.user', -'mysql.host', or 'mysql.db', in the -InnoDB type. -@item -Fixed a bug which can cause an assertion failure in 3.23.44 in -srv0srv.c, line 1728. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.44, November 2, 2001 -@itemize bullet -@item -You can define foreign key constraints on InnoDB -tables. An example: FOREIGN KEY (col1) REFERENCES table2(col2). -@item -You can create > 4 GB data files in those -file systems that allow it. -@item -Improved InnoDB monitors, including a new innodb_table_monitor -which allows you to print the contents of the InnoDB internal data -dictionary. -@item -DROP DATABASE will now work also for InnoDB tables. -@item -Accent characters in the default character set -latin1 will be ordered according to the MySQL ordering.<br> -NOTE: if you are using latin1 and have inserted characters -whose code is > 127 to an indexed CHAR column, you should run -CHECK TABLE on your table when you upgrade to -3.23.43, and drop and reimport the table if CHECK TABLE -reports an error! -@item -InnoDB will calculate better table cardinality -estimates. -@item -Change in deadlock resolution: -in .43 a deadlock rolls back only the -SQL statement, in .44 it will roll back the whole transaction. -@item -Deadlock, lock wait timeout, and foreign key -constraint violations (no parent row, child rows exist) -now return native MySQL -error codes 1213, 1205, 1216, 1217, respectively. -@item -A new my.cnf parameter innodb_thread_concurrency -helps in performance tuning in high concurrency environments. -@item -A new my.cnf option innodb_force_recovery will -help you in dumping tables from a corrupted database. -@item -A new my.cnf option innodb_fast_shutdown will -speed up shutdown. Normally InnoDB does a full purge -and an insert buffer merge at shutdown. -@item -Raised maximum key length to 7000 bytes from a -previous limit of 500 bytes. -@item -Fixed a bug in replication of auto-inc columns with multiline inserts. -@item -Fixed a bug when the case of letters changes in an update of an indexed -secondary column. -@item -Fixed a hang when there are > 24 data files. -@item -Fixed a crash when MAX(col) is selected from an empty table, and col is a -not the first column in a multi-column index. -@item -Fixed a bug in purge which could cause crashes. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.43, October 4, 2001 -@itemize bullet -@item -This is essentially the same as InnoDB-3.23.42. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.42, September 9, 2001 -@itemize bullet -@item -Fixed a bug which corrupted the table if the primary key -of a > 8000-byte row was updated. -@item -There are now 3 types of InnoDB Monitors: innodb_monitor, -innodb_lock_monitor, and innodb_tablespace_monitor. -innodb_monitor now prints also buffer pool hit rate and the total -number of rows inserted, updated, deleted, read. -@item -Fixed a bug in RENAME TABLE. -@item -Fixed a bug in replication with an auto-increment column. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.41, August 13, 2001 -@itemize bullet -@item -Support for < 4 GB rows. The previous limit was -8000 bytes. -@item -Use the doublewrite file flush method. -@item -Raw disk partitions supported as data files. -@item -InnoDB Monitor. -@item -Several hang bugs fixed and an ORDER BY -bug ('Sort aborted') fixed. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.40, July 16, 2001 -@itemize bullet -@item -Only a few rare bugs fixed. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.39, June 13, 2001 -@itemize bullet -@item -CHECK TABLE now works for InnoDB tables. -@item -A new my.cnf parameter innodb_unix_file_flush_method -introduced. It can be used to tune disk write performance. -@item -An auto-increment column now gets new values past the -transaction mechanism. This saves CPU time and eliminates -transaction deadlocks in new value assignment. -@item -Several bug fixes, most notably the rollback bug in 3.23.38. -@end itemize - -@subsubsection MySQL/InnoDB-3.23.38, May 12, 2001 -@itemize bullet -@item -The new syntax SELECT ... LOCK IN SHARE MODE is introduced. -@item -InnoDB now calls fsync after every disk write and calculates -a checksum -for every database page it writes or reads, which will reveal disk defects. -@item -Several bug fixes. -@end itemize - -@node InnoDB contact information, , InnoDB change history, InnoDB -@subsection InnoDB Contact Information - -Contact information of Innobase Oy, producer of the InnoDB engine. -Web site: @uref{http://www.innodb.com/}. -E-mail: @email{Heikki.Tuuri@@innodb.com} - -@example -phone: 358-9-6969 3250 (office) 358-40-5617367 (mobile) -Innobase Oy Inc. -World Trade Center Helsinki -Aleksanterinkatu 17 -P.O.Box 800 -00101 Helsinki -Finland -@end example - - -@node BDB, , InnoDB, Table types -@section @code{BDB} or @code{BerkeleyDB} Tables - -@cindex tables, @code{BDB} -@cindex tables, @code{Berkeley DB} - -@menu -* BDB overview:: Overview of @code{BDB} Tables -* BDB install:: Installing @code{BDB} -* BDB start:: @code{BDB} startup options -* BDB characteristics:: Characteristics of @code{BDB} tables: -* BDB TODO:: Things we need to fix for @code{BDB} in the near future: -* BDB portability:: Operating systems supported by @code{BDB} -* BDB restrictions:: Restrictions on @code{BDB} Tables -* BDB errors:: Errors That May Occur When Using @code{BDB} Tables -@end menu - -@node BDB overview, BDB install, BDB, BDB -@subsection Overview of @code{BDB} Tables - -Support for @code{BDB} tables is included in the MySQL source distribution -starting from Version 3.23.34 and is activated in the MySQL-Max -binary. - -BerkeleyDB, available at @uref{http://www.sleepycat.com/} has provided -MySQL with a transactional table handler. By using BerkeleyDB -tables, your tables may have a greater chance of surviving crashes, and also -provides @code{COMMIT} and @code{ROLLBACK} on transactions. The -MySQL source distribution comes with a @code{BDB} distribution that has a -couple of small patches to make it work more smoothly with MySQL. -You can't use a non-patched @code{BDB} version with MySQL. - -We at MySQL AB are working in close cooperation with Sleepycat to -keep the quality of the MySQL/BDB interface high. - -When it comes to supporting @code{BDB} tables, we are committed to help our -users to locate the problem and help creating a reproducable test case -for any problems involving @code{BDB} tables. Any such test case will be -forwarded to Sleepycat who in turn will help us find and fix the -problem. As this is a two stage operation, any problems with @code{BDB} tables -may take a little longer for us to fix than for other table handlers. -However, as the BerkeleyDB code itself has been used by many other -applications than MySQL, we don't envision any big problems with -this. @xref{Support}. - - -@node BDB install, BDB start, BDB overview, BDB -@subsection Installing @code{BDB} - -If you have downloaded a binary version of MySQL that includes -support for BerkeleyDB, simply follow the instructions for installing a -binary version of MySQL. -@xref{Installing binary}. @xref{mysqld-max, , @code{mysqld-max}}. - -To compile MySQL with Berkeley DB support, download MySQL -Version 3.23.34 or newer and configure @code{MySQL} with the -@code{--with-berkeley-db} option. @xref{Installing source}. - -@example -cd /path/to/source/of/mysql-3.23.34 -./configure --with-berkeley-db -@end example - -Please refer to the manual provided with the @code{BDB} distribution for -more updated information. - -Even though Berkeley DB is in itself very tested and reliable, -the MySQL interface is still considered beta quality. -We are actively improving and optimising it to get it stable very -soon. - - -@node BDB start, BDB characteristics, BDB install, BDB -@subsection @code{BDB} startup options - -If you are running with @code{AUTOCOMMIT=0} then your changes in @code{BDB} -tables will not be updated until you execute @code{COMMIT}. Instead of commit -you can execute @code{ROLLBACK} to forget your changes. @xref{COMMIT}. - -If you are running with @code{AUTOCOMMIT=1} (the default), your changes -will be committed immediately. You can start an extended transaction with -the @code{BEGIN WORK} SQL command, after which your changes will not be -committed until you execute @code{COMMIT} (or decide to @code{ROLLBACK} -the changes). - -The following options to @code{mysqld} can be used to change the behaviour of -@code{BDB} tables: - -@multitable @columnfractions .25 .55 -@item @strong{Option} @tab @strong{Description} -@item @code{--bdb-home=directory} @tab Base directory for @code{BDB} tables. This should be the same directory you use for @code{--datadir}. -@item @code{--bdb-lock-detect=#} @tab Berkeley lock detect. One of (@code{DEFAULT}, @code{OLDEST}, @code{RANDOM}, or @code{YOUNGEST}). -@item @code{--bdb-logdir=directory} @tab Berkeley DB log file directory. -@item @code{--bdb-no-sync} @tab Don't synchronously flush logs. -@item @code{--bdb-no-recover} @tab Don't start Berkeley DB in recover mode. -@item @code{--bdb-shared-data} @tab Start Berkeley DB in multi-process mode (Don't use @code{DB_PRIVATE} when initialising Berkeley DB) -@item @code{--bdb-tmpdir=directory} @tab Berkeley DB temporary file directory. -@item @code{--skip-bdb} @tab Disable usage of @code{BDB} tables. -@item @code{-O bdb_max_lock=1000} @tab Set the maximum number of locks possible. @xref{SHOW VARIABLES}. -@end multitable - -If you use @code{--skip-bdb}, MySQL will not initialise the -Berkeley DB library and this will save a lot of memory. Of course, -you cannot use @code{BDB} tables if you are using this option. If you try -to create a @code{BDB} table, MySQL will instead create a @code{MyISAM} table. - -Normally you should start @code{mysqld} without @code{--bdb-no-recover} if you -intend to use @code{BDB} tables. This may, however, give you problems when you -try to start @code{mysqld} if the @code{BDB} log files are corrupted. @xref{Starting -server}. - -With @code{bdb_max_lock} you can specify the maximum number of locks -(10000 by default) you can have active on a @code{BDB} table. You should -increase this if you get errors of type @code{bdb: Lock table is out of -available locks} or @code{Got error 12 from ...} when you have do long -transactions or when @code{mysqld} has to examine a lot of rows to -calculate the query. - -You may also want to change @code{binlog_cache_size} and -@code{max_binlog_cache_size} if you are using big multi-line transactions. -@xref{COMMIT, , @code{COMMIT}}. - - -@node BDB characteristics, BDB TODO, BDB start, BDB -@subsection Characteristics of @code{BDB} tables: - -@itemize @bullet -@item -To be able to rollback transactions, the @code{BDB} handler maintains log -files. For maximum -performance you should place these on another disk than your databases -by using the @code{--bdb-logdir} option. -@item -MySQL performs a checkpoint each time a new @code{BDB} log -file is started, and removes any log files that are not needed for -current transactions. One can also run @code{FLUSH LOGS} at any time -to checkpoint the Berkeley DB tables. - -For disaster recovery, one should use table backups plus -MySQL's binary log. @xref{Backup}. - -@strong{Warning}: If you delete old log files that are in use, @code{BDB} will -not be able to do recovery at all and you may lose data if something -goes wrong. -@item -MySQL requires a @code{PRIMARY KEY} in each @code{BDB} table to be -able to refer to previously read rows. If you don't create one, -MySQL will create an maintain a hidden @code{PRIMARY KEY} for -you. The hidden key has a length of 5 bytes and is incremented for each -insert attempt. -@item -If all columns you access in a @code{BDB} table are part of the same index or -part of the primary key, then MySQL can execute the query -without having to access the actual row. In a @code{MyISAM} table the -above holds only if the columns are part of the same index. -@item -The @code{PRIMARY KEY} will be faster than any other key, as the -@code{PRIMARY KEY} is stored together with the row data. As the other keys are -stored as the key data + the @code{PRIMARY KEY}, it's important to keep the -@code{PRIMARY KEY} as short as possible to save disk and get better speed. -@item -@code{LOCK TABLES} works on @code{BDB} tables as with other tables. If -you don't use @code{LOCK TABLE}, MySQL will issue an internal -multiple-write lock on the table to ensure that the table will be -properly locked if another thread issues a table lock. -@item -Internal locking in @code{BDB} tables is done on page level. -@item -@code{SELECT COUNT(*) FROM table_name} is slow as @code{BDB} tables doesn't -maintain a count of the number of rows in the table. -@item -Scanning is slower than with @code{MyISAM} tables as one has data in -@code{BDB} -tables stored in B-trees and not in a separate datafile. -@item -The application must always be prepared to handle cases where -any change of a @code{BDB} table may make an automatic rollback and any -read may fail with a deadlock error. -@item -Keys are not compressed to previous keys as with @code{ISAM} or @code{MyISAM} -tables. In other words, the key information will take a little more -space in @code{BDB} tables compared to @code{MyISAM} tables which don't use -@code{PACK_KEYS=0}. -@item -There are often holes in the @code{BDB} table to allow you to insert new rows in -the middle of the key tree. This makes @code{BDB} tables somewhat larger than -@code{MyISAM} tables. -@item -The optimiser needs to know an approximation of the number of rows in -the table. MySQL solves this by counting inserts and -maintaining this in a separate segment in each @code{BDB} table. If you don't -issue a lot of @code{DELETE} or @code{ROLLBACK} statements, this number -should be accurate enough for the MySQL optimiser, but as MySQL -only stores the number on close, it may be incorrect if MySQL dies -unexpectedly. It should not be fatal even if this number is not 100% -correct. One can update the number of rows by executing @code{ANALYZE -TABLE} or @code{OPTIMIZE TABLE}. @xref{ANALYZE TABLE} . @xref{OPTIMIZE -TABLE}. -@item -If you get full disk with a @code{BDB} table, you will get an error -(probably error 28) and the transaction should roll back. This is in -contrast with @code{MyISAM} and @code{ISAM} tables where @code{mysqld} will -wait for enough free disk before continuing. -@end itemize - - -@node BDB TODO, BDB portability, BDB characteristics, BDB -@subsection Things we need to fix for @code{BDB} in the near future: - -@itemize @bullet -@item -It's very slow to open many @code{BDB} tables at the same time. If you are -going to use @code{BDB} tables, you should not have a very big table cache -(like >256) and you should use @code{--no-auto-rehash} with the @code{mysql} -client. We plan to partly fix this in 4.0. -@item -@code{SHOW TABLE STATUS} doesn't yet provide that much information for -@code{BDB} -tables. -@item -Optimise performance. -@item -Change to not use page locks at all when we are scanning tables. -@end itemize - - -@node BDB portability, BDB restrictions, BDB TODO, BDB -@subsection Operating systems supported by @code{BDB} - -If you after having built MySQL with support for @code{BDB} tables get -the following error in the log file when you start @code{mysqld}: - -@example -bdb: architecture lacks fast mutexes: applications cannot be threaded -Can't init dtabases -@end example - -This means that @code{BDB} tables are not supported for your architecture. -In this case you have to rebuild MySQL without @code{BDB} table support. - -Note: The following list is not complete; we will update it as we -receive more information about this. - -Currently we know that the @code{BDB} handler works with the following -operating systems: - -@itemize @bullet -@item -Linux 2.x intel -@item -Solaris SPARC -@item -Caldera (SCO) OpenServer -@item -Caldera (SCO) UnixWare 7.0.1 -@end itemize - -It doesn't work with the following operating systems: - -@itemize @bullet -@item -Linux 2.x Alpha -@item -Max OS X -@end itemize - -@node BDB restrictions, BDB errors, BDB portability, BDB -@subsection Restrictions on @code{BDB} Tables - -Here follows the restrictions you have when using @code{BDB} tables: - -@itemize @bullet -@item -@code{BDB} tables store in the @file{.db} file the path to the file as it was -created. -(This was done to be able to detect locks in a multi-user -environment that supports symlinks). - -The effect of this is that @code{BDB} tables are not movable between directories! -@item -When taking backups of @code{BDB} tables, you have to either use -@code{mysqldump} or take a backup of all @code{table_name.db} files and -the @code{BDB} log files. The @code{BDB} log files are the files in the base -data directory named @code{log.XXXXXXXXXX} (ten digits); -The @code{BDB} table handler stores unfinished transactions in the log files -and requires these to be present when @code{mysqld} starts. -@end itemize - -@node BDB errors, , BDB restrictions, BDB -@subsection Errors That May Occur When Using @code{BDB} Tables - -@itemize @bullet -@item -If you get the following error in the @code{hostname.err log} when -starting @code{mysqld}: - -@example -bdb: Ignoring log file: .../log.XXXXXXXXXX: unsupported log version # -@end example -it means that the new @code{BDB} version doesn't support the old log -file format. In this case you have to delete all @code{BDB} logs -from your database directory (the files with names that have the format -@code{log.XXXXXXXXXX}) and restart @code{mysqld}. We would also -recommend you to do a @code{mysqldump --opt} of your old @code{BDB} -tables, delete the old tables, and restore the dump. -@item -If you are not running in auto-commit mode and delete a table you -are using by another thread you may get the following error messages in -the MySQL error file: - -@example -001119 23:43:56 bdb: Missing log fileid entry -001119 23:43:56 bdb: txn_abort: Log undo failed for LSN: - 1 3644744: Invalid -@end example - -This is not fatal but we don't recommend that you delete tables if you are -not in auto-commit mode, until this problem is fixed (the fix is -not trivial). -@end itemize - - - - -@node Clients, Extending MySQL, Table types, Top -@chapter MySQL APIs - -@cindex client tools -@cindex APIs -@cindex @code{mysqlclient} library -@cindex buffer sizes, client -@cindex library, @code{mysqlclient} - -@menu -* PHP:: MySQL PHP API -* Perl:: MySQL Perl API -* ODBC:: MySQL ODBC Support -* C:: MySQL C API -* Cplusplus:: MySQL C++ APIs -* Java:: MySQL Java connectivity (JDBC) -* Python:: MySQL Python APIs -* Tcl:: MySQL Tcl APIs -* Eiffel:: MySQL Eiffel wrapper -@end menu - -This chapter describes the APIs available for MySQL, where to get -them, and how to use them. The C API is the most extensively covered, as it -was developed by the MySQL team, and is the basis for most of the -other APIs. - - -@node PHP, Perl, Clients, Clients -@section MySQL PHP API - -@cindex PHP API - -PHP is a server-side, HTML-embedded scripting language that may be used to -create dynamic web pages. It contains support for accessing several -databases, including MySQL. PHP may be run as a separate program -or compiled as a module for use with the Apache web server. - -The distribution and documentation are available at the PHP web site -(@uref{http://www.php.net/}). - -@menu -* PHP problems:: Common problems with MySQL and PHP -@end menu - -@node PHP problems, , PHP, PHP -@subsection Common Problems with MySQL and PHP - -@itemize @bullet -@item Error: "Maximum Execution Time Exceeded" -This is a PHP limit; go into the @file{php3.ini} file and set the maximum -execution time up from 30 seconds to something higher, as needed. -It is also not a bad idea to double the ram allowed per script to 16MB instead of -8 MB. -@item Error: "Fatal error: Call to unsupported or undefined function mysql_connect() in .." -This means that your PHP version isn't compiled with MySQL support. -You can either compile a dynamic MySQL module and load it into PHP or -recompile PHP with built-in MySQL support. This is described in -detail in the PHP manual. -@item Error: "undefined reference to `uncompress'" -This means that the client library is compiled with support for a compressed -client/server protocol. The fix is to add @code{-lz} last when linking -with @code{-lmysqlclient}. -@end itemize - - -@node Perl, ODBC, PHP, Clients -@section MySQL Perl API - -@cindex APIs, Perl -@cindex Perl API - -This section documents the Perl @code{DBI} interface. The former interface -was called @code{mysqlperl}. @code{DBI}/@code{DBD} now is the -recommended Perl interface, so @code{mysqlperl} is obsolete and is not -documented here. - -@menu -* DBI with DBD:: @code{DBI} with @code{DBD::mysql} -* Perl DBI Class:: The @code{DBI} interface -* DBI-info:: More @code{DBI}/@code{DBD} information -@end menu - - -@node DBI with DBD, Perl DBI Class, Perl, Perl -@subsection @code{DBI} with @code{DBD::mysql} - -@cindex @code{DBI} interface - -@code{DBI} is a generic interface for many databases. That means that -you can write a script that works with many different database engines -without change. You need a DataBase Driver (DBD) defined for each -database type. For MySQL, this driver is called -@code{DBD::mysql}. - -For more information on the Perl5 DBI, please visit the @code{DBI} web -page and read the documentation: -@example -@uref{http://dbi.perl.org/} -@end example -For more information on Object Oriented Programming -(OOP) as defined in Perl5, see the Perl OOP page: -@example -@uref{http://language.perl.com/info/documentation.html} -@end example - -Note that if you want to use transactions with Perl, you need to have -@code{Msql-Mysql-modules} version 1.2216 or newer. - -Installation instructions for MySQL Perl support are given in -@ref{Perl support}. - - -@node Perl DBI Class, DBI-info, DBI with DBD, Perl -@subsection The @code{DBI} Interface - -@cindex @code{DBI} Perl module - -@noindent -@strong{Portable DBI Methods} - -@multitable @columnfractions .25 .60 -@item @strong{Method} @tab @strong{Description} -@item @code{connect} @tab Establishes a connection to a database server. -@item @code{disconnect} @tab Disconnects from the database server. -@item @code{prepare} @tab Prepares a SQL statement for execution. -@item @code{execute} @tab Executes prepared statements. -@item @code{do} @tab Prepares and executes a SQL statement. -@item @code{quote} @tab Quotes string or @code{BLOB} values to be inserted. -@item @code{fetchrow_array} @tab Fetches the next row as an array of fields. -@item @code{fetchrow_arrayref} @tab Fetches next row as a reference array of fields. -@item @code{fetchrow_hashref} @tab Fetches next row as a reference to a hashtable. -@item @code{fetchall_arrayref} @tab Fetches all data as an array of arrays. -@item @code{finish} @tab Finishes a statement and lets the system free resources. -@item @code{rows} @tab Returns the number of rows affected. -@item @code{data_sources} @tab Returns an array of databases available on localhost. -@item @code{ChopBlanks} @tab Controls whether @code{fetchrow_*} methods trim spaces. -@item @code{NUM_OF_PARAMS} @tab The number of placeholders in the prepared statement. -@item @code{NULLABLE} @tab Which columns can be @code{NULL}. -@item @code{trace} @tab Perform tracing for debugging. -@end multitable - -@noindent -@strong{MySQL-specific Methods} - -@multitable @columnfractions .25 .60 -@item @strong{Method} @tab @strong{Description} -@item @code{insertid} @tab The latest @code{AUTO_INCREMENT} value. -@item @code{is_blob} @tab Which columns are @code{BLOB} values. -@item @code{is_key} @tab Which columns are keys. -@item @code{is_num} @tab Which columns are numeric. -@item @code{is_pri_key} @tab Which columns are primary keys. -@item @code{is_not_null} @tab Which columns CANNOT be @code{NULL}. See @code{NULLABLE}. -@item @code{length} @tab Maximum possible column sizes. -@item @code{max_length} @tab Maximum column sizes actually present in result. -@item @code{NAME} @tab Column names. -@item @code{NUM_OF_FIELDS} @tab Number of fields returned. -@item @code{table} @tab Table names in returned set. -@item @code{type} @tab All column types. -@end multitable - -The Perl methods are described in more detail in the following sections. -Variables used for method return values have these meanings: - -@table @code -@item $dbh -Database handle - -@item $sth -Statement handle - -@item $rc -Return code (often a status) - -@item $rv -Return value (often a row count) -@end table - -@noindent -@strong{Portable DBI Methods} - -@table @code - -@findex DBI->connect() -@findex connect() DBI method -@item connect($data_source, $username, $password) -Use the @code{connect} method to make a database connection to the data -source. The @code{$data_source} value should begin with -@code{DBI:driver_name:}. -Example uses of @code{connect} with the @code{DBD::mysql} driver: -@example -$dbh = DBI->connect("DBI:mysql:$database", $user, $password); -$dbh = DBI->connect("DBI:mysql:$database:$hostname", - $user, $password); -$dbh = DBI->connect("DBI:mysql:$database:$hostname:$port", - $user, $password); -@end example -If the user name and/or password are undefined, @code{DBI} uses the -values of the @code{DBI_USER} and @code{DBI_PASS} environment variables, -respectively. If you don't specify a hostname, it defaults to -@code{'localhost'}. If you don't specify a port number, it defaults to the -default MySQL port (@value{default_port}). - -As of @code{Msql-Mysql-modules} Version 1.2009, -the @code{$data_source} value allows certain modifiers: - -@table @code -@item mysql_read_default_file=file_name -Read @file{filename} as an option file. For information on option files, -see @ref{Option files}. - -@item mysql_read_default_group=group_name -The default group when reading an option file is normally the -@code{[client]} group. By specifying the @code{mysql_read_default_group} -option, the default group becomes the @code{[group_name]} group. - -@item mysql_compression=1 -Use compressed communication between the client and server (MySQL -Version 3.22.3 or later). - -@item mysql_socket=/path/to/socket -Specify the pathname of the Unix socket that is used to connect -to the server (MySQL Version 3.21.15 or later). -@end table - -Multiple modifiers may be given; each must be preceded by a semicolon. - -For example, if you want to avoid hardcoding the user name and password into -a @code{DBI} script, you can take them from the user's @file{~/.my.cnf} -option file instead by writing your @code{connect} call like this: - -@example -$dbh = DBI->connect("DBI:mysql:$database" - . ";mysql_read_default_file=$ENV@{HOME@}/.my.cnf", - $user, $password); -@end example - -This call will read options defined for the @code{[client]} group in the -option file. If you wanted to do the same thing but use options specified -for the @code{[perl]} group as well, you could use this: - -@example -$dbh = DBI->connect("DBI:mysql:$database" - . ";mysql_read_default_file=$ENV@{HOME@}/.my.cnf" - . ";mysql_read_default_group=perl", - $user, $password); -@end example - -@findex DBI->disconnect -@findex disconnect DBI method -@item disconnect -The @code{disconnect} method disconnects the database handle from the database. -This is typically called right before you exit from the program. -Example: -@example -$rc = $dbh->disconnect; -@end example - -@findex DBI->prepare() -@findex prepare() DBI method -@item prepare($statement) -Prepares a SQL statement for execution by the database engine -and returns a statement handle @code{($sth)}, which you can use to invoke -the @code{execute} method. -Typically you handle @code{SELECT} statements (and @code{SELECT}-like statements -such as @code{SHOW}, @code{DESCRIBE}, and @code{EXPLAIN}) by means of -@code{prepare} and @code{execute}. -Example: -@example -$sth = $dbh->prepare($statement) - or die "Can't prepare $statement: $dbh->errstr\n"; -@end example - -@findex DBI->execute -@findex execute DBI method -@item execute -The @code{execute} method executes a prepared statement. For -non-@code{SELECT} statements, @code{execute} returns the number of rows -affected. If no rows are affected, @code{execute} returns @code{"0E0"}, -which Perl treats as zero but regards as true. If an error occurs, -@code{execute} returns @code{undef}. For @code{SELECT} statements, -@code{execute} only starts the SQL query in the database; you need to use one -of the @code{fetch_*} methods described here to retrieve the data. -Example: -@example -$rv = $sth->execute - or die "can't execute the query: $sth->errstr; -@end example - -@findex DBI->do() -@findex do() DBI method -@item do($statement) -The @code{do} method prepares and executes a SQL statement and returns the -number of rows affected. If no rows are affected, @code{do} returns -@code{"0E0"}, which Perl treats as zero but regards as true. This method is -generally used for non-@code{SELECT} statements that cannot be prepared in -advance (due to driver limitations) or that do not need to be executed more -than once (inserts, deletes, etc.). Example: -@example -$rv = $dbh->do($statement) - or die "Can't execute $statement: $dbh- >errstr\n"; -@end example - -Generally the 'do' statement is much faster (and is preferable) -than prepare/execute for statements that don't contain parameters. - -@findex DBI->quote() -@findex quote() DBI method -@cindex quoting strings -@cindex strings, quoting -@item quote($string) -The @code{quote} method is used to "escape" any special characters contained in -the string and to add the required outer quotation marks. -Example: -@example -$sql = $dbh->quote($string) -@end example - -@findex DBI->fetchrow_array -@findex fetchrow_array DBI method -@item fetchrow_array -This method fetches the next row of data and returns it as an array of -field values. Example: -@example -while(@@row = $sth->fetchrow_array) @{ - print qw($row[0]\t$row[1]\t$row[2]\n); -@} -@end example - -@findex DBI->fetchrow_arrayref -@findex fetchrow_arrayref DBI method -@item fetchrow_arrayref -This method fetches the next row of data and returns it as a reference -to an array of field values. Example: -@example -while($row_ref = $sth->fetchrow_arrayref) @{ - print qw($row_ref->[0]\t$row_ref->[1]\t$row_ref->[2]\n); -@} -@end example - -@findex DBI->fetchrow_hashref -@findex fetchrow_hashref DBI method -@item fetchrow_hashref -This method fetches a row of data and returns a reference to a hash -table containing field name/value pairs. This method is not nearly as -efficient as using array references as demonstrated above. Example: -@example -while($hash_ref = $sth->fetchrow_hashref) @{ - print qw($hash_ref->@{firstname@}\t$hash_ref->@{lastname@}\t\ - $hash_ref- > title@}\n); -@} -@end example - -@findex DBI->fetchall_arrayref -@findex fetchall_arrayref DBI method -@item fetchall_arrayref -This method is used to get all the data (rows) to be returned from the -SQL statement. It returns a reference to an array of references to arrays -for each row. You access or print the data by using a nested -loop. Example: -@example -my $table = $sth->fetchall_arrayref - or die "$sth->errstr\n"; -my($i, $j); -for $i ( 0 .. $#@{$table@} ) @{ - for $j ( 0 .. $#@{$table->[$i]@} ) @{ - print "$table->[$i][$j]\t"; - @} - print "\n"; -@} -@end example - -@findex DBI->finish -@findex finish DBI method -@item finish -Indicates that no more data will be fetched from this statement -handle. You call this method to free up the statement handle and any -system resources associated with it. Example: -@example -$rc = $sth->finish; -@end example - -@findex DBI->rows -@findex rows DBI method -@item rows -Returns the number of rows changed (updated, deleted, etc.) by the last -command. This is usually used after a non-@code{SELECT} @code{execute} -statement. Example: -@example -$rv = $sth->rows; -@end example - -@findex DBI->@{NULLABLE@} -@findex NULLABLE DBI method -@item NULLABLE -Returns a reference to an array of values that indicate whether columns may -contain @code{NULL} values. -The possible values for each array element are 0 or the empty string if the -column cannot be @code{NULL}, 1 if it can, and 2 if the column's @code{NULL} -status is unknown. -Example: -@example -$null_possible = $sth->@{NULLABLE@}; -@end example - -@findex DBI->@{NUM_OF_FIELDS@} -@findex NUM_OF_FIELDS DBI method -@item NUM_OF_FIELDS -This attribute indicates -the number of fields returned by a @code{SELECT} or @code{SHOW FIELDS} -statement. You may use this for checking whether a statement returned a -result: A zero value indicates a non-@code{SELECT} statement like -@code{INSERT}, @code{DELETE}, or @code{UPDATE}. -Example: -@example -$nr_of_fields = $sth->@{NUM_OF_FIELDS@}; -@end example - -@findex DBI->data_sources() -@findex data_sources() DBI method -@item data_sources($driver_name) -This method returns an array containing names of databases available to the -MySQL server on the host @code{'localhost'}. -Example: -@example -@@dbs = DBI->data_sources("mysql"); -@end example - -@findex DBI->@{ChopBlanks@} -@findex ChopBlanks DBI method -@item ChopBlanks -This attribute determines whether the @code{fetchrow_*} methods will chop -leading and trailing blanks from the returned values. -Example: -@example -$sth->@{'ChopBlanks'@} =1; -@end example - -@findex DBI->trace -@findex trace DBI method -@item trace($trace_level) -@itemx trace($trace_level, $trace_filename) -The @code{trace} method enables or disables tracing. When invoked as a -@code{DBI} class method, it affects tracing for all handles. When invoked as -a database or statement handle method, it affects tracing for the given -handle (and any future children of the handle). Setting @code{$trace_level} -to 2 provides detailed trace information. Setting @code{$trace_level} to 0 -disables tracing. Trace output goes to the standard error output by -default. If @code{$trace_filename} is specified, the file is opened in -append mode and output for @strong{all} traced handles is written to that -file. Example: -@example -DBI->trace(2); # trace everything -DBI->trace(2,"/tmp/dbi.out"); # trace everything to - # /tmp/dbi.out -$dth->trace(2); # trace this database handle -$sth->trace(2); # trace this statement handle -@end example - -@tindex @code{DBI_TRACE} environment variable -@tindex environment variable, @code{DBI_TRACE} -You can also enable @code{DBI} tracing by setting the @code{DBI_TRACE} -environment variable. Setting it to a numeric value is equivalent to calling -@code{DBI->(value)}. Setting it to a pathname is equivalent to calling -@code{DBI->(2,value)}. - -@end table - -@noindent -@strong{MySQL-specific Methods} - -The methods shown here are MySQL-specific and not part of the -@code{DBI} standard. Several of them are now deprecated: -@code{is_blob}, @code{is_key}, @code{is_num}, @code{is_pri_key}, -@code{is_not_null}, @code{length}, @code{max_length}, and @code{table}. -Where @code{DBI}-standard alternatives exist, they are noted here: - -@table @code -@findex DBI->@{insertid@} -@findex insertid DBI method -@tindex AUTO_INCREMENT, using with DBI -@item insertid -If you use the @code{AUTO_INCREMENT} feature of MySQL, the new -auto-incremented values will be stored here. -Example: -@example -$new_id = $sth->@{insertid@}; -@end example - -As an alternative, you can use @code{$dbh->@{'mysql_insertid'@}}. - -@findex DBI->@{is_blob@} -@findex is_blob DBI method -@item is_blob -Returns a reference to an array of boolean values; for each element of the -array, a value of TRUE indicates that the -respective column is a @code{BLOB}. -Example: -@example -$keys = $sth->@{is_blob@}; -@end example - -@findex DBI->@{is_key@} -@findex is_key DBI method -@item is_key -Returns a reference to an array of boolean values; for each element of the -array, a value of TRUE indicates that the -respective column is a key. -Example: -@example -$keys = $sth->@{is_key@}; -@end example - -@findex DBI->@{is_num@} -@findex is_num DBI method -@item is_num -Returns a reference to an array of boolean values; for each element of the -array, a value of TRUE indicates that the -respective column contains numeric values. -Example: -@example -$nums = $sth->@{is_num@}; -@end example - -@findex DBI->@{is_pri_key@} -@findex is_pri_key DBI method -@item is_pri_key -Returns a reference to an array of boolean values; for each element of the -array, a value of TRUE indicates that the respective column is a primary key. -Example: -@example -$pri_keys = $sth->@{is_pri_key@}; -@end example - -@findex DBI->@{is_not_null@} -@findex is_not_null DBI method -@item is_not_null -Returns a reference to an array of boolean values; for each element of the -array, a value of FALSE indicates that this column may contain @code{NULL} -values. -Example: -@example -$not_nulls = $sth->@{is_not_null@}; -@end example - -@code{is_not_null} is deprecated; it is preferable to use the -@code{NULLABLE} attribute (described above), because that is a DBI standard. - -@findex DBI->@{length@} -@findex length DBI method -@findex DBI->@{max_length@} -@findex max_length DBI method -@item length -@itemx max_length -Each of these methods returns a reference to an array of column sizes. The -@code{length} array indicates the maximum possible sizes that each column may -be (as declared in the table description). The @code{max_length} array -indicates the maximum sizes actually present in the result table. Example: - -@example -$lengths = $sth->@{length@}; -$max_lengths = $sth->@{max_length@}; -@end example - -@findex DBI->@{NAME@} -@findex NAME DBI method -@item NAME -Returns a reference to an array of column names. -Example: -@example -$names = $sth->@{NAME@}; -@end example - -@findex DBI->@{table@} -@findex table DBI method -@item table -Returns a reference to an array of table names. -Example: -@example -$tables = $sth->@{table@}; -@end example - -@findex DBI->@{type@} -@findex type DBI method -@item type -Returns a reference to an array of column types. -Example: -@example -$types = $sth->@{type@}; -@end example - -@end table - - -@node DBI-info, , Perl DBI Class, Perl -@subsection More @code{DBI}/@code{DBD} Information - -@cindex @code{DBI/DBD} - -You can use the @code{perldoc} command to get more information about -@code{DBI}. - -@example -perldoc DBI -perldoc DBI::FAQ -perldoc DBD::mysql -@end example - -You can also use the @code{pod2man}, @code{pod2html}, etc., tools to -translate to other formats. - -You can find the latest @code{DBI} information at -the @code{DBI} web page: @uref{http://dbi.perl.org/}. - - -@node ODBC, C, Perl, Clients -@section MySQL ODBC Support - -@cindex ODBC -@cindex Windows -@cindex MyODBC - -@menu -* Installing MyODBC:: How to install MyODBC -* ODBC administrator:: How to fill in the various fields in the ODBC administrator program -* MyODBC connect parameters:: Connect parameters for MyODBC -* ODBC Problems:: How to report problems with MySQL ODBC -* MyODBC clients:: Programs known to work with @code{MyODBC} -* ODBC and last_insert_id:: How to get the value of an @code{AUTO_INCREMENT} column in ODBC -* MyODBC bug report:: Reporting problems with MyODBC -@end menu - - -MySQL provides support for ODBC by means of the @code{MyODBC} -program. This chapter will teach you how to install @code{MyODBC}, -and how to use it. Here, you will also find a list of common programs that -are known to work with @code{MyODBC}. - - -@node Installing MyODBC, ODBC administrator, ODBC, ODBC -@subsection How To Install MyODBC - -@code{MyODBC} is a 32-bit ODBC (2.50) level 0 (with level 1 and -level 2 features) driver for connecting an ODBC-aware application -to MySQL. @code{MyODBC} works on Windows 9x/Me/NT/2000/XP -and most Unix platforms. - -@code{MyODBC} is in public domain, and you can find the newest -version at @uref{http://www.mysql.com/downloads/api-myodbc.html}. - -If you have problem with @code{MyODBC} and your program also works -with OLEDB, you should try the OLEDB driver. - -Normally you only need to install @code{MyODBC} on Windows machines. -You only need @code{MyODBC} for Unix if you have a program like -ColdFusion that is running on the Unix machine and uses ODBC to connect -to the databases. - -If you want to install @code{MyODBC} on a Unix box, you will also need -an @code{ODBC} manager. @code{MyODBC} is known to work with -most of the Unix ODBC managers. @xref{Portals}. - -To install @code{MyODBC} on Windows, you should download the -appropriate @code{MyODBC} @file{.zip} file, -unpack it with @code{WinZIP} or some similar program, -and execute the @file{SETUP.EXE} file. - -On Windows/NT/XP you may get the following error when trying to install -@code{MyODBC}: - -@example -An error occurred while copying C:\WINDOWS\SYSTEM\MFC30.DLL. Restart -Windows and try installing again (before running any applications which -use ODBC) -@end example - -The problem in this case is that some other program is using ODBC and -because of how Windows is designed, you may not in this case be able to -install a new ODBC drivers with Microsoft's ODBC setup program. In most -cases you can continue by just pressing @code{Ignore} to copy the rest -of the MyODBC files and the final installation should still work. If -this doesn't work, the solution is to reboot your computer in ``safe -mode`` (Choose this by pressing F8 just before your machine starts -Windows during rebooting), install @code{MyODBC}, and reboot to normal -mode. - -@itemize @bullet -@item -To make a connection to a Unix box from a Windows box, with an ODBC -application (one that doesn't support MySQL natively), you must -first install @code{MyODBC} on the Windows machine. -@item -The user and Windows machine must have the access privileges to the -MySQL server on the Unix machine. This is set up with the -@code{GRANT} command. @xref{GRANT,,@code{GRANT}}. -@item -You must create an ODBC DSN entry as follows: - -@itemize @minus -@item -Open the Control Panel on the Windows machine. -@item -Double-click the ODBC Data Sources 32-bit icon. -@item -Click the tab User DSN. -@item -Click the button Add. -@item -Select MySQL in the screen Create New Data Source and click -the Finish button. -@item -The MySQL Driver default configuration screen is shown. -@xref{ODBC administrator}. -@end itemize - -@item -Now start your application and select the ODBC driver with the DSN you -specified in the ODBC administrator. -@end itemize - -Notice that there are other configuration options on the screen of -MySQL (trace, don't prompt on connect, etc) that you can try if -you run into problems. - - -@node ODBC administrator, MyODBC connect parameters, Installing MyODBC, ODBC -@subsection How to Fill in the Various Fields in the ODBC Administrator Program - -@cindex ODBC, administrator - -There are three possibilities for specifying the server name on -Windows95: - -@itemize @bullet -@item -Use the IP address of the server. -@item -Add a file @file{\windows\lmhosts} with the following information: - -@example -ip hostname -@end example - -For example: - -@example -194.216.84.21 my_hostname -@end example - -@item -Configure the PC to use DNS. -@end itemize - -Example of how to fill in the @code{ODBC setup}: -@example -Windows DSN name: test -Description: This is my test database -MySql Database: test -Server: 194.216.84.21 -User: monty -Password: my_password -Port: -@end example - -The value for the @code{Windows DSN name} field is any name that is unique -in your Windows ODBC setup. - -You don't have to specify values for the @code{Server}, @code{User}, -@code{Password}, or @code{Port} fields in the ODBC setup screen. -However, if you do, the values will be used as the defaults later when -you attempt to make a connection. You have the option of changing the -values at that time. - -If the port number is not given, the default port (@value{default_port}) -is used. - -If you specify the option @code{Read options from C:\my.cnf}, the groups -@code{client} and @code{odbc} will be read from the @file{C:\my.cnf} file. -You can use all options that are usable by @code{mysql_options()}. -@xref{mysql_options, , @code{mysql_options()}}. - - -@node MyODBC connect parameters, ODBC Problems, ODBC administrator, ODBC -@subsection Connect parameters for MyODBC - -One can specify the following parameters for @code{MyODBC} on -the @code{[Servername]} section of an @file{ODBC.INI} file or -through the @code{InConnectionString} argument in the -@code{SQLDriverConnect()} call. - -@multitable @columnfractions .15 .20 .65 -@item @strong{Parameter} @tab @strong{Default value} @tab @strong{Comment} -@item user @tab ODBC (on Windows) @tab The username used to connect to MySQL. -@item server @tab localhost @tab The hostname of the MySQL server. -@item database @tab @tab The default database. -@item option @tab 0 @tab A integer by which you can specify how @code{MyODBC} should work. See below. -@item port @tab 3306 @tab The TCP/IP port to use if @code{server} is not @code{localhost}. -@item stmt @tab @tab A statement that will be executed when connecting to @code{MySQL}. -@item password @tab @tab The password for the @code{server} @code{user} combination. -@item socket @tab @tab The socket or Windows pipe to connect to. -@end multitable - -The option argument is used to tell @code{MyODBC} that the client isn't 100% -ODBC compliant. On Windows, one normally sets the option flag by -toggling the different options on the connection screen but one can also -set this in the opton argument. The following options are listed in the -same order as they appear in the @code{MyODBC} connect screen: - -@multitable @columnfractions .10 .90 -@item @strong{Bit} @tab @strong{Description} -@item 1 @tab The client can't handle that @code{MyODBC} returns the real width of a column. -@item 2 @tab The client can't handle that MySQL returns the true value of affected rows. If this flag is set then MySQL returns 'found rows' instead. One must have MySQL 3.21.14 or newer to get this to work. -@item 4 @tab Make a debug log in c:\myodbc.log. This is the same as putting @code{MYSQL_DEBUG=d:t:O,c::\myodbc.log} in @file{AUTOEXEC.BAT} -@item 8 @tab Don't set any packet limit for results and parameters. -@item 16 @tab Don't prompt for questions even if driver would like to prompt -@item 32 @tab Simulate a ODBC 1.0 driver in some context. -@item 64 @tab Ignore use of database name in 'database.table.column'. -@item 128 @tab Force use of ODBC manager cursors (experimental). -@item 256 @tab Disable the use of extended fetch (experimental). -@item 512 @tab Pad CHAR fields to full column length. -@item 1024 @tab SQLDescribeCol() will return fully qualifed column names -@item 2048 @tab Use the compressed server/client protocol -@item 4096 @tab Tell server to ignore space after function name and before @code{'('} (needed by PowerBuilder). This will make all function names keywords! -@item 8192 @tab Connect with named pipes to a @code{mysqld} server running on NT. -@item 16384 @tab Change LONGLONG columns to INT columns (some applications can't handle LONGLONG). -@item 32768 @tab Return 'user' as Table_qualifier and Table_owner from SQLTables (experimental) -@item 65536 @tab Read parameters from the @code{client} and @code{odbc} groups from @file{my.cnf} -@item 131072 @tab Add some extra safety checks (should not bee needed but...) -@end multitable - -If you want to have many options, you should add the above flags! For -example setting option to 12 (4+8) gives you debugging without package -limits! - -The default @file{MYODBC.DLL} is compiled for optimal performance. If -you want to to debug @code{MyODBC} (for example to enable tracing), -you should instead use @file{MYODBCD.DLL}. To install this file, copy -@file{MYODBCD.DLL} over the installed @file{MYODBC.DLL} file. - - -@node ODBC Problems, MyODBC clients, MyODBC connect parameters, ODBC -@subsection How to Report Problems with MyODBC - -@code{MyODBC} has been tested with Access, Admndemo.exe, C++-Builder, -Borland Builder 4, Centura Team Developer (formerly Gupta SQL/Windows), -ColdFusion (on Solaris and NT with svc pack 5), Crystal Reports, -DataJunction, Delphi, ERwin, Excel, iHTML, FileMaker Pro, FoxPro, Notes -4.5/4.6, SBSS, Perl DBD-ODBC, Paradox, Powerbuilder, Powerdesigner 32 -bit, VC++, and Visual Basic. - -If you know of any other applications that work with @code{MyODBC}, please -send mail to @email{myodbc@@lists.mysql.com} about this! - -With some programs you may get an error like: -@code{Another user has modifies the record that you have modified}. In most -cases this can be solved by doing one of the following things: - -@itemize @bullet -@item -Add a primary key for the table if there isn't one already. -@item -Add a timestamp column if there isn't one already. -@item -Only use double float fields. Some programs may fail when they compare -single floats. -@end itemize - -If the above doesn't help, you should do a @code{MyODBC} trace file and -try to figure out why things go wrong. - - -@node MyODBC clients, ODBC and last_insert_id, ODBC Problems, ODBC -@subsection Programs Known to Work with MyODBC - -Most programs should work with @code{MyODBC}, but for each of those -listed here, we have tested it ourselves or received confirmation from -some user that it works: - -@table @asis -@item @strong{Program} -@strong{Comment} -@cindex Access program - -@item Access -To make Access work: -@itemize @bullet -@item -If you are using Access 2000, you should get and install the newest -(version 2.6 or above) Microsoft MDAC (@code{Microsoft Data Access -Components}) from @uref{http://www.microsoft.com/data/}. This will fix -the following bug in Access: when you export data to MySQL, the -table and column names aren't specified. Another way to around this bug -is to upgrade to MyODBC Version 2.50.33 and MySQL Version -3.23.x, which together provide a workaround for this bug! - -You should also get and apply the Microsoft Jet 4.0 Service Pack 5 (SP5) -which can be found here -@uref{http://support.microsoft.com/support/kb/articles/Q 239/1/14.ASP}. -This will fix some cases where columns are marked as @code{#deleted#} -in Access. - -Note that if you are using MySQL Version 3.22, you must to apply the -MDAC patch and use MyODBC 2.50.32 or 2.50.34 and above to go around -this problem. -@item -For all Access versions, you should enable the MyODBC option flag -@code{Return matching rows}. For Access 2.0, you should additionally enable -@code{Simulate ODBC 1.0}. -@item -You should have a timestamp in all tables you want to be able to update. -For maximum portability @code{TIMESTAMP(14)} or simple @code{TIMESTAMP} -is recommended instead of other @code{TIMESTAMP(X)} variations. -@item -You should have a primary key in the table. If not, new or updated rows -may show up as @code{#DELETED#}. -@item -Only use @code{DOUBLE} float fields. Access fails when comparing with -single floats. The symptom usually is that new or updated rows may show -up as @code{#DELETED#} or that you can't find or update rows. -@item -If you are linking a table through MyODBC, which has @code{BIGINT} as -one of the column, then the results will be displayed as @code{#DELETED}. The -work around solution is: -@itemize @bullet -@item -Have one more dummy column with @code{TIMESTAMP} as the data type, preferably -@code{TIMESTAMP(14)}. -@item -Check the @code{'Change BIGINT columns to INT'} in connection options dialog in -ODBC DSN Administrator -@item -Delete the table link from access and re-create it. -@end itemize - -It still displays the previous records as @code{#DELETED#}, but newly -added/updated records will be displayed properly. -@item -If you still get the error @code{Another user has changed your data} after -adding a @code{TIMESTAMP} column, the following trick may help you: - -Don't use @code{table} data sheet view. Create instead a form with the -fields you want, and use that @code{form} data sheet view. You should -set the @code{DefaultValue} property for the @code{TIMESTAMP} column to -@code{NOW()}. It may be a good idea to hide the @code{TIMESTAMP} column -from view so your users are not confused. -@item -In some cases, Access may generate illegal SQL queries that -MySQL can't understand. You can fix this by selecting -@code{"Query|SQLSpecific|Pass-Through"} from the Access menu. -@item -Access on NT will report @code{BLOB} columns as @code{OLE OBJECTS}. If -you want to have @code{MEMO} columns instead, you should change the -column to @code{TEXT} with @code{ALTER TABLE}. -@item -Access can't always handle @code{DATE} columns properly. If you have a problem -with these, change the columns to @code{DATETIME}. -@item -If you have in Access a column defined as @code{BYTE}, Access will try -to export this as @code{TINYINT} instead of @code{TINYINT UNSIGNED}. -This will give you problems if you have values > 127 in the column! -@end itemize - -@cindex ADO program -@item ADO -When you are coding with the ADO API and @code{MyODBC} you need to put -attention in some default properties that aren't supported by the -MySQL server. For example, using the @code{CursorLocation -Property} as @code{adUseServer} will return for the @code{RecordCount -Property} a result of -1. To have the right value, you need to set this -property to @code{adUseClient}, like is showing in the VB code here: - -@example -Dim myconn As New ADODB.Connection -Dim myrs As New Recordset -Dim mySQL As String -Dim myrows As Long - -myconn.Open "DSN=MyODBCsample" -mySQL = "SELECT * from user" -myrs.Source = mySQL -Set myrs.ActiveConnection = myconn -myrs.CursorLocation = adUseClient -myrs.Open -myrows = myrs.RecordCount - -myrs.Close -myconn.Close -@end example - -Another workaround is to use a @code{SELECT COUNT(*)} statement -for a similar query to get the correct row count. - -@item Active server pages (ASP) -You should use the option flag @code{Return matching rows}. - -@item BDE applications -To get these to work, you should set the option flags -@code{Don't optimize column widths} and @code{Return matching rows}. - -@cindex Borland Builder 4 program -@item Borland Builder 4 -When you start a query you can use the property @code{Active} or use the -method @code{Open}. Note that @code{Active} will start by automatically -issuing a @code{SELECT * FROM ...} query that may not be a good thing if -your tables are big! -@item ColdFusion (On Unix) -The following information is taken from the ColdFusion documentation: - -Use the following information to configure ColdFusion Server for Linux -to use the unixODBC driver with @code{MyODBC} for MySQL data -sources. Allaire has verified that @code{MyODBC} Version 2.50.26 -works with MySQL Version 3.22.27 and ColdFusion for Linux. (Any -newer version should also work.) You can download @code{MyODBC} at -@uref{http://www.mysql.com/downloads/api-myodbc.html} - -@cindex ColdFusion program -ColdFusion Version 4.5.1 allows you to us the ColdFusion Administrator -to add the MySQL data source. However, the driver is not -included with ColdFusion Version 4.5.1. Before the MySQL driver -will appear in the ODBC datasources drop-down list, you must build and -copy the @code{MyODBC} driver to -@file{/opt/coldfusion/lib/libmyodbc.so}. - -The Contrib directory contains the program @file{mydsn-xxx.zip} which allows -you to build and remove the DSN registry file for the MyODBC driver -on Coldfusion applications. - -@cindex DataJunction -@item DataJunction -You have to change it to output @code{VARCHAR} rather than @code{ENUM}, as -it exports the latter in a manner that causes MySQL grief. -@cindex Excel -@item Excel -Works. A few tips: -@itemize @bullet -@item -If you have problems with dates, try to select them as strings using the -@code{CONCAT()} function. For example: -@example -select CONCAT(rise_time), CONCAT(set_time) - from sunrise_sunset; -@end example -Values retrieved as strings this way should be correctly recognised -as time values by Excel97. - -The purpose of @code{CONCAT()} in this example is to fool ODBC into thinking -the column is of ``string type''. Without the @code{CONCAT()}, ODBC knows the -column is of time type, and Excel does not understand that. - -Note that this is a bug in Excel, because it automatically converts a -string to a time. This would be great if the source was a text file, but -is plain stupid when the source is an ODBC connection that reports -exact types for each column. -@end itemize -@cindex Word program -@item Word - -To retrieve data from MySQL to Word/Excel documents, you need to -use the @code{MyODBC} driver and the Add-in Microsoft Query help. - -For example, create a db with a table containing 2 columns of text: - -@itemize @bullet -@item -Insert rows using the @code{mysql} client command-line tool. -@item -Create a DSN file using the ODBC manager, for example, @file{my} for the db above. -@item -Open the Word application. -@item -Create a blank new documentation. -@item -Using the tool bar called Database, press the button insert database. -@item -Press the button Get Data. -@item -At the right hand of the screen Get Data, press the button Ms Query. -@item -In the Ms Query create a New Data Source using the DSN file my. -@item -Select the new query. -@item -Select the columns that you want. -@item -Make a filter if you want. -@item -Make a Sort if you want. -@item -Select Return Data to Microsoft Word. -@item -Click Finish. -@item -Click Insert data and select the records. -@item -Click OK and you see the rows in your Word document. -@end itemize - -@cindex odbcadmin program -@item odbcadmin -Test program for ODBC. -@cindex Delphi program -@item Delphi -You must use BDE Version 3.2 or newer. Set the @code{Don't optimize column width} -option field when connecting to MySQL. - -Also, here is some potentially useful Delphi code that sets up both an -ODBC entry and a BDE entry for @code{MyODBC} (the BDE entry requires a BDE -Alias Editor that is free at a Delphi Super Page near -you. (Thanks to Bryan Brunton @email{bryan@@flesherfab.com} for this): - -@example -fReg:= TRegistry.Create; - fReg.OpenKey('\Software\ODBC\ODBC.INI\DocumentsFab', True); - fReg.WriteString('Database', 'Documents'); - fReg.WriteString('Description', ' '); - fReg.WriteString('Driver', 'C:\WINNT\System32\myodbc.dll'); - fReg.WriteString('Flag', '1'); - fReg.WriteString('Password', ''); - fReg.WriteString('Port', ' '); - fReg.WriteString('Server', 'xmark'); - fReg.WriteString('User', 'winuser'); - fReg.OpenKey('\Software\ODBC\ODBC.INI\ODBC Data Sources', True); - fReg.WriteString('DocumentsFab', 'MySQL'); - fReg.CloseKey; - fReg.Free; - - Memo1.Lines.Add('DATABASE NAME='); - Memo1.Lines.Add('USER NAME='); - Memo1.Lines.Add('ODBC DSN=DocumentsFab'); - Memo1.Lines.Add('OPEN MODE=READ/WRITE'); - Memo1.Lines.Add('BATCH COUNT=200'); - Memo1.Lines.Add('LANGDRIVER='); - Memo1.Lines.Add('MAX ROWS=-1'); - Memo1.Lines.Add('SCHEMA CACHE DIR='); - Memo1.Lines.Add('SCHEMA CACHE SIZE=8'); - Memo1.Lines.Add('SCHEMA CACHE TIME=-1'); - Memo1.Lines.Add('SQLPASSTHRU MODE=SHARED AUTOCOMMIT'); - Memo1.Lines.Add('SQLQRYMODE='); - Memo1.Lines.Add('ENABLE SCHEMA CACHE=FALSE'); - Memo1.Lines.Add('ENABLE BCD=FALSE'); - Memo1.Lines.Add('ROWSET SIZE=20'); - Memo1.Lines.Add('BLOBS TO CACHE=64'); - Memo1.Lines.Add('BLOB SIZE=32'); - - AliasEditor.Add('DocumentsFab','MySQL',Memo1.Lines); -@end example - -@cindex C++ Builder -@item C++ Builder -Tested with BDE Version 3.0. The only known problem is that when the table -schema changes, query fields are not updated. BDE, however, does not seem -to recognise primary keys, only the index PRIMARY, though this has not -been a problem. - -@item Vision -You should use the option flag @code{Return matching rows}. - -@cindex Visual Basic -@item Visual Basic -To be able to update a table, you must define a primary key for the table. - -Visual Basic with ADO can't handle big integers. This means that some queries -like @code{SHOW PROCESSLIST} will not work properly. The fix is to set -add the option @code{OPTION=16834} in the ODBC connect string or set -the @code{Change BIGINT columns to INT} option in the MyODBC connect screen. -You may also want to set the @code{Return matching rows} option. - -@item VisualInterDev -If you get the error @code{[Microsoft][ODBC Driver Manager] Driver does -not support this parameter} the reason may be that you have a -@code{BIGINT} in your result. Try setting the @code{Change BIGINT -columns to INT} option in the MyODBC connect screen. - -@item Visual Objects -You should use the option flag @code{Don't optimize column widths}. -@end table - - -@node ODBC and last_insert_id, MyODBC bug report, MyODBC clients, ODBC -@subsection How to Get the Value of an @code{AUTO_INCREMENT} Column in ODBC - -@cindex AUTO-INCREMENT, ODBC - -A common problem is how to get the value of an automatically generated ID -from an @code{INSERT}. With ODBC, you can do something like this (assuming -that @code{auto} is an @code{AUTO_INCREMENT} field): - -@example -INSERT INTO foo (auto,text) VALUES(NULL,'text'); -SELECT LAST_INSERT_ID(); -@end example - -Or, if you are just going to insert the ID into another table, you can do this: - -@example -INSERT INTO foo (auto,text) VALUES(NULL,'text'); -INSERT INTO foo2 (id,text) VALUES(LAST_INSERT_ID(),'text'); -@end example - -@xref{Getting unique ID}. - -For the benefit of some ODBC applications (at least Delphi and Access), -the following query can be used to find a newly inserted row: -@example -SELECT * FROM tbl_name WHERE auto IS NULL; -@end example - - -@node MyODBC bug report, , ODBC and last_insert_id, ODBC -@subsection Reporting Problems with MyODBC - -@cindex reporting, MyODBC problems -@cindex problems, ODBC -@cindex MyODBC, reporting problems - -If you encounter difficulties with @code{MyODBC}, you should start by -making a log file from the ODBC manager (the log you get when requesting -logs from ODBCADMIN) and a @code{MyODBC} log. - -To get a @code{MyODBC} log, you need to do the following: - -@enumerate -@item -Ensure that you are using @file{myodbcd.dll} and not @file{myodbc.dll}. -The easiest way to do this is to get @file{myodbcd.dll} from the MyODBC -distribution and copy it over the @file{myodbc.dll}, which is probably -in your @file{C:\windows\system32} or @file{C:\winnt\system32} directory. - -Note that you probably want to restore the old myodbc.dll file when you -have finished testing, as this is a lot faster than @file{myodbcd.dll}. -@item -Tag the `Trace MyODBC' option flag in the @code{MyODBC} connect/configure -screen. The log will be written to file @file{C:\myodbc.log}. - -If the trace option is not remembered when you are going back to the -above screen, it means that you are not using the @code{myodbcd.dll} -driver (see the item above). -@item -Start your application and try to get it to fail. -@end enumerate - -Check the @code{MyODBC trace file}, to find out what could be wrong. -You should be able to find out the issued queries by searching after -the string @code{>mysql_real_query} in the @file{myodbc.log} file. - -You should also try duplicating the queries in the @code{mysql} monitor -or @code{admndemo} to find out if the error is MyODBC or MySQL. - -If you find out something is wrong, please only send the relevant rows -(max 40 rows) to @email{myodbc@@lists.mysql.com}. Please never -send the whole MyODBC or ODBC log file! - -If you are unable to find out what's wrong, the last option is to -make an archive (tar or zip) that contains a MyODBC trace file, the ODBC -log file, and a README file that explains the problem. You can send this -to @uref{ftp://support.mysql.com/pub/mysql/secret/}. Only we at -MySQL AB will have access to the files you upload, and we will -be very discrete with the data! - -If you can create a program that also shows this problem, please -upload this too! - -If the program works with some other SQL server, you should make an ODBC log -file where you do exactly the same thing in the other SQL server. - -Remember that the more information you can supply to us, the more -likely it is that we can fix the problem! - - -@node C, Cplusplus, ODBC, Clients -@section MySQL C API - -@cindex C API, datatypes -@cindex datatypes, C API - -@menu -* C API datatypes:: C API Datatypes -* C API function overview:: C API Function Overview -* C API functions:: C API Function Descriptions -* C Thread functions:: C Thread Functions -* C Embedded Server func:: C Embedded Server Function Descriptions -* C API problems:: Common questions and problems when using the C API -* Building clients:: Building Client Programs -* Threaded clients:: How to Make a Threaded Client -* libmysqld:: libmysqld, the Embedded MySQL Server Library -@end menu - -The C API code is distributed with MySQL. It is included in the -@code{mysqlclient} library and allows C programs to access a database. - -Many of the clients in the MySQL source distribution are -written in C. If you are looking for examples that demonstrate how to -use the C API, take a look at these clients. You can find these in the -@code{clients} directory in the MySQL source distribution. - -Most of the other client APIs (all except Java) use the @code{mysqlclient} -library to communicate with the MySQL server. This means that, for -example, you can take advantage of many of the same environment variables -that are used by other client programs, because they are referenced from the -library. See @ref{Client-Side Scripts}, for a list of these variables. - -The client has a maximum communication buffer size. The size of the buffer -that is allocated initially (16K bytes) is automatically increased up to the -maximum size (the maximum is 16M). Because buffer sizes are increased -only as demand warrants, simply increasing the default maximum limit does not -in itself cause more resources to be used. This size check is mostly a check -for erroneous queries and communication packets. - -The communication buffer must be large enough to contain a single SQL -statement (for client-to-server traffic) and one row of returned data (for -server-to-client traffic). Each thread's communication buffer is dynamically -enlarged to handle any query or row up to the maximum limit. For example, if -you have @code{BLOB} values that contain up to 16M of data, you must have a -communication buffer limit of at least 16M (in both server and client). The -client's default maximum is 16M, but the default maximum in the server is -1M. You can increase this by changing the value of the -@code{max_allowed_packet} parameter when the server is started. @xref{Server -parameters}. - -The MySQL server shrinks each communication buffer to -@code{net_buffer_length} bytes after each query. For clients, the size of -the buffer associated with a connection is not decreased until the connection -is closed, at which time client memory is reclaimed. - -For programming with threads, see @ref{Threaded clients}. -For creating a stand-alone application which includes the -"server" and "client" in the same program (and does not -communicate with an external MySQL server), see @ref{libmysqld}. - - -@node C API datatypes, C API function overview, C, C -@subsection C API Datatypes - -@table @code -@tindex MYSQL C type -@item MYSQL -This structure represents a handle to one database connection. It is -used for almost all MySQL functions. - -@tindex MYSQL_RES C type -@item MYSQL_RES -This structure represents the result of a query that returns rows -(@code{SELECT}, @code{SHOW}, @code{DESCRIBE}, @code{EXPLAIN}). The -information returned from a query is called the @emph{result set} in the -remainder of this section. - -@tindex MYSQL_ROW C type -@item MYSQL_ROW -This is a type-safe representation of one row of data. It is currently -implemented as an array of counted byte strings. (You cannot treat these as -null-terminated strings if field values may contain binary data, because such -values may contain null bytes internally.) Rows are obtained by calling -@code{mysql_fetch_row()}. - -@tindex MYSQL_FIELD C type -@item MYSQL_FIELD -This structure contains information about a field, such as the field's -name, type, and size. Its members are described in more detail here. -You may obtain the @code{MYSQL_FIELD} structures for each field by -calling @code{mysql_fetch_field()} repeatedly. Field values are not part of -this structure; they are contained in a @code{MYSQL_ROW} structure. - - -@tindex MYSQL_FIELD_OFFSET C type -@item MYSQL_FIELD_OFFSET -This is a type-safe representation of an offset into a MySQL field -list. (Used by @code{mysql_field_seek()}.) Offsets are field numbers -within a row, beginning at zero. - -@tindex my_ulonglong C type -@tindex my_ulonglong values, printing -@item my_ulonglong -The type used for the number of rows and for @code{mysql_affected_rows()}, -@code{mysql_num_rows()}, and @code{mysql_insert_id()}. This type provides a -range of @code{0} to @code{1.84e19}. - -On some systems, attempting to print a value of type @code{my_ulonglong} -will not work. To print such a value, convert it to @code{unsigned long} -and use a @code{%lu} print format. Example: -@example -printf (Number of rows: %lu\n", (unsigned long) mysql_num_rows(result)); -@end example -@end table - -@noindent -The @code{MYSQL_FIELD} structure contains the members listed here: - -@table @code -@item char * name -The name of the field, as a null-terminated string. - -@item char * table -The name of the table containing this field, if it isn't a calculated field. -For calculated fields, the @code{table} value is an empty string. - -@item char * def -The default value of this field, as a null-terminated string. This is set -only if you use @code{mysql_list_fields()}. - -@item enum enum_field_types type -The type of the field. -The @code{type} value may be one of the following: - -@multitable @columnfractions .35 .55 -@item @strong{Type value} @tab @strong{Type description} -@item @code{FIELD_TYPE_TINY} @tab @code{TINYINT} field -@item @code{FIELD_TYPE_SHORT} @tab @code{SMALLINT} field -@item @code{FIELD_TYPE_LONG} @tab @code{INTEGER} field -@item @code{FIELD_TYPE_INT24} @tab @code{MEDIUMINT} field -@item @code{FIELD_TYPE_LONGLONG} @tab @code{BIGINT} field -@item @code{FIELD_TYPE_DECIMAL} @tab @code{DECIMAL} or @code{NUMERIC} field -@item @code{FIELD_TYPE_FLOAT} @tab @code{FLOAT} field -@item @code{FIELD_TYPE_DOUBLE} @tab @code{DOUBLE} or @code{REAL} field -@item @code{FIELD_TYPE_TIMESTAMP} @tab @code{TIMESTAMP} field -@item @code{FIELD_TYPE_DATE} @tab @code{DATE} field -@item @code{FIELD_TYPE_TIME} @tab @code{TIME} field -@item @code{FIELD_TYPE_DATETIME} @tab @code{DATETIME} field -@item @code{FIELD_TYPE_YEAR} @tab @code{YEAR} field -@item @code{FIELD_TYPE_STRING} @tab String (@code{CHAR} or @code{VARCHAR}) field -@item @code{FIELD_TYPE_BLOB} @tab @code{BLOB} or @code{TEXT} field (use @code{max_length} to determine the maximum length) -@item @code{FIELD_TYPE_SET} @tab @code{SET} field -@item @code{FIELD_TYPE_ENUM} @tab @code{ENUM} field -@item @code{FIELD_TYPE_NULL} @tab @code{NULL}-type field -@item @code{FIELD_TYPE_CHAR} @tab Deprecated; use @code{FIELD_TYPE_TINY} instead -@end multitable - -You can use the @code{IS_NUM()} macro to test whether a field has a -numeric type. Pass the @code{type} value to @code{IS_NUM()} and it -will evaluate to TRUE if the field is numeric: - -@example -if (IS_NUM(field->type)) - printf("Field is numeric\n"); -@end example - -@item unsigned int length -The width of the field, as specified in the table definition. - -@item unsigned int max_length -The maximum width of the field for the result set (the length of the longest -field value for the rows actually in the result set). If you use -@code{mysql_store_result()} or @code{mysql_list_fields()}, this contains the -maximum length for the field. If you use @code{mysql_use_result()}, the -value of this variable is zero. - -@item unsigned int flags -Different bit-flags for the field. The @code{flags} value may have zero -or more of the following bits set: - -@multitable @columnfractions .35 .55 -@item @strong{Flag value} @tab @strong{Flag description} -@item @code{NOT_NULL_FLAG} @tab Field can't be @code{NULL} -@item @code{PRI_KEY_FLAG} @tab Field is part of a primary key -@item @code{UNIQUE_KEY_FLAG} @tab Field is part of a unique key -@item @code{MULTIPLE_KEY_FLAG} @tab Field is part of a non-unique key -@item @code{UNSIGNED_FLAG} @tab Field has the @code{UNSIGNED} attribute -@item @code{ZEROFILL_FLAG} @tab Field has the @code{ZEROFILL} attribute -@item @code{BINARY_FLAG} @tab Field has the @code{BINARY} attribute -@item @code{AUTO_INCREMENT_FLAG} @tab Field has the @code{AUTO_INCREMENT} -attribute -@item @code{ENUM_FLAG} @tab Field is an @code{ENUM} (deprecated) -@item @code{SET_FLAG} @tab Field is a @code{SET} (deprecated) -@item @code{BLOB_FLAG} @tab Field is a @code{BLOB} or @code{TEXT} (deprecated) -@item @code{TIMESTAMP_FLAG} @tab Field is a @code{TIMESTAMP} (deprecated) -@end multitable - -Use of the @code{BLOB_FLAG}, @code{ENUM_FLAG}, @code{SET_FLAG}, and -@code{TIMESTAMP_FLAG} flags is deprecated because they indicate the type of -a field rather than an attribute of its type. It is preferable to test -@code{field->type} against @code{FIELD_TYPE_BLOB}, @code{FIELD_TYPE_ENUM}, -@code{FIELD_TYPE_SET}, or @code{FIELD_TYPE_TIMESTAMP} instead. - -@noindent -The following example illustrates a typical use of the @code{flags} value: - -@example -if (field->flags & NOT_NULL_FLAG) - printf("Field can't be null\n"); -@end example - -You may use the following convenience macros to determine the boolean -status of the @code{flags} value: - -@multitable @columnfractions .25 .55 -@item @strong{Flag status} @tab @strong{Description} -@item @code{IS_NOT_NULL(flags)} @tab True if this field is defined as @code{NOT NULL} -@item @code{IS_PRI_KEY(flags)} @tab True if this field is a primary key -@item @code{IS_BLOB(flags)} @tab True if this field is a @code{BLOB} or @code{TEXT} (deprecated; test @code{field->type} instead) -@end multitable - -@item unsigned int decimals -The number of decimals for numeric fields. -@end table - - -@node C API function overview, C API functions, C API datatypes, C -@subsection C API Function Overview - -@cindex C API, functions -@cindex functions, C API - -The functions available in the C API are listed here and are described in -greater detail in a later section. -@xref{C API functions}. - -@multitable @columnfractions .32 .68 -@item @strong{Function} @tab @strong{Description} - -@item @strong{mysql_affected_rows()} @tab -Returns the number of rows changed/deleted/inserted by the last @code{UPDATE}, -@code{DELETE}, or @code{INSERT} query. - -@item @strong{mysql_change_user()} @tab -Changes user and database on an open connection. - -@item @strong{mysql_character_set_name()} @tab -Returns the name of the default character set for the connection. - -@item @strong{mysql_close()} @tab -Closes a server connection. - -@item @strong{mysql_connect()} @tab -Connects to a MySQL server. This function is deprecated; use -@code{mysql_real_connect()} instead. - -@item @strong{mysql_create_db()} @tab -Creates a database. This function is deprecated; use the SQL command -@code{CREATE DATABASE} instead. - -@item @strong{mysql_data_seek()} @tab -Seeks to an arbitrary row in a query result set. - -@item @strong{mysql_debug()} @tab -Does a @code{DBUG_PUSH} with the given string. - -@item @strong{mysql_drop_db()} @tab -Drops a database. This function is deprecated; use the SQL command -@code{DROP DATABASE} instead. - -@item @strong{mysql_dump_debug_info()} @tab -Makes the server write debug information to the log. - -@item @strong{mysql_eof()} @tab -Determines whether the last row of a result set has been read. -This function is deprecated; @code{mysql_errno()} or @code{mysql_error()} -may be used instead. - -@item @strong{mysql_errno()} @tab -Returns the error number for the most recently invoked MySQL function. - -@item @strong{mysql_error()} @tab -Returns the error message for the most recently invoked MySQL function. - -@item @strong{mysql_escape_string()} @tab -Escapes special characters in a string for use in a SQL statement. - -@item @strong{mysql_fetch_field()} @tab -Returns the type of the next table field. - -@item @strong{mysql_fetch_field_direct()} @tab -Returns the type of a table field, given a field number. - -@item @strong{mysql_fetch_fields()} @tab -Returns an array of all field structures. - -@item @strong{mysql_fetch_lengths()} @tab -Returns the lengths of all columns in the current row. - -@item @strong{mysql_fetch_row()} @tab -Fetches the next row from the result set. - -@item @strong{mysql_field_seek()} @tab -Puts the column cursor on a specified column. - -@item @strong{mysql_field_count()} @tab -Returns the number of result columns for the most recent query. - -@item @strong{mysql_field_tell()} @tab -Returns the position of the field cursor used for the last -@code{mysql_fetch_field()}. - -@item @strong{mysql_free_result()} @tab -Frees memory used by a result set. - -@item @strong{mysql_get_client_info()} @tab -Returns client version information. - -@item @strong{mysql_get_host_info()} @tab -Returns a string describing the connection. - -@item @strong{mysql_get_proto_info()} @tab -Returns the protocol version used by the connection. - -@item @strong{mysql_get_server_info()} @tab -Returns the server version number. - -@item @strong{mysql_info()} @tab -Returns information about the most recently executed query. - -@item @strong{mysql_init()} @tab -Gets or initialises a @code{MYSQL} structure. - -@item @strong{mysql_insert_id()} @tab -Returns the ID generated for an @code{AUTO_INCREMENT} column by the previous -query. - -@item @strong{mysql_kill()} @tab -Kills a given thread. - -@item @strong{mysql_list_dbs()} @tab -Returns database names matching a simple regular expression. - -@item @strong{mysql_list_fields()} @tab -Returns field names matching a simple regular expression. - -@item @strong{mysql_list_processes()} @tab -Returns a list of the current server threads. - -@item @strong{mysql_list_tables()} @tab -Returns table names matching a simple regular expression. - -@item @strong{mysql_num_fields()} @tab -Returns the number of columns in a result set. - -@item @strong{mysql_num_rows()} @tab -Returns the number of rows in a result set. - -@item @strong{mysql_options()} @tab -Sets connect options for @code{mysql_connect()}. - -@item @strong{mysql_ping()} @tab -Checks whether the connection to the server is working, reconnecting -as necessary. - -@item @strong{mysql_query()} @tab -Executes a SQL query specified as a null-terminated string. - -@item @strong{mysql_real_connect()} @tab -Connects to a MySQL server. - -@item @strong{mysql_real_escape_string()} @tab -Escapes special characters in a string for use in a SQL statement, taking -into account the current charset of the connection. - -@item @strong{mysql_real_query()} @tab -Executes a SQL query specified as a counted string. - -@item @strong{mysql_reload()} @tab -Tells the server to reload the grant tables. - -@item @strong{mysql_row_seek()} @tab -Seeks to a row in a result set, using value returned from -@code{mysql_row_tell()}. - -@item @strong{mysql_row_tell()} @tab -Returns the row cursor position. - -@item @strong{mysql_select_db()} @tab -Selects a database. - -@item @strong{mysql_shutdown()} @tab -Shuts down the database server. - -@item @strong{mysql_stat()} @tab -Returns the server status as a string. - -@item @strong{mysql_store_result()} @tab -Retrieves a complete result set to the client. - -@item @strong{mysql_thread_id()} @tab -Returns the current thread ID. - -@item @strong{mysql_thread_safe()} @tab -Returns 1 if the clients are compiled as thread-safe. - -@item @strong{mysql_use_result()} @tab -Initiates a row-by-row result set retrieval. -@end multitable - -To connect to the server, call @code{mysql_init()} to initialise a -connection handler, then call @code{mysql_real_connect()} with that -handler (along with other information such as the hostname, user name, -and password). Upon connection, @code{mysql_real_connect()} sets the -@code{reconnect} flag (part of the MYSQL structure) to a value of -@code{1}. This flag indicates, in the event that a query cannot be -performed because of a lost connection, to try reconnecting to the -server before giving up. When you are done with the connection, call -@code{mysql_close()} to terminate it. - -While a connection is active, the client may send SQL queries to the server -using @code{mysql_query()} or @code{mysql_real_query()}. The difference -between the two is that @code{mysql_query()} expects the query to be -specified as a null-terminated string whereas @code{mysql_real_query()} -expects a counted string. If the string contains binary data (which may -include null bytes), you must use @code{mysql_real_query()}. - -For each non-@code{SELECT} query (for example, @code{INSERT}, @code{UPDATE}, -@code{DELETE}), you can find out how many rows were changed (affected) -by calling @code{mysql_affected_rows()}. - -For @code{SELECT} queries, you retrieve the selected rows as a result set. -(Note that some statements are @code{SELECT}-like in that they return rows. -These include @code{SHOW}, @code{DESCRIBE}, and @code{EXPLAIN}. They should -be treated the same way as @code{SELECT} statements.) - -There are two ways for a client to process result sets. One way is to -retrieve the entire result set all at once by calling -@code{mysql_store_result()}. This function acquires from the server all the -rows returned by the query and stores them in the client. The second way is -for the client to initiate a row-by-row result set retrieval by calling -@code{mysql_use_result()}. This function initialises the retrieval, but does -not actually get any rows from the server. - -In both cases, you access rows by calling @code{mysql_fetch_row()}. With -@code{mysql_store_result()}, @code{mysql_fetch_row()} accesses rows that have -already been fetched from the server. With @code{mysql_use_result()}, -@code{mysql_fetch_row()} actually retrieves the row from the server. -Information about the size of the data in each row is available by -calling @code{mysql_fetch_lengths()}. - -After you are done with a result set, call @code{mysql_free_result()} -to free the memory used for it. - -The two retrieval mechanisms are complementary. Client programs should -choose the approach that is most appropriate for their requirements. -In practice, clients tend to use @code{mysql_store_result()} more -commonly. - -An advantage of @code{mysql_store_result()} is that because the rows have all -been fetched to the client, you not only can access rows sequentially, you -can move back and forth in the result set using @code{mysql_data_seek()} or -@code{mysql_row_seek()} to change the current row position within the result -set. You can also find out how many rows there are by calling -@code{mysql_num_rows()}. On the other hand, the memory requirements for -@code{mysql_store_result()} may be very high for large result sets and you -are more likely to encounter out-of-memory conditions. - -An advantage of @code{mysql_use_result()} is that the client requires less -memory for the result set because it maintains only one row at a time (and -because there is less allocation overhead, @code{mysql_use_result()} can be -faster). Disadvantages are that you must process each row quickly to avoid -tying up the server, you don't have random access to rows within the result -set (you can only access rows sequentially), and you don't know how many rows -are in the result set until you have retrieved them all. Furthermore, you -@strong{must} retrieve all the rows even if you determine in mid-retrieval that -you've found the information you were looking for. - -The API makes it possible for clients to respond appropriately to -queries (retrieving rows only as necessary) without knowing whether or -not the query is a @code{SELECT}. You can do this by calling -@code{mysql_store_result()} after each @code{mysql_query()} (or -@code{mysql_real_query()}). If the result set call succeeds, the query -was a @code{SELECT} and you can read the rows. If the result set call -fails, call @code{mysql_field_count()} to determine whether a -result was actually to be expected. If @code{mysql_field_count()} -returns zero, the query returned no data (indicating that it was an -@code{INSERT}, @code{UPDATE}, @code{DELETE}, etc.), and was not -expected to return rows. If @code{mysql_field_count()} is non-zero, the -query should have returned rows, but didn't. This indicates that the -query was a @code{SELECT} that failed. See the description for -@code{mysql_field_count()} for an example of how this can be done. - -Both @code{mysql_store_result()} and @code{mysql_use_result()} allow you to -obtain information about the fields that make up the result set (the number -of fields, their names and types, etc.). You can access field information -sequentially within the row by calling @code{mysql_fetch_field()} repeatedly, -or by field number within the row by calling -@code{mysql_fetch_field_direct()}. The current field cursor position may be -changed by calling @code{mysql_field_seek()}. Setting the field cursor -affects subsequent calls to @code{mysql_fetch_field()}. You can also get -information for fields all at once by calling @code{mysql_fetch_fields()}. - -For detecting and reporting errors, MySQL provides access to error -information by means of the @code{mysql_errno()} and @code{mysql_error()} -functions. These return the error code or error message for the most -recently invoked function that can succeed or fail, allowing you to determine -when an error occurred and what it was. - - -@node C API functions, C Thread functions, C API function overview, C -@subsection C API Function Descriptions - -@menu -* mysql_affected_rows:: @code{mysql_affected_rows()} -* mysql_change_user:: @code{mysql_change_user()} -* mysql_character_set_name:: @code{mysql_character_set_name()} -* mysql_close:: @code{mysql_close()} -* mysql_connect:: @code{mysql_connect()} -* mysql_create_db:: @code{mysql_create_db()} -* mysql_data_seek:: @code{mysql_data_seek()} -* mysql_debug:: @code{mysql_debug()} -* mysql_drop_db:: @code{mysql_drop_db()} -* mysql_dump_debug_info:: @code{mysql_dump_debug_info()} -* mysql_eof:: @code{mysql_eof()} -* mysql_errno:: @code{mysql_errno()} -* mysql_error:: @code{mysql_error()} -* mysql_escape_string:: @code{mysql_escape_string()} -* mysql_fetch_field:: @code{mysql_fetch_field()} -* mysql_fetch_fields:: @code{mysql_fetch_fields()} -* mysql_fetch_field_direct:: @code{mysql_fetch_field_direct()} -* mysql_fetch_lengths:: @code{mysql_fetch_lengths()} -* mysql_fetch_row:: @code{mysql_fetch_row()} -* mysql_field_count:: @code{mysql_field_count()} -* mysql_field_seek:: @code{mysql_field_seek()} -* mysql_field_tell:: @code{mysql_field_tell()} -* mysql_free_result:: @code{mysql_free_result()} -* mysql_get_client_info:: @code{mysql_get_client_info()} -* mysql_get_host_info:: @code{mysql_get_host_info()} -* mysql_get_proto_info:: @code{mysql_get_proto_info()} -* mysql_get_server_info:: @code{mysql_get_server_info()} -* mysql_info:: @code{mysql_info()} -* mysql_init:: @code{mysql_init()} -* mysql_insert_id:: @code{mysql_insert_id()} -* mysql_kill:: @code{mysql_kill()} -* mysql_list_dbs:: @code{mysql_list_dbs()} -* mysql_list_fields:: @code{mysql_list_fields()} -* mysql_list_processes:: @code{mysql_list_processes()} -* mysql_list_tables:: @code{mysql_list_tables()} -* mysql_num_fields:: @code{mysql_num_fields()} -* mysql_num_rows:: @code{mysql_num_rows()} -* mysql_options:: @code{mysql_options()} -* mysql_ping:: @code{mysql_ping()} -* mysql_query:: @code{mysql_query()} -* mysql_real_connect:: @code{mysql_real_connect()} -* mysql_real_escape_string:: @code{mysql_real_escape_string()} -* mysql_real_query:: @code{mysql_real_query()} -* mysql_reload:: @code{mysql_reload()} -* mysql_row_seek:: @code{mysql_row_seek()} -* mysql_row_tell:: @code{mysql_row_tell()} -* mysql_select_db:: @code{mysql_select_db()} -* mysql_shutdown:: @code{mysql_shutdown()} -* mysql_stat:: @code{mysql_stat()} -* mysql_store_result:: @code{mysql_store_result()} -* mysql_thread_id:: @code{mysql_thread_id()} -* mysql_use_result:: @code{mysql_use_result()} -@end menu - -In the descriptions here, a parameter or return value of @code{NULL} means -@code{NULL} in the sense of the C programming language, not a -MySQL @code{NULL} value. - -Functions that return a value generally return a pointer or an integer. -Unless specified otherwise, functions returning a pointer return a -non-@code{NULL} value to indicate success or a @code{NULL} value to indicate -an error, and functions returning an integer return zero to indicate success -or non-zero to indicate an error. Note that ``non-zero'' means just that. -Unless the function description says otherwise, do not test against a value -other than zero: - -@example -if (result) /* correct */ - ... error ... - -if (result < 0) /* incorrect */ - ... error ... - -if (result == -1) /* incorrect */ - ... error ... -@end example - -When a function returns an error, the @strong{Errors} subsection of the -function description lists the possible types of errors. You can -find out which of these occurred by calling @code{mysql_errno()}. -A string representation of the error may be obtained by calling -@code{mysql_error()}. - - -@node mysql_affected_rows, mysql_change_user, C API functions, C API functions -@subsubsection @code{mysql_affected_rows()} - -@findex @code{mysql_affected_rows()} - -@code{my_ulonglong mysql_affected_rows(MYSQL *mysql)} - -@subsubheading Description - -Returns the number of rows changed by the last @code{UPDATE}, deleted by -the last @code{DELETE} or inserted by the last @code{INSERT} -statement. May be called immediately after @code{mysql_query()} for -@code{UPDATE}, @code{DELETE}, or @code{INSERT} statements. For -@code{SELECT} statements, @code{mysql_affected_rows()} works like -@code{mysql_num_rows()}. - -@subsubheading Return Values - -An integer greater than zero indicates the number of rows affected or -retrieved. Zero indicates that no records where updated for an -@code{UPDATE} statement, no rows matched the @code{WHERE} clause in the -query or that no query has yet been executed. -1 indicates that the -query returned an error or that, for a @code{SELECT} query, -@code{mysql_affected_rows()} was called prior to calling -@code{mysql_store_result()}. - -@subsubheading Errors - -None. - -@subsubheading Example - -@example -mysql_query(&mysql,"UPDATE products SET cost=cost*1.25 WHERE group=10"); -printf("%ld products updated",(long) mysql_affected_rows(&mysql)); -@end example - -If one specifies the flag @code{CLIENT_FOUND_ROWS} when connecting to -@code{mysqld}, @code{mysql_affected_rows()} will return the number of -rows matched by the @code{WHERE} statement for @code{UPDATE} statements. - -Note that when one uses a @code{REPLACE} command, -@code{mysql_affected_rows()} will return 2 if the new row replaced and -old row. This is because in this case one row was inserted and then the -duplicate was deleted. - - -@node mysql_change_user, mysql_character_set_name, mysql_affected_rows, C API functions -@subsubsection @code{mysql_change_user()} - -@findex @code{mysql_change_user()} - -@code{my_bool mysql_change_user(MYSQL *mysql, const char *user, const -char *password, const char *db)} - -@subsubheading Description - -Changes the user and causes the database specified by @code{db} to -become the default (current) database on the connection specified by -@code{mysql}. In subsequent queries, this database is the default for -table references that do not include an explicit database specifier. - -This function was introduced in MySQL Version 3.23.3. - -@code{mysql_change_user()} fails unless the connected user can be -authenticated or if he doesn't have permission to use the database. In -this case the user and database are not changed - -The @code{db} parameter may be set to @code{NULL} if you don't want to have a -default database. - -@subsubheading Return Values - -Zero for success. Non-zero if an error occurred. - -@subsubheading Errors - -The same that you can get from @code{mysql_real_connect()}. - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@item ER_UNKNOWN_COM_ERROR -The MySQL server doesn't implement this command (probably an old server) -@item ER_ACCESS_DENIED_ERROR -The user or password was wrong. -@item ER_BAD_DB_ERROR -The database didn't exist. -@item ER_DBACCESS_DENIED_ERROR -The user did not have access rights to the database. -@item ER_WRONG_DB_NAME -The database name was too long. -@end table - -@subsubheading Example - -@example -if (mysql_change_user(&mysql, "user", "password", "new_database")) -@{ - fprintf(stderr, "Failed to change user. Error: %s\n", - mysql_error(&mysql)); -@} -@end example - - -@node mysql_character_set_name, mysql_close, mysql_change_user, C API functions -@subsubsection @code{mysql_character_set_name()} - -@findex @code{mysql_character_set_name()} - -@code{const char *mysql_character_set_name(MYSQL *mysql)} - -@subsubheading Description - -Returns the default character set for the current connection. - -@subsubheading Return Values - -The default character set - -@subsubheading Errors -None. - - -@node mysql_close, mysql_connect, mysql_character_set_name, C API functions -@subsubsection @code{mysql_close()} - -@findex @code{mysql_close()} - -@code{void mysql_close(MYSQL *mysql)} - -@subsubheading Description -Closes a previously opened connection. @code{mysql_close()} also deallocates -the connection handle pointed to by @code{mysql} if the handle was allocated -automatically by @code{mysql_init()} or @code{mysql_connect()}. - -@subsubheading Return Values - -None. - -@subsubheading Errors - -None. - - -@node mysql_connect, mysql_create_db, mysql_close, C API functions -@subsubsection @code{mysql_connect()} - -@findex @code{mysql_connect()} - -@code{MYSQL *mysql_connect(MYSQL *mysql, const char *host, const char *user, const char *passwd)} - -@subsubheading Description - -This function is deprecated. It is preferable to use -@code{mysql_real_connect()} instead. - -@code{mysql_connect()} attempts to establish a connection to a MySQL -database engine running on @code{host}. @code{mysql_connect()} must complete -successfully before you can execute any of the other API functions, with the -exception of @code{mysql_get_client_info()}. - -The meanings of the parameters are the same as for the corresponding -parameters for @code{mysql_real_connect()} with the difference that the -connection parameter may be @code{NULL}. In this case the C API -allocates memory for the connection structure automatically and frees it -when you call @code{mysql_close()}. The disadvantage of this approach is -that you can't retrieve an error message if the connection fails. (To -get error information from @code{mysql_errno()} or @code{mysql_error()}, -you must provide a valid @code{MYSQL} pointer.) - -@subsubheading Return Values - -Same as for @code{mysql_real_connect()}. - -@subsubheading Errors - -Same as for @code{mysql_real_connect()}. - - -@node mysql_create_db, mysql_data_seek, mysql_connect, C API functions -@subsubsection @code{mysql_create_db()} - -@findex @code{mysql_create_db()} - -@code{int mysql_create_db(MYSQL *mysql, const char *db)} - -@subsubheading Description -Creates the database named by the @code{db} parameter. - -This function is deprecated. It is preferable to use @code{mysql_query()} -to issue a SQL @code{CREATE DATABASE} statement instead. - -@subsubheading Return Values - -Zero if the database was created successfully. Non-zero if an error -occurred. - -@subsubheading Errors -@table @code - -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. - -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. - -@item CR_SERVER_LOST -The connection to the server was lost during the query. - -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - -@subsubheading Example - -@example -if(mysql_create_db(&mysql, "my_database")) -@{ - fprintf(stderr, "Failed to create new database. Error: %s\n", - mysql_error(&mysql)); -@} -@end example - - -@node mysql_data_seek, mysql_debug, mysql_create_db, C API functions -@subsubsection @code{mysql_data_seek()} - -@findex @code{mysql_data_seek()} - -@code{void mysql_data_seek(MYSQL_RES *result, my_ulonglong offset)} - -@subsubheading Description -Seeks to an arbitrary row in a query result set. This requires that the -result set structure contains the entire result of the query, so -@code{mysql_data_seek()} may be used in conjunction only with -@code{mysql_store_result()}, not with @code{mysql_use_result()}. - -The offset should be a value in the range from 0 to -@code{mysql_num_rows(result)-1}. - -@subsubheading Return Values - -None. - -@subsubheading Errors -None. - - -@node mysql_debug, mysql_drop_db, mysql_data_seek, C API functions -@subsubsection @code{mysql_debug()} - -@findex @code{mysql_debug()} - -@code{void mysql_debug(const char *debug)} - -@subsubheading Description -Does a @code{DBUG_PUSH} with the given string. @code{mysql_debug()} uses the -Fred Fish debug library. To use this function, you must compile the client -library to support debugging. -@xref{Debugging server}. @xref{Debugging client}. - -@subsubheading Return Values - -None. - -@subsubheading Errors -None. - -@subsubheading Example - -The call shown here causes the client library to generate a trace file in -@file{/tmp/client.trace} on the client machine: - -@example -mysql_debug("d:t:O,/tmp/client.trace"); -@end example - - -@node mysql_drop_db, mysql_dump_debug_info, mysql_debug, C API functions -@subsubsection @code{mysql_drop_db()} - -@findex @code{mysql_drop_db()} - -@code{int mysql_drop_db(MYSQL *mysql, const char *db)} - -@subsubheading Description -Drops the database named by the @code{db} parameter. - -This function is deprecated. It is preferable to use @code{mysql_query()} -to issue a SQL @code{DROP DATABASE} statement instead. - -@subsubheading Return Values - -Zero if the database was dropped successfully. Non-zero if an error -occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - -@subsubheading Example - -@example -if(mysql_drop_db(&mysql, "my_database")) - fprintf(stderr, "Failed to drop the database: Error: %s\n", - mysql_error(&mysql)); -@end example - - -@node mysql_dump_debug_info, mysql_eof, mysql_drop_db, C API functions -@subsubsection @code{mysql_dump_debug_info()} - -@findex @code{mysql_dump_debug_info()} - -@code{int mysql_dump_debug_info(MYSQL *mysql)} - -@subsubheading Description - -Instructs the server to write some debug information to the log. For -this to work, the connected user must have the @code{SUPER} privilege. - -@subsubheading Return Values - -Zero if the command was successful. Non-zero if an error occurred. - -@subsubheading Errors -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_eof, mysql_errno, mysql_dump_debug_info, C API functions -@subsubsection @code{mysql_eof()} - -@findex @code{mysql_eof()} - -@code{my_bool mysql_eof(MYSQL_RES *result)} - -@subsubheading Description - -This function is deprecated. @code{mysql_errno()} or @code{mysql_error()} -may be used instead. - -@code{mysql_eof()} determines whether the last row of a result -set has been read. - -If you acquire a result set from a successful call to -@code{mysql_store_result()}, the client receives the entire set in one -operation. In this case, a @code{NULL} return from -@code{mysql_fetch_row()} always means the end of the result set has been -reached and it is unnecessary to call @code{mysql_eof()}. When used -with @code{mysql_store_result()}, @code{mysql_eof()} will always return -true. - -On the other hand, if you use @code{mysql_use_result()} to initiate a result -set retrieval, the rows of the set are obtained from the server one by one as -you call @code{mysql_fetch_row()} repeatedly. Because an error may occur on -the connection during this process, a @code{NULL} return value from -@code{mysql_fetch_row()} does not necessarily mean the end of the result set -was reached normally. In this case, you can use @code{mysql_eof()} to -determine what happened. @code{mysql_eof()} returns a non-zero value if the -end of the result set was reached and zero if an error occurred. - -Historically, @code{mysql_eof()} predates the standard MySQL error -functions @code{mysql_errno()} and @code{mysql_error()}. Because those error -functions provide the same information, their use is preferred over -@code{mysql_eof()}, which is now deprecated. (In fact, they provide more -information, because @code{mysql_eof()} returns only a boolean value whereas -the error functions indicate a reason for the error when one occurs.) - -@subsubheading Return Values - -Zero if no error occurred. Non-zero if the end of the result set has been -reached. - -@subsubheading Errors -None. - -@subsubheading Example - -The following example shows how you might use @code{mysql_eof()}: - -@example -mysql_query(&mysql,"SELECT * FROM some_table"); -result = mysql_use_result(&mysql); -while((row = mysql_fetch_row(result))) -@{ - // do something with data -@} -if(!mysql_eof(result)) // mysql_fetch_row() failed due to an error -@{ - fprintf(stderr, "Error: %s\n", mysql_error(&mysql)); -@} -@end example - -However, you can achieve the same effect with the standard MySQL -error functions: - -@example -mysql_query(&mysql,"SELECT * FROM some_table"); -result = mysql_use_result(&mysql); -while((row = mysql_fetch_row(result))) -@{ - // do something with data -@} -if(mysql_errno(&mysql)) // mysql_fetch_row() failed due to an error -@{ - fprintf(stderr, "Error: %s\n", mysql_error(&mysql)); -@} -@end example - - -@node mysql_errno, mysql_error, mysql_eof, C API functions -@subsubsection @code{mysql_errno()} - -@findex @code{mysql_errno()} - -@code{unsigned int mysql_errno(MYSQL *mysql)} - -@subsubheading Description - -For the connection specified by @code{mysql}, @code{mysql_errno()} returns -the error code for the most recently invoked API function that can succeed -or fail. A return value of zero means that no error occurred. Client error -message numbers are listed in the MySQL @file{errmsg.h} header file. -Server error message numbers are listed in @file{mysqld_error.h}. In the -MySQL source distribution you can find a complete list of -error messages and error numbers in the file @file{Docs/mysqld_error.txt}. - -@subsubheading Return Values - -An error code value. Zero if no error occurred. - -@subsubheading Errors -None. - - -@node mysql_error, mysql_escape_string, mysql_errno, C API functions -@subsubsection @code{mysql_error()} - -@findex @code{mysql_error()} - -@code{char *mysql_error(MYSQL *mysql)} - -@subsubheading Description - -For the connection specified by @code{mysql}, @code{mysql_error()} returns -the error message for the most recently invoked API function that can succeed -or fail. An empty string (@code{""}) is returned if no error occurred. -This means the following two tests are equivalent: - -@example -if(mysql_errno(&mysql)) -@{ - // an error occurred -@} - -if(mysql_error(&mysql)[0] != '\0') -@{ - // an error occurred -@} -@end example - -The language of the client error messages may be changed by -recompiling the MySQL client library. Currently you can choose -error messages in several different languages. -@xref{Languages}. - -@subsubheading Return Values - -A character string that describes the error. An empty string if no error -occurred. - -@subsubheading Errors -None. - - -@node mysql_escape_string, mysql_fetch_field, mysql_error, C API functions -@subsubsection @code{mysql_escape_string()} - -@findex @code{mysql_escape_string()} - -You should use @code{mysql_real_escape_string()} instead! - -This function is identical to @code{mysql_real_escape_string()} except -that @code{mysql_real_escape_string()} takes a connection handler as -its first argument and escapes the string according to the current -character set. @code{mysql_escape_string()} does not take a connection -argument and does not respect the current charset setting. - - -@node mysql_fetch_field, mysql_fetch_fields, mysql_escape_string, C API functions -@subsubsection @code{mysql_fetch_field()} - -@findex @code{mysql_fetch_field()} - -@code{MYSQL_FIELD *mysql_fetch_field(MYSQL_RES *result)} - -@subsubheading Description - -Returns the definition of one column of a result set as a @code{MYSQL_FIELD} -structure. Call this function repeatedly to retrieve information about all -columns in the result set. @code{mysql_fetch_field()} returns @code{NULL} -when no more fields are left. - -@code{mysql_fetch_field()} is reset to return information about the first -field each time you execute a new @code{SELECT} query. The field returned by -@code{mysql_fetch_field()} is also affected by calls to -@code{mysql_field_seek()}. - -If you've called @code{mysql_query()} to perform a @code{SELECT} on a table -but have not called @code{mysql_store_result()}, MySQL returns the -default blob length (8K bytes) if you call @code{mysql_fetch_field()} to ask -for the length of a @code{BLOB} field. (The 8K size is chosen because -MySQL doesn't know the maximum length for the @code{BLOB}. This -should be made configurable sometime.) Once you've retrieved the result set, -@code{field->max_length} contains the length of the largest value for this -column in the specific query. - -@subsubheading Return Values - -The @code{MYSQL_FIELD} structure for the current column. @code{NULL} -if no columns are left. - -@subsubheading Errors -None. - -@subsubheading Example - -@example -MYSQL_FIELD *field; - -while((field = mysql_fetch_field(result))) -@{ - printf("field name %s\n", field->name); -@} -@end example - - -@node mysql_fetch_fields, mysql_fetch_field_direct, mysql_fetch_field, C API functions -@subsubsection @code{mysql_fetch_fields()} - -@findex @code{mysql_fetch_fields()} - -@code{MYSQL_FIELD *mysql_fetch_fields(MYSQL_RES *result)} - -@subsubheading Description - -Returns an array of all @code{MYSQL_FIELD} structures for a result set. -Each structure provides the field definition for one column of the result -set. - -@subsubheading Return Values - -An array of @code{MYSQL_FIELD} structures for all columns of a result set. - -@subsubheading Errors -None. - -@subsubheading Example - -@example -unsigned int num_fields; -unsigned int i; -MYSQL_FIELD *fields; - -num_fields = mysql_num_fields(result); -fields = mysql_fetch_fields(result); -for(i = 0; i < num_fields; i++) -@{ - printf("Field %u is %s\n", i, fields[i].name); -@} -@end example - - -@node mysql_fetch_field_direct, mysql_fetch_lengths, mysql_fetch_fields, C API functions -@subsubsection @code{mysql_fetch_field_direct()} - -@findex @code{mysql_fetch_field_direct()} - -@code{MYSQL_FIELD *mysql_fetch_field_direct(MYSQL_RES *result, unsigned int fieldnr)} - -@subsubheading Description - -Given a field number @code{fieldnr} for a column within a result set, returns -that column's field definition as a @code{MYSQL_FIELD} structure. You may use -this function to retrieve the definition for an arbitrary column. The value -of @code{fieldnr} should be in the range from 0 to -@code{mysql_num_fields(result)-1}. - -@subsubheading Return Values - -The @code{MYSQL_FIELD} structure for the specified column. - -@subsubheading Errors -None. - -@subsubheading Example - -@example -unsigned int num_fields; -unsigned int i; -MYSQL_FIELD *field; - -num_fields = mysql_num_fields(result); -for(i = 0; i < num_fields; i++) -@{ - field = mysql_fetch_field_direct(result, i); - printf("Field %u is %s\n", i, field->name); -@} -@end example - - -@node mysql_fetch_lengths, mysql_fetch_row, mysql_fetch_field_direct, C API functions -@subsubsection @code{mysql_fetch_lengths()} - -@findex @code{mysql_fetch_lengths()} - -@code{unsigned long *mysql_fetch_lengths(MYSQL_RES *result)} - -@subsubheading Description - -Returns the lengths of the columns of the current row within a result set. -If you plan to copy field values, this length information is also useful for -optimisation, because you can avoid calling @code{strlen()}. In addition, if -the result set contains binary data, you @strong{must} use this function to -determine the size of the data, because @code{strlen()} returns incorrect -results for any field containing null characters. - -The length for empty columns and for columns containing @code{NULL} values is -zero. To see how to distinguish these two cases, see the description for -@code{mysql_fetch_row()}. - -@subsubheading Return Values - -An array of unsigned long integers representing the size of each column (not -including any terminating null characters). -@code{NULL} if an error occurred. - -@subsubheading Errors -@code{mysql_fetch_lengths()} is valid only for the current row of the result -set. It returns @code{NULL} if you call it before calling -@code{mysql_fetch_row()} or after retrieving all rows in the result. - -@subsubheading Example - -@example -MYSQL_ROW row; -unsigned long *lengths; -unsigned int num_fields; -unsigned int i; - -row = mysql_fetch_row(result); -if (row) -@{ - num_fields = mysql_num_fields(result); - lengths = mysql_fetch_lengths(result); - for(i = 0; i < num_fields; i++) - @{ - printf("Column %u is %lu bytes in length.\n", i, lengths[i]); - @} -@} -@end example - - -@node mysql_fetch_row, mysql_field_count, mysql_fetch_lengths, C API functions -@subsubsection @code{mysql_fetch_row()} - -@findex @code{mysql_fetch_row()} - -@code{MYSQL_ROW mysql_fetch_row(MYSQL_RES *result)} - -@subsubheading Description - -Retrieves the next row of a result set. When used after -@code{mysql_store_result()}, @code{mysql_fetch_row()} returns @code{NULL} -when there are no more rows to retrieve. When used after -@code{mysql_use_result()}, @code{mysql_fetch_row()} returns @code{NULL} when -there are no more rows to retrieve or if an error occurred. - -The number of values in the row is given by @code{mysql_num_fields(result)}. -If @code{row} holds the return value from a call to @code{mysql_fetch_row()}, -pointers to the values are accessed as @code{row[0]} to -@code{row[mysql_num_fields(result)-1]}. @code{NULL} values in the row are -indicated by @code{NULL} pointers. - -The lengths of the field values in the row may be obtained by calling -@code{mysql_fetch_lengths()}. Empty fields and fields containing -@code{NULL} both have length 0; you can distinguish these by checking -the pointer for the field value. If the pointer is @code{NULL}, the field -is @code{NULL}; otherwise, the field is empty. - -@subsubheading Return Values - -A @code{MYSQL_ROW} structure for the next row. @code{NULL} if -there are no more rows to retrieve or if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - -@subsubheading Example - -@example -MYSQL_ROW row; -unsigned int num_fields; -unsigned int i; - -num_fields = mysql_num_fields(result); -while ((row = mysql_fetch_row(result))) -@{ - unsigned long *lengths; - lengths = mysql_fetch_lengths(result); - for(i = 0; i < num_fields; i++) - @{ - printf("[%.*s] ", (int) lengths[i], row[i] ? row[i] : "NULL"); - @} - printf("\n"); -@} -@end example - - -@node mysql_field_count, mysql_field_seek, mysql_fetch_row, C API functions -@subsubsection @code{mysql_field_count()} - -@findex @code{mysql_field_count()} - -@code{unsigned int mysql_field_count(MYSQL *mysql)} - -If you are using a version of MySQL earlier than Version 3.22.24, you -should use @code{unsigned int mysql_num_fields(MYSQL *mysql)} instead. - -@subsubheading Description - -Returns the number of columns for the most recent query on the connection. - -The normal use of this function is when @code{mysql_store_result()} -returned @code{NULL} (and thus you have no result set pointer). -In this case, you can call @code{mysql_field_count()} to -determine whether @code{mysql_store_result()} should have produced a -non-empty result. This allows the client program to take proper action -without knowing whether the query was a @code{SELECT} (or -@code{SELECT}-like) statement. The example shown here illustrates how this -may be done. - -@xref{NULL mysql_store_result, , @code{NULL mysql_store_result()}}. - -@subsubheading Return Values - -An unsigned integer representing the number of fields in a result set. - -@subsubheading Errors -None. - -@subsubheading Example - -@example -MYSQL_RES *result; -unsigned int num_fields; -unsigned int num_rows; - -if (mysql_query(&mysql,query_string)) -@{ - // error -@} -else // query succeeded, process any data returned by it -@{ - result = mysql_store_result(&mysql); - if (result) // there are rows - @{ - num_fields = mysql_num_fields(result); - // retrieve rows, then call mysql_free_result(result) - @} - else // mysql_store_result() returned nothing; should it have? - @{ - if(mysql_field_count(&mysql) == 0) - @{ - // query does not return data - // (it was not a SELECT) - num_rows = mysql_affected_rows(&mysql); - @} - else // mysql_store_result() should have returned data - @{ - fprintf(stderr, "Error: %s\n", mysql_error(&mysql)); - @} - @} -@} -@end example - -An alternative is to replace the @code{mysql_field_count(&mysql)} call with -@code{mysql_errno(&mysql)}. In this case, you are checking directly for an -error from @code{mysql_store_result()} rather than inferring from the value -of @code{mysql_field_count()} whether the statement was a -@code{SELECT}. - - -@node mysql_field_seek, mysql_field_tell, mysql_field_count, C API functions -@subsubsection @code{mysql_field_seek()} - -@findex @code{mysql_field_seek()} - -@code{MYSQL_FIELD_OFFSET mysql_field_seek(MYSQL_RES *result, MYSQL_FIELD_OFFSET offset)} - -@subsubheading Description - -Sets the field cursor to the given offset. The next call to -@code{mysql_fetch_field()} will retrieve the field definition of the column -associated with that offset. - -To seek to the beginning of a row, pass an @code{offset} value of zero. - -@subsubheading Return Values - -The previous value of the field cursor. - -@subsubheading Errors -None. - - -@node mysql_field_tell, mysql_free_result, mysql_field_seek, C API functions -@subsubsection @code{mysql_field_tell()} - -@findex @code{mysql_field_tell()} - -@code{MYSQL_FIELD_OFFSET mysql_field_tell(MYSQL_RES *result)} - -@subsubheading Description - -Returns the position of the field cursor used for the last -@code{mysql_fetch_field()}. This value can be used as an argument to -@code{mysql_field_seek()}. - -@subsubheading Return Values - -The current offset of the field cursor. - -@subsubheading Errors -None. - - -@node mysql_free_result, mysql_get_client_info, mysql_field_tell, C API functions -@subsubsection @code{mysql_free_result()} - -@findex @code{mysql_free_result()} - -@code{void mysql_free_result(MYSQL_RES *result)} - -@subsubheading Description - -Frees the memory allocated for a result set by @code{mysql_store_result()}, -@code{mysql_use_result()}, @code{mysql_list_dbs()}, etc. When you are done -with a result set, you must free the memory it uses by calling -@code{mysql_free_result()}. - -@subsubheading Return Values - -None. - -@subsubheading Errors -None. - - -@node mysql_get_client_info, mysql_get_host_info, mysql_free_result, C API functions -@subsubsection @code{mysql_get_client_info()} - -@findex @code{mysql_get_client_info()} - -@code{char *mysql_get_client_info(void)} - -@subsubheading Description - -Returns a string that represents the client library version. - -@subsubheading Return Values - -A character string that represents the MySQL client library version. - -@subsubheading Errors -None. - - -@node mysql_get_host_info, mysql_get_proto_info, mysql_get_client_info, C API functions -@subsubsection @code{mysql_get_host_info()} - -@findex @code{mysql_get_host_info()} - -@code{char *mysql_get_host_info(MYSQL *mysql)} - -@subsubheading Description - -Returns a string describing the type of connection in use, including the -server host name. - -@subsubheading Return Values - -A character string representing the server host name and the connection type. - -@subsubheading Errors -None. - - -@node mysql_get_proto_info, mysql_get_server_info, mysql_get_host_info, C API functions -@subsubsection @code{mysql_get_proto_info()} - -@findex @code{mysql_get_proto_info()} - -@code{unsigned int mysql_get_proto_info(MYSQL *mysql)} - -@subsubheading Description - -Returns the protocol version used by current connection. - -@subsubheading Return Values - -An unsigned integer representing the protocol version used by the current -connection. - -@subsubheading Errors -None. - - -@node mysql_get_server_info, mysql_info, mysql_get_proto_info, C API functions -@subsubsection @code{mysql_get_server_info()} - -@findex @code{mysql_get_server_info()} - -@code{char *mysql_get_server_info(MYSQL *mysql)} - -@subsubheading Description - -Returns a string that represents the server version number. - -@subsubheading Return Values - -A character string that represents the server version number. - -@subsubheading Errors -None. - - -@node mysql_info, mysql_init, mysql_get_server_info, C API functions -@subsubsection @code{mysql_info()} - -@findex @code{mysql_info()} - -@code{char *mysql_info(MYSQL *mysql)} - -@subsubheading Description - -Retrieves a string providing information about the most recently executed -query, but only for the statements listed here. For other statements, -@code{mysql_info()} returns @code{NULL}. The format of the string varies -depending on the type of query, as described here. The numbers are -illustrative only; the string will contain values appropriate for the query. - -@table @code -@item INSERT INTO ... SELECT ... -String format: @code{Records: 100 Duplicates: 0 Warnings: 0} -@item INSERT INTO ... VALUES (...),(...),(...)... -String format: @code{Records: 3 Duplicates: 0 Warnings: 0} -@item LOAD DATA INFILE ... -String format: @code{Records: 1 Deleted: 0 Skipped: 0 Warnings: 0} -@item ALTER TABLE -String format: @code{Records: 3 Duplicates: 0 Warnings: 0} -@item UPDATE -String format: @code{Rows matched: 40 Changed: 40 Warnings: 0} -@end table - -Note that @code{mysql_info()} returns a non-@code{NULL} value for the -@code{INSERT ... VALUES} statement only if multiple value lists are -specified in the statement. - -@subsubheading Return Values - -A character string representing additional information about the most -recently executed query. @code{NULL} if no information is available for the -query. - -@subsubheading Errors -None. - - -@node mysql_init, mysql_insert_id, mysql_info, C API functions -@subsubsection @code{mysql_init()} - -@findex @code{mysql_init()} - -@code{MYSQL *mysql_init(MYSQL *mysql)} - -@subsubheading Description - -Allocates or initialises a @code{MYSQL} object suitable for -@code{mysql_real_connect()}. If @code{mysql} is a @code{NULL} pointer, the -function allocates, initialises, and returns a new object. Otherwise, the -object is initialised and the address of the object is returned. If -@code{mysql_init()} allocates a new object, it will be freed when -@code{mysql_close()} is called to close the connection. - -@subsubheading Return Values - -An initialised @code{MYSQL*} handle. @code{NULL} if there was -insufficient memory to allocate a new object. - -@subsubheading Errors -In case of insufficient memory, @code{NULL} is returned. - - -@node mysql_insert_id, mysql_kill, mysql_init, C API functions -@subsubsection @code{mysql_insert_id()} - -@findex @code{mysql_insert_id()} - -@code{my_ulonglong mysql_insert_id(MYSQL *mysql)} - -@subsubheading Description - -Returns the ID generated for an @code{AUTO_INCREMENT} column by the previous -query. Use this function after you have performed an @code{INSERT} query -into a table that contains an @code{AUTO_INCREMENT} field. - -Note that @code{mysql_insert_id()} returns @code{0} if the previous query -does not generate an @code{AUTO_INCREMENT} value. If you need to save -the value for later, be sure to call @code{mysql_insert_id()} immediately -after the query that generates the value. - -@code{mysql_insert_id()} is updated after @code{INSERT} and -@code{UPDATE} statements that generate an @code{AUTO_INCREMENT} value or -that set a column value to @code{LAST_INSERT_ID(expr)}. -@xref{Miscellaneous functions}. - -Also note that the value of the SQL @code{LAST_INSERT_ID()} function always -contains the most recently generated @code{AUTO_INCREMENT} value, and is -not reset between queries because the value of that function is maintained -in the server. - -@subsubheading Return Values - -The value of the @code{AUTO_INCREMENT} field that was updated by the previous -query. Returns zero if there was no previous query on the connection or if -the query did not update an @code{AUTO_INCREMENT} value. - -@subsubheading Errors -None. - - -@node mysql_kill, mysql_list_dbs, mysql_insert_id, C API functions -@subsubsection @code{mysql_kill()} - -@findex @code{mysql_kill()} - -@code{int mysql_kill(MYSQL *mysql, unsigned long pid)} - -@subsubheading Description - -Asks the server to kill the thread specified by @code{pid}. - -@subsubheading Return Values - -Zero for success. Non-zero if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_list_dbs, mysql_list_fields, mysql_kill, C API functions -@subsubsection @code{mysql_list_dbs()} - -@findex @code{mysql_list_dbs()} - -@code{MYSQL_RES *mysql_list_dbs(MYSQL *mysql, const char *wild)} - -@subsubheading Description - -Returns a result set consisting of database names on the server that match -the simple regular expression specified by the @code{wild} parameter. -@code{wild} may contain the wildcard characters @samp{%} or @samp{_}, or may -be a @code{NULL} pointer to match all databases. Calling -@code{mysql_list_dbs()} is similar to executing the query @code{SHOW -databases [LIKE wild]}. - -You must free the result set with @code{mysql_free_result()}. - -@subsubheading Return Values - -A @code{MYSQL_RES} result set for success. @code{NULL} if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_OUT_OF_MEMORY -Out of memory. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_list_fields, mysql_list_processes, mysql_list_dbs, C API functions -@subsubsection @code{mysql_list_fields()} - -@findex @code{mysql_list_fields()} - -@code{MYSQL_RES *mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)} - -@subsubheading Description - -Returns a result set consisting of field names in the given table that match -the simple regular expression specified by the @code{wild} parameter. -@code{wild} may contain the wildcard characters @samp{%} or @samp{_}, or may -be a @code{NULL} pointer to match all fields. Calling -@code{mysql_list_fields()} is similar to executing the query @code{SHOW -COLUMNS FROM tbl_name [LIKE wild]}. - -Note that it's recommended that you use @code{SHOW COLUMNS FROM tbl_name} -instead of @code{mysql_list_fields()}. - -You must free the result set with @code{mysql_free_result()}. - -@subsubheading Return Values - -A @code{MYSQL_RES} result set for success. @code{NULL} if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_list_processes, mysql_list_tables, mysql_list_fields, C API functions -@subsubsection @code{mysql_list_processes()} - -@findex @code{mysql_list_processes()} - -@code{MYSQL_RES *mysql_list_processes(MYSQL *mysql)} - -@subsubheading Description - -Returns a result set describing the current server threads. This is the same -kind of information as that reported by @code{mysqladmin processlist} or -a @code{SHOW PROCESSLIST} query. - -You must free the result set with @code{mysql_free_result()}. - -@subsubheading Return Values - -A @code{MYSQL_RES} result set for success. @code{NULL} if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_list_tables, mysql_num_fields, mysql_list_processes, C API functions -@subsubsection @code{mysql_list_tables()} - -@findex @code{mysql_list_tables()} - -@code{MYSQL_RES *mysql_list_tables(MYSQL *mysql, const char *wild)} - -@subsubheading Description - -Returns a result set consisting of table names in the current database that -match the simple regular expression specified by the @code{wild} parameter. -@code{wild} may contain the wildcard characters @samp{%} or @samp{_}, or may -be a @code{NULL} pointer to match all tables. Calling -@code{mysql_list_tables()} is similar to executing the query @code{SHOW -tables [LIKE wild]}. - -You must free the result set with @code{mysql_free_result()}. - -@subsubheading Return Values - -A @code{MYSQL_RES} result set for success. @code{NULL} if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_num_fields, mysql_num_rows, mysql_list_tables, C API functions -@subsubsection @code{mysql_num_fields()} - -@findex @code{mysql_num_fields()} -@findex @code{mysql_field_count()} - -@code{unsigned int mysql_num_fields(MYSQL_RES *result)} - -or - -@code{unsigned int mysql_num_fields(MYSQL *mysql)} - -The second form doesn't work on MySQL Version 3.22.24 or newer. To pass a -@code{MYSQL*} argument, you must use -@code{unsigned int mysql_field_count(MYSQL *mysql)} instead. - -@subsubheading Description - -Returns the number of columns in a result set. - -Note that you can get the number of columns either from a pointer to a result -set or to a connection handle. You would use the connection handle if -@code{mysql_store_result()} or @code{mysql_use_result()} returned -@code{NULL} (and thus you have no result set pointer). In this case, you can -call @code{mysql_field_count()} to determine whether -@code{mysql_store_result()} should have produced a non-empty result. This -allows the client program to take proper action without knowing whether or -not the query was a @code{SELECT} (or @code{SELECT}-like) statement. The -example shown here illustrates how this may be done. - -@xref{NULL mysql_store_result, , @code{NULL mysql_store_result()}}. - -@subsubheading Return Values - -An unsigned integer representing the number of fields in a result set. - -@subsubheading Errors -None. - -@subsubheading Example - -@example -MYSQL_RES *result; -unsigned int num_fields; -unsigned int num_rows; - -if (mysql_query(&mysql,query_string)) -@{ - // error -@} -else // query succeeded, process any data returned by it -@{ - result = mysql_store_result(&mysql); - if (result) // there are rows - @{ - num_fields = mysql_num_fields(result); - // retrieve rows, then call mysql_free_result(result) - @} - else // mysql_store_result() returned nothing; should it have? - @{ - if (mysql_errno(&mysql)) - @{ - fprintf(stderr, "Error: %s\n", mysql_error(&mysql)); - @} - else if (mysql_field_count(&mysql) == 0) - @{ - // query does not return data - // (it was not a SELECT) - num_rows = mysql_affected_rows(&mysql); - @} - @} -@} -@end example - -An alternative (if you know that your query should have returned a result set) -is to replace the @code{mysql_errno(&mysql)} call with a check if -@code{mysql_field_count(&mysql)} is = 0. This will only happen if something -went wrong. - - -@node mysql_num_rows, mysql_options, mysql_num_fields, C API functions -@subsubsection @code{mysql_num_rows()} - -@findex @code{mysql_num_rows()} - -@code{my_ulonglong mysql_num_rows(MYSQL_RES *result)} - -@subsubheading Description - -Returns the number of rows in the result set. - -The use of @code{mysql_num_rows()} depends on whether you use -@code{mysql_store_result()} or @code{mysql_use_result()} to return the result -set. If you use @code{mysql_store_result()}, @code{mysql_num_rows()} may be -called immediately. If you use @code{mysql_use_result()}, -@code{mysql_num_rows()} will not return the correct value until all the rows -in the result set have been retrieved. - -@subsubheading Return Values - -The number of rows in the result set. - -@subsubheading Errors -None. - - -@node mysql_options, mysql_ping, mysql_num_rows, C API functions -@subsubsection @code{mysql_options()} - -@findex @code{mysql_options()} - -@code{int mysql_options(MYSQL *mysql, enum mysql_option option, const char *arg)} - -@subsubheading Description - -Can be used to set extra connect options and affect behaviour for a connection. -This function may be called multiple times to set several options. - -@code{mysql_options()} should be called after @code{mysql_init()} and before -@code{mysql_connect()} or @code{mysql_real_connect()}. - -The @code{option} argument is the option that you want to set; the @code{arg} -argument is the value for the option. If the option is an integer, then -@code{arg} should point to the value of the integer. - -Possible options values: - -@multitable @columnfractions .42 .20 .38 -@item @strong{Option} @tab @strong{Argument type} @tab @strong{Function} -@item @code{MYSQL_OPT_CONNECT_TIMEOUT} @tab @code{unsigned int *} @tab Connect timeout in seconds. -@item @code{MYSQL_OPT_COMPRESS} @tab Not used @tab Use the compressed client/server protocol. -@item @code{MYSQL_OPT_LOCAL_INFILE} @tab optional pointer to uint @tab If no pointer is given or if pointer points to an @code{unsigned int != 0} the command @code{LOAD LOCAL INFILE} is enabled. -@item @code{MYSQL_OPT_NAMED_PIPE} @tab Not used @tab Use named pipes to connect to a MySQL server on NT. -@item @code{MYSQL_INIT_COMMAND} @tab @code{char *} @tab Command to execute when connecting to the MySQL server. Will automatically be re-executed when reconnecting. -@item @code{MYSQL_READ_DEFAULT_FILE} @tab @code{char *} @tab Read options from the named option file instead of from @file{my.cnf}. -@item @code{MYSQL_READ_DEFAULT_GROUP} @tab @code{char *} @tab Read options from the named group from @file{my.cnf} or the file specified with @code{MYSQL_READ_DEFAULT_FILE}. -@end multitable - -Note that the group @code{client} is always read if you use -@code{MYSQL_READ_DEFAULT_FILE} or @code{MYSQL_READ_DEFAULT_GROUP}. - -The specified group in the option file may contain the following options: - -@multitable @columnfractions .25 .60 -@item @strong{Option} @tab @strong{Description} -@item @code{connect-timeout} @tab Connect timeout in seconds. On Linux this timeout is also used for waiting for the first answer from the server. -@item @code{compress} @tab Use the compressed client/server protocol. -@item @code{database} @tab Connect to this database if no database was specified in the connect command. -@item @code{debug} @tab Debug options. -@item @code{disable-local-infile} @tab Disable use of @code{LOAD DATA LOCAL}. -@item @code{host} @tab Default host name. -@item @code{init-command} @tab Command to execute when connecting to MySQL server. Will automatically be re-executed when reconnecting. -@item @code{interactive-timeout} @tab Same as specifying @code{CLIENT_INTERACTIVE} to @code{mysql_real_connect()}. @xref{mysql_real_connect}. -@item @code{local-infile[=(0|1)]} @tab If no argument or argument != 0 then enable use of @code{LOAD DATA LOCAL}. -@item @code{password} @tab Default password. -@item @code{pipe} @tab Use named pipes to connect to a MySQL server on NT. -@item @code{port} @tab Default port number. -@item @code{return-found-rows} @tab Tell @code{mysql_info()} to return found rows instead of updated rows when using @code{UPDATE}. -@item @code{socket} @tab Default socket number. -@item @code{user} @tab Default user. -@end multitable - -Note that @code{timeout} has been replaced by @code{connect-timeout}, but -@code{timeout} will still work for a while. - -For more information about option files, see @ref{Option files}. - -@subsubheading Return Values - -Zero for success. Non-zero if you used an unknown option. - -@subsubheading Example - -@example -MYSQL mysql; - -mysql_init(&mysql); -mysql_options(&mysql,MYSQL_OPT_COMPRESS,0); -mysql_options(&mysql,MYSQL_READ_DEFAULT_GROUP,"odbc"); -if (!mysql_real_connect(&mysql,"host","user","passwd","database",0,NULL,0)) -@{ - fprintf(stderr, "Failed to connect to database: Error: %s\n", - mysql_error(&mysql)); -@} -@end example - -The above requests the client to use the compressed client/server protocol and -read the additional options from the @code{odbc} section in the @file{my.cnf} -file. - - -@node mysql_ping, mysql_query, mysql_options, C API functions -@subsubsection @code{mysql_ping()} - -@findex @code{mysql_ping()} - -@code{int mysql_ping(MYSQL *mysql)} - -@subsubheading Description - -Checks whether the connection to the server is working. If it has gone -down, an automatic reconnection is attempted. - -This function can be used by clients that remain idle for a long while, -to check whether the server has closed the connection and reconnect -if necessary. - -@subsubheading Return Values - -Zero if the server is alive. Non-zero if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_query, mysql_real_connect, mysql_ping, C API functions -@subsubsection @code{mysql_query()} - -@findex @code{mysql_query()} - -@code{int mysql_query(MYSQL *mysql, const char *query)} - -@subsubheading Description -Executes the SQL query pointed to by the null-terminated string @code{query}. -The query must consist of a single SQL statement. You should not add -a terminating semicolon (@samp{;}) or @code{\g} to the statement. - -@code{mysql_query()} cannot be used for queries that contain binary data; you -should use @code{mysql_real_query()} instead. (Binary data may contain the -@samp{\0} character, which @code{mysql_query()} interprets as the end of the -query string.) - -If you want to know if the query should return a result set or not, you can -use @code{mysql_field_count()} to check for this. -@xref{mysql_field_count, , @code{mysql_field_count()}}. - -@subsubheading Return Values - -Zero if the query was successful. Non-zero if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_real_connect, mysql_real_escape_string, mysql_query, C API functions -@subsubsection @code{mysql_real_connect()} - -@findex @code{mysql_real_connect()} - -@code{MYSQL *mysql_real_connect(MYSQL *mysql, const char *host, - const char *user, const char *passwd, const char *db, - unsigned int port, const char *unix_socket, - unsigned int client_flag)} - -@subsubheading Description - -@code{mysql_real_connect()} attempts to establish a connection to a -MySQL database engine running on @code{host}. -@code{mysql_real_connect()} must complete successfully before you can execute -any of the other API functions, with the exception of -@code{mysql_get_client_info()}. - -The parameters are specified as follows: - -@itemize @bullet -@item -The first parameter should be the address of an existing @code{MYSQL} -structure. Before calling @code{mysql_real_connect()} you must call -@code{mysql_init()} to initialise the @code{MYSQL} structure. You can -change a lot of connect options with the @code{mysql_options()} -call. @xref{mysql_options, @code{mysql_options()}}. - -@item -The value of @code{host} may be either a hostname or an IP address. If -@code{host} is @code{NULL} or the string @code{"localhost"}, a connection to -the local host is assumed. If the OS supports sockets (Unix) or named pipes -(Windows), they are used instead of TCP/IP to connect to the server. - -@item -The @code{user} parameter contains the user's MySQL login ID. If -@code{user} is @code{NULL}, the current user is assumed. Under Unix, this is -the current login name. Under Windows ODBC, the current user name must be -specified explicitly. -@xref{ODBC administrator}. - -@item -The @code{passwd} parameter contains the password for @code{user}. If -@code{passwd} is @code{NULL}, only entries in the @code{user} table for the -user that have a blank (empty) password field will be checked for a match. This -allows the database administrator to set up the MySQL privilege -system in such a way that users get different privileges depending on whether -or not they have specified a password. - -Note: Do not attempt to encrypt the password before calling -@code{mysql_real_connect()}; password encryption is handled automatically by -the client API. - -@item -@code{db} is the database name. -If @code{db} is not @code{NULL}, the connection will set the default -database to this value. - -@item -If @code{port} is not 0, the value will be used as the port number -for the TCP/IP connection. Note that the @code{host} parameter -determines the type of the connection. - -@item -If @code{unix_socket} is not @code{NULL}, the string specifies the -socket or named pipe that should be used. Note that the @code{host} -parameter determines the type of the connection. - -@item -The value of @code{client_flag} is usually 0, but can be set to a combination -of the following flags in very special circumstances: - -@multitable @columnfractions .30 .65 -@item @strong{Flag name} @tab @strong{Flag description} -@item @code{CLIENT_COMPRESS} @tab Use compression protocol. -@item @code{CLIENT_FOUND_ROWS} @tab Return the number of found (matched) rows, not the number of affected rows. -@item @code{CLIENT_IGNORE_SPACE} @tab Allow spaces after function names. Makes all functions names reserved words. -@item @code{CLIENT_INTERACTIVE} @tab Allow @code{interactive_timeout} seconds (instead of @code{wait_timeout} seconds) of inactivity before closing the connection. -@item @code{CLIENT_NO_SCHEMA} @tab Don't allow the @code{db_name.tbl_name.col_name} syntax. This is for ODBC. It causes the parser to generate an error if you use that syntax, which is useful for trapping bugs in some ODBC programs. -@item @code{CLIENT_ODBC} @tab The client is an ODBC client. This changes @code{mysqld} to be more ODBC-friendly. -@item @code{CLIENT_SSL} @tab Use SSL (encrypted protocol). -@end multitable -@end itemize - -@subsubheading Return Values - -A @code{MYSQL*} connection handle if the connection was successful, -@code{NULL} if the connection was unsuccessful. For a successful connection, -the return value is the same as the value of the first parameter. - -@subsubheading Errors - -@table @code -@item CR_CONN_HOST_ERROR -Failed to connect to the MySQL server. - -@item CR_CONNECTION_ERROR -Failed to connect to the local MySQL server. - -@item CR_IPSOCK_ERROR -Failed to create an IP socket. - -@item CR_OUT_OF_MEMORY -Out of memory. - -@item CR_SOCKET_CREATE_ERROR -Failed to create a Unix socket. - -@item CR_UNKNOWN_HOST -Failed to find the IP address for the hostname. - -@item CR_VERSION_ERROR -A protocol mismatch resulted from attempting to connect to a server with a -client library that uses a different protocol version. This can happen if you -use a very old client library to connect to a new server that wasn't started -with the @code{--old-protocol} option. - -@item CR_NAMEDPIPEOPEN_ERROR -Failed to create a named pipe on Windows. - -@item CR_NAMEDPIPEWAIT_ERROR -Failed to wait for a named pipe on Windows. - -@item CR_NAMEDPIPESETSTATE_ERROR -Failed to get a pipe handler on Windows. - -@item CR_SERVER_LOST -If @code{connect_timeout} > 0 and it took longer then @code{connect_timeout} -seconds to connect to the server or if the server died while executing the -@code{init-command}. - -@end table - -@subsubheading Example - -@example -MYSQL mysql; - -mysql_init(&mysql); -mysql_options(&mysql,MYSQL_READ_DEFAULT_GROUP,"your_prog_name"); -if (!mysql_real_connect(&mysql,"host","user","passwd","database",0,NULL,0)) -@{ - fprintf(stderr, "Failed to connect to database: Error: %s\n", - mysql_error(&mysql)); -@} -@end example - -By using @code{mysql_options()} the MySQL library will read the -@code{[client]} and @code{[your_prog_name]} sections in the @file{my.cnf} -file which will ensure that your program will work, even if someone has -set up MySQL in some non-standard way. - -Note that upon connection, @code{mysql_real_connect()} sets the @code{reconnect} -flag (part of the @code{MYSQL} structure) to a value of @code{1}. This -flag indicates, in the event that a query cannot be performed because -of a lost connection, to try reconnecting to the server before giving up. - - -@node mysql_real_escape_string, mysql_real_query, mysql_real_connect, C API functions -@subsubsection @code{mysql_real_escape_string()} - -@findex @code{mysql_real_escape_string()} - -@code{unsigned long mysql_real_escape_string(MYSQL *mysql, char *to, const char *from, unsigned long length)} - -@subsubheading Description - -This function is used to create a legal SQL string that you can use in a -SQL statement. @xref{String syntax}. - -The string in @code{from} is encoded to an escaped SQL string, taking -into account the current character set of the connection. The result is placed -in @code{to} and a terminating null byte is appended. Characters -encoded are @code{NUL} (ASCII 0), @samp{\n}, @samp{\r}, @samp{\}, -@samp{'}, @samp{"}, and Control-Z (@pxref{Literals}). -(Strictly speaking, MySQL requires only that backslash and the quote -character used to quote the string in the query be escaped. This function -quotes the other characters to make them easier to read in log files.) - -The string pointed to by @code{from} must be @code{length} bytes long. You -must allocate the @code{to} buffer to be at least @code{length*2+1} bytes -long. (In the worse case, each character may need to be encoded as using two -bytes, and you need room for the terminating null byte.) When -@code{mysql_escape_string()} returns, the contents of @code{to} will be a -null-terminated string. The return value is the length of the encoded -string, not including the terminating null character. - -@subsubheading Example - -@example -char query[1000],*end; - -end = strmov(query,"INSERT INTO test_table values("); -*end++ = '\''; -end += mysql_real_escape_string(&mysql, end,"What's this",11); -*end++ = '\''; -*end++ = ','; -*end++ = '\''; -end += mysql_real_escape_string(&mysql, end,"binary data: \0\r\n",16); -*end++ = '\''; -*end++ = ')'; - -if (mysql_real_query(&mysql,query,(unsigned int) (end - query))) -@{ - fprintf(stderr, "Failed to insert row, Error: %s\n", - mysql_error(&mysql)); -@} -@end example - -The @code{strmov()} function used in the example is included in the -@code{mysqlclient} library and works like @code{strcpy()} but returns a -pointer to the terminating null of the first parameter. - -@subsubheading Return Values - -The length of the value placed into @code{to}, not including the -terminating null character. - -@subsubheading Errors -None. - - -@node mysql_real_query, mysql_reload, mysql_real_escape_string, C API functions -@subsubsection @code{mysql_real_query()} - -@findex @code{mysql_real_query()} - -@code{int mysql_real_query(MYSQL *mysql, const char *query, unsigned long length)} - -@subsubheading Description - -Executes the SQL query pointed to by @code{query}, which should be a string -@code{length} bytes long. The query must consist of a single SQL statement. -You should not add a terminating semicolon (@samp{;}) or @code{\g} to the -statement. - -You @strong{must} use @code{mysql_real_query()} rather than -@code{mysql_query()} for queries that contain binary data, because binary data -may contain the @samp{\0} character. In addition, @code{mysql_real_query()} -is faster than @code{mysql_query()} because it does not call @code{strlen()} on -the query string. - -If you want to know if the query should return a result set or not, you can -use @code{mysql_field_count()} to check for this. -@xref{mysql_field_count, @code{mysql_field_count()}}. - -@subsubheading Return Values - -Zero if the query was successful. Non-zero if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_reload, mysql_row_seek, mysql_real_query, C API functions -@subsubsection @code{mysql_reload()} - -@findex @code{mysql_reload()} - -@code{int mysql_reload(MYSQL *mysql)} - -@subsubheading Description - -Asks the MySQL server to reload the grant tables. The -connected user must have the @code{RELOAD} privilege. - -This function is deprecated. It is preferable to use @code{mysql_query()} -to issue a SQL @code{FLUSH PRIVILEGES} statement instead. - -@subsubheading Return Values - -Zero for success. Non-zero if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_row_seek, mysql_row_tell, mysql_reload, C API functions -@subsubsection @code{mysql_row_seek()} - -@findex @code{mysql_row_seek()} - -@code{MYSQL_ROW_OFFSET mysql_row_seek(MYSQL_RES *result, MYSQL_ROW_OFFSET offset)} - -@subsubheading Description -Sets the row cursor to an arbitrary row in a query result set. This requires -that the result set structure contains the entire result of the query, so -@code{mysql_row_seek()} may be used in conjunction only with -@code{mysql_store_result()}, not with @code{mysql_use_result()}. - -The offset should be a value returned from a call to @code{mysql_row_tell()} -or to @code{mysql_row_seek()}. This value is not simply a row number; if you -want to seek to a row within a result set using a row number, use -@code{mysql_data_seek()} instead. - -@subsubheading Return Values - -The previous value of the row cursor. This value may be passed to a -subsequent call to @code{mysql_row_seek()}. - -@subsubheading Errors -None. - - -@node mysql_row_tell, mysql_select_db, mysql_row_seek, C API functions -@subsubsection @code{mysql_row_tell()} - -@findex @code{mysql_row_tell()} - -@code{MYSQL_ROW_OFFSET mysql_row_tell(MYSQL_RES *result)} - -@subsubheading Description - -Returns the current position of the row cursor for the last -@code{mysql_fetch_row()}. This value can be used as an argument to -@code{mysql_row_seek()}. - -You should use @code{mysql_row_tell()} only after @code{mysql_store_result()}, -not after @code{mysql_use_result()}. - -@subsubheading Return Values - -The current offset of the row cursor. - -@subsubheading Errors -None. - - -@node mysql_select_db, mysql_shutdown, mysql_row_tell, C API functions -@subsubsection @code{mysql_select_db()} - -@findex @code{mysql_select_db()} - -@code{int mysql_select_db(MYSQL *mysql, const char *db)} - -@subsubheading Description - -Causes the database specified by @code{db} to become the default (current) -database on the connection specified by @code{mysql}. In subsequent queries, -this database is the default for table references that do not include an -explicit database specifier. - -@code{mysql_select_db()} fails unless the connected user can be authenticated -as having permission to use the database. - -@subsubheading Return Values - -Zero for success. Non-zero if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_shutdown, mysql_stat, mysql_select_db, C API functions -@subsubsection @code{mysql_shutdown()} - -@findex @code{mysql_shutdown()} - -@code{int mysql_shutdown(MYSQL *mysql)} - -@subsubheading Description - -Asks the database server to shut down. The connected user must have -@code{SHUTDOWN} privileges. - -@subsubheading Return Values - -Zero for success. Non-zero if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_stat, mysql_store_result, mysql_shutdown, C API functions -@subsubsection @code{mysql_stat()} - -@findex @code{mysql_stat()} - -@code{char *mysql_stat(MYSQL *mysql)} - -@subsubheading Description - -Returns a character string containing information similar to that provided by -the @code{mysqladmin status} command. This includes uptime in seconds and -the number of running threads, questions, reloads, and open tables. - -@subsubheading Return Values - -A character string describing the server status. @code{NULL} if an -error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_store_result, mysql_thread_id, mysql_stat, C API functions -@subsubsection @code{mysql_store_result()} - -@findex @code{mysql_store_result()} - -@code{MYSQL_RES *mysql_store_result(MYSQL *mysql)} - -@subsubheading Description - -You must call @code{mysql_store_result()} or @code{mysql_use_result()} -for every query that successfully retrieves data (@code{SELECT}, -@code{SHOW}, @code{DESCRIBE}, @code{EXPLAIN}). - -You don't have to call @code{mysql_store_result()} or -@code{mysql_use_result()} for other queries, but it will not do any -harm or cause any notable performance if you call @code{mysql_store_result()} -in all cases. You can detect if the query didn't have a result set by -checking if @code{mysql_store_result()} returns 0 (more about this later one). - -If you want to know if the query should return a result set or not, you can -use @code{mysql_field_count()} to check for this. -@xref{mysql_field_count, @code{mysql_field_count()}}. - -@code{mysql_store_result()} reads the entire result of a query to the client, -allocates a @code{MYSQL_RES} structure, and places the result into this -structure. - -@code{mysql_store_result()} returns a null pointer if the query didn't return -a result set (if the query was, for example, an @code{INSERT} statement). - -@code{mysql_store_result()} also returns a null pointer if reading of the -result set failed. You can check if you got an error by checking if -@code{mysql_error()} doesn't return a null pointer, if -@code{mysql_errno()} returns <> 0, or if @code{mysql_field_count()} -returns <> 0. - -An empty result set is returned if there are no rows returned. (An empty -result set differs from a null pointer as a return value.) - -Once you have called @code{mysql_store_result()} and got a result back -that isn't a null pointer, you may call @code{mysql_num_rows()} to find -out how many rows are in the result set. - -You can call @code{mysql_fetch_row()} to fetch rows from the result set, -or @code{mysql_row_seek()} and @code{mysql_row_tell()} to obtain or -set the current row position within the result set. - -You must call @code{mysql_free_result()} once you are done with the result -set. - -@xref{NULL mysql_store_result, , @code{NULL mysql_store_result()}}. - -@subsubheading Return Values - -A @code{MYSQL_RES} result structure with the results. @code{NULL} if -an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_OUT_OF_MEMORY -Out of memory. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - - -@node mysql_thread_id, mysql_use_result, mysql_store_result, C API functions -@subsubsection @code{mysql_thread_id()} - -@findex @code{mysql_thread_id()} - -@code{unsigned long mysql_thread_id(MYSQL *mysql)} - -@subsubheading Description - -Returns the thread ID of the current connection. This value can be used as -an argument to @code{mysql_kill()} to kill the thread. - -If the connection is lost and you reconnect with @code{mysql_ping()}, the -thread ID will change. This means you should not get the thread ID and store -it for later. You should get it when you need it. - -@subsubheading Return Values - -The thread ID of the current connection. - -@subsubheading Errors -None. - - -@node mysql_use_result, , mysql_thread_id, C API functions -@subsubsection @code{mysql_use_result()} - -@findex @code{mysql_use_result()} - -@code{MYSQL_RES *mysql_use_result(MYSQL *mysql)} - -@subsubheading Description - -You must call @code{mysql_store_result()} or @code{mysql_use_result()} for -every query that successfully retrieves data (@code{SELECT}, @code{SHOW}, -@code{DESCRIBE}, @code{EXPLAIN}). - -@code{mysql_use_result()} initiates a result set retrieval but does not -actually read the result set into the client like @code{mysql_store_result()} -does. Instead, each row must be retrieved individually by making calls to -@code{mysql_fetch_row()}. This reads the result of a query directly from the -server without storing it in a temporary table or local buffer, which is -somewhat faster and uses much less memory than @code{mysql_store_result()}. -The client will only allocate memory for the current row and a communication -buffer that may grow up to @code{max_allowed_packet} bytes. - -On the other hand, you shouldn't use @code{mysql_use_result()} if you are -doing a lot of processing for each row on the client side, or if the output -is sent to a screen on which the user may type a @code{^S} (stop scroll). -This will tie up the server and prevent other threads from updating any -tables from which the data is being fetched. - -When using @code{mysql_use_result()}, you must execute -@code{mysql_fetch_row()} until a @code{NULL} value is returned, otherwise, the -unfetched rows will be returned as part of the result set for your next -query. The C API will give the error @code{Commands out of sync; you can't -run this command now} if you forget to do this! - -You may not use @code{mysql_data_seek()}, @code{mysql_row_seek()}, -@code{mysql_row_tell()}, @code{mysql_num_rows()}, or -@code{mysql_affected_rows()} with a result returned from -@code{mysql_use_result()}, nor may you issue other queries until the -@code{mysql_use_result()} has finished. (However, after you have fetched all -the rows, @code{mysql_num_rows()} will accurately return the number of rows -fetched.) - -You must call @code{mysql_free_result()} once you are done with the result -set. - -@subsubheading Return Values - -A @code{MYSQL_RES} result structure. @code{NULL} if an error occurred. - -@subsubheading Errors - -@table @code -@item CR_COMMANDS_OUT_OF_SYNC -Commands were executed in an improper order. -@item CR_OUT_OF_MEMORY -Out of memory. -@item CR_SERVER_GONE_ERROR -The MySQL server has gone away. -@item CR_SERVER_LOST -The connection to the server was lost during the query. -@item CR_UNKNOWN_ERROR -An unknown error occurred. -@end table - -@node C Thread functions, C Embedded Server func, C API functions, C -@subsection C Threaded Function Descriptions - -You need to use the following functions when you want to create a -threaded client. @xref{Threaded clients}. - -@menu -* my_init:: @code{my_init()} -* mysql_thread_init:: @code{mysql_thread_init()} -* mysql_thread_end:: @code{mysql_thread_end()} -* mysql_thread_safe:: @code{mysql_thread_safe()} -@end menu - -@node my_init, mysql_thread_init, C Thread functions, C Thread functions -@subsubsection @code{my_init()} - -@findex @code{my_init()} - -@code{void my_init(void)} - -@subsubheading Description - -This function needs to be called once in the program before calling any -MySQL function. This initialises some global variables that MySQL -needs. If you are using a thread-safe client library, this will also -call @code{mysql_thread_init()} for this thread. - -This is automatically called by @code{mysql_init()}, -@code{mysql_server_init()} and @code{mysql_connect()}. - -@subsubheading Return Values - -None. - -@node mysql_thread_init, mysql_thread_end, my_init, C Thread functions -@subsubsection @code{mysql_thread_init()} - -@findex @code{mysql_thread_init()} - -@code{my_bool mysql_thread_init(void)} - -@subsubheading Description - -This function needs to be called for each created thread to initialise -thread-specific variables. - -This is automatically called by @code{my_init()} and @code{mysql_connect()}. - -@subsubheading Return Values - -None. - -@node mysql_thread_end, mysql_thread_safe, mysql_thread_init, C Thread functions -@subsubsection @code{mysql_thread_end()} - -@findex @code{mysql_thread_end()} - -@code{void mysql_thread_end(void)} - -@subsubheading Description - -This function needs to be called before calling @code{pthread_exit()} to -free memory allocated by @code{mysql_thread_init()}. - -Note that this function @strong{is not invoked automatically} by the client -library. It must be called explicitly to avoid a memory leak. - -@subsubheading Return Values - -None. - -@node mysql_thread_safe, , mysql_thread_end, C Thread functions -@subsubsection @code{mysql_thread_safe()} - -@findex @code{mysql_thread_safe()} - -@code{unsigned int mysql_thread_safe(void)} - -@subsubheading Description - -This function indicates whether the client is compiled as thread-safe. - -@subsubheading Return Values - -1 is the client is thread-safe, 0 otherwise. - -@node C Embedded Server func, C API problems, C Thread functions, C -@subsection C Embedded Server Function Descriptions - -You must use the following functions if you want to allow your -application to be linked against the embedded MySQL server library. -@xref{libmysqld}. - -If the program is linked with @code{-lmysqlclient} instead of -@code{-lmysqld}, these functions do nothing. This makes it -possible to choose between using the embedded MySQL server and -a stand-alone server without modifying any code. - -@menu -* mysql_server_init:: @code{mysql_server_init()} -* mysql_server_end:: @code{mysql_server_end()} -@end menu - -@node mysql_server_init, mysql_server_end, C Embedded Server func, C Embedded Server func -@subsubsection @code{mysql_server_init()} - -@findex @code{mysql_server_init()} - -@code{int mysql_server_init(int argc, char **argv, char **groups)} - -@subsubheading Description - -This function @strong{must} be called once in the program before -calling any other MySQL function. It starts up the server and -initialises any subsystems (@code{mysys}, InnoDB, etc.) that the -server uses. If this function is not called, the program will -crash. If you are using the DBUG package that comes with MySQL, -you should call this after you have called @code{MY_INIT()}. - -The @code{argc} and @code{argv} arguments are analogous to the -arguments to @code{main()}. The first element of @code{argv} -is ignored (it typically contains the program name). For -convenience, @code{argc} may be @code{0} (zero) if there are no -command-line arguments for the server. - -The @code{NULL}-terminated list of strings in @code{groups} -selects which groups in the option files will be active. -@xref{Option files}. For convenience, @code{groups} may be -@code{NULL}, in which case the @code{[server]} and @code{[emedded]} groups -will be active. - -@subsubheading Example - -@example -#include <mysql.h> -#include <stdlib.h> - -static char *server_args[] = @{ - "this_program", /* this string is not used */ - "--datadir=.", - "--key_buffer_size=32M" -@}; -static char *server_groups[] = @{ - "embedded", - "server", - "this_program_SERVER", - (char *)NULL -@}; - -int main(void) @{ - mysql_server_init(sizeof(server_args) / sizeof(char *), - server_args, server_groups); - - /* Use any MySQL API functions here */ - - mysql_server_end(); - - return EXIT_SUCCESS; -@} -@end example - -@subsubheading Return Values - -0 if okay, 1 if an error occurred. - -@node mysql_server_end, , mysql_server_init, C Embedded Server func -@subsubsection @code{mysql_server_end()} - -@findex @code{mysql_server_end()} - -@code{void mysql_server_end(void)} - -@subsubheading Description - -This function @strong{must} be called once in the program after -all other MySQL functions. It shuts down the embedded server. - -@subsubheading Return Values - -None. - -@node C API problems, Building clients, C Embedded Server func, C -@subsection Common questions and problems when using the C API - -@tindex @code{mysql_query()} -@tindex @code{mysql_store_result()} - -@menu -* NULL mysql_store_result:: Why Is It that After @code{mysql_query()} Returns Success, @code{mysql_store_result()} Sometimes Returns @code{NULL}? -* Query results:: What Results Can I Get From a Query? -* Getting unique ID:: How Can I Get the Unique ID for the Last Inserted Row? -* C API linking problems:: Problems Linking with the C API -@end menu - - -@node NULL mysql_store_result, Query results, C API problems, C API problems -@subsubsection Why Is It that After @code{mysql_query()} Returns Success, @code{mysql_store_result()} Sometimes Returns @code{NULL}? - -It is possible for @code{mysql_store_result()} to return @code{NULL} -following a successful call to @code{mysql_query()}. When this happens, it -means one of the following conditions occurred: - -@itemize @bullet -@item -There was a @code{malloc()} failure (for example, if the result set was too -large). - -@item -The data couldn't be read (an error occurred on the connection). - -@item -The query returned no data (for example, it was an @code{INSERT}, -@code{UPDATE}, or @code{DELETE}). -@end itemize - -You can always check whether the statement should have produced a -non-empty result by calling @code{mysql_field_count()}. If -@code{mysql_field_count()} returns zero, the result is empty and the last -query was a statement that does not return values (for example, an -@code{INSERT} or a @code{DELETE}). If @code{mysql_field_count()} returns a -non-zero value, the statement should have produced a non-empty result. -See the description of the @code{mysql_field_count()} function for an -example. - -You can test for an error by calling @code{mysql_error()} or -@code{mysql_errno()}. - -@node Query results, Getting unique ID, NULL mysql_store_result, C API problems -@subsubsection What Results Can I Get From a Query? - -In addition to the result set returned by a query, you can also get the -following information: - -@itemize @bullet -@item -@code{mysql_affected_rows()} returns the number of rows affected by the last -query when doing an @code{INSERT}, @code{UPDATE}, or @code{DELETE}. An -exception is that if @code{DELETE} is used without a @code{WHERE} clause, the -table is re-created empty, which is much faster! In this case, -@code{mysql_affected_rows()} returns zero for the number of records -affected. - -@item -@code{mysql_num_rows()} returns the number of rows in a result set. With -@code{mysql_store_result()}, @code{mysql_num_rows()} may be called as soon as -@code{mysql_store_result()} returns. With @code{mysql_use_result()}, -@code{mysql_num_rows()} may be called only after you have fetched all the -rows with @code{mysql_fetch_row()}. - -@item -@code{mysql_insert_id()} returns the ID generated by the last -query that inserted a row into a table with an @code{AUTO_INCREMENT} index. -@xref{mysql_insert_id, , @code{mysql_insert_id()}}. - -@item -Some queries (@code{LOAD DATA INFILE ...}, @code{INSERT INTO -... SELECT ...}, @code{UPDATE}) return additional information. The result is -returned by @code{mysql_info()}. See the description for @code{mysql_info()} -for the format of the string that it returns. @code{mysql_info()} returns a -@code{NULL} pointer if there is no additional information. -@end itemize - - -@node Getting unique ID, C API linking problems, Query results, C API problems -@subsubsection How Can I Get the Unique ID for the Last Inserted Row? - -@cindex unique ID -@cindex last row, unique ID -@cindex ID, unique -@cindex tables, unique ID for last row - -If you insert a record in a table containing a column that has the -@code{AUTO_INCREMENT} attribute, you can get the most recently generated -ID by calling the @code{mysql_insert_id()} function. - -You can also retrieve the ID by using the @code{LAST_INSERT_ID()} function in -a query string that you pass to @code{mysql_query()}. - -You can check if an @code{AUTO_INCREMENT} index is used by executing -the following code. This also checks if the query was an @code{INSERT} with -an @code{AUTO_INCREMENT} index: - -@example -if (mysql_error(&mysql)[0] == 0 && - mysql_num_fields(result) == 0 && - mysql_insert_id(&mysql) != 0) -@{ - used_id = mysql_insert_id(&mysql); -@} -@end example - -The most recently generated ID is maintained in the server on a -per-connection basis. It will not be changed by another client. It will not -even be changed if you update another @code{AUTO_INCREMENT} column with a -non-magic value (that is, a value that is not @code{NULL} and not @code{0}). - -If you want to use the ID that was generated for one table and insert -it into a second table, you can use SQL statements like this: - -@example -INSERT INTO foo (auto,text) - VALUES(NULL,'text'); # generate ID by inserting NULL -INSERT INTO foo2 (id,text) - VALUES(LAST_INSERT_ID(),'text'); # use ID in second table -@end example - - -@node C API linking problems, , Getting unique ID, C API problems -@subsubsection Problems Linking with the C API - -@cindex linking, problems -@cindex C API, linking problems - -When linking with the C API, the following errors may occur on some systems: - -@example -gcc -g -o client test.o -L/usr/local/lib/mysql -lmysqlclient -lsocket -lnsl - -Undefined first referenced - symbol in file -floor /usr/local/lib/mysql/libmysqlclient.a(password.o) -ld: fatal: Symbol referencing errors. No output written to client -@end example - -If this happens on your system, you must include the math library by -adding @code{-lm} to the end of the compile/link line. - - -@node Building clients, Threaded clients, C API problems, C -@subsection Building Client Programs - -@cindex client programs, building -@cindex linking -@cindex building, client programs -@cindex programs, client - -If you compile MySQL clients that you've written yourself or that -you obtain from a third-party, they must be linked using the -@code{-lmysqlclient -lz} option on the link command. You may also need to -specify a @code{-L} option to tell the linker where to find the library. For -example, if the library is installed in @file{/usr/local/mysql/lib}, use -@code{-L/usr/local/mysql/lib -lmysqlclient -lz} on the link command. - -For clients that use MySQL header files, you may need to specify a -@code{-I} option when you compile them (for example, -@code{-I/usr/local/mysql/include}), so the compiler can find the header -files. - - -@node Threaded clients, libmysqld, Building clients, C -@subsection How to Make a Threaded Client - -@cindex clients, threaded -@cindex threaded clients - -The client library is almost thread-safe. The biggest problem is -that the subroutines in @file{net.c} that read from sockets are not -interrupt safe. This was done with the thought that you might want to -have your own alarm that can break a long read to a server. If you -install interrupt handlers for the @code{SIGPIPE} interrupt, -the socket handling should be thread-safe. - -In the older binaries we distribute on our web site -(@uref{http://www.mysql.com/}), the client libraries are not normally -compiled with the thread-safe option (the Windows binaries are by -default compiled to be thread-safe). Newer binary distributions should -have both a normal and a thread-safe client library. - -To get a threaded client where you can interrupt the client from other -threads and set timeouts when talking with the MySQL server, you should -use the @code{-lmysys}, @code{-lmystrings}, and @code{-ldbug} libraries and -the @code{net_serv.o} code that the server uses. - -If you don't need interrupts or timeouts, you can just compile a -thread-safe client library @code{(mysqlclient_r)} and use this. @xref{C,, -MySQL C API}. In this case you don't have to worry about the -@code{net_serv.o} object file or the other MySQL libraries. - -When using a threaded client and you want to use timeouts and -interrupts, you can make great use of the routines in the -@file{thr_alarm.c} file. If you are using routines from the -@code{mysys} library, the only thing you must remember is to call -@code{my_init()} first! @xref{C Thread functions}. - -All functions except @code{mysql_real_connect()} are by default -thread-safe. The following notes describe how to compile a thread-safe -client library and use it in a thread-safe manner. (The notes below for -@code{mysql_real_connect()} actually apply to @code{mysql_connect()} as -well, but because @code{mysql_connect()} is deprecated, you should be -using @code{mysql_real_connect()} anyway.) - -To make @code{mysql_real_connect()} thread-safe, you must recompile the -client library with this command: - -@example -shell> ./configure --enable-thread-safe-client -@end example - -This will create a thread-safe client library @code{libmysqlclient_r}. -(Assuming your OS has a thread-safe @code{gethostbyname_r()} function.) -This library is thread-safe per connection. You can let two threads -share the same connection with the following caveats: - -@itemize @bullet -@item -Two threads can't send a query to the MySQL server at the same time on -the same connection. In particular, you have to ensure that between a -@code{mysql_query()} and @code{mysql_store_result()} no other thread is using -the same connection. -@item -Many threads can access different result sets that are retrieved with -@code{mysql_store_result()}. -@item -If you use @code{mysql_use_result}, you have to ensure that no other thread -is using the same connection until the result set is closed. -However, it really is best for threaded clients that share the same -connection to use @code{mysql_store_result()}. -@item -If you want to use multiple threads on the same connection, you must -have a mutex lock around your @code{mysql_query()} and -@code{mysql_store_result()} call combination. Once -@code{mysql_store_result()} is ready, the lock can be released and other -threads may query the same connection. -@item -If you program with POSIX threads, you can use -@code{pthread_mutex_lock()} and @code{pthread_mutex_unlock()} to -establish and release a mutex lock. -@end itemize - -You need to know the following if you have a thread that is calling -MySQL functions which did not create the connection to the -MySQL database: - -When you call @code{mysql_init()} or @code{mysql_connect()}, MySQL will -create a thread-specific variable for the thread that is used by the -debug library (among other things). - -If you call a MySQL function, before the thread has -called @code{mysql_init()} or @code{mysql_connect()}, the thread will -not have the necessary thread-specific variables in place and you are -likely to end up with a core dump sooner or later. - -The get things to work smoothly you have to do the following: - -@enumerate -@item -Call @code{my_init()} at the start of your program if it calls -any other MySQL function before calling @code{mysql_real_connect()}. -@item -Call @code{mysql_thread_init()} in the thread handler before calling -any MySQL function. -@item -In the thread, call @code{mysql_thread_end()} before calling -@code{pthread_exit()}. This will free the memory used by MySQL -thread-specific variables. -@end enumerate - -You may get some errors because of undefined symbols when linking your -client with @code{libmysqlclient_r}. In most cases this is because you haven't -included the thread libraries on the link/compile line. - -@node libmysqld, , Threaded clients, C -@subsection libmysqld, the Embedded MySQL Server Library - -@cindex libmysqld -@cindex embedded MySQL server library - -@menu -* libmysqld overview:: Overview of the Embedded MySQL Server Library -* libmysqld compiling:: Compiling Programs with @code{libmysqld} -* libmysqld restrictions:: Restrictions when Using the Embedded MySQL Server -* libmysqld options:: Using Option Files with the Embedded Server -* libmysqld TODO:: Things left to do in Embedded Server (TODO) -* libmysqld example:: A Simple Embedded Server Example -* libmysqld licensing:: Licensing the Embedded Server -@end menu - -@node libmysqld overview, libmysqld compiling, libmysqld, libmysqld -@subsubsection Overview of the Embedded MySQL Server Library - -The embedded MySQL server library makes it possible to run a -full-featured MySQL server inside the client application. The -main benefits are increased speed and more simple management for -embedded applications. - -The API is identical for the embedded MySQL version and the -client/server version. To change an old threaded application to use the -embedded library, you normally only have to add calls to the following -functions: - -@multitable @columnfractions .25 .70 -@item @strong{Function} @tab @strong{When to call} -@item @code{mysql_server_init()} @tab Should be called before any other MySQL function is called, preferably early in the @code{main()} function. -@item @code{mysql_server_end()} @tab Should be called before your program exits. -@item @code{mysql_thread_init()} @tab Should be called in each thread you create that will access MySQL. -@item @code{mysql_thread_end()} @tab Should be called before calling @code{pthread_exit()} -@end multitable - -Then you must link your code with @file{libmysqld.a} instead of @file{libmysqlclient.a}. - -The above @code{mysql_server_xxx} functions are also included in -@file{libmysqlclient.a} to allow you to change between the embedded and the -client/server version by just linking your application with the right -library. @xref{mysql_server_init}. - - -@node libmysqld compiling, libmysqld restrictions, libmysqld overview, libmysqld -@subsubsection Compiling Programs with @code{libmysqld} - -To get a @code{libmysqld} library you should configure MySQL with the -@code{--with-embedded-server} option. - -When you link your program with @code{libmysqld}, you must also include -the system-specific @code{pthread} libraries and some libraries that -the MySQL server uses. You can get the full list of libraries by executing -@code{mysql_config --libmysqld-libs}. - -The correct flags for compiling and linking a threaded program -must be used, even if you do not directly call any thread -functions in your code. - -@node libmysqld restrictions, libmysqld options, libmysqld compiling, libmysqld -@subsubsection Restrictions when using the Embedded MySQL Server - -The embedded server has the following limitations: - -@itemize @bullet -@item -No support for ISAM tables. (This is mainly done to make the library smaller) -@item -No UDF functions. -@item -No stack trace on core dump. -@item -No internal RAID support. (This is not normally needed as most OS has -nowadays support for big files). -@item -You can set this up as a server or a master (no replication). -@item -You can't connect to the embedded server from an outside process with -sockets or TCP/IP. -@end itemize - -Some of these limitations can be changed by editing the @file{mysql_embed.h} -include file and recompiling MySQL. - -@node libmysqld options, libmysqld TODO, libmysqld restrictions, libmysqld -@subsubsection Using Option Files with the Embedded Server - -@cindex defaults, embedded - -The following is the recommended way to use option files to make it easy -to switch between a client/server application and one where MySQL is -embedded. @xref{Option files}. - -@itemize @bullet -@item -Put common options in the @code{[server]} section. These will be read by -both MySQL versions. -@item -Put client/server-specific options in the @code{[mysqld]} section. -@item -Put embedded MySQL-specific options in the @code{[embedded]} section. -@item -Put application-specific options in a @code{[ApplicationName_SERVER]} -section. -@end itemize - -@node libmysqld TODO, libmysqld example, libmysqld options, libmysqld -@subsubsection Things left to do in Embedded Server (TODO) - -@cindex TODO, embedded server - -@itemize @bullet -@item -Currently we only provide a static version of the @code{mysqld} library, -in the future we will also provide a shared library for this. -@item -We are going to provide options to leave out some parts of MySQL to make -the library smaller. -@item -There is still a lot of speed optimisation to do. -@item -Errors are written to stderr. We will add an option to specify a -filename for these. -@item -We have to change InnoDB to not be so verbose when using in the embedded -version. -@end itemize - - -@node libmysqld example, libmysqld licensing, libmysqld TODO, libmysqld -@subsubsection A Simple Embedded Server Example - -This example program and makefile should work without any -changes on a Linux or FreeBSD system. For other operating -systems, minor changes will be needed. This example is -designed to give enough details to understand the problem, -without the clutter that is a necessary part of a real -application. - -To try out the example, create an @file{test_libmysqld} directory -at the same level as the mysql-4.0 source directory. Save -the @file{test_libmysqld.c} source and the @file{GNUmakefile} in the -directory, and run GNU @file{make} from inside the @file{test_libmysqld} -directory. - -@file{test_libmysqld.c} -@example -/* - * A simple example client, using the embedded MySQL server library - */ - -#include <mysql.h> -#include <stdarg.h> -#include <stdio.h> -#include <stdlib.h> - -MYSQL *db_connect(const char *dbname); -void db_disconnect(MYSQL *db); -void db_do_query(MYSQL *db, const char *query); - -const char *server_groups[] = @{ - "test_libmysqld_SERVER", "embedded", "server", NULL -@}; - -int -main(int argc, char **argv) -@{ - MYSQL *one, *two; - - /* mysql_server_init() must be called before any other mysql - * functions. - * - * You can use mysql_server_init(0, NULL, NULL), and it will - * initialise the server using groups = @{ - * "server", "embedded", NULL - * @}. - * - * In your $HOME/.my.cnf file, you probably want to put: - -[test_libmysqld_SERVER] -language = /path/to/source/of/mysql/sql/share/english - - * You could, of course, modify argc and argv before passing - * them to this function. Or you could create new ones in any - * way you like. But all of the arguments in argv (except for - * argv[0], which is the program name) should be valid options - * for the MySQL server. - * - * If you link this client against the normal mysqlclient - * library, this function is just a stub that does nothing. - */ - mysql_server_init(argc, argv, (char **)server_groups); - - one = db_connect("test"); - two = db_connect(NULL); - - db_do_query(one, "SHOW TABLE STATUS"); - db_do_query(two, "SHOW DATABASES"); - - mysql_close(two); - mysql_close(one); - - /* This must be called after all other mysql functions */ - mysql_server_end(); - - exit(EXIT_SUCCESS); -@} - -static void -die(MYSQL *db, char *fmt, ...) -@{ - va_list ap; - va_start(ap, fmt); - vfprintf(stderr, fmt, ap); - va_end(ap); - (void)putc('\n', stderr); - if (db) - db_disconnect(db); - exit(EXIT_FAILURE); -@} - -MYSQL * -db_connect(const char *dbname) -@{ - MYSQL *db = mysql_init(NULL); - if (!db) - die(db, "mysql_init failed: no memory"); - /* - * Notice that the client and server use separate group names. - * This is critical, because the server will not accept the - * client's options, and vice versa. - */ - mysql_options(db, MYSQL_READ_DEFAULT_GROUP, "test_libmysqld_CLIENT"); - if (!mysql_real_connect(db, NULL, NULL, NULL, dbname, 0, NULL, 0)) - die(db, "mysql_real_connect failed: %s", mysql_error(db)); - - return db; -@} - -void -db_disconnect(MYSQL *db) -@{ - mysql_close(db); -@} - -void -db_do_query(MYSQL *db, const char *query) -@{ - if (mysql_query(db, query) != 0) - goto err; - - if (mysql_field_count(db) > 0) - @{ - MYSQL_RES *res; - MYSQL_ROW row, end_row; - int num_fields; - - if (!(res = mysql_store_result(db))) - goto err; - num_fields = mysql_num_fields(res); - while ((row = mysql_fetch_row(res))) - @{ - (void)fputs(">> ", stdout); - for (end_row = row + num_fields; row < end_row; ++row) - (void)printf("%s\t", row ? (char*)*row : "NULL"); - (void)fputc('\n', stdout); - @} - (void)fputc('\n', stdout); - @} - else - (void)printf("Affected rows: %lld\n", mysql_affected_rows(db)); - - return; - -err: - die(db, "db_do_query failed: %s [%s]", mysql_error(db), query); -@} -@end example - -@file{GNUmakefile} -@example -# This assumes the MySQL software is installed in /usr/local/mysql -inc := /usr/local/mysql/include/mysql -lib := /usr/local/mysql/lib - -# If you have not installed the MySQL software yet, try this instead -#inc := $(HOME)/mysql-4.0/include -#lib := $(HOME)/mysql-4.0/libmysqld - -CC := gcc -CPPFLAGS := -I$(inc) -D_THREAD_SAFE -D_REENTRANT -CFLAGS := -g -W -Wall -LDFLAGS := -static -# You can change -lmysqld to -lmysqlclient to use the -# client/server library -LDLIBS = -L$(lib) -lmysqld -lz -lm -lcrypt - -ifneq (,$(shell grep FreeBSD /COPYRIGHT 2>/dev/null)) -# FreeBSD -LDFLAGS += -pthread -else -# Assume Linux -LDLIBS += -lpthread -endif - -# This works for simple one-file test programs -sources := $(wildcard *.c) -objects := $(patsubst %c,%o,$(sources)) -targets := $(basename $(sources)) - -all: $(targets) - -clean: - rm -f $(targets) $(objects) *.core -@end example - -@node libmysqld licensing, , libmysqld example, libmysqld -@subsubsection Licensing the Embedded Server - -The MySQL source code is covered by the GNU GPL license -(@pxref{GPL license}). One result of this is that any program -which includes, by linking with @code{libmysqld}, the MySQL -source code must be released as free software (under a license -compatible with the GPL). - -We encourage everyone to promote free software by releasing -code under the GPL or a compatible license. For those who -are not able to do this, another option is to purchase a -commercial licence for the MySQL code from MySQL AB. -For details, please see @ref{MySQL licenses}. - -@node Cplusplus, Java, C, Clients -@section MySQL C++ APIs - -@menu -* Borland C++:: Borland C++ -@end menu - - -@cindex C++ APIs - -Two APIs are available in the MySQL Contrib directory -(@uref{http://www.mysql.com/Downloads/Contrib/}). - - -@node Borland C++, , Cplusplus, Cplusplus -@subsection Borland C++ - -@cindex Borland C++ compiler - -You can compile the MySQL Windows source with Borland C++ 5.02. -(The Windows source includes only projects for Microsoft VC++, for -Borland C++ you have to do the project files yourself.) - -One known problem with Borland C++ is that it uses a different structure -alignment than VC++. This means that you will run into problems if you -try to use the default @code{libmysql.dll} libraries (that was compiled -with VC++) with Borland C++. You can do one of the following to avoid -this problem. - -@itemize @bullet -@item -You can use the static MySQL libraries for Borland C++ that you -can find on @uref{http://www.mysql.com/downloads/os-win32.html}. -@item -Only call @code{mysql_init()} with @code{NULL} as an argument, not a -pre-allocated MYSQL struct. -@end itemize - - -@node Java, Python, Cplusplus, Clients -@section MySQL Java Connectivity (JDBC) - -@cindex Java connectivity -@cindex JDBC - -There are 2 supported JDBC drivers for MySQL (the mm driver and -the Reisin JDBC driver). You can find a copy of the mm driver at -@uref{http://mmmysql.sourceforge.net/} or -@uref{http://www.mysql.com/Downloads/Contrib/} and the Reisin driver at -@uref{http://www.caucho.com/projects/jdbc-mysql/index.xtp} For -documentation consult any JDBC documentation and the driver's own -documentation for MySQL-specific features. - - -@node Python, Tcl, Java, Clients -@section MySQL Python APIs - -@cindex Python APIs - -The MySQL Contrib directory -(@uref{http://www.mysql.com/Downloads/Contrib/}) -contains a Python interface written by Joseph Skinner. - - -@node Tcl, Eiffel, Python, Clients -@section MySQL Tcl APIs - -@cindex Tcl APIs - -@uref{http://www.binevolve.com/~tdarugar/tcl-sql/} (Tcl at binevolve). -The Contrib directory -(@uref{http://www.mysql.com/Downloads/Contrib/}) contains a Tcl -interface that is based on msqltcl 1.50. - - -@node Eiffel, , Tcl, Clients -@section MySQL Eiffel wrapper - -@cindex Eiffel Wrapper -@cindex wrappers, Eiffel - -The MySQL Contrib directory -(@uref{http://www.mysql.com/Downloads/Contrib/}) -contains an Eiffel wrapper written by Michael Ravits. - - -@node Extending MySQL, Problems, Clients, Top -@chapter Extending MySQL - -@menu -* MySQL internals:: MySQL Internals -* Adding functions:: Adding New Functions to MySQL -* Adding procedures:: Adding New Procedures to MySQL -@end menu - - -@node MySQL internals, Adding functions, Extending MySQL, Extending MySQL -@section MySQL Internals - -@cindex internals -@cindex threads - -This chapter describes a lot of things that you need to know when -working on the MySQL code. If you plan to contribute to MySQL -development, want to have access to the bleeding-edge in-between -versions code, or just want to keep track of development, follow the -instructions in @ref{Installing source tree}. -If you are interested in MySQL internals, you should also subscribe -to our @code{internals} mailing list. This list is relatively low -traffic. For details on how to subscribe, please see -@ref{Mailing-list}. -All developers at MySQL AB are on the @code{internals} list and we -help other people who are working on the MySQL code. Feel free to -use this list both to ask questions about the code and to send -patches that you would like to contribute to the MySQL project! - -@menu -* MySQL threads:: MySQL threads -* MySQL test suite:: MySQL test suite -@end menu - - -@node MySQL threads, MySQL test suite, MySQL internals, MySQL internals -@subsection MySQL Threads - -The MySQL server creates the following threads: - -@itemize @bullet - -@item -The TCP/IP connection thread handles all connection requests and -creates a new dedicated thread to handle the authentication and -SQL query processing for each connection. - -@item -On Windows NT there is a named pipe handler thread that does the same work as -the TCP/IP connection thread on named pipe connect requests. - -@item -The signal thread handles all signals. This thread also normally handles -alarms and calls @code{process_alarm()} to force timeouts on connections -that have been idle too long. - -@item -If @code{mysqld} is compiled with @code{-DUSE_ALARM_THREAD}, a dedicated -thread that handles alarms is created. This is only used on some systems where -there are problems with @code{sigwait()} or if one wants to use the -@code{thr_alarm()} code in ones application without a dedicated signal -handling thread. - -@item -If one uses the @code{--flush_time=#} option, a dedicated thread is created -to flush all tables at the given interval. - -@item -Every connection has its own thread. - -@item -Every different table on which one uses @code{INSERT DELAYED} gets its -own thread. - -@item -If you use @code{--master-host}, a slave replication thread will be -started to read and apply updates from the master. -@end itemize - -@code{mysqladmin processlist} only shows the connection, @code{INSERT DELAYED}, -and replication threads. - - -@node MySQL test suite, , MySQL threads, MySQL internals -@subsection MySQL Test Suite - -@cindex mysqltest, MySQL Test Suite -@cindex testing mysqld, mysqltest - -Until recently, our main full-coverage test suite was based on proprietary -customer data and for that reason has not been publicly available. The only -publicly available part of our testing process consisted of the @code{crash-me} -test, a Perl DBI/DBD benchmark found in the @code{sql-bench} directory, and -miscellaneous tests located in @code{tests} directory. The lack of a -standardised publicly available test suite has made it difficult for our users, -as well developers, to do regression tests on the MySQL code. To -address this problem, we have created a new test system that is included in -the source and binary distributions starting in Version 3.23.29. - -The current set of test cases doesn't test everything in MySQL, but it -should catch most obvious bugs in the SQL processing code, OS/library -issues, and is quite thorough in testing replication. Our eventual goal -is to have the tests cover 100% of the code. We welcome contributions -to our test suite. You may especially want to contribute tests that -examine the functionality critical to your system, as this will ensure -that all future MySQL releases will work well with your -applications. - -@menu -* running mysqltest:: Running the MySQL Test Suite -* extending mysqltest:: Extending the MySQL Test Suite -* Reporting mysqltest bugs:: Reporting Bugs in the MySQL Test Suite -@end menu - - -@node running mysqltest, extending mysqltest, MySQL test suite, MySQL test suite -@subsubsection Running the MySQL Test Suite - -The test system consist of a test language interpreter -(@code{mysqltest}), a shell script to run all -tests(@code{mysql-test-run}), the actual test cases written in a special -test language, and their expected results. To run the test suite on -your system after a build, type @code{make test} or -@code{mysql-test/mysql-test-run} from the source root. If you have -installed a binary distribution, @code{cd} to the install root -(eg. @code{/usr/local/mysql}), and do @code{scripts/mysql-test-run}. -All tests should succeed. If not, you should try to find out why and -report the problem if this is a bug in MySQL. -@xref{Reporting mysqltest bugs}. - -If you have a copy of @code{mysqld} running on the machine where you want to -run the test suite you do not have to stop it, as long as it is not using -ports @code{9306} and @code{9307}. If one of those ports is taken, you should -edit @code{mysql-test-run} and change the values of the master and/or slave -port to one that is available. - -You can run one individual test case with -@code{mysql-test/mysql-test-run test_name}. - -If one test fails, you should test running @code{mysql-test-run} with -the @code{--force} option to check if any other tests fails. - - -@node extending mysqltest, Reporting mysqltest bugs, running mysqltest, MySQL test suite -@subsubsection Extending the MySQL Test Suite - -You can use the @code{mysqltest} language to write your own test cases. -Unfortunately, we have not yet written full documentation for it - we plan to -do this shortly. You can, however, look at our current test cases and use -them as an example. The following points should help you get started: - -@itemize @bullet -@item -The tests are located in @code{mysql-test/t/*.test} - -@item -A test case consists of @code{;} terminated statements and is similar to the -input of @code{mysql} command-line client. A statement by default is a query -to be sent to MySQL server, unless it is recognised as internal -command (eg. @code{sleep}). - -@item -All queries that produce results@-e.g., @code{SELECT}, @code{SHOW}, -@code{EXPLAIN}, etc., must be preceded with @code{@@/path/to/result/file}. The -file must contain the expected results. An easy way to generate the result -file is to run @code{mysqltest -r < t/test-case-name.test} from -@code{mysql-test} directory, and then edit the generated result files, if -needed, to adjust them to the expected output. In that case, be very careful -about not adding or deleting any invisible characters - make sure to only -change the text and/or delete lines. If you have to insert a line, make sure -the fields are separated with a hard tab, and there is a hard tab at the end. -You may want to use @code{od -c} to make sure your text editor has not messed -anything up during edit. We, of course, hope that you will never have to edit -the output of @code{mysqltest -r} as you only have to do it when you find a -bug. - -@item -To be consistent with our setup, you should put your result files in -@code{mysql-test/r} directory and name them @code{test_name.result}. If the -test produces more than one result, you should use @code{test_name.a.result}, -@code{test_name.b.result}, etc. - -@item -If a statement returns an error, you should on the line before the statement -specify with the @code{--error error-number}. The error number can be -a list of possible error numbers separated with @code{','}. - -@item -If you are writing a replication test case, you should on the first line of -the test file, put @code{source include/master-slave.inc;}. To switch between -master and slave, use @code{connection master;} and @code{connection slave;}. -If you need to do something on an alternate connection, you can do -@code{connection master1;} for the master, and @code{connection slave1;} for -the slave. - -@item -If you need to do something in a loop, you can use something like this: -@example -let $1=1000; -while ($1) -@{ - # do your queries here - dec $1; -@} -@end example - -@item -To sleep between queries, use the @code{sleep} command. It supports fractions -of a second, so you can do @code{sleep 1.3;}, for example, to sleep 1.3 -seconds. - -@item -To run the slave with additional options for your test case, put them -in the command-line format in @code{mysql-test/t/test_name-slave.opt}. For -the master, put them in @code{mysql-test/t/test_name-master.opt}. - -@item -If you have a question about the test suite, or have a test case to contribute, -e-mail to @email{internals@@lists.mysql.com}. As the list does not accept -attachments, you should ftp all the relevant files to: -@uref{ftp://support.mysql.com/pub/mysql/Incoming/} - -@end itemize - - -@node Reporting mysqltest bugs, , extending mysqltest, MySQL test suite -@subsubsection Reporting Bugs in the MySQL Test Suite - -If your MySQL version doesn't pass the test suite you should -do the following: - -@itemize @bullet -@item -Don't send a bug report before you have found out as much as possible of -what when wrong! When you do it, please use the @code{mysqlbug} script -so that we can get information about your system and @code{MySQL} -version. @xref{Bug reports}. -@item -Make sure to include the output of @code{mysql-test-run}, as well as -contents of all @code{.reject} files in @code{mysql-test/r} directory. -@item -If a test in the test suite fails, check if the test fails also when run -by its own: - -@example -cd mysql-test -mysql-test-run --local test-name -@end example - -If this fails, then you should configure MySQL with -@code{--with-debug} and run @code{mysql-test-run} with the -@code{--debug} option. If this also fails send the trace file -@file{var/tmp/master.trace} to ftp://support.mysql.com/pub/mysql/secret -so that we can examine it. Please remember to also include a full -description of your system, the version of the mysqld binary and how you -compiled it. - -@item -Try also to run @code{mysql-test-run} with the @code{--force} option to -see if there is any other test that fails. - -@item -If you have compiled MySQL yourself, check our manual for how -to compile MySQL on your platform or, preferable, use one of -the binaries we have compiled for you at -@uref{http://www.mysql.com/downloads/}. All our standard binaries should -pass the test suite ! - -@item -If you get an error, like @code{Result length mismatch} or @code{Result -content mismatch} it means that the output of the test didn't match -exactly the expected output. This could be a bug in MySQL or -that your mysqld version produces slight different results under some -circumstances. - -Failed test results are put in a file with the same base name as the -result file with the @code{.reject} extension. If your test case is -failing, you should do a diff on the two files. If you cannot see how -they are different, examine both with @code{od -c} and also check their -lengths. - -@item -If a test fails totally, you should check the logs file in the -@code{mysql-test/var/log} directory for hints of what went wrong. - -@item -If you have compiled MySQL with debugging you can try to debug this -by running @code{mysql-test-run} with the @code{--gdb} and/or @code{--debug} -options. -@xref{Making trace files}. - -If you have not compiled MySQL for debugging you should probably -do that. Just specify the @code{--with-debug} options to @code{configure}! -@xref{Installing source}. -@end itemize - - -@node Adding functions, Adding procedures, MySQL internals, Extending MySQL -@section Adding New Functions to MySQL - -@cindex functions, new -@cindex adding, new functions -@cindex user-defined functions, adding -@cindex UDFs, defined -@cindex functions, user-defined - -There are two ways to add new functions to MySQL: - -@itemize @bullet -@item You can add the function through the user-definable function (UDF) -interface. User-definable functions are added and removed dynamically using -the @code{CREATE FUNCTION} and @code{DROP FUNCTION} statements. -@xref{CREATE FUNCTION, , @code{CREATE FUNCTION}}. - -@item You can add the function as a native (built in) MySQL function. -Native functions are compiled into the @code{mysqld} server and become -available on a permanent basis. -@end itemize - -Each method has advantages and disadvantages: - -@itemize @bullet -@item -If you write a user-definable function, you must install the object file -in addition to the server itself. If you compile your function into the -server, you don't need to do that. -@item -You can add UDFs to a binary MySQL distribution. Native functions -require you to modify a source distribution. -@item -If you upgrade your MySQL distribution, you can continue to use your -previously installed UDFs. For native functions, you must repeat your -modifications each time you upgrade. -@end itemize - -Whichever method you use to add new functions, they may be used just like -native functions such as @code{ABS()} or @code{SOUNDEX()}. - -@menu -* CREATE FUNCTION:: @code{CREATE FUNCTION/DROP FUNCTION} Syntax -* Adding UDF:: Adding a new user-definable function -* Adding native function:: Adding a new native function -@end menu - - -@node CREATE FUNCTION, Adding UDF, Adding functions, Adding functions -@subsection @code{CREATE FUNCTION/DROP FUNCTION} Syntax - -@findex CREATE FUNCTION -@findex DROP FUNCTION -@cindex deleting, function -@cindex function, deleting -@findex UDF functions -@findex User-defined functions -@findex Functions, user-defined - -@example -CREATE [AGGREGATE] FUNCTION function_name RETURNS @{STRING|REAL|INTEGER@} - SONAME shared_library_name - -DROP FUNCTION function_name -@end example - -A user-definable function (UDF) is a way to extend MySQL with a new -function that works like native (built in) MySQL functions such as -@code{ABS()} and @code{CONCAT()}. - -@code{AGGREGATE} is a new option for MySQL Version 3.23. An -@code{AGGREGATE} function works exactly like a native MySQL -@code{GROUP} function like @code{SUM} or @code{COUNT()}. - -@code{CREATE FUNCTION} saves the function's name, type, and shared library -name in the @code{mysql.func} system table. You must have the -@code{INSERT} and @code{DELETE} privileges for the @code{mysql} database -to create and drop functions. - -All active functions are reloaded each time the server starts, unless -you start @code{mysqld} with the @code{--skip-grant-tables} option. In -this case, UDF initialisation is skipped and UDFs are unavailable. -(An active function is one that has been loaded with @code{CREATE FUNCTION} -and not removed with @code{DROP FUNCTION}.) - -For instructions on writing user-definable functions, see @ref{Adding -functions}. For the UDF mechanism to work, functions must be written in C or -C++, your operating system must support dynamic loading and you must have -compiled @code{mysqld} dynamically (not statically). - -Note that to make @code{AGGREGATE} work, you must have a -@code{mysql.func} table that contains the column @code{type}. If this -is not the case, you should run the script -@code{mysql_fix_privilege_tables} to get this fixed. - - -@node Adding UDF, Adding native function, CREATE FUNCTION, Adding functions -@subsection Adding a New User-definable Function - -@cindex adding, user-definable functions -@cindex user-defined functions, adding -@cindex functions, user-definable, adding - -@menu -* UDF calling:: UDF Calling Sequences -* UDF aggr. calling:: -* UDF arguments:: Argument Processing -* UDF return values:: Return Values and Error Handling -* UDF compiling:: Compiling and Installing User-definable Functions -@end menu - - -For the UDF mechanism to work, functions must be written in C or C++ and your -operating system must support dynamic loading. The MySQL source -distribution includes a file @file{sql/udf_example.cc} that defines 5 new -functions. Consult this file to see how UDF calling conventions work. - -For @code{mysqld} to be able to use UDF functions, you should configure MySQL -with @code{--with-mysqld-ldflags=-rdynamic} The reason is that to on -many platforms (including Linux) you can load a dynamic library (with -@code{dlopen()}) from a static linked program, which you would get if -you are using @code{--with-mysqld-ldflags=-all-static} If you want to -use an UDF that needs to access symbols from @code{mysqld} (like the -@code{methaphone} example in @file{sql/udf_example.cc} that uses -@code{default_charset_info}), you must link the program with -@code{-rdynamic} (see @code{man dlopen}). - -For each function that you want to use in SQL statements, you should define -corresponding C (or C++) functions. In the discussion below, the name -``xxx'' is used for an example function name. To distinquish between SQL and -C/C++ usage, @code{XXX()} (uppercase) indicates a SQL function call, and -@code{xxx()} (lowercase) indicates a C/C++ function call. - -The C/C++ functions that you write to implement the interface for -@code{XXX()} are: - -@table @asis -@item @code{xxx()} (required) -The main function. This is where the function result is computed. -The correspondence between the SQL type and return type of your C/C++ -function is shown here: - -@multitable @columnfractions .15 .15 -@item @strong{SQL type} @tab @strong{C/C++ type} -@item @code{STRING} @tab @code{char *} -@item @code{INTEGER} @tab @code{long long} -@item @code{REAL} @tab @code{double} -@end multitable - -@item @code{xxx_init()} (optional) -The initialisation function for @code{xxx()}. It can be used to: - -@itemize @bullet -@item -Check the number of arguments to @code{XXX()}. -@item -Check that the arguments are of a required type or, alternatively, -tell MySQL to coerce arguments to the types you want when -the main function is called. -@item -Allocate any memory required by the main function. -@item -Specify the maximum length of the result. -@item -Specify (for @code{REAL} functions) the maximum number of decimals. -@item -Specify whether the result can be @code{NULL}. -@end itemize - -@item @code{xxx_deinit()} (optional) -The deinitialisation function for @code{xxx()}. It should deallocate any -memory allocated by the initialisation function. -@end table - -When a SQL statement invokes @code{XXX()}, MySQL calls the -initialisation function @code{xxx_init()} to let it perform any required -setup, such as argument checking or memory allocation. If @code{xxx_init()} -returns an error, the SQL statement is aborted with an error message and the -main and deinitialisation functions are not called. Otherwise, the main -function @code{xxx()} is called once for each row. After all rows have been -processed, the deinitialisation function @code{xxx_deinit()} is called so it -can perform any required cleanup. - -For aggregate functions (like @code{SUM()}), you must also provide the -following functions: - -@table @asis -@item @code{xxx_reset()} (required) -Reset sum and insert the argument as the initial value for a new group. -@item @code{xxx_add()} (required) -Add the argument to the old sum. -@end table - -When using aggregate UDF functions MySQL works the following way: - -@enumerate -@item -Call @code{xxx_init()} to let the aggregate function allocate the memory it -will need to store results. -@item -Sort the table according to the @code{GROUP BY} expression. -@item -For the first row in a new group, call the @code{xxx_reset()} function. -@item -For each new row that belongs in the same group, call the -@code{xxx_add()} function. -@item -When the group changes or after the last row has been processed, -call @code{xxx()} to get the result for the aggregate. -@item -Repeat 3-5 until all rows has been processed -@item -Call @code{xxx_deinit()} to let the UDF free any memory it has allocated. -@end enumerate - -All functions must be thread-safe (not just the main function, -but the initialisation and deinitialisation functions as well). This means -that you are not allowed to allocate any global or static variables that -change! If you need memory, you should allocate it in @code{xxx_init()} -and free it in @code{xxx_deinit()}. - - -@node UDF calling, UDF aggr. calling, Adding UDF, Adding UDF -@subsubsection UDF Calling Sequences for simple functions - -@cindex calling sequences for simple functions, UDF - -The main function should be declared as shown here. Note that the return -type and parameters differ, depending on whether you will declare the SQL -function @code{XXX()} to return @code{STRING}, @code{INTEGER}, or @code{REAL} -in the @code{CREATE FUNCTION} statement: - -@noindent -For @code{STRING} functions: - -@example -char *xxx(UDF_INIT *initid, UDF_ARGS *args, - char *result, unsigned long *length, - char *is_null, char *error); -@end example - -@noindent -For @code{INTEGER} functions: - -@example -long long xxx(UDF_INIT *initid, UDF_ARGS *args, - char *is_null, char *error); -@end example - -@noindent -For @code{REAL} functions: - -@example -double xxx(UDF_INIT *initid, UDF_ARGS *args, - char *is_null, char *error); -@end example - -The initialisation and deinitialisation functions are declared like this: - -@example -my_bool xxx_init(UDF_INIT *initid, UDF_ARGS *args, char *message); - -void xxx_deinit(UDF_INIT *initid); -@end example - -The @code{initid} parameter is passed to all three functions. It points to a -@code{UDF_INIT} structure that is used to communicate information between -functions. The @code{UDF_INIT} structure members are listed below. The -initialisation function should fill in any members that it wishes to change. -(To use the default for a member, leave it unchanged.): - -@table @code -@item my_bool maybe_null -@code{xxx_init()} should set @code{maybe_null} to @code{1} if @code{xxx()} -can return @code{NULL}. The default value is @code{1} if any of the -arguments are declared @code{maybe_null}. - -@item unsigned int decimals -Number of decimals. The default value is the maximum number of decimals in -the arguments passed to the main function. (For example, if the function is -passed @code{1.34}, @code{1.345}, and @code{1.3}, the default would be 3, -because @code{1.345} has 3 decimals. - -@item unsigned int max_length -The maximum length of the string result. The default value differs depending -on the result type of the function. For string functions, the default is the -length of the longest argument. For integer functions, the default is 21 -digits. For real functions, the default is 13 plus the number of decimals -indicated by @code{initid->decimals}. (For numeric functions, the length -includes any sign or decimal point characters.) - -If you want to return a blob, you can set this to 65K or 16M; this -memory is not allocated but used to decide which column type to use if -there is a need to temporary store the data. - -@item char *ptr -A pointer that the function can use for its own purposes. For example, -functions can use @code{initid->ptr} to communicate allocated memory -between functions. In @code{xxx_init()}, allocate the memory and assign it -to this pointer: - -@example -initid->ptr = allocated_memory; -@end example - -In @code{xxx()} and @code{xxx_deinit()}, refer to @code{initid->ptr} to use -or deallocate the memory. -@end table - - -@node UDF aggr. calling, UDF arguments, UDF calling, Adding UDF -@subsubsection UDF Calling Sequences for aggregate functions - -@cindex calling sequences for aggregate functions, UDF - -Here follows a description of the different functions you need to define -when you want to create an aggregate UDF function. - -@example -char *xxx_reset(UDF_INIT *initid, UDF_ARGS *args, - char *is_null, char *error); -@end example - -This function is called when MySQL finds the first row in a new group. -In the function you should reset any internal summary variables and then set -the given argument as the first argument in the group. - -In many cases this is implemented internally by reseting all variables -and then calling @code{xxx_add()}. - -@example -char *xxx_add(UDF_INIT *initid, UDF_ARGS *args, - char *is_null, char *error); -@end example - -This function is called for all rows that belongs to the same group, -except for the first row. In this you should add the value in UDF_ARGS -to your internal summary variable. - -The @code{xxx()} function should be declared identical as when you -define a simple UDF function. @xref{UDF calling}. - -This function is called when all rows in the group has been processed. -You should normally never access the @code{args} variable here but -return your value based on your internal summary variables. - -All argument processing in @code{xxx_reset()} and @code{xxx_add()} -should be done identically as for normal UDF functions. @xref{UDF -arguments}. - -The return value handling in @code{xxx()} should be done identically as -for a normal UDF. @xref{UDF return values}. - -The pointer argument to @code{is_null} and @code{error} is the same for -all calls to @code{xxx_reset()}, @code{xxx_add()} and @code{xxx()}. -You can use this to remember that you got an error or if the @code{xxx()} -function should return @code{NULL}. Note that you should not store a string -into @code{*error}! This is just a 1 byte flag! - -@code{is_null} is reset for each group (before calling @code{xxx_reset()}. -@code{error} is never reset. - -If @code{isnull} or @code{error} are set after @code{xxx()} then MySQL -will return @code{NULL} as the result for the group function. - -@node UDF arguments, UDF return values, UDF aggr. calling, Adding UDF -@subsubsection Argument Processing - -@cindex argument processing -@cindex processing, arguments - -The @code{args} parameter points to a @code{UDF_ARGS} structure that has the -members listed here: - -@table @code -@item unsigned int arg_count -The number of arguments. Check this value in the initialisation function -if you want your function to be called with a particular number of arguments. -For example: - -@example -if (args->arg_count != 2) -@{ - strcpy(message,"XXX() requires two arguments"); - return 1; -@} -@end example - - -@item enum Item_result *arg_type -The types for each argument. The possible type values are -@code{STRING_RESULT}, @code{INT_RESULT}, and @code{REAL_RESULT}. - -To make sure that arguments are of a given type and return an -error if they are not, check the @code{arg_type} array in the initialisation -function. For example: - -@example -if (args->arg_type[0] != STRING_RESULT || - args->arg_type[1] != INT_RESULT) -@{ - strcpy(message,"XXX() requires a string and an integer"); - return 1; -@} -@end example - -As an alternative to requiring your function's arguments to be of particular -types, you can use the initialisation function to set the @code{arg_type} -elements to the types you want. This causes MySQL to coerce -arguments to those types for each call to @code{xxx()}. For example, to -specify coercion of the first two arguments to string and integer, do this in -@code{xxx_init()}: - -@example -args->arg_type[0] = STRING_RESULT; -args->arg_type[1] = INT_RESULT; -@end example - -@item char **args -@code{args->args} communicates information to the initialisation function -about the general nature of the arguments your function was called with. For a -constant argument @code{i}, @code{args->args[i]} points to the argument -value. (See below for instructions on how to access the value properly.) -For a non-constant argument, @code{args->args[i]} is @code{0}. -A constant argument is an expression that uses only constants, such as -@code{3} or @code{4*7-2} or @code{SIN(3.14)}. A non-constant argument is an -expression that refers to values that may change from row to row, such as -column names or functions that are called with non-constant arguments. - -For each invocation of the main function, @code{args->args} contains the -actual arguments that are passed for the row currently being processed. - -Functions can refer to an argument @code{i} as follows: - -@itemize @bullet -@item -An argument of type @code{STRING_RESULT} is given as a string pointer plus a -length, to allow handling of binary data or data of arbitrary length. The -string contents are available as @code{args->args[i]} and the string length -is @code{args->lengths[i]}. You should not assume that strings are -null-terminated. - -@item -For an argument of type @code{INT_RESULT}, you must cast -@code{args->args[i]} to a @code{long long} value: - -@example -long long int_val; -int_val = *((long long*) args->args[i]); -@end example - -@item -For an argument of type @code{REAL_RESULT}, you must cast -@code{args->args[i]} to a @code{double} value: - -@example -double real_val; -real_val = *((double*) args->args[i]); -@end example -@end itemize - -@item unsigned long *lengths -For the initialisation function, the @code{lengths} array indicates the -maximum string length for each argument. You should not change these. -For each invocation of the main function, @code{lengths} contains the -actual lengths of any string arguments that are passed for the row -currently being processed. For arguments of types @code{INT_RESULT} or -@code{REAL_RESULT}, @code{lengths} still contains the maximum length of -the argument (as for the initialisation function). -@end table - - -@node UDF return values, UDF compiling, UDF arguments, Adding UDF -@subsubsection Return Values and Error Handling - -@cindex UDFs, return values -@cindex return values, UDFs -@cindex errors, handling for UDFs -@cindex handling, errors - -The initialisation function should return @code{0} if no error occurred and -@code{1} otherwise. If an error occurs, @code{xxx_init()} should store a -null-terminated error message in the @code{message} parameter. The message -will be returned to the client. The message buffer is -@code{MYSQL_ERRMSG_SIZE} characters long, but you should try to keep the -message to less than 80 characters so that it fits the width of a standard -terminal screen. - -The return value of the main function @code{xxx()} is the function value, for -@code{long long} and @code{double} functions. A string functions should -return a pointer to the result and store the length of the string in the -@code{length} arguments. - -Set these to the contents and length of the return value. For example: - -@example -memcpy(result, "result string", 13); -*length = 13; -@end example - -The @code{result} buffer that is passed to the calc function is 255 byte -big. If your result fits in this, you don't have to worry about memory -allocation for results. - -If your string function needs to return a string longer than 255 bytes, -you must allocate the space for it with @code{malloc()} in your -@code{xxx_init()} function or your @code{xxx()} function and free it in -your @code{xxx_deinit()} function. You can store the allocated memory -in the @code{ptr} slot in the @code{UDF_INIT} structure for reuse by -future @code{xxx()} calls. @xref{UDF calling}. - -To indicate a return value of @code{NULL} in the main function, set -@code{is_null} to @code{1}: - -@example -*is_null = 1; -@end example - -To indicate an error return in the main function, set the @code{error} -parameter to @code{1}: - -@example -*error = 1; -@end example - -If @code{xxx()} sets @code{*error} to @code{1} for any row, the function -value is @code{NULL} for the current row and for any subsequent rows -processed by the statement in which @code{XXX()} was invoked. (@code{xxx()} -will not even be called for subsequent rows.) @strong{Note}: in -MySQL versions prior to 3.22.10, you should set both @code{*error} -and @code{*is_null}: - -@example -*error = 1; -*is_null = 1; -@end example - - -@node UDF compiling, , UDF return values, Adding UDF -@subsubsection Compiling and Installing User-definable Functions - -@cindex compiling, user-defined functions -@cindex UDFs, compiling -@cindex installing, user-defined functions - -Files implementing UDFs must be compiled and installed on the host where the -server runs. This process is described below for the example UDF file -@file{udf_example.cc} that is included in the MySQL source -distribution. This file contains the following functions: - -@itemize @bullet -@item -@code{metaphon()} returns a metaphon string of the string argument. -This is something like a soundex string, but it's more tuned for English. -@item -@code{myfunc_double()} returns the sum of the ASCII values of the -characters in its arguments, divided by the sum of the length of its arguments. -@item -@code{myfunc_int()} returns the sum of the length of its arguments. -@item -@code{sequence([const int])} returns an sequence starting from the given -number or 1 if no number has been given. -@item -@code{lookup()} returns the IP number for a hostname. -@item -@code{reverse_lookup()} returns the hostname for an IP number. -The function may be called with a string @code{"xxx.xxx.xxx.xxx"} or -four numbers. -@end itemize - -A dynamically loadable file should be compiled as a sharable object file, -using a command something like this: - -@example -shell> gcc -shared -o udf_example.so myfunc.cc -@end example - -You can easily find out the correct compiler options for your system by -running this command in the @file{sql} directory of your MySQL -source tree: - -@example -shell> make udf_example.o -@end example - -You should run a compile command similar to the one that @code{make} displays, -except that you should remove the @code{-c} option near the end of the line -and add @code{-o udf_example.so} to the end of the line. (On some systems, -you may need to leave the @code{-c} on the command.) - -Once you compile a shared object containing UDFs, you must install it -and tell MySQL about it. Compiling a shared object from -@file{udf_example.cc} produces a file named something like -@file{udf_example.so} (the exact name may vary from platform to platform). -Copy this file to some directory searched by @code{ld}, such as -@file{/usr/lib}. On many systems, you can set the @code{LD_LIBRARY} or -@code{LD_LIBRARY_PATH} environment variable to point at the directory where -you have your UDF function files. The @code{dlopen} manual page tells you -which variable you should use on your system. You should set this in -@code{mysql.server} or @code{safe_mysqld} startup scripts and restart -@code{mysqld}. - -After the library is installed, notify @code{mysqld} about the new -functions with these commands: - -@example -mysql> CREATE FUNCTION metaphon RETURNS STRING SONAME "udf_example.so"; -mysql> CREATE FUNCTION myfunc_double RETURNS REAL SONAME "udf_example.so"; -mysql> CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "udf_example.so"; -mysql> CREATE FUNCTION lookup RETURNS STRING SONAME "udf_example.so"; -mysql> CREATE FUNCTION reverse_lookup - -> RETURNS STRING SONAME "udf_example.so"; -mysql> CREATE AGGREGATE FUNCTION avgcost - -> RETURNS REAL SONAME "udf_example.so"; -@end example - -Functions can be deleted using @code{DROP FUNCTION}: - -@example -mysql> DROP FUNCTION metaphon; -mysql> DROP FUNCTION myfunc_double; -mysql> DROP FUNCTION myfunc_int; -mysql> DROP FUNCTION lookup; -mysql> DROP FUNCTION reverse_lookup; -mysql> DROP FUNCTION avgcost; -@end example - -The @code{CREATE FUNCTION} and @code{DROP FUNCTION} statements update the -system table @code{func} in the @code{mysql} database. The function's name, -type and shared library name are saved in the table. You must have the -@code{INSERT} and @code{DELETE} privileges for the @code{mysql} database -to create and drop functions. - -You should not use @code{CREATE FUNCTION} to add a function that has already -been created. If you need to reinstall a function, you should remove it with -@code{DROP FUNCTION} and then reinstall it with @code{CREATE FUNCTION}. You -would need to do this, for example, if you recompile a new version of your -function, so that @code{mysqld} gets the new version. Otherwise, the server -will continue to use the old version. - -Active functions are reloaded each time the server starts, unless you start -@code{mysqld} with the @code{--skip-grant-tables} option. In this case, UDF -initialisation is skipped and UDFs are unavailable. (An active function is -one that has been loaded with @code{CREATE FUNCTION} and not removed with -@code{DROP FUNCTION}.) - - -@node Adding native function, , Adding UDF, Adding functions -@subsection Adding a New Native Function - -@cindex adding, native functions -@cindex native functions, adding -@cindex functions, native, adding - -The procedure for adding a new native function is described here. Note -that you cannot add native functions to a binary distribution because -the procedure involves modifying MySQL source code. You must -compile MySQL yourself from a source distribution. Also note -that if you migrate to another version of MySQL (for example, -when a new version is released), you will need to repeat the procedure -with the new version. - -To add a new native MySQL function, follow these steps: - -@enumerate -@item -Add one line to @file{lex.h} that defines the function name in the -@code{sql_functions[]} array. -@item -If the function prototype is simple (just takes zero, one, two or three -arguments), you should in lex.h specify SYM(FUNC_ARG#) (where # is the -number of arguments) as the second argument in the -@code{sql_functions[]} array and add a function that creates a function -object in @file{item_create.cc}. Take a look at @code{"ABS"} and -@code{create_funcs_abs()} for an example of this. - -If the function prototype is complicated (for example takes a variable number -of arguments), you should add two lines to @file{sql_yacc.yy}. One -indicates the preprocessor symbol that @code{yacc} should define (this -should be added at the beginning of the file). Then define the function -parameters and add an ``item'' with these parameters to the -@code{simple_expr} parsing rule. For an example, check all occurrences -of @code{ATAN} in @file{sql_yacc.yy} to see how this is done. -@item -In @file{item_func.h}, declare a class inheriting from @code{Item_num_func} or -@code{Item_str_func}, depending on whether your function returns a number or a -string. -@item -In @file{item_func.cc}, add one of the following declarations, depending -on whether you are defining a numeric or string function: -@example -double Item_func_newname::val() -longlong Item_func_newname::val_int() -String *Item_func_newname::Str(String *str) -@end example - -If you inherit your object from any of the standard items (like -@code{Item_num_func} you probably only have to define one of the above -functions and let the parent object take care of the other functions. -For example, the @code{Item_str_func} class defines a @code{val()} function -that executes @code{atof()} on the value returned by @code{::str()}. - -@item -You should probably also define the following object function: -@example -void Item_func_newname::fix_length_and_dec() -@end example -This function should at least calculate @code{max_length} based on the -given arguments. @code{max_length} is the maximum number of characters -the function may return. This function should also set @code{maybe_null -= 0} if the main function can't return a @code{NULL} value. The -function can check if any of the function arguments can return -@code{NULL} by checking the arguments @code{maybe_null} variable. You -can take a look at @code{Item_func_mod::fix_length_and_dec} for a -typical example of how to do this. -@end enumerate - -All functions must be thread-safe (in other words, don't use any global or -static variables in the functions without protecting them with mutexes). - -If you want to return @code{NULL}, from @code{::val()}, @code{::val_int()} -or @code{::str()} you should set @code{null_value} to 1 and return 0. - -For @code{::str()} object functions, there are some additional -considerations to be aware of: - -@itemize @bullet -@item -The @code{String *str} argument provides a string buffer that may be -used to hold the result. (For more information about the @code{String} type, -take a look at the @file{sql_string.h} file.) -@item -The @code{::str()} function should return the string that holds the result or -@code{(char*) 0} if the result is @code{NULL}. -@item -All current string functions try to avoid allocating any memory unless -absolutely necessary! -@end itemize - - -@node Adding procedures, , Adding functions, Extending MySQL -@section Adding New Procedures to MySQL - -@cindex procedures, adding -@cindex adding, procedures -@cindex new procedures, adding - -In MySQL, you can define a procedure in C++ that can access and -modify the data in a query before it is sent to the client. The modification -can be done on row-by-row or @code{GROUP BY} level. - -We have created an example procedure in MySQL Version 3.23 to -show you what can be done. - -Additionally we recommend you to take a look at @code{mylua}. -With this you can use the LUA language to load a procedure at -runtime into @code{mysqld}. - -@menu -* procedure analyse:: Procedure analyse -* Writing a procedure:: Writing a procedure. -@end menu - - -@node procedure analyse, Writing a procedure, Adding procedures, Adding procedures -@subsection Procedure Analyse - -@code{analyse([max elements,[max memory]])} - -This procedure is defined in the @file{sql/sql_analyse.cc}. This -examines the result from your query and returns an analysis of the -results: - -@itemize @bullet -@item -@code{max elements} (default 256) is the maximum number of distinct values -@code{analyse} will notice per column. This is used by @code{analyse} to check if -the optimal column type should be of type @code{ENUM}. -@item -@code{max memory} (default 8192) is the maximum memory @code{analyse} should -allocate per column while trying to find all distinct values. -@end itemize - -@example -SELECT ... FROM ... WHERE ... PROCEDURE ANALYSE([max elements,[max memory]]) -@end example - - -@node Writing a procedure, , procedure analyse, Adding procedures -@subsection Writing a Procedure - -For the moment, the only documentation for this is the source. - -You can find all information about procedures by examining the following files: - -@itemize @bullet -@item @file{sql/sql_analyse.cc} -@item @file{sql/procedure.h} -@item @file{sql/procedure.cc} -@item @file{sql/sql_select.cc} -@end itemize - - -@node Problems, Contrib, Extending MySQL, Top -@appendix Problems and Common Errors - -@cindex problems, common errors -@cindex errors, common - -@menu -* What is crashing:: How to determine what is causing problems -* Common errors:: Common Errors When Using MySQL -* Installation Issues:: Installation Related Issues -* Administration Issues:: Administration Related Issues -* Query Issues:: Query Related Issues -* Table Definition Issues:: Table Definition Related Issues -@end menu - -This chapter lists some common problems and error messages that users have -run into. You will learn how to figure out what the problem is, and what -to do to solve it. You will also find proper solutions to some common -problems. - - -@node What is crashing, Common errors, Problems, Problems -@appendixsec How to Determine What Is Causing Problems - -When you run into problems, the first thing you should do is to find out -which program / piece of equipment is causing problems: - -@itemize @bullet -@item -If you have one of the following symptoms, then it is probably a hardware -(like memory, motherboard, CPU, or hard disk) or kernel problem: -@itemize @minus -@item -The keyboard doesn't work. This can normally be checked by pressing -Caps Lock. If the Caps Lock light doesn't change you have to replace -your keyboard. (Before doing this, you should try to reboot -your computer and check all cables to the keyboard.) -@item -The mouse pointer doesn't move. -@item -The machine doesn't answer to a remote machine's pings. -@item -Different, unrelated programs don't behave correctly. -@item -If your system rebooted unexpectedly (a faulty user level program should -@strong{never} be able to take down your system). -@end itemize - -In this case you should start by checking all your cables and run some -diagnostic tool to check your hardware! -You should also check if there are any patches, updates, or service -packs for your operating system that could likely solve your problems. -Check also that all your libraries (like glibc) are up to date. - -It's always good to use a machine with ECC memory to discover -memory problems early! -@item -If your keyboard is locked up, you may be able to fix this by -logging into your machine from another machine and execute -@code{kbd_mode -a} on it. - -@item -Please examine your system log file (/var/log/messages or similar) for -reasons for your problems. If you think the problem is in MySQL -then you should also examine MySQL's log files. @xref{Update log}. - -@item -If you don't think you have hardware problems, you should try to find -out which program is causing problems. - -Try using @code{top}, @code{ps}, @code{taskmanager}, or some similar program, -to check which program is taking all CPU or is locking the machine. - -@item -Check with @code{top}, @code{df}, or a similar program if you are out of -memory, disk space, open files, or some other critical resource. - -@item -If the problem is some runaway process, you can always try to kill it. If it -doesn't want to die, there is probably a bug in the operating system. -@end itemize - -If after you have examined all other possibilities and you have -concluded that it's the MySQL server or a MySQL client -that is causing the problem, it's time to do a bug report for our -mailing list or our support team. In the bug report, try to give a -very detailed description of how the system is behaving and what you think is -happening. You should also state why you think it's MySQL that -is causing the problems. Take into consideration all the situations in -this chapter. State any problems exactly how they appear when you -examine your system. Use the 'cut and paste' method for any output -and/or error messages from programs and/or log files! - -Try to describe in detail which program is not working and all -symptoms you see! We have in the past received many bug reports that just -state "the system doesn't work". This doesn't provide us with any -information about what could be the problem. - -If a program fails, it's always useful to know: - -@itemize @bullet -@item -Has the program in question made a segmentation fault (core dumped)? -@item -Is the program taking up the whole CPU? Check with @code{top}. Let the -program run for a while, it may be evaluating something heavy. -@item -If it's the @code{mysqld} server that is causing problems, can you -do @code{mysqladmin -u root ping} or @code{mysqladmin -u root processlist}? -@item -What does a client program say (try with @code{mysql}, for example) -when you try to connect to the MySQL server? -Does the client jam? Do you get any output from the program? -@end itemize - -When sending a bug report, you should of follow the outlines -described in this manual. @xref{Asking questions}. - - -@node Common errors, Installation Issues, What is crashing, Problems -@appendixsec Common Errors When Using MySQL - -@cindex errors, list of - -@menu -* Error Access denied:: @code{Access denied} Error -* Gone away:: @code{MySQL server has gone away} error -* Can not connect to server:: @code{Can't connect to [local] MySQL server} error -* Blocked host:: @code{Host '...' is blocked} error -* Too many connections:: @code{Too many connections} error -* Non-transactional tables:: @code{Some non-transactional changed tables couldn't be rolled back} Error -* Out of memory:: @code{Out of memory} error -* Packet too large:: @code{Packet too large} error -* Communication errors:: Communication errors / Aborted connection -* Full table:: @code{The table is full} error -* Cannot create:: @code{Can't create/write to file} Error -* Commands out of sync:: @code{Commands out of sync} error in client -* Ignoring user:: @code{Ignoring user} error -* Cannot find table:: @code{Table 'xxx' doesn't exist} error -* Cannot initialize character set:: @code{Can't initialize character set xxx} error -* Not enough file handles:: File Not Found -@end menu - - -This section lists some errors that users frequently get. You will find -descriptions of the errors, and how to solve the problem here. - - -@node Error Access denied, Gone away, Common errors, Common errors -@appendixsubsec @code{Access denied} Error - -@cindex errors, access denied -@cindex problems, access denied errors -@cindex access denied errors - -@xref{Privileges}, and especially. @xref{Access denied}. - - -@node Gone away, Can not connect to server, Error Access denied, Common errors -@appendixsubsec @code{MySQL server has gone away} Error - -This section also covers the related @code{Lost connection to server -during query} error. - -The most common reason for the @code{MySQL server has gone away} error -is that the server timed out and closed the connection. By default, the -server closes the connection after 8 hours if nothing has happened. You -can change the time limit by setting the @code{wait_timeout} variable when -you start @code{mysqld}. - -Another common reason to receive the @code{MySQL server has gone away} error -is because you have issued a ``close'' on your MySQL connection -and then tried to run a query on the closed connection. - -If you have a script, you just have to issue the query again for the client -to do an automatic reconnection. - -You normally can get the following error codes in this case -(which one you get is OS-dependent): - -@multitable @columnfractions .35 .65 -@item @strong{Error code} @tab @strong{Description} -@item @code{CR_SERVER_GONE_ERROR} @tab The client couldn't send a question to the -server. -@item @code{CR_SERVER_LOST} @tab The client didn't get an error when writing -to the server, but it didn't get a full answer (or any answer) to the question. -@end multitable - -You will also get this error if someone has kills the running thread with -@code{kill #threadid#}. - -You can check that the MySQL hasn't died by executing @code{mysqladmin -version} and examining the uptime. If the problem is that mysqld -crashed you should concentrate one finding the reason for the crash. -You should in this case start by checking if issuing the query again -will kill MySQL again. @xref{Crashing}. - -You can also get these errors if you send a query to the server that is -incorrect or too large. If @code{mysqld} gets a packet that is too large -or out of order, it assumes that something has gone wrong with the client and -closes the connection. If you need big queries (for example, if you are -working with big @code{BLOB} columns), you can increase the query limit by -starting @code{mysqld} with the @code{-O max_allowed_packet=#} option -(default 1M). The extra memory is allocated on demand, so @code{mysqld} will -use more memory only when you issue a big query or when @code{mysqld} must -return a big result row! - -If you want to make a bug report regarding this problem, be sure that -you include the following information: - -@itemize @bullet -@item -Include information if MySQL died or not. (You can find this in the -@code{hostname.err file}. @xref{Crashing}. -@item -If a specific query kills @code{mysqld} and the involved tables where -checked with @code{CHECK TABLE} before you did the query, can you do -a test case for this? @xref{Reproduceable test case}. -@item -What is the value of the @code{wait_timeout} variable in the MySQL server ? -@code{mysqladmin variables} gives you the value of this -@item -Have you tried to run @code{mysqld} with @code{--log} and check if the -issued query appears in the log ? -@end itemize - -@xref{Asking questions}. - -@node Can not connect to server, Blocked host, Gone away, Common errors -@appendixsubsec @code{Can't connect to [local] MySQL server} Error - -A MySQL client on Unix can connect to the @code{mysqld} server in two -different ways: Unix sockets, which connect through a file in the file -system (default @file{/tmp/mysqld.sock}) or TCP/IP, which connects -through a port number. Unix sockets are faster than TCP/IP but can only -be used when connecting to a server on the same computer. Unix sockets -are used if you don't specify a hostname or if you specify the special -hostname @code{localhost}. - -On Windows, if the @code{mysqld} server is running on 9x/Me, you can -connect only via TCP/IP. If the server is running on NT/2000/XP and -mysqld is started with @code{--enable-named-pipe}, you -can also connect with named pipes. The name of the named pipe is MySQL. -If you don't give a hostname when connecting to @code{mysqld}, a MySQL -client will first try to connect to the named pipe, and if this doesn't -work it will connect to the TCP/IP port. You can force the use of named -pipes on Windows by using @code{.} as the hostname. - -The error (2002) @code{Can't connect to ...} normally means that there -isn't a MySQL server running on the system or that you are -using a wrong socket file or TCP/IP port when trying to connect to the -@code{mysqld} server. - -Start by checking (using @code{ps} or the task manager on Windows) that -there is a process running named @code{mysqld} on your server! If there -isn't any @code{mysqld} process, you should start one. @xref{Starting -server}. - -If a @code{mysqld} process is running, you can check the server by -trying these different connections (the port number and socket pathname -might be different in your setup, of course): - -@example -shell> mysqladmin version -shell> mysqladmin variables -shell> mysqladmin -h `hostname` version variables -shell> mysqladmin -h `hostname` --port=3306 version -shell> mysqladmin -h 'ip for your host' version -shell> mysqladmin --socket=/tmp/mysql.sock version -@end example - -Note the use of backquotes rather than forward quotes with the @code{hostname} -command; these cause the output of @code{hostname} (that is, the current -hostname) to be substituted into the @code{mysqladmin} command. - -Here are some reasons the @code{Can't connect to local MySQL server} -error might occur: - -@itemize @bullet -@item -@code{mysqld} is not running. -@item -You are running on a system that uses MIT-pthreads. -If you are running on a system that doesn't have native threads, -@code{mysqld} uses the MIT-pthreads package. @xref{Which OS}. However, -not all MIT-pthreads versions support Unix sockets. On a system -without sockets support you must always specify the hostname explicitly -when connecting to the server. Try using this command to check the -connection to the server: -@example -shell> mysqladmin -h `hostname` version -@end example -@item -Someone has removed the Unix socket that @code{mysqld} uses (default -@file{/tmp/mysqld.sock}). You might have a @code{cron} job that removes -the MySQL socket (for example, a job that removes old files -from the @file{/tmp} directory). You can always run @code{mysqladmin -version} and check that the socket @code{mysqladmin} is trying to use -really exists. The fix in this case is to change the @code{cron} job to -not remove @file{mysqld.sock} or to place the socket somewhere else. -@xref{Problems with mysql.sock}. -@item -You have started the @code{mysqld} server with -the @code{--socket=/path/to/socket} option. If you change the socket -pathname for the server, you must also notify the MySQL clients -about the new path. You can do this by providing the socket path -as an argument to the client. @xref{Problems with mysql.sock}. -@item -You are using Linux and one thread has died (core dumped). In this case -you must kill the other @code{mysqld} threads (for example, with the -@code{mysql_zap} script before you can start a new MySQL -server. @xref{Crashing}. -@item -You may not have read and write privilege to either the directory that holds -the socket file or privilege to the socket file itself. In this case you -have to either change the privilege for the directory / file or restart -@code{mysqld} so that it uses a directory that you can access. -@end itemize - -If you get the error message @code{Can't connect to MySQL server on -some_hostname}, you can try the following things to find out what the -problem is : - -@itemize @bullet -@item -Check if the server is up by doing @code{telnet your-host-name -tcp-ip-port-number} and press Enter a couple of times. If there -is a MySQL server running on this port you should get a -responses that includes the version number of the running MySQL -server. If you get an error like @code{telnet: Unable to connect to -remote host: Connection refused}, then there is no server running on the -given port. -@item -Try connecting to the @code{mysqld} daemon on the local machine and check -the TCP/IP port that @code{mysqld} it's configured to use (variable @code{port}) with -@code{mysqladmin variables}. -@item -Check that your @code{mysqld} server is not started with the -@code{--skip-networking} option. -@end itemize - - -@node Blocked host, Too many connections, Can not connect to server, Common errors -@appendixsubsec @code{Host '...' is blocked} Error - -If you get an error like this: - -@example -Host 'hostname' is blocked because of many connection errors. -Unblock with 'mysqladmin flush-hosts' -@end example - -this means that @code{mysqld} has gotten a lot (@code{max_connect_errors}) -of connect requests from the host @code{'hostname'} that have been interrupted -in the middle. After @code{max_connect_errors} failed requests, @code{mysqld} -assumes that something is wrong (like an attack from a cracker), and -blocks the site from further connections until someone executes the command -@code{mysqladmin flush-hosts}. - -By default, @code{mysqld} blocks a host after 10 connection errors. -You can easily adjust this by starting the server like this: - -@example -shell> safe_mysqld -O max_connect_errors=10000 & -@end example - -Note that if you get this error message for a given host, you should first -check that there isn't anything wrong with TCP/IP connections from that -host. If your TCP/IP connections aren't working, it won't do you any good to -increase the value of the @code{max_connect_errors} variable! - - -@node Too many connections, Non-transactional tables, Blocked host, Common errors -@appendixsubsec @code{Too many connections} Error - -If you get the error @code{Too many connections} when you try to connect -to MySQL, this means that there is already @code{max_connections} -clients connected to the @code{mysqld} server. - -If you need more connections than the default (100), then you should restart -@code{mysqld} with a bigger value for the @code{max_connections} variable. - -Note that @code{mysqld} actually allows (@code{max_connections}+1) -clients to connect. The last connection is reserved for a user with the -@code{SUPER} privilege. By not giving this privilege to normal -users (they shouldn't need this), an administrator with this privilege -can log in and use @code{SHOW PROCESSLIST} to find out what could be -wrong. @xref{SHOW}. - -The maximum number of connects MySQL is depending on how good -the thread library is on a given platform. Linux or Solaris should be -able to support 500-1000 simultaneous connections, depending on how much -RAM you have and what your clients are doing. - - -@node Non-transactional tables, Out of memory, Too many connections, Common errors -@appendixsubsec @code{Some non-transactional changed tables couldn't be rolled back} Error - -@cindex Non-transactional tables - -If you get the error/warning: @code{Warning: Some non-transactional -changed tables couldn't be rolled back} when trying to do a -@code{ROLLBACK}, this means that some of the tables you used in the -transaction didn't support transactions. These non-transactional tables -will not be affected by the @code{ROLLBACK} statement. - -The most typical case when this happens is when you have tried to create -a table of a type that is not supported by your @code{mysqld} binary. -If @code{mysqld} doesn't support a table type (or if the table type is -disabled by a startup option) , it will instead create the table type -with the table type that is most resembles to the one you requested, -probably @code{MyISAM}. - -You can check the table type for a table by doing: - -@code{SHOW TABLE STATUS LIKE 'table_name'}. @xref{SHOW TABLE STATUS}. - -You can check the extensions your @code{mysqld} binary supports by doing: - -@code{show variables like 'have_%'}. @xref{SHOW VARIABLES}. - - -@node Out of memory, Packet too large, Non-transactional tables, Common errors -@appendixsubsec @code{Out of memory} Error - -If you issue a query and get something like the following error: - -@example -mysql: Out of memory at line 42, 'malloc.c' -mysql: needed 8136 byte (8k), memory in use: 12481367 bytes (12189k) -ERROR 2008: MySQL client ran out of memory -@end example - -note that the error refers to the MySQL client @code{mysql}. The -reason for this error is simply that the client does not have enough memory to -store the whole result. - -To remedy the problem, first check that your query is correct. Is it -reasonable that it should return so many rows? If so, -you can use @code{mysql --quick}, which uses @code{mysql_use_result()} -to retrieve the result set. This places less of a load on the client (but -more on the server). - - -@node Packet too large, Communication errors, Out of memory, Common errors -@appendixsubsec @code{Packet too large} Error - -When a MySQL client or the @code{mysqld} server gets a packet bigger -than @code{max_allowed_packet} bytes, it issues a @code{Packet too large} -error and closes the connection. - -In MySQL 3.23 the biggest possible packet is 16M (due to limits in the -client/server protocol). In MySQL 4.0.1 and up, this is only limited by -the amount on memory you have on your server (up to a theoretical -maximum of 2G). - -A communication packet is a single SQL statement sent to the MySQL server -or a single row that is sent to the client. - -When a MySQL client or the @code{mysqld} server gets a packet bigger -than @code{max_allowed_packet} bytes, it issues a @code{Packet too -large} error and closes the connection. With some clients, you may also -get @code{Lost connection to MySQL server during query} error if the -communication packet is too big. - -Note that both the client and the server has it's own -@code{max_allowed_packet} variable. If you want to handle big packets, -you have to increase this variable both in the client and in the server. - -It's safe to increase this variable as memory is only allocated when -needed; this variable is more a precaution to catch wrong packets -between the client/server and also to ensure that you don't accidentally -use big packets so that you run out of memory. - -If you are using the @code{mysql} client, you may specify a bigger -buffer by starting the client with @code{mysql --set-variable=max_allowed_packet=8M}. Other clients have different methods to set this variable. -Please note that @code{--set-variable} is deprecated since -@strong{MySQL 4.0}, just use @code{--max-allowed-packet=8M} instead. - -You can use the option file to set @code{max_allowed_packet} to a larger -size in @code{mysqld}. For example, if you are expecting to store the -full length of a @code{MEDIUMBLOB} into a table, you'll need to start -the server with the @code{set-variable=max_allowed_packet=16M} option. - -You can also get strange problems with large packets if you are using -big blobs, but you haven't given @code{mysqld} access to enough memory -to handle the query. If you suspect this is the case, try adding -@code{ulimit -d 256000} to the beginning of the @code{safe_mysqld} script -and restart @code{mysqld}. - -@node Communication errors, Full table, Packet too large, Common errors -@appendixsubsec Communication Errors / Aborted Connection - -@cindex aborted clients -@cindex aborted connection -@cindex connection, aborted - -Starting with @code{MySQL 3.23.40} you only get the @code{Aborted -connection} error of you start @code{mysqld} with @code{--warnings}. - -If you find errors like the following in your error log. - -@example -010301 14:38:23 Aborted connection 854 to db: 'users' user: 'josh' -@end example - -@xref{Error log}. - -This means that something of the following has happened: - -@itemize @bullet -@item -The client program did not call @code{mysql_close()} before exit. -@item -The client had been sleeping more than @code{wait_timeout} or -@code{interactive_timeout} without doing any requests. @xref{SHOW -VARIABLES}. -@item -The client program ended abruptly in the middle of the transfer. -@end itemize - -When the above happens, the server variable @code{Aborted_clients} is -incremented. - -The server variable @code{Aborted_connects} is incremented when: - -@itemize @bullet -@item -When a connection packet doesn't contain the right information. -@item -When the user didn't have privileges to connect to a database. -@item -When a user uses a wrong password. -@item -When it takes more than @code{connect_timeout} seconds to get -a connect package. -@end itemize - -Note that the above could indicate that someone is trying to break into -your database! - -@xref{SHOW VARIABLES}. - -Other reasons for problems with Aborted clients / Aborted connections. -@itemize @bullet -@item -Usage of duplex Ethernet protocol, both half and full with -Linux. Many Linux Ethernet drivers have this bug. You should test -for this bug by transferring a huge file via ftp between these two -machines. If a transfer goes in burst-pause-burst-pause ... mode then -you are experiencing a Linux duplex syndrome. The only solution to -this problem is switching of both half and full duplexing on hubs -and switches. -@item -Some problem with the thread library that causes interrupts on reads. -@item -Badly configured TCP/IP. -@item -Faulty Ethernets or hubs or switches, cables ... This can be diagnosed -properly only by replacing hardware. -@item -@code{max_allowed_packet} is too small or queries require more memory -than you have alloacated for @code{mysqld}. @xref{Packet too large}. -@end itemize - - -@node Full table, Cannot create, Communication errors, Common errors -@appendixsubsec @code{The table is full} Error - -@cindex table is full - -There is a couple of different cases when you can get this error: - -@itemize @bullet -@item -You are using an older MySQL version (before 3.23.0) when an in-memory -temporary table becomes larger than @code{tmp_table_size} bytes. -To avoid this problem, you can use the @code{-O tmp_table_size=#} option -to make @code{mysqld} increase the temporary table size or use the SQL -option @code{BIG_TABLES} before you issue the problematic query. -@xref{SET OPTION, ,@code{SET}}. - -You can also start @code{mysqld} with the @code{--big-tables} option. -This is exactly the same as using @code{BIG_TABLES} for all queries. - -In MySQL Version 3.23, in-memory temporary tables will automatically be -converted to a disk-based @code{MyISAM} table after the table size gets -bigger than @code{tmp_table_size}. -@item -You are using @code{InnoDB} tables and run out of room in the -@code{InnoDB} tablespace. In this case the solution is to extend the -@code{InnoDB} tablespace. -@item -You are using @code{ISAM} or @code{MyISAM} tables on an OS that only -supports files of 2G in size and you have hit this limit for the data -or index file. -@item -You are using @code{MyISAM} tables and the needed data or index size is -bigger than what MySQL has allocated pointers for. (If you don't specify -@code{MAX_ROWS} to @code{CREATE TABLE} MySQL will only allocate pointers -to hold 4G of data). - -You can check the maximum data/index sizes by doing -@example -SHOW TABLE STATUS FROM database LIKE 'table_name'; -@end example -or using @code{myisamchk -dv database/table_name}. - -If this is the problem, you can fix it by doing something like: -@example -ALTER TABLE table_name MAX_ROWS=1000000000 AVG_ROW_LENGTH=nnn; -@end example -You only have to specify @code{AVG_ROW_LENGTH} for tables with BLOB/TEXT -fields as in this case MySQL can't optimise the space required based -only on the number of rows. -@end itemize - - -@node Cannot create, Commands out of sync, Full table, Common errors -@appendixsubsec @code{Can't create/write to file} Error - -@cindex can't create/write to file - -If you get an error for some queries of type: - -@example -Can't create/write to file '\\sqla3fe_0.ism'. -@end example - -this means that MySQL can't create a temporary file for the -result set in the given temporary directory. (The above error is a -typical error message on Windows, and the Unix error message is similar.) -The fix is to start @code{mysqld} with @code{--tmpdir=path} or to add to your option -file: - -@example -[mysqld] -tmpdir=C:/temp -@end example - -assuming that the @file{c:\\temp} directory exists. @xref{Option files}. - -Check also the error code that you get with @code{perror}. One reason -may also be a disk full error; - -@example -shell> perror 28 -Error code 28: No space left on device -@end example - - -@node Commands out of sync, Ignoring user, Cannot create, Common errors -@appendixsubsec @code{Commands out of sync} Error in Client - -@cindex commands out of sync - -If you get @code{Commands out of sync; you can't run this command now} -in your client code, you are calling client functions in the wrong order! - -This can happen, for example, if you are using @code{mysql_use_result()} and -try to execute a new query before you have called @code{mysql_free_result()}. -It can also happen if you try to execute two queries that return data without -a @code{mysql_use_result()} or @code{mysql_store_result()} in between. - - -@node Ignoring user, Cannot find table, Commands out of sync, Common errors -@appendixsubsec @code{Ignoring user} Error - -If you get the following error: - -@code{Found wrong password for user: 'some_user@@some_host'; ignoring user} - -this means that when @code{mysqld} was started or when it reloaded the -permissions tables, it found an entry in the @code{user} table with -an invalid password. As a result, the entry is simply ignored by the -permission system. - -Possible causes of and fixes for this problem: - -@itemize @bullet -@item -You may be running a new version of @code{mysqld} with an old -@code{user} table. -You can check this by executing @code{mysqlshow mysql user} to see if -the password field is shorter than 16 characters. If so, you can correct this -condition by running the @code{scripts/add_long_password} script. - -@item -The user has an old password (8 characters long) and you didn't start -@code{mysqld} with the @code{--old-protocol} option. -Update the user in the @code{user} table with a new password or -restart @code{mysqld} with @code{--old-protocol}. - -@item -@findex PASSWORD() -You have specified a password in the @code{user} table without using the -@code{PASSWORD()} function. Use @code{mysql} to update the user in the -@code{user} table with a new password. Make sure to use the @code{PASSWORD()} -function: - -@example -mysql> UPDATE user SET password=PASSWORD('your password') - -> WHERE user='XXX'; -@end example -@end itemize - - -@node Cannot find table, Cannot initialize character set, Ignoring user, Common errors -@appendixsubsec @code{Table 'xxx' doesn't exist} Error - -If you get the error @code{Table 'xxx' doesn't exist} or @code{Can't -find file: 'xxx' (errno: 2)}, this means that no table exists -in the current database with the name @code{xxx}. - -Note that as MySQL uses directories and files to store databases and -tables, the database and table names are @strong{case-sensitive}! -(On Windows the databases and tables names are not case-sensitive, but all -references to a given table within a query must use the same case!) - -You can check which tables you have in the current database with -@code{SHOW TABLES}. @xref{SHOW, , @code{SHOW}}. - - -@node Cannot initialize character set, Not enough file handles, Cannot find table, Common errors -@appendixsubsec @code{Can't initialize character set xxx} error - -@cindex multi-byte character sets - -If you get an error like: - -@example -MySQL Connection Failed: Can't initialize character set xxx -@end example - -This means one of the following things: - -@itemize @bullet -@item -The character set is a multi-byte character set and you have no support -for the character set in the client. - -In this case you need to recompile the client with -@code{--with-charset=xxx} or with @code{--with-extra-charsets=xxx}. -@xref{configure options}. - -All standard MySQL binaries are compiled with -@code{--with-extra-character-sets=complex} which will enable support for -all multi-byte character sets. @xref{Character sets}. - -@item -The character set is a simple character set which is not compiled into -@code{mysqld} and the character set definition files are not in the place -where the client expects to find them. - -In this case you need to: - -@itemize @bullet -@item -Recompile the client with support for the character set. -@xref{configure options}. -@item -Specify to the client where the character set definition files are. For many -clients you can do this with the -@code{--character-sets-dir=path-to-charset-dir} option. -@item -Copy the character definition files to the path where the client expects them -to be. -@end itemize -@end itemize - - -@node Not enough file handles, , Cannot initialize character set, Common errors -@appendixsubsec File Not Found - -If you get @code{ERROR '...' not found (errno: 23)}, @code{Can't open -file: ... (errno: 24)}, or any other error with @code{errno 23} or -@code{errno 24} from MySQL, it means that you haven't allocated -enough file descriptors for MySQL. You can use the -@code{perror} utility to get a description of what the error number -means: - -@example -shell> perror 23 -File table overflow -shell> perror 24 -Too many open files -shell> perror 11 -Resource temporarily unavailable -@end example - -The problem here is that @code{mysqld} is trying to keep open too many -files simultaneously. You can either tell @code{mysqld} not to open so -many files at once or increase the number of file descriptors -available to @code{mysqld}. - -To tell @code{mysqld} to keep open fewer files at a time, you can make -the table cache smaller by using the @code{-O table_cache=32} option to -@code{safe_mysqld} (the default value is 64). Reducing the value of -@code{max_connections} will also reduce the number of open files (the -default value is 90). - -@tindex ulimit -To change the number of file descriptors available to @code{mysqld}, you -can use the option @code{--open-files-limit=#} to @code{safe_mysqld} or -@code{-O open-files-limit=#} to @code{mysqld}. @xref{SHOW VARIABLES}. -The easiest way to do that is to add the option to your option file. -@xref{Option files}. If you have an old @code{mysqld} version that -doesn't support this, you can edit the @code{safe_mysqld} script. There -is a commented-out line @code{ulimit -n 256} in the script. You can -remove the @code{'#'} character to uncomment this line, and change the -number 256 to affect the number of file descriptors available to -@code{mysqld}. - -@code{ulimit} (and @code{open-files-limit}) can increase the number of -file descriptors, but only up to the limit imposed by the operating -system. There is also a 'hard' limit that can only be overrided if you -start @code{safe_mysqld} or @code{mysqld} as root (just remember that -you need to also use the @code{--user=...} option in this case). If you -need to increase the OS limit on the number of file descriptors -available to each process, consult the documentation for your operating -system. - -Note that if you run the @code{tcsh} shell, @code{ulimit} will not work! -@code{tcsh} will also report incorrect values when you ask for the current -limits! In this case you should start @code{safe_mysqld} with @code{sh}! - - -@node Installation Issues, Administration Issues, Common errors, Problems -@appendixsec Installation Related Issues - - -@menu -* Link errors:: Problems When Linking with the MySQL Client Library -* Changing MySQL user:: How to Run MySQL As a Normal User -* File permissions:: -@end menu - -@node Link errors, Changing MySQL user, Installation Issues, Installation Issues -@appendixsubsec Problems When Linking with the MySQL Client Library - -@cindex linking, errors -@cindex errors, linking -@cindex problems, linking - -If you are linking your program and you get errors for unreferenced -symbols that start with @code{mysql_}, like the following: - -@example -/tmp/ccFKsdPa.o: In function `main': -/tmp/ccFKsdPa.o(.text+0xb): undefined reference to `mysql_init' -/tmp/ccFKsdPa.o(.text+0x31): undefined reference to `mysql_real_connect' -/tmp/ccFKsdPa.o(.text+0x57): undefined reference to `mysql_real_connect' -/tmp/ccFKsdPa.o(.text+0x69): undefined reference to `mysql_error' -/tmp/ccFKsdPa.o(.text+0x9a): undefined reference to `mysql_close' -@end example - -you should be able to solve this by adding @code{-Lpath-to-the-mysql-library --lmysqlclient} @strong{last} on your link line. - -If you get @code{undefined reference} errors for the @code{uncompress} -or @code{compress} function, add @code{-lz} @strong{last} on your link -line and try again! - -If you get @code{undefined reference} errors for functions that should -exist on your system, like @code{connect}, check the man page for the -function in question, for which libraries you should add to the link -line! - -If you get @code{undefined reference} errors for functions that don't -exist on your system, like the following: - -@example -mf_format.o(.text+0x201): undefined reference to `__lxstat' -@end example - -it usually means that your library is compiled on a system that is not -100% compatible with yours. In this case you should download the -latest MySQL source distribution and compile this yourself. -@xref{Installing source}. - -If you are trying to run a program and you then get errors for -unreferenced symbols that start with @code{mysql_} or that the -@code{mysqlclient} library can't be found, this means that your system -can't find the share @file{libmysqlclient.so} library. - -The fix for this is to tell your system to search after shared -libraries where the library is located by one of the following methods: - -@itemize @bullet -@item -Add the path to the directory where you have @file{libmysqlclient.so} the -@code{LD_LIBRARY_PATH} environment variable. -@item -Add the path to the directory where you have @file{libmysqlclient.so} the -@code{LD_LIBRARY} environment variable. -@item -Copy @file{libmysqlclient.so} to some place that is searched by your system, -like @file{/lib}, and update the shared library information by executing -@code{ldconfig}. -@end itemize - -Another way to solve this problem is to link your program statically, with -@code{-static}, or by removing the dynamic MySQL libraries -before linking your code. In the second case you should be -sure that no other programs are using the dynamic libraries! - - -@node Changing MySQL user, File permissions, Link errors, Installation Issues -@appendixsubsec How to Run MySQL As a Normal User - -@cindex starting, @code{mysqld} -@cindex @code{mysqld}, starting - -The MySQL server @code{mysqld} can be started and run by any user. -In order to change @code{mysqld} to run as a Unix user @code{user_name}, you must -do the following: - -@enumerate -@item -Stop the server if it's running (use @code{mysqladmin shutdown}). - -@item -Change the database directories and files so that @code{user_name} has -privileges to read and write files in them (you may need to do this as -the Unix @code{root} user): - -@example -shell> chown -R user_name /path/to/mysql/datadir -@end example - -If directories or files within the MySQL data directory are -symlinks, you'll also need to follow those links and change the directories -and files they point to. @code{chown -R} may not follow symlinks for -you. - -@item -Start the server as user @code{user_name}, or, if you are using -MySQL Version 3.22 or later, start @code{mysqld} as the Unix @code{root} -user and use the @code{--user=user_name} option. @code{mysqld} will switch -to run as the Unix user @code{user_name} before accepting any connections. - -@item -To start the server as the given user name automatically at system -startup time, add a @code{user} line that specifies the user name to -the @code{[mysqld]} group of the @file{/etc/my.cnf} option file or the -@file{my.cnf} option file in the server's data directory. For example: - -@example -[mysqld] -user=user_name -@end example -@end enumerate - -At this point, your @code{mysqld} process should be running fine and dandy as -the Unix user @code{user_name}. One thing hasn't changed, though: the -contents of the permissions tables. By default (right after running the -permissions table install script @code{mysql_install_db}), the MySQL -user @code{root} is the only user with permission to access the @code{mysql} -database or to create or drop databases. Unless you have changed those -permissions, they still hold. This shouldn't stop you from accessing -MySQL as the MySQL @code{root} user when you're logged in -as a Unix user other than @code{root}; just specify the @code{-u root} option -to the client program. - -Note that accessing MySQL as @code{root}, by supplying @code{-u -root} on the command-line, has @strong{nothing} to do with MySQL running -as the Unix @code{root} user, or, indeed, as another Unix user. The access -permissions and user names of MySQL are completely separate from -Unix user names. The only connection with Unix user names is that if you -don't provide a @code{-u} option when you invoke a client program, the client -will try to connect using your Unix login name as your MySQL user -name. - -If your Unix box itself isn't secured, you should probably at least put a -password on the MySQL @code{root} users in the access tables. -Otherwise, any user with an account on that machine can run @code{mysql -u -root db_name} and do whatever he likes. - - -@node File permissions, , Changing MySQL user, Installation Issues -@appendixsubsec Problems with File Permissions - -@cindex files, permissions -@cindex error mesaages, can't find file -@cindex files, not found message - -If you have problems with file permissions, for example, if @code{mysql} -issues the following error message when you create a table: - -@example -ERROR: Can't find file: 'path/with/filename.frm' (Errcode: 13) -@end example - -@tindex UMASK environment variable -@tindex Environment variable, UMASK -then the environment variable @code{UMASK} might be set incorrectly when -@code{mysqld} starts up. The default umask value is @code{0660}. You can -change this behaviour by starting @code{safe_mysqld} as follows: - -@example -shell> UMASK=384 # = 600 in octal -shell> export UMASK -shell> /path/to/safe_mysqld & -@end example - -@tindex UMASK_DIR environment variable -@tindex Environment variable, UMASK_DIR -By default MySQL will create database and @code{RAID} -directories with permission type 0700. You can modify this behaviour by -setting the @code{UMASK_DIR} variable. If you set this, new -directories are created with the combined @code{UMASK} and -@code{UMASK_DIR}. For example, if you want to give group access to -all new directories, you can do: - -@example -shell> UMASK_DIR=504 # = 770 in octal -shell> export UMASK_DIR -shell> /path/to/safe_mysqld & -@end example - -In MySQL Version 3.23.25 and above, MySQL assumes that the -value for @code{UMASK} and @code{UMASK_DIR} is in octal if it starts -with a zero. - -@xref{Environment variables}. - - -@node Administration Issues, Query Issues, Installation Issues, Problems -@appendixsec Administration Related Issues - - -@menu -* Crashing:: What To Do If MySQL Keeps Crashing -* Resetting permissions:: How to Reset a Forgotten Root Password -* Full disk:: How MySQL Handles a Full Disk -* Temporary files:: Where MySQL Stores Temporary Files -* Problems with mysql.sock:: How to Protect @file{/tmp/mysql.sock} from Being Deleted -* Timezone problems:: Time Zone Problems -@end menu - -@node Crashing, Resetting permissions, Administration Issues, Administration Issues -@appendixsubsec What To Do If MySQL Keeps Crashing - -@cindex crash, repeated - -All MySQL versions are tested on many platforms before they are -released. This doesn't mean that there aren't any bugs in -MySQL, but it means if there are bugs, they are very few and can be -hard to find. If you have a problem, it will always help if you try to -find out exactly what crashes your system, as you will have a much better -chance of getting this fixed quickly. - -First, you should try to find out whether the problem is that the -@code{mysqld} daemon dies or whether your problem has to do with your -client. You can check how long your @code{mysqld} server has been up by -executing @code{mysqladmin version}. If @code{mysqld} has died, you may -find the reason for this in the file -@file{mysql-data-directory/`hostname`.err}. @xref{Error log}. - -Many crashes of MySQL are caused by corrupted index / data -files. MySQL will update the data on disk, with the -@code{write()} system call, after every SQL statement and before the -client is notified about the result. (This is not true if you are running -with @code{delay_key_write}, in which case only the data is written.) -This means that the data is safe even if @code{mysqld} crashes, as the OS will -ensure that the not flushed data is written to disk. You can force -MySQL to sync everything to disk after every SQL command by -starting @code{mysqld} with @code{--flush}. - -The above means that normally you shouldn't get corrupted tables unless: - -@itemize @bullet -@item -Someone/something killed @code{mysqld} or the machine in the middle -of an update. -@item -You have found a bug in @code{mysqld} that caused it to die in the -middle of an update. -@item -Someone is manipulating the data/index files outside of @strong{mysqld} -without locking the table properly. -@item -If you are running many @code{mysqld} servers on the same data on a -system that doesn't support good filesystem locks (normally handled by -the @code{lockd} daemon ) or if you are running -multiple servers with @code{--skip-external-locking} -@item -You have a crashed index/datafile that contains very wrong data that -got @code{mysqld} confused. -@item -You have found a bug in the data storage code. This isn't that likely, -but it's at least possible. In this case you can try to change the file -type to another database handler by using @code{ALTER TABLE} on a -repaired copy of the table! -@end itemize - -Because it is very difficult to know why something is crashing, first try to -check whether things that work for others crash for you. Please try -the following things: - -@itemize @bullet -Take down the @code{mysqld} daemon with @code{mysqladmin shutdown}, run -@code{myisamchk --silent --force */*.MYI} on all tables, and restart the -@code{mysqld} daemon. This will ensure that you are running from a clean -state. @xref{MySQL Database Administration}. - -@item -Use @code{mysqld --log} and try to determine from the information in the log -whether some specific query kills the server. About 95% of all bugs are -related to a particular query! Normally this is one of the last queries in -the log file just before MySQL restarted. @xref{Query log}. -If you can repeatadly kill MySQL with one of the queries, even -when you have checked all tables just before doing the query, then you -have been able to locate the bug and should do a bug report for this! -@xref{Bug reports}. - -@item -Try to make a test case that we can use to reproduce the problem. -@xref{Reproduceable test case}. - -@item -Try running the included mysql-test test and the MySQL -benchmarks. @xref{MySQL test suite}. They should test MySQL -rather well. You can also add code that to the benchmarks to simulates -your application! The benchmarks can be found in the @file{bench} -directory in the source distribution or, for a binary distribution, in -the @file{sql-bench} directory under your MySQL installation -directory. - -@item -Try @code{fork_test.pl} and @code{fork2_test.pl}. - -@item -If you configure MySQL for debugging, it will be much easier to -gather information about possible errors if something goes wrong. -Reconfigure MySQL with the @code{--with-debug} option or -@code{--with-debug=full} to @code{configure} and then recompile. -@xref{Debugging server}. - -@item -Configuring MySQL for debugging causes a safe memory allocator to be -included that can find some errors. It also provides a lot of output about -what is happening. - -@item -Have you applied the latest patches for your operating system? - -@item -Use the @code{--skip-external-locking} option to @code{mysqld}. On some -systems, the @code{lockd} lock manager does not work properly; the -@code{--skip-external-locking} option tells @code{mysqld} not to use external -locking. (This means that you cannot run 2 @code{mysqld} servers on the same -data and that you must be careful if you use @code{myisamchk}, but it may be -instructive to try the option as a test.) - -@item -Have you tried @code{mysqladmin -u root processlist} when @code{mysqld} -appears to be running but not responding? Sometimes @code{mysqld} is not -comatose even though you might think so. The problem may be that all -connections are in use, or there may be some internal lock problem. -@code{mysqladmin processlist} will usually be able to make a connection even -in these cases, and can provide useful information about the current number -of connections and their status. - -@item -Run the command @code{mysqladmin -i 5 status} or @code{mysqladmin -i 5 --r status} or in a separate window to produce statistics while you run -your other queries. - -@item -Try the following: -@enumerate -@item -Start @code{mysqld} from @code{gdb} (or in another debugger). -@xref{Using gdb on mysqld}. - -@item -Run your test scripts. - -@item -Print the backtrace and the local variables at the 3 lowest levels. In gdb you -can do this with the following commands when @code{mysqld} has crashed inside -gdb: - -@example -backtrace -info local -up -info local -up -info local -@end example - -With gdb you can also examine which threads exist with @code{info -threads} and switch to a specific thread with @code{thread #}, where -@code{#} is the thread id. -@end enumerate - -@item -Try to simulate your application with a Perl script to force -MySQL to crash or misbehave. - -@item -Send a normal bug report. @xref{Bug reports}. Be even more detailed -than usual. Because MySQL works for many people, it may be that the -crash results from something that exists only on your computer (for example, -an error that is related to your particular system libraries). -@item -If you have a problem with tables with dynamic-length rows and you are -not using @code{BLOB/TEXT} columns (but only @code{VARCHAR} columns), you -can try to change all @code{VARCHAR} to @code{CHAR} with @code{ALTER -TABLE}. This will force MySQL to use fixed-size rows. -Fixed-size rows take a little extra space, but are much more tolerant to -corruption! - -The current dynamic row code has been in use at MySQL AB for at -least 3 years without any problems, but by nature dynamic-length rows are -more prone to errors, so it may be a good idea to try the above to see if -it helps! -@end itemize - - -@node Resetting permissions, Full disk, Crashing, Administration Issues -@appendixsubsec How to Reset a Forgotten Root Password - -@cindex passwords, forgotten -@cindex passwords, resetting -@cindex root user, password resetting - -If you never set a @code{root} password for MySQL, then the server will -not require a password at all for connecting as @code{root}. It is -recommended to always set a password for each user. @xref{Security}. - -If you have set a @code{root} password, but forgot what it was, you can -set a new password with the following procedure: - -@enumerate -@item -Take down the @code{mysqld} server by sending a @code{kill} (not @code{kill --9}) to the @code{mysqld} server. The pid is stored in a @file{.pid} -file, which is normally in the MySQL database directory: -@example -shell> kill `cat /mysql-data-directory/hostname.pid` -@end example -You must be either the Unix @code{root} user or the same user @code{mysqld} -runs as to do this. -@item -Restart @code{mysqld} with the @code{--skip-grant-tables} option. -@item -Set a new password with the @code{mysqladmin password} command: -@example -shell> mysqladmin -u root password 'mynewpassword' -@end example -@item -Now you can either stop @code{mysqld} and restart it normally, -or just load the privilege tables with: -@example -shell> mysqladmin -h hostname flush-privileges -@end example -@item -After this, you should be able to connect using the new password. -@end enumerate - -Alternatively, you can set the new password using the @code{mysql} client: -@enumerate -@item -Take down and restart @code{mysqld} with the @code{--skip-grant-tables} -option as described above. -@item -Connect to the @code{mysqld} server with: -@example -shell> mysql -u root mysql -@end example -@item -Issue the following commands in the @code{mysql} client: -@example -mysql> UPDATE user SET Password=PASSWORD('mynewpassword') - -> WHERE User='root'; -mysql> FLUSH PRIVILEGES; -@end example -@item -After this, you should be able to connect using the new password. -@item -You can now stop @code{mysqld} and restart it normally. -@end enumerate - - -@node Full disk, Temporary files, Resetting permissions, Administration Issues -@appendixsubsec How MySQL Handles a Full Disk - -@cindex full disk -@cindex disk full - -@noindent -When a disk-full condition occurs, MySQL does the following: - -@itemize @bullet -@item -It checks once every minute to see whether there is enough space to -write the current row. If there is enough space, it continues as if nothing had -happened. -@item -Every 6 minutes it writes an entry to the log file warning about the disk -full condition. -@end itemize - -@noindent -To alleviate the problem, you can take the following actions: - -@itemize @bullet -@item -To continue, you only have to free enough disk space to insert all records. -@item -To abort the thread, you must send a @code{mysqladmin kill} to the thread. -The thread will be aborted the next time it checks the disk (in 1 minute). -@item -Note that other threads may be waiting for the table that caused the disk -full condition. If you have several ``locked'' threads, killing the one -thread that is waiting on the disk-full condition will allow the other -threads to continue. -@end itemize - -Exceptions to the above behaveour is when you use @code{REPAIR} or -@code{OPTIMIZE} or when the indexes are created in a batch after an -@code{LOAD DATA INFILE} or after an @code{ALTER TABLE} statement. - -All of the above commands may use big temporary files that left to -themself would cause big problems for the rest of the system. If -MySQL gets disk full while doing any of the above operations, -it will remove the big temporary files and mark the table as crashed -(except for @code{ALTER TABLE}, in which the old table will be left -unchanged). - - -@node Temporary files, Problems with mysql.sock, Full disk, Administration Issues -@appendixsubsec Where MySQL Stores Temporary Files - -MySQL uses the value of the @code{TMPDIR} environment variable as -the pathname of the directory in which to store temporary files. If you don't -have @code{TMPDIR} set, MySQL uses the system default, which is -normally @file{/tmp} or @file{/usr/tmp}. If the filesystem containing your -temporary file directory is too small, you should edit @code{safe_mysqld} to -set @code{TMPDIR} to point to a directory in a filesystem where you have -enough space! You can also set the temporary directory using the -@code{--tmpdir} option to @code{mysqld}. - -MySQL creates all temporary files as hidden files. This ensures -that the temporary files will be removed if @code{mysqld} is terminated. The -disadvantage of using hidden files is that you will not see a big temporary -file that fills up the filesystem in which the temporary file directory is -located. - -When sorting (@code{ORDER BY} or @code{GROUP BY}), MySQL normally -uses one or two temporary files. The maximum disk-space needed is: - -@example -(length of what is sorted + sizeof(database pointer)) -* number of matched rows -* 2 -@end example - -@code{sizeof(database pointer)} is usually 4, but may grow in the future for -really big tables. - -For some @code{SELECT} queries, MySQL also creates temporary SQL -tables. These are not hidden and have names of the form @file{SQL_*}. - -@code{ALTER TABLE} creates a temporary table in the same directory as -the original table. - - -@node Problems with mysql.sock, Timezone problems, Temporary files, Administration Issues -@appendixsubsec How to Protect or Change the MySQL Socket File @file{/tmp/mysql.sock} - -@cindex @code{mysql.sock}, protection -@cindex deletion, @code{mysql.sock} - -If you have problems with the fact that anyone can delete the -MySQL communication socket @file{/tmp/mysql.sock}, you can, -on most versions of Unix, protect your @file{/tmp} filesystem by setting -the @code{sticky} bit on it. Log in as @code{root} and do the following: - -@example -shell> chmod +t /tmp -@end example - -This will protect your @file{/tmp} filesystem so that files can be deleted -only by their owners or the superuser (@code{root}). - -You can check if the @code{sticky} bit is set by executing @code{ls -ld /tmp}. -If the last permission bit is @code{t}, the bit is set. - -@cindex changing socket location - -You can change the place where MySQL uses / puts the socket file the -following ways: - -@itemize @bullet -@item -Specify the path in a global or local option file. -For example, put in @code{/etc/my.cnf}: - -@example -[client] -socket=path-for-socket-file - -[mysqld] -socket=path-for-socket-file -@end example -@xref{Option files}. -@item -Specifying this on the command-line to @code{safe_mysqld} and most -clients with the @code{--socket=path-for-socket-file} option. -@item -Specify the path to the socket in the @code{MYSQL_UNIX_PORT} environment -variable. -@item -Defining the path with the @code{configure} option -@code{--with-unix-socket-path=path-for-socket-file}. @xref{configure options}. -@end itemize - -You can test that the socket works with this command: - -@example -shell> mysqladmin --socket=/path/to/socket version -@end example - -@node Timezone problems, , Problems with mysql.sock, Administration Issues -@appendixsubsec Time Zone Problems - -@cindex timezone problems -@cindex problems, timezone - -@tindex TZ environment variable -@tindex Environment variable, TZ - -If you have a problem with @code{SELECT NOW()} returning values in GMT and -not your local time, you have to set the @code{TZ} environment variable to -your current time zone. This should be done for the environment in which -the server runs, for example, in @code{safe_mysqld} or @code{mysql.server}. -@xref{Environment variables}. - - -@node Query Issues, Table Definition Issues, Administration Issues, Problems -@appendixsec Query Related Issues - - -@menu -* Case sensitivity:: Case-Sensitivity in Searches -* Using DATE:: Problems Using @code{DATE} Columns -* Problems with NULL:: Problems with @code{NULL} Values -* Problems with alias:: Problems with @code{alias} -* Deleting from related tables:: Deleting Rows from Related Tables -* No matching rows:: Solving Problems with No Matching Rows -* Problems with float:: Problems with floating-point comparison -@end menu - -@node Case sensitivity, Using DATE, Query Issues, Query Issues -@appendixsubsec Case-Sensitivity in Searches - -@cindex case-sensitivity, in searches -@cindex searching, and case-sensitivity -@cindex Chinese -@cindex Big5 Chinese character encoding - -By default, MySQL searches are case-insensitive (although there are -some character sets that are never case-insensitive, such as @code{czech}). -That means that if you search with @code{col_name LIKE 'a%'}, you will get all -column values that start with @code{A} or @code{a}. If you want to make this -search case-sensitive, use something like @code{INSTR(col_name, "A")=1} to -check a prefix. Or use @code{STRCMP(col_name, "A") = 0} if the column value -must be exactly @code{"A"}. - -Simple comparison operations (@code{>=, >, = , < , <=}, sorting and -grouping) are based on each character's ``sort value''. Characters with -the same sort value (like E, e and é) are treated as the same character! - -In older MySQL versions @code{LIKE} comparisons where done on -the uppercase value of each character (E == e but E <> é). In newer -MySQL versions @code{LIKE} works just like the other comparison -operators. - -If you want a column always to be treated in case-sensitive fashion, -declare it as @code{BINARY}. @xref{CREATE TABLE, , @code{CREATE TABLE}}. - -If you are using Chinese data in the so-called big5 encoding, you want to -make all character columns @code{BINARY}. This works because the sorting -order of big5 encoding characters is based on the order of ASCII codes. - - -@node Using DATE, Problems with NULL, Case sensitivity, Query Issues -@appendixsubsec Problems Using @code{DATE} Columns - -@findex DATE - -@cindex DATE columns, problems -@cindex problems, @code{DATE} columns - -The format of a @code{DATE} value is @code{'YYYY-MM-DD'}. According to ANSI -SQL, no other format is allowed. You should use this format in @code{UPDATE} -expressions and in the WHERE clause of @code{SELECT} statements. For -example: - -@example -mysql> SELECT * FROM tbl_name WHERE date >= '1997-05-05'; -@end example - -As a convenience, MySQL automatically converts a date to a number if -the date is used in a numeric context (and vice versa). It is also smart -enough to allow a ``relaxed'' string form when updating and in a @code{WHERE} -clause that compares a date to a @code{TIMESTAMP}, @code{DATE}, or a -@code{DATETIME} column. (Relaxed form means that any punctuation character -may be used as the separator between parts. For example, @code{'1998-08-15'} -and @code{'1998#08#15'} are equivalent.) MySQL can also convert a -string containing no separators (such as @code{'19980815'}), provided it -makes sense as a date. - -The special date @code{'0000-00-00'} can be stored and retrieved as -@code{'0000-00-00'.} When using a @code{'0000-00-00'} date through -@code{MyODBC}, it will automatically be converted to @code{NULL} in -@code{MyODBC} Version 2.50.12 and above, because ODBC can't handle this kind of -date. - -Because MySQL performs the conversions described above, the following -statements work: - -@example -mysql> INSERT INTO tbl_name (idate) VALUES (19970505); -mysql> INSERT INTO tbl_name (idate) VALUES ('19970505'); -mysql> INSERT INTO tbl_name (idate) VALUES ('97-05-05'); -mysql> INSERT INTO tbl_name (idate) VALUES ('1997.05.05'); -mysql> INSERT INTO tbl_name (idate) VALUES ('1997 05 05'); -mysql> INSERT INTO tbl_name (idate) VALUES ('0000-00-00'); - -mysql> SELECT idate FROM tbl_name WHERE idate >= '1997-05-05'; -mysql> SELECT idate FROM tbl_name WHERE idate >= 19970505; -mysql> SELECT MOD(idate,100) FROM tbl_name WHERE idate >= 19970505; -mysql> SELECT idate FROM tbl_name WHERE idate >= '19970505'; -@end example - -@noindent -However, the following will not work: - -@example -mysql> SELECT idate FROM tbl_name WHERE STRCMP(idate,'19970505')=0; -@end example - -@code{STRCMP()} is a string function, so it converts @code{idate} to -a string and performs a string comparison. It does not convert -@code{'19970505'} to a date and perform a date comparison. - -Note that MySQL does very limited checking whether the date is -correct. If you store an incorrect date, such as @code{'1998-2-31'}, the -wrong date will be stored. - -Because MySQL packs dates for storage, it can't store any given date as -it would not fit onto the result buffer. The rules for accepting a date -are: -@itemize @bullet -@item -If MySQL can store and retrieve a given date, the wrong date is accepted -for @code{DATE} and @code{DATETIME} columns. -@item -All days values between 0-31 are accepted for any date. This makes it -very convenient for web applications where you ask year, month and day -in 3 different fields. -@item -The day or month field may be zero. This is convenient if you want -to store a birthdate in a @code{DATE} column and you only know part -of the date. -@end itemize - -If the date cannot be converted to any reasonable value, a @code{0} is -stored in the @code{DATE} field, which will be retrieved as -@code{0000-00-00}. This is both a speed and convenience issue as we -believe that the database's responsiblity is to retrieve the same date -you stored (even if the data was not logically correct in all cases). -We think it is up to the application to check the dates, and not the server. - -@node Problems with NULL, Problems with alias, Using DATE, Query Issues -@appendixsubsec Problems with @code{NULL} Values - -@cindex @code{NULL} values, vs. empty values - -@tindex NULL - -The concept of the @code{NULL} value is a common source of confusion for -newcomers to SQL, who often think that @code{NULL} is the same thing as an -empty string @code{""}. This is not the case! For example, the following -statements are completely different: - -@example -mysql> INSERT INTO my_table (phone) VALUES (NULL); -mysql> INSERT INTO my_table (phone) VALUES (""); -@end example - -Both statements insert a value into the @code{phone} column, but the first -inserts a @code{NULL} value and the second inserts an empty string. The -meaning of the first can be regarded as ``phone number is not known'' and the -meaning of the second can be regarded as ``she has no phone''. - -In SQL, the @code{NULL} value is always false in comparison to any -other value, even @code{NULL}. An expression that contains @code{NULL} -always produces a @code{NULL} value unless otherwise indicated in -the documentation for the operators and functions involved in the -expression. All columns in the following example return @code{NULL}: - -@example -mysql> SELECT NULL,1+NULL,CONCAT('Invisible',NULL); -@end example - -If you want to search for column values that are @code{NULL}, you -cannot use the @code{=NULL} test. The following statement returns no -rows, because @code{expr = NULL} is FALSE, for any expression: - -@example -mysql> SELECT * FROM my_table WHERE phone = NULL; -@end example - -To look for @code{NULL} values, you must use the @code{IS NULL} test. -The following shows how to find the @code{NULL} phone number and the -empty phone number: - -@example -mysql> SELECT * FROM my_table WHERE phone IS NULL; -mysql> SELECT * FROM my_table WHERE phone = ""; -@end example - -Note that you can only add an index on a column that can have @code{NULL} -values if you are using MySQL Version 3.23.2 or newer and are using the -@code{MyISAM} or @code{InnoDB} table type. -In earlier versions and with other table types, you must declare such -columns @code{NOT NULL}. This also means you cannot then insert -@code{NULL} into an indexed column. - -@findex LOAD DATA INFILE -When reading data with @code{LOAD DATA INFILE}, empty columns are updated -with @code{''}. If you want a @code{NULL} value in a column, you should use -@code{\N} in the text file. The literal word @code{'NULL'} may also be used -under some circumstances. -@xref{LOAD DATA, , @code{LOAD DATA}}. - -When using @code{ORDER BY}, @code{NULL} values are presented first. If you -sort in descending order using @code{DESC}, @code{NULL} values are presented -last. When using @code{GROUP BY}, all @code{NULL} values are regarded as -equal. - -To help with @code{NULL} handling, you can use the @code{IS NULL} and -@code{IS NOT NULL} operators and the @code{IFNULL()} function. - -@cindex @code{TIMESTAMP}, and @code{NULL} values -@cindex @code{AUTO_INCREMENT}, and @code{NULL} values -@cindex @code{NULL} values, and @code{TIMESTAMP} columns -@cindex @code{NULL} values, and @code{AUTO_INCREMENT} columns -For some column types, @code{NULL} values are handled specially. If you -insert @code{NULL} into the first @code{TIMESTAMP} column of a table, the -current date and time is inserted. If you insert @code{NULL} into an -@code{AUTO_INCREMENT} column, the next number in the sequence is inserted. - - -@node Problems with alias, Deleting from related tables, Problems with NULL, Query Issues -@appendixsubsec Problems with @code{alias} - -@tindex alias - -You can use an alias to refer to a column in the @code{GROUP BY}, -@code{ORDER BY}, or in the @code{HAVING} part. Aliases can also be used -to give columns better names: - -@example -SELECT SQRT(a*b) as rt FROM table_name GROUP BY rt HAVING rt > 0; -SELECT id,COUNT(*) AS cnt FROM table_name GROUP BY id HAVING cnt > 0; -SELECT id AS "Customer identity" FROM table_name; -@end example - -Note that ANSI SQL doesn't allow you to refer to an alias in a -@code{WHERE} clause. This is because when the @code{WHERE} code is -executed the column value may not yet be determined. For example, the -following query is @strong{illegal}: - -@example -SELECT id,COUNT(*) AS cnt FROM table_name WHERE cnt > 0 GROUP BY id; -@end example - -The @code{WHERE} statement is executed to determine which rows should -be included in the @code{GROUP BY} part while @code{HAVING} is used to -decide which rows from the result set should be used. - - -@node Deleting from related tables, No matching rows, Problems with alias, Query Issues -@appendixsubsec Deleting Rows from Related Tables - -@cindex deleting, rows -@cindex rows, deleting -@cindex tables, deleting rows - -As MySQL doesn't yet support subselects, nor the use of more than one -table in the @code{DELETE} statement (prior to Version 4.0), you should -use the following approach to delete rows from 2 related tables: - -@enumerate -@item -@code{SELECT} the rows based on some @code{WHERE} condition in the main table. -@item -@code{DELETE} the rows in the main table based on the same condition. -@item -@code{DELETE FROM related_table WHERE related_column IN (selected_rows)}. -@end enumerate - -If the total number of characters in the query with -@code{related_column} is more than 1,048,576 (the default value of -@code{max_allowed_packet}, you should split it into smaller parts and -execute multiple @code{DELETE} statements. You will probably get the -fastest @code{DELETE} by only deleting 100-1000 @code{related_column} -id's per query if the @code{related_column} is an index. If the -@code{related_column} isn't an index, the speed is independent of the -number of arguments in the @code{IN} clause. - - -@node No matching rows, Problems with float, Deleting from related tables, Query Issues -@appendixsubsec Solving Problems with No Matching Rows - -@cindex no matching rows -@cindex rows, matching problems - -If you have a complicated query that has many tables and that doesn't -return any rows, you should use the following procedure to find out what -is wrong with your query: - -@enumerate -@item -Test the query with @code{EXPLAIN} and check if you can find something that is -obviously wrong. @xref{EXPLAIN, , @code{EXPLAIN}}. - -@item -Select only those fields that are used in the @code{WHERE} clause. - -@item -Remove one table at a time from the query until it returns some rows. -If the tables are big, it's a good idea to use @code{LIMIT 10} with the query. - -@item -Do a @code{SELECT} for the column that should have matched a row against -the table that was last removed from the query. - -@item -If you are comparing @code{FLOAT} or @code{DOUBLE} columns with numbers that -have decimals, you can't use @code{'='}. This problem is common in most -computer languages because floating-point values are not exact values. -In most cases, changing the @code{FLOAT} to a @code{DOUBLE} will fix this. -@xref{Problems with float}. - -@item -If you still can't figure out what's wrong, create a minimal test that can -be run with @code{mysql test < query.sql} that shows your problems. -You can create a test file with @code{mysqldump --quick database tables > query.sql}. Open the file in an editor, remove some insert lines (if there are -too many of these), and add your select statement at the end of the file. - -Test that you still have your problem by doing: - -@example -shell> mysqladmin create test2 -shell> mysql test2 < query.sql -@end example - -Post the test file using @code{mysqlbug} to @email{mysql@@lists.mysql.com}. -@end enumerate - -@node Problems with float, , No matching rows, Query Issues -@appendixsubsec Problems with Floating-Point Comparison - -floating-point numbers cause confusion sometimes, because these numbers -are not stored as exact values inside computer architecture. What one -can see on the screen usually is not the exact value of the number. - -Field types @code{FLOAT}, @code{DOUBLE} and @code{DECIMAL} are such. - -@example -CREATE TABLE t1 (i INT, d1 DECIMAL(9,2), d2 DECIMAL(9,2)); -INSERT INTO t1 VALUES (1, 101.40, 21.40), (1, -80.00, 0.00), -(2, 0.00, 0.00), (2, -13.20, 0.00), (2, 59.60, 46.40), -(2, 30.40, 30.40), (3, 37.00, 7.40), (3, -29.60, 0.00), -(4, 60.00, 15.40), (4, -10.60, 0.00), (4, -34.00, 0.00), -(5, 33.00, 0.00), (5, -25.80, 0.00), (5, 0.00, 7.20), -(6, 0.00, 0.00), (6, -51.40, 0.00); - -mysql> SELECT i, SUM(d1) AS a, SUM(d2) AS b - -> FROM t1 GROUP BY i HAVING a <> b; -+------+--------+-------+ -| i | a | b | -+------+--------+-------+ -| 1 | 21.40 | 21.40 | -| 2 | 76.80 | 76.80 | -| 3 | 7.40 | 7.40 | -| 4 | 15.40 | 15.40 | -| 5 | 7.20 | 7.20 | -| 6 | -51.40 | 0.00 | -+------+--------+-------+ -@end example - -The result is correct. Although the first five records look like they -shouldn't pass the comparison test, they may do so because the -difference between the numbers show up around tenth decimal, or so -depending on computer architecture. - -The problem cannot be solved by using ROUND() (or similar function), -because the result is still a floating-point number. Example: - -@example -mysql> SELECT i, ROUND(SUM(d1), 2) AS a, ROUND(SUM(d2), 2) AS b - -> FROM t1 GROUP BY i HAVING a <> b; -+------+--------+-------+ -| i | a | b | -+------+--------+-------+ -| 1 | 21.40 | 21.40 | -| 2 | 76.80 | 76.80 | -| 3 | 7.40 | 7.40 | -| 4 | 15.40 | 15.40 | -| 5 | 7.20 | 7.20 | -| 6 | -51.40 | 0.00 | -+------+--------+-------+ -@end example - -This is what the numbers in row 'a' look like: -@example -mysql> SELECT i, ROUND(SUM(d1), 2)*1.0000000000000000 AS a, - -> ROUND(SUM(d2), 2) AS b FROM t1 GROUP BY i HAVING a <> b; -+------+----------------------+-------+ -| i | a | b | -+------+----------------------+-------+ -| 1 | 21.3999999999999986 | 21.40 | -| 2 | 76.7999999999999972 | 76.80 | -| 3 | 7.4000000000000004 | 7.40 | -| 4 | 15.4000000000000004 | 15.40 | -| 5 | 7.2000000000000002 | 7.20 | -| 6 | -51.3999999999999986 | 0.00 | -+------+----------------------+-------+ -@end example - -Depending on the computer architecture you may or may not see similar results. -Each CPU may evaluate floating-point numbers differently. For example in -some machines you may get 'right' results by multiplaying both arguments -with 1, an example follows. - -@strong{WARNING: NEVER TRUST THIS METHOD IN YOUR APPLICATION, THIS IS -AN EXAMPLE OF A WRONG METHOD!!!} - -@example -mysql> SELECT i, ROUND(SUM(d1), 2)*1 AS a, ROUND(SUM(d2), 2)*1 AS b - -> FROM t1 GROUP BY i HAVING a <> b; -+------+--------+------+ -| i | a | b | -+------+--------+------+ -| 6 | -51.40 | 0.00 | -+------+--------+------+ -@end example - -The reason why the above example seems to be working is that on the -particular machine where the test was done, the CPU floating-point -arithmetics happens to round the numbers to same, but there is no -rule that any CPU should do so, so it cannot be trusted. - -The correct way to do floating-point number comparison is to first -decide on what is the wanted tolerance between the numbers and then do -the comparsion against the tolerance number. For example, if we agree on -that floating-point numbers should be regarded the same, if they are -same with precision of one of ten thousand (0.0001), the comparsion -should be done like this: - -@example -mysql> SELECT i, SUM(d1) AS a, SUM(d2) AS b FROM t1 - -> GROUP BY i HAVING ABS(a - b) > 0.0001; -+------+--------+------+ -| i | a | b | -+------+--------+------+ -| 6 | -51.40 | 0.00 | -+------+--------+------+ -1 row in set (0.00 sec) -@end example - -And vice versa, if we wanted to get rows where the numbers are the same, -the test would be: - -@example -mysql> SELECT i, SUM(d1) AS a, SUM(d2) AS b FROM t1 - -> GROUP BY i HAVING ABS(a - b) < 0.0001; -+------+-------+-------+ -| i | a | b | -+------+-------+-------+ -| 1 | 21.40 | 21.40 | -| 2 | 76.80 | 76.80 | -| 3 | 7.40 | 7.40 | -| 4 | 15.40 | 15.40 | -| 5 | 7.20 | 7.20 | -+------+-------+-------+ -@end example - -@node Table Definition Issues, , Query Issues, Problems -@appendixsec Table Definition Related Issues - - -@menu -* ALTER TABLE problems:: Problems with @code{ALTER TABLE}. -* Change column order:: How To Change the Order of Columns in a Table -* Temporary table problems:: TEMPORARY TABLE problems -@end menu - -@node ALTER TABLE problems, Change column order, Table Definition Issues, Table Definition Issues -@appendixsubsec Problems with @code{ALTER TABLE}. - -@tindex ALTER TABLE -@cindex changing, table -@cindex table, changing - -@code{ALTER TABLE} changes a table to the current character set. -If you during @code{ALTER TABLE} get a duplicate key error, then the cause -is either that the new character sets maps to keys to the same value -or that the table is corrupted, in which case you should run -@code{REPAIR TABLE} on the table. - -If @code{ALTER TABLE} dies with an error like this: - -@example -Error on rename of './database/name.frm' to './database/B-a.frm' (Errcode: 17) -@end example - -the problem may be that MySQL has crashed in a previous @code{ALTER -TABLE} and there is an old table named @file{A-something} or -@file{B-something} lying around. In this case, go to the MySQL data -directory and delete all files that have names starting with @code{A-} or -@code{B-}. (You may want to move them elsewhere instead of deleting them.) - -@code{ALTER TABLE} works the following way: - -@itemize @bullet -@item Create a new table named @file{A-xxx} with the requested changes. -@item All rows from the old table are copied to @file{A-xxx}. -@item The old table is renamed @file{B-xxx}. -@item @file{A-xxx} is renamed to your old table name. -@item @file{B-xxx} is deleted. -@end itemize - -If something goes wrong with the renaming operation, MySQL tries to -undo the changes. If something goes seriously wrong (this shouldn't happen, -of course), MySQL may leave the old table as @file{B-xxx}, but a -simple rename on the system level should get your data back. - - -@node Change column order, Temporary table problems, ALTER TABLE problems, Table Definition Issues -@appendixsubsec How To Change the Order of Columns in a Table - -@cindex reordering, columns -@cindex columns, changing -@cindex changing, column order -@cindex tables, changing column order - -The whole point of SQL is to abstract the application from the data -storage format. You should always specify the order in which you wish to -retrieve your data. For example: - -@example -SELECT col_name1, col_name2, col_name3 FROM tbl_name; -@end example - -will return columns in the order @code{col_name1}, @code{col_name2}, @code{col_name3}, whereas: - -@example -SELECT col_name1, col_name3, col_name2 FROM tbl_name; -@end example - -will return columns in the order @code{col_name1}, @code{col_name3}, @code{col_name2}. - -You should @strong{never}, in an application, use @code{SELECT *} and -retrieve the columns based on their position, because the order in which -columns are returned @strong{cannot} be guaranteed over time. A simple -change to your database may cause your application to fail rather -dramatically. - -If you want to change the order of columns anyway, you can do it as follows: - -@enumerate -@item -Create a new table with the columns in the right order. -@item -Execute -@code{INSERT INTO new_table SELECT fields-in-new_table-order FROM old_table}. -@item -Drop or rename @code{old_table}. -@item -@code{ALTER TABLE new_table RENAME old_table}. -@end enumerate - - -@node Temporary table problems, , Change column order, Table Definition Issues -@appendixsubsec TEMPORARY TABLE problems - -@cindex temporary tables, problems - -The following are a list of the limitations with @code{TEMPORARY TABLES}. - -@itemize @bullet -@item -A temporary table can only be of type @code{HEAP}, @code{ISAM}, -@code{MyISAM} or @code{InnoDB}. -@item -You can't use temporary tables more than once in the same query. -For example, the following doesn't work. - -@example -mysql> SELECT * FROM temporary_table, temporary_table AS t2; -@end example - -We plan to fix the above in 4.0. -@item -You can't use @code{RENAME} on a @code{TEMPORARY} table. -Note that @code{ALTER TABLE org_name RENAME new_name} works! - -We plan to fix the above in 4.0. -@end itemize - - - - -@node Contrib, Credits, Problems, Top -@appendix Contributed Programs - -@cindex contributed programs -@cindex programs, contributed - -Many users of MySQL have contributed @emph{very} useful support -tools and add-ons. - -A list of what is available at -@uref{http://www.mysql.com/Downloads/Contrib/} -(or any mirror) is shown here. - -Please visit our Software Portal at -@uref{http://www.mysql.com/portal/software/}. -The community facilities there also allow for your input! - -If you want to build MySQL support for the Perl @code{DBI}/@code{DBD} -interface, you should fetch the @code{Data-Dumper}, @code{DBI}, and -@code{Msql-Mysql-modules} files and install them. -@xref{Perl support}. - -Note: The programs listed here can be freely downloaded and used. -They are copyrighted by their respective owners. -Please see individual product documentation for more details on licensing and terms. -MySQL AB assumes no liability for the correctness of the information in this -chapter or for the proper operation of the programs listed herein. - -@appendixsec APIs - -@cindex Perl, modules -@itemize @bullet -@item Perl Modules -@itemize @minus -@item @uref{http://www.mysql.com/Downloads/Contrib/Data-Dumper-2.101.tar.gz} -Perl @code{Data-Dumper} module. Useful with @code{DBI}/@code{DBD} support for -older Perl installations. - -@item @uref{http://www.mysql.com/Downloads/Contrib/DBI-1.18.tar.gz} -Perl @code{DBI} module. - -@item @uref{http://www.mysql.com/Downloads/Contrib/KAMXbase1.2.tar.gz} -Convert between @file{.dbf} files and MySQL tables. Perl -module written by Pratap Pereira @email{pereira@@ee.eng.ohio-state.edu}, -extended by Kevin A. McGrail @email{kmcgrail@@digital1.peregrinehw.com}. -This converter can handle MEMO fields. - -@item @uref{http://www.mysql.com/Downloads/Contrib/Msql-Mysql-modules-1.2218.tar.gz} -Perl @code{DBD} module to access mSQL and MySQL databases. - -@item @uref{http://www.mysql.com/Downloads/Contrib/Data-ShowTable-3.3.tar.gz} -Perl @code{Data-ShowTable} module. Useful with @code{DBI}/@code{DBD} support. - -@item @uref{http://www.mysql.com/Downloads/Contrib/HandySQL-1.1.tar.gz} -HandySQL is a MySQL access module. It offers a C interface embedded in Perl and is -approximately 20% faster than regular DBI. - -@end itemize - -@cindex JDBC -@item JDBC -@itemize @bullet -@item @uref{http://www.mysql.com/Downloads/Contrib/mm.mysql.jdbc-1.2c.tar.gz} -The mm JDBC driver for MySQL. This is a production release -and is actively developed. By Mark Matthews -(@email{mmatthew@@ecn.purdue.edu}). - -@item @uref{http://www.mysql.com/Downloads/Contrib/mm.mysql.jdbc-2.0pre5.tar.gz} -The mm JDBC driver for MySQL. This is a pre-release beta version -and is actively developed. By Mark Matthews -(@email{mmatthew@@ecn.purdue.edu}). -The two drivers above have an LGPL -license. Please check @uref{http://www.worldserver.com/mm.mysql/} for -the latest drivers (and other JDBC information) because these drivers may be out of date. - -@item @uref{http://www.caucho.com/projects/jdbc-mysql/index.xtp} -The Resin commercial JDBC driver, which is released under @code{Open Source}. -It claims to be faster than the mm driver, but we haven't received that much -information about this yet. - -@item @uref{http://www.mysql.com/Downloads/Contrib/twz1jdbcForMysql-1.0.4-GA.tar.gz} -The twz driver: A type 4 JDBC driver by Terrence W. Zellers -@email{zellert@@voicenet.com}. This is commercial but is free for -private and educational use. (Not supported anymore.) -@c no answer from server 990830 -@c You can always find the latest driver at @uref{http://www.voicenet.com/~zellert/tjFM/}. -@item @uref{http://www.mysql.com/Downloads/Contrib/pmdamysql.tgz} -A MySQL PMDA. Provides MySQL server status and configuration -variables. -@end itemize - -@cindex OLEDB -@item OLEDB -@itemize @bullet -@item @uref{http://www.mysql.com/Downloads/Win32/MyOLEDB3.exe} -MyOLEDB 3.0 installation package from SWSoft. -@item @uref{http://www.mysql.com/Downloads/Win32/mysql-oledb-3.0.0.zip} -Source for MyOLEDB 3.0. -@item @uref{http://www.mysql.com/Downloads/Win32/MySamples.zip} -Examples and documentation for MyOLEDB. -@item @uref{http://www.mysql.com/Downloads/Win32/MyOLEDB.chm} -Help files for MyOLEDB. -@item @uref{http://www.mysql.com/Downloads/Win32/libmyodbc.zip} -Static MyODBC library used for build MyOLEDB. Based on MyODBC code. -@end itemize - -@cindex C++ -@item C++ -@itemize @bullet - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql-c++-0.02.tar.gz} -MySQL C++ wrapper library. By Roland Haenel, -@email{rh@@ginster.net}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MyDAO.tar.gz} -MySQL C++ API. By Satish @email{spitfire@@pn3.vsnl.net.in}. Inspired -by Roland Haenel's C++ API and Ed Carp's MyC library. - -@item @uref{http://www.mysql.com/download_mysql++.html} -MySQL C++ API (more than just a wrapper library). Originally by -@email{kevina@@clark.net}. Nowadays maintained by Sinisa at MySQL AB. - -@item @uref{http://nelsonjr.homepage.com/NJrAPI/} -A C++ database independent library that supports MySQL. -@end itemize - -@cindex Delphi -@item Delphi -@itemize @bullet - -@item @uref{http://www.mysql.com/Downloads/Contrib/DelphiMySQL2.zip} -Delphi interface to @code{libmysql.dll}, by @email{bsilva@@umesd.k12.or.us}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/Udmysql.pas} -A wrapper for libmysql.dll for usage in Delphi. By Reiner Sombrowsky. - -@item @uref{http://www.fichtner.net/delphi/mysql.delphi.phtml} -A Delphi Interface to MySQL, with source code. By Matthias Fichtner. - -@item @uref{http://www.productivity.org/projects/tmysql/} -@code{TmySQL}, a library to use MySQL with Delphi. - -@item @uref{https://sourceforge.net/projects/zeoslib/} -Zeos Library is a set of delphi native datasets and database -components for MySql, PostgreSql, Interbase, MS SQL, Oracle, -DB/2. Also it includes development tools such as Database -Explorer and Database Designer. - -@item @uref{http://www.mysql.com/Downloads/Contrib/Win32/SBMySQL50Share.exe} -Delphi 5 Shareware MySQL Dataset Components. -@end itemize - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql-ruby-2.2.0.tar.gz} -MySQL Ruby module. By TOMITA Masahiro @email{tommy@@tmtm.org} -Ruby is an Object-Oriented Interpreter Language -(@uref{http://www.netlab.co.jp/ruby/}). - -@item @uref{http://www.mysql.com/Downloads/Contrib/JdmMysqlDriver-0.1.0.tar.gz} -A VisualWorks 3.0 Smalltalk driver for MySQL. By -@email{joshmiller@@earthlink.net}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/Db.py} -Python module with caching. By @email{gandalf@@rosmail.com}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MySQLmodule-1.4.tar.gz} -Python interface for MySQL. By Joseph Skinner @email{joe@@earthlight.co.nz}. Modified by Joerg Senekowitsch @email{senekow@@ibm.net}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MySQL-python-0.3.0.tar.gz} -MySQLdb Python is an DB-API v2.0-compliant interface to MySQL. Transactions -are supported if the server and tables support them. It is -thread-safe, and contains a compatibility module for older code -written for the no-longer-maintained MySQLmodule interface. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql_mex_12.tar.gz} -An interface program for the Matlab program by MathWorks. The interface -is done by Kimmo Uutela and John Fisher (not by Mathworks). -Check @uref{http://boojum.hut.fi/~kuutela/mysqlmex.html} -for more information. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysqltcl-1.53.tar.gz} -Tcl interface for MySQL. Based on @file{msqltcl-1.50.tar.gz}. -For version 2.0 and more info, see @uref{http://www.xdobry.de/mysqltcl/}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MyC-0.1.tar.gz} -A Visual Basic-like API, by Ed Carp. - -@item @uref{http://www.mysql.com/Downloads/Contrib/Vdb-dflts-2.1.tar.gz} -This is a new version of a set of library utilities intended -to provide a generic interface to SQL database engines such that your -application becomes a 3-tiered application. The advantage is that you -can easily switch between and move to other database engines by -implementing one file for the new backend without making any -changes to your applications. By @email{damian@@cablenet.net}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/DbFramework-1.10.tar.gz} -DbFramework is a collection of classes for manipulating MySQL -databases. The classes are loosely based on the CDIF Data Model -Subject Area. By Paul Sharpe @email{paul@@miraclefish.com}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/pike-mysql-1.4.tar.gz} -MySQL module for pike. For use with the Roxen web server. - -@item @uref{http://www.mysql.com/Downloads/Contrib/squile.tar.gz} -Module for @code{guile} that allows @code{guile} to interact with SQL -databases. By Hal Roberts. - -@item @uref{http://www.mysql.com/Downloads/Contrib/stk-mysql.tar.gz} -Interface for Stk. Stk is the Tk widgets with Scheme underneath instead of Tcl. -By Terry Jones. - -@item @uref{http://www.mysql.com/Downloads/Contrib/eiffel-wrapper-1.0.tar.gz} -Eiffel wrapper by Michael Ravits. - -@item @uref{http://www.mysql.com/Downloads/Contrib/SQLmy0.06.tgz} -FlagShip Replaceable Database Driver (RDD) for MySQL. By Alejandro -Fernandez Herrero. -The Flagship RDD homepage is at @uref{http://www.fship.com/rdds.html}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mydsn-1.0.zip} -Binary and source for @code{mydsn.dll}. mydsn should be used to build -and remove the DSN registry file for the MyODBC driver in Coldfusion -applications. By Miguel Angel Solórzano. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MySQL-ADA95_API.zip} -An ADA95 interface to the MySQL API. By Francois Fabien. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MyTool-DLL_for_VB_and_MySQL.zip} -A DLL with MySQL C API for Visual Basic. -By Ken Menzel @email{kenm@@icarz.com}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MYSQLX.EXE} -MySQL ActiveX Object for directly accessing your MySQL -servers from IIS/ASP, VB, VC++ skipping the slower ODBC methods. Fully -updatable, multi-threaded with full support for all MySQL fieldtypes -(version 2001.1.1). By SciBit @uref{http://www.scibit.com/}. - -@item @uref{http://www.fastflow.it/mylua/} -MyLUA home page; how to use the LUA language to write MySQL -@code{PROCEDURE} that can be loaded runtime. - -@itemize @bullet -@item @uref{http://www.mysql.com/Downloads/Contrib/lua-4.0.tar.gz} -LUA 4.0 -@item @uref{http://www.mysql.com/Downloads/Contrib/mylua-3.23.32.1.tar.gz} -Patch for MySQL 3.23.32 to use LUA 4.0. By Cristian Giussani. -@end itemize - -@item @uref{http://www.mysql.com/Downloads/Contrib/patched_myodbc.zip} -Patch (for Omniform 4.0 support) to the MyODBC driver. -By Thomas Thaele @email{tthaele@@papenmeier.de} - -@end itemize - -@appendixsec Clients - -@cindex web tools -@cindex tools,, web -@appendixsec Web Tools - -@itemize @bullet - -@item @uref{http://htcheck.sourceforge.net/} -htCheck is a URL checker with -MySQL backend. Spidered URLs can later be queried using SQL to retrieve -various kinds of information, eg. broken links. Written by Gabriele Bartolini. - -@item @uref{http://www.odbsoft.com/cook/sources.htm} -This package has various functions for generating html code from a SQL -table structure and for generating SQL statements (Select, Insert, -Update, Delete) from an html form. You can build a complete forms -interface to a SQL database (query, add, update, delete) without any -programming! By Marc Beneteau, @email{marc@@odbsoft.com}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/sqlhtml.tar.gz} -SQL/HTML is an HTML database manager for MySQL using @code{DBI} 1.06. - -@item @uref{http://www.mysql.com/Downloads/Contrib/udmsearch-3.0.23.tar.gz} (UdmSearch 3.0.23, stable version). -@item @uref{http://www.mysql.com/Downloads/Contrib/mnogosearch-3.1.12.tar.gz} (mnogosearch 3.1.12, development but recommended version) -@item @uref{http://search.mnoGo.ru/} (UdmSearch home page) -A SQL-based search engine for Internet. By -Alexander I. Barkov @email{bar@@izhcom.ru}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/wmtcl.doc} -@item @uref{http://www.mysql.com/Downloads/Contrib/wmtcl.lex} -With this you can write HTML files with inclusions of Tcl code. By -@email{vvs@@scil.npi.msu.su}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/www-sql-0.5.7.lsm} -@item @uref{http://www.mysql.com/Downloads/Contrib/www-sql-0.5.7.tar.gz} -A CGI program that parses an HTML file containing special tags, parses -them, and inserts data from a MySQL database. - -@item @uref{http://www.mysql.com/Downloads/Contrib/genquery.zip} -Perl SQL database interface package for html. - -@item @uref{http://www.mysql.com/Downloads/Contrib/cgi++-0.8.tar.gz} -A macro-processor to simply writing CGI/Database programs in C++ by Sasha Pachev. - -@item @uref{http://www.mysql.com/Downloads/Contrib/webboard-1.0.zip} -WebBoard 1.0, EU-Industries Internet-Message-Board. - -@item @uref{http://www.mysql.com/Downloads/Contrib/DBIx-TextIndex-0.02.tar.gz} -Full-text searching with Perl on @code{BLOB}/@code{TEXT} columns by Daniel Koch. -@end itemize - -@cindex tools, benchmarking -@cindex benchmarking, tools -@appendixsec Performance Benchmarking Tools - -@itemize @bullet -@item @uref{http://www.mysql.com/Downloads/super-smack/super-smack-1.0.tar.gz} -super-smack is a multi-threaded benchmarking tool for MySQL and -@strong{PostgreSQL}. Written in C++. Easy to extend to support other -databases that have C/C++ client libraries. By Sasha Pachev. -@end itemize - -@cindex tools, authentication -@cindex authentication tools -@appendixsec Authentication Tools - -@itemize @bullet -@item @uref{http://www.mysql.com/Downloads/Contrib/ascend-radius-mysql-0.7.2.patch.gz} -This is an authentication and logging patch using MySQL for -Ascend-Radius. By @email{takeshi@@SoftAgency.co.jp}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/icradius-0.10.tar.gz} (icradius 0.10) -@uref{http://www.mysql.com/Downloads/Contrib/icradius.README} (icradius readme) - -@item @uref{http://www.mysql.com/Downloads/Contrib/checkpassword-0.81-mysql-0.6.6.patch.gz} -MySQL authentication patch for QMAIL and checkpassword. These are -useful for management user (mail, pop account) by MySQL. -By @email{takeshi@@SoftAgency.co.jp}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/jradius-diff.gz} -MySQL support for Livingston's Radius 2.01. Authentication and -Accounting. By Jose de Leon, @email{jdl@@thevision.net}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mod_auth_mysql-2.20.tar.gz} -Apache authentication module for MySQL. By Zeev Suraski, -@email{bourbon@@netvision.net.il}. - -@c @strong{Please} register this module at: -@c @uref{http://bourbon.netvision.net.il/mysql/mod_auth_mysql/register.html}. The -@c registering information is only used for statistical purposes and will -@c encourage further development of this module! - -@item @uref{http://www.mysql.com/Downloads/Contrib/mypasswd-2.0.tar.gz} -Extra for @code{mod_auth_mysql}. This is a little tool that allows you -to add/change user records storing group and/or password entries in -MySQL tables. By Harry Brueckner, @email{brueckner@@respublica.de}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql-passwd.README} -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql-passwd-1.2.tar.gz} -Extra for @code{mod_auth_mysql}. This is a two-part system for use with -@code{mod_auth_mysql}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/pam_mysql.tar.gz} -This module authenticates users via @code{pam}, using MySQL. - -@item @uref{http://www.mysql.com/Downloads/Contrib/nsapi_auth_mysql.tar} -Netscape Web Server API (NSAPI) functions to authenticate (BASIC) users -against MySQL tables. By Yuan John Jiang. - -@item @uref{http://www.mysql.com/Downloads/Contrib/qmail-1.03-mysql-0.6.6.patch.gz} -Patch for qmail to authenticate users from a MySQL table. -By @email{takeshi@@SoftAgency.co.jp}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/proftpd-1.2.0rc2-fix-mysql.patch} -Patch for proftpd1.2.0rc2. By @email{takeshi@@SoftAgency.co.jp}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/pwcheck_mysql-0.1.tar.gz} -An authentication module for the Cyrus IMAP server. By Aaron Newsome. - - -@end itemize - -@cindex converters -@appendixsec Converters - -@itemize @bullet -@item @uref{http://www.mysql.com/Downloads/Contrib/mssql2mysql.txt} -Converter from MS-SQL to MySQL. By Michael Kofler. -The mssql2mysql home page is at -@uref{http://www.kofler.cc/mysql/mssql2mysql.html}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/dbf2mysql-1.14.tar.gz} -Convert between @file{.dbf} files and MySQL tables. By Maarten -Boekhold (@email{boekhold@@cindy.et.tudelft.nl}), William Volkman, and -Michael Widenius. This converter includes rudimentary read-only support -for MEMO fields. - -@item @uref{http://www.mysql.com/Downloads/Contrib/dbf2mysql-1.13.tgz} -Convert between @file{.dbf} files and MySQL tables. By Maarten -Boekhold, @email{boekhold@@cindy.et.tudelft.nl}, and Michael Widenius. -This converter can't handle MEMO fields. - -@item @uref{http://www.mysql.com/Downloads/Contrib/dbf2mysql.zip} -Convert between FoxPro @file{.dbf} files and MySQL tables on Windows. -By Alexander Eltsyn, @email{ae@@nica.ru} or @email{ae@@usa.net}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/dbf2sql.zip} -Short and simple prg that can help you transport your data from foxpro -table into MySQL table. By Danko Josic. - -@item @uref{http://www.mysql.com/Downloads/Contrib/dump2h-1.20.gz} -Convert from @code{mysqldump} output to a C header file. By Harry Brueckner, -@email{brueckner@@mail.respublica.de}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/exportsql.txt} -A script that is similar to @code{access_to_mysql.txt}, except that this -one is fully configurable, has better type conversion (including -detection of @code{TIMESTAMP} fields), provides warnings and suggestions -while converting, quotes @strong{all} special characters in text and -binary data, and so on. It will also convert to @code{mSQL} v1 and v2, -and is free of charge for anyone. See -@uref{http://www.cynergi.net/exportsql/} for the latest version. By -Pedro Freire, @email{support@@cynergi.net}. Note: Doesn't work with -Access2! - -@item @uref{http://www.mysql.com/Downloads/Contrib/access_to_mysql.txt} -Paste this function into an Access module of a database that has the -tables you want to export. See also @code{exportsql}. By Brian Andrews. -Note: Doesn't work with Access2! - -@item @uref{http://www.mysql.com/Downloads/Contrib/importsql.txt} -A script that does the exact reverse of @code{exportsql.txt}. That is, -it imports data from MySQL into an Access database via -ODBC. This is very handy when combined with exportsql, because it lets you -use Access for all DB design and administration, and synchronise with -your actual MySQL server either way. Free of charge. See -@uref{http://www.netdive.com/freebies/importsql/} for any updates. -Created by Laurent Bossavit of NetDIVE. -@strong{Note}: doesn't work with Access2! - -@item @uref{http://www.mysql.com/Downloads/Contrib/mdb2sql.bas} -Converter from Access97 to MySQL by Moshe Gurvich. - -@item @uref{http://www.mysql.com/Downloads/Contrib/msql2mysqlWrapper-1.0.tgz} -A C wrapper from @code{mSQL} to MySQL. By @email{alfred@@sb.net} - -@item @uref{http://www.mysql.com/Downloads/Contrib/sqlconv.pl} -A simple script that can be used to copy fields from one MySQL table -to another in bulk. Basically, you can run @code{mysqldump} and pipe it to -the @code{sqlconv.pl} script. The script will parse through the -@code{mysqldump} output and will rearrange the fields so they can be -inserted into a new table. An example is when you want to create a new -table for a different site you are working on, but the table is just a -bit different (that is - fields in different order, etc.). -By Steve Shreeve. -@item @uref{http://www.mysql.com/Downloads/Contrib/oracledump} -Perl program to convert Oracle databases to MySQL. Has same -output format as mysqldump. By Johan Andersson. - -@item @uref{http://www.mysql.com/Downloads/Contrib/excel2mysql} -Perl program to import Excel spreadsheets into a MySQL database. -By Stephen Hurd @email{shurd@@sk.sympatico.ca} - -@item @uref{http://www.mysql.com/Downloads/Contrib/T2S_100.ZIP}. -Windows program to convert text files to MySQL databases. By -Asaf Azulay. - -@end itemize - -@appendixsec Using MySQL with Other Products - -@itemize @bullet -@item @uref{http://www.mysql.com/Downloads/Contrib/emacs-sql-mode.tar.gz} -Raw port of a SQL mode for XEmacs. Supports completion. Original by -Peter D. Pezaris @email{pez@@atlantic2.sbi.com} and partial -MySQL port by David Axmark. - -@item @uref{http://www.mysql.com/Downloads/Win32/myaccess97_1_4.zip} (MyAccess97 1.4) -@item @uref{http://www.mysql.com/Downloads/Win32/myaccess2000_1_4.zip} (MyAccess2000 1.4) - -MyAccess is an AddIn for MS Access 97/2000 that allows you to manage -MySQL databases from within Access. Main functions are: -@itemize @minus -@item Create/Modify Tables -@item Execute Queries against MySQL -@item Extract ''Create Table-Scripts'' from MySQL -@item Import/Export tables from Access to MySQL and vice versa -@item Log Changes -@item Show a "Database Definition Report -@end itemize - -Written by Hubertus Hiden. -The MyAccess homepage is at @uref{http://www.accessmysql.com/}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/radius-0.3.tar.gz} -Patches for @code{radiusd} to make it support MySQL. By Wim Bonis, -@email{bonis@@kiss.de}. -@end itemize - -@cindex utilities -@appendixsec Utilities - -@itemize @bullet -@item @uref{http://worldcommunity.com/opensource/utilities/mysql_backup.html} -MySQL Backup is a backup script for MySQL. By Peter F. Brown. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mytop} -@item @uref{http://public.yahoo.com/~jzawodn/mytop/} (mytop home page) -mytop is a Perl program that allows you to monitor MySQL servers by -viewing active threads, queries, and overall server performance -numbers. By Jeremy D. Zawodny. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql_watchdog.pl} -Monitor the MySQL daemon for possible lockups. By Yermo Lamers, -@email{yml@@yml.com}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysqltop.tar.gz} -Sends a query in a fixed time interval to the server and shows the -resulting table. By Thomas Wana. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql_structure_dumper.tar.gz} -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql_structure_dumper.tgz} -Prints the structure of every table in a database. By Thomas Wana. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysqlsync}. -A Perl script to keep remote copies of a MySQL database in sync with a -central master copy. By Mark Jeftovic. @email{markjr@@easydns.com}. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MySQLTutor-0.2.tar.gz}. -MySQLTutor. A MySQL tutorial for beginners. - -@item @uref{http://www.mysql.com/Downloads/Contrib/MySQLDB.zip} -@item @uref{http://www.mysql.com/Downloads/Contrib/MySQLDB-readme.html}. -A COM library for MySQL by Alok Singh. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mysql_replicate.pl} -Perl program that handles replication. By @email{elble@@icculus.nsg.nwu.edu} - -@item @uref{http://www.mysql.com/Downloads/Contrib/DBIx-TextIndex-0.02.tar.gz} -Perl script that uses reverse indexing to handle text searching. -By Daniel Koch. - -@item @uref{http://www.mysql.com/Downloads/Contrib/dbcheck} -Perl script that takes a backup of tables before running isamchk on them. -By Elizabeth. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mybackup}. -@item @uref{http://www.mswanson.com/mybackup} (mybackup home page) -Wrapper for mysqldump to backup all databases. By Marc Swanson. - -@item @uref{http://www.mysql.com/Downloads/Contrib/mdu.pl.gz} -Prints the storage usage of a MySQL database. -@end itemize - -@page - - - - -@node Credits, News, Contrib, Top -@appendix Credits - -@cindex developers, list of - -This appendix lists the developers, contributors, and supporters that have -helped to make MySQL what it is today. - -@menu -* Developers:: Developers at MySQL AB -* Contributors:: Contributors to MySQL -* Supporters:: Supporters to MySQL -@end menu - - -@node Developers, Contributors, Credits, Credits -@appendixsec Developers at MySQL AB - -These are the developers that are or have been employed by @code{MySQL AB} -to work on the @code{MySQL} database software, roughly in the order they -started to work with us. Following each developer is a small list of the -tasks that the developer is responsible for, or the accomplishments they -have made. All developers are involved in support. - -@c Updated by arjen 2002-08-06 -@c Note: this is a non-exhaustive list. It just documents some notable -@c achievements, not each individual task. Nor is it a complete list -@c of past/present job roles (see above). That said, updates welcome! - -@table @asis -@item Michael (Monty) Widenius -@itemize @bullet -@item -Lead developer and main author of the MySQL server (@code{mysqld}). -@item -New functions for the string library. -@item -Most of the @code{mysys} library. -@item -The @code{ISAM} and @code{MyISAM} libraries (B-tree index file -handlers with index compression and different record formats). -@item -The @code{HEAP} library. A memory table system with our superior full dynamic -hashing. In use since 1981 and published around 1984. -@item -The @code{replace} program (take a look at it, it's @strong{COOL}!). -@item -@code{MyODBC}, the ODBC driver for Windows95. -@item -Fixing bugs in MIT-pthreads to get it to work for MySQL Server. And -also Unireg, a curses-based application tool with many utilities. -@item -Porting of @code{mSQL} tools like @code{msqlperl}, @code{DBD}/@code{DBI}, and -@code{DB2mysql}. -@item -Most of @code{crash-me} and the foundation for the MySQL benchmarks. -@end itemize - -@item David Axmark -@itemize @bullet -@item -Initial main writer of the @strong{Reference Manual}, -including enhancements to @code{texi2html}. -@item -Automatic web site updating from the manual. -@item -Initial Autoconf, Automake, and Libtool support. -@item -Licensing. -@item -Parts of all the text files. (Nowadays only the @file{README} is -left. The rest ended up in the manual.) -@item -Lots of testing of new features. -@item -Our in-house Free Software legal expert. -@item -Mailing list maintainer (who never has the time to do it right...). -@item -Our original portability code (more than 10 years old now). Nowadays -only some parts of @code{mysys} are left. -@item -Someone for Monty to call in the middle of the night when he just got -that new feature to work. -@item -Chief "Open Sourcerer" (MySQL community relations). -@end itemize - -@item Jani Tolonen -@itemize @bullet -@item -@code{mysqlimport} -@item -A lot of extensions to the command-line clients. -@item -@code{PROCEDURE ANALYSE()} -@end itemize - -@item Sinisa Milivojevic -@itemize @bullet -@item -Compression (with @code{zlib}) in the client/server protocol. -@item -Perfect hashing for the lexical analyser phase. -@item -Multi-row @code{INSERT} -@item -@code{mysqldump} -e option -@item -@code{LOAD DATA LOCAL INFILE} -@item -@code{SQL_CALC_FOUND_ROWS} @code{SELECT} option -@item -@code{--max-user-connections=...} option -@item -@code{net_read} and @code{net_write_timeout} -@item -@code{GRANT}/@code{REVOKE} and @code{SHOW GRANTS FOR} -@item -New client-server protocol for 4.0 -@item -@code{UNION} in 4.0 -@item -Multi-table @code{DELETE}/@code{UPDATE} -@item -Derived tables in 4.1 -@item -User resources management -@item -Initial developer of the @code{MySQL++} C++ API and the @code{MySQLGUI} client. -@end itemize - -@item Tonu Samuel (past developer) -@itemize @bullet -@item -VIO interface (the foundation for the encrypted client/server protocol). -@item -MySQL Filesystem (a way to use MySQL databases as files -and directories). -@item -The @code{CASE} expression. -@item -The @code{MD5()} and @code{COALESCE()} functions. -@item -@code{RAID} support for @code{MyISAM} tables. -@end itemize - -@item Sasha Pachev -@itemize @bullet -@item -Initial implementation of replication (upto version 4.0). -@item -@code{SHOW CREATE TABLE}. -@item -@code{mysql-bench} -@end itemize - -@item Matt Wagner -@itemize @bullet -@item -MySQL test suite. -@item -Webmaster (until 2002). -@item -Coordinator of development. -@end itemize - -@item Miguel Solorzano -@itemize @bullet -@item -Win32 development and release builds. -@item -Windows NT server code. -@item -WinMySQLAdmin -@end itemize - -@item Timothy Smith (past developer) -@itemize @bullet -@item -Dynamic character sets support. -@item -configure, RPMs and other parts of the build system. -@item -Initial developer of @code{libmysqld}, the embedded server. -@end itemize - -@item Sergei Golubchik -@itemize @bullet -@item -Full-text search. -@item -Added keys to the @code{MERGE} library. -@end itemize - -@item Jeremy Cole -@itemize @bullet -@item -Proofreading and editing this fine manual. -@item -@code{ALTER TABLE ... ORDER BY ...}. -@item -@code{UPDATE ... ORDER BY ...}. -@item -@code{DELETE ... ORDER BY ...}. -@end itemize - -@item Indrek Siitan -@itemize @bullet -@item -Designing/programming of our web interface. -@item -Author of our newsletter management system. -@end itemize - -@item Jorge del Conde -@itemize @bullet -@item -@code{MyCC} @code{MySQL Control Center}. -@item -Win32 development -@item -Initial implementation of the website portals. -@end itemize - -@item Venu Anuganti -@itemize @bullet -@item -MyODBC 3.51 -@item -New client/server protocol for 4.1 -@end itemize - -@item Arjen Lentz -@itemize @bullet -@item -Maintainer of the MySQL Reference Manual. -@item -Preparing the O'Reilly printed edition of the manual. -@end itemize - -@item Alexander (Bar) Barkov, Alexey (Holyfoot) Botchkov, and Ramil Kallimullin -@itemize @bullet -@item -Spatial data (GIS) and R-Trees implementation for 4.1 -@item -Unicode and character sets for 4.1 -@end itemize - -@item Alexander (Sanja) Belkin -@itemize @bullet -@item -Query cache in 4.0 -@item -Implementation of subqueries (4.1). -@end itemize - -@item Aleksey (Walrus) Kishkin and Alexey (Ranger) Stroganov -@itemize @bullet -@item -Benchmarks design and analysis. -@item -Maintenance of the MySQL test suite. -@end itemize - -@item Zak Greant -@itemize @bullet -@item -Open Source advocate, MySQL community relations. -@end itemize - -@item Carsten Pedersen -@itemize @bullet -@item -The MySQL Certification program. -@end itemize - -@item Lenz Grimmer -@itemize @bullet -@item -Production (build and release) engineering. -@end itemize - -@item Peter Zaitsev -@itemize @bullet -@item -@code{SHA1()}, @code{AES_ENCRYPT()} and @code{AES_DECRYPT()} functions. -@item -Debugging, cleaning up various features. -@end itemize - -@item Alexander (Salle) Keremidarski -@itemize @bullet -@item -Documentation of existing MySQL code/algorithms. -@item -Debugging. -@end itemize - -@item Per-Erik Martin -@itemize @bullet -@item -Lead developer for stored procedures and triggers. -@end itemize - -@item Jim Winstead -@itemize @bullet -@item -Lead web developer. -@end itemize - -@item Mark Matthews -@itemize @bullet -@item -JDBC driver. -@end itemize - -@end table - - -@node Contributors, Supporters, Developers, Credits -@appendixsec Contributors to MySQL - -@cindex contributors, list of - -While @code{MySQL AB} owns all copyrights in the @code{MySQL server} -and the @code{MySQL manual}, we wish to recognise those who have made -contributions of one kind or another to the @code{MySQL distribution}. -Contributors are listed here, in somewhat random order: - -@table @asis -@item Paul DuBois -Ongoing help with making this manual correct and understandable. -That includes rewriting Monty's and David's attempts at English into -English as other people know it. -@item Gianmassimo Vigazzola @email{qwerg@@mbox.vol.it} or @email{qwerg@@tin.it} -The initial port to Win32/NT. -@item Kim Aldale -Helped to rewrite Monty's and David's early attempts at English into -English. -@item Per Eric Olsson -For more or less constructive criticism and real testing of the dynamic -record format. -@item Irena Pancirov @email{irena@@mail.yacc.it} -Win32 port with Borland compiler. @code{mysqlshutdown.exe} and -@code{mysqlwatch.exe} -@item David J. Hughes -For the effort to make a shareware SQL database. At TcX, the predecessor -of MySQL AB, we started with @code{mSQL}, but found that it couldn't -satisfy our purposes so instead we wrote a SQL interface to our -application builder Unireg. @code{mysqladmin} and @code{mysql} client are -programs that were largely influenced by their @code{mSQL} counterparts. -We have put a lot of effort into making the MySQL syntax a superset of -@code{mSQL}. Many of the API's ideas are borrowed from @code{mSQL} to -make it easy to port free @code{mSQL} programs to the MySQL API. -The MySQL software doesn't contain any code from @code{mSQL}. -Two files in the distribution (@file{client/insert_test.c} and -@file{client/select_test.c}) are based on the corresponding (non-copyrighted) -files in the @code{mSQL} distribution, but are modified as examples showing -the changes necessary to convert code from @code{mSQL} to MySQL Server. -(@code{mSQL} is copyrighted David J. Hughes.) -@item Fred Fish -For his excellent C debugging and trace library. Monty has made a number -of smaller improvements to the library (speed and additional options). -@item Richard A. O'Keefe -For his public domain string library. -@item Henry Spencer -For his regex library, used in @code{WHERE column REGEXP regexp}. -@item Free Software Foundation -From whom we got an excellent compiler (@code{gcc}), the @code{libc} library -(from which we have borrowed @file{strto.c} to get some code working in Linux), -and the @code{readline} library (for the @code{mysql} client). -@item Free Software Foundation & The XEmacs development team -For a really great editor/environment used by almost everybody at -MySQL AB/TcX/detron. -@item Patrick Lynch -For helping us acquire @uref{http://www.mysql.com/}. -@item Fred Lindberg -For setting up qmail to handle the MySQL mailing list and for the -incredible help we got in managing the MySQL mailing lists. -@item Igor Romanenko @email{igor@@frog.kiev.ua} -@code{mysqldump} (previously @code{msqldump}, but ported and enhanced by -Monty). -@item Yuri Dario -For keeping up and extending the MySQL OS/2 port. -@item Tim Bunce, Alligator Descartes -For the @code{DBD} (Perl) interface. -@item Tim Bunce -Author of @code{mysqlhotcopy}. -@item Andreas Koenig @email{a.koenig@@mind.de} -For the Perl interface for MySQL Server. -@item Eugene Chan @email{eugene@@acenet.com.sg} -For porting PHP for MySQL Server. -@item Michael J. Miller Jr. @email{mke@@terrapin.turbolift.com} -For the first MySQL manual. And a lot of spelling/language -fixes for the FAQ (that turned into the MySQL manual a long -time ago). -@item Yan Cailin -First translator of the MySQL Reference Manual into simplified -chinese in early 2000 on which the Big5 and HK coded -(@uref{http://mysql.hitstar.com/}) versions were -based. @uref{http://linuxdb.yeah.net, Personal home page at -linuxdb.yeah.net}. -@item Giovanni Maruzzelli @email{maruzz@@matrice.it} -For porting iODBC (Unix ODBC). -@item Chris Provenzano -Portable user level pthreads. From the copyright: This product includes -software developed by Chris Provenzano, the University of California, -Berkeley, and contributors. We are currently using version 1_60_beta6 -patched by Monty (see @file{mit-pthreads/Changes-mysql}). -@item Xavier Leroy @email{Xavier.Leroy@@inria.fr} -The author of LinuxThreads (used by the MySQL Server on Linux). -@item Zarko Mocnik @email{zarko.mocnik@@dem.si} -Sorting for Slovenian language and the @file{cset.tar.gz} module that makes -it easier to add other character sets. -@item "TAMITO" @email{tommy@@valley.ne.jp} -The @code{_MB} character set macros and the ujis and sjis character sets. -@item Joshua Chamas @email{joshua@@chamas.com} -Base for concurrent insert, extended date syntax, debugging on NT, and -answering on the MySQL mailing list. -@item Yves Carlier @email{Yves.Carlier@@rug.ac.be} -@code{mysqlaccess}, a program to show the access rights for a user. -@item Rhys Jones @email{rhys@@wales.com} (And GWE Technologies Limited) -For JDBC, a module to extract data from a MySQL Database with a Java client. -@item Dr Xiaokun Kelvin ZHU @email{X.Zhu@@brad.ac.uk} -Further development of the JDBC driver and other MySQL-related -Java tools. -@item James Cooper @email{pixel@@organic.com} -For setting up a searchable mailing list archive at his site. -@item Rick Mehalick @email{Rick_Mehalick@@i-o.com} -For @code{xmysql}, a graphical X client for MySQL Server. -@item Doug Sisk @email{sisk@@wix.com} -For providing RPM packages of MySQL for RedHat Linux. -@item Diemand Alexander V. @email{axeld@@vial.ethz.ch} -For providing RPM packages of MySQL for RedHat Linux-Alpha. -@item Antoni Pamies Olive @email{toni@@readysoft.es} -For providing RPM versions of a lot of MySQL clients for Intel -and SPARC. -@item Jay Bloodworth @email{jay@@pathways.sde.state.sc.us} -For providing RPM versions for MySQL Version 3.21. -@item Jochen Wiedmann @email{wiedmann@@neckar-alb.de} -For maintaining the Perl @code{DBD::mysql} module. -@item Therrien Gilbert @email{gilbert@@ican.net}, Jean-Marc Pouyot @email{jmp@@scalaire.fr} -French error messages. -@item Petr Snajdr, @email{snajdr@@pvt.net} -Czech error messages. -@item Jaroslaw Lewandowski @email{jotel@@itnet.com.pl} -Polish error messages. -@item Miguel Angel Fernandez Roiz -Spanish error messages. -@item Roy-Magne Mo @email{rmo@@www.hivolda.no} -Norwegian error messages and testing of Version 3.21.#. -@item Timur I. Bakeyev @email{root@@timur.tatarstan.ru} -Russian error messages. -@item @email{brenno@@dewinter.com} & Filippo Grassilli @email{phil@@hyppo.com} -Italian error messages. -@item Dirk Munzinger @email{dirk@@trinity.saar.de} -German error messages. -@item Billik Stefan @email{billik@@sun.uniag.sk} -Slovak error messages. -@item Stefan Saroiu @email{tzoompy@@cs.washington.edu} -Romanian error messages. -@item Peter Feher -Hungarian error messages. -@item Roberto M. Serqueira -Portugise error messages. -@item Carsten H. Pedersen -Danish error messages. -@item Arjen G. Lentz -Dutch error messages, completing earlier partial translation -(also work on consistency and spelling). -@item David Sacerdote @email{davids@@secnet.com} -Ideas for secure checking of DNS hostnames. -@item Wei-Jou Chen @email{jou@@nematic.ieo.nctu.edu.tw} -Some support for Chinese(BIG5) characters. -@item Wei He @email{hewei@@mail.ied.ac.cn} -A lot of functionality for the Chinese(GBK) character set. -@item Zeev Suraski @email{bourbon@@netvision.net.il} -@code{FROM_UNIXTIME()} time formatting, @code{ENCRYPT()} functions, and -@code{bison} advisor. -Active mailing list member. -@item Luuk de Boer @email{luuk@@wxs.nl} -Ported (and extended) the benchmark suite to @code{DBI}/@code{DBD}. Have -been of great help with @code{crash-me} and running benchmarks. Some new -date functions. The @code{mysql_setpermissions} script. -@item Jay Flaherty @email{fty@@mediapulse.com} -Big parts of the Perl @code{DBI}/@code{DBD} section in the manual. -@item Paul Southworth @email{pauls@@etext.org}, Ray Loyzaga @email{yar@@cs.su.oz.au} -Proof-reading of the Reference Manual. -@item Alexis Mikhailov @email{root@@medinf.chuvashia.su} -User-definable functions (UDFs); @code{CREATE FUNCTION} and -@code{DROP FUNCTION}. -@item Andreas F. Bobak @email{bobak@@relog.ch} -The @code{AGGREGATE} extension to UDF functions. -@item Ross Wakelin @email{R.Wakelin@@march.co.uk} -Help to set up InstallShield for MySQL-Win32. -@item Jethro Wright III @email{jetman@@li.net} -The @file{libmysql.dll} library. -@item James Pereria @email{jpereira@@iafrica.com} -Mysqlmanager, a Win32 GUI tool for administrating MySQL Server. -@item Curt Sampson @email{cjs@@portal.ca} -Porting of MIT-pthreads to NetBSD/Alpha and NetBSD 1.3/i386. -@item Antony T. Curtis @email{antony.curtis@@olcs.net} -Porting of the MySQL Database software to OS/2. -@item Martin Ramsch @email{m.ramsch@@computer.org} -Examples in the MySQL Tutorial. -@item Steve Harvey -For making @code{mysqlaccess} more secure. -@item Konark IA-64 Centre of Persistent Systems Private Limited -@uref{http://www.pspl.co.in/konark/}. Help with the Win64 port of the -MySQL server. -@item Albert Chin-A-Young. -Configure updates for Tru64, large file support and better TCP wrappers -support. -@item John Birrell -Emulation of @code{pthread_mutex()} for OS/2. -@item Benjamin Pflugmann -Extended @code{MERGE} tables to handle @code{INSERTS}. Active member -on the MySQL mailing lists. -@item Guilhem Bichot -Fixed handling of exponents for @code{DECIMAL}. -Author of @code{mysql_tableinfo}. -@end table - -Other contributors, bugfinders, and testers: James H. Thompson, Maurizio -Menghini, Wojciech Tryc, Luca Berra, Zarko Mocnik, Wim Bonis, Elmar -Haneke, @email{jehamby@@lightside}, @email{psmith@@BayNetworks.com}, -@email{duane@@connect.com.au}, Ted Deppner @email{ted@@psyber.com}, -Mike Simons, Jaakko Hyvatti. - -And lots of bug report/patches from the folks on the mailing list. - -A big tribute goes to those that help us answer questions on the -@code{mysql@@lists.mysql.com} mailing list: - -@table @asis -@item Daniel Koch @email{dkoch@@amcity.com} -Irix setup. -@item Luuk de Boer @email{luuk@@wxs.nl} -Benchmark questions. -@item Tim Sailer @email{tps@@users.buoy.com} -@code{DBD-mysql} questions. -@item Boyd Lynn Gerber @email{gerberb@@zenez.com} -SCO-related questions. -@item Richard Mehalick @email{RM186061@@shellus.com} -@code{xmysql}-related questions and basic installation questions. -@item Zeev Suraski @email{bourbon@@netvision.net.il} -Apache module configuration questions (log & auth), PHP-related -questions, SQL syntax-related questions and other general questions. -@item Francesc Guasch @email{frankie@@citel.upc.es} -General questions. -@item Jonathan J Smith @email{jsmith@@wtp.net} -Questions pertaining to OS-specifics with Linux, SQL syntax, and other -things that might need some work. -@item David Sklar @email{sklar@@student.net} -Using MySQL from PHP and Perl. -@item Alistair MacDonald @email{A.MacDonald@@uel.ac.uk} -Not yet specified, but is flexible and can handle Linux and maybe HP-UX. -Will try to get user to use @code{mysqlbug}. -@item John Lyon @email{jlyon@@imag.net} -Questions about installing MySQL on Linux systems, using either -@file{.rpm} files or compiling from source. -@item Lorvid Ltd. @email{lorvid@@WOLFENET.com} -Simple billing/license/support/copyright issues. -@item Patrick Sherrill @email{patrick@@coconet.com} -ODBC and VisualC++ interface questions. -@item Randy Harmon @email{rjharmon@@uptimecomputers.com} -@code{DBD}, Linux, some SQL syntax questions. -@end table - - -@node Supporters, , Contributors, Credits -@appendixsec Supporters to MySQL - -@cindex contributing companies, list of - -While @code{MySQL AB} owns all copyrights in the @code{MySQL server} -and the @code{MySQL manual}, we wish to recognise the following companies, -which helped us finance the development of the @code{MySQL server}, -such as by paying us for developing a new feature or giving us hardware -for development of the @code{MySQL server}. - -@table @asis -@item VA Linux / Andover.net -Funded replication. -@item NuSphere -Editing of the MySQL manual. -@item Stork Design studio -The MySQL web site in use between 1998-2000. -@item Intel -Contributed to development on Windows and Linux platforms. -@item Compaq -Contributed to Development on Linux/Alpha. -@item SWSoft -Development on the embedded @code{mysqld} version. -@item FutureQuest -@code{--skip-show-database} -@end table - - -@node News, Porting, Credits, Top -@appendix MySQL Change History - -@cindex ChangeLog -@cindex changes, log -@cindex log, changes - -This appendix lists the changes from version to version in the MySQL -source code. - -We are now working actively on MySQL 4.x and will only provide critical -bug fixes for MySQL 3.23. We update this section as we add new -features, so that everybody can follow the development. - -Our TODO section contains what further plans we have for 4.x. @xref{TODO}. - -Note that we tend to update the manual at the same time we make changes to -MySQL. If you find a version listed here that you can't -find on the MySQL download page (@uref{http://www.mysql.com/downloads/}), -this means that the version has not yet been released! - -@c Please don't add a new version here without also updating ../configure.in! - -@menu -* News-4.1.x:: -* News-4.0.x:: Changes in release 4.0.x (Beta) -* News-3.23.x:: Changes in release 3.23.x (Stable) -* News-3.22.x:: Changes in release 3.22.x (Older; Still supported) -* News-3.21.x:: Changes in release 3.21.x -* News-3.20.x:: Changes in release 3.20.x -* News-3.19.x:: Changes in release 3.19.x -@end menu - - -@node News-4.1.x, News-4.0.x, News, News -@appendixsec Changes in release 4.1.x (Alpha) - -@cindex changes, version 4.1 - -Version 4.1 of the MySQL server includes many enhancements and new features: - -@itemize @bullet -@item -Sub selects: @code{SELECT * from t1 where t1.a=(SELECT t2.b FROM t2)}. -@item -Character sets to be defined per column, table and database. -@item -Unicode (UTF8) support. -@item -Derived tables: @code{SELECT a from t1, (select * from t2) WHERE t1.a=t2.a} -@item -@code{BTREE} index on @code{HEAP} tables. -@item -Support for GIS (Geometrical data). -@item -@code{SHOW WARNINGS}; Shows warnings for the last command. -@end itemize - -For a full list of changes, please refer to the changelog sections for -each individual 4.1.x release. - -@menu -* News-4.1.0:: -@end menu - -@node News-4.1.0, , News-4.1.x, News-4.1.x -@appendixsubsec Changes in release 4.1.0 -@itemize -@item -One can specify many temporary directories to be used in a round-robin -fasion with: @code{--tmpdir=dirname1:dirname2:dirname3}. -@item -Sub selects: @code{SELECT * from t1 where t1.a=(SELECT t2.b FROM t2)}. -@item -Character sets to be defined per column, table and database. -@item -Unicode (UTF8) support. -@item -Derived tables: @code{SELECT a from t1, (select * from t2) WHERE t1.a=t2.a} -@item -@code{BTREE} index on @code{HEAP} tables. -@item -Faster embedded server. -@item -One can add a comment per column in @code{CREATE TABLE}. -@item -@code{SHOW FULL COLUMNS FROM table_name} shows column comments. -@item -@code{ALTER DATABASE}. -@item -Support for GIS (Geometrical data). -@item -@code{SHOW WARNINGS}; Shows warnings from the last command. -@item -One can specify a column type for a colum in @code{CREATE TABLE -... SELECT} by defining the column in the @code{CREATE} part - -@example -CREATE TABLE foo (a tinyint not null) SELECT b+1 AS 'a' FROM bar; -@end example - -@end itemize - - -@node News-4.0.x, News-3.23.x, News-4.1.x, News -@appendixsec Changes in release 4.0.x (Beta) - -@cindex changes, version 4.0 - -Version 4.0 of the MySQL server includes many enhancements and new features: - -@itemize @bullet -@item -The @code{InnoDB} table type is now included in the standard binaries, -adding transactions, row-level locking, and foreign keys. -@xref{InnoDB}. -@item -A query qache, offering vastly increased performance for many applications. -By caching complete result sets, later identical queries can return -instantly. -@xref{Query Cache}. -@item -Improved full-text indexing with boolean mode, truncation, and phrase searching. -@xref{Fulltext Search}. -@item -Enhanced @code{MERGE} tables, now supporting @code{INSERT}s and -@code{AUTO_INCREMENT}. -@xref{MERGE}. -@item -@code{UNION} syntax in @code{SELECT}. -@xref{UNION}. -@item -Multi-table @code{DELETE} statements. -@xref{DELETE}. -@item -@code{libmysqld}, the embedded server library. -@xref{libmysqld}. -@item -Additional @code{GRANT} privilege options for even tighter control and -security. -@xref{GRANT}. -@item -Management of user resources in the @code{GRANT} system, particularly -useful for ISPs and other hosting providers. -@xref{User resources}. -@item -Dynamic server variables, allowing configuration changes without having -to take down the server. -@xref{SET OPTION}. -@item -Improved replication code and features. -@xref{Replication}. -@item -Numerous new functions and options. -@item -Changes to existing code for enhanced performance and reliability. -@end itemize - -For a full list of changes, please refer to the changelog sections for -each individual 4.0.x release. - - -@menu -* News-4.0.5:: Changes in release 4.0.5 -* News-4.0.4:: Changes in release 4.0.4 (29 Sep 2002) -* News-4.0.3:: Changes in release 4.0.3 (26 Aug 2002: Beta) -* News-4.0.2:: Changes in release 4.0.2 (01 Jul 2002) -* News-4.0.1:: Changes in release 4.0.1 (23 Dec 2001) -* News-4.0.0:: Changes in release 4.0.0 (Oct 2001: Alpha) -@end menu - -@node News-4.0.5, News-4.0.4, News-4.0.x, News-4.0.x -@appendixsubsec Changes in release 4.0.5 -@itemize -@item -When one uses the @code{--open-files-limit=#} option to @code{mysqld_safe} -it's now passed on to @code{mysqld} -@item -Fixed that @code{GROUP BY} on columns that may have a @code{NULL} value -doesn't always use disk based temporary tables. -@item -Changed output from @code{EXPLAIN} from @code{'where used'} to -@code{'Using where'} to make it more in line with other output. -@item -Removed variable @code{safe_show_database} as it was not used anymore. -@item -Read @code{--des-key-file} relative to database directory. -@item -Small code improvement in multi-table updates -@item -Fixed a newly introduced bug that caused @code{ORDER BY ... LIMIT #} -to not return all rows. -@item -Fixed a bug in multi-table deletes when outer join is used on an empty -table, which get's first to be deleted -@item -Fixed a bug in multi-table updates when a single table is updated -@item -Updated source tree to be built using @code{automake 1.5} and -@code{libtool 1.4}. -@item -Fixed bug that made @code{REPAIR TABLE} and @code{myisamchk} -to corrupt @code{FULLTEXT} indexes. -@item -Fixed bug with caching system database ('mysql'). Now query to system -database is not cached by query cache. -@item -Small fix in @code{mysqld_safe} for some shells. -@item -Give error if a @code{MyISAM} @code{MERGE} table has more than 2 ^ 32 rows and -MySQL was not compiled with with @code{-DBIG_TABLES}. -@item -Fixed some @code{ORDER BY ... DESC} problems with InnoDB. -@item -Fixed an inadvertently changed option (@code{--ignore-space}) back to the -original @code{--ignore-spaces} in @code{mysqlclient}. (Both syntaxes will -work). -@item -Don't require @code{UPDATE} privilege when using @code{REPLACE}. -@item -Allow braces in joins in all positions. Formerly, things like -@code{SELECT * FROM (t2 LEFT JOIN t3 USING (a)), t1} worked, but -not @code{SELECT * FROM t1, (t2 LEFT JOIN t3 USING (a))}. Note that -braces are simply removed, they do not change the way the join is -executed. -@end itemize - -@node News-4.0.4, News-4.0.3, News-4.0.5, News-4.0.x -@appendixsubsec Changes in release 4.0.4 (29 Sep 2002) - -@itemize @bullet -@item -Fixed bug where @code{GRANT}/@code{REVOKE} failed if hostname was given in -not matching case. -@item -Don't give warning in @code{LOAD DATA INFILE} when setting a -@code{timestamp} to a string value of @code{'0'}. -@item -Fixed bug in @code{myisamchk -R} mode. -@item -Fixed bug that caused @code{mysqld} to crash on @code{REVOKE}. -@item -Fixed bug in @code{ORDER BY} when there is a constant in the @code{SELECT} -statement. -@item -One didn't get an error message if @code{mysqld} couldn't open the -privilege tables. -@item -@code{SET PASSWORD FOR ...} closed the connection in case of errors (bug -from 4.0.3). -@item -Increased max possible @code{max_allowed_packet} in @code{mysqld} to 1GB. -@item -Fixed bug when doing a multi-line @code{INSERT} on a table with an -@code{auto_increment} key which was not in the first part of the key. -@item -Changed @code{LOAD DATA INFILE} to not recreate index if the table had -rows from before. -@item -Fixed overrun bug when calling @code{AES_DECRYPT()} with wrong arguments. -@item -@code{--skip-ssl} can now be used to disable SSL in the MySQL clients, -even if one is using other SSL options in an options file or previously -on the command line. -@item -Fixed bug in @code{MATCH ... AGAINST( ... IN BOOLEAN MODE)} -used with @code{ORDER BY}. -@item -Added @code{LOCK TABLES} and @code{CREATE TEMPORARY TABLES} privilege on -the database level. One must run the @code{mysql_fix_privilege_tables} -script on old installations to activate these. -@item -In @code{SHOW TABLE ... STATUS} compressed tables sometimes showed up as -@code{dynamic}. -@item -@code{SELECT @@@@[global|session].var_name} didn't report -@code{global | session} in the result column name. -@item -Fixed problem in replication that @code{FLUSH LOGS} in a circular -replication setup created an infinite number of binary log files. -Now a @code{rotate-binary-log} command in the binary log will not cause slaves -to rotate logs. -@item -Removed @code{STOP EVENT} from binary log when doing @code{FLUSH LOGS}. -@item -Disable the use of @code{SHOW NEW MASTER FOR SLAVE} as this needs to be -completely changed in 4.1. -@item -Fixed a bug with constant expression (e.g. field of a one-row table, or field -from a table, referenced by a @code{UNIQUE} key) appeared in @code{ORDER BY} -part of @code{SELECT DISTINCT}. -@item -@code{--log-binary=a.b.c} now properly strips off @code{.b.c}. -@item -@code{FLUSH LOGS} removed numerical extension for all future update logs. -@item -@code{GRANT ... REQUIRE} didn't store the SSL information in the -@code{mysql.user} table if SSL was not enabled in the server. -@item -@code{GRANT ... REQUIRE NONE} can now be used to remove SSL information. -@item -@code{AND} is now optional between @code{REQUIRE} options. -@item -@code{REQUIRE} option was not properly saved, which could cause strange -output in @code{SHOW GRANTS}. -@item -Fixed that @code{mysqld --help} reports correct values for @code{--datadir} -and @code{--bind-address}. -@item -Fixed that one can drop UDFs that didn't exist when @code{mysqld} was started. -@item -Fixed core dump problem with @code{SHOW VARIABLES} on some 64 bit systems -(like Solaris sparc). -@item -Fixed a bug in my_getopt; @code{--set-variable} syntax didn't work for -those options that didn't have a valid variable in my_option struct. -This affected at least @code{default-table-type} option. -@item -Fixed a bug from 4.0.2 that caused @code{REPAIR TABLE} and -@code{myisamchk --repair} to fail on tables with duplicates in a unique -key. -@item -Fixed a bug from 4.0.3 in calculating the default field type for some -functions. This affected queries of type @code{CREATE TABLE table_name -SELECT expression(),...} -@item -Fixed bug in queries of type -@code{SELECT * FROM table-list GROUP BY ...} and -@code{SELECT DISTINCT * FROM ...}. -@item -Fixed bug with the @code{--slow-log} when logging an administrator command -(like @code{FLUSH TABLES}). -@item -Fixed a bug that @code{OPTIMIZE} of locked and modified table, -reported table corruption. -@item -Fixed a bug in my_getopt in handling of special prefixes (@code{--skip-}, -@code{--enable-}). @code{--skip-external-locking} didn't work and the bug -may have affected other similar options. -@item -Fixed bug in checking for output file name of the @code{tee} option. -@item -Added some more optimisation to use index for -@code{SELECT ... FROM many_tables .. ORDER BY key limit #} -@item -Fixed problem in @code{SHOW OPEN TABLES} when a user didn't have access -permissions to one of the opened tables. -@end itemize - -@node News-4.0.3, News-4.0.2, News-4.0.4, News-4.0.x -@appendixsubsec Changes in release 4.0.3 (26 Aug 2002: Beta) - -@itemize @bullet -@item -Fixed problem with @code{configure ... --localstatedir=...}. -@item -Cleaned up @code{mysql.server} script. -@item -Fixed a bug in @code{mysqladmin shutdown} when pid file was modified -while @code{mysqladmin} was still waiting for the previous one to -disappear. This could happen during a very quick restart and caused -@code{mysqladmin} to hang until @code{shutdown_timeout} seconds had -passed. -@item -Don't increment warnings when setting @code{AUTO_INCREMENT} columns to -@code{NULL} in @code{LOAD DATA INFILE}. -@item -Fixed all boolean type variables/options to work with the old syntax, -e.g. all of these work: --lower-case-table-names, --lower-case-table-names=1, --O lower-case-table-names=1, --set-variable=lower-case-table-names=1 -@item -Fixed shutdown problem (SIGTERM signal handling) on Solaris. (Bug from 4.0.2). -@item -@code{SHOW MASTER STATUS} now returns an empty set if binary log is not -enabled. -@item -@code{SHOW SLAVE STATUS} now returns an empty set if slave is not initialised. -@item -Don't update MyISAM index file on update if not strictly necessary. -@item -Fixed bug in @code{SELECT DISTINCT ... FROM many_tables ORDER BY -not-used-column}. -@item -Fixed a bug with @code{BIGINT}s and quoted strings. -@item -Added @code{QUOTE()} function that performs SQL quoting to produce values -that can be used as data values in queries. -@item -Changed variable @code{DELAY_KEY_WRITE} to an enum to allow one set -@code{DELAY_KEY_WRITE} for all tables without taking down the server. -@item -Changed behaviour of @code{IF(condition,column,NULL)} so that it returns -the value of the column type. -@item -Made @code{safe_mysqld} a symlink to @code{mysqld_safe} in binary distribution. -@item -Fixed security bug when having an empty database name in the @code{user.db} -table. -@item -Fixed some problems with @code{CREATE TABLE ... SELECT function()}. -@item -@code{mysqld} now has the option @code{--temp-pool} enabled by default as this -gives better performance with some operating systems. -@item -Fixed hang in @code{CHANGE MASTER TO} if the slave thread died very quickly. -@item -Big cleanup in replication code (less logging, better error messages, etc..) -@item -If the @code{--code-file} option is specified, the server calls -@code{setrlimit()} to set the maximum allowed core file size to unlimited, -so core files can be generated. -@item -Fixed bug in query cache after temporary table creation. -@item -Added @code{--count=N} (@code{-c}) option to @code{mysqladmin}, to make the -program do only @code{N} iterations. To be used with @code{--sleep} (@code{-i}). -Useful in scripts. -@item -Fixed bug in multi-table @code{UPDATE}: when updating a table, -@code{do_select()} became confused about reading records from a cache. -@item -Fixed bug in multi-table @code{UPDATE} when several fields were referenced -from a single table -@item -Fixed bug in truncating nonexisting table. -@item -Fixed bug in @code{REVOKE} that caused user resources to be randomly set. -@item -Fixed bug in @code{GRANT} for the new @code{CREATE TEMPORARY TABLE} privilege. -@item -Fixed bug in multi-table @code{DELETE} when tables are re-ordered in the -table initialisation method and ref_lengths are of different sizes. -@item -Fixed two bugs in @code{SELECT DISTINCT} with large tables. -@item -Fixed bug in query cache initialisation with very small query cache size. -@item -Allow @code{DEFAULT} with @code{INSERT} statement. -@item -The startup parameters @code{myisam_max_sort_file_size} and -@code{myisam_max_extra_sort_file_size} are now given in bytes, not megabytes. -@item -External system locking of @code{MyISAM}/@code{ISAM} files is now turned -off by default. One can turn this on with @code{--external-locking}. -(For most users this is never needed). -@item -Fixed core dump bug with @code{INSERT ... SET db_name.table_name.colname=''}. -@item -Fixed client hangup bug when using some SQL commands with wrong syntax. -@item -Fixed a timing bug in @code{DROP DATABASE} -@item -New @code{SET [GLOBAL | SESSION]} syntax to change thread-specific and global -server variables at runtime. -@item -Added variable @code{slave_compressed_protocol}. -@item -Renamed variable @code{query_cache_startup_type} to @code{query_cache_type}, -@code{myisam_bulk_insert_tree_size} to @code{bulk_insert_buffer_size}, -@code{record_buffer} to @code{read_buffer_size} and -@code{record_rnd_buffer} to @code{record_rnd_buffer_size}. -@item -Renamed some SQL variables, but old names will still work until 5.0. -@xref{Upgrading-from-3.23}. -@item -Renamed @code{--skip-locking} to @code{--skip-external-locking}. -@item -Removed unused variable @code{query_buffer_size}. -@item -Fixed a bug that made the pager option in the @code{mysql} client -non-functional. -@item -Added full @code{AUTO_INCREMENT} support to @code{MERGE} tables. -@item -Extended @code{LOG()} function to accept an optional arbitrary base -parameter. -@xref{Mathematical functions}. -@item -Added @code{LOG2()} function (useful for finding out how many bits -a number would require for storage). -@item -Added @code{LN()} natural logarithm function for compatibility with -other databases. It is synonymous with @code{LOG(X)}. -@end itemize - - -@node News-4.0.2, News-4.0.1, News-4.0.3, News-4.0.x -@appendixsubsec Changes in release 4.0.2 (01 Jul 2002) - -@itemize @bullet -@item -Cleaned up @code{NULL} handling for default values in @code{DESCRIBE -table_name}. -@item -Fixed @code{truncate()} to round up negative values to the nearest integer. -@item -Changed @code{--chroot=path} option to execute @code{chroot()} immediately -after all options have been parsed. -@item -Don't allow database names that contain @samp{\}. -@item -@code{lower_case_table_names} now also affects database names. -@item -Added @code{XOR} operator (logical and bitwise @code{XOR}) with @code{^} -as a synonym for bitwise @code{XOR}. -@item -Added function @code{IS_FREE_LOCK("lock_name")}. -Based on code contributed by Hartmut Holzgraefe @email{hartmut@@six.de}. -@item -Removed @code{mysql_ssl_clear()} from C API, as it was not needed. -@item -@code{DECIMAL} and @code{NUMERIC} types can now read exponential numbers. -@item -Added @code{SHA1()} function to calculate 160 bit hash value as described -in RFC 3174 (Secure Hash Algorithm). This function can be considered a -cryptographically more secure equivalent of @code{MD5()}. -@xref{Miscellaneous functions}. -@item -Added @code{AES_ENCRYPT()} and @code{AES_DECRYPT()} functions to perform -encryption according to AES standard (Rijndael). -@xref{Miscellaneous functions}. -@item -Added @code{--single-transaction} option to @code{mysqldump}, allowing a -consistent dump of @code{InnoDB} tables. -@xref{mysqldump}. -@item -Fixed bug in @code{innodb_log_group_home_dir} in @code{SHOW VARIABLES}. -@item -Fixed a bug in optimiser with merge tables when non-unique values are -used in summing up (causing crashes). -@item -Fixed a bug in optimiser when a range specified makes index grouping -impossible (causing crashes). -@item -Fixed a rare bug when @code{FULLTEXT} index is present and no tables are used. -@item -Added privileges @code{CREATE TEMPORARY TABLES}, @code{EXECUTE}, -@code{LOCK TABLES}, @code{REPLICATION CLIENT}, @code{REPLICATION SLAVE}, -@code{SHOW DATABASES} and @code{SUPER}. To use these, you must have -run the @code{mysql_fix_privilege_tables} script after upgrading. -@item -Fixed query cache align data bug. -@item -Fixed mutex bug in replication when reading from master fails. -@item -Added missing mutex in @code{TRUNCATE TABLE}; This fixes some core -dump/hangup problems when using @code{TRUNCATE TABLE}. -@item -Fixed bug in multi-table @code{DELETE} when optimiser uses only indices. -@item -Fixed that @code{ALTER TABLE table_name RENAME new_table_name} is as fast -as @code{RENAME TABLE}. -@item -Fixed bug in @code{GROUP BY} with two or more fields, where at least one -field can contain @code{NULL} values. -@item -Use @code{Turbo Boyer-Moore} algorithm to speed up @code{LIKE "%keyword%"} -searches. -@item -Fixed bug in @code{DROP DATABASE} with symlink. -@item -Fixed crash in @code{REPAIR ... USE_FRM}. -@item -Fixed bug in @code{EXPLAIN} with @code{LIMIT offset != 0}. -@item -Fixed bug in phrase operator @code{"..."} in boolean full-text search. -@item -Fixed bug that caused duplicated rows when using truncation operator -@code{*} in boolean full-text search. -@item -Fixed bug in truncation operator of boolean full-text search (wrong results -when there are only @code{+word*}s in the query). -@item -Fixed bug in boolean full-text search that caused a crash when an identical -@code{MATCH} expression that did not use an index appeared twice. -@item -Query cache is now automatically disabled in @code{mysqldump}. -@item -Fixed problem on Windows 98 that made sending of results very slow. -@item -Boolean full-text search weighting scheme changed to something more reasonable. -@item -Fixed bug in boolean full-text search that caused MySQL to ignore queries of -@code{ft_min_word_len} characters. -@item -Boolean full-text search now supports ``phrase searches''. -@item -New configure option @code{--without-query-cache}. -@item -Memory allocation strategy for ``root memory'' changed. Block size now grows -with number of allocated blocks. -@item -@code{INET_NTOA()} now returns @code{NULL} if you give it an argument that -is too large (greater than the value corresponding to @code{255.255.255.255}). -@item -Fix @code{SQL_CALC_FOUND_ROWS} to work with @code{UNION}s. It will work only -if the first @code{SELECT} has this option and if there is global @code{LIMIT} -for the entire statement. For the moment, this requires using parentheses for -individual @code{SELECT} queries within the statement. -@item -Fixed bug in @code{SQL_CALC_FOUND_ROWS} and @code{LIMIT}. -@item -Don't give an error for @code{CREATE TABLE ...(... VARCHAR(0))}. -@item -Fixed @code{SIGINT} and @code{SIGQUIT} problems in @file{mysql.cc} on Linux -with some @code{glibc} versions. -@item -Fixed bug in @file{convert.cc}, which is caused by having an incorrect -@code{net_store_length()} linked in the @code{CONVERT::store()} method. -@item -@code{DOUBLE} and @code{FLOAT} columns now honor the @code{UNSIGNED} flag -on storage. -@item -@code{InnoDB} now retains foreign key constraints through @code{ALTER TABLE} -and @code{CREATE/DROP INDEX}. -@item -@code{InnoDB} now allows foreign key constraints to be added through the -@code{ALTER TABLE} syntax. -@item -@code{InnoDB} tables can now be set to automatically grow in size (autoextend). -@item -Added @code{--ignore-lines=n} option to @code{mysqlimport}. This has the -same effect as the @code{IGNORE n LINES} clause for @code{LOAD DATA}. -@item -Fixed bug in @code{UNION} with last offset being transposed to total result -set. -@item -@code{REPAIR ... USE_FRM} added. -@item -Fixed that @code{DEFAULT_SELECT_LIMIT} is always imposed on @code{UNION} -result set. -@item -Fixed that some @code{SELECT} options can appear only in the first -@code{SELECT}. -@item -Fixed bug with @code{LIMIT} with @code{UNION}, where last select is in -the braces. -@item -Fixed that full-text works fine with @code{UNION} operations. -@item -Fixed bug with indexless boolean full-text search. -@item -Fixed bug that sometimes appeared when full-text search was used -with ``const'' tables. -@item -Fixed incorrect error value when doing a @code{SELECT} with an empty -@code{HEAP} table. -@item -Use @code{ORDER BY column DESC} now sorts @code{NULL} values first. -(In other words, @code{NULL} values sort first in all cases, whether or -not @code{DESC} is specified.) -@item -Fixed bug in @code{WHERE key_name='constant' ORDER BY key_name DESC}. -@item -Fixed bug in @code{SELECT DISTINCT ... ORDER BY DESC} optimisation. -@item -Fixed bug in @code{... HAVING 'GROUP_FUNCTION'(xxx) IS [NOT] NULL}. -@item -Fixed bug in truncation operator for boolean full-text search. -@item -Allow value of @code{--user=#} option for @code{mysqld} to be specified -as a numeric user ID. -@item -Fixed a bug where @code{SQL_CALC_ROWS} returned an incorrect value when used -with one table and @code{ORDER BY} and with @code{InnoDB} tables. -@item -Fixed that @code{SELECT 0 LIMIT 0} doesn't hang thread. -@item -Fixed some problems with @code{USE/IGNORE INDEX} when using -many keys with the same start column. -@item -Don't use table scan with @code{BerkeleyDB} and @code{InnoDB} tables when -we can use an index that covers the whole row. -@item -Optimised @code{InnoDB} sort-buffer handling to take less memory. -@item -Fixed bug in multi-table @code{DELETE} and @code{InnoDB} tables. -@item -Fixed problem with @code{TRUNCATE} and @code{InnoDB} tables that produced the -error @code{Can't execute the given command because you have active locked -tables or an active transaction}. -@item -Added @code{NO_UNSIGNED_SUBTRACTION} to the set of flags that may be -specified with the @code{--sql-mode} option for @code{mysqld}. It disables -unsigned arithmetic rules when it comes to subtraction. (This will make -MySQL 4.0 behave more closely to 3.23 with @code{UNSIGNED} columns). -@item -The result returned for all bit functions (@code{|}, @code{<<}, ...) is now of -type @code{unsigned integer}. -@item -Added detection of @code{nan} values in @code{MyISAM} to make it possible to -repair tables with @code{nan} in float or double columns. -@item -Fixed new bug in @code{myisamchk} where it didn't correctly update number of -``parts'' in the @code{MyISAM} index file. -@item -Changed to use @code{autoconf} 2.52 (from @code{autoconf} 2.13). -@item -Fixed optimisation problem where the MySQL Server was in ``preparing'' state -for a long time when selecting from an empty table which had contained -a lot of rows. -@item -Fixed bug in complicated join with @code{const} tables. This fix also -improves performance a bit when referring to another table from a -@code{const} table. -@item -First pre-version of multi-table @code{UPDATE} statement. -@item -Fixed bug in multi-table @code{DELETE}. -@item -Fixed bug in @code{SELECT CONCAT(argument_list) ... GROUP BY 1}. -@item -@code{INSERT ... SELECT} did a full rollback in case of an error. Fixed -so that we only roll back the last statement in the current transaction. -@item -Fixed bug with empty expression for boolean full-text search. -@item -Fixed core dump bug in updating full-text key from/to @code{NULL}. -@item -ODBC compatibility: Added @code{BIT_LENGTH()} function. -@item -Fixed core dump bug in @code{GROUP BY BINARY column}. -@item -Added support for @code{NULL} keys in @code{HEAP} tables. -@item -Use index for @code{ORDER BY} in queries of type: -@code{SELECT * FROM t WHERE key_part1=1 ORDER BY key_part1 DESC,key_part2 DESC} -@item -Fixed bug in @code{FLUSH QUERY CACHE}. -@item -Added @code{CAST()} and @code{CONVERT()} functions. The @code{CAST} and -@code{CONVERT} functions are nearly identical and mainly useful when you -want to create a column with a specific type in a @code{CREATE ... SELECT} -statement. For more information, read @ref{Cast Functions}. -@item -@code{CREATE ... SELECT} on @code{DATE} and @code{TIME} functions now -create columns of the expected type. -@item -Changed order in which keys are created in tables. -@item -Added new columns @code{Null} and @code{Index_type} to @code{SHOW INDEX} -output. -@item -Added @code{--no-beep} and @code{--prompt} options to @code{mysql} command-line client. -@item -New feature: management of user resources. -@example -GRANT ... WITH MAX_QUERIES_PER_HOUR N1 - MAX_UPDATES_PER_HOUR N2 - MAX_CONNECTIONS_PER_HOUR N3; -@end example -@xref{User resources}. - -@item -Added @code{mysql_secure_installation} to the @file{scripts/} directory. -@end itemize - - -@node News-4.0.1, News-4.0.0, News-4.0.2, News-4.0.x -@appendixsubsec Changes in release 4.0.1 (23 Dec 2001) - -@itemize @bullet -@item -Fixed bug when @code{HANDLER} was used with some unsupported table type. -@item -@code{mysqldump} now puts @code{ALTER TABLE tbl_name DISABLE KEYS} and -@code{ALTER TABLE tbl_name ENABLE KEYS} in the sql dump. -@item -Added @code{mysql_fix_extensions} script. -@item -Fixed stack overrun problem with @code{LOAD DATA FROM MASTER} on OSF/1. -@item -Fixed shutdown problem on HP-UX. -@item -Added @code{DES_ENCRYPT()} and @code{DES_DECRYPT()} functions. -@item -Added @code{FLUSH DES_KEY_FILE} statement. -@item -Added @code{--des-key-file} option to @code{mysqld}. -@item -@code{HEX(string)} now returns the characters in @code{string} converted to -hexadecimal. -@item -Fixed problem with @code{GRANT} when using @code{lower_case_table_names=1}. -@item -Changed @code{SELECT ... IN SHARE MODE} to -@code{SELECT ... LOCK IN SHARE MODE} (as in MySQL 3.23). -@item -A new query cache to cache results from identical @code{SELECT} queries. -@item -Fixed core dump bug on 64-bit machines when it got an incorrect communication -packet. -@item -@code{MATCH ... AGAINST(... IN BOOLEAN MODE)} can now work -without @code{FULLTEXT} index. -@item -Fixed slave to replicate from 3.23 master. -@item -Miscellaneous replication fixes/cleanup. -@item -Got shutdown to work on Mac OS X. -@item -Added @file{myisam/ft_dump} utility for low-level inspection -of @code{FULLTEXT} indexes. -@item -Fixed bug in @code{DELETE ... WHERE ... MATCH ...}. -@item -Added support for @code{MATCH ... AGAINST(... IN BOOLEAN MODE)}. -@strong{Note: you must rebuild your tables with -@code{ALTER TABLE tablename TYPE=MyISAM} to be -able to use boolean full-text search}. -@item -@code{LOCATE()} and @code{INSTR()} are now case-sensitive if either -argument is a binary string. -@item -Changed @code{RAND()} initialisation so that @code{RAND(N)} and -@code{RAND(N+1)} are more distinct. -@item -Fixed core dump bug in @code{UPDATE ... ORDER BY}. -@item -Changed @code{INSERT INTO ... SELECT} to stop on errors by default. -@item -Ignore @code{DATA DIRECTORY} and @code{INDEX DIRECTORY} directives on Windows. -@item -Added boolean full-text search code. It should be considered early alpha. -@item -Extended @code{MODIFY} and @code{CHANGE} in @code{ALTER TABLE} to accept -the @code{FIRST} and @code{AFTER} keywords. -@item -Indexes are now used with @code{ORDER BY} on a whole @code{InnoDB} table. -@end itemize - - -@node News-4.0.0, , News-4.0.1, News-4.0.x -@appendixsubsec Changes in release 4.0.0 (Oct 2001: Alpha) - -@itemize @bullet -@item -Added @code{--xml} option to @code{mysql} for producing XML output. -@item -Added full-text variables @code{ft_min_word_len}, @code{ft_max_word_len}, and -@code{ft_max_word_len_for_sort}. -@item -Added documentation for @code{libmysqld}, the embedded MySQL server -library. Also added example programs (a @code{mysql} client and -@code{mysqltest} test program) which use @code{libmysqld}. -@item -Removed all Gemini hooks from MySQL server. -@item -Removed @code{my_thread_init()} and @code{my_thread_end()} -from @file{mysql_com.h}, and added @code{mysql_thread_init()} and -@code{mysql_thread_end()} to @file{mysql.h}. -@item -Support for communication packets > 16M. In 4.0.1 we will extend -@code{MyISAM} to be able to handle these. -@item -Secure connections (with SSL). -@item -Unsigned @code{BIGINT} constants now work. @code{MIN()} and @code{MAX()} -now handle signed and unsigned @code{BIGINT} numbers correctly. -@item -New character set @code{latin1_de} which provides correct German sorting. -@item -@code{STRCMP()} now uses the current character set when doing comparisons, -which means that the default comparison behaviour now is case-insensitive. -@item -@code{TRUNCATE TABLE} and @code{DELETE FROM tbl_name} are now separate -functions. One bonus is that @code{DELETE FROM tbl_name} now returns -the number of deleted rows, rather than zero. -@item -@code{DROP DATABASE} now executes a @code{DROP TABLE} on all tables in -the database, which fixes a problem with @code{InnoDB} tables. -@item -Added support for @code{UNION}. -@item -Added support for multi-table @code{DELETE} operations. -@item -A new @code{HANDLER} interface to @code{MyISAM} tables. -@item -Added support for @code{INSERT} on @code{MERGE} tables. Patch from -Benjamin Pflugmann. -@item -Changed @code{WEEK(#,0)} to match the calendar in the USA. -@item -@code{COUNT(DISTINCT)} is about 30% faster. -@item -Speed up all internal list handling. -@item -Speed up @code{IS NULL}, @code{ISNULL()} and some other internal primitives. -@item -Full-text index creation now is much faster. -@item -Tree-like cache to speed up bulk inserts and -@code{myisam_bulk_insert_tree_size} variable. -@item -Searching on packed (@code{CHAR}/@code{VARCHAR}) keys is now much faster. -@item -Optimised queries of type: -@code{SELECT DISTINCT * from tbl_name ORDER by key_part1 LIMIT #}. -@item -@code{SHOW CREATE TABLE} now shows all table attributes. -@item -@code{ORDER BY ... DESC} can now use keys. -@item -@code{LOAD DATA FROM MASTER} ``auto-magically'' sets up a slave. -@item -Renamed @code{safe_mysqld} to @code{mysqld_safe} to make this name more -in line with other MySQL scripts/commands. -@item -Added support for symbolic links to @code{MyISAM} tables. Symlink handling is -now enabled by default for Windows. -@item -Added @code{SQL_CALC_FOUND_ROWS} and @code{FOUND_ROWS()}. This makes it -possible to know how many rows a query would have returned -without a @code{LIMIT} clause. -@item -Changed output format of @code{SHOW OPEN TABLES}. -@item -Allow @code{SELECT expression LIMIT ...}. -@item -Added @code{IDENTITY} as a synonym for @code{AUTO_INCREMENT} (like Sybase). -@item -Added @code{ORDER BY} syntax to @code{UPDATE} and @code{DELETE}. -@item -@code{SHOW INDEXES} is now a synonym for @code{SHOW INDEX}. -@item -Added @code{ALTER TABLE tbl_name DISABLE KEYS} and -@code{ALTER TABLE tbl_name ENABLE KEYS} commands. -@item -Allow use of @code{IN} as a synonym for @code{FROM} in @code{SHOW} commands. -@item -Implemented ``repair by sort'' for @code{FULLTEXT} indexes. -@code{REPAIR TABLE}, @code{ALTER TABLE}, and @code{OPTIMIZE TABLE} -for tables with @code{FULLTEXT} indexes are now up to 100 times faster. -@item -Allow ANSI SQL syntax @code{X'hexadecimal-number'}. -@item -Cleaned up global lock handling for @code{FLUSH TABLES WITH READ LOCK}. -@item -Fixed problem with @code{DATETIME = constant} in @code{WHERE} optimisation. -@item -Added @code{--master-data} and @code{--no-autocommit} options to -@code{mysqldump}. (Thanks to Brian Aker for this.) -@item -Added script @code{mysql_explain_log.sh} to distribution. -(Thanks to mobile.de). -@end itemize - - -@node News-3.23.x, News-3.22.x, News-4.0.x, News -@appendixsec Changes in release 3.23.x (Stable) - -@cindex changes, version 3.23 - -The 3.23 release has several major features that are not -present in previous versions. We have added three new -table types: - -@table @asis -@item @code{MyISAM} -A new ISAM library which is tuned for SQL and supports large files. -@item @code{InnoDB} -A transaction-safe table handler that supports row level locking, and many -Oracle-like features. -@item @code{BerkeleyDB} or @code{BDB} -Uses the Berkeley DB library from Sleepycat Software to implement -transaction-safe tables. -@end table - -Note that only @code{MyISAM} is available in the standard binary distribution. - -The 3.23 release also includes support for database replication between -a master and many slaves, full-text indexing, and much more. - -All new features are being developed in the 4.x version. Only -bug fixes and minor enhancements to existing features will be -added to 3.23. - -The replication code and BerkeleyDB code is still not as tested and as -the rest of the code, so we will probably need to do a couple of future -releases of 3.23 with small fixes for this part of the code. As long as -you don't use these features, you should be quite safe with -MySQL 3.23! - -Note that the above doesn't mean that replication or Berkeley DB don't -work. We have done a lot of testing of all code, including replication -and @code{BDB} without finding any problems. It only means that not as many -users use this code as the rest of the code and because of this we are -not yet 100% confident in this code. - -@menu -* News-3.23.54:: Changes in release 3.23.54 -* News-3.23.53:: Changes in release 3.23.53 -* News-3.23.52:: Changes in release 3.23.52 (14 Aug 2002) -* News-3.23.51:: Changes in release 3.23.51 (31 May 2002) -* News-3.23.50:: Changes in release 3.23.50 (21 Apr 2002) -* News-3.23.49:: Changes in release 3.23.49 -* News-3.23.48:: Changes in release 3.23.48 (07 Feb 2002) -* News-3.23.47:: Changes in release 3.23.47 (27 Dec 2001) -* News-3.23.46:: Changes in release 3.23.46 (29 Nov 2001) -* News-3.23.45:: Changes in release 3.23.45 (22 Nov 2001) -* News-3.23.44:: Changes in release 3.23.44 (31 Oct 2001) -* News-3.23.43:: Changes in release 3.23.43 (04 Oct 2001) -* News-3.23.42:: Changes in release 3.23.42 (08 Sep 2001) -* News-3.23.41:: Changes in release 3.23.41 (11 Aug 2001) -* News-3.23.40:: Changes in release 3.23.40 -* News-3.23.39:: Changes in release 3.23.39 (12 Jun 2001) -* News-3.23.38:: Changes in release 3.23.38 (09 May 2001) -* News-3.23.37:: Changes in release 3.23.37 (17 Apr 2001) -* News-3.23.36:: Changes in release 3.23.36 (27 Mar 2001) -* News-3.23.35:: Changes in release 3.23.35 (15 Mar 2001) -* News-3.23.34a:: Changes in release 3.23.34a -* News-3.23.34:: Changes in release 3.23.34 (10 Mar 2001) -* News-3.23.33:: Changes in release 3.23.33 (09 Feb 2001) -* News-3.23.32:: Changes in release 3.23.32 (22 Jan 2001: Stable) -* News-3.23.31:: Changes in release 3.23.31 (17 Jan 2001) -* News-3.23.30:: Changes in release 3.23.30 (04 Jan 2001) -* News-3.23.29:: Changes in release 3.23.29 (16 Dec 2000) -* News-3.23.28:: Changes in release 3.23.28 (22 Nov 2000: Gamma) -* News-3.23.27:: Changes in release 3.23.27 (24 Oct 2000) -* News-3.23.26:: Changes in release 3.23.26 (18 Oct 2000) -* News-3.23.25:: Changes in release 3.23.25 (29 Sep 2000) -* News-3.23.24:: Changes in release 3.23.24 (08 Sep 2000) -* News-3.23.23:: Changes in release 3.23.23 (01 Sep 2000) -* News-3.23.22:: Changes in release 3.23.22 (31 Jul 2000) -* News-3.23.21:: Changes in release 3.23.21 -* News-3.23.20:: Changes in release 3.23.20 -* News-3.23.19:: Changes in release 3.23.19 -* News-3.23.18:: Changes in release 3.23.18 -* News-3.23.17:: Changes in release 3.23.17 -* News-3.23.16:: Changes in release 3.23.16 -* News-3.23.15:: Changes in release 3.23.15 (May 2000: Beta) -* News-3.23.14:: Changes in release 3.23.14 -* News-3.23.13:: Changes in release 3.23.13 -* News-3.23.12:: Changes in release 3.23.12 (07 Mar 2000) -* News-3.23.11:: Changes in release 3.23.11 -* News-3.23.10:: Changes in release 3.23.10 -* News-3.23.9:: Changes in release 3.23.9 -* News-3.23.8:: Changes in release 3.23.8 (02 Jan 2000) -* News-3.23.7:: Changes in release 3.23.7 (10 Dec 1999) -* News-3.23.6:: Changes in release 3.23.6 -* News-3.23.5:: Changes in release 3.23.5 (20 Oct 1999) -* News-3.23.4:: Changes in release 3.23.4 (28 Sep 1999) -* News-3.23.3:: Changes in release 3.23.3 -* News-3.23.2:: Changes in release 3.23.2 (09 Aug 1999) -* News-3.23.1:: Changes in release 3.23.1 -* News-3.23.0:: Changes in release 3.23.0 (05 Aug 1999: Alpha) -@end menu - -@node News-3.23.54, News-3.23.53, News-3.23.x, News-3.23.x -@appendixsubsec Changes in release 3.23.54 -@itemize -@item -Allow one to start multiple MySQL servers on windows (code backported -from 4.0.2). -@item -Fixed that @code{--core-file} works on Linux (at least on kernel 2.4.18). -@item -Fixed a problem with BDB and @code{ALTER TABLE}. -@item -Fixed reference to freed memory when doing complicated @code{GROUP BY -... ORDER BY} queries. Symptom was that @code{mysqld} died in function -@code{send_fields}. -@item -Allocate heap rows in smaller blocks to get better memory usage. -@item -Fixed memory allocation bug when storing BLOB values in internal -temporary tables used for some (unlikely) @code{GROUP BY} queries. -@item -Fixed a bug in key optimizing handling where the expression -@code{WHERE column_name = key_column_name} was calculated as true -for @code{NULL} values. -@item -Fixed core dump bug when doing @code{LEFT JOIN ... WHERE key_column=NULL}. -@end itemize - -@node News-3.23.53, News-3.23.52, News-3.23.54, News-3.23.x -@appendixsubsec Changes in release 3.23.53 -@itemize @bullet -@item -Fixed crash when @code{SHOW INNODB STATUS} was used and @code{skip-innodb} -was defined. -@item -Fixed possible memory corruption bug in binary log file handling when -slave rotated the logs (only affected 3.23, not 4.0). -@item -Fixed problem in @code{LOCK TABLES} on windows when one connects to a -database that contains upper case letters. -@item -Fixed that @code{--skip-show-databases} doesn't reset the @code{--port} option. -@item -Small fix in @code{safe_mysqld} for some shells. -@item -Fixed that @code{FLUSH STATUS} doesn't reset @code{Delayed_insert_threads}. -@item -Fixed core dump bug when using the @code{BINARY} cast on a @code{NULL} value. -@item -Fixed race condition when someone did a @code{GRANT} at the same time a new -user logged in or did a @code{USE DATABASE}. -@item -Fixed bug in @code{ALTER TABLE} and @code{RENAME TABLE} when running with -@code{-O lower_case_table_names=1} (typically on windows) when giving the -table name in uppercase. -@item -Fixed that @code{-O lower_case_table_names=1} also converts database -names to lower case. -@item -Fixed unlikely core dump with @code{SELECT ... ORDER BY ... LIMIT}. -@item -Changed @code{AND/OR} to report that they can return NULL. This fixes a -bug in @code{GROUP BY} on @code{AND/OR} expressions that return -@code{NULL}. -@item -Fixed a bug that @code{OPTIMIZE} of locked and modified MyISAM table, -reported table corruption. -@item -Fixed a @code{BDB}-related @code{ALTER TABLE} bug with dropping a column -and shutting down immediately thereafter. -@item -Fixed problem with @code{configure ... --localstatedir=...}. -@item -Fixed problem with @code{UNSIGNED BIGINT} on AIX (again). -@item -Fixed bug in pthread_mutex_trylock() on HPUX 11.0. -@item -Multithreaded stress tests for InnoDB. -@end itemize - -@node News-3.23.52, News-3.23.51, News-3.23.53, News-3.23.x -@appendixsubsec Changes in release 3.23.52 (14 Aug 2002) -@itemize @bullet -@item -Wrap @code{BEGIN}/@code{COMMIT} around transaction in the binary log. -This makes replication honour transactions. -@item -Fixed security bug when having an empty database name in the @code{user.db} -table. -@item -Changed initialisation of @code{RND()} to make it less predicatable. -@item -Fixed problem with @code{GROUP BY} on result with expression that created a -@code{BLOB} field. -@item -Fixed problem with @code{GROUP BY} on columns that have NULL values. To -solve this we now create an MyISAM temporary table when doing a group by -on a possible NULL item. In MySQL 4.0.5 we can again use in memory HEAP -tables for this case. -@item -Fixed problem with privilege tables when downgrading from 4.0.2 to 3.23. -@item -Fixed thread bug in @code{SLAVE START}, @code{SLAVE STOP} and automatic repair -of MyISAM tables that could cause table cache to be corrupted. -@item -Fixed possible thread related key-cache-corruption problem with -@code{OPTIMIZE TABLE} and @code{REPAIR TABLE}. -@item -Added name of 'administrator command' logs. -@item -Fixed bug with creating an auto-increment value on second part of a -@code{UNIQUE()} key where first part could contain NULL values. -@item -Don't write slave-timeout reconnects to the error log. -@item -Fixed bug with slave net read timeouting -@item -Fixed a core-dump bug with @code{MERGE} tables and @code{MAX()} function. -@item -Fixed bug in @code{ALTER TABLE} with @code{BDB} tables. -@item -Fixed bug when logging @code{LOAD DATA INFILE} to binary log with no -active database. -@item -Fixed a bug in range optimiser (causing crashes). -@item -Fixed possible problem in replication when doing @code{DROP DATABASE} on a -database with @code{InnoDB} tables. -@item -Fixed that @code{mysql_info()} returns 0 for 'Duplicates' when using -@code{INSERT DELAYED IGNORE}. -@item -Added @code{-DHAVE_BROKEN_REALPATH} to the Mac OS X (darwin) compile -options in @file{configure.in} to fix a failure under high load. -@end itemize - -@node News-3.23.51, News-3.23.50, News-3.23.52, News-3.23.x -@appendixsubsec Changes in release 3.23.51 (31 May 2002) - -@itemize @bullet -@item -Fix bug with closing tags missing slash for @code{mysqldump} XML output. -@item -Remove end space from @code{ENUM} values. (This fixed a problem with -@code{SHOW CREATE TABLE}.) -@item -Fixed bug in @code{CONCAT_WS()} that cut the result. -@item -Changed name of server variables @code{Com_show_master_stat} to -@code{Com_show_master_status} and @code{Com_show_slave_stat} to -@code{Com_show_slave_status}. -@item -Changed handling of @code{gethostbyname()} to make the client library -thread-safe even if @code{gethostbyname_r} doesn't exist. -@item -Fixed core-dump problem when giving a wrong password string to @code{GRANT}. -@item -Fixed bug in @code{DROP DATABASE} with symlinked directory. -@item -Fixed optimisation problem with @code{DATETIME} and value outside -@code{DATETIME} range. -@item -Removed Sleepycat's @code{BDB} doc files from the source tree, as they're not -needed (MySQL covers @code{BDB} in its own documentation). -@item -Fixed MIT-pthreads to compile with @code{glibc} 2.2 (needed for -@code{make dist}). -@item -Fixed the @code{FLOAT(X+1,X)} is not converted to @code{FLOAT(X+2,X)}. -(This also affected @code{DECIMAL}, @code{DOUBLE} and @code{REAL} types) -@item -Fixed the result from @code{IF()} is case in-sensitive if the second and -third arguments are case sensitive. -@item -Fixed core dump problem on OSF/1 in @code{gethostbyname_r}. -@item -Fixed that underflowed decimal fields are not zero filled. -@item -If we get an overflow when inserting @code{'+11111'} for -@code{DECIMAL(5,0) UNSIGNED} columns, we will just drop the sign. -@item -Fixed optimisation bug with @code{ISNULL(expression_which_cannot_be_null)} and -@code{ISNULL(constant_expression)}. -@item -Fixed host lookup bug in the @code{glibc} library that we used with the 3.23.50 -Linux-x86 binaries. -@end itemize - -@node News-3.23.50, News-3.23.49, News-3.23.51, News-3.23.x -@appendixsubsec Changes in release 3.23.50 (21 Apr 2002) - -@itemize @bullet -@item -Fixed buffer overflow problem if someone specified a too long datadir -parameter to mysqld -@item -Add missing @code{<row>} tags for @code{mysqldump} XML output. -@item -Fixed problem with @code{crash-me} and @code{gcc} 3.0.4. -@item -Fixed that @code{@@@@unknown_variable} doesn't hang server. -@item -Added @code{@@@@VERSION} as a synonym for @code{VERSION()}. -@item -@code{SHOW VARIABLES LIKE 'xxx'} is now case-insensitive. -@item -Fixed timeout for @code{GET_LOCK()} on HP-UX with DCE threads. -@item -Fixed memory allocation bug in the glibc library used to build Linux -binaries, which caused mysqld to die in 'free()'. -@item -Fixed @code{SIGINT} and @code{SIGQUIT} problems in @code{mysql}. -@item -Fixed bug in character table converts when used with big ( > 64K) strings. -@item -@code{InnoDB} now retains foreign key constraints through @code{ALTER TABLE} -and @code{CREATE/DROP INDEX}. -@item -@code{InnoDB} now allows foreign key constraints to be added through the -@code{ALTER TABLE} syntax. -@item -@code{InnoDB} tables can now be set to automatically grow in size (autoextend). -@item -Our Linux RPMS and binaries are now compiled with @code{gcc} 3.0.4, which -should make them a bit faster. -@item -Fixed some buffer overflow problems when reading startup parameters. -@item -Because of problems on shutdown we have now disabled named pipes on -windows by default. One can enable named pipes by starting mysqld with -@code{--enable-named-pipe}. -@item -Fixed bug when using @code{WHERE key_column = 'J' or key_column='j'}. -@item -Fixed core-dump bug when using @code{--log-bin} with @code{LOAD DATA -INFILE} without an active database. -@item -Fixed bug in @code{RENAME TABLE} when used with -@code{lower_case_table_names=1} (default on Windows). -@item -Fixed unlikely core-dump bug when using @code{DROP TABLE} on a table -that was in use by a thread that also used queries on only temporary tables. -@item -Fixed problem with @code{SHOW CREATE TABLE} and @code{PRIMARY KEY} when using -32 indexes. -@item -Fixed that one can use @code{SET PASSWORD} for the anonymous user. -@item -Fixed core dump bug when reading client groups from option files using -@code{mysql_options()}. -@item -Memory leak (16 bytes per every @strong{corrupted} table) closed. -@item -Fixed binary builds to use @code{--enable-local-infile}. -@item -Update source to work with new version of @code{bison}. -@item -Updated shell scripts to now agree with new POSIX standard. -@item -Fixed bug where @code{DATE_FORMAT()} returned empty string when used -with @code{GROUP BY}. -@end itemize - -@node News-3.23.49, News-3.23.48, News-3.23.50, News-3.23.x -@appendixsubsec Changes in release 3.23.49 - -@itemize @bullet -@item -Don't give warning for a statement that is only a comment; this is needed for -@code{mysqldump --disable-keys} to work. -@item -Fixed unlikely caching bug when doing a join without keys. In this case -the last used field for a table always returned @code{NULL}. -@item -Added options to make @code{LOAD DATA LOCAL INFILE} more secure. -@item -MySQL binary release 3.23.48 for Linux contained a new @code{glibc} library, -which has serious problems under high load and RedHat 7.2. The 3.23.49 binary -release doesn't have this problem. -@item -Fixed shutdown problem on NT. -@end itemize - -@node News-3.23.48, News-3.23.47, News-3.23.49, News-3.23.x -@appendixsubsec Changes in release 3.23.48 (07 Feb 2002) - -@itemize @bullet -@item -Added @code{--xml} option to @code{mysqldump} for producing XML output. -@item -Changed to use @code{autoconf} 2.52 (from @code{autoconf} 2.13) -@item -Fixed bug in complicated join with @code{const} tables. -@item -Added internal safety checks for @code{InnoDB}. -@item -Some @code{InnoDB} variables were always shown in @code{SHOW VARIABLES} as -@code{OFF} on high-byte-first systems (like SPARC). -@item -Fixed problem with one thread using an @code{InnoDB} table and another -thread doing an @code{ALTER TABLE} on the same table. Before that, -@code{mysqld} could crash with an assertion failure in @file{row0row.c}, -line 474. -@item -Tuned the @code{InnoDB} SQL optimiser to favor index searches more often -over table scans. -@item -Fixed a performance problem with @code{InnoDB} tables when several large -@code{SELECT} queries are run concurrently on a multiprocessor Linux -computer. Large CPU-bound @code{SELECT} queries will now also generally -run faster on all platforms. -@item -If MySQL binlogging is used, @code{InnoDB} now prints after crash recovery the -latest MySQL binlog name and the offset @code{InnoDB} was able to recover -to. This is useful, for example, when resynchronising a master and a -slave database in replication. -@item -Added better error messages to help in installation problems of @code{InnoDB} -tables. -@item -It is now possible to recover MySQL temporary tables that have become -orphaned inside the @code{InnoDB} tablespace. -@item -@code{InnoDB} now prevents a @code{FOREIGN KEY} declaration where the -signedness is not the same in the referencing and referenced integer columns. -@item -Calling @code{SHOW CREATE TABLE} or @code{SHOW TABLE STATUS} could cause -memory corruption and make @code{mysqld} crash. Especially at risk was -@code{mysqldump}, because it frequently calls @code{SHOW CREATE TABLE}. -@item -If inserts to several tables containing an @code{AUTO_INCREMENT} column were -wrapped inside one @code{LOCK TABLES}, @code{InnoDB} asserted in -@file{lock0lock.c}. -@item -In 3.23.47 we allowed several @code{NULL} values in a @code{UNIQUE} secondary -index for an @code{InnoDB} table. But @code{CHECK TABLE} was not relaxed: it -reports the table as corrupt. @code{CHECK TABLE} no longer complains in -this situation. -@item -@code{SHOW GRANTS} now shows @code{REFERENCES} instead of @code{REFERENCE}. -@end itemize - -@node News-3.23.47, News-3.23.46, News-3.23.48, News-3.23.x -@appendixsubsec Changes in release 3.23.47 (27 Dec 2001) - -@itemize @bullet -@item -Fixed bug when using the following construct: -@code{SELECT ... WHERE key=@@var_name OR key=@@var_name2} -@item -Restrict @code{InnoDB} keys to 500 bytes. -@item -@code{InnoDB} now supports @code{NULL} in keys. -@item -Fixed shutdown problem on HP-UX. (Introduced in 3.23.46) -@item -Fixed core dump bug in replication when using @code{SELECT RELEASE_LOCK()}. -@item -Added new command: @code{DO expression,[expression]} -@item -Added @code{slave-skip-errors} option. -@item -Added statistics variables for all MySQL commands. (@code{SHOW STATUS} is -now much longer.) -@item -Fixed default values for @code{InnoDB} tables. -@item -Fixed that @code{GROUP BY expr DESC} works. -@item -Fixed bug when using @code{t1 LEFT JOIN t2 ON t2.key=constant}. -@item -@code{mysql_config} now also works with binary (relocated) distributions. -@end itemize - -@node News-3.23.46, News-3.23.45, News-3.23.47, News-3.23.x -@appendixsubsec Changes in release 3.23.46 (29 Nov 2001) - -@itemize @bullet -@item -Fixed problem with aliased temporary table replication. -@item -@code{InnoDB} and @code{BDB} tables will now use index when doing an -@code{ORDER BY} on the whole table. -@item -Fixed bug where one got an empty set instead of a DEADLOCK error when using -@code{BDB} tables. -@item -One can now kill @code{ANALYZE}, @code{REPAIR}, and @code{OPTIMIZE TABLE} when -the thread is waiting to get a lock on the table. -@item -Fixed race condition in @code{ANALYZE TABLE}. -@item -Fixed bug when joining with caching (unlikely to happen). -@item -Fixed race condition when using the binary log and @code{INSERT DELAYED} -which could cause the binary log to have rows that were not yet written -to @code{MyISAM} tables. -@item -Changed caching of binary log to make replication slightly faster. -@item -Fixed bug in replication on Mac OS X. -@end itemize - -@node News-3.23.45, News-3.23.44, News-3.23.46, News-3.23.x -@appendixsubsec Changes in release 3.23.45 (22 Nov 2001) - -@itemize @bullet -@item -@code{(UPDATE|DELETE) ...WHERE MATCH} bugfix. -@item -shutdown should now work on Darwin (Mac OS X). -@item -Fixed core dump when repairing corrupted packed @code{MyISAM} files. -@item -@code{--core-file} now works on Solaris. -@item -Fix a bug which could cause @code{InnoDB} to complain if it cannot find -free blocks from the buffer cache during recovery. -@item -Fixed bug in @code{InnoDB} insert buffer B-tree handling that could cause -crashes. -@item -Fixed bug in @code{InnoDB} lock timeout handling. -@item -Fixed core dump bug in @code{ALTER TABLE} on a @code{TEMPORARY} @code{InnoDB} -table. -@item -Fixed bug in @code{OPTIMIZE TABLE} that reset index cardinality if it -was up to date. -@item -Fixed problem with @code{t1 LEFT_JOIN t2 ... WHERE t2.date_column IS NULL} when -date_column was declared as @code{NOT NULL}. -@item -Fixed bug with @code{BDB} tables and keys on @code{BLOB} columns. -@item -Fixed bug in @code{MERGE} tables on OS with 32-bit file pointers. -@item -Fixed bug in @code{TIME_TO_SEC()} when using negative values. -@end itemize - -@node News-3.23.44, News-3.23.43, News-3.23.45, News-3.23.x -@appendixsubsec Changes in release 3.23.44 (31 Oct 2001) - -@itemize @bullet -@item -Fixed @code{Rows_examined} count in slow query log. -@item -Fixed bug when using a reference to an @code{AVG()} column in @code{HAVING}. -@item -Fixed that date functions that require correct dates, like -@code{DAYOFYEAR(column)}, will return @code{NULL} for @code{0000-00-00} dates. -@item -Fixed bug in const-propagation when comparing columns of different -types. (@code{SELECT * FROM date_col="2001-01-01" and date_col=time_col}) -@item -Fixed bug that caused error message @code{Can't write, because of unique -constraint} with some @code{GROUP BY} queries. -@item -Fixed problem with @code{sjis} character strings used within quoted table -names. -@item -Fixed core dump when using @code{CREATE ... FULLTEXT} keys with other table -handlers than @code{MyISAM}. -@item -Don't use @code{signal()} on Windows because this appears to not be -100% reliable. -@item -Fixed bug when doing @code{WHERE col_name=NULL} on an indexed column -that had @code{NULL} values. -@item -Fixed bug when doing @code{LEFT JOIN ... ON (col_name = constant) WHERE col_name = constant}. -@item -When using replications, aborted queries that contained @code{%} could cause -a core dump. -@item -@code{TCP_NODELAY} was not used on some systems. (Speed problem.) -@item -Applied portability fixes for OS/2. (Patch by Yuri Dario.) -@end itemize - -The following changes are for @code{InnoDB} tables: - -@itemize @bullet -@item -Add missing @code{InnoDB} variables to @code{SHOW VARIABLES}. -@item -Foreign keys checking is now done for @code{InnoDB} tables. -@item -@code{DROP DATABASE} now works also for @code{InnoDB} tables. -@item -@code{InnoDB} now supports datafiles and raw disk partitions bigger -than 4 GB on those operating systems that have big files. -@item -@code{InnoDB} calculates better table cardinality estimates for the -MySQL optimiser. -@item -Accent characters in the default character set @code{latin1} are ordered -according to the MySQL ordering. - -Note: if you are using @code{latin1} and have inserted characters whose -code is greater than 127 into an indexed @code{CHAR} column, you should -run @code{CHECK TABLE} on your table when you upgrade to 3.23.44, and -drop and reimport the table if @code{CHECK TABLE} reports an error! -@item -A new @file{my.cnf} parameter, @code{innodb_thread_concurrency}, helps in -performance tuning in heavily concurrent environments. -@item -A new @file{my.cnf} parameter, @code{innodb_fast_shutdown}, speeds up -server shutdown. -@item -A new @file{my.cnf} parameter, @code{innodb_force_recovery}, helps to save -your data in case the disk image of the database becomes corrupt. -@item -@code{innodb_monitor} has been improved and a new -@code{innodb_table_monitor} added. -@item -Increased maximum key length from 500 to 7000 bytes. -@item -Fixed a bug in replication of @code{AUTO_INCREMENT} columns with -multiple-line inserts. -@item -Fixed a bug when the case of letters changes in an update of an indexed -secondary column. -@item -Fixed a hang when there are > 24 datafiles. -@item -Fixed a crash when @code{MAX(col)} is selected from an empty table, and -@code{col} is not the first column in a multi-column index. -@item -Fixed a bug in purge which could cause crashes. -@end itemize - -@node News-3.23.43, News-3.23.42, News-3.23.44, News-3.23.x -@appendixsubsec Changes in release 3.23.43 (04 Oct 2001) - -@itemize @bullet -@item -Fixed a bug in @code{INSERT DELAYED} and @code{FLUSH TABLES} introduced -in 3.23.42. -@item -Fixed unlikely bug, which returned non-matching rows, in @code{SELECT} with -many tables and multi-column indexes and 'range' type. -@item -Fixed an unlikely core dump bug when doing @code{EXPLAIN SELECT} when using -many tables and @code{ORDER BY}. -@item -Fixed bug in @code{LOAD DATA FROM MASTER} when using table with -@code{CHECKSUM=1}. -@item -Added unique error message when one gets a DEADLOCK during a transaction with -@code{BDB} tables. -@item -Fixed problem with @code{BDB} tables and @code{UNIQUE} columns defined -as @code{NULL}. -@item -Fixed problem with @code{myisampack} when using pre-space filled @code{CHAR} -columns. -@item -Applied patch from Yuri Dario for OS/2. -@item -Fixed bug in @code{--safe-user-create}. -@end itemize - -@node News-3.23.42, News-3.23.41, News-3.23.43, News-3.23.x -@appendixsubsec Changes in release 3.23.42 (08 Sep 2001) - -@itemize @bullet -@item -Fixed problem when using @code{LOCK TABLES} and @code{BDB} tables. -@item -Fixed problem with @code{REPAIR TABLE} on @code{MyISAM} tables with row -lengths in the range from 65517 to 65520 bytes. -@item -Fixed rare hang when doing @code{mysqladmin shutdown} when there was -a lot of activity in other threads. -@item -Fixed problem with @code{INSERT DELAYED} where delay thread could be -hanging on @code{upgrading locks} with no apparent reason. -@item -Fixed problem with @code{myisampack} and @code{BLOB}. -@item -Fixed problem when one edited @file{.MRG} tables by hand. -(Patch from Benjamin Pflugmann). -@item -Enforce that all tables in a @code{MERGE} table come from the same -database. -@item -Fixed bug with @code{LOAD DATA INFILE} and transactional tables. -@item -Fix bug when using @code{INSERT DELAYED} with wrong column definition. -@item -Fixed core dump during @code{REPAIR} of some particularly broken tables. -@item -Fixed bug in @code{InnoDB} and @code{AUTO_INCREMENT} columns. -@item -Fixed bug in @code{InnoDB} and @code{RENAME TABLE} columns. -@item -Fixed critical bug in @code{InnoDB} and @code{BLOB} columns. If you have -used @code{BLOB} columns larger than 8000 bytes in an @code{InnoDB} -table, it is necessary to dump the table with @code{mysqldump}, drop it and -restore it from the dump. -@item -Applied large patch for OS/2 from Yuri Dario. -@item -Fixed problem with @code{InnoDB} when one could get the error @code{Can't -execute the given command...} even when no transaction was active. -@item -Applied some minor fixes that concern Gemini. -@item -Use real arithmetic operations even in integer context if not -all arguments are integers. (Fixes uncommon bug in some integer -contexts). -@item -Don't force everything to lowercase on Windows. (To fix problem -with Windows and @code{ALTER TABLE}). Now @code{--lower_case_names} -also works on Unix. -@item -Fixed that automatic rollback is done when thread end doesn't lock -other threads. -@end itemize - -@node News-3.23.41, News-3.23.40, News-3.23.42, News-3.23.x -@appendixsubsec Changes in release 3.23.41 (11 Aug 2001) - -@itemize @bullet -@item -Added @code{--sql-mode=option[,option[,option]]} option to @code{mysqld}. -@xref{Command-line options}. -@item -Fixed possible problem with @code{shutdown} on Solaris where the -@file{.pid} file wasn't deleted. -@item -@code{InnoDB} now supports < 4 GB rows. The former limit was 8000 bytes. -@item -The @code{doublewrite} file flush method is used in @code{InnoDB}. -It reduces the need for Unix @code{fsync()} calls to a fraction and -improves performance on most Unix flavors. -@item -You can now use the @code{InnoDB} Monitor to print a lot of @code{InnoDB} state -information, including locks, to the standard output. This is useful in -performance tuning. -@item -Several bugs which could cause hangs in @code{InnoDB} have been fixed. -@item -Split @code{record_buffer} to @code{record_buffer} and -@code{record_rnd_buffer}. To make things compatible to previous MySQL -versions, if @code{record_rnd_buffer} is not set, then it takes the -value of @code{record_buffer}. -@item -Fixed optimising bug in @code{ORDER BY} where some @code{ORDER BY} parts -where wrongly removed. -@item -Fixed overflow bug with @code{ALTER TABLE} and @code{MERGE} tables. -@item -Added prototypes for @code{my_thread_init()} and @code{my_thread_end()} to -@file{mysql_com.h} -@item -Added @code{--safe-user-create} option to @code{mysqld}. -@item -Fixed bug in @code{SELECT DISTINCT ... HAVING} that caused error message -@code{Can't find record in #...} -@end itemize - - -@node News-3.23.40, News-3.23.39, News-3.23.41, News-3.23.x -@appendixsubsec Changes in release 3.23.40 - -@itemize @bullet -@item -Fixed problem with @code{--low-priority-updates} and @code{INSERT} statements. -@item -Fixed bug in slave thread when under some rare circumstances it could -get 22 bytes ahead on the offset in the master. -@item -Added @code{slave_net_timeout} for replication. -@item -Fixed problem with @code{UPDATE} and @code{BDB} tables. -@item -Fixed hard bug in @code{BDB} tables when using key parts. -@item -Fixed problem when using @code{GRANT FILE ON database.* ...}; previously -we added the @code{DROP} privilege for the database. -@item -Fixed @code{DELETE FROM tbl_name ... LIMIT 0} and -@code{UPDATE FROM tbl_name ... LIMIT 0}, which acted as though the -@code{LIMIT} clause was not present (they deleted or updated all selected -rows). -@item -@code{CHECK TABLE} now checks if an @code{AUTO_INCREMENT} column contains -the value 0. -@item -Sending a @code{SIGHUP} to @code{mysqld} will now only flush the logs, -not reset the replication. -@item -Fixed parser to allow floats of type @code{1.0e1} (no sign after @code{e}). -@item -Option @code{--force} to @code{myisamchk} now also updates states. -@item -Added option @code{--warnings} to @code{mysqld}. Now @code{mysqld} -prints the error @code{Aborted connection} only if this option is used. -@item -Fixed problem with @code{SHOW CREATE TABLE} when you didn't have a -@code{PRIMARY KEY}. -@item -Properly fixed the rename of @code{innodb_unix_file_flush_method} variable to -@code{innodb_flush_method}. -@item -Fixed bug when converting @code{BIGINT UNSIGNED} to @code{DOUBLE}. This caused -a problem when doing comparisons with @code{BIGINT} values outside of the -signed range. -@item -Fixed bug in @code{BDB} tables when querying empty tables. -@item -Fixed a bug when using @code{COUNT(DISTINCT)} with @code{LEFT JOIN} and -there weren't any matching rows. -@item -Removed all documentation referring to the @code{GEMINI} table -type. @code{GEMINI} is not released under an @code{Open Source} license. -@end itemize - - -@node News-3.23.39, News-3.23.38, News-3.23.40, News-3.23.x -@appendixsubsec Changes in release 3.23.39 (12 Jun 2001) - -@itemize @bullet -@item -The @code{AUTO_INCREMENT} sequence wasn't reset when dropping -and adding an @code{AUTO_INCREMENT} column. -@item -@code{CREATE ... SELECT} now creates non-unique indexes delayed. -@item -Fixed problem where @code{LOCK TABLES tbl_name READ} followed by -@code{FLUSH TABLES} put an exclusive lock on the table. -@item -@code{REAL @@variable} values were represented with only 2 digits when -converted to strings. -@item -Fixed problem that client ``hung'' when @code{LOAD TABLE FROM MASTER} failed. -@item -@code{myisamchk --fast --force} will no longer repair tables -that only had the open count wrong. -@item -Added functions to handle symbolic links to make life easier in 4.0. -@item -We are now using the @code{-lcma} thread library on HP-UX 10.20 so -that MySQL will be more stable on HP-UX. -@item -Fixed problem with @code{IF()} and number of decimals in the result. -@item -Fixed date-part extraction functions to work with dates where day -and/or month is 0. -@item -Extended argument length in option files from 256 to 512 chars. -@item -Fixed problem with shutdown when @code{INSERT DELAYED} was waiting for -a @code{LOCK TABLE}. -@item -Fixed core dump bug in @code{InnoDB} when tablespace was full. -@item -Fixed problem with @code{MERGE} tables and big tables (> 4G) when using -@code{ORDER BY}. -@end itemize - - -@node News-3.23.38, News-3.23.37, News-3.23.39, News-3.23.x -@appendixsubsec Changes in release 3.23.38 (09 May 2001) - -@itemize @bullet -@item -Fixed a bug when @code{SELECT} from @code{MERGE} table -sometimes results in incorrectly ordered rows. -@item -Fixed a bug in @code{REPLACE()} when using the @code{ujis} character set. -@item -Applied Sleepycat @code{BDB} patches 3.2.9.1 and 3.2.9.2. -@item -Added @code{--skip-stack-trace} option to @code{mysqld}. -@item -@code{CREATE TEMPORARY} now works with @code{InnoDB} tables. -@item -@code{InnoDB} now promotes sub keys to whole keys. -@item -Added option @code{CONCURRENT} to @code{LOAD DATA}. -@item -Better error message when slave @code{max_allowed_packet} is too low to -read a very long log event from the master. -@item -Fixed bug when too many rows where removed when using -@code{SELECT DISTINCT ... HAVING}. -@item -@code{SHOW CREATE TABLE} now returns @code{TEMPORARY} for temporary tables. -@item -Added @code{Rows_examined} to slow query log. -@item -Fixed problems with function returning empty string when used together with -a group function and a @code{WHERE} that didn't match any rows. -@item -New program @code{mysqlcheck}. -@item -Added database name to output for administrative commands like @code{CHECK}, -@code{REPAIR}, @code{OPTIMIZE}. -@item -Lots of portability fixes for @code{InnoDB}. -@item -Changed optimiser so that queries like -@code{SELECT * FROM tbl_name,tbl_name2 ... ORDER BY key_part1 LIMIT #} -will use index on @code{key_part1} instead of @code{filesort}. -@item -Fixed bug when doing -@code{LOCK TABLE to_table WRITE,...; INSERT INTO to_table... SELECT ...} -when @code{to_table} was empty. -@item -Fixed bug with @code{LOCK TABLE} and @code{BDB} tables. -@end itemize - - -@node News-3.23.37, News-3.23.36, News-3.23.38, News-3.23.x -@appendixsubsec Changes in release 3.23.37 (17 Apr 2001) - -@itemize @bullet -@item -Fixed a bug when using @code{MATCH()} in @code{HAVING} clause. -@item -Fixed a bug when using @code{HEAP} tables with @code{LIKE}. -@item -Added @code{--mysql-version} option to @code{safe_mysqld} -@item -Changed @code{INNOBASE} to @code{InnoDB} (because the @code{INNOBASE} -name was already used). All @code{configure} options and @code{mysqld} -start options now use @code{innodb} instead of @code{innobase}. This -means that before upgrading to this version, you have to change any -configuration files where you have used @code{innobase} options! -@item -Fixed bug when using indexes on @code{CHAR(255) NULL} columns. -@item -Slave thread will now be started even if @code{master-host} is not set, as -long as @code{server-id} is set and valid @file{master.info} is present. -@item -Partial updates (terminated with kill) are now logged with a special error -code to the binary log. Slave will refuse to execute them if the error code -indicates the update was terminated abnormally, and will have to be recovered -with @code{SET SQL_SLAVE_SKIP_COUNTER=1; SLAVE START} after a manual -sanity check/correction of data integrity. Update: In 4.0.3 and above -you have to use @code{SET GLOBAL}. -@item -Fixed bug that erroneously logged a drop of internal temporary table -on thread termination to the binary log -- this bug affected replication. -@item -Fixed a bug in @code{REGEXP} on 64-bit machines. -@item -@code{UPDATE} and @code{DELETE} with @code{WHERE unique_key_part IS NULL} -didn't update/delete all rows. -@item -Disabled @code{INSERT DELAYED} for tables that support transactions. -@item -Fixed bug when using date functions on @code{TEXT}/@code{BLOB} column -with wrong date format. -@item -UDFs now also work on Windows. (Patch by Ralph Mason.) -@item -Fixed bug in @code{ALTER TABLE} and @code{LOAD DATA INFILE} that disabled -key-sorting. These commands should now be faster in most cases. -@item -Fixed performance bug where reopened tables (tables that had been -waiting for @code{FLUSH} or @code{REPAIR}) would not use indexes for the -next query. -@item -Fixed problem with @code{ALTER TABLE} to @code{InnoDB} tables on FreeBSD. -@item -Added @code{mysqld} variables @code{myisam_max_sort_file_size} and -@code{myisam_max_extra_sort_file_size}. -@item -Initialise signals early to avoid problem with signals in @code{InnoDB}. -@item -Applied patch for the @code{tis620} character set to make comparisons -case-independent and to fix a bug in @code{LIKE} for this character set. -@strong{Note}: All tables that uses the @code{tis620} character set must be -fixed with @code{myisamchk -r} or @code{REPAIR TABLE} ! -@item -Added @code{--skip-safemalloc} option to @code{mysqld}. -@end itemize - - -@node News-3.23.36, News-3.23.35, News-3.23.37, News-3.23.x -@appendixsubsec Changes in release 3.23.36 (27 Mar 2001) - -@itemize @bullet -@item -Fixed a bug that allowed use of database names containing a @samp{.} -character. This fixes a serious security issue when @code{mysqld} is run -as root. -@item -Fixed bug when thread creation failed (could happen when doing a @strong{lot} -of connections in a short time). -@item -Fixed some problems with @code{FLUSH TABLES} and @code{TEMPORARY} tables. -(Problem with freeing the key cache and error @code{Can't reopen table...}.) -@item -Fixed a problem in @code{InnoDB} with other character sets than @code{latin1} -and another problem when using many columns. -@item -Fixed bug that caused a core dump when using a very complex query involving -@code{DISTINCT} and summary functions. -@item -Added @code{SET TRANSACTION ISOLATION LEVEL ...} -@item -Added @code{SELECT ... FOR UPDATE}. -@item -Fixed bug where the number of affected rows was not returned when MySQL -was compiled without transaction support. -@item -Fixed a bug in @code{UPDATE} where keys weren't always used to find the -rows to be updated. -@item -Fixed a bug in @code{CONCAT_WS()} where it returned incorrect results. -@item -Changed @code{CREATE ... SELECT} and @code{INSERT ... SELECT} to not -allow concurrent inserts as this could make the binary log hard to repeat. -(Concurrent inserts are enabled if you are not using the binary or update log.) -@item -Changed some macros to be able to use fast mutex with @code{glibc} 2.2. -@end itemize - - -@node News-3.23.35, News-3.23.34a, News-3.23.36, News-3.23.x -@appendixsubsec Changes in release 3.23.35 (15 Mar 2001) - -@itemize @bullet -@item -Fixed newly introduced bug in @code{ORDER BY}. -@item -Fixed wrong define @code{CLIENT_TRANSACTIONS}. -@item -Fixed bug in @code{SHOW VARIABLES} when using @code{INNOBASE} tables. -@item -Setting and using user variables in @code{SELECT DISTINCT} didn't work. -@item -Tuned @code{SHOW ANALYZE} for small tables. -@item -Fixed handling of arguments in the benchmark script @code{run-all-tests}. -@end itemize - - -@node News-3.23.34a, News-3.23.34, News-3.23.35, News-3.23.x -@appendixsubsec Changes in release 3.23.34a - -@itemize @bullet -@item -Added extra files to the distribution to allow @code{INNOBASE} support -to be compiled. -@end itemize - - -@node News-3.23.34, News-3.23.33, News-3.23.34a, News-3.23.x -@appendixsubsec Changes in release 3.23.34 (10 Mar 2001) - -@itemize @bullet -@item -Added the @code{INNOBASE} table handler and the @code{BDB} table handler -to the MySQL source distribution. -@item -Updated the documentation about @code{GEMINI} tables. -@item -Fixed a bug in @code{INSERT DELAYED} that caused threads to hang when -inserting @code{NULL} into an @code{AUTO_INCREMENT} column. -@item -Fixed a bug in @code{CHECK TABLE} / @code{REPAIR TABLE} that could cause -a thread to hang. -@item -@code{REPLACE} will not replace a row that conflicts with an -@code{AUTO_INCREMENT} generated key. -@item -@code{mysqld} now only sets @code{CLIENT_TRANSACTIONS} in -@code{mysql->server_capabilities} if the server supports a -transaction-safe handler. -@item -Fixed @code{LOAD DATA INFILE} to allow numeric values to be read into -@code{ENUM} and @code{SET} columns. -@item -Improved error diagnostic for slave thread exit. -@item -Fixed bug in @code{ALTER TABLE ... ORDER BY}. -@item -Added @code{max_user_connections} variable to @code{mysqld}. -@item -Limit query length for replication by @code{max_allowed_packet}, not the -arbitrary limit of 4 MB. -@item -Allow space around @code{=} in argument to @code{--set-variable}. -@item -Fixed problem in automatic repair that could leave some threads in state -@code{Waiting for table}. -@item -@code{SHOW CREATE TABLE} now displays the @code{UNION()} for @code{MERGE} -tables. -@item -@code{ALTER TABLE} now remembers the old @code{UNION()} definition. -@item -Fixed bug when replicating timestamps. -@item -Fixed bug in bidirectional replication. -@item -Fixed bug in the @code{BDB} table handler that occurred when using an index -on multi-part key where a key part may be @code{NULL}. -@item -Fixed @code{MAX()} optimisation on sub-key for @code{BDB} tables. -@item -Fixed problem where garbage results were returned when using @code{BDB} -tables and @code{BLOB} or @code{TEXT} fields when joining many tables. -@item -Fixed a problem with @code{BDB} tables and @code{TEXT} columns. -@item -Fixed bug when using a @code{BLOB} key where a const row wasn't found. -@item -Fixed that @code{mysqlbinlog} writes the timestamp value for each query. -This ensures that one gets same values for date functions like @code{NOW()} -when using @code{mysqlbinlog} to pipe the queries to another server. -@item -Allow @code{--skip-gemini}, @code{--skip-bdb}, and @code{--skip-innodb} -options to be specified when invoking @code{mysqld}, even if these table -handlers are not compiled in to @code{mysqld}. -@item -One can now do @code{GROUP BY ... DESC}. -@item -Fixed a deadlock in the @code{SET} code, when one ran @code{SET @@foo=bar}, -where @code{bar} is a column reference, an error was not properly generated. -@end itemize - - -@node News-3.23.33, News-3.23.32, News-3.23.34, News-3.23.x -@appendixsubsec Changes in release 3.23.33 (09 Feb 2001) - -@itemize @bullet -@item -Fixed DNS lookups not to use the same mutex as the hostname -cache. This will enable known hosts to be quickly resolved even if a -DNS lookup takes a long time. -@item -Added @code{--character-sets-dir} option to @code{myisampack}. -@item -Removed warnings when running @code{REPAIR TABLE ... EXTENDED}. -@item -Fixed a bug that caused a core dump when using @code{GROUP BY} on an alias, -where the alias was the same as an existing column name. -@item -Added @code{SEQUENCE()} as an example UDF function. -@item -Changed @code{mysql_install_db} to use @code{BINARY} for @code{CHAR} -columns in the privilege tables. -@item -Changed @code{TRUNCATE tbl_name} to @code{TRUNCATE TABLE tbl_name} -to use the same syntax as Oracle. Until 4.0 we will also allow -@code{TRUNCATE tbl_name} to not crash old code. -@item -Fixed ``no found rows'' bug in @code{MyISAM} tables when a @code{BLOB} was -first part of a multi-part key. -@item -Fixed bug where @code{CASE} didn't work with @code{GROUP BY}. -@item -Added @code{--sort-recover} option to @code{myisamchk}. -@item -@code{myisamchk -S} and @code{OPTIMIZE TABLE} now work on Windows. -@item -Fixed bug when using @code{DISTINCT} on results from functions that referred -to a group function, like: -@example -SELECT a, DISTINCT SEC_TO_TIME(SUM(a)) -FROM tbl_name GROUP BY a, b; -@end example -@item -Fixed buffer overrun in @code{libmysqlclient} library. -Fixed bug in handling @code{STOP} event after @code{ROTATE} event in -replication. -@item -Fixed another buffer overrun in @code{DROP DATABASE}. -@item -Added @code{Table_locks_immediate} and @code{Table_locks_waited} status -variables. -@item -Fixed bug in replication that broke slave server start with existing -@file{master.info}. This fixes a bug introduced in 3.23.32. -@item -Added @code{SET SQL_SLAVE_SKIP_COUNTER=n} command to recover from -replication glitches without a full database copy. -@item -Added @code{max_binlog_size} variable; the binary log will be rotated -automatically when the size crosses the limit. -@item -Added @code{Last_error}, @code{Last_errno}, and @code{Slave_skip_counter} -variables to @code{SHOW SLAVE STATUS}. -@item -Fixed bug in @code{MASTER_POS_WAIT()} function. -@item -Execute core dump handler on @code{SIGILL}, and @code{SIGBUS} in addition to -@code{SIGSEGV}. -@item -On x86 Linux, print the current query and thread (connection) id, if -available, in the core dump handler. -@item -Fixed several timing bugs in the test suite. -@item -Extended @code{mysqltest} to take care of the timing issues in the test -suite. -@item -@code{ALTER TABLE} can now be used to change the definition for a -@code{MERGE} table. -@item -Fixed creation of @code{MERGE} tables on Windows. -@item -Portability fixes for OpenBSD and OS/2. -@item -Added @code{--temp-pool} option to @code{mysqld}. Using this option -will cause most temporary files created to use a small set of names, -rather than a unique name for each new file. This is to work around a -problem in the Linux kernel dealing with creating a bunch of new files -with different names. With the old behaviour, Linux seems to "leak" -memory, as it's being allocated to the directory entry cache instead of -the disk cache. -@end itemize - - -@node News-3.23.32, News-3.23.31, News-3.23.33, News-3.23.x -@appendixsubsec Changes in release 3.23.32 (22 Jan 2001: Stable) - -@itemize @bullet -@item -Changed code to get around compiler bug in Compaq C++ on OSF/1, that broke -@code{BACKUP}, @code{RESTORE}, @code{CHECK}, @code{REPAIR}, and -@code{ANALYZE TABLE}. -@item -Added option @code{FULL} to @code{SHOW COLUMNS}. Now we show the -privilege list for the columns only if this option is given. -@item -Fixed bug in @code{SHOW LOGS} when there weren't any @code{BDB} logs. -@item -Fixed a timing problem in replication that could delay sending an update -to the client until a new update was done. -@item -Don't convert field names when using @code{mysql_list_fields()}. This is -to keep this code compatible with @code{SHOW FIELDS}. -@item -@code{MERGE} tables didn't work on Windows. -@item -Fixed problem with @code{SET PASSWORD=...} on Windows. -@item -Added missing @file{my_config.h} to RPM distribution. -@item -@code{TRIM("foo" from "foo")} didn't return an empty string. -@item -Added @code{--with-version-suffix} option to @code{configure}. -@item -Fixed core dump when client aborted connection without @code{mysql_close()}. -@item -Fixed a bug in @code{RESTORE TABLE} when trying to restore from a non-existent -directory. -@item -Fixed a bug which caused a core dump on the slave when replicating -@code{SET PASSWORD}. -@item -Added @code{MASTER_POS_WAIT()}. -@end itemize - - -@node News-3.23.31, News-3.23.30, News-3.23.32, News-3.23.x -@appendixsubsec Changes in release 3.23.31 (17 Jan 2001) - -@itemize @bullet -@item -The test suite now tests all reachable @code{BDB} interface code. During -testing we found and fixed many errors in the interface code. -@item -Using @code{HAVING} on an empty table could produce one result row when -it shouldn't. -@item -Fixed the MySQL RPM not to depend on Perl5 anymore. -@item -Fixed some problems with @code{HEAP} tables on Windows. -@item -@code{SHOW TABLE STATUS} didn't show correct average row length for tables -larger than 4G. -@item -@code{CHECK TABLE ... EXTENDED} didn't check row links for fixed size tables. -@item -Added option @code{MEDIUM} to @code{CHECK TABLE}. -@item -Fixed problem when using @code{DECIMAL()} keys on negative numbers. -@item -@code{HOUR()} (and some other @code{TIME} functions) on a @code{CHAR} column -always returned @code{NULL}. -@item -Fixed security bug in something (please upgrade if you are using an earlier -MySQL 3.23 version). -@item -Fixed buffer overflow bug when writing a certain error message. -@item -Added usage of @code{setrlimit()} on Linux to get -@code{-O --open-files-limit=#} to work on Linux. -@item -Added @code{bdb_version} variable to @code{mysqld}. -@item -Fixed bug when using expression of type: -@example -SELECT ... FROM t1 LEFT JOIN t2 ON (t1.a=t2.a) WHERE t1.a=t2.a -@end example -In this case the test in the @code{WHERE} clause was wrongly optimised away. -@item -Fixed bug in @code{MyISAM} when deleting keys with possible @code{NULL} -values, but the first key-column was not a prefix-compressed text column. -@item -Fixed @code{mysql.server} to read the @code{[mysql.server]} option file group -rather than the @code{[mysql_server]} group. -@item -Fixed @code{safe_mysqld} and @code{mysql.server} to also read the -@code{server} option section. -@item -Added @code{Threads_created} status variable to @code{mysqld}. -@end itemize - - -@node News-3.23.30, News-3.23.29, News-3.23.31, News-3.23.x -@appendixsubsec Changes in release 3.23.30 (04 Jan 2001) - -@itemize @bullet -@item -Added @code{SHOW OPEN TABLES} command. -@item -Fixed that @code{myisamdump} works against old @code{mysqld} servers. -@item -Fixed @code{myisamchk -k#} so that it works again. -@item -Fixed a problem with replication when the binary log file went over 2G -on 32-bit systems. -@item -@code{LOCK TABLES} will now automatically start a new transaction. -@item -Changed @code{BDB} tables to not use internal subtransactions and reuse -open files to get more speed. -@item -Added @code{--mysqld=#} option to @code{safe_mysqld}. -@item -Allow hex constants in the @code{--fields-*-by} and -@code{--lines-terminated-by} options to @code{mysqldump} and -@code{mysqlimport}. By Paul DuBois. -@item -Added @code{--safe-show-database} option to @code{mysqld}. -@item -Added @code{have_bdb}, @code{have_gemini}, @code{have_innobase}, -@code{have_raid} and @code{have_openssl} to @code{SHOW VARIABLES} to make it -easy to test for supported extensions. -@item -Added @code{--open-files-limit} option to @code{mysqld}. -@item -Changed @code{--open-files} option to @code{--open-files-limit} in -@code{safe_mysqld}. -@item -Fixed a bug where some rows were not found with @code{HEAP} tables -that had many keys. -@item -Fixed that @code{--bdb-no-sync} works. -@item -Changed @code{--bdb-recover} to @code{--bdb-no-recover} as recover should -be on by default. -@item -Changed the default number of @code{BDB} locks to 10000. -@item -Fixed a bug from 3.23.29 when allocating the shared structure needed -for @code{BDB} tables. -@item -Changed @code{mysqld_multi.sh} to use configure variables. Patch by -Christopher McCrory. -@item -Added fixing of include files for Solaris 2.8. -@item -Fixed bug with @code{--skip-networking} on Debian Linux. -@item -Fixed problem that some temporary files where reported as having the -name @code{UNOPENED} in error messages. -@item -Fixed bug when running two simultaneous @code{SHOW LOGS} queries. -@end itemize - - -@node News-3.23.29, News-3.23.28, News-3.23.30, News-3.23.x -@appendixsubsec Changes in release 3.23.29 (16 Dec 2000) - -@itemize @bullet -@item -Configure updates for Tru64, large file support, and better TCP wrapper -support. By Albert Chin-A-Young. -@item -Fixed bug in @code{<=>} operator. -@item -Fixed bug in @code{REPLACE} with @code{BDB} tables. -@item -@code{LPAD()} and @code{RPAD()} will shorten the result string if it's longer -than the length argument. -@item -Added @code{SHOW LOGS} command. -@item -Remove unused @code{BDB} logs on shutdown. -@item -When creating a table, put @code{PRIMARY} keys first, followed by -@code{UNIQUE} keys. -@item -Fixed a bug in @code{UPDATE} involving multi-part keys where one -specified all key parts both in the update and the @code{WHERE} part. In -this case MySQL could try to update a record that didn't match -the whole @code{WHERE} part. -@item -Changed drop table to first drop the tables and then the @file{.frm} file. -@item -Fixed a bug in the hostname cache which caused @code{mysqld} to report the -hostname as @code{''} in some error messages. -@item -Fixed a bug with @code{HEAP} type tables; the variable -@code{max_heap_table_size} wasn't used. Now either @code{MAX_ROWS} or -@code{max_heap_table_size} can be used to limit the size of a @code{HEAP} -type table. -@item -Changed the default server-id to 1 for masters and 2 for slaves -to make it easier to use the binary log. -@item -Renamed @code{bdb_lock_max} variable to @code{bdb_max_lock}. -@item -Added support for @code{AUTO_INCREMENT} on sub-fields for @code{BDB} tables. -@item -Added @code{ANALYZE} of @code{BDB} tables. -@item -In @code{BDB} tables, we now store the number of rows; this helps to optimise -queries when we need an approximation of the number of rows. -@item -If we get an error in a multi-row statement, we now only roll back the -last statement, not the entire transaction. -@item -If you do a @code{ROLLBACK} when you have updated a non-transactional table -you will get an error as a warning. -@item -Added @code{--bdb-shared-data} option to @code{mysqld}. -@item -Added @code{Slave_open_temp_tables} status variable to @code{mysqld} -@item -Added @code{binlog_cache_size} and @code{max_binlog_cache_size} variables to -@code{mysqld}. -@item -@code{DROP TABLE}, @code{RENAME TABLE}, @code{CREATE INDEX} and -@code{DROP INDEX} are now transaction endpoints. -@item -If you do a @code{DROP DATABASE} on a symbolically linked database, both -the link and the original database is deleted. -@item -Fixed @code{DROP DATABASE} to work on OS/2. -@item -Fixed bug when doing a @code{SELECT DISTINCT ... table1 LEFT JOIN -table2 ...} when @code{table2} was empty. -@item -Added @code{--abort-slave-event-count} and -@code{--disconnect-slave-event-count} options to @code{mysqld} for -debugging and testing of replication. -@item -Fixed replication of temporary tables. Handles everything except -slave server restart. -@item -@code{SHOW KEYS} now shows whether key is @code{FULLTEXT}. -@item -New script @code{mysqld_multi}. @xref{mysqld_multi, , @code{mysqld_multi}}. -@item -Added new script, @code{mysql-multi.server.sh}. Thanks to -Tim Bunce @email{Tim.Bunce@@ig.co.uk} for modifying @code{mysql.server} to -easily handle hosts running many @code{mysqld} processes. -@item -@code{safe_mysqld}, @code{mysql.server}, and @code{mysql_install_db} have -been modified to use @code{mysql_print_defaults} instead of various hacks -to read the @file{my.cnf} files. In addition, the handling of various -paths has been made more consistent with how @code{mysqld} handles them -by default. -@item -Automatically remove Berkeley DB transaction logs that no longer are in -use. -@item -Fixed bug with several @code{FULLTEXT} indexes in one table. -@item -Added a warning if number of rows changes on @code{REPAIR}/@code{OPTIMIZE}. -@item -Applied patches for OS/2 by @code{Yuri Dario}. -@item -@code{FLUSH TABLES tbl_name} didn't always flush the index tree -to disk properly. -@item -@code{--bootstrap} is now run in a separate thread. This fixes a problem -that caused @code{mysql_install_db} to core dump on some Linux machines. -@item -Changed @code{mi_create()} to use less stack space. -@item -Fixed bug with optimiser trying to over-optimise @code{MATCH()} when used -with @code{UNIQUE} key. -@item -Changed @code{crash-me} and the MySQL benchmarks to also work -with FrontBase. -@item -Allow @code{RESTRICT} and @code{CASCADE} after @code{DROP TABLE} to make -porting easier. -@item -Reset status variable which could cause problem if one used @code{--slow-log}. -@item -Added @code{connect_timeout} variable to @code{mysql} and @code{mysqladmin}. -@item -Added @code{connect-timeout} as an alias for @code{timeout} for option files -read by @code{mysql_options()}. -@end itemize - - -@node News-3.23.28, News-3.23.27, News-3.23.29, News-3.23.x -@appendixsubsec Changes in release 3.23.28 (22 Nov 2000: Gamma) - -@itemize @bullet -@item -Added new options @code{--pager[=...]}, @code{--no-pager}, -@code{--tee=...} and @code{--no-tee} to the @code{mysql} client. The -new corresponding interactive commands are @code{pager}, @code{nopager}, -@code{tee} and @code{notee}. @xref{mysql, , @code{mysql}}, @code{mysql --help} -and the interactive help for more information. -@item -Fixed crash when automatic repair of @code{MyISAM} table failed. -@item -Fixed a major performance bug in the table locking code when one -constantly had a lot of @code{SELECT}, @code{UPDATE} and @code{INSERT} -statements running. The symptom was that the @code{UPDATE} and -@code{INSERT} queries were locked for a long time while new @code{SELECT} -statements were executed before the updates. -@item -When reading @code{options_files} with @code{mysql_options()} the -@code{return-found-rows} option was ignored. -@item -One can now specify @code{interactive-timeout} in the option file that -is read by @code{mysql_options()}. This makes it possible to force -programs that run for a long time (like @code{mysqlhotcopy}) to use the -@code{interactive_timeout} time instead of the @code{wait_timeout} time. -@item -Added to the slow query log the time and the user name for each logged -query. If you are using @code{--log-long-format} then also queries that -do not use an index are logged, even if the query takes less than -@code{long_query_time} seconds. -@item -Fixed a problem in @code{LEFT JOIN} which caused all columns in a reference -table to be @code{NULL}. -@item -Fixed a problem when using @code{NATURAL JOIN} without keys. -@item -Fixed a bug when using a multi-part keys where the first part was of type -@code{TEXT} or @code{BLOB}. -@item -@code{DROP} of temporary tables wasn't stored in the update/binary log. -@item -Fixed a bug where @code{SELECT DISTINCT * ... LIMIT #} only returned one row. -@item -Fixed a bug in the assembler code in @code{strstr()} for SPARC and cleaned up -the @file{global.h} header file to avoid a problem with bad aliasing with -the compiler submitted with RedHat 7.0. (Reported by Trond Eivind Glomsrød) -@item -The @code{--skip-networking} option now works properly on NT. -@item -Fixed a long outstanding bug in the @code{ISAM} tables when a row with a length -of more than 65K was shortened by a single byte. -@item -Fixed a bug in @code{MyISAM} when running multiple updating processes on -the same table. -@item -Allow one to use @code{FLUSH TABLE tbl_name}. -@item -Added @code{--replicate-ignore-table}, @code{--replicate-do-table}, -@code{--replicate-wild-ignore-table}, and @code{--replicate-wild-do-table} -options to @code{mysqld}. -@item -Changed all log files to use our own @code{IO_CACHE} mechanism instead of -@code{FILE} to avoid OS problems when there are many files open. -@item -Added @code{--open-files} and @code{--timezone} options to @code{safe_mysqld}. -@item -Fixed a fatal bug in @code{CREATE TEMPORARY TABLE ... SELECT ...}. -@item -Fixed a problem with @code{CREATE TABLE ... SELECT NULL}. -@item -Added variables @code{large_file_support},@code{net_read_timeout}, -@code{net_write_timeout} and @code{query_buffer_size} to @code{SHOW VARIABLES}. -@item -Added status variables @code{created_tmp_files} and @code{sort_merge_passes} -to @code{SHOW STATUS}. -@item -Fixed a bug where we didn't allow an index name after the -@code{FOREIGN KEY} definition. -@item -Added @code{TRUNCATE table_name} as a synonym for -@code{DELETE FROM table_name}. -@item -Fixed a bug in a @code{BDB} key compare function when comparing part keys. -@item -Added @code{bdb_lock_max} variable to @code{mysqld}. -@item -Added more tests to the benchmark suite. -@item -Fixed an overflow bug in the client code when using overly long database names. -@item -@code{mysql_connect()} now aborts on Linux if the server doesn't answer in -@code{timeout} seconds. -@item -@code{SLAVE START} did not work if you started with -@code{--skip-slave-start} and had not explicitly run @code{CHANGE MASTER TO}. -@item -Fixed the output of @code{SHOW MASTER STATUS} to be consistent with -@code{SHOW SLAVE STATUS}. (It now has no directory in the log name.) -@item -Added @code{PURGE MASTER LOGS TO}. -@item -Added @code{SHOW MASTER LOGS}. -@item -Added @code{--safemalloc-mem-limit} option to @code{mysqld} to simulate memory -shortage when compiled with the @code{--with-debug=full} option. -@item -Fixed several core dumps in out-of-memory conditions. -@item -@code{SHOW SLAVE STATUS} was using an uninitialised mutex if the slave had -not been started yet. -@item -Fixed bug in @code{ELT()} and @code{MAKE_SET()} when the query used -a temporary table. -@item -@code{CHANGE MASTER TO} without specifying @code{MASTER_LOG_POS} would -set it to 0 instead of 4 and hit the magic number in the master binlog. -@item -@code{ALTER TABLE ... ORDER BY ...} syntax added. This will create the -new table with the rows in a specific order. -@end itemize - - -@node News-3.23.27, News-3.23.26, News-3.23.28, News-3.23.x -@appendixsubsec Changes in release 3.23.27 (24 Oct 2000) - -@itemize @bullet -@item -Fixed a bug where the automatic repair of @code{MyISAM} tables sometimes failed -when the datafile was corrupt. -@item -Fixed a bug in @code{SHOW CREATE} when using @code{AUTO_INCREMENT} columns. -@item -Changed @code{BDB} tables to use new compare function in Berkeley DB 3.2.3. -@item -You can now use Unix sockets with MIT-pthreads. -@item -Added the @code{latin5} (turkish) character set. -@item -Small portability fixes. -@end itemize - - -@node News-3.23.26, News-3.23.25, News-3.23.27, News-3.23.x -@appendixsubsec Changes in release 3.23.26 (18 Oct 2000) - -@itemize @bullet -@item -Renamed @code{FLUSH MASTER} and @code{FLUSH SLAVE} to @code{RESET MASTER} -and @code{RESET SLAVE}. -@item -Fixed @code{<>} to work properly with @code{NULL}. -@item -Fixed a problem with @code{SUBSTRING_INDEX()} and @code{REPLACE()}. -(Patch by Alexander Igonitchev) -@item -Fix @code{CREATE TEMPORARY TABLE IF NOT EXISTS} not to produce an error -if the table exists. -@item -If you don't create a @code{PRIMARY KEY} in a @code{BDB} table, a hidden -@code{PRIMARY KEY} will be created. -@item -Added read-only-key optimisation to @code{BDB} tables. -@item -@code{LEFT JOIN} in some cases preferred a full table scan when there was -no @code{WHERE} clause. -@item -When using @code{--log-slow-queries}, don't count the time waiting for a lock. -@item -Fixed bug in lock code on Windows which could cause the key cache -to report that the key file was crashed even if it was okay. -@item -Automatic repair of @code{MyISAM} tables if you start @code{mysqld} with -@code{--myisam-recover}. -@item -Removed the @code{TYPE=} keyword from @code{CHECK} and -@code{REPAIR}. Allow @code{CHECK} options to be combined. (You can still -use @code{TYPE=}, but this usage is deprecated.) -@item -Fixed mutex bug in the binary replication log -- long update queries could -be read only in part by the slave if it did it at the wrong time, which -was not fatal, but resulted in a performance-degrading reconnect and -a scary message in the error log. -@item -Changed the format of the binary log -- added magic number, server -version, binlog version. Added server id and query error code for each -query event. -@item -Replication thread from the slave now will kill all the stale threads -from the same server. -@item -Long replication user names were not being handled properly. -@item -Added @code{--replicate-rewrite-db} option to @code{mysqld}. -@item -Added @code{--skip-slave-start} option to @code{mysqld}. -@item -Updates that generated an error code (such as @code{INSERT INTO foo(some_key) -values (1),(1)}) erroneously terminated the slave thread. -@item -Added optimisation of queries where @code{DISTINCT} is only used on columns -from some of the tables. -@item -Allow floating-point numbers where there is no sign after the exponent -(like @code{1e1}). -@item -@code{SHOW GRANTS} didn't always show all column grants. -@item -Added @code{--default-extra-file=#} option to all MySQL clients. -@item -Columns referenced in @code{INSERT} statements now are initialised properly. -@item -@code{UPDATE} didn't always work when used with a range on a timestamp that -was part of the key that was used to find rows. -@item -Fixed a bug in @code{FULLTEXT} index when inserting a @code{NULL} column. -@item -Changed to use @code{mkstemp()} instead of @code{tempnam()}. Based -on a patch from John Jones. -@end itemize - - -@node News-3.23.25, News-3.23.24, News-3.23.26, News-3.23.x -@appendixsubsec Changes in release 3.23.25 (29 Sep 2000) - -@itemize @bullet -@item -Fixed that @code{databasename} works as second argument to @code{mysqlhotcopy}. -@item -The values for the @code{UMASK} and @code{UMASK_DIR} environment variables -now can be specified in octal by beginning the value with a zero. -@item -Added @code{RIGHT JOIN}. This makes @code{RIGHT} a reserved word. -@item -Added @code{@@@@IDENTITY} as a synonym for @code{LAST_INSERT_ID()}. -(This is for MSSQL compatibility.) -@item -Fixed a bug in @code{myisamchk} and @code{REPAIR} when using @code{FULLTEXT} -index. -@item -@code{LOAD DATA INFILE} now works with FIFOs. -(Patch by Toni L. Harbaugh-Blackford.) -@item -@code{FLUSH LOGS} broke replication if you specified a log name with an -explicit extension as the value of the @code{log-bin} option. -@item -Fixed a bug in @code{MyISAM} with packed multi-part keys. -@item -Fixed crash when using @code{CHECK TABLE} on Windows. -@item -Fixed a bug where @code{FULLTEXT} index always used the @code{koi8_ukr} -character set. -@item -Fixed privilege checking for @code{CHECK TABLE}. -@item -The @code{MyISAM} repair/reindex code didn't use the @code{--tmpdir} -option for its temporary files. -@item -Added @code{BACKUP TABLE} and @code{RESTORE TABLE}. -@item -Fixed core dump on @code{CHANGE MASTER TO} when the slave did not have -the master to start with. -@item -Fixed incorrect @code{Time} in the processlist for @code{Connect} of -the slave thread. -@item -The slave now logs when it connects to the master. -@item -Fixed a core dump bug when doing @code{FLUSH MASTER} if you didn't specify -a filename argument to @code{--log-bin}. -@item -Added missing @file{ha_berkeley.x} files to the MySQL Windows distribution. -@item -Fixed some mutex bugs in the log code that could cause thread blocks if new -log files couldn't be created. -@item -Added lock time and number of selected processed rows to slow query log. -@item -Added @code{--memlock} option to @code{mysqld} to lock @code{mysqld} -in memory on systems with the @code{mlockall()} call (like in Solaris). -@item -@code{HEAP} tables didn't use keys properly. (Bug from 3.23.23.) -@item -Added better support for @code{MERGE} tables (keys, mapping, creation, -documentation...). @xref{MERGE, , @code{MERGE}}. -@item -Fixed bug in @code{mysqldump} from 3.23 which caused some @code{CHAR} columns -not to be quoted. -@item -Merged @code{analyze}, @code{check}, @code{optimize} and repair code. -@item -@code{OPTIMIZE TABLE} is now mapped to @code{REPAIR} with statistics and -sorting of the index tree. This means that for the moment it only -works on @code{MyISAM} tables. -@item -Added a pre-alloced block to root_malloc to get fewer mallocs. -@item -Added a lot of new statistics variables. -@item -Fixed @code{ORDER BY} bug with @code{BDB} tables. -@item -Removed warning that @code{mysqld} couldn't remove the @file{.pid} file -under Windows. -@item -Changed @code{--log-isam} to log @code{MyISAM} tables instead of isam -tables. -@item -Fixed @code{CHECK TABLE} to work on Windows. -@item -Added file mutexes to make @code{pwrite()} safe on Windows. -@end itemize - - -@node News-3.23.24, News-3.23.23, News-3.23.25, News-3.23.x -@appendixsubsec Changes in release 3.23.24 (08 Sep 2000) - -@itemize @bullet -@item -Added @code{created_tmp_disk_tables} variable to @code{mysqld}. -@item -To make it possible to reliably dump and restore tables with -@code{TIMESTAMP(X)} columns, MySQL now reports columns with @code{X} -other than 14 or 8 to be strings. -@item -Changed sort order for @code{latin1} as it was before MySQL Version 3.23.23. -Any table that was created or modified with 3.23.22 must be repaired if it has -@code{CHAR} columns that may contain characters with ASCII values greater than -128! -@item -Fixed small memory leak introduced from 3.23.22 when creating a -temporary table. -@item -Fixed problem with @code{BDB} tables and reading on a unique (not primary) key. -@item -Restored the @code{win1251} character set (it's now only marked deprecated). -@end itemize - - -@node News-3.23.23, News-3.23.22, News-3.23.24, News-3.23.x -@appendixsubsec Changes in release 3.23.23 (01 Sep 2000) - -@itemize @bullet -@item -Changed sort order for 'German'; all tables created with 'German' sortorder -must be repaired with @code{REPAIR TABLE} or @code{myisamchk} before use! -@item -Added @code{--core-file} option to @code{mysqld} to get a core file on -Linux if @code{mysqld} dies on the @code{SIGSEGV} signal. -@item -MySQL client @code{mysql} now starts with option -@code{--no-named-commands} (@code{-g}) by default. This option can be -disabled with @code{--enable-named-commands} (@code{-G}). This may cause -incompatibility problems in some cases, for example, in SQL scripts that -use named commands without a semicolon, etc. ! Long format commands -still work from the first line. -@item -Fixed a problem when using many pending @code{DROP TABLE} statements at -the same time. -@item -Optimiser didn't use keys properly when using @code{LEFT JOIN} on an -empty table. -@item -Added shorter help text when invoking @code{mysqld} with incorrect options. -@item -Fixed non-fatal @code{free()} bug in @code{mysqlimport}. -@item -Fixed bug in @code{MyISAM} index handling of -@code{DECIMAL}/@code{NUMERIC} keys. -@item -Fixed a bug in concurrent insert in @code{MyISAM} tables. In some contexts, -usage of @code{MIN(key_part)} or @code{MAX(key_part)} returned an empty set. -@item -Updated @code{mysqlhotcopy} to use the new @code{FLUSH TABLES table_list} -syntax. Only tables which are being backed up are flushed now. -@item -Changed behaviour of @code{--enable-thread-safe-client} so -that both non-threaded (@code{-lmysqlclient}) and threaded -(@code{-lmysqlclient_r}) libraries are built. Users who linked -against a threaded @code{-lmysqlclient} will need to link against -@code{-lmysqlclient_r} now. -@item -Added atomic @code{RENAME TABLE} command. -@item -Don't count @code{NULL} values in @code{COUNT(DISTINCT ...)}. -@item -Changed @code{ALTER TABLE}, @code{LOAD DATA INFILE} on empty tables and -@code{INSERT ... SELECT ...} on empty tables to create non-unique indexes -in a separate batch with sorting. This will make the above calls much -faster when you have many indexes. -@item -@code{ALTER TABLE} now logs the first used insert_id correctly. -@item -Fixed crash when adding a default value to a @code{BLOB} column. -@item -Fixed a bug with @code{DATE_ADD/DATE_SUB} where it returned a datetime instead -of a date. -@item -Fixed a problem with the thread cache which made some threads show up as -@code{***DEAD***} in @code{SHOW PROCESSLIST}. -@item -Fixed a lock in our thr_rwlock code, which could make selects that run -at the same time as concurrent inserts crash. This only affects systems -that don't have the @code{pthread_rwlock_rdlock} code. -@item -When deleting rows with a non-unique key in a @code{HEAP} table, all rows -weren't always deleted. -@item -Fixed bug in range optimiser for @code{HEAP} tables for searches on a part -index. -@item -Fixed @code{SELECT} on part keys to work with @code{BDB} tables. -@item -Fixed @code{INSERT INTO bdb_table ... SELECT} to work with @code{BDB} tables. -@item -@code{CHECK TABLE} now updates key statistics for the table. -@item -@code{ANALYZE TABLE} will now only update tables that have been changed -since the last @code{ANALYZE}. Note that this is a new feature and tables -will not be marked to be analysed until they are updated in any way with -3.23.23 or newer. For older tables, you have to do @code{CHECK TABLE} -to update the key distribution. -@item -Fixed some minor privilege problems with @code{CHECK}, @code{ANALYZE}, -@code{REPAIR} and @code{SHOW CREATE} commands. -@item -Added @code{CHANGE MASTER TO} statement. -@item -Added @code{FAST}, @code{QUICK} @code{EXTENDED} check types to -@code{CHECK TABLES}. -@item -Changed @code{myisamchk} so that @code{--fast} and -@code{--check-only-changed} are also honored with @code{--sort-index} and -@code{--analyze}. -@item -Fixed fatal bug in @code{LOAD TABLE FROM MASTER} that did not lock the -table during index re-build. -@item -@code{LOAD DATA INFILE} broke replication if the database was excluded -from replication. -@item -More variables in @code{SHOW SLAVE STATUS} and @code{SHOW MASTER STATUS}. -@item -@code{SLAVE STOP} now will not return until the slave thread actually exits. -@item -Full-text search via the @code{MATCH()} function and @code{FULLTEXT} index type -(for @code{MyISAM} files). This makes @code{FULLTEXT} a reserved word. -@end itemize - - -@node News-3.23.22, News-3.23.21, News-3.23.23, News-3.23.x -@appendixsubsec Changes in release 3.23.22 (31 Jul 2000) - -@itemize @bullet -@item -Fixed that @code{lex_hash.h} is created properly for each MySQL -distribution. -@item -Fixed that @code{MASTER} and @code{COLLECTION} are not reserved words. -@item -The log generated by @code{--slow-query-log} didn't contain the whole queries. -@item -Fixed that open transactions in @code{BDB} tables are rolled back if the -connection is closed unexpectedly. -@item -Added workaround for a bug in @code{gcc} 2.96 (intel) and @code{gcc} 2.9 -(IA64) in @code{gen_lex_hash.c}. -@item -Fixed memory leak in the client library when using @code{host=} in the -@file{my.cnf} file. -@item -Optimised functions that manipulate the hours/minutes/seconds. -@item -Fixed bug when comparing the result of @code{DATE_ADD()}/@code{DATE_SUB()} -against a number. -@item -Changed the meaning of @code{-F, --fast} for @code{myisamchk}. Added -@code{-C, --check-only-changed} option to @code{myisamchk}. -@item -Added @code{ANALYZE tbl_name} to update key statistics for tables. -@item -Changed binary items @code{0x...} to be regarded as integers by default. -@item -Fix for SCO and @code{SHOW PROCESSLIST}. -@item -Added @code{auto-rehash} on reconnect for the @code{mysql} client. -@item -Fixed a newly introduced bug in @code{MyISAM}, where the index file couldn't -get bigger than 64M. -@item -Added @code{SHOW MASTER STATUS} and @code{SHOW SLAVE STATUS}. -@end itemize - - -@node News-3.23.21, News-3.23.20, News-3.23.22, News-3.23.x -@appendixsubsec Changes in release 3.23.21 - -@itemize @bullet -@item -Added @code{mysql_character_set_name()} function to the -MySQL C API. -@item -Made the update log ASCII 0 safe. -@item -Added the @code{mysql_config} script. -@item -Fixed problem when using @code{<} or @code{>} with a char column that was only -partly indexed. -@item -One would get a core dump if the log file was not readable by the MySQL user. -@item -Changed @code{mysqladmin} to use @code{CREATE DATABASE} and @code{DROP -DATABASE} statements instead of the old deprecated API calls. -@item -Fixed @code{chown} warning in @code{safe_mysqld}. -@item -Fixed a bug in @code{ORDER BY} that was introduced in 3.23.19. -@item -Only optimise the @code{DELETE FROM tbl_name} to do a drop+create of -the table if we are in @code{AUTOCOMMIT} mode (needed for @code{BDB} tables). -@item -Added extra checks to avoid index corruption when the @code{ISAM}/@code{MyISAM} -index files get full during an @code{INSERT}/@code{UPDATE}. -@item -@code{myisamchk} didn't correctly update row checksum when used with -@code{-ro} (this only gave a warning in subsequent runs). -@item -Fixed bug in @code{REPAIR TABLE} so that it works with tables without indexes. -@item -Fixed buffer overrun in @code{DROP DATABASE}. -@item -@code{LOAD TABLE FROM MASTER} is sufficiently bug-free to announce it as -a feature. -@item -@code{MATCH} and @code{AGAINST} are now reserved words. -@end itemize - - -@node News-3.23.20, News-3.23.19, News-3.23.21, News-3.23.x -@appendixsubsec Changes in release 3.23.20 - -@itemize @bullet -@item -Fixed bug in 3.23.19; @code{DELETE FROM tbl_name} removed the @file{.frm} file. -@item -Added @code{SHOW CREATE TABLE}. -@end itemize - - -@node News-3.23.19, News-3.23.18, News-3.23.20, News-3.23.x -@appendixsubsec Changes in release 3.23.19 - -@itemize @bullet -@item -Changed copyright for all files to GPL for the server code and utilities and -to LGPL for the client libraries. -@item -Fixed bug where all rows matching weren't updated on a @code{MyISAM} table -when doing update based on key on a table with many keys and some key changed -values. -@item -The Linux MySQL RPM's and binaries are now statically linked with -a linuxthread version that has faster mutex handling when used with -MySQL. -@item -@code{ORDER BY} can now use @code{REF} keys to find subsets of the rows -that need to be sorted. -@item -Changed name of @code{print_defaults} program to @code{my_print_defaults} -to avoid name confusion. -@item -Fixed @code{NULLIF()} to work according to ANSI SQL99. -@item -Added @code{net_read_timeout} and @code{net_write_timeout} as startup -parameters to @code{mysqld}. -@item -Fixed bug that destroyed index when doing @code{myisamchk --sort-records} -on a table with prefix compressed index. -@item -Added @code{pack_isam} and @code{myisampack} to the standard MySQL -distribution. -@item -Added the syntax @code{BEGIN WORK} (the same as @code{BEGIN}). -@item -Fixed core dump bug when using @code{ORDER BY} on a @code{CONV()} expression. -@item -Added @code{LOAD TABLE FROM MASTER}. -@item -Added @code{FLUSH MASTER} and @code{FLUSH SLAVE}. -@item -Fixed big/little endian problem in the replication. -@end itemize - - -@node News-3.23.18, News-3.23.17, News-3.23.19, News-3.23.x -@appendixsubsec Changes in release 3.23.18 - -@itemize @bullet -@item -Fixed a problem from 3.23.17 when choosing character set on the client side. -@item -Added @code{FLUSH TABLES WITH READ LOCK} to make a global lock suitable for -making a copy of MySQL datafiles. -@item -@code{CREATE TABLE ... SELECT ... PROCEDURE} now works. -@item -Internal temporary tables will now use compressed index when using -@code{GROUP BY} on @code{VARCHAR/CHAR} columns. -@item -Fixed a problem when locking the same table with both a @code{READ} and a -@code{WRITE} lock. -@item -Fixed problem with @code{myisamchk} and @code{RAID} tables. -@end itemize - - -@node News-3.23.17, News-3.23.16, News-3.23.18, News-3.23.x -@appendixsubsec Changes in release 3.23.17 - -@itemize @bullet -@item -Fixed a bug in @code{FIND_IN_SET()} when the first argument was @code{NULL}. -@item -Added table locks to Berkeley DB. -@item -Fixed a bug with @code{LEFT JOIN} and @code{ORDER BY} where the first -table had only one matching row. -@item -Added 4 sample @file{my.cnf} example files in the @file{support-files} -directory. -@item -Fixed @code{duplicated key} problem when doing big @code{GROUP BY} operations. -(This bug was probably introduced in 3.23.15.) -@item -Changed syntax for @code{INNER JOIN} to match ANSI SQL. -@item -Added @code{NATURAL JOIN} syntax. -@item -A lot of fixes in the @code{BDB} interface. -@item -Added handling of @code{--no-defaults} and @code{--defaults-file} to -@code{safe_mysqld.sh} and @code{mysql_install_db.sh}. -@item -Fixed bug in reading compressed tables with many threads. -@item -Fixed that @code{USE INDEX} works with @code{PRIMARY} keys. -@item -Added @code{BEGIN} statement to start a transaction in @code{AUTOCOMMIT} mode. -@item -Added support for symbolic links for Windows. -@item -Changed protocol to let client know if the server is in @code{AUTOCOMMIT} mode -and if there is a pending transaction. If there is a pending transaction, -the client library will give an error before reconnecting to the server to -let the client know that the server did a rollback. -The protocol is still backward-compatible with old clients. -@item -@code{KILL} now works on a thread that is locked on a 'write' to a dead client. -@item -Fixed memory leak in the replication slave thread. -@item -Added new @code{log-slave-updates} option to @code{mysqld}, to allow -daisy-chaining the slaves. -@item -Fixed compile error on FreeBSD and other systems where @code{pthread_t} -is not the same as @code{int}. -@item -Fixed master shutdown aborting the slave thread. -@item -Fixed a race condition in @code{INSERT DELAYED} code when doing -@code{ALTER TABLE}. -@item -Added deadlock detection sanity checks to @code{INSERT DELAYED}. -@end itemize - - -@node News-3.23.16, News-3.23.15, News-3.23.17, News-3.23.x -@appendixsubsec Changes in release 3.23.16 - -@itemize @bullet -@item -Added @code{SLAVE START} and @code{SLAVE STOP} statements. -@item -Added @code{TYPE=QUICK} option to @code{CHECK} and to @code{REPAIR}. -@item -Fixed bug in @code{REPAIR TABLE} when the table was in use by other threads. -@item -Added a thread cache to make it possible to debug MySQL with -@code{gdb} when one does a lot of reconnects. This will also improve -systems where you can't use persistent connections. -@item -Lots of fixes in the Berkeley DB interface. -@item -@code{UPDATE IGNORE} will not abort if an update results in a -@code{DUPLICATE_KEY} error. -@item -Put @code{CREATE TEMPORARY TABLE} commands in the update log. -@item -Fixed bug in handling of masked IP numbers in the privilege tables. -@item -Fixed bug with @code{delay_key_write} tables and @code{CHECK TABLE}. -@item -Added @code{replicate-do-db} and @code{replicate-ignore-db} options to -@code{mysqld}, to restrict which databases get replicated. -@item -Added @code{SQL_LOG_BIN} option. -@end itemize - - -@node News-3.23.15, News-3.23.14, News-3.23.16, News-3.23.x -@appendixsubsec Changes in release 3.23.15 (May 2000: Beta) - -@itemize @bullet -@item -To start @code{mysqld} as @code{root}, you must now use the @code{--user=root} option. -@item -Added interface to Berkeley DB. (This is not yet functional; play with it at -your own risk!) -@item -Replication between master and slaves. -@item -Fixed bug that other threads could steal a lock when a thread had -a lock on a table and did a @code{FLUSH TABLES} command. -@item -Added the @code{slow_launch_time} variable and the @code{Slow_launch_threads} -status variable to @code{mysqld}. These can be examined with -@code{mysqladmin variables} and @code{mysqladmin extended-status}. -@item -Added functions @code{INET_NTOA()} and @code{INET_ATON()}. -@item -The default type of @code{IF()} now depends on the second and -third arguments and not only on the second argument. -@item -Fixed case when @code{myisamchk} could go into a loop when trying to -repair a crashed table. -@item -Don't write @code{INSERT DELAYED} to update log if @code{SQL_LOG_UPDATE=0}. -@item -Fixed problem with @code{REPLACE} on @code{HEAP} tables. -@item -Added possible character sets and time zone to @code{SHOW VARIABLES} output. -@item -Fixed bug in locking code that could result in locking problems with -concurrent inserts under high load. -@item -Fixed a problem with @code{DELETE} of many rows on a table with -compressed keys where MySQL scanned the index to find the rows. -@item -Fixed problem with @code{CHECK} on table with deleted keyblocks. -@item -Fixed a bug in reconnect (at the client side) where it didn't free memory -properly in some contexts. -@item -Fixed problems in update log when using @code{LAST_INSERT_ID()} to update -a table with an @code{AUTO_INCREMENT} key. -@item -Added @code{NULLIF()} function. -@item -Fixed bug when using @code{LOAD DATA INFILE} on a table with -@code{BLOB/TEXT} columns. -@item -Optimised @code{MyISAM} to be faster when inserting keys in sorted order. -@item -@code{EXPLAIN SELECT ...} now also prints out whether MySQL needs to -create a temporary table or use file sorting when resolving the @code{SELECT}. -@item -Added optimisation to skip @code{ORDER BY} parts where the part is a -constant expression in the @code{WHERE} part. Indexes can now be used -even if the @code{ORDER BY} doesn't match the index exactly, as long as -all the unused index parts and all the extra @code{ORDER BY} -columns are constants in the @code{WHERE} clause. @xref{MySQL indexes}. -@item -@code{UPDATE} and @code{DELETE} on a whole unique key in the @code{WHERE} part -are now faster than before. -@item -Changed @code{RAID_CHUNKSIZE} to be in 1024-byte increments. -@item -Fixed core dump in @code{LOAD_FILE(NULL)}. -@end itemize - - -@node News-3.23.14, News-3.23.13, News-3.23.15, News-3.23.x -@appendixsubsec Changes in release 3.23.14 - -@itemize @bullet -@item -Added @code{mysql_real_escape_string()} function to the MySQL C API. -@item -Fixed a bug in @code{CONCAT()} where one of the arguments was a function -that returned a modified argument. -@item -Fixed a critical bug in @code{myisamchk}, where it updated the header in -the index file when one only checked the table. This confused the -@code{mysqld} daemon if it updated the same table at the same time. Now -the status in the index file is only updated if one uses -@code{--update-state}. With older @code{myisamchk} versions you should -use @code{--read-only} when only checking tables, if there is the -slightest chance that the @code{mysqld} server is working on the table at the -same time! -@item -Fixed that @code{DROP TABLE} is logged in the update log. -@item -Fixed problem when searching on @code{DECIMAL()} key field -where the column data contained leading zeros. -@item -Fix bug in @code{myisamchk} when the @code{AUTO_INCREMENT} column isn't -the first key. -@item -Allow @code{DATETIME} in ISO8601 format: 2000-03-12T12:00:00 -@item -Dynamic character sets. A @code{mysqld} binary can now handle many different -character sets (you can choose which when starting @code{mysqld}). -@item -Added command @code{REPAIR TABLE}. -@item -Added @code{mysql_thread_safe()} function to the MySQL C API. -@item -Added the @code{UMASK_DIR} environment variable. -@item -Added @code{CONNECTION_ID()} function to return the client connection thread -ID. -@item -When using @code{=} on @code{BLOB} or @code{VARCHAR BINARY} keys, where -only a part of the column was indexed, the whole column of the result -row wasn't compared. -@item -Fix for @code{sjis} character set and @code{ORDER BY}. -@item -When running in ANSI mode, don't allow columns to be used that aren't in -the @code{GROUP BY} part. -@end itemize - - -@node News-3.23.13, News-3.23.12, News-3.23.14, News-3.23.x -@appendixsubsec Changes in release 3.23.13 - -@itemize @bullet -@item -Fixed problem when doing locks on the same table more than 2 times in -the same @code{LOCK TABLE} command; this fixed the problem one got when running -the test-ATIS test with @code{--fast} or @code{--check-only-changed}. -@item -Added @code{SQL_BUFFER_RESULT} option to @code{SELECT}. -@item -Removed end space from double/float numbers in results from temporary -tables. -@item -Added @code{CHECK TABLE} command. -@item -Added changes for @code{MyISAM} in 3.23.12 that didn't get into the source -distribution because of CVS problems. -@item -Fixed bug so that @code{mysqladmin shutdown} will wait for the local server -to close down. -@item -Fixed a possible endless loop when calculating timestamp. -@item -Added @code{print_defaults} program to the @file{.rpm} files. Removed -@code{mysqlbug} from the client @file{.rpm} file. -@end itemize - - -@node News-3.23.12, News-3.23.11, News-3.23.13, News-3.23.x -@appendixsubsec Changes in release 3.23.12 (07 Mar 2000) - -@itemize @bullet -@item -Fixed bug in @code{MyISAM} involving @code{REPLACE ... SELECT ...} which could -give a corrupted table. -@item -Fixed bug in @code{myisamchk} where it incorrectly reset the -@code{AUTO_INCREMENT} value. -@item -LOTS of patches for Linux Alpha. MySQL now appears to be relatively -stable on Alpha. -@item -Changed @code{DISTINCT} on @code{HEAP} temporary tables to use hashed -keys to quickly find duplicated rows. This mostly concerns queries of -type @code{SELECT DISTINCT ... GROUP BY ...}. This fixes a problem where -not all duplicates were removed in queries of the above type. In -addition, the new code is MUCH faster. -@item -Added patches to make MySQL compile on Mac OS X. -@item -Added @code{IF NOT EXISTS} clause to @code{CREATE DATABASE}. -@item -Added @code{--all-databases} and @code{--databases} options to @code{mysqldump} -to allow dumping of many databases at the same time. -@item -Fixed bug in compressed @code{DECIMAL()} index in @code{MyISAM} tables. -@item -Fixed bug when storing 0 into a timestamp. -@item -When doing @code{mysqladmin shutdown} on a local connection, @code{mysqladmin} -now waits until the PID file is gone before terminating. -@item -Fixed core dump with some @code{COUNT(DISTINCT ...)} queries. -@item -Fixed that @code{myisamchk} works properly with RAID tables. -@item -Fixed problem with @code{LEFT JOIN} and @code{key_field IS NULL}. -@item -Fixed bug in @code{net_clear()} which could give the error @code{Aborted -connection} in the MySQL clients. -@item -Added options @code{USE INDEX (key_list)} and @code{IGNORE INDEX (key_list)} as -parameters in @code{SELECT}. -@item -@code{DELETE} and @code{RENAME} should now work on @code{RAID} tables. -@end itemize - - -@node News-3.23.11, News-3.23.10, News-3.23.12, News-3.23.x -@appendixsubsec Changes in release 3.23.11 - -@itemize @bullet -@item -Allow the @code{ALTER TABLE tbl_name ADD (field_list)} syntax. -@item -Fixed problem with optimiser that could sometimes use incorrect keys. -@item -Fixed that @code{GRANT/REVOKE ALL PRIVILEGES} doesn't affect -@code{GRANT OPTION}. -@item -Removed extra @samp{)} from the output of @code{SHOW GRANTS}. -@item -Fixed problem when storing numbers in timestamps. -@item -Fix problem with timezones that have half hour offsets. -@item -Allow the syntax @code{UNIQUE INDEX} in @code{CREATE} statements. -@item -@code{mysqlhotcopy} - fast online hot-backup utility for local -MySQL databases. By Tim Bunce. -@item -New more secure @code{mysqlaccess}. Thanks to Steve Harvey for this. -@item -Added @code{--i-am-a-dummy} and @code{--safe-updates} options to @code{mysql}. -@item -Added @code{select_limit} and @code{max_join_size} variables to @code{mysql}. -@item -Added @code{SQL_MAX_JOIN_SIZE} and @code{SQL_SAFE_UPDATES} options. -@item -Added @code{READ LOCAL} lock that doesn't lock the table for concurrent -inserts. (This is used by @code{mysqldump}.) -@item -Changed that @code{LOCK TABLES ... READ} doesn't anymore allow concurrent -inserts. -@item -Added @code{--skip-delay-key-write} option to @code{mysqld}. -@item -Fixed security problem in the protocol regarding password checking. -@item -@code{_rowid} can now be used as an alias for an integer type unique indexed -column. -@item -Added back blocking of @code{SIGPIPE} when compiling with @code{--thread-safe-clients} -to make things safe for old clients. -@end itemize - - -@node News-3.23.10, News-3.23.9, News-3.23.11, News-3.23.x -@appendixsubsec Changes in release 3.23.10 - -@itemize @bullet -@item -Fixed bug in 3.23.9 where memory wasn't properly freed when using -@code{LOCK TABLES}. -@end itemize - - -@node News-3.23.9, News-3.23.8, News-3.23.10, News-3.23.x -@appendixsubsec Changes in release 3.23.9 - -@itemize @bullet -@item -Fixed problem that affected queries that did arithmetic on group functions. -@item -Fixed problem with timestamps and @code{INSERT DELAYED}. -@item -Fixed that @code{date_col BETWEEN const_date AND const_date} works. -@item -Fixed problem when only changing a 0 to @code{NULL} in a table with -@code{BLOB/TEXT} columns. -@item -Fixed bug in range optimiser when using many key parts and or on the middle -key parts: @code{WHERE K1=1 and K3=2 and (K2=2 and K4=4 or K2=3 and K4=5)} -@item -Added @code{source} command to @code{mysql} to allow reading of batch files -inside the @code{mysql} client. Original patch by Matthew Vanecek. -@item -Fixed critical problem with the @code{WITH GRANT OPTION} option. -@item -Don't give an unnecessary @code{GRANT} error when using tables from many -databases in the same query. -@item -Added VIO wrapper (needed for SSL support; by Andrei Errapart and -Tõnu Samuel). -@item -Fixed optimiser problem on @code{SELECT} when using many overlapping indexes. -MySQL should now be able to choose keys even better when there -are many keys to choose from. -@item -Changed optimiser to prefer a range key instead of a ref key when the -range key can uses more columns than the ref key (which only can use -columns with @code{=}). For example, the following type of queries should now -be faster: @code{SELECT * from key_part_1=const and key_part_2 > const2} -@item -Fixed bug that a change of all @code{VARCHAR} columns to @code{CHAR} columns -didn't change row type from dynamic to fixed. -@item -Disabled floating-point exceptions for FreeBSD to fix core dump when -doing @code{SELECT FLOOR(POW(2,63))}. -@item -Renamed @code{mysqld} startup option from @code{--delay-key-write} to -@code{--delay-key-write-for-all-tables}. -@item -Added @code{read-next-on-key} to @code{HEAP} tables. This should fix all -problems with @code{HEAP} tables when using non-@code{UNIQUE} keys. -@item -Added option to print default arguments to all clients. -@item -Added @code{--log-slow-queries} option to @code{mysqld} to log all queries -that take a long time to a separate log file with a time indicating how -long the query took. -@item -Fixed core dump when doing @code{WHERE key_col=RAND(...)}. -@item -Fixed optimisation bug in @code{SELECT ... LEFT JOIN ... key_col IS NULL}, -when @code{key_col} could contain @code{NULL} values. -@item -Fixed problem with 8-bit characters as separators in @code{LOAD DATA INFILE}. -@end itemize - - -@node News-3.23.8, News-3.23.7, News-3.23.9, News-3.23.x -@appendixsubsec Changes in release 3.23.8 (02 Jan 2000) - -@itemize @bullet -@item -Fixed problem when handling indexfiles larger than 8G. -@item -Added latest patches to MIT-pthreads for NetBSD. -@item -Fixed problem with timezones that are < GMT - 11. -@item -Fixed a bug when deleting packed keys in @code{NISAM}. -@item -Fixed problem with @code{ISAM} when doing some @code{ORDER BY ... DESC} queries. -@item -Fixed bug when doing a join on a text key which didn't cover the whole key. -@item -Option @code{--delay-key-write} didn't enable delayed key writing. -@item -Fixed update of @code{TEXT} column which involved only case changes. -@item -Fixed that @code{INSERT DELAYED} doesn't update timestamps that are given. -@item -Added function @code{YEARWEEK()} and options @code{x}, @code{X}, @code{v} and -@code{V} to @code{DATE_FORMAT()}. -@item -Fixed problem with @code{MAX(indexed_column)} and @code{HEAP} tables. -@item -Fixed problem with @code{BLOB NULL} keys and @code{LIKE "prefix%"}. -@item -Fixed problem with @code{MyISAM} and fixed-length rows < 5 bytes. -@item -Fixed problem that could cause MySQL to touch freed memory when -doing very complicated @code{GROUP BY} queries. -@item -Fixed core dump if you got a crashed table where an @code{ENUM} field value -was too big. -@end itemize - - -@node News-3.23.7, News-3.23.6, News-3.23.8, News-3.23.x -@appendixsubsec Changes in release 3.23.7 (10 Dec 1999) - -@itemize @bullet -@item -Fixed workaround under Linux to avoid problems with @code{pthread_mutex_timedwait}, -which is used with @code{INSERT DELAYED}. @xref{Linux}. -@item -Fixed that one will get a 'disk full' error message if one gets disk full -when doing sorting (instead of waiting until we got more disk space). -@item -Fixed a bug in @code{MyISAM} with keys > 250 characters. -@item -In @code{MyISAM} one can now do an @code{INSERT} at the same time as other -threads are reading from the table. -@item -Added @code{max_write_lock_count} variable to @code{mysqld} to force a -@code{READ} lock after a certain number of @code{WRITE} locks. -@item -Inverted flag @code{delay_key_write} on @code{show variables}. -@item -Renamed @code{concurrency} variable to @code{thread_concurrency}. -@item -The following functions are now multi-byte-safe: -@code{LOCATE(substr,str)}, @code{POSITION(substr IN str)}, -@code{LOCATE(substr,str,pos)}, @code{INSTR(str,substr)}, -@code{LEFT(str,len)}, @code{RIGHT(str,len)}, -@code{SUBSTRING(str,pos,len)}, @code{SUBSTRING(str FROM pos FOR len)}, -@code{MID(str,pos,len)}, @code{SUBSTRING(str,pos)}, @code{SUBSTRING(str -FROM pos)}, @code{SUBSTRING_INDEX(str,delim,count)}, @code{RTRIM(str)}, -@code{TRIM([[BOTH | TRAILING] [remstr] FROM] str)}, -@code{REPLACE(str,from_str,to_str)}, @code{REVERSE(str)}, -@code{INSERT(str,pos,len,newstr)}, @code{LCASE(str)}, @code{LOWER(str)}, -@code{UCASE(str)} and @code{UPPER(str)}; patch by Wei He. -@item -Fix core dump when releasing a lock from a non-existent table. -@item -Remove locks on tables before starting to remove duplicates. -@item -Added option @code{FULL} to @code{SHOW PROCESSLIST}. -@item -Added option @code{--verbose} to @code{mysqladmin}. -@item -Fixed problem when automatically converting @code{HEAP} to @code{MyISAM}. -@item -Fixed bug in @code{HEAP} tables when doing insert + delete + insert + scan the -table. -@item -Fixed bugs on Alpha with @code{REPLACE()} and @code{LOAD DATA INFILE}. -@item -Added @code{interactive_timeout} variable to @code{mysqld}. -@item -Changed the argument to @code{mysql_data_seek()} from @code{ulong} to -@code{ulonglong}. -@end itemize - - -@node News-3.23.6, News-3.23.5, News-3.23.7, News-3.23.x -@appendixsubsec Changes in release 3.23.6 - -@itemize @bullet -@item -Added @code{-O lower_case_table_names=@{0|1@}} option to @code{mysqld} to allow -users to force table names to lowercase. -@item -Added @code{SELECT ... INTO DUMPFILE}. -@item -Added @code{--ansi} option to @code{mysqld} to make some functions -ANSI SQL compatible. -@item -Temporary table names now start with @code{#sql}. -@item -Added quoting of identifiers with @code{`} (@code{"} in @code{--ansi} mode). -@item -Changed to use @code{snprintf()} when printing floats to avoid some buffer -overflows on FreeBSD. -@item -Made @code{FLOOR()} overflow safe on FreeBSD. -@item -Added @code{--quote-names} option to @code{mysqldump}. -@item -Fixed bug that one could make a part of a @code{PRIMARY KEY NOT NULL}. -@item -Fixed @code{encrypt()} to be thread-safe and not reuse buffer. -@item -Added @code{mysql_odbc_escape_string()} function to support big5 characters in -MyODBC. -@item -Rewrote the table handler to use classes. This introduces a lot of new code, -but will make table handling faster and better. -@item -Added patch by Sasha for user-defined variables. -@item -Changed that @code{FLOAT} and @code{DOUBLE} (without any length modifiers) -no longer are fixed decimal point numbers. -@item -Changed the meaning of @code{FLOAT(X)}: Now this is the same as @code{FLOAT} if -@code{X} <= 24 and a @code{DOUBLE} if 24 < @code{X} <= 53. -@item -@code{DECIMAL(X)} is now an alias for @code{DECIMAL(X,0)} and @code{DECIMAL} -is now an alias for @code{DECIMAL(10,0)}. The same goes for @code{NUMERIC}. -@item -Added option @code{ROW_FORMAT=@{default | dynamic | static | compressed@}} to -@code{CREATE_TABLE}. -@item -@code{DELETE FROM table_name} didn't work on temporary tables. -@item -Changed function @code{CHAR_LENGTH()} to be multi-byte character safe. -@item -Added function @code{ORD(string)}. -@end itemize - - -@node News-3.23.5, News-3.23.4, News-3.23.6, News-3.23.x -@appendixsubsec Changes in release 3.23.5 (20 Oct 1999) - -@itemize @bullet -@item -Fixed some Y2K problems in the new date handling in 3.23. -@item -Fixed problem with @code{SELECT DISTINCT ... ORDER BY RAND()}. -@item -Added patches by Sergei A. Golubchik for text searching on the @code{MyISAM} -level. -@item -Fixed cache overflow problem when using full joins without keys. -@item -Fixed some configure issues. -@item -Some small changes to make parsing faster. -@item -Adding a column after the last field with @code{ALTER TABLE} didn't work. -@item -Fixed problem when using an @code{AUTO_INCREMENT} column in two keys -@item -With @code{MyISAM}, you now can have an @code{AUTO_INCREMENT} column as a key -sub part: -@code{CREATE TABLE foo (a INT NOT NULL AUTO_INCREMENT, b CHAR(5), PRIMARY KEY (b,a))} -@item -Fixed bug in @code{MyISAM} with packed char keys that could be @code{NULL}. -@item -@code{AS} on field name with @code{CREATE TABLE table_name SELECT ...} didn't -work. -@item -Allow use of @code{NATIONAL} and @code{NCHAR} when defining character columns. -This is the same as not using @code{BINARY}. -@item -Don't allow @code{NULL} columns in a @code{PRIMARY KEY} (only in @code{UNIQUE} -keys). -@item -Clear @code{LAST_INSERT_ID()} if one uses this in ODBC: -@code{WHERE auto_increment_column IS NULL}. This seems to fix some problems -with Access. -@item -@code{SET SQL_AUTO_IS_NULL=0|1} now turns on/off the handling of -searching after the last inserted row with @code{WHERE -auto_increment_column IS NULL}. -@item -Added new variable @code{concurrency} to @code{mysqld} for Solaris. -@item -Added @code{--relative} option to @code{mysqladmin} to make -@code{extended-status} more useful to monitor changes. -@item -Fixed bug when using @code{COUNT(DISTINCT ...)} on an empty table. -@item -Added support for the Chinese character set GBK. -@item -Fixed problem with @code{LOAD DATA INFILE} and @code{BLOB} columns. -@item -Added bit operator @code{~} (negation). -@item -Fixed problem with @code{UDF} functions. -@end itemize - - -@node News-3.23.4, News-3.23.3, News-3.23.5, News-3.23.x -@appendixsubsec Changes in release 3.23.4 (28 Sep 1999) - -@itemize @bullet -@item -Inserting a @code{DATETIME} into a @code{TIME} column no longer will -try to store 'days' in it. -@item -Fixed problem with storage of float/double on little endian machines. -(This affected @code{SUM()}.) -@item -Added connect timeout on TCP/IP connections. -@item -Fixed problem with @code{LIKE "%"} on an index that may have @code{NULL} values. -@item -@code{REVOKE ALL PRIVILEGES} didn't revoke all privileges. -@item -Allow creation of temporary tables with same name as the original table. -@item -When granting a user a @code{GRANT} option for a database, he couldn't grant -privileges to other users. -@item -New command: @code{SHOW GRANTS FOR user} (by Sinisa). -@item -New @code{date_add} syntax: @code{date/datetime + INTERVAL # interval_type}. -By Joshua Chamas. -@item -Fixed privilege check for @code{LOAD DATA REPLACE}. -@item -Automatic fixing of broken include files on Solaris 2.7 -@item -Some configure issues to fix problems with big filesystem detection. -@item -@code{REGEXP} is now case-insensitive if you use non-binary strings. -@end itemize - - -@node News-3.23.3, News-3.23.2, News-3.23.4, News-3.23.x -@appendixsubsec Changes in release 3.23.3 - -@itemize @bullet -@item -Added patches for MIT-pthreads on NetBSD. -@item -Fixed range bug in @code{MyISAM}. -@item -@code{ASC} is now the default again for @code{ORDER BY}. -@item -Added @code{LIMIT} to @code{UPDATE}. -@item -Added @code{mysql_change_user()} function to the MySQL C API. -@item -Added character set to @code{SHOW VARIABLES}. -@item -Added support of @code{--[whitespace]} comments. -@item -Allow @code{INSERT into tbl_name VALUES ()}, that is, you may now specify -an empty value list to insert a row in which each column is set to its -default value. -@item -Changed @code{SUBSTRING(text FROM pos)} to conform to ANSI SQL. (Before this -construct returned the rightmost @code{pos} characters.) -@item -@code{SUM()} with @code{GROUP BY} returned 0 on some systems. -@item -Changed output for @code{SHOW TABLE STATUS}. -@item -Added @code{DELAY_KEY_WRITE} option to @code{CREATE TABLE}. -@item -Allow @code{AUTO_INCREMENT} on any key part. -@item -Fixed problem with @code{YEAR(NOW())} and @code{YEAR(CURDATE())}. -@item -Added @code{CASE} construct. -@item -New function @code{COALESCE()}. -@end itemize - - -@node News-3.23.2, News-3.23.1, News-3.23.3, News-3.23.x -@appendixsubsec Changes in release 3.23.2 (09 Aug 1999) - -@itemize @bullet -@item -Fixed range optimiser bug: @code{SELECT * FROM table_name WHERE -key_part1 >= const AND (key_part2 = const OR key_part2 = const)}. The -bug was that some rows could be duplicated in the result. -@item -Running @code{myisamchk} without @code{-a} updated the index -distribution incorrectly. -@item -@code{SET SQL_LOW_PRIORITY_UPDATES=1} was causing a parse error. -@item -You can now update index columns that are used in the @code{WHERE} clause. -@code{UPDATE tbl_name SET KEY=KEY+1 WHERE KEY > 100} -@item -Date handling should now be a bit faster. -@item -Added handling of fuzzy dates (dates where day or month is 0), such as -@code{'1999-01-00'}. -@item -Fixed optimisation of @code{SELECT ... WHERE key_part1=const1 AND -key_part_2=const2 AND key_part1=const4 AND key_part2=const4}; indextype -should be @code{range} instead of @code{ref}. -@item -Fixed @code{egcs} 1.1.2 optimiser bug (when using @code{BLOB}s) on Linux Alpha. -@item -Fixed problem with @code{LOCK TABLES} combined with @code{DELETE FROM table}. -@item -@code{MyISAM} tables now allow keys on @code{NULL} and @code{BLOB/TEXT} columns. -@item -The following join is now much faster: -@code{SELECT ... FROM t1 LEFT JOIN t2 ON ... WHERE t2.not_null_column IS NULL}. -@item -@code{ORDER BY} and @code{GROUP BY} can be done on functions. -@item -Changed handling of 'const_item' to allow handling of @code{ORDER BY RAND()}. -@item -Indexes are now used for @code{WHERE key_column = function}. -@item -Indexes are now used for @code{WHERE key_column = col_name} even if -the columns are not identically packed. -@item -Indexes are now used for @code{WHERE col_name IS NULL}. -@item -Changed heap tables to be stored in low_byte_first order (to make it easy -to convert to @code{MyISAM} tables) -@item -Automatic change of @code{HEAP} temporary tables to @code{MyISAM} tables -in case of 'table is full' errors. -@item -Added @code{--init-file=file_name} option to @code{mysqld}. -@item -Added @code{COUNT(DISTINCT value, [value, ...])}. -@item -@code{CREATE TEMPORARY TABLE} now creates a temporary table, in its own -namespace, that is automatically deleted if connection is dropped. -@item -New reserved words (required for @code{CASE}): @code{CASE, THEN, WHEN, ELSE and END}. -@item -New functions @code{EXPORT_SET()} and @code{MD5()}. -@item -Support for the GB2312 Chinese character set. -@end itemize - - -@node News-3.23.1, News-3.23.0, News-3.23.2, News-3.23.x -@appendixsubsec Changes in release 3.23.1 - -@itemize @bullet -@item -Fixed some compilation problems. -@end itemize - - -@node News-3.23.0, , News-3.23.1, News-3.23.x -@appendixsubsec Changes in release 3.23.0 (05 Aug 1999: Alpha) - -@itemize @bullet -@item -A new table handler library (@code{MyISAM}) with a lot of new features. -@xref{MyISAM, , @code{MyISAM}}. -@item -You can create in-memory @code{HEAP} tables which are extremely fast for -lookups. -@item -Support for big files (63-bit) on OSes that support big files. -@item -New function @code{LOAD_FILE(filename)} to get the contents of a file as a -string value. -@item -New operator @code{<=>} which will act as @code{=} but will return TRUE -if both arguments are @code{NULL}. This is useful for comparing changes -between tables. -@item -Added the ODBC 3.0 @code{EXTRACT(interval FROM datetime)} function. -@item -Columns defined as @code{FLOAT(X)} are not rounded on storage and may be -in scientific notation (1.0 E+10) when retrieved. -@item -@code{REPLACE} is now faster than before. -@item -Changed @code{LIKE} character comparison to behave as @code{=}; -This means that @code{'e' LIKE '@'e'} is now true. (If the line doesn't -display correctly, the latter 'e' is a French 'e' with a dot above.) -@item -@code{SHOW TABLE STATUS} returns a lot of information about the tables. -@item -Added @code{LIKE} to the @code{SHOW STATUS} command. -@item -Added @code{Privileges} column to @code{SHOW COLUMNS}. -@item -Added @code{Packed} and @code{Comment} columns to @code{SHOW INDEX}. -@item -Added comments to tables (with @code{CREATE TABLE ... COMMENT "xxx"}). -@item -Added @code{UNIQUE}, as in -@code{CREATE TABLE table_name (col int not null UNIQUE)} -@item -New create syntax: @code{CREATE TABLE table_name SELECT ...} -@item -New create syntax: @code{CREATE TABLE IF NOT EXISTS ...} -@item -Allow creation of @code{CHAR(0)} columns. -@item -@code{DATE_FORMAT()} now requires @samp{%} before any format character. -@item -@code{DELAYED} is now a reserved word (sorry about that :( ). -@item -An example procedure is added: @code{analyse}, file: @file{sql_analyse.c}. -This will describe the data in your query. Try the following: -@example -SELECT ... FROM ... -WHERE ... PROCEDURE ANALYSE([max elements,[max memory]]) -@end example - -This procedure is extremely useful when you want to check the data in your -table! -@item -@code{BINARY} cast to force a string to be compared in case-sensitive fashion. -@item -Added @code{--skip-show-database} option to @code{mysqld}. -@item -Check whether a row has changed in an @code{UPDATE} now also works -with @code{BLOB}/@code{TEXT} columns. -@item -Added the @code{INNER} join syntax. @strong{NOTE}: This made @code{INNER} -a reserved word! -@item -Added support for netmasks to the hostname in the MySQL grant tables. -You can specify a netmask using the @code{IP/NETMASK} syntax. -@item -If you compare a @code{NOT NULL DATE/DATETIME} column with @code{IS -NULL}, this is changed to a compare against @code{0} to satisfy some ODBC -applications. (By @email{shreeve@@uci.edu}.) -@item -@code{NULL IN (...)} now returns @code{NULL} instead of @code{0}. This will -ensure that @code{null_column NOT IN (...)} doesn't match -@code{NULL} values. -@item -Fix storage of floating-point values in @code{TIME} columns. -@item -Changed parsing of @code{TIME} strings to be more strict. Now the -fractional second part is detected (and currently skipped). The -following formats are supported: -@itemize -@item [[DAYS] [H]H:]MM:]SS[.fraction] -@item [[[[[H]H]H]H]MM]SS[.fraction] -@end itemize -@item -Detect (and ignore) fractional second part from @code{DATETIME}. -@item -Added the @code{LOW_PRIORITY} attribute to @code{LOAD DATA INFILE}. -@item -The default index name now uses the same case as the column name on which the -index name is based. -@item -Changed default number of connections to 100. -@item -Use bigger buffers when using @code{LOAD DATA INFILE}. -@item -@code{DECIMAL(x,y)} now works according to ANSI SQL. -@item -Added aggregate UDF functions. Thanks to Andreas F. Bobak -(@email{bobak@@relog.ch}) for this! -@item -@code{LAST_INSERT_ID()} is now updated for @code{INSERT INTO ... SELECT}. -@item -Some small changes to the join table optimiser to make some joins faster. -@item -@code{SELECT DISTINCT} is much faster; it uses the new @code{UNIQUE} -functionality in @code{MyISAM}. One difference compared to MySQL Version 3.22 -is that the output of @code{DISTINCT} is not sorted anymore. -@item -All C client API macros are now functions to make shared libraries more -reliable. Because of this, you can no longer call @code{mysql_num_fields()} on -a @code{MYSQL} object, you must use @code{mysql_field_count()} instead. -@item -Added use of @code{LIBWRAP}; patch by Henning P. Schmiedehausen. -@item -Don't allow @code{AUTO_INCREMENT} for other than numerical columns. -@item -Using @code{AUTO_INCREMENT} will now automatically make the column -@code{NOT NULL}. -@item -Show @code{NULL} as the default value for @code{AUTO_INCREMENT} columns. -@item -Added @code{SQL_BIG_RESULT}; @code{SQL_SMALL_RESULT} is now default. -@item -Added a shared library RPM. This enhancement was contributed by David -Fox (@email{dsfox@@cogsci.ucsd.edu}). -@item -Added @code{--enable-large-files} and @code{--disable-large-files} switches -to @code{configure}. See @file{configure.in} for some systems where this is -automatically turned off because of broken implementations. -@item -Upgraded @code{readline} to 4.0. -@item -New @code{CREATE TABLE} options: @code{PACK_KEYS} and @code{CHECKSUM}. -@item -Added @code{--default-table-type} option to @code{mysqld}. -@end itemize - - -@node News-3.22.x, News-3.21.x, News-3.23.x, News -@appendixsec Changes in release 3.22.x (Older; still supported) - -@cindex changes, version 3.22 - -The 3.22 version has faster and safer connect code than version 3.21, as well -as a lot of new nice enhancements. -As there aren't really any major changes, upgrading from 3.21 to 3.22 should -be very easy and painless. @xref{Upgrading-from-3.21}. - -@menu -* News-3.22.35:: Changes in release 3.22.35 -* News-3.22.34:: Changes in release 3.22.34 -* News-3.22.33:: Changes in release 3.22.33 -* News-3.22.32:: Changes in release 3.22.32 (14 Feb 2000) -* News-3.22.31:: Changes in release 3.22.31 -* News-3.22.30:: Changes in release 3.22.30 -* News-3.22.29:: Changes in release 3.22.29 (02 Jan 2000) -* News-3.22.28:: Changes in release 3.22.28 (20 Oct 1999) -* News-3.22.27:: Changes in release 3.22.27 -* News-3.22.26:: Changes in release 3.22.26 (16 Sep 1999) -* News-3.22.25:: Changes in release 3.22.25 -* News-3.22.24:: Changes in release 3.22.24 (05 Jul 1999) -* News-3.22.23:: Changes in release 3.22.23 (08 Jun 1999) -* News-3.22.22:: Changes in release 3.22.22 (30 Apr 1999) -* News-3.22.21:: Changes in release 3.22.21 -* News-3.22.20:: Changes in release 3.22.20 (18 Mar 1999) -* News-3.22.19:: Changes in release 3.22.19 (Mar 1999: Stable) -* News-3.22.18:: Changes in release 3.22.18 -* News-3.22.17:: Changes in release 3.22.17 -* News-3.22.16:: Changes in release 3.22.16 (Feb 1999: Gamma) -* News-3.22.15:: Changes in release 3.22.15 -* News-3.22.14:: Changes in release 3.22.14 -* News-3.22.13:: Changes in release 3.22.13 -* News-3.22.12:: Changes in release 3.22.12 -* News-3.22.11:: Changes in release 3.22.11 -* News-3.22.10:: Changes in release 3.22.10 -* News-3.22.9:: Changes in release 3.22.9 -* News-3.22.8:: Changes in release 3.22.8 -* News-3.22.7:: Changes in release 3.22.7 (Sep 1998: Beta) -* News-3.22.6:: Changes in release 3.22.6 -* News-3.22.5:: Changes in release 3.22.5 -* News-3.22.4:: Changes in release 3.22.4 -* News-3.22.3:: Changes in release 3.22.3 -* News-3.22.2:: Changes in release 3.22.2 -* News-3.22.1:: Changes in release 3.22.1 (Jun 1998: Alpha) -* News-3.22.0:: Changes in release 3.22.0 -@end menu - - -@node News-3.22.35, News-3.22.34, News-3.22.x, News-3.22.x -@appendixsubsec Changes in release 3.22.35 - -@itemize @bullet -@item -Fixed problem with @code{STD()}. -@item -Merged changes from the newest @code{ISAM} library from 3.23. -@item -Fixed problem with @code{INSERT DELAYED}. -@item -Fixed a bug core dump when using a @code{LEFT JOIN}/@code{STRAIGHT_JOIN} -on a table with only one row. -@end itemize - - -@node News-3.22.34, News-3.22.33, News-3.22.35, News-3.22.x -@appendixsubsec Changes in release 3.22.34 - -@itemize @bullet -@item -Fixed problem with @code{GROUP BY} on @code{TINYBLOB} columns; this -caused bugzilla to not show rows in some queries. -@item -Had to do total recompile of the Windows binary version as VC++ didn't -compile all relevant files for 3.22.33 :( -@end itemize - - -@node News-3.22.33, News-3.22.32, News-3.22.34, News-3.22.x -@appendixsubsec Changes in release 3.22.33 - -@itemize @bullet -@item -Fixed problems in Windows when locking tables with @code{LOCK TABLE}. -@item -Quicker kill of @code{SELECT DISTINCT} queries. -@end itemize - - -@node News-3.22.32, News-3.22.31, News-3.22.33, News-3.22.x -@appendixsubsec Changes in release 3.22.32 (14 Feb 2000) - -@itemize @bullet -@item -Fixed problem when storing numbers in timestamps. -@item -Fix problem with timezones that have half hour offsets. -@item -Added @code{mysqlhotcopy}, a fast online hot-backup utility for local MySQL -databases. By Tim Bunce. -@item -New more secure @code{mysqlaccess}. Thanks to Steve Harvey for this. -@item -Fixed security problem in the protocol regarding password checking. -@item -Fixed problem that affected queries that did arithmetic on @code{GROUP} functions. -@item -Fixed a bug in the @code{ISAM} code when deleting rows on tables with -packed indexes. -@end itemize - - -@node News-3.22.31, News-3.22.30, News-3.22.32, News-3.22.x -@appendixsubsec Changes in release 3.22.31 - -@itemize @bullet -@item -A few small fixes for the Windows version. -@end itemize - - -@node News-3.22.30, News-3.22.29, News-3.22.31, News-3.22.x -@appendixsubsec Changes in release 3.22.30 - -@itemize @bullet -@item -Fixed optimiser problem on @code{SELECT} when using many overlapping indexes. -@item -Disabled floating-point exceptions for FreeBSD to fix core dump when -doing @code{SELECT FLOOR(POW(2,63))}. -@item -Added print of default arguments options to all clients. -@item -Fixed critical problem with the @code{WITH GRANT OPTION} option. -@item -Fixed non-critical Y2K problem when writing short date to log files. -@end itemize - - -@node News-3.22.29, News-3.22.28, News-3.22.30, News-3.22.x -@appendixsubsec Changes in release 3.22.29 (02 Jan 2000) - -@itemize @bullet -@item -Upgraded the configure and include files to match the latest 3.23 version. -This should increase portability and make it easier to build shared libraries. -@item -Added latest patches to MIT-pthreads for NetBSD. -@item -Fixed problem with timezones that are < GMT -11. -@item -Fixed a bug when deleting packed keys in NISAM. -@item -Fixed problem that could cause MySQL to touch freed memory when -doing very complicated @code{GROUP BY} queries. -@item -Fixed core dump if you got a crashed table where an @code{ENUM} field value -was too big. -@item -Added @code{mysqlshutdown.exe} and @code{mysqlwatch.exe} to the Windows -distribution. -@item -Fixed problem when doing @code{ORDER BY} on a reference key. -@item -Fixed that @code{INSERT DELAYED} doesn't update timestamps that are given. -@end itemize - - -@node News-3.22.28, News-3.22.27, News-3.22.29, News-3.22.x -@appendixsubsec Changes in release 3.22.28 (20 Oct 1999) - -@itemize @bullet -@item -Fixed problem with @code{LEFT JOIN} and @code{COUNT()} on a column which -was declared @code{NULL} + and it had a @code{DEFAULT} value. -@item -Fixed core dump problem when using @code{CONCAT()} in a @code{WHERE} clause. -@item -Fixed problem with @code{AVG()} and @code{STD()} with @code{NULL} values. -@end itemize - - -@node News-3.22.27, News-3.22.26, News-3.22.28, News-3.22.x -@appendixsubsec Changes in release 3.22.27 - -@itemize @bullet -@item -Fixed prototype in @file{my_ctype.h} when using other character sets. -@item -Some configure issues to fix problems with big filesystem detection. -@item -Fixed problem when sorting on big @code{BLOB} columns. -@item -@code{ROUND()} will now work on Windows. -@end itemize - - -@node News-3.22.26, News-3.22.25, News-3.22.27, News-3.22.x -@appendixsubsec Changes in release 3.22.26 (16 Sep 1999) - -@itemize @bullet -@item -Fixed core dump with empty @code{BLOB/TEXT} column argument to -@code{REVERSE()}. -@item -Extended @code{/*! */} with version numbers. -@item -Changed @code{SUBSTRING(text FROM pos)} to conform to ANSI SQL. (Before this -construct returned the rightmost 'pos' characters.) -@item -Fixed problem with @code{LOCK TABLES} combined with @code{DELETE FROM table} -@item -Fixed problem that @code{INSERT ... SELECT} didn't use @code{BIG_TABLES}. -@item -@code{SET SQL_LOW_PRIORITY_UPDATES=#} didn't work. -@item -Password wasn't updated correctly if privileges didn't change on: -@code{GRANT ... IDENTIFIED BY} -@item -Fixed range optimiser bug in -@code{SELECT * FROM table_name WHERE key_part1 >= const AND (key_part2 = const -OR key_part2 = const)}. -@item -Fixed bug in compression key handling in @code{ISAM}. -@end itemize - - -@node News-3.22.25, News-3.22.24, News-3.22.26, News-3.22.x -@appendixsubsec Changes in release 3.22.25 - -@itemize @bullet -@item -Fixed some small problems with the installation. -@end itemize - - -@node News-3.22.24, News-3.22.23, News-3.22.25, News-3.22.x -@appendixsubsec Changes in release 3.22.24 (05 Jul 1999) - -@itemize @bullet -@item -@code{DATA} is not a reserved word anymore. -@item -Fixed optimiser bug with tables with only one row. -@item -Fixed bug when using @code{LOCK TABLES table_name READ; FLUSH TABLES;} -@item -Applied some patches for HP-UX. -@item -@code{isamchk} should now work on Windows. -@item -Changed @file{configure} to not use big file handling on Linux as this -crashes some RedHat 6.0 systems -@end itemize - - -@node News-3.22.23, News-3.22.22, News-3.22.24, News-3.22.x -@appendixsubsec Changes in release 3.22.23 (08 Jun 1999) - -@itemize @bullet -@item -Upgraded to use Autoconf 2.13, Automake 1.4 and @code{libtool} 1.3.2. -@item -Better support for SCO in @code{configure}. -@item -Added option @code{--defaults-file=###} to option file handling to force use -of only one specific option file. -@item -Extended @code{CREATE} syntax to ignore MySQL Version 3.23 keywords. -@item -Fixed deadlock problem when using @code{INSERT DELAYED} on a table locked with -@code{LOCK TABLES}. -@item -Fixed deadlock problem when using @code{DROP TABLE} on a table that was -locked by another thread. -@item -Add logging of @code{GRANT/REVOKE} commands in the update log. -@item -Fixed @code{isamchk} to detect a new error condition. -@item -Fixed bug in @code{NATURAL LEFT JOIN}. -@end itemize - - -@node News-3.22.22, News-3.22.21, News-3.22.23, News-3.22.x -@appendixsubsec Changes in release 3.22.22 (30 Apr 1999) - -@itemize @bullet -@item -Fixed problem in the C API when you called @code{mysql_close()} directly after -@code{mysql_init()}. -@item -Better client error message when you can't open socket. -@item -Fixed @code{delayed_insert_thread} counting when you couldn't create a new -delayed_insert thread. -@item -Fixed bug in @code{CONCAT()} with many arguments. -@item -Added patches for DEC 3.2 and SCO. -@item -Fixed path-bug when installing MySQL as a service on NT. -@item -The MySQL-Windows version is now compiled with VC++ 6.0 instead of -with VC++ 5.0. -@item -New installation setup for MySQL-Windows. -@end itemize - - -@node News-3.22.21, News-3.22.20, News-3.22.22, News-3.22.x -@appendixsubsec Changes in release 3.22.21 - -@itemize @bullet -@item -Fixed problem with @code{DELETE FROM TABLE} when table was locked by -another thread. -@item -Fixed bug in @code{LEFT JOIN} involving empty tables. -@item -Changed the @code{mysql.db} column from @code{CHAR(32)} to @code{CHAR(60)}. -@item -@code{MODIFY} and @code{DELAYED} are not reserved words anymore. -@item -Fixed a bug when storing days in a @code{TIME} column. -@item -Fixed a problem with @code{Host '...' is not allowed to connect to this MySQL -server} after one had inserted a new MySQL user with a @code{GRANT} -command. -@item -Changed to use @code{TCP_NODELAY} also on Linux (should give faster TCP/IP -connections). -@end itemize - - -@node News-3.22.20, News-3.22.19, News-3.22.21, News-3.22.x -@appendixsubsec Changes in release 3.22.20 (18 Mar 1999) - -@itemize @bullet -@item -Fixed @code{STD()} for big tables when result should be 0. -@item -The update log didn't have newlines on some operating systems. -@item -@code{INSERT DELAYED} had some garbage at end in the update log. -@end itemize - - -@node News-3.22.19, News-3.22.18, News-3.22.20, News-3.22.x -@appendixsubsec Changes in release 3.22.19 (Mar 1999: Stable) - -@itemize @bullet -@item -Fixed bug in @code{mysql_install_db} (from 3.22.17). -@item -Changed default key cache size to 8M. -@item -Fixed problem with queries that needed temporary tables with @code{BLOB} -columns. -@end itemize - - -@node News-3.22.18, News-3.22.17, News-3.22.19, News-3.22.x -@appendixsubsec Changes in release 3.22.18 - -@itemize @bullet -@item -Fixes a fatal problem in 3.22.17 on Linux; after @code{shutdown} -not all threads died properly. -@item -Added option @code{-O flush_time=#} to @code{mysqld}. This is mostly -useful on Windows and tells how often MySQL should close all -unused tables and flush all updated tables to disk. -@item -Fixed problem that a @code{VARCHAR} column compared with @code{CHAR} column -didn't use keys efficiently. -@end itemize - - -@node News-3.22.17, News-3.22.16, News-3.22.18, News-3.22.x -@appendixsubsec Changes in release 3.22.17 - -@itemize @bullet -@item -Fixed a core dump problem when using @code{--log-update} and connecting -without a default database. -@item -Fixed some @code{configure} and portability problems. -@item -Using @code{LEFT JOIN} on tables that had circular dependencies caused -@code{mysqld} to hang forever. -@end itemize - - -@node News-3.22.16, News-3.22.15, News-3.22.17, News-3.22.x -@appendixsubsec Changes in release 3.22.16 (Feb 1999: Gamma) - -@itemize @bullet -@item -@code{mysqladmin processlist} could kill the server if a new user logged in. -@item -@code{DELETE FROM tbl_name WHERE key_column=col_name} didn't find any matching -rows. Fixed. -@item -@code{DATE_ADD(column, ...)} didn't work. -@item -@code{INSERT DELAYED} could deadlock with status 'upgrading lock' -@item -Extended @code{ENCRYPT()} to take longer salt strings than 2 characters. -@item -@code{longlong2str} is now much faster than before. For @code{Intel x86} -platforms, this function is written in optimised assembler. -@item -Added the @code{MODIFY} keyword to @code{ALTER TABLE}. -@end itemize - - -@node News-3.22.15, News-3.22.14, News-3.22.16, News-3.22.x -@appendixsubsec Changes in release 3.22.15 - -@itemize @bullet -@item -@code{GRANT} used with @code{IDENTIFIED BY} didn't take effect until privileges -were flushed. -@item -Name change of some variables in @code{SHOW STATUS}. -@item -Fixed problem with @code{ORDER BY} with 'only index' optimisation when there -were multiple key definitions for a used column. -@item -@code{DATE} and @code{DATETIME} columns are now up to 5 times faster than -before. -@item -@code{INSERT DELAYED} can be used to let the client do other things while the -server inserts rows into a table. -@item -@code{LEFT JOIN USING (col1,col2)} didn't work if one used it with tables -from 2 different databases. -@item -@code{LOAD DATA LOCAL INFILE} didn't work in the Unix version because of -a missing file. -@item -Fixed problems with @code{VARCHAR}/@code{BLOB} on very short rows (< 4 bytes); -error 127 could occur when deleting rows. -@item -Updating @code{BLOB/TEXT} through formulas didn't work for short (< 256 char) -strings. -@item -When you did a @code{GRANT} on a new host, @code{mysqld} could die on the first -connect from this host. -@item -Fixed bug when one used @code{ORDER BY} on column name that was the same -name as an alias. -@item -Added @code{BENCHMARK(loop_count,expression)} function to time expressions. -@end itemize - - -@node News-3.22.14, News-3.22.13, News-3.22.15, News-3.22.x -@appendixsubsec Changes in release 3.22.14 - -@itemize @bullet -@item -Allow empty arguments to @code{mysqld} to make it easier to start from shell -scripts. -@item -Setting a @code{TIMESTAMP} column to @code{NULL} didn't record the timestamp -value in the update log. -@item -Fixed lock handler bug when one did -@code{INSERT INTO TABLE ... SELECT ... GROUP BY}. -@item -Added a patch for @code{localtime_r()} on Windows so that it will not crash -anymore if your date is > 2039, but instead will return a time of all zero. -@item -Names for -user-defined functions are no longer case-sensitive. -@item -Added escape of @code{^Z} (ASCII 26) to @code{\Z} as @code{^Z} doesn't -work with pipes on Windows. -@item -@code{mysql_fix_privileges} adds a new column to the @code{mysql.func} to -support aggregate UDF functions in future MySQL releases. -@end itemize - - -@node News-3.22.13, News-3.22.12, News-3.22.14, News-3.22.x -@appendixsubsec Changes in release 3.22.13 - -@itemize @bullet -@item -Saving @code{NOW()}, @code{CURDATE()} or @code{CURTIME()} directly in a -column didn't work. -@item -@code{SELECT COUNT(*) ... LEFT JOIN ...} didn't work with no @code{WHERE} part. -@item -Updated @file{config.guess} to allow MySQL to configure on -UnixWare 7.0.x. -@item -Changed the implementation of @code{pthread_cond()} on the Windows version. -@code{get_lock()} now correctly times out on Windows! -@end itemize - - -@node News-3.22.12, News-3.22.11, News-3.22.13, News-3.22.x -@appendixsubsec Changes in release 3.22.12 - -@itemize @bullet -@item -Fixed problem when using @code{DATE_ADD()} and @code{DATE_SUB()} in a -@code{WHERE} clause. -@item -You can now set the password for a user with the @code{GRANT ... TO user -IDENTIFIED BY 'password'} syntax. -@item -Fixed bug in @code{GRANT} checking with @code{SELECT} on many tables. -@item -Added missing file @code{mysql_fix_privilege_tables} to the RPM -distribution. This is not run by default because it relies on the client -package. -@item -Added option @code{SQL_SMALL_RESULT} to @code{SELECT} to force use of -fast temporary tables when you know that the result set will be small. -@item -Allow use of negative real numbers without a decimal point. -@item -Day number is now adjusted to maximum days in month if the resulting month -after @code{DATE_ADD}/@code{DATE_SUB()} doesn't have enough days. -@item -Fix that @code{GRANT} compares columns in case-insensitive fashion. -@item -Fixed a bug in @file{sql_list.h} that made @code{ALTER TABLE} dump core in -some contexts. -@item -The hostname in @code{user@@hostname} can now include @samp{.} and @samp{-} -without quotes in the context of the @code{GRANT}, @code{REVOKE} and -@code{SET PASSWORD FOR ...} statements. -@item -Fix for @code{isamchk} for tables which need big temporary files. -@end itemize - - -@node News-3.22.11, News-3.22.10, News-3.22.12, News-3.22.x -@appendixsubsec Changes in release 3.22.11 - -@itemize @bullet -@item -@strong{Important}: You must run the @code{mysql_fix_privilege_tables} script -when you upgrade to this version! This is needed because of the new -@code{GRANT} system. If you don't do this, you will get @code{Access -denied} when you try to use @code{ALTER TABLE}, @code{CREATE INDEX}, or -@code{DROP INDEX}. -@item -@code{GRANT} to allow/deny users table and column access. -@item -Changed @code{USER()} to return a value in @code{user@@host} format. -Formerly it returned only @code{user}. -@item -Changed the syntax for how to set @code{PASSWORD} for another user. -@item -New command @code{FLUSH STATUS} that resets most status variables to zero. -@item -New status variables: @code{aborted_threads}, @code{aborted_connects}. -@item -New option variable: @code{connection_timeout}. -@item -Added support for Thai sorting (by Pruet Boonma -@email{pruet@@ds90.intanon.nectec.or.th}). -@item -Slovak and japanese error messages. -@item -Configuration and portability fixes. -@item -Added option @code{SET SQL_WARNINGS=1} to get a warning count also for simple -inserts. -@item -MySQL now uses @code{SIGTERM} instead of @code{SIGQUIT} with -shutdown to work better on FreeBSD. -@item -Added option @code{\G} (print vertically) to @code{mysql}. -@item -@code{SELECT HIGH_PRIORITY ...} killed @code{mysqld}. -@item -@code{IS NULL} on a @code{AUTO_INCREMENT} column in a @code{LEFT JOIN} didn't -work as expected. -@item -New function @code{MAKE_SET()}. -@end itemize - - -@node News-3.22.10, News-3.22.9, News-3.22.11, News-3.22.x -@appendixsubsec Changes in release 3.22.10 - -@itemize @bullet -@item -@code{mysql_install_db} no longer starts the MySQL server! You -should start @code{mysqld} with @code{safe_mysqld} after installing it! The -MySQL RPM will, however, start the server as before. -@item -Added @code{--bootstrap} option to @code{mysqld} and recoded -@code{mysql_install_db} to use it. This will make it easier to install -MySQL with RPMs. -@item -Changed @code{+}, @code{-} (sign and minus), @code{*}, @code{/}, @code{%}, -@code{ABS()} and @code{MOD()} to be @code{BIGINT} aware (64-bit safe). -@item -Fixed a bug in @code{ALTER TABLE} that caused @code{mysqld} to crash. -@item -MySQL now always reports the conflicting key values when a -duplicate key entry occurs. (Before this was only reported for @code{INSERT}.) -@item -New syntax: @code{INSERT INTO tbl_name SET col_name=value, col_name=value, ...} -@item -Most errors in the @file{.err} log are now prefixed with a time stamp. -@item -Added option @code{MYSQL_INIT_COMMAND} to @code{mysql_options()} to make -a query on connect or reconnect. -@item -Added option @code{MYSQL_READ_DEFAULT_FILE} and -@code{MYSQL_READ_DEFAULT_GROUP} to @code{mysql_options()} to read the -following parameters from the MySQL option files: @code{port}, -@code{socket}, @code{compress}, @code{password}, @code{pipe}, @code{timeout}, -@code{user}, @code{init-command}, @code{host} and @code{database}. -@item -Added @code{maybe_null} to the UDF structure. -@item -Added option @code{IGNORE} to @code{INSERT} statements with many rows. -@item -Fixed some problems with sorting of the @code{koi8} character sets; users of -@code{koi8} @strong{must} run @code{isamchk -rq} on each table that has an -index on a @code{CHAR} or @code{VARCHAR} column. -@item -New script @code{mysql_setpermission}, by Luuk de Boer. It allows easy -creation of new users with permissions for specific databases. -@item -Allow use of hexadecimal strings (0x...) when specifying a constant string -(like in the column separators with @code{LOAD DATA INFILE}). -@item -Ported to OS/2 (thanks to Antony T. Curtis @email{antony.curtis@@olcs.net}). -@item -Added more variables to @code{SHOW STATUS} and changed format of output to -be like @code{SHOW VARIABLES}. -@item -Added @code{extended-status} command to @code{mysqladmin} which will show the -new status variables. -@end itemize - - -@node News-3.22.9, News-3.22.8, News-3.22.10, News-3.22.x -@appendixsubsec Changes in release 3.22.9 - -@itemize @bullet -@item -@code{SET SQL_LOG_UPDATE=0} caused a lockup of the server. -@item -New SQL command: @code{FLUSH [ TABLES | HOSTS | LOGS | PRIVILEGES ] [, ...]} -@item -New SQL command: @code{KILL} @code{thread_id}. -@item -Added casts and changed include files to make MySQL easier to -compile on AIX and DEC OSF/1 4.x -@item -Fixed conversion problem when using @code{ALTER TABLE} from a @code{INT} -to a short @code{CHAR()} column. -@item -Added @code{SELECT HIGH_PRIORITY}; this will get a lock for the -@code{SELECT} even if there is a thread waiting for another -@code{SELECT} to get a @code{WRITE LOCK}. -@item -Moved @code{wild_compare()} to string class to be able to use @code{LIKE} on -@code{BLOB}/@code{TEXT} columns with @code{\0}. -@item -Added @code{ESCAPE} option to @code{LIKE}. -@item -Added a lot more output to @code{mysqladmin debug}. -@item -You can now start @code{mysqld} on Windows with the @code{--flush} option. -This will flush all tables to disk after each update. This makes things -much safer on the Windows platforms but also @strong{much} slower. -@end itemize - - -@node News-3.22.8, News-3.22.7, News-3.22.9, News-3.22.x -@appendixsubsec Changes in release 3.22.8 - -@itemize @bullet -@item -Czech character sets should now work much better. You must also install -@uref{http://www.mysql.com/Downloads/Patches/czech-3.22.8-patch}. -This patch should also be installed if you are using a character set which -uses @code{my_strcoll()}! The patch should always be safe to install (for any -system), but as this patch changes @code{ISAM} internals it's not yet in the -default distribution. -@item -@code{DATE_ADD()} and @code{DATE_SUB()} didn't work with group functions. -@item -@code{mysql} will now also try to reconnect on @code{USE DATABASE} commands. -@item -Fix problem with @code{ORDER BY} and @code{LEFT JOIN} and @code{const} tables. -@item -Fixed problem with @code{ORDER BY} if the first @code{ORDER BY} column -was a key and the rest of the @code{ORDER BY} columns wasn't part of the key. -@item -Fixed a big problem with @code{OPTIMIZE TABLE}. -@item -MySQL clients on NT will now by default first try to connect with -named pipes and after this with TCP/IP. -@item -Fixed a problem with @code{DROP TABLE} and @code{mysqladmin shutdown} on Windows -(a fatal bug from 3.22.6). -@item -Fixed problems with @code{TIME columns} and negative strings. -@item -Added an extra thread signal loop on shutdown to avoid some error messages -from the client. -@item -MySQL now uses the next available number as extension for the update -log file. -@item -Added patches for UNIXWARE 7. -@end itemize - - -@node News-3.22.7, News-3.22.6, News-3.22.8, News-3.22.x -@appendixsubsec Changes in release 3.22.7 (Sep 1998: Beta) - -@itemize @bullet -@item -Added @code{LIMIT} clause for the @code{DELETE} statement. -@item -You can now use the @code{/*! ... */} syntax to hide MySQL-specific -keywords when you write portable code. MySQL will parse the code -inside the comments as if the surrounding @code{/*!} and @code{*/} comment -characters didn't exist. -@item -@code{OPTIMIZE TABLE tbl_name} can now be used to reclaim disk space -after many deletes. Currently, this uses @code{ALTER TABLE} to -regenerate the table, but in the future it will use an integrated -@code{isamchk} for more speed. -@item -Upgraded @code{libtool} to get the configure more portable. -@item -Fixed slow @code{UPDATE} and @code{DELETE} operations when using -@code{DATETIME} or @code{DATE} keys. -@item -Changed optimiser to make it better at deciding when to do a full join -and when using keys. -@item -You can now use @code{mysqladmin proc} to display information about your own -threads. Only users with the @code{PROCESS} privilege can get -information about all threads. -(In 4.0.2 one needs the @code{SUPER} privilege for this.) -@item -Added handling of formats @code{YYMMDD}, @code{YYYYMMDD}, -@code{YYMMDDHHMMSS} for numbers when using @code{DATETIME} and -@code{TIMESTAMP} types. (Formerly these formats only worked with strings.) -@item -Added connect option @code{CLIENT_IGNORE_SPACE} to allow use of spaces -after function names and before @samp{(} (Powerbuilder requires this). -This will make all function names reserved words. -@item -Added the @code{--log-long-format} option to @code{mysqld} to enable timestamps -and INSERT_ID's in the update log. -@item -Added @code{--where} option to @code{mysqldump} (patch by Jim Faucette). -@item -The lexical analyser now uses ``perfect hashing'' for faster parsing of SQL -statements. -@end itemize - - -@node News-3.22.6, News-3.22.5, News-3.22.7, News-3.22.x -@appendixsubsec Changes in release 3.22.6 - -@itemize @bullet -@item -Faster @code{mysqldump}. -@item -For the @code{LOAD DATA INFILE} statement, you can now use the new @code{LOCAL} -keyword to read the file from the client. @code{mysqlimport} will -automatically use @code{LOCAL} when importing with the TCP/IP protocol. -@item -Fixed small optimise problem when updating keys. -@item -Changed makefiles to support shared libraries. -@item -MySQL-NT can now use named pipes, which means that you can now use -MySQL-NT without having to install TCP/IP. -@end itemize - - -@node News-3.22.5, News-3.22.4, News-3.22.6, News-3.22.x -@appendixsubsec Changes in release 3.22.5 - -@itemize @bullet -@item -All table lock handing is changed to avoid some very subtle -deadlocks when using @code{DROP TABLE}, @code{ALTER TABLE}, @code{DELETE FROM -TABLE} and @code{mysqladmin flush-tables} under heavy usage. -Changed locking code to get better handling of locks of different types. -@item -Updated @code{DBI} to 1.00 and @code{DBD} to 1.2.0. -@item -Added a check that the error message file contains error messages suitable for -the current version of @code{mysqld}. (To avoid errors if you accidentally -try to use an old error message file.) -@item -All count structures in the client (@code{affected_rows()}, -@code{insert_id()}, ...) are now of type @code{BIGINT} to allow 64-bit values -to be used. -This required a minor change in the MySQL protocol which should affect -only old clients when using tables with @code{AUTO_INCREMENT} values > 16M. -@item -The return type of @code{mysql_fetch_lengths()} has changed from @code{uint *} -to @code{ulong *}. This may give a warning for old clients but should work -on most machines. -@item -Change @code{mysys} and @code{dbug} libraries to allocate all thread variables -in one struct. This makes it easier to make a threaded @file{libmysql.dll} -library. -@item -Use the result from @code{gethostname()} (instead of @code{uname()}) when -constructing @file{.pid} file names. -@item -New better compressed server/client protocol. -@item -@code{COUNT()}, @code{STD()} and @code{AVG()} are extended to handle more than -4G rows. -@item -You can now store values in the range @code{-838:59:59} <= x <= -@code{838:59:59} in a @code{TIME} column. -@item -@strong{Warning: incompatible change!!} -If you set a @code{TIME} column to too short a value, MySQL now -assumes the value is given as: @code{[[[D ]HH:]MM:]SS} instead of -@code{HH[:MM[:SS]]}. -@item -@code{TIME_TO_SEC()} and @code{SEC_TO_TIME()} can now handle negative times -and hours up to 32767. -@item -Added new option -@code{SET SQL_LOG_UPDATE=@{0|1@}} to allow users with -the @code{PROCESS} privilege to bypass the update log. -(Modified patch from Sergey A Mukhin @email{violet@@rosnet.net}.) -@item -Fixed fatal bug in @code{LPAD()}. -@item -Initialise line buffer in @file{mysql.cc} to make @code{BLOB} reading from -pipes safer. -@item -Added @code{-O max_connect_errors=#} option to @code{mysqld}. -Connect errors are now reset for each correct connection. -@item -Increased the default value of @code{max_allowed_packet} to @code{1M} in -@code{mysqld}. -@item -Added @code{--low-priority-updates} option to @code{mysqld}, to give -table-modifying operations (@code{INSERT}, @code{REPLACE}, @code{UPDATE}, -@code{DELETE}) lower priority than retrievals. You can now use -@code{@{INSERT | REPLACE | UPDATE | DELETE@} LOW_PRIORITY ...} You can -also use @code{SET SQL_LOW_PRIORITY_UPDATES=@{0|1@}} to change -the priority for one thread. One side effect is that @code{LOW_PRIORITY} -is now a reserved word. :( -@item -Add support for @code{INSERT INTO table ... VALUES(...),(...),(...)}, -to allow inserting multiple rows with a single statement. -@item -@code{INSERT INTO tbl_name} is now also cached when used with @code{LOCK TABLES}. -(Previously only @code{INSERT ... SELECT} and @code{LOAD DATA INFILE} were -cached.) -@item -Allow @code{GROUP BY} functions with @code{HAVING}: -@example -mysql> SELECT col FROM table GROUP BY col HAVING COUNT(*)>0; -@end example -@item -@code{mysqld} will now ignore trailing @samp{;} characters in queries. This -is to make it easier to migrate from some other SQL servers that require the -trailing @samp{;}. -@item -Fix for corrupted fixed-format output generated by @code{SELECT INTO OUTFILE}. -@item -@strong{Warning: incompatible change!} -Added Oracle @code{GREATEST()} and @code{LEAST()} functions. You must now use -these instead of the @code{MAX()} and @code{MIN()} functions to get the -largest/smallest value from a list of values. These can now handle @code{REAL}, -@code{BIGINT} and string (@code{CHAR} or @code{VARCHAR}) values. -@item -@strong{Warning: incompatible change!} -@code{DAYOFWEEK()} had offset 0 for Sunday. Changed the offset to 1. -@item -Give an error for queries that mix @code{GROUP BY} columns and fields when -there is no @code{GROUP BY} specification. -@item -Added @code{--vertical} option to @code{mysql}, for printing results in -vertical mode. -@item -Index-only optimisation; some queries are now resolved using -only indexes. Until MySQL 4.0, this works only for numeric columns. -@xref{MySQL indexes, , MySQL indexes}. -@item -Lots of new benchmarks. -@item -A new C API chapter and lots of other improvements in the manual. -@end itemize - - -@node News-3.22.4, News-3.22.3, News-3.22.5, News-3.22.x -@appendixsubsec Changes in release 3.22.4 - -@itemize @bullet -@item -Added @code{--tmpdir} option to @code{mysqld}, for specifying the location -of the temporary file directory. -@item -MySQL now automatically changes a query from an ODBC client: -@example -SELECT ... FROM table WHERE auto_increment_column IS NULL -@end example -to: -@example -SELECT ... FROM table WHERE auto_increment_column == LAST_INSERT_ID() -@end example -This allows some ODBC programs (Delphi, Access) to retrieve the newly -inserted row to fetch the @code{AUTO_INCREMENT} id. -@item -@code{DROP TABLE} now waits for all users to free a table before deleting it. -@item -Fixed small memory leak in the new connect protocol. -@item -New functions @code{BIN()}, @code{OCT()}, @code{HEX()} and @code{CONV()} for -converting between different number bases. -@item -Added function @code{SUBSTRING()} with 2 arguments. -@item -If you created a table with a record length smaller than 5, you couldn't -delete rows from the table. -@item -Added optimisation to remove const reference tables from @code{ORDER BY} and -@code{GROUP BY}. -@item -@code{mysqld} now automatically disables system locking on Linux and Windows, -and for systems that use MIT-pthreads. You can force the use of locking -with the @code{--enable-external-locking} option. -@item -Added @code{--console} option to @code{mysqld}, to force a console window -(for error messages) when using Windows. -@item -Fixed table locks for Windows. -@item -Allow @samp{$} in identifiers. -@item -Changed name of user-specific configuration file from @file{my.cnf} to -@file{.my.cnf} (Unix only). -@item -Added @code{DATE_ADD()} and @code{DATE_SUB()} functions. -@end itemize - - -@node News-3.22.3, News-3.22.2, News-3.22.4, News-3.22.x -@appendixsubsec Changes in release 3.22.3 - -@itemize @bullet -@item -Fixed a lock problem (bug in MySQL Version 3.22.1) when closing temporary tables. -@item -Added missing @code{mysql_ping()} to the client library. -@item -Added @code{--compress} option to all MySQL clients. -@item -Changed @code{byte} to @code{char} in @file{mysql.h} and @file{mysql_com.h}. -@end itemize - - -@node News-3.22.2, News-3.22.1, News-3.22.3, News-3.22.x -@appendixsubsec Changes in release 3.22.2 - -@itemize @bullet -@item -Searching on multiple constant keys that matched more than 30% of the rows -didn't always use the best possible key. -@item -New functions @code{<<}, @code{>>}, @code{RPAD()} and @code{LPAD()}. -@item -You can now save default options (like passwords) in a configuration file -(@file{my.cnf}). -@item -Lots of small changes to get @code{ORDER BY} to work when no records are found -when using fields that are not in @code{GROUP BY} (MySQL extension). -@item -Added @code{--chroot} option to @code{mysqld}, to start @code{mysqld} in -a chroot environment (by Nikki Chumakov @email{nikkic@@cityline.ru}). -@item -Trailing spaces are now ignored when comparing case-sensitive strings; -this should fix some problems with ODBC and flag 512! -@item -Fixed a core dump bug in the range optimiser. -@item -Added @code{--one-thread} option to @code{mysqld}, for debugging with -LinuxThreads (or @code{glibc}). (This replaces the @code{-T32} flag) -@item -Added @code{DROP TABLE IF EXISTS} to prevent an error from occurring if the -table doesn't exist. -@item -@code{IF} and @code{EXISTS} are now reserved words (they would have to -be sooner or later). -@item -Added lots of new options to @code{mysqldump}. -@item -Server error messages are now in @file{mysqld_error.h}. -@item -The server/client protocol now supports compression. -@item -All bug fixes from MySQL Version 3.21.32. -@end itemize - - -@node News-3.22.1, News-3.22.0, News-3.22.2, News-3.22.x -@appendixsubsec Changes in release 3.22.1 (Jun 1998: Alpha) - -@itemize @bullet -@item -Added new C API function @code{mysql_ping()}. -@item -Added new API functions @code{mysql_init()} and @code{mysql_options()}. -You now MUST call @code{mysql_init()} before you call -@code{mysql_real_connect()}. -You don't have to call @code{mysql_init()} if you only use -@code{mysql_connect()}. -@item -Added @code{mysql_options(...,MYSQL_OPT_CONNECT_TIMEOUT,...)} so you can set a -timeout for connecting to a server. -@item -Added @code{--timeout} option to @code{mysqladmin}, as a test of -@code{mysql_options()}. -@item -Added @code{AFTER column} and @code{FIRST} options to -@code{ALTER TABLE ... ADD columns}. -This makes it possible to add a new column at some specific location -within a row in an existing table. -@item -@code{WEEK()} now takes an optional argument to allow handling of weeks when -the week starts on Monday (some European countries). By default, -@code{WEEK()} assumes the week starts on Sunday. -@item -@code{TIME} columns weren't stored properly (bug in MySQL Version 3.22.0). -@item -@code{UPDATE} now returns information about how many rows were -matched and updated, and how many ``warnings'' occurred when doing the update. -@item -Fixed incorrect result from @code{FORMAT(-100,2)}. -@item -@code{ENUM} and @code{SET} columns were compared in binary (case-sensitive) -fashion; changed to be case-insensitive. -@end itemize - - -@node News-3.22.0, , News-3.22.1, News-3.22.x -@appendixsubsec Changes in release 3.22.0 - -@itemize @bullet -@item -New (backward-compatible) connect protocol that allows you to -specify the database to use when connecting, to get much faster -connections to a specific database. - -The @code{mysql_real_connect()} call is changed to: - -@example -mysql_real_connect(MYSQL *mysql, const char *host, const char *user, - const char *passwd, const char *db, uint port, - const char *unix_socket, uint client_flag) -@end example -@item -Each connection is handled by its own thread, rather than by the -master @code{accept()} thread. This fixes permanently the telnet bug -that was a topic on the mail list some time ago. -@item -All TCP/IP connections are now checked with backward-resolution of -the hostname to get better security. @code{mysqld} now has a local hostname -resolver cache so connections should actually be faster than before, -even with this feature. -@item -A site automatically will be blocked from future connections if someone -repeatedly connects with an ``improper header'' (like when one uses telnet). -@item -You can now refer to tables in different databases with references of the form -@code{tbl_name@@db_name} or @code{db_name.tbl_name}. This makes it possible to -give a user read access to some tables and write access to others simply by -keeping them in different databases! -@item -Added @code{--user} option to @code{mysqld}, to allow it to run -as another Unix user (if it is started as the Unix @code{root} user). -@item -Added caching of users and access rights (for faster access rights checking) -@item -Normal users (not anonymous ones) can change their password with -@code{mysqladmin password 'new_password'}. This uses encrypted passwords -that are not logged in the normal MySQL log! -@item -All important string functions are now coded in assembler for x86 Linux -machines. This gives a speedup of 10% in many cases. -@item -For tables that have many columns, the column names are now hashed for -much faster column name lookup (this will speed up some benchmark -tests a lot!) -@item -Some benchmarks are changed to get better individual timing. -(Some loops were so short that a specific test took < 2 seconds. The -loops have been changed to take about 20 seconds to make it easier -to compare different databases. A test that took 1-2 seconds before -now takes 11-24 seconds, which is much better) -@item -Re-arranged @code{SELECT} code to handle some very specific queries -involving group functions (like @code{COUNT(*)}) without a @code{GROUP BY} but -with @code{HAVING}. The following now works: -@example -mysql> SELECT COUNT(*) as C FROM table HAVING C > 1; -@end example -@item -Changed the protocol for field functions to be faster and avoid some -calls to @code{malloc()}. -@item -Added @code{-T32} option to @code{mysqld}, for running all queries under the -main thread. This makes it possible to debug @code{mysqld} under Linux with -@code{gdb}! -@item -Added optimisation of @code{not_null_column IS NULL} (needed for some Access -queries). -@item -Allow @code{STRAIGHT_JOIN} to be used between two tables to force the optimiser -to join them in a specific order. -@item -String functions now return @code{VARCHAR} rather than @code{CHAR} and -the column type is now @code{VARCHAR} for fields saved as @code{VARCHAR}. -This should make the @code{MyODBC} driver better, but may break some old -MySQL clients that don't handle @code{FIELD_TYPE_VARCHAR} the same -way as @code{FIELD_TYPE_CHAR}. -@item -@code{CREATE INDEX} and @code{DROP INDEX} are now implemented through -@code{ALTER TABLE}. -@code{CREATE TABLE} is still the recommended (fast) way to create indexes. -@item -Added @code{--set-variable} option @code{wait_timeout} to @code{mysqld}. -@item -Added time column to @code{mysqladmin processlist} to show how long a query -has taken or how long a thread has slept. -@item -Added lots of new variables to @code{show variables} and some new to -@code{show status}. -@item -Added new type @code{YEAR}. @code{YEAR} is stored in 1 byte with allowable -values of 0, and 1901 to 2155. -@item -Added new @code{DATE} type that is stored in 3 bytes rather than 4 bytes. -All new tables are created with the new date type if you don't use the -@code{--old-protocol} option to @code{mysqld}. -@item -Fixed bug in record caches; for some queries, you could get -@code{Error from table handler: #} on some operating systems. -@item -Added @code{--enable-assembler} option to @code{configure}, for x86 machines -(tested on Linux + @code{gcc}). This will enable assembler functions for the -most important string functions for more speed! -@end itemize - - -@node News-3.21.x, News-3.20.x, News-3.22.x, News -@appendixsec Changes in release 3.21.x - -@cindex changes, version 3.21 - -Version 3.21 is quite old now, and should be avoided if possible. This -information is kept here for historical purposes only. - -@menu -* News-3.21.33:: Changes in release 3.21.33 -* News-3.21.32:: Changes in release 3.21.32 -* News-3.21.31:: Changes in release 3.21.31 -* News-3.21.30:: Changes in release 3.21.30 -* News-3.21.29:: Changes in release 3.21.29 -* News-3.21.28:: Changes in release 3.21.28 -* News-3.21.27:: Changes in release 3.21.27 -* News-3.21.26:: Changes in release 3.21.26 -* News-3.21.25:: Changes in release 3.21.25 -* News-3.21.24:: Changes in release 3.21.24 -* News-3.21.23:: Changes in release 3.21.23 -* News-3.21.22:: Changes in release 3.21.22 -* News-3.21.21a:: Changes in release 3.21.21a -* News-3.21.21:: Changes in release 3.21.21 -* News-3.21.20:: Changes in release 3.21.20 -* News-3.21.19:: Changes in release 3.21.19 -* News-3.21.18:: Changes in release 3.21.18 -* News-3.21.17:: Changes in release 3.21.17 -* News-3.21.16:: Changes in release 3.21.16 -* News-3.21.15:: Changes in release 3.21.15 -* News-3.21.14b:: Changes in release 3.21.14b -* News-3.21.14a:: Changes in release 3.21.14a -* News-3.21.13:: Changes in release 3.21.13 -* News-3.21.12:: Changes in release 3.21.12 -* News-3.21.11:: Changes in release 3.21.11 -* News-3.21.10:: Changes in release 3.21.10 -* News-3.21.9:: Changes in release 3.21.9 -* News-3.21.8:: Changes in release 3.21.8 -* News-3.21.7:: Changes in release 3.21.7 -* News-3.21.6:: Changes in release 3.21.6 -* News-3.21.5:: Changes in release 3.21.5 -* News-3.21.4:: Changes in release 3.21.4 -* News-3.21.3:: Changes in release 3.21.3 -* News-3.21.2:: Changes in release 3.21.2 -* News-3.21.0:: Changes in release 3.21.0 -@end menu - - -@node News-3.21.33, News-3.21.32, News-3.21.x, News-3.21.x -@appendixsubsec Changes in release 3.21.33 - -@itemize @bullet -@item -Fixed problem when sending @code{SIGHUP} to @code{mysqld}; -@code{mysqld} core dumped when starting from boot on some systems. -@item -Fixed problem with losing a little memory for some connections. -@item -@code{DELETE FROM tbl_name} without a @code{WHERE} condition is now done the -long way when you use @code{LOCK TABLES} or if the table is in use, to -avoid race conditions. -@item -@code{INSERT INTO TABLE (timestamp_column) VALUES (NULL);} didn't set timestamp. -@end itemize - - -@node News-3.21.32, News-3.21.31, News-3.21.33, News-3.21.x -@appendixsubsec Changes in release 3.21.32 - -@itemize @bullet -@item -Fixed some possible race conditions when doing many reopen/close on the same -tables under heavy load! This can happen if you execute @code{mysqladmin -refresh} often. This could in some very rare cases corrupt the header of the -index file and cause error 126 or 138. - -@item -Fixed fatal bug in @code{refresh()} when running with the -@code{--skip-external-locking} option. There was a ``very small'' time gap after -a @code{mysqladmin refresh} when a table could be corrupted if one -thread updated a table while another thread did @code{mysqladmin -refresh} and another thread started a new update ont the same table -before the first thread had finished. A refresh (or -@code{--flush-tables}) will now not return until all used tables are -closed! -@item -@code{SELECT DISTINCT} with a @code{WHERE} clause that didn't match any rows -returned a row in some contexts (bug only in 3.21.31). -@item -@code{GROUP BY} + @code{ORDER BY} returned one empty row when no rows where -found. -@item -Fixed a bug in the range optimiser that wrote -@code{Use_count: Wrong count for ...} in the error log file. -@end itemize - - -@node News-3.21.31, News-3.21.30, News-3.21.32, News-3.21.x -@appendixsubsec Changes in release 3.21.31 - -@itemize @bullet -@item -Fixed a sign extension problem for the @code{TINYINT} type on Irix. -@item -Fixed problem with @code{LEFT("constant_string",function)}. -@item -Fixed problem with @code{FIND_IN_SET()}. -@item -@code{LEFT JOIN} core dumped if the second table is used with a constant -@code{WHERE/ON} expression that uniquely identifies one record. -@item -Fixed problems with @code{DATE_FORMAT()} and incorrect dates. -@code{DATE_FORMAT()} now ignores @code{'%'} to make it possible to extend -it more easily in the future. -@end itemize - - -@node News-3.21.30, News-3.21.29, News-3.21.31, News-3.21.x -@appendixsubsec Changes in release 3.21.30 - -@itemize @bullet -@item -@code{mysql} now returns an exit code > 0 if the query returned an error. -@item -Saving of command-line history to file in @code{mysql} client. -By Tommy Larsen @email{tommy@@mix.hive.no}. -@item -Fixed problem with empty lines that were ignored in @file{mysql.cc}. -@item -Save the pid of the signal handler thread in the pid file instead -of the pid of the main thread. -@item -Added patch by @email{tommy@@valley.ne.jp} to support Japanese characters -SJIS and UJIS. -@item -Changed @code{safe_mysqld} to redirect startup messages to -@code{'hostname'.err} instead -of @code{'hostname'.log} to reclaim file space on @code{mysqladmin refresh}. -@item -@code{ENUM} always had the first entry as default value. -@item -@code{ALTER TABLE} wrote two entries to the update log. -@item -@code{sql_acc()} now closes the @code{mysql} grant tables after a reload to -save table space and memory. -@item -Changed @code{LOAD DATA} to use less memory with tables and @code{BLOB} -columns. -@item -Sorting on a function which made a division / 0 produced a wrong set -in some cases. -@item -Fixed @code{SELECT} problem with @code{LEFT()} when using the @code{czech} -character set. -@item -Fixed problem in @code{isamchk}; it couldn't repair a packed table in a very -unusual case. -@item -@code{SELECT} statements with @code{&} or @code{|} (bit functions) failed on -columns with @code{NULL} values. -@item -When comparing a field = field, where one of the fields was a part key, -only the length of the part key was compared. -@end itemize - - -@node News-3.21.29, News-3.21.28, News-3.21.30, News-3.21.x -@appendixsubsec Changes in release 3.21.29 - -@itemize @bullet -@item -@code{LOCK TABLES} + @code{DELETE from tbl_name} never removed locks properly. -@item -Fixed problem when grouping on an @code{OR} function. -@item -Fixed permission problem with @code{umask()} and creating new databases. -@item -Fixed permission problem on result file with @code{SELECT ... INTO OUTFILE ...} -@item -Fixed problem in range optimiser (core dump) for a very complex query. -@item -Fixed problem when using @code{MIN(integer)} or @code{MAX(integer)} in -@code{GROUP BY}. -@item -Fixed bug on Alpha when using integer keys. (Other keys worked on Alpha.) -@item -Fixed bug in @code{WEEK("XXXX-xx-01")}. -@end itemize - - -@node News-3.21.28, News-3.21.27, News-3.21.29, News-3.21.x -@appendixsubsec Changes in release 3.21.28 - -@itemize @bullet -@item -Fixed socket permission (clients couldn't connect to Unix socket on Linux). -@item -Fixed bug in record caches; for some queries, you could get -@code{Error from table handler: #} on some operating systems. -@end itemize - - -@node News-3.21.27, News-3.21.26, News-3.21.28, News-3.21.x -@appendixsubsec Changes in release 3.21.27 - -@itemize @bullet -@item -Added user level lock functions @code{GET_LOCK(string,timeout)}, -@code{RELEASE_LOCK(string)}. -@item -Added @code{Opened_tables} to @code{show status}. -@item -Changed connect timeout to 3 seconds to make it somewhat harder -for crackers to kill @code{mysqld} through telnet + TCP/IP. -@item -Fixed bug in range optimiser when using -@code{WHERE key_part_1 >= something AND key_part_2 <= something_else}. -@item -Changed @code{configure} for detection of FreeBSD 3.0 9803xx and above -@item -@code{WHERE} with @code{string_col_key = constant_string} didn't always -find all rows if the column had many values differing only with -characters of the same sort value (like e and @'e). -@item -Strings keys looked up with 'ref' were not compared in case-sensitive fashion. -@item -Added @code{umask()} to make log files non-readable for normal users. -@item -Ignore users with old (8-byte) password on startup if not using -@code{--old-protocol} option to @code{mysqld}. -@item -@code{SELECT} which matched all key fields returned the values in the -case of the matched values, not of the found values. (Minor problem.) -@end itemize - - -@node News-3.21.26, News-3.21.25, News-3.21.27, News-3.21.x -@appendixsubsec Changes in release 3.21.26 - -@itemize @bullet -@item -@code{FROM_DAYS(0)} now returns "0000-00-00". -@item -In @code{DATE_FORMAT()}, PM and AM were swapped for hours 00 and 12. -@item -Extended the default maximum key size to 256. -@item -Fixed bug when using @code{BLOB}/@code{TEXT} in @code{GROUP BY} with many -tables. -@item -An @code{ENUM} field that is not declared @code{NOT NULL} has @code{NULL} as -the default value. -(Previously, the default value was the first enumeration value.) -@item -Fixed bug in the join optimiser code when using many part keys -on the same key: @code{INDEX (Organisation,Surname(35),Initials(35))}. -@item -Added some tests to the table order optimiser to get some cases with -@code{SELECT ... FROM many_tables} much faster. -@item -Added a retry loop around @code{accept()} to possibly fix some problems on some -Linux machines. -@end itemize - - -@node News-3.21.25, News-3.21.24, News-3.21.26, News-3.21.x -@appendixsubsec Changes in release 3.21.25 - -@itemize @bullet -@item -Changed @code{typedef 'string'} to @code{typedef 'my_string'} for better -portability. -@item -You can now kill threads that are waiting on a disk-full condition. -@item -Fixed some problems with UDF functions. -@item -Added long options to @code{isamchk}. Try @code{isamchk --help}. -@item -Fixed a bug when using 8 bytes long (alpha); @code{filesort()} didn't work. -Affects @code{DISTINCT}, @code{ORDER BY} and @code{GROUP BY} on 64-bit -processors. -@end itemize - - -@node News-3.21.24, News-3.21.23, News-3.21.25, News-3.21.x -@appendixsubsec Changes in release 3.21.24 - -@itemize @bullet -@item -Dynamic loadable functions. Based on source from Alexis Mikhailov. -@item -You couldn't delete from a table if no one had done a @code{SELECT} on the -table. -@item -Fixed problem with range optimiser with many @code{OR} operators on key parts -inside each other. -@item -Recoded @code{MIN()} and @code{MAX()} to work properly with strings and -@code{HAVING}. -@item -Changed default umask value for new files from @code{0664} to @code{0660}. -@item -Fixed problem with @code{LEFT JOIN} and constant expressions in the @code{ON} -part. -@item -Added Italian error messages from @email{brenno@@dewinter.com}. -@item -@code{configure} now works better on OSF/1 (tested on 4.0D). -@item -Added hooks to allow @code{LIKE} optimisation with international character -support. -@item -Upgraded @code{DBI} to 0.93. -@end itemize - - -@node News-3.21.23, News-3.21.22, News-3.21.24, News-3.21.x -@appendixsubsec Changes in release 3.21.23 - -@itemize @bullet -@item -The following symbols are now reserved words: -@code{TIME}, @code{DATE}, @code{TIMESTAMP}, @code{TEXT}, @code{BIT}, -@code{ENUM}, @code{NO}, @code{ACTION}, @code{CHECK}, @code{YEAR}, -@code{MONTH}, @code{DAY}, @code{HOUR}, @code{MINUTE}, @code{SECOND}, -@code{STATUS}, @code{VARIABLES}. -@item -Setting a @code{TIMESTAMP} to @code{NULL} in @code{LOAD DATA INFILE ...} didn't -set the current time for the @code{TIMESTAMP}. -@item -Fix @code{BETWEEN} to recognise binary strings. Now @code{BETWEEN} is -case-sensitive. -@item -Added @code{--skip-thread-priority} option to @code{mysqld}, for systems -where @code{mysqld}'s thread scheduling doesn't work properly (BSDI 3.1). -@item -Added ODBC functions @code{DAYNAME()} and @code{MONTHNAME()}. -@item -Added function @code{TIME_FORMAT()}. This works like @code{DATE_FORMAT()}, -but takes a time string (@code{'HH:MM:DD'}) as argument. -@item -Fixed unlikely(?) key optimiser bug when using @code{OR}s of key parts -inside @code{AND}s. -@item -Added @code{variables} command to @code{mysqladmin}. -@item -A lot of small changes to the binary releases. -@item -Fixed a bug in the new protocol from MySQL Version 3.21.20. -@item -Changed @code{ALTER TABLE} to work with Windows (Windows can't rename -open files). Also fixed a couple of small bugs in the Windows version. -@item -All standard MySQL clients are now ported to MySQL-Windows. -@item -MySQL can now be started as a service on NT. -@end itemize - - -@node News-3.21.22, News-3.21.21a, News-3.21.23, News-3.21.x -@appendixsubsec Changes in release 3.21.22 - -@itemize @bullet -@item -Starting with this version, all MySQL distributions will be -configured, compiled and tested with @code{crash-me} and the benchmarks on -the following platforms: SunOS 5.6 sun4u, SunOS 5.5.1 sun4u, SunOS 4.14 sun4c, -SunOS 5.6 i86pc, Irix 6.3 mips5k, HP-UX 10.20 hppa, AIX 4.2.1 ppc, -OSF/1 V4.0 alpha, FreeBSD 2.2.2 i86pc and BSDI 3.1 i386. -@item -Fix @code{COUNT(*)} problems when the @code{WHERE} clause didn't match any -records. (Bug from 3.21.17.) -@item -Removed that @code{NULL = NULL} is true. Now you must use @code{IS NULL} -or @code{IS NOT NULL} to test whether a value is @code{NULL}. -(This is according to ANSI SQL but may break -old applications that are ported from @code{mSQL}.) -You can get the old behaviour by compiling with @code{-DmSQL_COMPLIANT}. -@item -Fixed bug that core dumped when using many @code{LEFT OUTER JOIN} clauses. -@item -Fixed bug in @code{ORDER BY} on string formula with possible @code{NULL} values. -@item -Fixed problem in range optimiser when using @code{<=} on sub index. -@item -Added functions @code{DAYOFYEAR()}, @code{DAYOFMONTH()}, @code{MONTH()}, -@code{YEAR()}, @code{WEEK()}, @code{QUARTER()}, @code{HOUR()}, @code{MINUTE()}, -@code{SECOND()} and @code{FIND_IN_SET()}. -@item -Added @code{SHOW VARIABLES} command. -@item -Added support of ``long constant strings'' from ANSI SQL: -@example -mysql> SELECT 'first ' 'second'; -> 'first second' -@end example -@item -Upgraded Msql-Mysql-modules to 1.1825. -@item -Upgraded @code{mysqlaccess} to 2.02. -@item -Fixed problem with Russian character set and @code{LIKE}. -@item -Ported to OpenBSD 2.1. -@item -New Dutch error messages. -@end itemize - - -@node News-3.21.21a, News-3.21.21, News-3.21.22, News-3.21.x -@appendixsubsec Changes in release 3.21.21a - -@itemize @bullet -@item -Configure changes for some operating systems. -@end itemize - - -@node News-3.21.21, News-3.21.20, News-3.21.21a, News-3.21.x -@appendixsubsec Changes in release 3.21.21 - -@itemize @bullet -@item -Fixed optimiser bug when using -@code{WHERE data_field = date_field2 AND date_field2 = constant}. -@item -Added @code{SHOW STATUS} command. -@item -Removed @file{manual.ps} from the source distribution to make it smaller. -@end itemize - - -@node News-3.21.20, News-3.21.19, News-3.21.21, News-3.21.x -@appendixsubsec Changes in release 3.21.20 - -@itemize @bullet -@item -Changed the maximum table name and column name lengths from 32 to 64. -@item -Aliases can now be of ``any'' length. -@item -Fixed @code{mysqladmin stat} to return the right number of queries. -@item -Changed protocol (downward compatible) to mark if a column has the -@code{AUTO_INCREMENT} attribute or is a @code{TIMESTAMP}. This is needed for -the new Java driver. -@item -Added Hebrew sorting order by Zeev Suraski. -@item -Solaris 2.6: Fixed @code{configure} bugs and increased maximum table size -from 2G to 4G. -@end itemize - - -@node News-3.21.19, News-3.21.18, News-3.21.20, News-3.21.x -@appendixsubsec Changes in release 3.21.19 - -@itemize @bullet -@item -Upgraded @code{DBD} to 1.1823. This version implements @code{mysql_use_result} -in @code{DBD-Mysql}. -@item -Benchmarks updated for empress (by Luuk). -@item -Fixed a case of slow range searching. -@item -Configure fixes (@file{Docs} directory). -@item -Added function @code{REVERSE()} (by Zeev Suraski). -@end itemize - - -@node News-3.21.18, News-3.21.17, News-3.21.19, News-3.21.x -@appendixsubsec Changes in release 3.21.18 - -@itemize @bullet -@item -Issue error message if client C functions are called in wrong order. -@item -Added automatic reconnect to the @file{libmysql.c} library. If a write command -fails, an automatic reconnect is done. -@item -Small sort sets no longer use temporary files. -@item -Upgraded @code{DBI} to 0.91. -@item -Fixed a couple of problems with @code{LEFT OUTER JOIN}. -@item -Added @code{CROSS JOIN} syntax. @code{CROSS} is now a reserved word. -@item -Recoded @code{yacc}/@code{bison} stack allocation to be even safer and to allow -MySQL to handle even bigger expressions. -@item -Fixed a couple of problems with the update log. -@item -@code{ORDER BY} was slow when used with key ranges. -@end itemize - - -@node News-3.21.17, News-3.21.16, News-3.21.18, News-3.21.x -@appendixsubsec Changes in release 3.21.17 - -@itemize @bullet -@item -Changed documentation string of @code{--with-unix-socket-path} to avoid -confusion. -@item -Added ODBC and ANSI SQL style @code{LEFT OUTER JOIN}. -@item -The following are new reserved words: @code{LEFT}, @code{NATURAL}, -@code{USING}. -@item -The client library now uses the value of the environment variable -@code{MYSQL_HOST} as the default host if it's defined. -@item -@code{SELECT col_name, SUM(expr)} now returns @code{NULL} for @code{col_name} -when there are matching rows. -@item -Fixed problem with comparing binary strings and @code{BLOB}s with ASCII -characters over 127. -@item -Fixed lock problem: when freeing a read lock on a table with multiple -read locks, a thread waiting for a write lock would have been given the lock. -This shouldn't affect data integrity, but could possibly make @code{mysqld} -restart if one thread was reading data that another thread modified. -@item -@code{LIMIT offset,count} didn't work in @code{INSERT ... SELECT}. -@item -Optimised key block caching. This will be quicker than the old algorithm when -using bigger key caches. -@end itemize - - -@node News-3.21.16, News-3.21.15, News-3.21.17, News-3.21.x -@appendixsubsec Changes in release 3.21.16 - -@itemize @bullet -@item -Added ODBC 2.0 & 3.0 functions @code{POWER()}, @code{SPACE()}, -@code{COT()}, @code{DEGREES()}, @code{RADIANS()}, @code{ROUND(2 arg)} -and @code{TRUNCATE()}. -@item -@strong{Warning: Incompatible change!} @code{LOCATE()} parameters were -swapped according to ODBC standard. Fixed. -@item -Added function @code{TIME_TO_SEC()}. -@item -In some cases, default values were not used for @code{NOT NULL} fields. -@item -Timestamp wasn't always updated properly in @code{UPDATE SET ...} statements. -@item -Allow empty strings as default values for @code{BLOB} and @code{TEXT}, to -be compatible with @code{mysqldump}. -@end itemize - - -@node News-3.21.15, News-3.21.14b, News-3.21.16, News-3.21.x -@appendixsubsec Changes in release 3.21.15 - -@itemize @bullet -@item -@strong{Warning: Incompatible change!} @code{mysqlperl} is now from -Msql-Mysql-modules. This means that @code{connect()} now takes -@code{host}, @code{database}, @code{user}, @code{password} arguments! The old -version took @code{host}, @code{database}, @code{password}, @code{user}. -@item -Allow @code{DATE '1997-01-01'}, @code{TIME '12:10:10'} and -@code{TIMESTAMP '1997-01-01 12:10:10'} formats required by ANSI SQL. -@strong{Warning: Incompatible change!} This has the unfortunate -side-effect that you no longer can have columns named @code{DATE}, @code{TIME} -or @code{TIMESTAMP}. :( Old columns can still be accessed through -@code{tablename.columnname}!) -@item -Changed Makefiles to hopefully work better with BSD systems. Also, -@file{manual.dvi} is now included in the distribution to avoid having stupid -@code{make} programs trying to rebuild it. -@item -@code{readline} library upgraded to version 2.1. -@item -A new sortorder german-1. That is a normal ISO-Latin1 with a german sort -order. -@item -Perl @code{DBI}/@code{DBD} is now included in the distribution. @code{DBI} -is now the recommended way to connect to MySQL from Perl. -@item -New portable benchmark suite with @code{DBD}, with test results from -@code{mSQL} 2.0.3, MySQL, PostgreSQL 6.2.1 and Solid server 2.2. -@item -@code{crash-me} is now included with the benchmarks; this is a Perl program -designed to find as many limits as possible in a SQL server. Tested with -@code{mSQL}, PostgreSQL, Solid and MySQL. -@item -Fixed bug in range-optimiser that crashed MySQL on some queries. -@item -Table and column name completion for @code{mysql} command-line tool, by Zeev -Suraski and Andi Gutmans. -@item -Added new command @code{REPLACE} that works like @code{INSERT} but -replaces conflicting records with the new record. @code{REPLACE INTO -TABLE ... SELECT ...} works also. -@item -Added new commands @code{CREATE DATABASE db_name} and @code{DROP -DATABASE db_name}. -@item -Added @code{RENAME} option to @code{ALTER TABLE}: @code{ALTER TABLE name -RENAME TO new_name}. -@item -@code{make_binary_distribution} now includes @file{libgcc.a} in -@file{libmysqlclient.a}. This should make linking work for people who don't -have @code{gcc}. -@item -Changed @code{net_write()} to @code{my_net_write()} because of a name -conflict with Sybase. -@item -@cindex ODBC compatibility -@cindex compatibility, with ODBC -New function @code{DAYOFWEEK()} compatible with ODBC. -@item -Stack checking and @code{bison} memory overrun checking to make MySQL -safer with weird queries. -@end itemize - - -@node News-3.21.14b, News-3.21.14a, News-3.21.15, News-3.21.x -@appendixsubsec Changes in release 3.21.14b - -@itemize @bullet -@item -Fixed a couple of small @code{configure} problems on some platforms. -@end itemize - - -@node News-3.21.14a, News-3.21.13, News-3.21.14b, News-3.21.x -@appendixsubsec Changes in release 3.21.14a - -@itemize @bullet -@item -Ported to SCO Openserver 5.0.4 with FSU Pthreads. -@item -HP-UX 10.20 should work. -@item -Added new function @code{DATE_FORMAT()}. -@item -Added @code{NOT IN}. -@item -Added automatic removal of 'ODBC function conversions': @code{@{fn now() @}} -@item -Handle ODBC 2.50.3 option flags. -@item -Fixed comparison of @code{DATE} and @code{TIME} values with @code{NULL}. -@item -Changed language name from germany to german to be consistent with -the other language names. -@item -Fixed sorting problem on functions returning a @code{FLOAT}. Previously, the -values were converted to @code{INT}s before sorting. -@item -Fixed slow sorting when sorting on key field when using -@code{key_column=constant}. -@item -Sorting on calculated @code{DOUBLE} values sorted on integer results instead. -@item -@code{mysql} no longer requires a database argument. -@item -Changed the place where @code{HAVING} should be. According to ANSI, it should -be after @code{GROUP BY} but before @code{ORDER BY}. MySQL Version 3.20 -incorrectly had it last. -@item -Added Sybase command @code{USE DATABASE} to start using another database. -@item -Added automatic adjusting of number of connections and table cache size -if the maximum number of files that can be opened is less than needed. -This should fix that @code{mysqld} doesn't crash even if you haven't done a -@code{ulimit -n 256} before starting @code{mysqld}. -@item -Added lots of limit checks to make it safer when running with too little -memory or when doing weird queries. -@end itemize - - -@node News-3.21.13, News-3.21.12, News-3.21.14a, News-3.21.x -@appendixsubsec Changes in release 3.21.13 - -@itemize @bullet -@item -Added retry of interrupted reads and clearing of @code{errno}. -This makes Linux systems much safer! -@item -Fixed locking bug when using many aliases on the same table in the same -@code{SELECT}. -@item -Fixed bug with @code{LIKE} on number key. -@item -New error message so you can check whether the connection was lost while -the command was running or whether the connection was down from the start. -@item -Added @code{--table} option to @code{mysql} to print in table format. -Moved time and row information after query result. -Added automatic reconnect of lost connections. -@item -Added @code{!=} as a synonym for @code{<>}. -@item -Added function @code{VERSION()} to make easier logs. -@item -New multi-user test @file{tests/fork_test.pl} to put some strain on the -thread library. -@end itemize - - -@node News-3.21.12, News-3.21.11, News-3.21.13, News-3.21.x -@appendixsubsec Changes in release 3.21.12 - -@itemize @bullet -@item -Fixed @code{ftruncate()} call in MIT-pthreads. This made @code{isamchk} -destroy the @file{.ISM} files on (Free)BSD 2.x systems. -@item -Fixed broken @code{__P_} patch in MIT-pthreads. -@item -Many memory overrun checks. All string functions now return @code{NULL} -if the returned string should be longer than @code{max_allowed_packet} bytes. -@item -Changed the name of the @code{INTERVAL} type to @code{ENUM}, because -@code{INTERVAL} is used in ANSI SQL. -@item -In some cases, doing a @code{JOIN} + @code{GROUP} + @code{INTO OUTFILE}, -the result wasn't grouped. -@item -@code{LIKE} with @code{'_'} as last character didn't work. Fixed. -@item -Added extended ANSI SQL @code{TRIM()} function. -@item -Added @code{CURTIME()}. -@item -Added @code{ENCRYPT()} function by Zeev Suraski. -@item -Fixed better @code{FOREIGN KEY} syntax skipping. New reserved words: -@code{MATCH}, @code{FULL}, @code{PARTIAL}. -@item -@code{mysqld} now allows IP number and hostname for the @code{--bind-address} -option. -@item -Added @code{SET CHARACTER SET cp1251_koi8} to enable conversions of -data to and from the @code{cp1251_koi8} character set. -@item -Lots of changes for Windows 95 port. In theory, this version should now be -easily portable to Windows 95. -@item -Changed the @code{CREATE COLUMN} syntax of @code{NOT NULL} columns to be after -the @code{DEFAULT} value, as specified in the ANSI SQL standard. This will -make @code{mysqldump} with @code{NOT NULL} and default values incompatible with -MySQL Version 3.20. -@item -Added many function name aliases so the functions can be used with -ODBC or ANSI SQL92 syntax. -@item -Fixed syntax of @code{ALTER TABLE tbl_name ALTER COLUMN col_name SET DEFAULT -NULL}. -@item -Added @code{CHAR} and @code{BIT} as synonyms for @code{CHAR(1)}. -@item -Fixed core dump when updating as a user who has only @code{SELECT} privilege. -@item -@code{INSERT ... SELECT ... GROUP BY} didn't work in some cases. An -@code{Invalid use of group function} error occurred. -@item -When using @code{LIMIT}, @code{SELECT} now always uses keys instead of record -scan. This will give better performance on @code{SELECT} and a @code{WHERE} -that matches many rows. -@item -Added Russian error messages. -@end itemize - - -@node News-3.21.11, News-3.21.10, News-3.21.12, News-3.21.x -@appendixsubsec Changes in release 3.21.11 - -@itemize @bullet -@item -Configure changes. -@item -MySQL now works with the new thread library on BSD/OS 3.0. -@item -Added new group functions @code{BIT_OR()} and @code{BIT_AND()}. -@item -Added compatibility functions @code{CHECK} and @code{REFERENCES}. -@code{CHECK} is now a reserved word. -@item -Added @code{ALL} option to @code{GRANT} for better compatibility. (@code{GRANT} -is still a dummy function.) -@item -Added partly-translated Dutch error messages. -@item -Fixed bug in @code{ORDER BY} and @code{GROUP BY} with @code{NULL} columns. -@item -Added function @code{LAST_INSERT_ID()} SQL function to retrieve last -@code{AUTO_INCREMENT} -value. This is intended for clients to ODBC that can't use the -@code{mysql_insert_id()} API function, but can be used by any client. -@item -Added @code{--flush-logs} option to @code{mysqladmin}. -@item -Added command @code{STATUS} to @code{mysql}. -@item -Fixed problem with @code{ORDER BY}/@code{GROUP BY} because of bug in @code{gcc}. -@item -Fixed problem with @code{INSERT ... SELECT ... GROUP BY}. -@end itemize - - -@node News-3.21.10, News-3.21.9, News-3.21.11, News-3.21.x -@appendixsubsec Changes in release 3.21.10 - -@itemize @bullet -@item -New @code{mysqlaccess}. -@item -@code{CREATE} now supports all ODBC types and the @code{mSQL} @code{TEXT} type. -All ODBC 2.5 functions are also supported (added @code{REPEAT}). This provides -better portability. -@item -Added text types @code{TINYTEXT}, @code{TEXT}, @code{MEDIUMTEXT} and -@code{LONGTEXT}. These are actually @code{BLOB}types, but all searching is -done in case-insensitive fashion. -@item -All old @code{BLOB} fields are now @code{TEXT} fields. This only -changes that all searching on strings is done in case-sensitive fashion. -You must do an @code{ALTER TABLE} and change the field type to @code{BLOB} -if you want to have tests done in case-sensitive fashion. -@item -Fixed some @code{configure} issues. -@item -Made the locking code a bit safer. Fixed very unlikely -deadlock situation. -@item -Fixed a couple of bugs in the range optimiser. Now the new range benchmark -@code{test-select} works. -@end itemize - - -@node News-3.21.9, News-3.21.8, News-3.21.10, News-3.21.x -@appendixsubsec Changes in release 3.21.9 - -@itemize @bullet -@item -Added @code{--enable-unix-socket=pathname} option to @code{configure}. -@item -Fixed a couple of portability problems with include files. -@item -Fixed bug in range calculation that could return empty -set when searching on multiple key with only one entry (very rare). -@item -Most things ported to FSU Pthreads, which should allow MySQL to -run on Caldera (SCO). @xref{Caldera}. -@end itemize - - -@node News-3.21.8, News-3.21.7, News-3.21.9, News-3.21.x -@appendixsubsec Changes in release 3.21.8 - -@itemize @bullet -@item -Works now in Solaris 2.6. -@item -Added handling of calculation of @code{SUM()} functions. -For example, you can now use @code{SUM(column)/COUNT(column)}. -@item -Added handling of trigometric functions: -@code{PI()}, @code{ACOS()}, @code{ASIN()}, @code{ATAN()}, @code{COS()}, -@code{SIN()} and @code{TAN()}. -@item -New languages: norwegian, norwegian-ny and portuguese. -@item -Fixed parameter bug in @code{net_print()} in @file{procedure.cc}. -@item -Fixed a couple of memory leaks. -@item -Now allow also the old @code{SELECT ... INTO OUTFILE} syntax. -@item -Fixed bug with @code{GROUP BY} and @code{SELECT} on key with many values. -@item -@code{mysql_fetch_lengths()} sometimes returned incorrect lengths when you used -@code{mysql_use_result()}. This affected at least some cases of -@code{mysqldump --quick}. -@item -Fixed bug in optimisation of @code{WHERE const op field}. -@item -Fixed problem when sorting on @code{NULL} fields. -@item -Fixed a couple of 64-bit (Alpha) problems. -@item -Added @code{--pid-file=#} option to @code{mysqld}. -@item -Added date formatting to @code{FROM_UNIXTIME()}, originally by Zeev Suraski. -@item -Fixed bug in @code{BETWEEN} in range optimiser (did only test = of the first -argument). -@item -Added machine-dependent files for MIT-pthreads i386-SCO. There is probably -more to do to get this to work on SCO 3.5. -@end itemize - - -@node News-3.21.7, News-3.21.6, News-3.21.8, News-3.21.x -@appendixsubsec Changes in release 3.21.7 - -@itemize @bullet -@item -Changed @file{Makefile.am} to take advantage of Automake 1.2. -@item -Added the beginnings of a benchmark suite. -@item -Added more secure password handling. -@item -Added new client function @code{mysql_errno()}, to get the error number of -the error message. This makes error checking in the client much easier. -This makes the new server incompatible with the 3.20.x server when running -without @code{--old-protocol}. The client code is backward-compatible. -More information can be found in the @file{README} file! -@item -Fixed some problems when using very long, illegal names. -@end itemize - - -@node News-3.21.6, News-3.21.5, News-3.21.7, News-3.21.x -@appendixsubsec Changes in release 3.21.6 - -@itemize @bullet -@item -Fixed more portability issues (incorrect @code{sigwait} and @code{sigset} -defines). -@item -@code{configure} should now be able to detect the last argument to -@code{accept()}. -@end itemize - - -@node News-3.21.5, News-3.21.4, News-3.21.6, News-3.21.x -@appendixsubsec Changes in release 3.21.5 - -@itemize @bullet -@item -Should now work with FreeBSD 3.0 if used with -@file{FreeBSD-3.0-libc_r-1.0.diff}, -which can be found at @uref{http://www.mysql.com/Downloads/Patches/}. -@item -Added new @code{-O tmp_table_size=#} option to @code{mysqld}. -@item -New function @code{FROM_UNIXTIME(timestamp)} which returns a date string in -@code{'YYYY-MM-DD HH:MM:DD'} format. -@item -New function @code{SEC_TO_TIME(seconds)} which returns a string in -@code{'HH:MM:SS'} format. -@item -New function @code{SUBSTRING_INDEX()}, originally by Zeev Suraski. -@end itemize - - -@node News-3.21.4, News-3.21.3, News-3.21.5, News-3.21.x -@appendixsubsec Changes in release 3.21.4 - -@itemize @bullet -@item -Should now configure and compile on OSF/1 4.0 with the DEC compiler. -@item -Configuration and compilation on BSD/OS 3.0 works, but due to some bugs in -BSD/OS 3.0, @code{mysqld} doesn't work on it yet. -@item -Configuration and compilation on FreeBSD 3.0 works, but I couldn't get -@code{pthread_create} to work. -@end itemize - - -@node News-3.21.3, News-3.21.2, News-3.21.4, News-3.21.x -@appendixsubsec Changes in release 3.21.3 - -@itemize @bullet -@item -Added reverse check lookup of hostnames to get better security. -@item -Fixed some possible buffer overflows if filenames that are too long are used. -@item -@code{mysqld} doesn't accept hostnames that start with digits followed by a -@code{'.'}, because the hostname may look like an IP number. -@item -Added @code{--skip-networking} option to @code{mysqld}, to allow only socket -connections. (This will not work with MIT-pthreads!) -@item -Added check of too long table names for alias. -@item -Added check if database name is okay. -@item -Added check if too long table names. -@item -Removed incorrect @code{free()} that killed the server on -@code{CREATE DATABASE} or @code{DROP DATABASE}. -@item -Changed some @code{mysqld} @code{-O} options to better names. -@item -Added @code{-O join_cache_size=#} option to @code{mysqld}. -@item -Added @code{-O max_join_size=#} option to @code{mysqld}, to be able to set a -limit how big queries (in this case big = slow) one should be able to handle -without specifying @code{SET SQL_BIG_SELECTS=1}. A # = is about 10 -examined records. The default is ``unlimited''. -@item -When comparing a @code{TIME}, @code{DATE}, @code{DATETIME} or @code{TIMESTAMP} -column to a constant, the constant is converted to a time value before -performing the comparison. -This will make it easier to get ODBC (particularly Access97) to work with -the above types. It should also make dates easier to use and the comparisons -should be quicker than before. -@item -Applied patch from Jochen Wiedmann that allows @code{query()} in -@code{mysqlperl} to take a query with @code{\0} in it. -@item -Storing a timestamp with a 2-digit year (@code{YYMMDD}) didn't work. -@item -Fix that timestamp wasn't automatically updated if set in an @code{UPDATE} -clause. -@item -Now the automatic timestamp field is the FIRST timestamp field. -@item -@code{SELECT * INTO OUTFILE}, which didn't correctly if the outfile already -existed. -@item -@code{mysql} now shows the thread ID when starting or doing a reconnect. -@item -Changed the default sort buffer size from 2M to 1M. -@end itemize - - -@node News-3.21.2, News-3.21.0, News-3.21.3, News-3.21.x -@appendixsubsec Changes in release 3.21.2 - -@itemize @bullet -@item -The range optimiser is coded, but only 85% tested. It can be enabled with -@code{--new}, but it crashes core a lot yet... -@item -More portable. Should compile on AIX and alpha-digital. -At least the @code{isam} library should be relatively 64-bit clean. -@item -New @code{isamchk} which can detect and fix more problems. -@item -New options for @code{isamlog}. -@item -Using new version of Automake. -@item -Many small portability changes (from the AIX and alpha-digital port) -Better checking of pthread(s) library. -@item -czech error messages by @email{snajdr@@pvt.net}. -@item -Decreased size of some buffers to get fewer problems on systems with little -memory. Also added more checks to handle ``out of memory'' problems. -@item -@code{mysqladmin}: you can now do @code{mysqladmin kill 5,6,7,8} to kill -multiple threads. -@item -When the maximum connection limit is reached, one extra connection by a user -with the @strong{process_acl} privilege is granted. -@item -Added @code{-O backlog=#} option to @code{mysqld}. -@item -Increased maximum packet size from 512K to 1024K for client. -@item -Almost all of the function code is now tested in the internal test suite. -@item -@code{ALTER TABLE} now returns warnings from field conversions. -@item -Port changed to 3306 (got it reserved from ISI). -@item -Added a fix for Visual FoxBase so that any schema name from a table -specification is automatically removed. -@item -New function @code{ASCII()}. -@item -Removed function @code{BETWEEN(a,b,c)}. Use the standard ANSI -syntax instead: @code{expr BETWEEN expr AND expr}. -@item -MySQL no longer has to use an extra temporary table when sorting -on functions or @code{SUM()} functions. -@item -Fixed bug that you couldn't use @code{tbl_name.field_name} in @code{UPDATE}. -@item -Fixed @code{SELECT DISTINCT} when using 'hidden group'. For example: -@example -mysql> SELECT DISTINCT MOD(some_field,10) FROM test - -> GROUP BY some_field; -@end example -Note: @code{some_field} is normally in the @code{SELECT} part. ANSI SQL should -require it. -@end itemize - - -@node News-3.21.0, , News-3.21.2, News-3.21.x -@appendixsubsec Changes in release 3.21.0 - -@itemize @bullet -@item -New reserved words used: @code{INTERVAL}, @code{EXPLAIN}, @code{READ}, -@code{WRITE}, @code{BINARY}. -@item -Added ODBC function @code{CHAR(num,...)}. -@item -New operator @code{IN}. This uses a binary search to find a match. -@item -New command @code{LOCK TABLES tbl_name [AS alias] @{READ|WRITE@} ...} -@item -Added @code{--log-update} option to @code{mysqld}, to get a log suitable for -incremental updates. -@item -New command @code{EXPLAIN SELECT ...} to get information about how the -optimiser will do the join. -@item -For easier client code, the client should no longer use -@code{FIELD_TYPE_TINY_BLOB}, @code{FIELD_TYPE_MEDIUM_BLOB}, -@code{FIELD_TYPE_LONG_BLOB} or @code{FIELD_TYPE_VAR_STRING} (as -previously returned by @code{mysql_list_fields}). You should instead only use -@code{FIELD_TYPE_BLOB} or @code{FIELD_TYPE_STRING}. If you want exact -types, you should use the command @code{SHOW FIELDS}. -@item -Added varbinary syntax: @code{0x######} which can be used as a string -(default) or a number. -@item -@code{FIELD_TYPE_CHAR} is renamed to @code{FIELD_TYPE_TINY}. -@item -Changed all fields to C++ classes. -@item -Removed FORM struct. -@item -Fields with @code{DEFAULT} values no longer need to be @code{NOT NULL}. -@item -New field types: -@table @code -@item ENUM -A string which can take only a couple of defined values. The value is -stored as a 1-3 byte number that is mapped automatically to a string. -This is sorted according to string positions! -@item SET -A string which may have one or many string values separated with ','. -The string is stored as a 1-, 2-, 3-, 4- or 8-byte number where each bit stands -for a specific set member. This is sorted according to the unsigned value -of the stored packed number. -@end table -@item -Now all function calculation is done with @code{double} or @code{long long}. -This will provide the full 64-bit range with bit functions and fix some -conversions that previously could result in precision losses. One should -avoid using @code{unsigned long long} columns with full 64-bit range -(numbers bigger than 9223372036854775807) because calculations are done -with @code{signed long long}. -@item -@code{ORDER BY} will now put @code{NULL} field values first. @code{GROUP BY} -will also work with @code{NULL} values. -@item -Full @code{WHERE} with expressions. -@item -New range optimiser that can resolve ranges when some keypart prefix is -constant. Example: -@example -mysql> SELECT * FROM tbl_name - -> WHERE key_part_1="customer" - -> AND key_part_2>=10 AND key_part_2<=10; -@end example -@end itemize - - -@node News-3.20.x, News-3.19.x, News-3.21.x, News -@appendixsec Changes in release 3.20.x - -@cindex changes, version 3.20 - -Version 3.20 is quite old now, and should be avoided if possible. This -information is kept here for historical purposes only. - -Changes from 3.20.18 to 3.20.32b are not documented here because the -3.21 release branched here. And the relevant changes are also -documented as changes to the 3.21 version. - -@menu -* News-3.20.18:: Changes in release 3.20.18 -* News-3.20.17:: Changes in release 3.20.17 -* News-3.20.16:: Changes in release 3.20.16 -* News-3.20.15:: Changes in release 3.20.15 -* News-3.20.14:: Changes in release 3.20.14 -* News-3.20.13:: Changes in release 3.20.13 -* News-3.20.11:: Changes in release 3.20.11 -* News-3.20.10:: Changes in release 3.20.10 -* News-3.20.9:: Changes in release 3.20.9 -* News-3.20.8:: Changes in release 3.20.8 -* News-3.20.7:: Changes in release 3.20.7 -* News-3.20.6:: Changes in release 3.20.6 -* News-3.20.3:: Changes in release 3.20.3 -* News-3.20.0:: Changes in releases 3.20.0 -@end menu - - -@node News-3.20.18, News-3.20.17, News-3.20.x, News-3.20.x -@appendixsubsec Changes in release 3.20.18 - -@itemize @bullet -@item -Added @code{-p#} (remove @code{#} directories from path) to @code{isamlog}. -All files are written with a relative path from the database directory -Now @code{mysqld} shouldn't crash on shutdown when using the -@code{--log-isam} option. -@item -New @code{mysqlperl} version. It is now compatible with @code{msqlperl-0.63}. -@item -New @code{DBD} module available at @uref{http://www.mysql.com/Downloads/Contrib/} -site. -@item -Added group function @code{STD()} (standard deviation). -@item -The @code{mysqld} server is now compiled by default without debugging -information. This will make the daemon smaller and faster. -@item -Now one usually only has to specify the @code{--basedir} option to -@code{mysqld}. All other paths are relative in a normal installation. -@item -@code{BLOB} columns sometimes contained garbage when used with a @code{SELECT} -on more than one table and @code{ORDER BY}. -@item -Fixed that calculations that are not in @code{GROUP BY} work as expected -(ANSI SQL extension). -Example: -@example -mysql> SELECT id,id+1 FROM table GROUP BY id; -@end example -@item -The test of using @code{MYSQL_PWD} was reversed. Now @code{MYSQL_PWD} is -enabled as default in the default release. -@item -Fixed conversion bug which caused @code{mysqld} to core dump with -Arithmetic error on SPARC-386. -@item -Added @code{--unbuffered} option to @code{mysql}, for new @code{mysqlaccess}. -@item -When using overlapping (unnecessary) keys and join over many tables, -the optimiser could get confused and return 0 records. -@end itemize - - -@node News-3.20.17, News-3.20.16, News-3.20.18, News-3.20.x -@appendixsubsec Changes in release 3.20.17 - -@itemize @bullet -@item -You can now use @code{BLOB} columns and the functions @code{IS NULL} and -@code{IS NOT NULL} in the @code{WHERE} clause. -@item -All communication packets and row buffers are now allocated dynamically -on demand. The default value of @code{max_allowed_packet} is now 64K for -the server and 512K for the client. This is mainly used to catch -incorrect packets that could trash all memory. The server limit may be -changed when it is started. -@item -Changed stack usage to use less memory. -@item -Changed @code{safe_mysqld} to check for running daemon. -@item -The @code{ELT()} function is renamed to @code{FIELD()}. The new -@code{ELT()} function returns a value based on an index: @code{FIELD()} -is the inverse of @code{ELT()} Example: @code{ELT(2,"A","B","C")} returns -@code{"B"}. @code{FIELD("B","A","B","C")} returns @code{2}. -@item -@code{COUNT(field)}, where @code{field} could have a @code{NULL} value, now -works. -@item -A couple of bugs fixed in @code{SELECT ... GROUP BY}. -@item -Fixed memory overrun bug in @code{WHERE} with many unoptimisable brace levels. -@item -Fixed some small bugs in the grant code. -@item -If hostname isn't found by @code{get_hostname}, only the IP is checked. -Previously, you got @code{Access denied}. -@item -Inserts of timestamps with values didn't always work. -@item -@code{INSERT INTO ... SELECT ... WHERE} could give the error -@code{Duplicated field}. -@item -Added some tests to @code{safe_mysqld} to make it ``safer''. -@item -@code{LIKE} was case-sensitive in some places and case-insensitive in others. -Now @code{LIKE} is always case-insensitive. -@item -@file{mysql.cc}: Allow @code{'#'} anywhere on the line. -@item -New command @code{SET SQL_SELECT_LIMIT=#}. See the FAQ for more details. -@item -New version of the @code{mysqlaccess} script. -@item -Change @code{FROM_DAYS()} and @code{WEEKDAY()} to also take a full -@code{TIMESTAMP} or @code{DATETIME} as argument. Before they only took a -number of type @code{YYYYMMDD} or @code{YYMMDD}. -@item -Added new function @code{UNIX_TIMESTAMP(timestamp_column)}. -@end itemize - - -@node News-3.20.16, News-3.20.15, News-3.20.17, News-3.20.x -@appendixsubsec Changes in release 3.20.16 - -@itemize @bullet -@item -More changes in MIT-pthreads to get them safer. Fixed also some link -bugs at least in SunOS. -@item -Changed @code{mysqld} to work around a bug in MIT-pthreads. This makes multiple -small @code{SELECT} operations 20 times faster. Now @code{lock_test.pl} should -work. -@item -Added @code{mysql_FetchHash(handle)} to @code{mysqlperl}. -@item -The @code{mysqlbug} script is now distributed built to allow for reporting -bugs that appear during the build with it. -@item -Changed @file{libmysql.c} to prefer @code{getpwuid()} instead of -@code{cuserid()}. -@item -Fixed bug in @code{SELECT} optimiser when using many tables with the same -column used as key to different tables. -@item -Added new @code{latin2} and Russian @code{KOI8} character tables. -@item -Added support for a dummy @code{GRANT} command to satisfy Powerbuilder. -@end itemize - - -@node News-3.20.15, News-3.20.14, News-3.20.16, News-3.20.x -@appendixsubsec Changes in release 3.20.15 - -@itemize @bullet -@item -Fixed fatal bug @code{packets out of order} when using MIT-pthreads. -@item -Removed possible loop when a thread waits for command from client -and @code{fcntl()} fails. Thanks to Mike Bretz for finding this bug. -@item -Changed alarm loop in @file{mysqld.cc} because shutdown didn't always -succeed in Linux. -@item -Removed use of @code{termbits} from @file{mysql.cc}. This conflicted with -@code{glibc} 2.0. -@item -Fixed some syntax errors for at least BSD and Linux. -@item -Fixed bug when doing a @code{SELECT} as superuser without a database. -@item -Fixed bug when doing @code{SELECT} with group calculation to outfile. -@end itemize - - -@node News-3.20.14, News-3.20.13, News-3.20.15, News-3.20.x -@appendixsubsec Changes in release 3.20.14 - -@itemize @bullet -@item -If one gives @code{-p} or @code{--password} option to @code{mysql} without -an argument, the user is solicited for the password from the tty. -@item -Added default password from @code{MYSQL_PWD} (by Elmar Haneke). -@item -Added command @code{kill} to @code{mysqladmin} to kill a specific -MySQL thread. -@item -Sometimes when doing a reconnect on a down connection this succeeded -first on second try. -@item -Fixed adding an @code{AUTO_INCREMENT} key with @code{ALTER_TABLE}. -@item -@code{AVG()} gave too small value on some @code{SELECT}s with -@code{GROUP BY} and @code{ORDER BY}. -@item -Added new @code{DATETIME} type (by Giovanni Maruzzelli -@email{maruzz@@matrice.it}). -@item -Fixed that defining @code{DONT_USE_DEFAULT_FIELDS} works. -@item -Changed to use a thread to handle alarms instead of signals on Solaris to -avoid race conditions. -@item -Fixed default length of signed numbers. (George Harvey -@email{georgeh@@pinacl.co.uk}.) -@item -Allow anything for @code{CREATE INDEX}. -@item -Add prezeros when packing numbers to @code{DATE}, @code{TIME} and -@code{TIMESTAMP}. -@item -Fixed a bug in @code{OR} of multiple tables (gave empty set). -@item -Added many patches to MIT-pthreads. This fixes at least one lookup bug. -@end itemize - - -@node News-3.20.13, News-3.20.11, News-3.20.14, News-3.20.x -@appendixsubsec Changes in release 3.20.13 - -@itemize @bullet -@item -Added ANSI SQL94 @code{DATE} and @code{TIME} types. -@item -Fixed bug in @code{SELECT} with @code{AND}-@code{OR} levels. -@item -Added support for Slovenian characters. The @file{Contrib} directory contains -source and instructions for adding other character sets. -@item -Fixed bug with @code{LIMIT} and @code{ORDER BY}. -@item -Allow @code{ORDER BY} and @code{GROUP BY} on items that aren't in the -@code{SELECT} list. -(Thanks to Wim Bonis @email{bonis@@kiss.de}, for pointing this out.) -@item -Allow setting of timestamp values in @code{INSERT}. -@item -Fixed bug with @code{SELECT ... WHERE ... = NULL}. -@item -Added changes for @code{glibc} 2.0. To get @code{glibc} to work, you should -add the @file{gibc-2.0-sigwait-patch} before compiling @code{glibc}. -@item -Fixed bug in @code{ALTER TABLE} when changing a @code{NOT NULL} field to -allow @code{NULL} values. -@item -Added some ANSI92 synonyms as field types to @code{CREATE TABLE}. -@code{CREATE TABLE} now allows @code{FLOAT(4)} and @code{FLOAT(8)} to mean -@code{FLOAT} and @code{DOUBLE}. -@item -New utility program @code{mysqlaccess} by @email{Yves.Carlier@@rug.ac.be}. -This program shows the access rights for a specific user and the grant -rows that determine this grant. -@item -Added @code{WHERE const op field} (by @email{bonis@@kiss.de}). -@end itemize - - -@node News-3.20.11, News-3.20.10, News-3.20.13, News-3.20.x -@appendixsubsec Changes in release 3.20.11 - -@itemize @bullet -@item -When using @code{SELECT ... INTO OUTFILE}, all temporary tables are ISAM -instead of HEAP to allow big dumps. -@item -Changed date functions to be string functions. This fixed some ``funny'' -side effects when sorting on dates. -@item -Extended @code{ALTER TABLE} according to SQL92. -@item -Some minor compatibility changes. -@item -Added @code{--port} and @code{--socket} options to all utility programs and -@code{mysqld}. -@item -Fixed MIT-pthreads @code{readdir_r()}. Now @code{mysqladmin create database} -and @code{mysqladmin drop database} should work. -@item -Changed MIT-pthreads to use our @code{tempnam()}. This should fix the ``sort -aborted'' bug. -@item -Added sync of records count in @code{sql_update}. This fixed slow updates -on first connection. (Thanks to Vaclav Bittner for the test.) -@end itemize - - -@node News-3.20.10, News-3.20.9, News-3.20.11, News-3.20.x -@appendixsubsec Changes in release 3.20.10 - -@itemize @bullet -@item -New insert type: @code{INSERT INTO ... SELECT ...} -@item -@code{MEDIUMBLOB} fixed. -@item -Fixed bug in @code{ALTER TABLE} and @code{BLOB}s. -@item -@code{SELECT ... INTO OUTFILE} now creates the file in the current -database directory. -@item -@code{DROP TABLE} now can take a list of tables. -@item -Oracle synonym @code{DESCRIBE} (@code{DESC}). -@item -Changes to @code{make_binary_distribution}. -@item -Added some comments to installation instructions about @code{configure}'s -C++ link test. -@item -Added @code{--without-perl} option to @code{configure}. -@item -Lots of small portability changes. -@end itemize - - -@node News-3.20.9, News-3.20.8, News-3.20.10, News-3.20.x -@appendixsubsec Changes in release 3.20.9 - -@itemize @bullet -@item -@code{ALTER TABLE} didn't copy null bit. As a result, fields that were allowed -to have @code{NULL} values were always @code{NULL}. -@item -@code{CREATE} didn't take numbers as @code{DEFAULT}. -@item -Some compatibility changes for SunOS. -@item -Removed @file{config.cache} from old distribution. -@end itemize - - -@node News-3.20.8, News-3.20.7, News-3.20.9, News-3.20.x -@appendixsubsec Changes in release 3.20.8 - -@itemize @bullet -@item -Fixed bug with @code{ALTER TABLE} and multi-part keys. -@end itemize - - -@node News-3.20.7, News-3.20.6, News-3.20.8, News-3.20.x -@appendixsubsec Changes in release 3.20.7 - -@itemize @bullet -@item -New commands: @code{ALTER TABLE}, @code{SELECT ... INTO OUTFILE} and -@code{LOAD DATA INFILE}. -@item -New function: @code{NOW()}. -@item -Added new field @code{File_priv} to @code{mysql/user} table. -@item -New script @code{add_file_priv} which adds the new field @code{File_priv} -to the @code{user} table. This script must be executed if you want to -use the new @code{SELECT ... INTO} and @code{LOAD DATA INFILE ...} commands -with a version of MySQL earlier than 3.20.7. -@item -Fixed bug in locking code, which made @code{lock_test.pl} test fail. -@item -New files @file{NEW} and @file{BUGS}. -@item -Changed @file{select_test.c} and @file{insert_test.c} to include -@file{config.h}. -@item -Added @code{status} command to @code{mysqladmin} for short logging. -@item -Increased maximum number of keys to 16 and maximum number of key parts to 15. -@item -Use of sub keys. A key may now be a prefix of a string field. -@item -Added @code{-k} option to @code{mysqlshow}, to get key information for a table. -@item -Added long options to @code{mysqldump}. -@end itemize - - -@node News-3.20.6, News-3.20.3, News-3.20.7, News-3.20.x -@appendixsubsec Changes in release 3.20.6 - -@itemize @bullet -@item -Portable to more systems because of MIT-pthreads, which will -be used automatically if @code{configure} cannot find a @code{-lpthreads} -library. -@item -Added GNU-style long options to almost all programs. Test with -@code{@kbd{program} --help}. -@item -Some shared library support for Linux. -@item -The FAQ is now in @file{.texi} format and is available in @file{.html}, -@file{.txt} and @file{.ps} formats. -@item -Added new SQL function @code{RAND([init])}. -@item -Changed @code{sql_lex} to handle @code{\0} unquoted, but the client can't send -the query through the C API, because it takes a str pointer. -You must use @code{mysql_real_query()} to send the query. -@item -Added API function @code{mysql_get_client_info()}. -@item -@code{mysqld} now uses the @code{N_MAX_KEY_LENGTH} from @file{nisam.h} as -the maximum allowable key length. -@item -The following now works: -@example -mysql> SELECT filter_nr,filter_nr FROM filter ORDER BY filter_nr; -@end example -Previously, this resulted in the error: -@code{Column: 'filter_nr' in order clause is ambiguous}. -@item -@code{mysql} now outputs @code{'\0'}, @code{'\t'}, @code{'\n'} and @code{'\\'} -when encountering ASCII 0, tab, newline or @code{'\'} while writing -tab-separated output. -This is to allow printing of binary data in a portable format. -To get the old behaviour, use @code{-r} (or @code{--raw}). -@item -Added german error messages (60 of 80 error messages translated). -@item -Added new API function @code{mysql_fetch_lengths(MYSQL_RES *)}, which -returns an array of column lengths (of type @code{uint}). -@item -Fixed bug with @code{IS NULL} in @code{WHERE} clause. -@item -Changed the optimiser a little to get better results when searching on a key -part. -@item -Added @code{SELECT} option @code{STRAIGHT_JOIN} to tell the optimiser that -it should join tables in the given order. -@item -Added support for comments starting with @code{'--'} in @file{mysql.cc} -(Postgres syntax). -@item -You can have @code{SELECT} expressions and table columns in a @code{SELECT} -which are not used in the group part. This makes it efficient to implement -lookups. The column that is used should be a constant for each group because -the value is calculated only once for the first row that is found for a group. -@example -mysql> SELECT id,lookup.text,SUM(*) FROM test,lookup - -> WHERE test.id=lookup.id GROUP BY id; -@end example -@item -Fixed bug in @code{SUM(function)} (could cause a core dump). -@item -Changed @code{AUTO_INCREMENT} placement in the SQL query: -@example -INSERT INTO table (auto_field) VALUES (0); -@end example -inserted 0, but it should insert an @code{AUTO_INCREMENT} value. -@item -@file{mysqlshow.c}: Added number of records in table. Had to change the -client code a little to fix this. -@item -@code{mysql} now allows doubled @code{''} or @code{""} within strings for -embedded @code{'} or @code{"}. -@item -New math functions: -@code{EXP()}, @code{LOG()}, @code{SQRT()}, @code{ROUND()}, @code{CEILING()}. -@end itemize - - -@node News-3.20.3, News-3.20.0, News-3.20.6, News-3.20.x -@appendixsubsec Changes in release 3.20.3 - -@itemize @bullet -@item -The @code{configure} source now compiles a thread-free client library -@code{-lmysqlclient}. This is the only library that needs to be linked -with client applications. When using the binary releases, you must -link with @code{-lmysql -lmysys -ldbug -lmystrings} as before. -@item -New @code{readline} library from @code{bash-2.0}. -@item -LOTS of small changes to @code{configure} and makefiles (and related source). -@item -It should now be possible to compile in another directory using -@code{VPATH}. Tested with GNU Make 3.75. -@item -@code{safe_mysqld} and @code{mysql.server} changed to be more compatible -between the source and the binary releases. -@item -@code{LIMIT} now takes one or two numeric arguments. -If one argument is given, it indicates the maximum number of rows in -a result. If two arguments are given, the first argument indicates the offset -of the first row to return, the second is the maximum number of rows. -With this it's easy to do a poor man's next page/previous page WWW -application. -@item -Changed name of SQL function @code{FIELDS()} to @code{ELT()}. -Changed SQL function @code{INTERVALL()} to @code{INTERVAL()}. -@item -Made @code{SHOW COLUMNS} a synonym for @code{SHOW FIELDS}. -Added compatibility syntax @code{FRIEND KEY} to @code{CREATE TABLE}. In -MySQL, this creates a non-unique key on the given columns. -@item -Added @code{CREATE INDEX} and @code{DROP INDEX} as compatibility functions. -In MySQL, @code{CREATE INDEX} only checks if the index exists and -issues an error if it doesn't exist. @code{DROP INDEX} always succeeds. -@item -@file{mysqladmin.c}: added client version to version information. -@item -Fixed core dump bug in @code{sql_acl} (core on new connection). -@item -Removed @code{host}, @code{user} and @code{db} tables from database @code{test} -in the distribution. -@item -@code{FIELD_TYPE_CHAR} can now be signed (-128 to 127) or unsigned (0 to 255) -Previously, it was always unsigned. -@item -Bug fixes in @code{CONCAT()} and @code{WEEKDAY()}. -@item -Changed a lot of source to get @code{mysqld} to be compiled with SunPro -compiler. -@item -SQL functions must now have a @code{'('} immediately after the function name -(no intervening space). -For example, @code{'USER('} is regarded as beginning a function call, and -@code{'USER ('} is regarded as an identifier @code{USER} followed by a -@code{'('}, not as a function call. -@end itemize - - -@node News-3.20.0, , News-3.20.3, News-3.20.x -@appendixsubsec Changes in release 3.20.0 - -@itemize @bullet -@item -The source distribution is done with @code{configure} and Automake. -It will make porting much easier. The @code{readline} library is included -in the distribution. -@item -Separate client compilation: -the client code should be very easy to compile on systems which -don't have threads. -@item -The old Perl interface code is automatically compiled and installed. -Automatic compiling of @code{DBD} will follow when the new @code{DBD} code -is ported. -@item -Dynamic language support: @code{mysqld} can now be started with Swedish -or English (default) error messages. -@item -New functions: @code{INSERT()}, @code{RTRIM()}, @code{LTRIM()} and -@code{FORMAT()}. -@item -@code{mysqldump} now works correctly for all field types (even -@code{AUTO_INCREMENT}). The format for @code{SHOW FIELDS FROM tbl_name} -is changed so the @code{Type} column contains information suitable for -@code{CREATE TABLE}. In previous releases, some @code{CREATE TABLE} -information had to be patched when re-creating tables. -@item -Some parser bugs from 3.19.5 (@code{BLOB} and @code{TIMESTAMP}) are corrected. -@code{TIMESTAMP} now returns different date information depending on its -create length. -@item -Changed parser to allow a database, table or field name to -start with a number or @code{'_'}. -@item -All old C code from Unireg changed to C++ and cleaned up. This makes -the daemon a little smaller and easier to understand. -@item -A lot of small bug fixes done. -@item -New @file{INSTALL} files (not final version) and some information regarding porting. -@end itemize - - -@node News-3.19.x, , News-3.20.x, News -@appendixsec Changes in release 3.19.x - -@cindex changes, version 3.19 - -Version 3.19 is quite old now, and should be avoided if possible. This -information is kept here for historical purposes only. - -@menu -* News-3.19.5:: Changes in release 3.19.5 -* News-3.19.4:: Changes in release 3.19.4 -* News-3.19.3:: Changes in release 3.19.3 -@end menu - - -@node News-3.19.5, News-3.19.4, News-3.19.x, News-3.19.x -@appendixsubsec Changes in release 3.19.5 - -@itemize @bullet -@item -Some new functions, some more optimisation on joins. -@item -Should now compile clean on Linux (2.0.x). -@item -Added functions @code{DATABASE()}, @code{USER()}, @code{POW()}, -@code{LOG10()} (needed for ODBC). -@item -In a @code{WHERE} with an @code{ORDER BY} on fields from only one table, -the table is now preferred as first table in a multi-join. -@item -@code{HAVING} and @code{IS NULL} or @code{IS NOT NULL} now works. -@item -A group on one column and a sort on a group function (@code{SUM()}, -@code{AVG()}...) didn't work together. Fixed. -@item -@code{mysqldump}: Didn't send password to server. -@end itemize - - -@node News-3.19.4, News-3.19.3, News-3.19.5, News-3.19.x -@appendixsubsec Changes in release 3.19.4 - -@itemize @bullet -@item -Fixed horrible locking bug when inserting in one thread and reading -in another thread. -@item -Fixed one-off decimal bug. 1.00 was output as 1.0. -@item -Added attribute @code{'Locked'} to process list as info if a query is -locked by another query. -@item -Fixed full magic timestamp. Timestamp length may now be 14, 12, 10, 8, 6, 4 -or 2 bytes. -@item -Sort on some numeric functions could sort incorrectly on last number. -@item -@code{IF(arg,syntax_error,syntax_error)} crashed. -@item -Added functions @code{CEILING()}, @code{ROUND()}, @code{EXP()}, @code{LOG()} and @code{SQRT()}. -@item -Enhanced @code{BETWEEN} to handle strings. -@end itemize - - -@node News-3.19.3, , News-3.19.4, News-3.19.x -@appendixsubsec Changes in release 3.19.3 - -@itemize @bullet -@item -Fixed @code{SELECT} with grouping on @code{BLOB} columns not to return -incorrect @code{BLOB} info. Grouping, sorting and distinct on @code{BLOB} -columns will not yet work as -expected (probably it will group/sort by the first 7 characters in the -@code{BLOB}). Grouping on formulas with a fixed string size (use @code{MID()} -on a @code{BLOB}) should work. -@item -When doing a full join (no direct keys) on multiple tables with @code{BLOB} -fields, the @code{BLOB} was garbage on output. -@item -Fixed @code{DISTINCT} with calculated columns. -@end itemize - - - - - -@node Porting, Environment variables, News, Top -@appendix Porting to Other Systems - -@cindex porting, to other systems - -This appendix will help you port MySQL to other operationg systems. -Do check the list of currently supported operating systems first. -@xref{Which OS}. -If you have created a new port of MySQL, please let us know so that -we can list it here and on our web site (@uref{http://www.mysql.com/}), -recommending it to other users. - -Note: If you create a new port of MySQL, you are free to copy and -distribute it under the GPL license, but it does not make you a -copyright holder of MySQL. - -A working Posix thread library is needed for the server. On Solaris 2.5 -we use Sun PThreads (the native thread support in 2.4 and earlier -versions are not good enough) and on Linux we use LinuxThreads by Xavier -Leroy, @email{Xavier.Leroy@@inria.fr}. - -The hard part of porting to a new Unix variant without good native -thread support is probably to port MIT-pthreads. See -@file{mit-pthreads/README} and Programming POSIX Threads -(@uref{http://www.humanfactor.com/pthreads/}). - -The MySQL distribution includes a patched version of -Provenzano's Pthreads from MIT (see the MIT Pthreads web page at -@uref{http://www.mit.edu:8001/people/proven/pthreads.html}). -This can be used for some operating systems that do not -have POSIX threads. - -It is also possible to use another user level thread package named -FSU Pthreads (see -@uref{http://www.informatik.hu-berlin.de/~mueller/pthreads.html, FSU Pthreads -home page}). This implementation is being used for the SCO port. - -See the @file{thr_lock.c} and @file{thr_alarm.c} programs in the @file{mysys} -directory for some tests/examples of these problems. - -Both the server and the client need a working C++ compiler (we use @code{gcc} -and have tried SPARCworks). Another compiler that is known to work is the -Irix @code{cc}. - -To compile only the client use @code{./configure --without-server}. - -There is currently no support for only compiling the server, nor is it -likly to be added unless someone has a good reason for it. - -If you want/need to change any @file{Makefile} or the configure script you must -get Automake and Autoconf. We have used the @code{automake-1.2} and -@code{autoconf-2.12} distributions. - -All steps needed to remake everything from the most basic files. - -@example -/bin/rm */.deps/*.P -/bin/rm -f config.cache -aclocal -autoheader -aclocal -automake -autoconf -./configure --with-debug=full --prefix='your installation directory' - -# The makefiles generated above need GNU make 3.75 or newer. -# (called gmake below) -gmake clean all install init-db -@end example - -If you run into problems with a new port, you may have to do some debugging -of MySQL! -@xref{Debugging server}. - -@strong{Note}: before you start debugging @code{mysqld}, first get the test -programs @code{mysys/thr_alarm} and @code{mysys/thr_lock} to work. This -will ensure that your thread installation has even a remote chance to work! - -@menu -* Debugging server:: Debugging a MySQL server -* Debugging client:: Debugging a MySQL client -* The DBUG package:: The DBUG Package -* Locking methods:: Locking ethods -* RTS-threads:: Comments about RTS threads -* Thread packages:: Differences between different thread packages -@end menu - - -@node Debugging server, Debugging client, Porting, Porting -@appendixsec Debugging a MySQL server - -@cindex server, debugging -@cindex debugging, server -@cindex crash - -If you are using some functionality that is very new in MySQL, -you can try to run @code{mysqld} with the @code{--skip-new} (which will disable all -new, potentially unsafe functionality) or with @code{--safe-mode} which -disables a lot of optimisation that may cause problems. -@xref{Crashing}. - -If @code{mysqld} doesn't want to start, you should check that you don't have -any @file{my.cnf} files that interfere with your setup! -You can check your @file{my.cnf} arguments with @code{mysqld --print-defaults} -and avoid using them by starting with @code{mysqld --no-defaults ...}. - -If @code{mysqld} starts to eat up CPU or memory or if it ``hangs'', you -can use @code{mysqladmin processlist status} to find out if someone is -executing a query that takes a long time. It may be a good idea to -run @code{mysqladmin -i10 processlist status} in some window if you are -experiencing performance problems or problems when new clients can't connect. - -The command @code{mysqladmin debug} will dump some information about -locks in use, used memory and query usage to the mysql log file. This -may help solve some problems. This command also provides some useful -information even if you haven't compiled MySQL for debugging! - -If the problem is that some tables are getting slower and slower you -should try to optimise the table with @code{OPTIMIZE TABLE} or -@code{myisamchk}. @xref{MySQL Database Administration}. You should also -check the slow queries with @code{EXPLAIN}. - -You should also read the OS-specific section in this manual for -problems that may be unique to your environment. -@xref{Operating System Specific Notes}. - -@menu -* Compiling for debugging:: Compiling MYSQL for debugging -* Making trace files:: Creating trace files -* Using gdb on mysqld:: Debugging mysqld under gdb -* Using stack trace:: Using a stack trace -* Using log files:: Using log files to find cause of errors in mysqld -* Reproduceable test case:: Making a test case when you experience table corruption -@end menu - - -@node Compiling for debugging, Making trace files, Debugging server, Debugging server -@appendixsubsec Compiling MYSQL for Debugging - -If you have some very specific problem, you can always try to debug -MySQL. To do this you must configure MySQL with the -@code{--with-debug} or the @code{--with-debug=full} option. You can check -whether MySQL was compiled with debugging by doing: -@code{mysqld --help}. If the @code{--debug} flag is listed with the -options then you have debugging enabled. @code{mysqladmin ver} also -lists the @code{mysqld} version as @code{mysql ... --debug} in this case. - -If you are using gcc or egcs, the recommended configure line is: - -@example -CC=gcc CFLAGS="-O2" CXX=gcc CXXFLAGS="-O2 -felide-constructors \ - -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql \ - --with-debug --with-extra-charsets=complex -@end example - -This will avoid problems with the @code{libstdc++} library and with C++ -exceptions (many compilers have problems with C++ exceptions in threaded -code) and compile a MySQL version with support for all character sets. - -If you suspect a memory overrun error, you can configure MySQL -with @code{--with-debug=full}, which will install a memory allocation -(@code{SAFEMALLOC}) checker. Running with @code{SAFEMALLOC} is however -quite slow, so if you get performance problems you should start -@code{mysqld} with the @code{--skip-safemalloc} option. This will -disable the memory overrun checks for each call to @code{malloc} and -@code{free}. - -If @code{mysqld} stops crashing when you compile it with -@code{--with-debug}, you have probably found a compiler bug or a timing -bug within MySQL. In this case you can try to add @code{-g} to -the @code{CFLAGS} and @code{CXXFLAGS} variables above and not use -@code{--with-debug}. If @code{mysqld} now dies, you can at least attach -to it with @code{gdb} or use @code{gdb} on the core file to find out -what happened. - -When you configure MySQL for debugging you automatically enable a -lot of extra safety check functions that monitor the health of @code{mysqld}. -If they find something ``unexpected,'' an entry will be written to -@code{stderr}, which @code{safe_mysqld} directs to the error log! This also -means that if you are having some unexpected problems with MySQL and -are using a source distribution, the first thing you should do is to -configure MySQL for debugging! (The second thing, of course, is to -send mail to @email{mysql@@lists.mysql.com} and ask for help. Please use the -@code{mysqlbug} script for all bug reports or questions regarding the -MySQL version you are using! - -In the Windows MySQL distribution, @code{mysqld.exe} is by -default compiled with support for trace files. - - -@node Making trace files, Using gdb on mysqld, Compiling for debugging, Debugging server -@appendixsubsec Creating Trace Files - -If the @code{mysqld} server doesn't start or if you can cause the -@code{mysqld} server to crash quickly, you can try to create a trace -file to find the problem. - -To do this you have to have a @code{mysqld} that is compiled for debugging. -You can check this by executing @code{mysqld -V}. If the version number -ends with @code{-debug}, it's compiled with support for trace files. - -Start the @code{mysqld} server with a trace log in @file{/tmp/mysqld.trace} -(or @file{C:\mysqld.trace} on Windows): - -@code{mysqld --debug} - -On Windows you should also use the @code{--standalone} flag to not start -@code{mysqld} as a service: - -In a DOS window do: - -@example -mysqld --debug --standalone -@end example - -After this you can use the @code{mysql.exe} command-line tool in a -second DOS window to reproduce the problem. You can take down the above -@code{mysqld} server with @code{mysqladmin shutdown}. - -Note that the trace file will get @strong{very big}! -If you want to have a smaller trace file, you can use something like: - -@code{mysqld --debug=d,info,error,query,general,where:O,/tmp/mysqld.trace} - -which only prints information with the most interesting tags in -@file{/tmp/mysqld.trace}. - -If you make a bug report about this, please only send the lines from the -trace file to the appropriate mailing list where something seems to go -wrong! If you can't locate the wrong place, you can ftp the trace file, -together with a full bug report, to -@uref{ftp://support.mysql.com/pub/mysql/secret/} so that a MySQL -developer can take a look a this. - -The trace file is made with the @strong{DBUG} package by Fred Fish. -@xref{The DBUG package}. - - -@node Using gdb on mysqld, Using stack trace, Making trace files, Debugging server -@appendixsubsec Debugging mysqld under gdb - -@cindex gdb, using - -On most systems you can also start @code{mysqld} from @code{gdb} to get -more information if @code{mysqld} crashes. - -With some older @code{gdb} versions on Linux you must use @code{run ---one-thread} if you want to be able to debug @code{mysqld} threads. In -this case you can only have one thread active at a time. We recommend you -to upgrade to gdb 5.1 ASAP as thread debugging works much better with this -version! - -When running @code{mysqld} under gdb, you should disable the stack trace -with @code{--skip-stack-trace} to be able to catch segfaults within gdb. - -It's very hard to debug MySQL under @code{gdb} if you do a lot of -new connections the whole time as @code{gdb} doesn't free the memory for -old threads. You can avoid this problem by starting @code{mysqld} with -@code{-O thread_cache_size= 'max_connections +1'}. In most cases just -using @code{-O thread_cache_size=5'} will help a lot! - -If you want to get a core dump on Linux if @code{mysqld} dies with a -SIGSEGV signal, you can start @code{mysqld} with the @code{--core-file} option. -This core file can be used to make a backtrace that may help you -find out why @code{mysqld} died: - -@example -shell> gdb mysqld core -gdb> backtrace full -gdb> exit -@end example - -@xref{Crashing}. - -If you are using gdb 4.17.x or above on Linux, you should install a -@file{.gdb} file, with the following information, in your current -directory: - -@example -set print sevenbit off -handle SIGUSR1 nostop noprint -handle SIGUSR2 nostop noprint -handle SIGWAITING nostop noprint -handle SIGLWP nostop noprint -handle SIGPIPE nostop -handle SIGALRM nostop -handle SIGHUP nostop -handle SIGTERM nostop noprint -@end example - -If you have problems debugging threads with gdb, you should download -gdb 5.x and try this instead. The new gdb version has very improved -thread handling! - -Here is an example how to debug mysqld: - -@example -shell> gdb /usr/local/libexec/mysqld -gdb> run -... -backtrace full # Do this when mysqld crashes -@end example - -Include the above output in a mail generated with @code{mysqlbug} and -mail this to @code{mysql@@lists.mysql.com}. - -If @code{mysqld} hangs you can try to use some system tools like -@code{strace} or @code{/usr/proc/bin/pstack} to examine where -@code{mysqld} has hung. - -@example -strace /tmp/log libexec/mysqld -@end example - -@findex DBI->trace -@findex trace DBI method -@tindex DBI_TRACE environment variable -@tindex Environment variable, DBI_TRACE -If you are using the Perl @code{DBI} interface, you can turn on -debugging information by using the @code{trace} method or by -setting the @code{DBI_TRACE} environment variable. -@xref{Perl DBI Class, , Perl @code{DBI} Class}. - - -@node Using stack trace, Using log files, Using gdb on mysqld, Debugging server -@appendixsubsec Using a Stack Trace - -On some operating systems, the error log will contain a stack trace if -@code{mysqld} dies unexpectedly. You can use this to find out where (and -maybe why) @code{mysqld} died. @xref{Error log}. To get a stack trace, -you must not compile @code{mysqld} with the @code{-fomit-frame-pointer} -option to gcc. @xref{Compiling for debugging}. - -If the error file contains something like the following: - -@example -mysqld got signal 11; -The manual section 'Debugging a MySQL server' tells you how to use a -stack trace and/or the core file to produce a readable backtrace that may -help in finding out why mysqld died -Attemping backtrace. You can use the following information to find out -where mysqld died. If you see no messages after this, something went -terribly wrong -stack range sanity check, ok, backtrace follows -0x40077552 -0x81281a0 -0x8128f47 -0x8127be0 -0x8127995 -0x8104947 -0x80ff28f -0x810131b -0x80ee4bc -0x80c3c91 -0x80c6b43 -0x80c1fd9 -0x80c1686 -@end example - -you can find where @code{mysqld} died by doing the following: - -@enumerate -@item -Copy the above numbers to a file, for example @file{mysqld.stack}. - -@item -Make a symbol file for the @code{mysqld} server: -@example -nm -n libexec/mysqld > /tmp/mysqld.sym -@end example - -Note that many MySQL binary distributions comes with the above -file, named @code{mysqld.sym.gz}. In this case you must unpack this by -doing: -@example -gunzip < bin/mysqld.sym.gz > /tmp/mysqld.sym -@end example - -@item -Execute @code{resolve_stack_dump -s /tmp/mysqld.sym -n mysqld.stack}. - -This will print out where @code{mysqld} died. If this doesn't help you -find out why @code{mysqld} died, you should make a bug report and include -the output from the above commend with the bug report. - -Note however that in most cases it will not help us to just have a stack -trace to find the reason for the problem. To be able to locate the bug -or provide a workaround, we would in most cases need to know the query -that killed @code{mysqld} and preferable a test case so that we can -repeat the problem! @xref{Bug reports}. -@end enumerate - - -@node Using log files, Reproduceable test case, Using stack trace, Debugging server -@appendixsubsec Using Log Files to Find Cause of Errors in mysqld - -Note that before starting @code{mysqld} with @code{--log} you should -check all your tables with @code{myisamchk}. -@xref{MySQL Database Administration}. - -If @code{mysqld} dies or hangs, you should start @code{mysqld} with -@code{--log}. When @code{mysqld} dies again, you can examine the end of -the log file for the query that killed @code{mysqld}. - -If you are using @code{--log} without a file name, the log is stored in -the database directory as 'hostname'.log In most cases it's the last -query in the log file that killed @code{mysqld}, but if possible you -should verify this by restarting @code{mysqld} and executing the found -query from the @code{mysql} command-line tools. If this works, you -should also test all complicated queries that didn't complete. - -You can also try the command @code{EXPLAIN} on all @code{SELECT} -statements that takes a long time to ensure that @code{mysqld} is using -indexes properly. @xref{EXPLAIN, , @code{EXPLAIN}}. - -You can find the queries that take a long time to execute by starting -@code{mysqld} with @code{--log-slow-queries}. @xref{Slow query log}. - -If you find the text @code{mysqld restarted} in the error log file -(normally named @file{hostname.err}) you have probably found a query -that causes @code{mysqld} to fail. If this happens you should check all -your tables with @code{myisamchk} (@pxref{MySQL Database Administration}), -and test the queries in the MySQL log files to see if one doesn't -work. If you find such a query, try first upgrading to the newest -MySQL version. If this doesn't help and you can't find anything -in the @code{mysql} mail archive, you should report the bug to -@email{mysql@@lists.mysql.com}. Links to mail archives are available -online at @uref{http://lists.mysql.com/}. - -If you have started @code{mysqld} with @code{myisam-recover}, -MySQL will automatically check and try to repair @code{MyISAM} -tables if they are marked as 'not closed properly' or 'crashed'. If -this happens, MySQL will write an entry in the -@code{hostname.err} file @code{'Warning: Checking table ...'} which is -followed by @code{Warning: Repairing table} if the table needs to be -repaired. If you get a lot of these errors, without @code{mysqld} having -died unexpectedly just before, then something is wrong and needs to -be investigated further. @xref{Command-line options}. - -It's of course not a good sign if @code{mysqld} did died unexpectedly, -but in this case one shouldn't investigate the @code{Checking table...} -messages but instead try to find out why @code{mysqld} died. - - -@node Reproduceable test case, , Using log files, Debugging server -@appendixsubsec Making a Test Case When You Experience Table Corruption - -If you get corrupted tables or if @code{mysqld} always fails after some -update commands, you can test if this bug is reproducible by doing the -following: - -@itemize @bullet -@item -Take down the MySQL daemon (with @code{mysqladmin shutdown}). -@item -Make a backup of the tables (to guard against the very unlikely case that -the repair will do something bad). -@item -Check all tables with @code{myisamchk -s database/*.MYI}. Repair any -wrong tables with @code{myisamchk -r database/table.MYI}. -@item -Make a second backup of the tables. -@item -Remove (or move away) any old log files from the MySQL data -directory if you need more space. -@item -Start @code{mysqld} with @code{--log-bin}. @xref{Binary log}. -If you want to find a query that crashes @code{mysqld}, you should use -@code{--log --log-bin}. -@item -When you have gotten a crashed table, stop the @code{mysqld server}. -@item -Restore the backup. -@item -Restart the @code{mysqld} server @strong{without} @code{--log-bin} -@item -Re-execute the commands with @code{mysqlbinlog update-log-file | mysql}. -The update log is saved in the MySQL database directory with -the name @code{hostname-bin.#}. -@item -If the tables are corrupted again or you can get @code{mysqld} to die with the -above command, you have found reproducible bug that should be easy to -fix! FTP the tables and the binary log to -@uref{ftp://support.mysql.com/pub/mysql/secret/} and send a mail to -@email{bugs@@lists.mysql.com} or (if you are a support customer) to -@email{support@@mysql.com} about the problem and the MySQL team -will fix it as soon as possible. -@end itemize - -You can also use the script @code{mysql_find_rows} to just execute some of the -update statements if you want to narrow down the problem. - - -@node Debugging client, The DBUG package, Debugging server, Porting -@appendixsec Debugging a MySQL client - -@cindex debugging, client -@cindex clients, debugging - -To be able to debug a MySQL client with the integrated debug package, -you should configure MySQL with @code{--with-debug} or -@code{--with-debug=full}. @xref{configure options}. - -@tindex MYSQL_DEBUG environment variable -@tindex Environment variable, MYSQL_DEBUG -Before running a client, you should set the @code{MYSQL_DEBUG} environment -variable: - -@example -shell> MYSQL_DEBUG=d:t:O,/tmp/client.trace -shell> export MYSQL_DEBUG -@end example - -This causes clients to generate a trace file in @file{/tmp/client.trace}. - -If you have problems with your own client code, you should attempt to -connect to the server and run your query using a client that is known to -work. Do this by running @code{mysql} in debugging mode (assuming you -have compiled MySQL with debugging on): - -@example -shell> mysql --debug=d:t:O,/tmp/client.trace -@end example - -This will provide useful information in case you mail a bug report. -@xref{Bug reports}. - -If your client crashes at some 'legal' looking code, you should check -that your @file{mysql.h} include file matches your mysql library file. -A very common mistake is to use an old @file{mysql.h} file from an old -MySQL installation with new MySQL library. - - -@node The DBUG package, Locking methods, Debugging client, Porting -@appendixsec The DBUG Package - -@cindex DBUG package - -The MySQL server and most MySQL clients are compiled -with the DBUG package originally made by Fred Fish. When one has configured -MySQL for debugging, this package makes it possible to get a trace -file of what the program is debugging. @xref{Making trace files}. - -One uses the debug package by invoking the program with the -@code{--debug="..."} or the @code{-#...} option. - -Most MySQL programs has a default debug string that will be -used if you don't specify an option to @code{--debug}. The default -trace file is usually @code{/tmp/programname.trace} on Unix and -@code{\programname.trace} on Windows. - -The debug control string is a sequence of colon separated fields -as follows: - -@example -<field_1>:<field_2>:...:<field_N> -@end example - -Each field consists of a mandatory flag character followed by -an optional "," and comma-separated list of modifiers: - -@example -flag[,modifier,modifier,...,modifier] -@end example - -The currently recognised flag characters are: - -@multitable @columnfractions .05 .95 -@item @strong{Flag} @tab @strong{Description} -@item d @tab Enable output from DBUG_<N> macros for the current state. May be followed by a list of keywords which selects output only for the DBUG macros with that keyword. An empty list of keywords implies output for all macros. -@item D @tab Delay after each debugger output line. The argument is the number of tenths of seconds to delay, subject to machine capabilities. That is, @code{-#D,20} is delay two seconds. -@item f @tab Limit debugging and/or tracing, and profiling to the list of named functions. Note that a null list will disable all functions. The appropriate "d" or "t" flags must still be given, this flag only limits their actions if they are enabled. -@item F @tab Identify the source file name for each line of debug or trace output. -@item i @tab Identify the process with the pid or thread id for each line of debug or trace output. -@item g @tab Enable profiling. Create a file called 'dbugmon.out' containing information that can be used to profile the program. May be followed by a list of keywords that select profiling only for the functions in that list. A null list implies that all functions are considered. -@item L @tab Identify the source file line number for each line of debug or trace output. -@item n @tab Print the current function nesting depth for each line of debug or trace output. -@item N @tab Number each line of dbug output. -@item o @tab Redirect the debugger output stream to the specified file. The default output is stderr. -@item O @tab As @code{O} but the file is really flushed between each write. When needed the file is closed and reopened between each write. -@item p @tab Limit debugger actions to specified processes. A process must be identified with the DBUG_PROCESS macro and match one in the list for debugger actions to occur. -@item P @tab Print the current process name for each line of debug or trace output. -@item r @tab When pushing a new state, do not inherit the previous state's function nesting level. Useful when the output is to start at the left margin. -@item S @tab Do function _sanity(_file_,_line_) at each debugged function until _sanity() returns something that differs from 0. (Mostly used with safemalloc to find memory leaks) -@item t @tab Enable function call/exit trace lines. May be followed by a list (containing only one modifier) giving a numeric maximum trace level, beyond which no output will occur for either debugging or tracing macros. The default is a compile time option. -@end multitable - -Some examples of debug control strings which might appear on a shell -command-line (the "-#" is typically used to introduce a control string -to an application program) are: - -@example --#d:t --#d:f,main,subr1:F:L:t,20 --#d,input,output,files:n --#d:t:i:O,\\mysqld.trace -@end example - -In MySQL, common tags to print (with the @code{d} option) are: -@code{enter},@code{exit},@code{error},@code{warning},@code{info} and -@code{loop}. - - -@node Locking methods, RTS-threads, The DBUG package, Porting -@appendixsec Locking methods - -@cindex locking methods -@cindex methods, locking - -Currently MySQL only supports table locking for -@code{ISAM}/@code{MyISAM} and @code{HEAP} tables, -page-level locking for @code{BDB} tables and -row-level locking for @code{InnoDB} tables. -@xref{Internal locking}. -With @code{MyISAM} tables one can freely mix @code{INSERT} and -@code{SELECT} without locks (@code{Versioning}). - -Starting in version 3.23.33, you can analyse the table lock contention -on your system by checking @code{Table_locks_waited} and -@code{Table_locks_immediate} environment variables. - -To decide if you want to use a table type with row-level locking, -you will want to look at what the application does and what the -select/update pattern of the data is. - -Pros for row locking: - -@itemize @bullet -@item -Fewer lock conflicts when accessing different rows in many threads. -@item -Fewer changes for rollbacks. -@item -Makes it possible to lock a single row a long time. -@end itemize - -Cons: - -@itemize @bullet -@item -Takes more memory than page level or table locks. -@item -Is slower than page level or table locks when used on a big part of the table, -because one has to do many more locks. -@item -Is definitely much worse than other locks if you do often do @code{GROUP -BY} on a large part of the data or if one has to often scan the whole table. -@item -With higher level locks one can also more easily support locks of -different types to tune the application as the lock overhead is less -notable as for row level locks. -@end itemize - -Table locks are superior to page level / row level locks in the -following cases: - -@itemize @bullet -@item -Mostly reads -@item -Read and updates on strict keys; this is where one updates or deletes -a row that can be fetched with one key read: -@example -UPDATE table_name SET column=value WHERE unique_key# -DELETE FROM table_name WHERE unique_key=# -@end example -@item -@code{SELECT} combined with @code{INSERT} (and very few @code{UPDATE}s -and @code{DELETE}s. -@item -Many scans / @code{GROUP BY} on the whole table without any writers. -@end itemize - -Other options than row / page level locking: - -Versioning (like we use in MySQL for concurrent inserts) where -you can have one writer at the same time as many readers. This means -that the database/table supports different views for the data depending -on when one started to access it. Other names for this are time travel, -copy on write or copy on demand. - -Copy on demand is in many case much better than page or row level -locking; the worst case does, however, use much more memory than -when using normal locks. - -Instead of using row level locks one can use application level locks -(like get_lock/release_lock in MySQL). This works of course -only in well-behaved applications. - -In many cases one can do an educated guess which locking type is best -for the application, but generally it's very hard to say that a given -lock type is better than another; everything depends on the application -and different part of the application may require different lock types. - -Here are some tips about locking in MySQL: - -Most web applications do lots of selects, very few -deletes, updates mainly on keys, and inserts in some specific tables. -The base MySQL setup is very well tuned for this. - -Concurrent users are not a problem if one doesn't mix updates with selects -that need to examine many rows in the same table. - -If one mixes inserts and deletes on the same table then @code{INSERT DELAYED} -may be of great help. - -One can also use @code{LOCK TABLES} to speed up things (many updates within -a single lock is much faster than updates without locks). Splitting -thing to different tables will also help. - -If you get speed problems with the table locks in MySQL, you -may be able to solve these by converting some of your tables to @code{InnoDB} -or @code{BDB} tables. -@xref{InnoDB}. @xref{BDB}. - -The optimisation section in the manual covers a lot of different aspects of -how to tune applications. @xref{Tips}. - - -@node RTS-threads, Thread packages, Locking methods, Porting -@appendixsec Comments about RTS threads - -@cindex RTS-threads -@cindex threads, RTS - -I have tried to use the RTS thread packages with MySQL but -stumbled on the following problems: - -They use an old version of a lot of POSIX calls and it is very tedious to -make wrappers for all functions. I am inclined to think that it would -be easier to change the thread libraries to the newest POSIX -specification. - -Some wrappers are already written. See @file{mysys/my_pthread.c} for more info. - -At least the following should be changed: - -@code{pthread_get_specific} should use one argument. -@code{sigwait} should take two arguments. -A lot of functions (at least @code{pthread_cond_wait}, -@code{pthread_cond_timedwait}) -should return the error code on error. Now they return -1 and set @code{errno}. - -Another problem is that user-level threads use the @code{ALRM} signal and this -aborts a lot of functions (@code{read}, @code{write}, @code{open}...). -MySQL should do a retry on interrupt on all of these but it is -not that easy to verify it. - -The biggest unsolved problem is the following: - -To get thread-level alarms I changed @file{mysys/thr_alarm.c} to wait between -alarms with @code{pthread_cond_timedwait()}, but this aborts with error -@code{EINTR}. I tried to debug the thread library as to why this happens, -but couldn't find any easy solution. - -If someone wants to try MySQL with RTS threads I suggest the -following: - -@itemize @bullet -@item -Change functions MySQL uses from the thread library to POSIX. -This shouldn't take that long. -@item -Compile all libraries with the @code{-DHAVE_rts_threads}. -@item -Compile @code{thr_alarm}. -@item -If there are some small differences in the implementation, they may be fixed -by changing @file{my_pthread.h} and @file{my_pthread.c}. -@item -Run @code{thr_alarm}. If it runs without any ``warning'', ``error'' or aborted -messages, you are on the right track. Here is a successful run on -Solaris: -@example -Main thread: 1 -Thread 0 (5) started -Thread: 5 Waiting -process_alarm -Thread 1 (6) started -Thread: 6 Waiting -process_alarm -process_alarm -thread_alarm -Thread: 6 Slept for 1 (1) sec -Thread: 6 Waiting -process_alarm -process_alarm -thread_alarm -Thread: 6 Slept for 2 (2) sec -Thread: 6 Simulation of no alarm needed -Thread: 6 Slept for 0 (3) sec -Thread: 6 Waiting -process_alarm -process_alarm -thread_alarm -Thread: 6 Slept for 4 (4) sec -Thread: 6 Waiting -process_alarm -thread_alarm -Thread: 5 Slept for 10 (10) sec -Thread: 5 Waiting -process_alarm -process_alarm -thread_alarm -Thread: 6 Slept for 5 (5) sec -Thread: 6 Waiting -process_alarm -process_alarm - -... -thread_alarm -Thread: 5 Slept for 0 (1) sec -end -@end example -@end itemize - - -@node Thread packages, , RTS-threads, Porting -@appendixsec Differences between different thread packages - -@cindex thread packages, differences between - -MySQL is very dependent on the thread package used. So when -choosing a good platform for MySQL, the thread package is very -important. - -There are at least three types of thread packages: - -@itemize @bullet -@item -User threads in a single process. Thread switching is managed with -alarms and the threads library manages all non-thread-safe functions -with locks. Read, write and select operations are usually managed with a -thread-specific select that switches to another thread if the running -threads have to wait for data. If the user thread packages are -integrated in the standard libs (FreeBSD and BSDI threads) the thread -package requires less overhead than thread packages that have to map all -unsafe calls (MIT-pthreads, FSU Pthreads and RTS threads). In some -environments (for example, SCO), all system calls are thread-safe so the -mapping can be done very easily (FSU Pthreads on SCO). Downside: All -mapped calls take a little time and it's quite tricky to be able to -handle all situations. There are usually also some system calls that are -not handled by the thread package (like MIT-pthreads and sockets). Thread -scheduling isn't always optimal. -@item -User threads in separate processes. Thread switching is done by the -kernel and all data are shared between threads. The thread package -manages the standard thread calls to allow sharing data between threads. -LinuxThreads is using this method. Downside: Lots of processes. Thread -creating is slow. If one thread dies the rest are usually left hanging -and you must kill them all before restarting. Thread switching is -somewhat expensive. -@item -Kernel threads. Thread switching is handled by the thread library or the -kernel and is very fast. Everything is done in one process, but on some -systems, @code{ps} may show the different threads. If one thread aborts, the -whole process aborts. Most system calls are thread-safe and should -require very little overhead. Solaris, HP-UX, AIX and OSF/1 have kernel -threads. -@end itemize - -In some systems kernel threads are managed by integrating user -level threads in the system libraries. In such cases, the thread -switching can only be done by the thread library and the kernel isn't -really ``thread aware''. - - - - -@node Environment variables, Regexp, Porting, Top -@appendix Environment Variables - -@cindex environment variables, list of - -Here is a list of all the environment variables that are used directly or -indirectly by MySQL. Most of these can also be found in other -places in this manual. - -Note that any options on the command-line will take precedence over -values specified in configuration files and environment variables, and -values in configuration files take precedence over values in environment -variables. - -In many cases it's preferable to use a configure file instead of environment -variables to modify the behaviour of MySQL. @xref{Option files}. - -@tindex CCX environment variable -@tindex Environment variable, CCX -@tindex CC environment variable -@tindex Environment variable, CC -@tindex CFLAGS environment variable -@tindex Environment variable, CFLAGS -@tindex CXXFLAGS environment variable -@tindex Environment variable, CXXFLAGS -@tindex DBI_USER environment variable -@tindex Environment variable, DBI_USER -@tindex DBI_TRACE environment variable -@tindex Environment variable, DBI_TRACE -@tindex HOME environment variable -@tindex Environment variable, HOME -@tindex LD_RUN_PATH environment variable -@tindex Environment variable, LD_RUN_PATH -@tindex MYSQL_DEBUG environment variable -@tindex Environment variable, MYSQL_DEBUG -@tindex MYSQL_HISTFILE environment variable -@tindex Environment variable, MYSQL_HISTFILE -@tindex MYSQL_HOST environment variable -@tindex Environment variable, MYSQL_HOST -@tindex MYSQL_PS1 environment variable -@tindex Environment variable, MYSQL_PS1 -@tindex MYSQL_PWD environment variable -@tindex Environment variable, MYSQL_PWD -@tindex MYSQL_TCP_PORT environment variable -@tindex Environment variable, MYSQL_TCP_PORT -@tindex MYSQL_UNIX_PORT environment variable -@tindex Environment variable, MYSQL_UNIX_PORT -@tindex PATH environment variable -@tindex Environment variable, PATH -@tindex TMPDIR environment variable -@tindex Environment variable, TMPDIR -@tindex TZ environment variable -@tindex Environment variable, TZ -@tindex UMASK_DIR environment variable -@tindex Environment variable, UMASK_DIR -@tindex UMASK environment variable -@tindex Environment variable, UMASK -@tindex USER environment variable -@tindex Environment variable, USER - -@multitable @columnfractions .25 .70 -@item @strong{Variable} @tab @strong{Description} -@item @code{CCX} @tab Set this to your C++ compiler when running configure. -@item @code{CC} @tab Set this to your C compiler when running configure. -@item @code{CFLAGS} @tab Flags for your C compiler when running configure. -@item @code{CXXFLAGS} @tab Flags for your C++ compiler when running configure. -@item @code{DBI_USER} @tab The default user name for Perl DBI. -@item @code{DBI_TRACE} @tab Used when tracing Perl DBI. -@item @code{HOME} @tab The default path for the @code{mysql} history file is @file{$HOME/.mysql_history}. -@item @code{LD_RUN_PATH} @tab Used to specify where your @file{libmysqlclient.so} is. -@item @code{MYSQL_DEBUG} @tab Debug-trace options when debugging. -@item @code{MYSQL_HISTFILE} @tab The path to the @code{mysql} history file. -@item @code{MYSQL_HOST} @tab Default host name used by the @code{mysql} command-line client. -@item @code{MYSQL_PS1} @tab Command prompt to use in the @code{mysql} command-line client. @xref{mysql}. -@item @code{MYSQL_PWD} @tab The default password when connecting to @code{mysqld}. Note that use of this is insecure! -@item @code{MYSQL_TCP_PORT} @tab The default TCP/IP port. -@item @code{MYSQL_UNIX_PORT} @tab The default socket; used for connections to @code{localhost}. -@item @code{PATH} @tab Used by the shell to finds the MySQL programs. -@item @code{TMPDIR} @tab The directory where temporary tables/files are created. -@item @code{TZ} @tab This should be set to your local time zone. @xref{Timezone problems}. -@item @code{UMASK_DIR} @tab The user-directory creation mask when creating directories. Note that this is ANDed with @code{UMASK}! -@item @code{UMASK} @tab The user-file creation mask when creating files. -@item @code{USER} @tab The default user on Windows to use when connecting to @code{mysqld}. -@end multitable - - - - -@node Regexp, GPL license, Environment variables, Top -@appendix MySQL Regular Expressions - -@cindex regex -@cindex regular expression syntax, described -@cindex syntax, regular expression - -A regular expression (regex) is a powerful way of specifying a complex search. - -MySQL uses Henry Spencer's implementation of regular -expressions, which is aimed at conformance with POSIX -1003.2. MySQL uses the extended version. - -This is a simplistic reference that skips the details. To get more exact -information, see Henry Spencer's @code{regex(7)} manual page that is -included in the source distribution. @xref{Credits}. - -A regular expression describes a set of strings. The simplest regexp is -one that has no special characters in it. For example, the regexp -@code{hello} matches @code{hello} and nothing else. - -Non-trivial regular expressions use certain special constructs so that -they can match more than one string. For example, the regexp -@code{hello|word} matches either the string @code{hello} or the string -@code{word}. - -As a more complex example, the regexp @code{B[an]*s} matches any of the -strings @code{Bananas}, @code{Baaaaas}, @code{Bs}, and any other string -starting with a @code{B}, ending with an @code{s}, and containing any -number of @code{a} or @code{n} characters in between. - -A regular expression may use any of the following special -characters/constructs: -@table @code -@item ^ -Match the beginning of a string. -@example -mysql> SELECT "fo\nfo" REGEXP "^fo$"; -> 0 -mysql> SELECT "fofo" REGEXP "^fo"; -> 1 -@end example -@item $ -Match the end of a string. -@example -mysql> SELECT "fo\no" REGEXP "^fo\no$"; -> 1 -mysql> SELECT "fo\no" REGEXP "^fo$"; -> 0 -@end example -@item . -Match any character (including newline). -@example -mysql> SELECT "fofo" REGEXP "^f.*"; -> 1 -mysql> SELECT "fo\nfo" REGEXP "^f.*"; -> 1 -@end example -@item a* -Match any sequence of zero or more @code{a} characters. -@example -mysql> SELECT "Ban" REGEXP "^Ba*n"; -> 1 -mysql> SELECT "Baaan" REGEXP "^Ba*n"; -> 1 -mysql> SELECT "Bn" REGEXP "^Ba*n"; -> 1 -@end example -@item a+ -Match any sequence of one or more @code{a} characters. -@example -mysql> SELECT "Ban" REGEXP "^Ba+n"; -> 1 -mysql> SELECT "Bn" REGEXP "^Ba+n"; -> 0 -@end example -@item a? -Match either zero or one @code{a} character. -@example -mysql> SELECT "Bn" REGEXP "^Ba?n"; -> 1 -mysql> SELECT "Ban" REGEXP "^Ba?n"; -> 1 -mysql> SELECT "Baan" REGEXP "^Ba?n"; -> 0 -@end example -@item de|abc -Match either of the sequences @code{de} or @code{abc}. -@example -mysql> SELECT "pi" REGEXP "pi|apa"; -> 1 -mysql> SELECT "axe" REGEXP "pi|apa"; -> 0 -mysql> SELECT "apa" REGEXP "pi|apa"; -> 1 -mysql> SELECT "apa" REGEXP "^(pi|apa)$"; -> 1 -mysql> SELECT "pi" REGEXP "^(pi|apa)$"; -> 1 -mysql> SELECT "pix" REGEXP "^(pi|apa)$"; -> 0 -@end example -@item (abc)* -Match zero or more instances of the sequence @code{abc}. -@example -mysql> SELECT "pi" REGEXP "^(pi)*$"; -> 1 -mysql> SELECT "pip" REGEXP "^(pi)*$"; -> 0 -mysql> SELECT "pipi" REGEXP "^(pi)*$"; -> 1 -@end example -@item @{1@} -@itemx @{2,3@} -The is a more general way of writing regexps that match many -occurrences of the previous atom. -@table @code -@item a* -Can be written as @code{a@{0,@}}. -@item a+ -Can be written as @code{a@{1,@}}. -@item a? -Can be written as @code{a@{0,1@}}. -@end table -To be more precise, an atom followed by a bound containing one integer -@code{i} and no comma matches a sequence of exactly @code{i} matches of -the atom. An atom followed by a bound containing one integer @code{i} -and a comma matches a sequence of @code{i} or more matches of the atom. -An atom followed by a bound containing two integers @code{i} and -@code{j} matches a sequence of @code{i} through @code{j} (inclusive) -matches of the atom. - -Both arguments must be in the range from @code{0} to @code{RE_DUP_MAX} -(default 255), inclusive. If there are two arguments, the second must be -greater than or equal to the first. -@item [a-dX] -@itemx [^a-dX] -Matches -any character which is (or is not, if ^ is used) either @code{a}, @code{b}, -@code{c}, @code{d} or @code{X}. To include a literal @code{]} character, -it must immediately follow the opening bracket @code{[}. To include a -literal @code{-} character, it must be written first or last. So -@code{[0-9]} matches any decimal digit. Any character that does not have -a defined meaning inside a @code{[]} pair has no special meaning and -matches only itself. -@example -mysql> SELECT "aXbc" REGEXP "[a-dXYZ]"; -> 1 -mysql> SELECT "aXbc" REGEXP "^[a-dXYZ]$"; -> 0 -mysql> SELECT "aXbc" REGEXP "^[a-dXYZ]+$"; -> 1 -mysql> SELECT "aXbc" REGEXP "^[^a-dXYZ]+$"; -> 0 -mysql> SELECT "gheis" REGEXP "^[^a-dXYZ]+$"; -> 1 -mysql> SELECT "gheisa" REGEXP "^[^a-dXYZ]+$"; -> 0 -@end example -@item [[.characters.]] -The sequence of characters of that collating element. The sequence is a -single element of the bracket expression's list. A bracket expression -containing a multi-character collating element can thus match more than -one character, for example, if the collating sequence includes a @code{ch} -collating element, then the regular expression @code{[[.ch.]]*c} matches the -first five characters of @code{chchcc}. - -@item [=character_class=] -An equivalence class, standing for the sequences of characters of all -collating elements equivalent to that one, including itself. - -For example, if @code{o} and @code{(+)} are the members of an -equivalence class, then @code{[[=o=]]}, @code{[[=(+)=]]}, and -@code{[o(+)]} are all synonymous. An equivalence class may not be an -endpoint of a range. - -@item [:character_class:] -Within a bracket expression, the name of a character class enclosed in -@code{[:} and @code{:]} stands for the list of all characters belonging -to that class. Standard character class names are: - -@multitable @columnfractions .10 .10 .10 -@item @strong{Name} @tab @strong{Name} @tab @strong{Name} -@item alnum @tab digit @tab punct -@item alpha @tab graph @tab space -@item blank @tab lower @tab upper -@item cntrl @tab print @tab xdigit -@end multitable - -These stand for the character classes defined in the @code{ctype(3)} manual -page. A locale may provide others. A character class may not be used as an -endpoint of a range. -@example -mysql> SELECT "justalnums" REGEXP "[[:alnum:]]+"; -> 1 -mysql> SELECT "!!" REGEXP "[[:alnum:]]+"; -> 0 -@end example - -@item [[:<:]] -@itemx [[:>:]] -These match the null string at the beginning and end of a word -respectively. A word is defined as a sequence of word characters which -is neither preceded nor followed by word characters. A word character is -an alnum character (as defined by @code{ctype(3)}) or an underscore -(@code{_}). -@example -mysql> SELECT "a word a" REGEXP "[[:<:]]word[[:>:]]"; -> 1 -mysql> SELECT "a xword a" REGEXP "[[:<:]]word[[:>:]]"; -> 0 -@end example -@end table - -@example -mysql> SELECT "weeknights" REGEXP "^(wee|week)(knights|nights)$"; -> 1 -@end example - - - - -@node GPL license, LGPL license, Regexp, Top -@appendix GNU General Public License - -@cindex GPL, General Public License -@cindex GPL, GNU General Public License - -@center Version 2, June 1991 - -@display -Copyright @copyright{} 1989, 1991 Free Software Foundation, Inc. -59 Temple Place - Suite 330, Boston, MA 02111-1307, USA - -Everyone is permitted to copy and distribute verbatim copies -of this license document, but changing it is not allowed. -@end display - -@appendixsec Preamble - - The licenses for most software are designed to take away your -freedom to share and change it. By contrast, the GNU General Public -License is intended to guarantee your freedom to share and change free -software---to make sure the software is free for all its users. This -General Public License applies to most of the Free Software -Foundation's software and to any other program whose authors commit to -using it. (Some other Free Software Foundation software is covered by -the GNU Library General Public License instead.) You can apply it to -your programs, too. - - When we speak of free software, we are referring to freedom, not -price. Our General Public Licenses are designed to make sure that you -have the freedom to distribute copies of free software (and charge for -this service if you wish), that you receive source code or can get it -if you want it, that you can change the software or use pieces of it -in new free programs; and that you know you can do these things. - - To protect your rights, we need to make restrictions that forbid -anyone to deny you these rights or to ask you to surrender the rights. -These restrictions translate to certain responsibilities for you if you -distribute copies of the software, or if you modify it. - - For example, if you distribute copies of such a program, whether -gratis or for a fee, you must give the recipients all the rights that -you have. You must make sure that they, too, receive or can get the -source code. And you must show them these terms so they know their -rights. - - We protect your rights with two steps: (1) copyright the software, and -(2) offer you this license which gives you legal permission to copy, -distribute and/or modify the software. - - Also, for each author's protection and ours, we want to make certain -that everyone understands that there is no warranty for this free -software. If the software is modified by someone else and passed on, we -want its recipients to know that what they have is not the original, so -that any problems introduced by others will not reflect on the original -authors' reputations. - - Finally, any free program is threatened constantly by software -patents. We wish to avoid the danger that redistributors of a free -program will individually obtain patent licenses, in effect making the -program proprietary. To prevent this, we have made it clear that any -patent must be licensed for everyone's free use or not licensed at all. - - The precise terms and conditions for copying, distribution and -modification follow. - -@iftex -@appendixsec TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION -@end iftex -@ifinfo -@center GNU GENERAL PUBLIC LICENSE -@center TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION +You can find a specific manual for any older version of MySQL +in the binary or source distribution for that version. @end ifinfo -@enumerate 0 -@item -This License applies to any program or other work which contains -a notice placed by the copyright holder saying it may be distributed -under the terms of this General Public License. The ``Program'', below, -refers to any such program or work, and a ``work based on the Program'' -means either the Program or any derivative work under copyright law: -that is to say, a work containing the Program or a portion of it, -either verbatim or with modifications and/or translated into another -language. (Hereinafter, translation is included without limitation in -the term ``modification''.) Each licensee is addressed as ``you''. - -Activities other than copying, distribution and modification are not -covered by this License; they are outside its scope. The act of -running the Program is not restricted, and the output from the Program -is covered only if its contents constitute a work based on the -Program (independent of having been made by running the Program). -Whether that is true depends on what the Program does. - -@item -You may copy and distribute verbatim copies of the Program's -source code as you receive it, in any medium, provided that you -conspicuously and appropriately publish on each copy an appropriate -copyright notice and disclaimer of warranty; keep intact all the -notices that refer to this License and to the absence of any warranty; -and give any other recipients of the Program a copy of this License -along with the Program. - -You may charge a fee for the physical act of transferring a copy, and -you may at your option offer warranty protection in exchange for a fee. - -@item -You may modify your copy or copies of the Program or any portion -of it, thus forming a work based on the Program, and copy and -distribute such modifications or work under the terms of Section 1 -above, provided that you also meet all of these conditions: - -@enumerate a -@item -You must cause the modified files to carry prominent notices -stating that you changed the files and the date of any change. - -@item -You must cause any work that you distribute or publish, that in -whole or in part contains or is derived from the Program or any -part thereof, to be licensed as a whole at no charge to all third -parties under the terms of this License. - -@item -If the modified program normally reads commands interactively -when run, you must cause it, when started running for such -interactive use in the most ordinary way, to print or display an -announcement including an appropriate copyright notice and a -notice that there is no warranty (or else, saying that you provide -a warranty) and that users may redistribute the program under -these conditions, and telling the user how to view a copy of this -License. (Exception: if the Program itself is interactive but -does not normally print such an announcement, your work based on -the Program is not required to print an announcement.) -@end enumerate - -These requirements apply to the modified work as a whole. If -identifiable sections of that work are not derived from the Program, -and can be reasonably considered independent and separate works in -themselves, then this License, and its terms, do not apply to those -sections when you distribute them as separate works. But when you -distribute the same sections as part of a whole which is a work based -on the Program, the distribution of the whole must be on the terms of -this License, whose permissions for other licensees extend to the -entire whole, and thus to each and every part regardless of who wrote it. - -Thus, it is not the intent of this section to claim rights or contest -your rights to work written entirely by you; rather, the intent is to -exercise the right to control the distribution of derivative or -collective works based on the Program. - -In addition, mere aggregation of another work not based on the Program -with the Program (or with a work based on the Program) on a volume of -a storage or distribution medium does not bring the other work under -the scope of this License. - -@item -You may copy and distribute the Program (or a work based on it, -under Section 2) in object code or executable form under the terms of -Sections 1 and 2 above provided that you also do one of the following: - -@enumerate a -@item -Accompany it with the complete corresponding machine-readable -source code, which must be distributed under the terms of Sections -1 and 2 above on a medium customarily used for software interchange; or, - -@item -Accompany it with a written offer, valid for at least three -years, to give any third-party, for a charge no more than your -cost of physically performing source distribution, a complete -machine-readable copy of the corresponding source code, to be -distributed under the terms of Sections 1 and 2 above on a medium -customarily used for software interchange; or, - -@item -Accompany it with the information you received as to the offer -to distribute corresponding source code. (This alternative is -allowed only for noncommercial distribution and only if you -received the program in object code or executable form with such -an offer, in accord with Subsection b above.) -@end enumerate - -The source code for a work means the preferred form of the work for -making modifications to it. For an executable work, complete source -code means all the source code for all modules it contains, plus any -associated interface definition files, plus the scripts used to -control compilation and installation of the executable. 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Any attempt -otherwise to copy, modify, sublicense or distribute the Program is -void, and will automatically terminate your rights under this License. -However, parties who have received copies, or rights, from you under -this License will not have their licenses terminated so long as such -parties remain in full compliance. - -@item -You are not required to accept this License, since you have not -signed it. However, nothing else grants you permission to modify or -distribute the Program or its derivative works. These actions are -prohibited by law if you do not accept this License. Therefore, by -modifying or distributing the Program (or any work based on the -Program), you indicate your acceptance of this License to do so, and -all its terms and conditions for copying, distributing or modifying -the Program or works based on it. - -@item -Each time you redistribute the Program (or any work based on the -Program), the recipient automatically receives a license from the -original licensor to copy, distribute or modify the Program subject to -these terms and conditions. You may not impose any further -restrictions on the recipients' exercise of the rights granted herein. -You are not responsible for enforcing compliance by third parties to -this License. - -@item -If, as a consequence of a court judgment or allegation of patent -infringement or for any other reason (not limited to patent issues), -conditions are imposed on you (whether by court order, agreement or -otherwise) that contradict the conditions of this License, they do not -excuse you from the conditions of this License. If you cannot -distribute so as to satisfy simultaneously your obligations under this -License and any other pertinent obligations, then as a consequence you -may not distribute the Program at all. For example, if a patent -license would not permit royalty-free redistribution of the Program by -all those who receive copies directly or indirectly through you, then -the only way you could satisfy both it and this License would be to -refrain entirely from distribution of the Program. - -If any portion of this section is held invalid or unenforceable under -any particular circumstance, the balance of the section is intended to -apply and the section as a whole is intended to apply in other -circumstances. - -It is not the purpose of this section to induce you to infringe any -patents or other property right claims or to contest validity of any -such claims; this section has the sole purpose of protecting the -integrity of the free software distribution system, which is -implemented by public license practices. Many people have made -generous contributions to the wide range of software distributed -through that system in reliance on consistent application of that -system; it is up to the author/donor to decide if he or she is willing -to distribute software through any other system and a licensee cannot -impose that choice. - -This section is intended to make thoroughly clear what is believed to -be a consequence of the rest of this License. - -@item -If the distribution and/or use of the Program is restricted in -certain countries either by patents or by copyrighted interfaces, the -original copyright holder who places the Program under this License -may add an explicit geographical distribution limitation excluding -those countries, so that distribution is permitted only in or among -countries not thus excluded. In such case, this License incorporates -the limitation as if written in the body of this License. - -@item -The Free Software Foundation may publish revised and/or new versions -of the General Public License from time to time. Such new versions will -be similar in spirit to the present version, but may differ in detail to -address new problems or concerns. - -Each version is given a distinguishing version number. If the Program -specifies a version number of this License which applies to it and ``any -later version'', you have the option of following the terms and conditions -either of that version or of any later version published by the Free -Software Foundation. If the Program does not specify a version number of -this License, you may choose any version ever published by the Free Software -Foundation. - -@item -If you wish to incorporate parts of the Program into other free -programs whose distribution conditions are different, write to the author -to ask for permission. For software which is copyrighted by the Free -Software Foundation, write to the Free Software Foundation; we sometimes -make exceptions for this. Our decision will be guided by the two goals -of preserving the free status of all derivatives of our free software and -of promoting the sharing and reuse of software generally. - -@iftex -@heading NO WARRANTY -@end iftex -@ifinfo -@center NO WARRANTY -@end ifinfo - -@item -BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY -FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN -OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES -PROVIDE THE PROGRAM ``AS IS'' WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED -OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF -MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS -TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE -PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, -REPAIR OR CORRECTION. - -@item -IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING -WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR -REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, -INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING -OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED -TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY -YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER -PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE -POSSIBILITY OF SUCH DAMAGES. -@end enumerate - -@iftex -@heading END OF TERMS AND CONDITIONS -@end iftex -@ifinfo -@center END OF TERMS AND CONDITIONS -@end ifinfo - -@page -@appendixsec How to Apply These Terms to Your New Programs - - If you develop a new program, and you want it to be of the greatest -possible use to the public, the best way to achieve this is to make it -free software which everyone can redistribute and change under these terms. - - To do so, attach the following notices to the program. It is safest -to attach them to the start of each source file to most effectively -convey the exclusion of warranty; and each file should have at least -the ``copyright'' line and a pointer to where the full notice is found. - -@smallexample -@var{one line to give the program's name and a brief idea of what it does.} -Copyright (C) @var{yyyy} @var{name of author} - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. -@end smallexample - -Also add information on how to contact you by electronic and paper mail. - -If the program is interactive, make it output a short notice like this -when it starts in an interactive mode: - -@smallexample -Gnomovision version 69, Copyright (C) 19@var{yy} @var{name of author} -Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. -This is free software, and you are welcome to redistribute it -under certain conditions; type `show c' for details. -@end smallexample - -The hypothetical commands @samp{show w} and @samp{show c} should show -the appropriate parts of the General Public License. Of course, the -commands you use may be called something other than @samp{show w} and -@samp{show c}; they could even be mouse-clicks or menu items---whatever -suits your program. - -You should also get your employer (if you work as a programmer) or your -school, if any, to sign a ``copyright disclaimer'' for the program, if -necessary. Here is a sample; alter the names: - -@example -Yoyodyne, Inc., hereby disclaims all copyright interest in the program -`Gnomovision' (which makes passes at compilers) written by James Hacker. - -@var{signature of Ty Coon}, 1 April 1989 -Ty Coon, President of Vice -@end example - -This General Public License does not permit incorporating your program into -proprietary programs. If your program is a subroutine library, you may -consider it more useful to permit linking proprietary applications with the -library. If this is what you want to do, use the GNU Library General -Public License instead of this License. - -@page - - - - -@node LGPL license, Function Index, GPL license, Top -@appendix GNU Lesser General Public License - -@cindex LGPL, Library General Public License -@cindex LGPL, GNU Library General Public License -@cindex LGPL, Lesser General Public License -@cindex LGPL, GNU Lesser General Public License - -@center Version 2.1, February 1999 - -@display -Copyright @copyright{} 1991, 1999 Free Software Foundation, Inc. -59 Temple Place -- Suite 330, Boston, MA 02111-1307, USA - -Everyone is permitted to copy and distribute verbatim copies -of this license document, but changing it is not allowed. - -[This is the first released version of the Lesser GPL. It also counts -as the successor of the GNU Library Public License, version 2, hence the -version number 2.1.] -@end display - -@appendixsec Preamble - - The licenses for most software are designed to take away your -freedom to share and change it. By contrast, the GNU General Public -Licenses are intended to guarantee your freedom to share and change -free software---to make sure the software is free for all its users. - - This license, the Lesser General Public License, applies to some -specially designated software---typically libraries---of the Free -Software Foundation and other authors who decide to use it. You can use -it too, but we suggest you first think carefully about whether this -license or the ordinary General Public License is the better strategy to -use in any particular case, based on the explanations below. - - When we speak of free software, we are referring to freedom of use, -not price. Our General Public Licenses are designed to make sure that -you have the freedom to distribute copies of free software (and charge -for this service if you wish); that you receive source code or can get -it if you want it; that you can change the software and use pieces of it -in new free programs; and that you are informed that you can do these -things. - - To protect your rights, we need to make restrictions that forbid -distributors to deny you these rights or to ask you to surrender these -rights. These restrictions translate to certain responsibilities for -you if you distribute copies of the library or if you modify it. - - For example, if you distribute copies of the library, whether gratis -or for a fee, you must give the recipients all the rights that we gave -you. You must make sure that they, too, receive or can get the source -code. If you link other code with the library, you must provide -complete object files to the recipients, so that they can relink them -with the library after making changes to the library and recompiling -it. And you must show them these terms so they know their rights. - - We protect your rights with a two-step method: (1) we copyright the -library, and (2) we offer you this license, which gives you legal -permission to copy, distribute and/or modify the library. - - To protect each distributor, we want to make it very clear that -there is no warranty for the free library. Also, if the library is -modified by someone else and passed on, the recipients should know -that what they have is not the original version, so that the original -author's reputation will not be affected by problems that might be -introduced by others. - - Finally, software patents pose a constant threat to the existence of -any free program. We wish to make sure that a company cannot -effectively restrict the users of a free program by obtaining a -restrictive license from a patent holder. Therefore, we insist that -any patent license obtained for a version of the library must be -consistent with the full freedom of use specified in this license. - - Most GNU software, including some libraries, is covered by the -ordinary GNU General Public License. This license, the GNU Lesser -General Public License, applies to certain designated libraries, and -is quite different from the ordinary General Public License. We use -this license for certain libraries in order to permit linking those -libraries into non-free programs. - - When a program is linked with a library, whether statically or using -a shared library, the combination of the two is legally speaking a -combined work, a derivative of the original library. 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Pay close attention to the difference between a -``work based on the library'' and a ``work that uses the library''. The -former contains code derived from the library, whereas the latter must -be combined with the library in order to run. - -@iftex -@appendixsec TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION -@end iftex -@ifinfo -@center GNU LESSER GENERAL PUBLIC LICENSE -@center TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION -@end ifinfo - -@enumerate 0 -@item -This License Agreement applies to any software library or other program -which contains a notice placed by the copyright holder or other -authorized party saying it may be distributed under the terms of this -Lesser General Public License (also called ``this License''). 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See the GNU -Lesser General Public License for more details. - -You should have received a copy of the GNU Lesser General Public -License along with this library; if not, write to the Free Software -Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, -USA. -@end smallexample - -Also add information on how to contact you by electronic and paper mail. - -You should also get your employer (if you work as a programmer) or your -school, if any, to sign a ``copyright disclaimer'' for the library, if -necessary. Here is a sample; alter the names: - -@smallexample -Yoyodyne, Inc., hereby disclaims all copyright interest in the library -`Frob' (a library for tweaking knobs) written by James Random Hacker. - -@var{signature of Ty Coon}, 1 April 1990 -Ty Coon, President of Vice -@end smallexample - -That's all there is to it! - - - - -@node Function Index, Concept Index, LGPL license, Top -@unnumbered SQL command, type and function index - -@printindex fn - -@page - - -@node Concept Index, , Function Index, Top -@unnumbered Concept Index - -@printindex cp - - - - - @bye diff --git a/Docs/reservedwords.texi b/Docs/reservedwords.texi new file mode 100644 index 00000000000..a6dddfe9a7a --- /dev/null +++ b/Docs/reservedwords.texi @@ -0,0 +1,14 @@ +@c This is a placeholder file for the autogenerated MySQL reserved +@c word list "reservedwords.texi", which is being included in +@c manual.texi when building the manual. +@c +@c This file will be replaced with the actual reserved word list +@c from the "mysqldoc" BK source tree when building the official +@c source distribution. +@c +@c Please note, that the manual is now maintained in a separate +@c "mysqldoc" BitKeeper tree! See +@c +@c http://www.mysql.com/doc/en/Installing_source_tree.html +@c +@c for more info on how to work with the MySQL BK source trees. diff --git a/Makefile.am b/Makefile.am index d97b28bf07d..ea965e282f3 100644 --- a/Makefile.am +++ b/Makefile.am @@ -25,8 +25,9 @@ SUBDIRS = . include @docs_dirs@ \ @readline_topdir@ @readline_dir@ \ @thread_dirs@ pstack @sql_client_dirs@ \ @sql_server_dirs@ scripts man tests \ - BUILD os2 libmysql_r @libmysqld_dirs@ \ - @bench_dirs@ support-files @fs_dirs@ @tools_dirs@ + BUILD netware os2 @libmysqld_dirs@ \ + @bench_dirs@ support-files @fs_dirs@ @tools_dirs@ \ + @platform_dir@ # Relink after clean linked_sources = linked_client_sources linked_server_sources \ diff --git a/bdb/os/os_handle.c b/bdb/os/os_handle.c index 19a337f7d22..5f617085e5d 100644 --- a/bdb/os/os_handle.c +++ b/bdb/os/os_handle.c @@ -132,7 +132,7 @@ __os_openhandle(dbenv, name, flags, mode, fhp) } else { #if defined(HAVE_FCNTL_F_SETFD) /* Deny file descriptor access to any child process. */ - if (fcntl(fhp->fd, F_SETFD, 1) == -1) { + if (fcntl(fhp->fd, F_SETFD, FD_CLOEXEC) == -1) { ret = __os_get_errno(); __db_err(dbenv, "fcntl(F_SETFD): %s", strerror(ret)); diff --git a/client/mysql.cc b/client/mysql.cc index cef31b46b2c..574dc7c45cc 100644 --- a/client/mysql.cc +++ b/client/mysql.cc @@ -40,7 +40,7 @@ #include <signal.h> #include <violite.h> -const char *VER= "13.3"; +const char *VER= "13.4"; /* Don't try to make a nice table if the data is too big */ #define MAX_COLUMN_LENGTH 1024 @@ -79,7 +79,7 @@ extern "C" { #undef bcmp // Fix problem with new readline #if defined( __WIN__) || defined(OS2) #include <conio.h> -#else +#elif !defined(__NETWARE__) #include <readline/readline.h> #define HAVE_READLINE #endif @@ -97,6 +97,10 @@ extern "C" { #define cmp_database(A,B) strcmp((A),(B)) #endif +#if !defined( __WIN__) && !defined( OS2) && !defined(__NETWARE__) && (!defined(HAVE_mit_thread) || !defined(THREAD)) +#define USE_POPEN +#endif + #include "completion_hash.h" #define PROMPT_CHAR '\\' @@ -176,12 +180,12 @@ static int com_quit(String *str,char*), com_connect(String *str,char*), com_status(String *str,char*), com_use(String *str,char*), com_source(String *str, char*), com_rehash(String *str, char*), com_tee(String *str, char*), - com_notee(String *str, char*), com_shell(String *str, char *), + com_notee(String *str, char*), com_prompt(String *str, char*); -#ifndef __WIN__ +#ifdef USE_POPEN static int com_nopager(String *str, char*), com_pager(String *str, char*), - com_edit(String *str,char*); + com_edit(String *str,char*), com_shell(String *str, char *); #endif static int read_lines(bool execute_commands); @@ -192,7 +196,7 @@ static void safe_put_field(const char *pos,ulong length); static void xmlencode_print(const char *src, uint length); static void init_pager(); static void end_pager(); -static int init_tee(char *); +static void init_tee(const char *); static void end_tee(); static const char* construct_prompt(); static char *get_arg(char *line, my_bool get_next_arg); @@ -216,18 +220,18 @@ static COMMANDS commands[] = { { "clear", 'c', com_clear, 0, "Clear command."}, { "connect",'r', com_connect,1, "Reconnect to the server. Optional arguments are db and host." }, -#ifndef __WIN__ +#ifdef USE_POPEN { "edit", 'e', com_edit, 0, "Edit command with $EDITOR."}, #endif { "ego", 'G', com_ego, 0, "Send command to mysql server, display result vertically."}, { "exit", 'q', com_quit, 0, "Exit mysql. Same as quit."}, { "go", 'g', com_go, 0, "Send command to mysql server." }, -#ifndef __WIN__ +#ifdef USE_POPEN { "nopager",'n', com_nopager,0, "Disable pager, print to stdout." }, #endif { "notee", 't', com_notee, 0, "Don't write into outfile." }, -#ifndef __WIN__ +#ifdef USE_POPEN { "pager", 'P', com_pager, 1, "Set PAGER [to_pager]. Print the query results via PAGER." }, #endif @@ -238,7 +242,7 @@ static COMMANDS commands[] = { { "source", '.', com_source, 1, "Execute a SQL script file. Takes a file name as an argument."}, { "status", 's', com_status, 0, "Get status information from the server."}, -#ifndef __WIN__ +#ifdef USE_POPEN { "system", '!', com_shell, 1, "Execute a system shell command."}, #endif { "tee", 'T', com_tee, 1, @@ -309,8 +313,8 @@ int main(int argc,char *argv[]) current_prompt = my_strdup(default_prompt,MYF(MY_WME)); prompt_counter=0; - strmov(outfile, "\0"); // no (default) outfile, unless given at least once - strmov(pager, "stdout"); // the default, if --pager wasn't given + outfile[0]=0; // no (default) outfile + strmov(pager, "stdout"); // the default, if --pager wasn't given { char *tmp=getenv("PAGER"); if (tmp) @@ -505,7 +509,7 @@ static struct my_option my_long_options[] = NO_ARG, 1, 0, 0, 0, 0, 0}, {"skip-line-numbers", 'L', "Don't write line number for errors. WARNING: -L is deprecated, use long version of this option instead.", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, -#ifndef __WIN__ +#ifdef USE_POPEN {"no-pager", OPT_NOPAGER, "Disable pager and print to stdout. See interactive help (\\h) also. WARNING: option deprecated; use --disable-pager instead.", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, @@ -526,7 +530,7 @@ static struct my_option my_long_options[] = {"one-database", 'o', "Only update the default database. This is useful for skipping updates to other database in the update log.", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, -#ifndef __WIN__ +#ifdef USE_POPEN {"pager", OPT_PAGER, "Pager to use to display results. If you don't supply an option the default pager is taken from your ENV variable PAGER. Valid pagers are less, more, cat [> filename], etc. See interactive help (\\h) also. This option does not work in batch mode.", 0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0}, @@ -640,7 +644,7 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)), end_tee(); } else - opt_outfile= init_tee(argument); + init_tee(argument); break; case OPT_NOTEE: printf("WARNING: option deprecated; use --disable-tee instead.\n"); @@ -803,7 +807,7 @@ static int get_options(int argc, char **argv) static int read_lines(bool execute_commands) { -#if defined( __WIN__) || defined(OS2) +#if defined( __WIN__) || defined(OS2) || defined(__NETWARE__) char linebuffer[254]; #endif char *line; @@ -824,30 +828,33 @@ static int read_lines(bool execute_commands) } else { -#if defined( __WIN__) || defined(OS2) + char *prompt= (char*) (glob_buffer.is_empty() ? construct_prompt() : + !in_string ? " -> " : + in_string == '\'' ? + " '> " : " \"> "); if (opt_outfile && glob_buffer.is_empty()) fflush(OUTFILE); - tee_fputs(glob_buffer.is_empty() ? construct_prompt() : - !in_string ? " -> " : - in_string == '\'' ? - " '> " : " \"> ",stdout); - linebuffer[0]=(char) sizeof(linebuffer); - line=_cgets(linebuffer); -#else - if (opt_outfile) + +#if defined( __WIN__) || defined(OS2) || defined(__NETWARE__) + tee_fputs(prompt, stdout); +#ifdef __NETWARE__ + line=fgets(linebuffer, sizeof(linebuffer)-1, stdin); + /* Remove the '\n' */ { - if (glob_buffer.is_empty()) - fflush(OUTFILE); - fputs(glob_buffer.is_empty() ? construct_prompt() : - !in_string ? " -> " : - in_string == '\'' ? - " '> " : " \"> ", OUTFILE); + char *p = strrchr(line, '\n'); + if (p != NULL) + *p = '\0'; } - line=readline((char*) (glob_buffer.is_empty() ? construct_prompt() : - !in_string ? " -> " : - in_string == '\'' ? - " '> " : " \"> ")); -#endif +#else + linebuffer[0]= (char) sizeof(linebuffer); + line= _cgets(linebuffer); +#endif /* __NETWARE__ */ +#else + if (opt_outfile) + fputs(prompt, OUTFILE); + line= readline(prompt); +#endif /* defined( __WIN__) || defined(OS2) || defined(__NETWARE__) */ + if (opt_outfile) fprintf(OUTFILE, "%s\n", line); } @@ -1682,7 +1689,7 @@ com_go(String *buffer,char *line __attribute__((unused))) static void init_pager() { -#if !defined( __WIN__) && !defined( OS2) && (!defined(HAVE_mit_thread) || !defined(THREAD)) +#ifdef USE_POPEN if (!opt_nopager) { if (!(PAGER= popen(pager, "w"))) @@ -1698,30 +1705,35 @@ static void init_pager() static void end_pager() { -#if !defined( __WIN__) && !defined( OS2) && !(defined(HAVE_mit_thread) && defined(THREAD)) +#ifdef USE_POPEN if (!opt_nopager) pclose(PAGER); #endif } -static int init_tee(char* newfile) +static void init_tee(const char *file_name) { FILE* new_outfile; - if (!(new_outfile= my_fopen(newfile, O_APPEND | O_WRONLY, MYF(MY_WME)))) - return 0; if (opt_outfile) end_tee(); + if (!(new_outfile= my_fopen(file_name, O_APPEND | O_WRONLY, MYF(MY_WME)))) + { + tee_fprintf(stdout, "Error logging to file '%s'\n", file_name); + return; + } OUTFILE = new_outfile; - strmake(outfile,newfile,FN_REFLEN-1); - tee_fprintf(stdout, "Logging to file '%s'\n", outfile); - return 1; + strmake(outfile, file_name, FN_REFLEN-1); + tee_fprintf(stdout, "Logging to file '%s'\n", file_name); + opt_outfile= 1; + return; } static void end_tee() { my_fclose(OUTFILE, MYF(0)); + OUTFILE= 0; opt_outfile= 0; return; } @@ -1761,6 +1773,9 @@ print_table_data(MYSQL_RES *result) MYSQL_ROW cur; MYSQL_FIELD *field; bool *num_flag; +#ifdef __NETWARE__ + uint lines= 0; +#endif num_flag=(bool*) my_alloca(sizeof(bool)*mysql_num_fields(result)); if (info_flag) @@ -1816,16 +1831,24 @@ print_table_data(MYSQL_RES *result) length, str); } (void) tee_fputs("\n", PAGER); +#ifdef __NETWARE__ + // on a long result the screen could hog the cpu + if ((lines++ & 1023) == 0) pthread_yield(); +#endif } tee_puts(separator.c_ptr(), PAGER); my_afree((gptr) num_flag); } + static void print_table_data_html(MYSQL_RES *result) { - MYSQL_ROW cur; - MYSQL_FIELD *field; + MYSQL_ROW cur; + MYSQL_FIELD *field; +#ifdef __NETWARE__ + uint lines= 0; +#endif mysql_field_seek(result,0); (void) tee_fputs("<TABLE BORDER=1><TR>", PAGER); @@ -1850,6 +1873,10 @@ print_table_data_html(MYSQL_RES *result) (void) tee_fputs("</TD>", PAGER); } (void) tee_fputs("</TR>", PAGER); +#ifdef __NETWARE__ + // on a long result the screen could hog the cpu + if ((lines++ & 1023) == 0) pthread_yield(); +#endif } (void) tee_fputs("</TABLE>", PAGER); } @@ -1883,6 +1910,10 @@ print_table_data_xml(MYSQL_RES *result) " ") : "NULL")); } (void) tee_fputs(" </row>\n", PAGER); +#ifdef __NETWARE__ + // on a long result the screen could hog the cpu + if ((lines++ & 1023) == 0) pthread_yield(); +#endif } (void) tee_fputs("</resultset>\n", PAGER); } @@ -1915,6 +1946,10 @@ print_table_data_vertically(MYSQL_RES *result) tee_fprintf(PAGER, "%*s: ",(int) max_length,field->name); tee_fprintf(PAGER, "%s\n",cur[off] ? (char*) cur[off] : "NULL"); } +#ifdef __NETWARE__ + // on a long result the screen could hog the cpu + if ((row_count & 1023) == 0) pthread_yield(); +#endif } } @@ -2056,11 +2091,7 @@ com_tee(String *buffer, char *line __attribute__((unused))) printf("No outfile specified!\n"); return 0; } - opt_outfile= init_tee(file_name); - if (opt_outfile) - tee_fprintf(stdout, "Logging to file '%s'\n", outfile); - else - tee_fprintf(stdout, "Error logging to file '%s'\n",file_name); + init_tee(file_name); return 0; } @@ -2079,7 +2110,7 @@ com_notee(String *buffer __attribute__((unused)), Sorry, this command is not available in Windows. */ -#ifndef __WIN__ +#ifdef USE_POPEN static int com_pager(String *buffer, char *line __attribute__((unused))) { @@ -2090,9 +2121,9 @@ com_pager(String *buffer, char *line __attribute__((unused))) /* Skip space from file name */ while (my_isspace(system_charset_info,*line)) line++; - if (!(param = strchr(line, ' '))) // if pager was not given, use the default + if (!(param= strchr(line, ' '))) // if pager was not given, use the default { - if (!strlen(default_pager)) + if (!default_pager[0]) { tee_fprintf(stdout, "Default pager wasn't set, using stdout.\n"); opt_nopager=1; @@ -2136,7 +2167,7 @@ com_nopager(String *buffer __attribute__((unused)), Sorry, you can't send the result to an editor in Win32 */ -#ifndef __WIN__ +#ifdef USE_POPEN static int com_edit(String *buffer,char *line __attribute__((unused))) { @@ -2184,6 +2215,10 @@ static int com_quit(String *buffer __attribute__((unused)), char *line __attribute__((unused))) { +#ifdef __NETWARE__ + // let the screen auto close on a normal shutdown + setscreenmode(SCR_AUTOCLOSE_ON_EXIT); +#endif status.exit_status=0; return 1; } @@ -2199,7 +2234,7 @@ com_rehash(String *buffer __attribute__((unused)), } -#ifndef __WIN__ +#ifdef USE_POPEN static int com_shell(String *buffer, char *line __attribute__((unused))) { @@ -2588,7 +2623,7 @@ com_status(String *buffer __attribute__((unused)), tee_fprintf(stdout, "\nAll updates ignored to this database\n"); vidattr(A_NORMAL); } -#ifndef __WIN__ +#ifdef USE_POPEN tee_fprintf(stdout, "Current pager:\t\t%s\n", pager); tee_fprintf(stdout, "Using outfile:\t\t'%s'\n", opt_outfile ? outfile : ""); #endif @@ -2763,7 +2798,7 @@ void tee_putc(int c, FILE *file) putc(c, OUTFILE); } -#if defined( __WIN__) || defined( OS2) +#if defined( __WIN__) || defined( OS2) || defined(__NETWARE__) #include <time.h> #else #include <sys/times.h> @@ -2775,7 +2810,7 @@ void tee_putc(int c, FILE *file) static ulong start_timer(void) { -#if defined( __WIN__) || defined( OS2) +#if defined( __WIN__) || defined( OS2) || defined(__NETWARE__) return clock(); #else struct tms tms_tmp; @@ -2876,7 +2911,10 @@ static const char* construct_prompt() ! mysql.unix_socket) add_int_to_prompt(mysql.port); else - processed_prompt.append(strrchr(mysql.unix_socket,'/')+1); + { + char *pos=strrchr(mysql.unix_socket,'/'); + processed_prompt.append(pos ? pos+1 : mysql.unix_socket); + } #endif break; case 'U': diff --git a/client/mysqladmin.c b/client/mysqladmin.c index 2fc77552d5f..cba137d54c6 100644 --- a/client/mysqladmin.c +++ b/client/mysqladmin.c @@ -25,8 +25,8 @@ #include <sys/stat.h> #include <mysql.h> -#define ADMIN_VERSION "8.39" -#define MAX_MYSQL_VAR 128 +#define ADMIN_VERSION "8.40" +#define MAX_MYSQL_VAR 256 #define SHUTDOWN_DEF_TIMEOUT 3600 /* Wait for shutdown */ #define MAX_TRUNC_LENGTH 3 @@ -1016,7 +1016,7 @@ static void print_relative_row(MYSQL_RES *result, MYSQL_ROW cur, uint row) printf("| %-*s|", (int) field->max_length + 1, cur[0]); field = mysql_fetch_field(result); - tmp = cur[1] ? strtoull(cur[1], NULL, 0) : (ulonglong) 0; + tmp = cur[1] ? strtoull(cur[1], NULL, 10) : (ulonglong) 0; printf(" %-*s|\n", (int) field->max_length + 1, llstr((tmp - last_values[row]), buff)); last_values[row] = tmp; @@ -1034,7 +1034,7 @@ static void print_relative_row_vert(MYSQL_RES *result __attribute__((unused)), if (!row) putchar('|'); - tmp = cur[1] ? strtoull(cur[1], NULL, 0) : (ulonglong) 0; + tmp = cur[1] ? strtoull(cur[1], NULL, 10) : (ulonglong) 0; printf(" %-*s|", ex_val_max_len[row] + 1, llstr((tmp - last_values[row]), buff)); diff --git a/client/mysqlcheck.c b/client/mysqlcheck.c index f9719f05bf3..cd67a2c7522 100644 --- a/client/mysqlcheck.c +++ b/client/mysqlcheck.c @@ -16,7 +16,7 @@ /* By Jani Tolonen, 2001-04-20, MySQL Development Team */ -#define CHECK_VERSION "2.4.2" +#define CHECK_VERSION "2.4.3" #include "client_priv.h" #include <m_ctype.h> @@ -167,6 +167,7 @@ static void dbDisconnect(char *host); static void DBerror(MYSQL *mysql, const char *when); static void safe_exit(int error); static void print_result(); +static char *fix_table_name(char *dest, char *src); int what_to_do = 0; static void print_version(void) @@ -390,7 +391,8 @@ static int process_selected_tables(char *db, char **table_names, int tables) for (end = table_names_comma_sep + 1; tables > 0; tables--, table_names++) { - end = strxmov(end, " `", *table_names, "`,", NullS); + end= fix_table_name(end, *table_names); + *end++= ','; } *--end = 0; handle_request_for_tables(table_names_comma_sep + 1, tot_length - 1); @@ -403,6 +405,22 @@ static int process_selected_tables(char *db, char **table_names, int tables) } /* process_selected_tables */ +static char *fix_table_name(char *dest, char *src) +{ + char *db_sep; + + *dest++= '`'; + if ((db_sep= strchr(src, '.'))) + { + dest= strmake(dest, src, (uint) (db_sep - src)); + dest= strmov(dest, "`.`"); + src= db_sep + 1; + } + dest= strxmov(dest, src, "`", NullS); + return dest; +} + + static int process_all_tables_in_db(char *database) { MYSQL_RES *res; @@ -437,7 +455,8 @@ static int process_all_tables_in_db(char *database) } for (end = tables + 1; (row = mysql_fetch_row(res)) ;) { - end = strxmov(end, " `", row[0], "`,", NullS); + end= fix_table_name(end, row[0]); + *end++= ','; } *--end = 0; if (tot_length) @@ -468,6 +487,7 @@ static int use_db(char *database) static int handle_request_for_tables(char *tables, uint length) { char *query, *end, options[100], message[100]; + uint query_length= 0; const char *op = 0; options[0] = 0; @@ -498,11 +518,21 @@ static int handle_request_for_tables(char *tables, uint length) if (!(query =(char *) my_malloc((sizeof(char)*(length+110)), MYF(MY_WME)))) return 1; if (opt_all_in_1) + { /* No backticks here as we added them before */ - sprintf(query, "%s TABLE %s %s", op, tables, options); + query_length= my_sprintf(query, + (query, "%s TABLE %s %s", op, tables, options)); + } else - sprintf(query, "%s TABLE `%s` %s", op, tables, options); - if (mysql_query(sock, query)) + { + char *ptr; + + ptr= strmov(strmov(query, op), " TABLE "); + ptr= fix_table_name(ptr, tables); + ptr= strxmov(ptr, " ", options, NullS); + query_length= (uint) (ptr - query); + } + if (mysql_real_query(sock, query, query_length)) { sprintf(message, "when executing '%s TABLE ... %s'", op, options); DBerror(sock, message); diff --git a/client/mysqldump.c b/client/mysqldump.c index 5eabce9b038..0d5b1edc89a 100644 --- a/client/mysqldump.c +++ b/client/mysqldump.c @@ -375,7 +375,7 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)), tty_password=1; break; case 'r': - if (!(md_result_file = my_fopen(argument, O_WRONLY | O_BINARY, + if (!(md_result_file = my_fopen(argument, O_WRONLY | FILE_BINARY, MYF(MY_WME)))) exit(1); break; diff --git a/client/mysqltest.c b/client/mysqltest.c index c938ec5eec0..f417018dbb7 100644 --- a/client/mysqltest.c +++ b/client/mysqltest.c @@ -684,7 +684,7 @@ int open_file(const char* name) if (*cur_file && cur_file == file_stack_end) die("Source directives are nesting too deep"); - if (!(*(cur_file+1) = my_fopen(buff, O_RDONLY | O_BINARY, MYF(MY_WME)))) + if (!(*(cur_file+1) = my_fopen(buff, O_RDONLY | FILE_BINARY, MYF(MY_WME)))) die(NullS); cur_file++; *++lineno=1; @@ -692,18 +692,6 @@ int open_file(const char* name) return 0; } -static void my_sleep(ulong m_seconds) -{ -#ifndef OS2 - struct timeval t; - t.tv_sec= m_seconds / 1000000L; - t.tv_usec= m_seconds % 1000000L; - select(0,0,0,0,&t); /* sleep */ -#else - DosSleep(m_seconds/1000+1); -#endif -} - /* ugly long name, but we are following the convention */ int do_wait_for_slave_to_stop(struct st_query* q __attribute__((unused))) @@ -1925,7 +1913,7 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)), argument= buff; } fn_format(buff, argument, "", "", 4); - if (!(*++cur_file = my_fopen(buff, O_RDONLY | O_BINARY, MYF(MY_WME)))) + if (!(*++cur_file = my_fopen(buff, O_RDONLY | FILE_BINARY, MYF(MY_WME)))) die("Could not open %s: errno = %d", argument, errno); break; } @@ -2611,7 +2599,7 @@ static int read_server_arguments(const char* name) embedded_server_arg_count=1; embedded_server_args[0]= (char*) ""; /* Progname */ } - if (!(file=my_fopen(buff, O_RDONLY | O_BINARY, MYF(MY_WME)))) + if (!(file=my_fopen(buff, O_RDONLY | FILE_BINARY, MYF(MY_WME)))) return 1; while (embedded_server_arg_count < MAX_SERVER_ARGS && (str=fgets(argument,sizeof(argument), file))) diff --git a/configure.in b/configure.in index 212737535a6..409bd166a8a 100644 --- a/configure.in +++ b/configure.in @@ -38,9 +38,18 @@ rm -f $AVAILABLE_LANGUAGES_ERRORS_RULES for i in $AVAILABLE_LANGUAGES do AVAILABLE_LANGUAGES_ERRORS="$AVAILABLE_LANGUAGES_ERRORS $i/errmsg.sys" + case $SYSTEM_TYPE in + *netware* | *modesto*) + echo "$i/errmsg.sys: $i/errmsg.txt + \$(top_builddir)/extra/comp_err.cyg \$^ $i/errmsg.sys" \ + >> $AVAILABLE_LANGUAGES_ERRORS_RULES + ;; + *) echo "$i/errmsg.sys: $i/errmsg.txt \$(top_builddir)/extra/comp_err \$^ $i/errmsg.sys" \ >> $AVAILABLE_LANGUAGES_ERRORS_RULES + ;; + esac done ##### @@ -130,7 +139,14 @@ AC_PROG_CXX AC_PROG_CPP # Print version of CC and CXX compiler (if they support --version) +case $SYSTEM_TYPE in + *netware*) +CC_VERSION=`$CC -version | grep -i version` + ;; + *) CC_VERSION=`$CC --version | sed 1q` + ;; +esac if test $? -eq "0" then AC_MSG_CHECKING("C Compiler version"); @@ -138,7 +154,14 @@ then else CC_VERSION="" fi +case $SYSTEM_TYPE in + *netware*) +CXX_VERSION=`$CXX -version | grep -i version` + ;; + *) CXX_VERSION=`$CXX --version | sed 1q` + ;; +esac if test $? -eq "0" then AC_MSG_CHECKING("C++ compiler version"); @@ -186,6 +209,11 @@ AC_CHECK_PROG(DVIS, tex, manual.dvi) AC_MSG_CHECKING("return type of sprintf") #check the return type of sprintf +case $SYSTEM_TYPE in + *netware*) + AC_DEFINE(SPRINTF_RETURNS_INT) AC_MSG_RESULT("int") + ;; + *) AC_TRY_RUN([ int main() { @@ -205,11 +233,13 @@ AC_DEFINE(SPRINTF_RETURNS_INT) AC_MSG_RESULT("int"), char buf[6]; if((char*)sprintf(buf,s) == buf + strlen(s)) return 0; - return -1; + return -1; } ], AC_DEFINE(SPRINTF_RETURNS_PTR) AC_MSG_RESULT("ptr"), AC_DEFINE(SPRINTF_RETURNS_GARBAGE) AC_MSG_RESULT("garbage"))) - + ;; +esac + # option, cache_name, variable, # code to execute if yes, code to exectute if fail @@ -361,10 +391,12 @@ dnl Find paths to some shell programs AC_PATH_PROG(LN, ln, ln) # This must be able to take a -f flag like normal unix ln. AC_PATH_PROG(LN_CP_F, ln, ln) +if ! ( expr "$SYSTEM_TYPE" : ".*netware.*" > /dev/null ); then # If ln -f does not exists use -s (AFS systems) if test -n "$LN_CP_F"; then LN_CP_F="$LN_CP_F -s" fi +fi AC_PATH_PROG(MV, mv, mv) AC_PATH_PROG(RM, rm, rm) @@ -429,6 +461,9 @@ else *cygwin*) FIND_PROC="$PS -e | grep mysqld | grep \" \$\$PID \" > /dev/null" ;; + *netware* | *modesto*) + FIND_PROC= + ;; *) AC_MSG_ERROR([Could not find the right ps switches. Which OS is this ?. See the Installation chapter in the Reference Manual.]) esac @@ -856,6 +891,11 @@ fi NON_THREADED_CLIENT_LIBS="$LIBS" AC_MSG_CHECKING([for int8]) +case $SYSTEM_TYPE in + *netware) + AC_MSG_RESULT([no]) + ;; + *) AC_TRY_RUN([ #ifdef HAVE_STDLIB_H #include <stdlib.h> @@ -876,6 +916,8 @@ int main() } ], AC_DEFINE(HAVE_INT_8_16_32) AC_MSG_RESULT([yes]), AC_MSG_RESULT([no]) ) + ;; +esac # # Some system specific hacks @@ -1025,6 +1067,107 @@ dnl Is this the right match for DEC OSF on alpha? CFLAGS="$CFLAGS -DUNDEF_HAVE_GETHOSTBYNAME_R" CXXFLAGS="$CXXFLAGS -DUNDEF_HAVE_GETHOSTBYNAME_R" ;; + *netware*) + # No need for curses library so set it to null + with_named_curses="" + + # + # Edit Makefile.in files. + # + echo -n "configuring Makefile.in files for NetWare... " + for file in sql/Makefile.in libmysql/Makefile.in libmysql_r/Makefile.in sql/share/Makefile.in strings/Makefile.in client/Makefile.in + do + # echo "#### $file ####" + filedir="`dirname $file`" + filebase="`basename $file`" + filesed=$filedir/$filebase.sed + # + # Backup and always use original file + # + if test -f $file.bk + then + cp -fp $file.bk $file + else + cp -fp $file $file.bk + fi + case $file in + sql/Makefile.in) + # Use gen_lex_hash.cyg instead of gen_lex_hash + # Add library dependencies to mysqld_DEPENDENCIES + lib_DEPENDENCIES="\$(bdb_libs_with_path) \$(innodb_libs) \$(pstack_libs) \$(innodb_system_libs) \$(openssl_libs)" + cat > $filesed << EOF +s,\(^.*\$(MAKE) gen_lex_hash\),#\1, +s,\(\./gen_lex_hash\),\1.cyg, +s%\(mysqld_DEPENDENCIES = \) %\1$lib_DEPENDENCIES % +EOF + ;; + sql/share/Makefile.in) + cat > $filesed << EOF +s,\(extra/comp_err\),\1.cyg, +EOF + ;; + libmysql/Makefile.in) + cat > $filesed << EOF +s,\(\./conf_to_src\)\( \$(top_srcdir)\),\1.cyg\2, +s,\(: conf_to_src\),\1.cyg, +EOF + ;; + libmysql_r/Makefile.in) + cat > $filesed << EOF +s,\(\./conf_to_src\)\( \$(top_srcdir)\),\1.cyg\2, +s,\(: conf_to_src\),\1.cyg, +EOF + ;; + strings/Makefile.in) + cat > $filesed << EOF +s,\(\./conf_to_src\)\( \$(top_srcdir)\),\1.cyg\2, +s,\(: conf_to_src\),\1.cyg, +EOF + ;; + client/Makefile.in) + # + cat > $filesed << EOF +s,libmysqlclient.la,.libs/libmysqlclient.a, +EOF + ;; + esac + if `sed -f $filesed $file > $file.nw`;\ + then + mv -f $file.nw $file + rm -f $filesed + else + exit 1 + fi + # wait for file system changes to complete + sleep 1 + done + echo "done" + + # + # Make sure the following files are writable. + # + # When the files are retrieved from some source code control systems they are read-only. + # + echo -n "making sure specific build files are writable... " + for file in \ + Docs/include.texi \ + Docs/mysql.info \ + Docs/manual.txt \ + Docs/manual_toc.html \ + Docs/manual.html \ + Docs/INSTALL-BINARY \ + INSTALL-SOURCE \ + COPYING \ + COPYING.LIB \ + MIRRORS + do + if test -e $file; then + chmod +w $file + fi + done + echo "done" + + ;; esac @@ -1392,7 +1535,12 @@ LIBS="$my_save_LIBS" AC_SUBST(LIBDL) # System characteristics +case $SYSTEM_TYPE in + *netware* | *modesto*) ;; + *) AC_SYS_RESTARTABLE_SYSCALLS + ;; +esac # Build optimized or debug version ? # First check for gcc and g++ @@ -1417,6 +1565,13 @@ else OPTIMIZE_CXXFLAGS="-O" fi +if expr "$SYSTEM_TYPE" : ".*netware.*" > /dev/null; then + DEBUG_CFLAGS="$DEBUG_CFLAGS -DDEBUG -sym internal,codeview4" + DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -DDEBUG -sym internal,codeview4" + OPTIMIZE_CFLAGS="$OPTIMIZE_CFLAGS -DNDEBUG" + OPTIMIZE_CXXFLAGS="$OPTIMIZE_CXXFLAGS -DNDEBUG" +fi + AC_ARG_WITH(debug, [ --without-debug Build a production version without debugging code], [with_debug=$withval], @@ -1564,6 +1719,7 @@ MYSQL_CHECK_FP_EXCEPT # Do the c++ compiler have a bool type MYSQL_CXX_BOOL # Check some common bugs with gcc 2.8.# on sparc +if ! ( expr "$SYSTEM_TYPE" : ".*netware.*" > /dev/null ); then MYSQL_CHECK_LONGLONG_TO_FLOAT if test "$ac_cv_conv_longlong_to_float" != "yes" then @@ -1571,6 +1727,7 @@ then If you are using gcc 2.8.# you should upgrade to egcs 1.0.3 or newer and try again]); fi +fi MYSQL_PTHREAD_YIELD ###################################################################### @@ -2035,6 +2192,16 @@ then AC_MSG_ERROR([You can not use --with-readline and --with-libedit at the same time, please choose one of it]) fi +readline_topdir="" +readline_basedir="" +readline_dir="" +readline_h_ln_cmd="" +readline_link="" + +if expr "$SYSTEM_TYPE" : ".*netware.*" > /dev/null; then + # For NetWare, do not need readline + echo "Skipping readline" +else mkdir include/readline if [test "$with_libedit" = "yes"] || [test "$with_libedit" = "undefined"] && [test "$with_readline" = "undefined"] @@ -2064,10 +2231,7 @@ else else readline_link="-ledit" fi - readline_topdir="" - readline_basedir="" - readline_dir="" - readline_h_ln_cmd="" +fi fi AC_SUBST(readline_dir) @@ -2108,6 +2272,13 @@ AC_ARG_WITH(extra-charsets, [extra_charsets="$withval"], [extra_charsets="none"]) +AC_ARG_WITH(platform-dir, + [ --with-platform-dir=DIR + Add specified directory to list of SUBDIRS to build.], + [ with_platform_dir=$withval ], + [ with_platform_dir=no ] + ) + AC_MSG_CHECKING("character sets") if test "$extra_charsets" = none; then @@ -2289,11 +2460,18 @@ AC_SUBST(CLIENT_LIBS) AC_SUBST(sql_client_dirs) AC_SUBST(linked_client_targets) +platform_dir= +if test "$with_platform_dir" != "no" +then + platform_dir="$with_platform_dir" +fi +AC_SUBST(platform_dir) + if test "$with_server" = "yes" -o "$THREAD_SAFE_CLIENT" != "no" then AC_DEFINE(THREAD) # Avoid _PROGRAMS names - THREAD_LPROGRAMS="test_thr_alarm test_thr_lock" + THREAD_LPROGRAMS="test_thr_alarm\$(EXEEXT) test_thr_lock\$(EXEEXT)" AC_SUBST(THREAD_LPROGRAMS) THREAD_LOBJECTS="thr_alarm.o thr_lock.o thr_mutex.o thr_rwlock.o my_pthread.o my_thr_init.o" AC_SUBST(THREAD_LOBJECTS) @@ -2397,7 +2575,7 @@ EOF then innodb_conf_flags=--disable-dependency-tracking fi - (cd innobase && sh $rel_srcdir/innobase/configure $innodb_conf_flags) \ + (cd innobase && sh $rel_srcdir/innobase/configure --host=$host $innodb_conf_flags) \ || AC_MSG_ERROR([could not configure INNODB]) echo "END OF INNODB CONFIGURATION" @@ -2471,20 +2649,20 @@ then AC_OUTPUT(cmd-line-utils/Makefile) fi -AC_OUTPUT(Makefile extra/Makefile mysys/Makefile isam/Makefile \ - strings/Makefile regex/Makefile heap/Makefile \ - bdb/Makefile \ - myisam/Makefile myisammrg/Makefile \ - os2/Makefile os2/include/Makefile os2/include/sys/Makefile \ - man/Makefile BUILD/Makefile vio/Makefile \ - libmysql_r/Makefile libmysqld/Makefile libmysqld/examples/Makefile \ - libmysql/Makefile client/Makefile \ - pstack/Makefile pstack/aout/Makefile sql/Makefile sql/share/Makefile \ - merge/Makefile dbug/Makefile scripts/Makefile \ - include/Makefile sql-bench/Makefile tools/Makefile \ - tests/Makefile Docs/Makefile support-files/Makefile \ - mysql-test/Makefile \ - include/mysql_version.h +AC_OUTPUT(Makefile extra/Makefile mysys/Makefile isam/Makefile dnl + strings/Makefile regex/Makefile heap/Makefile dnl + bdb/Makefile dnl + myisam/Makefile myisammrg/Makefile dnl + os2/Makefile os2/include/Makefile os2/include/sys/Makefile dnl + man/Makefile BUILD/Makefile vio/Makefile dnl + libmysql_r/Makefile libmysqld/Makefile libmysqld/examples/Makefile dnl + libmysql/Makefile client/Makefile dnl + pstack/Makefile pstack/aout/Makefile sql/Makefile sql/share/Makefile dnl + merge/Makefile dbug/Makefile scripts/Makefile dnl + include/Makefile sql-bench/Makefile tools/Makefile dnl + tests/Makefile Docs/Makefile support-files/Makefile dnl + mysql-test/Makefile dnl + include/mysql_version.h dnl , , [ test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h ]) diff --git a/extra/perror.c b/extra/perror.c index e22ce467949..a2951bff66a 100644 --- a/extra/perror.c +++ b/extra/perror.c @@ -59,8 +59,10 @@ static HA_ERRORS ha_errlist[]= { 121,"Duplicate key on write or update" }, { 123,"Someone has changed the row since it was read; Update with is recoverable" }, { 124,"Wrong index given to function" }, - { 126,"Index file is crashed / Wrong file format" }, + { 126,"Index file is crashed" }, { 127,"Record-file is crashed" }, + { 128,"Out of memory" }, + { 130,"Incorrect file format" }, { 131,"Command not supported by database" }, { 132,"Old database file" }, { 133,"No record read before update" }, @@ -73,7 +75,7 @@ static HA_ERRORS ha_errlist[]= { 140,"Wrong create options"}, { 141,"Duplicate unique key or constraint on write or update"}, { 142,"Unknown character set used"}, - { 143,"Conflicting table definition between MERGE and mapped table"}, + { 143,"Conflicting table definitions in sub-tables of MERGE table"}, { 144,"Table is crashed and last repair failed"}, { 145,"Table was marked as crashed and should be repaired"}, { 146,"Lock timed out; Retry transaction"}, @@ -81,6 +83,8 @@ static HA_ERRORS ha_errlist[]= { 148,"Updates are not allowed under a read only transactions"}, { 149,"Lock deadlock; Retry transaction"}, { 150,"Foreign key constraint is incorrectly formed"}, + { 151,"Cannot add a child row"}, + { 152,"Cannot delete a parent row"}, { -30999, "DB_INCOMPLETE: Sync didn't finish"}, { -30998, "DB_KEYEMPTY: Key/data deleted or never created"}, { -30997, "DB_KEYEXIST: The key/data pair already exists"}, diff --git a/extra/resolveip.c b/extra/resolveip.c index 17bf087bd19..c9446b0fdf2 100644 --- a/extra/resolveip.c +++ b/extra/resolveip.c @@ -16,7 +16,7 @@ /* Resolves IP's to hostname and hostnames to IP's */ -#define RESOLVE_VERSION "2.2" +#define RESOLVE_VERSION "2.3" #include <my_global.h> #include <m_ctype.h> @@ -147,8 +147,11 @@ int main(int argc, char **argv) else { printf ("Host name of %s is %s", ip,hpaddr->h_name); +#ifndef __NETWARE__ + /* this information is not available on NetWare */ for (q = hpaddr->h_aliases; *q != 0; q++) (void) printf(", %s", *q); +#endif /* __NETWARE__ */ puts(""); } } diff --git a/include/Makefile.am b/include/Makefile.am index e197cee4cde..8220424354d 100644 --- a/include/Makefile.am +++ b/include/Makefile.am @@ -22,7 +22,7 @@ pkginclude_HEADERS = dbug.h m_string.h my_sys.h my_list.h my_xml.h \ errmsg.h my_global.h my_net.h my_alloc.h \ my_getopt.h sslopt-longopts.h typelib.h \ sslopt-vars.h sslopt-case.h $(BUILT_SOURCES) -noinst_HEADERS = config-win.h config-os2.h \ +noinst_HEADERS = config-win.h config-os2.h config-netware.h \ nisam.h heap.h merge.h my_bitmap.h\ myisam.h myisampack.h myisammrg.h ft_global.h\ my_dir.h mysys_err.h my_base.h \ diff --git a/include/config-netware.h b/include/config-netware.h new file mode 100644 index 00000000000..57bf500da47 --- /dev/null +++ b/include/config-netware.h @@ -0,0 +1,86 @@ +/* Copyright (C) 2000 MySQL AB + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ + +/* Defines for netware compatible with MySQL */ + +/* required headers */ +#include <unistd.h> +#include <stdio.h> +#include <errno.h> +#include <screen.h> +#include <limits.h> +#include <nks/synch.h> +#include <nks/thread.h> +#include <signal.h> +#include <errno.h> +#include <stdbool.h> +#include <stdlib.h> +#include <nks/errno.h> +#include <sys/types.h> +#include <time.h> +#include <sys/time.h> +#include <nks/time.h> +#include <pthread.h> +#include <termios.h> + +/* required adjustments */ +#undef HAVE_READDIR_R +#undef HAVE_RWLOCK_INIT +#undef HAVE_SCHED_H +#undef HAVE_SYS_MMAN_H +#undef HAVE_SYNCH_H +#undef HAVE_CRYPT +#define HAVE_PTHREAD_ATTR_SETSTACKSIZE 1 +#define HAVE_PTHREAD_SIGMASK 1 +#define HAVE_PTHREAD_YIELD_ZERO_ARG 1 +#define HAVE_BROKEN_REALPATH 1 + +/* no case sensitivity */ +#define FN_NO_CASE_SENCE 1 + +/* the thread alarm is not used */ +#define DONT_USE_THR_ALARM 1 + +/* signals do not interrupt sockets */ +#define SIGNALS_DONT_BREAK_READ 1 + +/* signal by closing the sockets */ +#define SIGNAL_WITH_VIO_CLOSE 1 + +/* default directory information */ +#define DEFAULT_MYSQL_HOME "sys:/mysql" +#define PACKAGE "mysql" +#define DEFAULT_BASEDIR "sys:/" +#define SHAREDIR "share/" +#define DEFAULT_CHARSET_HOME "sys:/mysql/" +#define DATADIR "data/" + +/* 64-bit file system calls */ +#define SIZEOF_OFF_T 8 +#define off_t off64_t +#define chsize chsize64 +#define ftruncate ftruncate64 +#define lseek lseek64 +#define pread pread64 +#define pwrite pwrite64 +#define tell tell64 + +/* do not use the extended time in LibC sys\stat.h */ +#define _POSIX_SOURCE + +/* Some macros for portability */ + +#define set_timespec(ABSTIME,SEC) { (ABSTIME).tv_sec=(SEC); (ABSTIME).tv_nsec=0; } diff --git a/include/config-win.h b/include/config-win.h index 172209a210c..c1939e9116f 100644 --- a/include/config-win.h +++ b/include/config-win.h @@ -189,6 +189,8 @@ inline double ulonglong2double(ulonglong value) #define tell(A) _telli64(A) #endif +#define set_timespec(ABSTIME,SEC) { (ABSTIME).tv_sec=time((time_t*)0) + (time_t) (SEC); (ABSTIME).tv_nsec=0; } + #define STACK_DIRECTION -1 /* Optimized store functions for Intel x86 */ @@ -284,6 +286,7 @@ inline double ulonglong2double(ulonglong value) #define my_reinterpret_cast(A) reinterpret_cast <A> #define my_const_cast(A) const_cast<A> + /* MYSQL OPTIONS */ #ifdef _CUSTOMCONFIG_ diff --git a/include/ft_global.h b/include/ft_global.h index 449cc57729f..9acdf6aaaf3 100644 --- a/include/ft_global.h +++ b/include/ft_global.h @@ -46,6 +46,7 @@ struct st_ft_info }; #endif +extern const char *ft_stopword_file; extern const char *ft_precompiled_stopwords[]; extern ulong ft_min_word_len; @@ -53,7 +54,7 @@ extern ulong ft_max_word_len; extern ulong ft_max_word_len_for_sort; extern const char *ft_boolean_syntax; -int ft_init_stopwords(const char **); +int ft_init_stopwords(void); void ft_free_stopwords(void); #define FT_NL 0 diff --git a/include/my_base.h b/include/my_base.h index b16a545b937..f167ae3d30e 100644 --- a/include/my_base.h +++ b/include/my_base.h @@ -217,6 +217,7 @@ enum ha_base_keytype { #define HA_ERR_CRASHED 126 /* Indexfile is crashed */ #define HA_ERR_WRONG_IN_RECORD 127 /* Record-file is crashed */ #define HA_ERR_OUT_OF_MEM 128 /* Record-file is crashed */ +#define HA_ERR_NOT_A_TABLE 130 /* not a MYI file - no signature */ #define HA_ERR_WRONG_COMMAND 131 /* Command not supported */ #define HA_ERR_OLD_FILE 132 /* old databasfile */ #define HA_ERR_NO_ACTIVE_RECORD 133 /* No record read in update() */ @@ -229,7 +230,7 @@ enum ha_base_keytype { #define HA_WRONG_CREATE_OPTION 140 /* Wrong create option */ #define HA_ERR_FOUND_DUPP_UNIQUE 141 /* Dupplicate unique on write */ #define HA_ERR_UNKNOWN_CHARSET 142 /* Can't open charset */ -#define HA_ERR_WRONG_TABLE_DEF 143 +#define HA_ERR_WRONG_MRG_TABLE_DEF 143 /* conflicting MyISAM tables in MERGE */ #define HA_ERR_CRASHED_ON_REPAIR 144 /* Last (automatic?) repair failed */ #define HA_ERR_CRASHED_ON_USAGE 145 /* Table must be repaired */ #define HA_ERR_LOCK_WAIT_TIMEOUT 146 diff --git a/include/my_global.h b/include/my_global.h index e2b59dc220f..0b423655281 100644 --- a/include/my_global.h +++ b/include/my_global.h @@ -56,6 +56,12 @@ #include <config-win.h> #elif defined(OS2) #include <config-os2.h> +#elif defined(__NETWARE__) +#include <my_config.h> +#include <config-netware.h> +#if defined(__cplusplus) && defined(inline) +#undef inline /* fix configure problem */ +#endif #else #include <my_config.h> #if defined(__cplusplus) && defined(inline) @@ -447,17 +453,20 @@ typedef SOCKET_SIZE_TYPE size_socket; /* file create flags */ -#ifndef O_SHARE +#ifndef O_SHARE /* Probably not windows */ #define O_SHARE 0 /* Flag to my_open for shared files */ #ifndef O_BINARY #define O_BINARY 0 /* Flag to my_open for binary files */ #endif -#define FILE_BINARY 0 /* Flag to my_fopen for binary streams */ +#ifndef FILE_BINARY +#define FILE_BINARY O_BINARY /* Flag to my_fopen for binary streams */ +#endif #ifdef HAVE_FCNTL #define HAVE_FCNTL_LOCK #define F_TO_EOF 0L /* Param to lockf() to lock rest of file */ #endif #endif /* O_SHARE */ + #ifndef O_TEMPORARY #define O_TEMPORARY 0 #endif @@ -800,10 +809,9 @@ typedef char bool; /* Ordinary boolean values 0 1 */ #define MY_HOW_OFTEN_TO_ALARM 2 /* How often we want info on screen */ #define MY_HOW_OFTEN_TO_WRITE 1000 /* How often we want info on screen */ +#ifndef set_timespec #ifdef HAVE_TIMESPEC_TS_SEC #define set_timespec(ABSTIME,SEC) { (ABSTIME).ts_sec=time(0) + (time_t) (SEC); (ABSTIME).ts_nsec=0; } -#elif defined(__WIN__) -#define set_timespec(ABSTIME,SEC) { (ABSTIME).tv_sec=time((time_t*)0) + (time_t) (SEC); (ABSTIME).tv_nsec=0; } #else #define set_timespec(ABSTIME,SEC) \ {\ @@ -812,7 +820,8 @@ typedef char bool; /* Ordinary boolean values 0 1 */ (ABSTIME).tv_sec=tv.tv_sec+(time_t) (SEC);\ (ABSTIME).tv_nsec=tv.tv_usec*1000;\ } -#endif +#endif /* HAVE_TIMESPEC_TS_SEC */ +#endif /* set_timespec */ /* Define-funktions for reading and storing in machine independent format diff --git a/include/my_net.h b/include/my_net.h index ec985ded76b..28d862d8528 100644 --- a/include/my_net.h +++ b/include/my_net.h @@ -44,7 +44,7 @@ C_MODE_START #include <sys/ioctl.h> #endif -#if !defined(MSDOS) && !defined(__WIN__) && !defined(HAVE_BROKEN_NETINET_INCLUDES) && !defined(__BEOS__) +#if !defined(MSDOS) && !defined(__WIN__) && !defined(HAVE_BROKEN_NETINET_INCLUDES) && !defined(__BEOS__) && !defined(__NETWARE__) #include <netinet/in_systm.h> #include <netinet/in.h> #include <netinet/ip.h> diff --git a/include/my_pthread.h b/include/my_pthread.h index 355d7c2e147..e4d8069096b 100644 --- a/include/my_pthread.h +++ b/include/my_pthread.h @@ -357,6 +357,14 @@ extern int my_pthread_cond_timedwait(pthread_cond_t *cond, #define pthread_cond_timedwait(A,B,C) my_pthread_cond_timedwait((A),(B),(C)) #endif + +#ifdef __NETWARE__ +extern int my_pthread_cond_timedwait(pthread_cond_t *cond, + pthread_mutex_t *mutex, + struct timespec *abstime); +#define pthread_cond_timedwait(A,B,C) my_pthread_cond_timedwait((A),(B),(C)) +#endif /* __NETWARE__ */ + #if defined(OS2) #define my_pthread_getspecific(T,A) ((T) &(A)) #define pthread_setspecific(A,B) win_pthread_setspecific(&(A),(B),sizeof(A)) @@ -444,15 +452,39 @@ int my_pthread_mutex_trylock(pthread_mutex_t *mutex); /* safe_mutex adds checking to mutex for easier debugging */ +#if defined(__NETWARE__) && !defined(SAFE_MUTEX_DETECT_DESTROY) +#define SAFE_MUTEX_DETECT_DESTROY +#endif + typedef struct st_safe_mutex_t { pthread_mutex_t global,mutex; char *file; uint line,count; pthread_t thread; +#ifdef SAFE_MUTEX_DETECT_DESTROY + struct st_safe_mutex_info_t *info; /* to track destroying of mutexes */ +#endif } safe_mutex_t; -int safe_mutex_init(safe_mutex_t *mp, const pthread_mutexattr_t *attr); +#ifdef SAFE_MUTEX_DETECT_DESTROY +/* + Used to track the destroying of mutexes. This needs to be a seperate + structure because the safe_mutex_t structure could be freed before + the mutexes are destroyed. +*/ + +typedef struct st_safe_mutex_info_t +{ + struct st_safe_mutex_info_t *next; + struct st_safe_mutex_info_t *prev; + char *init_file; + uint32 init_line; +} safe_mutex_info_t; +#endif /* SAFE_MUTEX_DETECT_DESTROY */ + +int safe_mutex_init(safe_mutex_t *mp, const pthread_mutexattr_t *attr, + const char *file, uint line); int safe_mutex_lock(safe_mutex_t *mp,const char *file, uint line); int safe_mutex_unlock(safe_mutex_t *mp,const char *file, uint line); int safe_mutex_destroy(safe_mutex_t *mp,const char *file, uint line); @@ -460,6 +492,8 @@ int safe_cond_wait(pthread_cond_t *cond, safe_mutex_t *mp,const char *file, uint line); int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp, struct timespec *abstime, const char *file, uint line); +void safe_mutex_global_init(void); +void safe_mutex_end(FILE *file); /* Wrappers if safe mutex is actually used */ #ifdef SAFE_MUTEX @@ -473,7 +507,7 @@ int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp, #undef pthread_cond_wait #undef pthread_cond_timedwait #undef pthread_mutex_trylock -#define pthread_mutex_init(A,B) safe_mutex_init((A),(B)) +#define pthread_mutex_init(A,B) safe_mutex_init((A),(B),__FILE__,__LINE__) #define pthread_mutex_lock(A) safe_mutex_lock((A),__FILE__,__LINE__) #define pthread_mutex_unlock(A) safe_mutex_unlock((A),__FILE__,__LINE__) #define pthread_mutex_destroy(A) safe_mutex_destroy((A),__FILE__,__LINE__) diff --git a/include/my_sys.h b/include/my_sys.h index 9a688ea6e78..7e6202c0d03 100644 --- a/include/my_sys.h +++ b/include/my_sys.h @@ -326,7 +326,7 @@ typedef struct st_io_cache_share /* to sync on reads into buffer */ pthread_mutex_t mutex; pthread_cond_t cond; - int count; + int count, total; /* actual IO_CACHE that filled the buffer */ struct st_io_cache *active; #ifdef NOT_YET_IMPLEMENTED @@ -724,29 +724,32 @@ extern void my_free_lock(byte *ptr,myf flags); #define my_free_lock(A,B) my_free((A),(B)) #endif #define alloc_root_inited(A) ((A)->min_malloc != 0) -void init_alloc_root(MEM_ROOT *mem_root, uint block_size, uint pre_alloc_size); -gptr alloc_root(MEM_ROOT *mem_root,unsigned int Size); -void free_root(MEM_ROOT *root, myf MyFLAGS); -void set_prealloc_root(MEM_ROOT *root, char *ptr); -char *strdup_root(MEM_ROOT *root,const char *str); -char *strmake_root(MEM_ROOT *root,const char *str,uint len); -char *memdup_root(MEM_ROOT *root,const char *str,uint len); -void load_defaults(const char *conf_file, const char **groups, - int *argc, char ***argv); -void free_defaults(char **argv); -void print_defaults(const char *conf_file, const char **groups); -my_bool my_compress(byte *, ulong *, ulong *); -my_bool my_uncompress(byte *, ulong *, ulong *); -byte *my_compress_alloc(const byte *packet, ulong *len, ulong *complen); -ulong checksum(const byte *mem, uint count); -uint my_bit_log2(ulong value); - -#if defined(_MSC_VER) && !defined(__WIN__) -extern void sleep(int sec); -#endif +extern void init_alloc_root(MEM_ROOT *mem_root, uint block_size, + uint pre_alloc_size); +extern gptr alloc_root(MEM_ROOT *mem_root,unsigned int Size); +extern void free_root(MEM_ROOT *root, myf MyFLAGS); +extern void set_prealloc_root(MEM_ROOT *root, char *ptr); +extern char *strdup_root(MEM_ROOT *root,const char *str); +extern char *strmake_root(MEM_ROOT *root,const char *str,uint len); +extern char *memdup_root(MEM_ROOT *root,const char *str,uint len); +extern void load_defaults(const char *conf_file, const char **groups, + int *argc, char ***argv); +extern void free_defaults(char **argv); +extern void print_defaults(const char *conf_file, const char **groups); +extern my_bool my_compress(byte *, ulong *, ulong *); +extern my_bool my_uncompress(byte *, ulong *, ulong *); +extern byte *my_compress_alloc(const byte *packet, ulong *len, ulong *complen); +extern ulong checksum(const byte *mem, uint count); +extern uint my_bit_log2(ulong value); +extern void my_sleep(ulong m_seconds); + #ifdef __WIN__ extern my_bool have_tcpip; /* Is set if tcpip is used */ #endif +#ifdef __NETWARE__ +void netware_reg_user(const char *ip, const char *user, + const char *application); +#endif C_MODE_END #include "raid.h" diff --git a/include/mysql.h b/include/mysql.h index 69560232d1b..d4236a3f5b2 100644 --- a/include/mysql.h +++ b/include/mysql.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -66,6 +66,10 @@ typedef int my_socket; extern unsigned int mysql_port; extern char *mysql_unix_port; +#ifdef __NETWARE__ +#pragma pack(push, 8) /* 8 byte alignment */ +#endif + #define IS_PRI_KEY(n) ((n) & PRI_KEY_FLAG) #define IS_NOT_NULL(n) ((n) & NOT_NULL_FLAG) #define IS_BLOB(n) ((n) & BLOB_FLAG) @@ -584,6 +588,11 @@ my_bool simple_command(MYSQL *mysql,enum enum_server_command command, const char *arg, unsigned long length, my_bool skip_check); unsigned long net_safe_read(MYSQL* mysql); +void STDCALL mysql_once_init(void); + +#ifdef __NETWARE__ +#pragma pack(pop) /* restore alignment */ +#endif #ifdef __cplusplus } diff --git a/innobase/btr/btr0cur.c b/innobase/btr/btr0cur.c index 2416149c3a8..69952c842ce 100644 --- a/innobase/btr/btr0cur.c +++ b/innobase/btr/btr0cur.c @@ -607,11 +607,11 @@ btr_cur_open_at_index_side( page_cur_set_after_last(page, page_cursor); } - if (estimate) { - btr_cur_add_path_info(cursor, height, root_height); - } - if (height == 0) { + if (estimate) { + btr_cur_add_path_info(cursor, height, + root_height); + } break; } @@ -624,6 +624,10 @@ btr_cur_open_at_index_side( page_cur_move_to_prev(page_cursor); } + if (estimate) { + btr_cur_add_path_info(cursor, height, root_height); + } + height--; node_ptr = page_cur_get_rec(page_cursor); diff --git a/innobase/configure.in b/innobase/configure.in index 59d213fef12..29309a2c0a5 100644 --- a/innobase/configure.in +++ b/innobase/configure.in @@ -110,14 +110,14 @@ case "$target" in CFLAGS="$CFLAGS -DUNIV_INTEL_X86";; esac -AC_OUTPUT(Makefile os/Makefile ut/Makefile btr/Makefile - buf/Makefile com/Makefile data/Makefile - dict/Makefile dyn/Makefile - eval/Makefile fil/Makefile fsp/Makefile fut/Makefile - ha/Makefile ibuf/Makefile include/Makefile - lock/Makefile log/Makefile - mach/Makefile mem/Makefile mtr/Makefile odbc/Makefile - page/Makefile pars/Makefile que/Makefile - read/Makefile rem/Makefile row/Makefile - srv/Makefile sync/Makefile thr/Makefile trx/Makefile +AC_OUTPUT(Makefile os/Makefile ut/Makefile btr/Makefile dnl + buf/Makefile com/Makefile data/Makefile dnl + dict/Makefile dyn/Makefile dnl + eval/Makefile fil/Makefile fsp/Makefile fut/Makefile dnl + ha/Makefile ibuf/Makefile include/Makefile dnl + lock/Makefile log/Makefile dnl + mach/Makefile mem/Makefile mtr/Makefile odbc/Makefile dnl + page/Makefile pars/Makefile que/Makefile dnl + read/Makefile rem/Makefile row/Makefile dnl + srv/Makefile sync/Makefile thr/Makefile trx/Makefile dnl usr/Makefile) diff --git a/innobase/include/os0thread.h b/innobase/include/os0thread.h index efc8651e06d..629cfef23a8 100644 --- a/innobase/include/os0thread.h +++ b/innobase/include/os0thread.h @@ -15,9 +15,10 @@ Created 9/8/1995 Heikki Tuuri /* Maximum number of threads which can be created in the program; this is also the size of the wait slot array for MySQL threads which can wait inside InnoDB */ -#ifdef __WIN__ +#if defined(__WIN__) || defined(__NETWARE__) /* Create less event semaphores because Win 98/ME had difficult creating 40000 event semaphores */ +/* TODO: these just take a lot of memory on NetWare. should netware move up? */ #define OS_THREAD_MAX_N 1000 #else #define OS_THREAD_MAX_N 10000 diff --git a/innobase/os/os0file.c b/innobase/os/os0file.c index 9eae358c7fb..82ed957b5fb 100644 --- a/innobase/os/os0file.c +++ b/innobase/os/os0file.c @@ -8,6 +8,7 @@ Created 10/21/1995 Heikki Tuuri #include "os0file.h" #include "os0sync.h" +#include "os0thread.h" #include "ut0mem.h" #include "srv0srv.h" #include "fil0fil.h" @@ -1093,6 +1094,7 @@ os_file_write( DWORD low; DWORD high; ulint i; + ulint n_retries = 0; ut_a((offset & 0xFFFFFFFF) == offset); @@ -1101,7 +1103,7 @@ os_file_write( ut_ad(file); ut_ad(buf); ut_ad(n > 0); - +retry: low = offset; high = offset_high; @@ -1145,6 +1147,19 @@ os_file_write( return(TRUE); } + /* If some background file system backup tool is running, then, at + least in Windows 2000, we may get here a specific error. Let us + retry the operation 100 times, with 1 second waits. */ + + if (GetLastError() == ERROR_LOCK_VIOLATION && n_retries < 100) { + + os_thread_sleep(1000000); + + n_retries++; + + goto retry; + } + if (!os_has_said_disk_full) { ut_print_timestamp(stderr); @@ -1157,7 +1172,7 @@ os_file_write( "InnoDB: what the error number means.\n" "InnoDB: Check that your OS and file system support files of this size.\n" "InnoDB: Check also that the disk is not full or a disk quota exceeded.\n", - name, offset_high, offset, n, len, + name, offset_high, offset, n, (ulint)len, (ulint)GetLastError()); os_has_said_disk_full = TRUE; @@ -1180,13 +1195,13 @@ os_file_write( fprintf(stderr, " InnoDB: Error: Write to file %s failed at offset %lu %lu.\n" -"InnoDB: %lu bytes should have been written, only %lu were written.\n" +"InnoDB: %lu bytes should have been written, only %ld were written.\n" "InnoDB: Operating system error number %lu.\n" "InnoDB: Look from section 13.2 at http://www.innodb.com/ibman.html\n" "InnoDB: what the error number means or use the perror program of MySQL.\n" "InnoDB: Check that your OS and file system support files of this size.\n" "InnoDB: Check also that the disk is not full or a disk quota exceeded.\n", - name, offset_high, offset, n, (ulint)ret, + name, offset_high, offset, n, (long int)ret, (ulint)errno); os_has_said_disk_full = TRUE; } diff --git a/innobase/os/os0sync.c b/innobase/os/os0sync.c index bac1f23a1af..a9127e6310a 100644 --- a/innobase/os/os0sync.c +++ b/innobase/os/os0sync.c @@ -495,6 +495,8 @@ os_fast_mutex_free( ut_a(fast_mutex); DeleteCriticalSection((LPCRITICAL_SECTION) fast_mutex); +#elif defined(__NETWARE__) || defined(SAFE_MUTEX_DETECT_DESTROY) + pthread_mutex_destroy(fast_mutex); #else UT_NOT_USED(fast_mutex); diff --git a/innobase/os/os0thread.c b/innobase/os/os0thread.c index 30404c4e66b..b0076921e43 100644 --- a/innobase/os/os0thread.c +++ b/innobase/os/os0thread.c @@ -214,6 +214,8 @@ os_thread_sleep( { #ifdef __WIN__ Sleep(tm / 1000); +#elif defined(__NETWARE__) + delay(tm / 1000); #else struct timeval t; diff --git a/innobase/srv/srv0srv.c b/innobase/srv/srv0srv.c index 2bdcbe29758..af11516e9f0 100644 --- a/innobase/srv/srv0srv.c +++ b/innobase/srv/srv0srv.c @@ -1712,8 +1712,63 @@ srv_general_init(void) thr_local_init(); } + +#if defined(__NETWARE__) || defined(SAFE_MUTEX_DETECT_DESTROY) +/* NetWare requires some cleanup of mutexes */ + +/************************************************************************* +Deinitializes the synchronization primitives, memory system, and the thread +local storage. */ + +void +srv_general_free(void) +/*==================*/ +{ + sync_close(); +} +#endif /* __NETWARE__ */ + + /*======================= InnoDB Server FIFO queue =======================*/ +#if defined(__NETWARE__) || defined(SAFE_MUTEX_DETECT_DESTROY) +/* NetWare requires some cleanup of mutexes */ + +/************************************************************************* +Deinitializes the server. */ + +void +srv_free(void) +/*==========*/ +{ + srv_conc_slot_t* conc_slot; + srv_slot_t* slot; + ulint i; + + for (i = 0; i < OS_THREAD_MAX_N; i++) + { + slot = srv_table_get_nth_slot(i); + os_event_free(slot->event); + } + + /* TODO: free(srv_sys->threads); */ + + for (i = 0; i < OS_THREAD_MAX_N; i++) + { + slot = srv_mysql_table + i; + os_event_free(slot->event); + } + + /* TODO: free(srv_mysql_table); */ + + for (i = 0; i < OS_THREAD_MAX_N; i++) + { + conc_slot = srv_conc_slots + i; + os_event_free(conc_slot->event); + } +} +#endif /* __NETWARE__ */ + /************************************************************************* Puts an OS thread to wait if there are too many concurrent threads (>= srv_thread_concurrency) inside InnoDB. The threads wait in a FIFO queue. */ diff --git a/innobase/srv/srv0start.c b/innobase/srv/srv0start.c index d855a6aece5..671ef4e5b22 100644 --- a/innobase/srv/srv0start.c +++ b/innobase/srv/srv0start.c @@ -1454,6 +1454,10 @@ innobase_start_or_create_for_mysql(void) os_fast_mutex_unlock(&srv_os_test_mutex); +#if defined(__NETWARE__) || defined(SAFE_MUTEX_DETECT_DESTROY) + os_fast_mutex_free(&srv_os_test_mutex); /* all platforms? */ +#endif /* __NETWARE__ */ + if (srv_print_verbose_log) { ut_print_timestamp(stderr); fprintf(stderr, " InnoDB: Started\n"); @@ -1500,12 +1504,28 @@ innobase_shutdown_for_mysql(void) srv_conc_n_threads); } +#if defined(__NETWARE__) || defined(SAFE_MUTEX_DETECT_DESTROY) + /* + TODO: Fix this temporary solution + We are having a race condition occure with io_handler_thread threads. + When they yield in os_aio_simulated_handle during shutdown, this + thread was able to free the memory early. + */ + os_thread_yield(); + + /* TODO: Where should this be called? */ + srv_free(); + + /* TODO: Where should this be called? */ + srv_general_free(); +#endif /* TODO: We should exit the i/o-handler and other utility threads before freeing all memory. Now this can potentially cause a seg fault! */ -#ifdef NOT_WORKING_YET +#if defined(NOT_WORKING_YET) || defined(__NETWARE__) || defined(SAFE_MUTEX_DETECT_DESTROY) + /* NetWare requires this free */ ut_free_all_mem(); #endif diff --git a/innobase/sync/sync0sync.c b/innobase/sync/sync0sync.c index 376be2e723a..20d68ba5a9f 100644 --- a/innobase/sync/sync0sync.c +++ b/innobase/sync/sync0sync.c @@ -220,7 +220,7 @@ mutex_create_func( char* cfile_name, /* in: file name where created */ ulint cline) /* in: file line where created */ { -#if defined(_WIN32) && defined(UNIV_CAN_USE_X86_ASSEMBLER) +#if defined(_WIN32) && defined(UNIV_CAN_USE_X86_ASSEMBLER) && !defined(__NETWARE) mutex_reset_lock_word(mutex); #else os_fast_mutex_init(&(mutex->os_fast_mutex)); diff --git a/isam/test3.c b/isam/test3.c index 7027c56d0f6..228030f5832 100644 --- a/isam/test3.c +++ b/isam/test3.c @@ -16,6 +16,8 @@ /* Test av locking */ +#ifndef __NETWARE__ + #include "nisam.h" #include <sys/types.h> #ifdef HAVE_SYS_WAIT_H @@ -477,3 +479,15 @@ int test_update(N_INFO *file,int id,int lock_type) printf("%2d: update: %5d\n",id,update); fflush(stdout); return 0; } + +#else /* __NETWARE__ */ + +#include <stdio.h> + +main() +{ + fprintf(stderr,"this test has not been ported to NetWare\n"); + return 0; +} + +#endif /* __NETWARE__ */ diff --git a/libmysql/Makefile.shared b/libmysql/Makefile.shared index f7a5a1d97b7..9440d920719 100644 --- a/libmysql/Makefile.shared +++ b/libmysql/Makefile.shared @@ -59,7 +59,7 @@ mysysobjects1 = my_init.lo my_static.lo my_malloc.lo my_realloc.lo \ thr_mutex.lo mulalloc.lo string.lo default.lo \ my_compress.lo array.lo my_once.lo list.lo my_net.lo \ charset.lo hash.lo mf_iocache.lo \ - mf_iocache2.lo my_seek.lo \ + mf_iocache2.lo my_seek.lo my_sleep.lo \ my_pread.lo mf_cache.lo md5.lo sha1.lo\ my_getopt.lo my_gethostbyname.lo my_port.lo sqlobjects = net.lo diff --git a/libmysql/get_password.c b/libmysql/get_password.c index 124c315a821..53eeb1080ce 100644 --- a/libmysql/get_password.c +++ b/libmysql/get_password.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -34,7 +34,7 @@ #include <pwd.h> #endif /* HAVE_PWD_H */ #else /* ! HAVE_GETPASS */ -#if !defined( __WIN__) && !defined(OS2) +#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) #include <sys/ioctl.h> #ifdef HAVE_TERMIOS_H /* For tty-password */ #include <termios.h> @@ -53,7 +53,9 @@ #include <asm/termiobits.h> #endif #else +#ifndef __NETWARE__ #include <conio.h> +#endif /* __NETWARE__ */ #endif /* __WIN__ */ #endif /* HAVE_GETPASS */ @@ -61,9 +63,16 @@ #define getpass(A) getpassphrase(A) #endif -#if defined( __WIN__) || defined(OS2) +#if defined( __WIN__) || defined(OS2) || defined(__NETWARE__) /* were just going to fake it here and get input from the keyboard */ +#ifdef __NETWARE__ +#undef _getch +#undef _cputs +#define _getch getcharacter +#define _cputs(A) putstring(A) +#endif + char *get_tty_password(char *opt_message) { char to[80]; @@ -100,12 +109,11 @@ char *get_tty_password(char *opt_message) #else - #ifndef HAVE_GETPASS /* -** Can't use fgets, because readline will get confused -** length is max number of chars in to, not counting \0 -* to will not include the eol characters. + Can't use fgets, because readline will get confused + length is max number of chars in to, not counting \0 + to will not include the eol characters. */ static void get_password(char *to,uint length,int fd,bool echo) diff --git a/libmysql/libmysql.c b/libmysql/libmysql.c index d9dde0689d0..568fcff9883 100644 --- a/libmysql/libmysql.c +++ b/libmysql/libmysql.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -77,7 +77,7 @@ ulong net_write_timeout= NET_WRITE_TIMEOUT; #endif #if defined(MSDOS) || defined(__WIN__) -// socket_errno is defined in my_global.h for all platforms +/* socket_errno is defined in my_global.h for all platforms */ #define perror(A) #else #include <errno.h> @@ -101,7 +101,6 @@ TYPELIB sql_protocol_typelib = {array_elements(sql_protocol_names_lib)-1,"", #define protocol_41(A) ((A)->server_capabilities & CLIENT_PROTOCOL_41) #define unsigned_field(A) ((A)->flags & UNSIGNED_FLAG) -static void mysql_once_init(void); static MYSQL_DATA *read_rows (MYSQL *mysql,MYSQL_FIELD *fields, uint field_count); static int read_one_row(MYSQL *mysql,uint fields,MYSQL_ROW row, @@ -122,6 +121,7 @@ int STDCALL mysql_server_init(int argc __attribute__((unused)), char **argv __attribute__((unused)), char **groups __attribute__((unused))) { + mysql_once_init(); return 0; } @@ -130,6 +130,8 @@ void STDCALL mysql_server_end() /* If library called my_init(), free memory allocated by it */ if (!org_my_init_done) my_end(0); + else + mysql_thread_end(); } my_bool STDCALL mysql_thread_init() @@ -181,7 +183,7 @@ static MYSQL* spawn_init(MYSQL* parent, const char* host, my_bool my_connect(my_socket s, const struct sockaddr *name, uint namelen, uint timeout) { -#if defined(__WIN__) || defined(OS2) +#if defined(__WIN__) || defined(OS2) || defined(__NETWARE__) return connect(s, (struct sockaddr*) name, namelen) != 0; #else int flags, res, s_err; @@ -694,6 +696,12 @@ advanced_command(MYSQL *mysql, enum enum_server_command command, { DBUG_PRINT("error",("Can't send command to server. Error: %d", socket_errno)); + if (net->last_errno == ER_NET_PACKET_TOO_LARGE) + { + net->last_errno=CR_NET_PACKET_TOO_LARGE; + strmov(net->last_error,ER(net->last_errno)); + goto end; + } end_server(mysql); if (mysql_reconnect(mysql)) goto end; @@ -740,7 +748,16 @@ struct passwd *getpwuid(uid_t); char* getlogin(void); #endif -#if !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__) && !defined(OS2) + +#if defined(__NETWARE__) +/* default to "root" on NetWare */ +static void read_user_name(char *name) +{ + (void)strmake(name,"root", USERNAME_LENGTH); +} + +#elif !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__) && !defined(OS2) + static void read_user_name(char *name) { DBUG_ENTER("read_user_name"); @@ -1706,7 +1723,20 @@ mysql_init(MYSQL *mysql) } -static void mysql_once_init() +/* + Initialize the MySQL library + + SYNOPSIS + mysql_once_init() + + NOTES + Can't be static on NetWare + This function is called by mysql_init() and indirectly called + by mysql_query(), so one should never have to call this from an + outside program. +*/ + +void STDCALL mysql_once_init(void) { if (!mysql_client_init) { diff --git a/libmysql/manager.c b/libmysql/manager.c index 6d977e7eef2..1354b98d1c9 100644 --- a/libmysql/manager.c +++ b/libmysql/manager.c @@ -34,6 +34,10 @@ #if defined(OS2) # include <sys/un.h> +#elif defined(__NETWARE__) +#include <netdb.h> +#include <sys/select.h> +#include <sys/utsname.h> #elif !defined( __WIN__) #include <sys/resource.h> #ifdef HAVE_SYS_UN_H diff --git a/libmysqld/libmysqld.c b/libmysqld/libmysqld.c index 6f7a7e4b666..10d94b09756 100644 --- a/libmysqld/libmysqld.c +++ b/libmysqld/libmysqld.c @@ -66,7 +66,7 @@ TYPELIB sql_protocol_typelib = {array_elements(sql_protocol_names_lib)-1,"", #define closesocket(A) close(A) #endif -static void mysql_once_init(void); +void STDCALL mysql_once_init(void); static void end_server(MYSQL *mysql); static void append_wild(char *to,char *end,const char *wild); static ulong mysql_sub_escape_string(CHARSET_INFO *charset_info, char *to, @@ -3013,7 +3013,7 @@ hardcode_libdir_flag_spec=$hardcode_libdir_flag_spec # the DEB_BUILD_ARCH variable should be of non-zero length, indicating # that we are in the middle of a Debian package build (assuming the # user isn't doing anything strange with environment variables). -if test -n "`dpkg-architecture -qDEB_BUILD_ARCH`" && ps | grep debuild | grep -v grep > /dev/null; then +if test -n "`dpkg-architecture -qDEB_BUILD_ARCH 2>/dev/null`" && ps | grep debuild | grep -v grep > /dev/null; then # Debian policy mandates that rpaths should not be encoded into a binary # so it is overridden. hardcode_libdir_flag_spec=" -D_DEBIAN_PATCHED_LIBTOOL_ " diff --git a/myisam/ft_static.c b/myisam/ft_static.c index b714a7f0c35..44e80847fd7 100644 --- a/myisam/ft_static.c +++ b/myisam/ft_static.c @@ -63,6 +63,7 @@ FT_INFO *ft_init_search(uint mode, void *info, uint keynr, query, query_len, presort); } +const char *ft_stopword_file = 0; const char *ft_precompiled_stopwords[] = { #ifdef COMPILE_STOPWORDS_IN diff --git a/myisam/mi_cache.c b/myisam/mi_cache.c index 462e48b3532..8dee068c50e 100644 --- a/myisam/mi_cache.c +++ b/myisam/mi_cache.c @@ -29,7 +29,8 @@ Allows "partial read" errors in the record header (when READING_HEADER flag is set) - unread part is bzero'ed - Note: out-of-cache reads are disabled for shared IO_CACHE's + Note: out-of-cache reads are enabled for shared IO_CACHE's too, + as these reads will be cached by OS cache (and my_pread is always atomic) */ @@ -43,7 +44,7 @@ int _mi_read_cache(IO_CACHE *info, byte *buff, my_off_t pos, uint length, char *in_buff_pos; DBUG_ENTER("_mi_read_cache"); - if (pos < info->pos_in_file && ! info->share) + if (pos < info->pos_in_file) { read_length=length; if ((my_off_t) read_length > (my_off_t) (info->pos_in_file-pos)) @@ -70,7 +71,7 @@ int _mi_read_cache(IO_CACHE *info, byte *buff, my_off_t pos, uint length, } else in_buff_length=0; - if (flag & READING_NEXT || info->share) + if (flag & READING_NEXT) { if (pos != (info->pos_in_file + (uint) (info->read_end - info->request_pos))) diff --git a/myisam/mi_check.c b/myisam/mi_check.c index abd6cdde657..d3000f63126 100644 --- a/myisam/mi_check.c +++ b/myisam/mi_check.c @@ -905,7 +905,7 @@ int chk_data_link(MI_CHECK *param, MI_INFO *info,int extend) goto err; start_recpos=pos; splits++; - VOID(_mi_pack_get_block_info(info,&block_info, -1, start_recpos, NullS)); + VOID(_mi_pack_get_block_info(info,&block_info, -1, start_recpos)); pos=block_info.filepos+block_info.rec_len; if (block_info.rec_len < (uint) info->s->min_pack_length || block_info.rec_len > (uint) info->s->max_pack_length) @@ -2115,7 +2115,7 @@ int mi_repair_parallel(MI_CHECK *param, register MI_INFO *info, const char * name, int rep_quick) { int got_error; - uint i,key, total_key_length; + uint i,key, total_key_length, istep; ulong rec_length; ha_rows start_records; my_off_t new_header_length,del; @@ -2250,8 +2250,8 @@ int mi_repair_parallel(MI_CHECK *param, register MI_INFO *info, info->state->records=info->state->del=share->state.split=0; info->state->empty=0; - for (i=key=0 ; key < share->base.keys ; - rec_per_key_part+=sort_param[i].keyinfo->keysegs, i++, key++) + for (i=key=0, istep=1 ; key < share->base.keys ; + rec_per_key_part+=sort_param[i].keyinfo->keysegs, i+=istep, key++) { sort_param[i].key=key; sort_param[i].keyinfo=share->keyinfo+key; @@ -2262,9 +2262,10 @@ int mi_repair_parallel(MI_CHECK *param, register MI_INFO *info, (char*) (share->state.rec_per_key_part+ (uint) (rec_per_key_part - param->rec_per_key_part)), sort_param[i].keyinfo->keysegs*sizeof(*rec_per_key_part)); - i--; + istep=0; continue; } + istep=1; if ((!(param->testflag & T_SILENT))) printf ("- Fixing index %d\n",key+1); if (sort_param[i].keyinfo->flag & HA_FULLTEXT) @@ -2887,7 +2888,7 @@ static int sort_get_next_record(MI_SORT_PARAM *sort_param) DBUG_RETURN(1); /* Something wrong with data */ } sort_param->start_recpos=sort_param->pos; - if (_mi_pack_get_block_info(info,&block_info,-1,sort_param->pos, NullS)) + if (_mi_pack_get_block_info(info,&block_info,-1,sort_param->pos)) DBUG_RETURN(-1); if (!block_info.rec_len && sort_param->pos + MEMMAP_EXTRA_MARGIN == diff --git a/myisam/mi_open.c b/myisam/mi_open.c index 4eb7376cdb6..406facec164 100644 --- a/myisam/mi_open.c +++ b/myisam/mi_open.c @@ -116,7 +116,7 @@ MI_INFO *mi_open(const char *name, int mode, uint open_flags) DBUG_PRINT("error",("Wrong header in %s",name_buff)); DBUG_DUMP("error_dump",(char*) share->state.header.file_version, head_length); - my_errno=HA_ERR_WRONG_TABLE_DEF; + my_errno=HA_ERR_NOT_A_TABLE; goto err; } share->options= mi_uint2korr(share->state.header.options); diff --git a/myisam/mi_packrec.c b/myisam/mi_packrec.c index 818788a5e74..66cfd169026 100644 --- a/myisam/mi_packrec.c +++ b/myisam/mi_packrec.c @@ -416,8 +416,7 @@ int _mi_read_pack_record(MI_INFO *info, my_off_t filepos, byte *buf) DBUG_RETURN(-1); /* _search() didn't find record */ file=info->dfile; - if (_mi_pack_get_block_info(info, &block_info, file, filepos, - info->rec_buff)) + if (_mi_pack_get_block_info(info, &block_info, file, filepos)) goto err; if (my_read(file,(byte*) info->rec_buff + block_info.offset , block_info.rec_len - block_info.offset, MYF(MY_NABP))) @@ -963,11 +962,10 @@ int _mi_read_rnd_pack_record(MI_INFO *info, byte *buf, if (_mi_read_cache(&info->rec_cache,(byte*) block_info.header,filepos, share->pack.ref_length, skip_deleted_blocks)) goto err; - b_type=_mi_pack_get_block_info(info,&block_info,-1, filepos, NullS); + b_type=_mi_pack_get_block_info(info,&block_info,-1, filepos); } else - b_type=_mi_pack_get_block_info(info,&block_info,info->dfile,filepos, - info->rec_buff); + b_type=_mi_pack_get_block_info(info,&block_info,info->dfile,filepos); if (b_type) goto err; /* Error code is already set */ #ifndef DBUG_OFF @@ -1007,7 +1005,7 @@ int _mi_read_rnd_pack_record(MI_INFO *info, byte *buf, /* Read and process header from a huff-record-file */ uint _mi_pack_get_block_info(MI_INFO *myisam, MI_BLOCK_INFO *info, File file, - my_off_t filepos, char *rec_buff) + my_off_t filepos) { uchar *header=info->header; uint head_length,ref_length; @@ -1067,7 +1065,7 @@ uint _mi_pack_get_block_info(MI_INFO *myisam, MI_BLOCK_INFO *info, File file, if (file > 0) { info->offset=min(info->rec_len, ref_length - head_length); - memcpy(rec_buff, header+head_length, info->offset); + memcpy(myisam->rec_buff, header+head_length, info->offset); } return 0; } diff --git a/myisam/mi_test3.c b/myisam/mi_test3.c index c2cee12978e..defe041a99f 100644 --- a/myisam/mi_test3.c +++ b/myisam/mi_test3.c @@ -16,6 +16,8 @@ /* Test av locking */ +#ifndef __NETWARE__ + #include "myisam.h" #include <sys/types.h> #ifdef HAVE_SYS_WAIT_H @@ -485,3 +487,15 @@ int test_update(MI_INFO *file,int id,int lock_type) printf("%2d: update: %5d\n",id,update); fflush(stdout); return 0; } + +#else /* __NETWARE__ */ + +#include <stdio.h> + +main() +{ + fprintf(stderr,"this test has not been ported to NetWare\n"); + return 0; +} + +#endif /* __NETWARE__ */ diff --git a/myisam/myisamchk.c b/myisam/myisamchk.c index bbeef27d81b..0a5aa889a1a 100644 --- a/myisam/myisamchk.c +++ b/myisam/myisamchk.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -750,7 +750,7 @@ static int myisamchk(MI_CHECK *param, my_string filename) case HA_ERR_CRASHED: mi_check_print_error(param,"'%s' doesn't have a correct index definition. You need to recreate it before you can do a repair",filename); break; - case HA_ERR_WRONG_TABLE_DEF: + case HA_ERR_NOT_A_TABLE: mi_check_print_error(param,"'%s' is not a MyISAM-table",filename); break; case HA_ERR_CRASHED_ON_USAGE: @@ -875,7 +875,7 @@ static int myisamchk(MI_CHECK *param, my_string filename) else { if (share->state.header.fulltext_keys) - ft_init_stopwords(ft_precompiled_stopwords); + ft_init_stopwords(); if (!(param->testflag & T_READONLY)) lock_type = F_WRLCK; /* table is changed */ diff --git a/myisam/myisamdef.h b/myisam/myisamdef.h index e9485048959..ad07da12c12 100644 --- a/myisam/myisamdef.h +++ b/myisam/myisamdef.h @@ -641,8 +641,7 @@ extern "C" { extern uint _mi_get_block_info(MI_BLOCK_INFO *,File, my_off_t); extern uint _mi_rec_pack(MI_INFO *info,byte *to,const byte *from); -extern uint _mi_pack_get_block_info(MI_INFO *mysql, MI_BLOCK_INFO *, File, - my_off_t, char *rec_buf); +extern uint _mi_pack_get_block_info(MI_INFO *, MI_BLOCK_INFO *, File, my_off_t); extern void _my_store_blob_length(byte *pos,uint pack_length,uint length); extern void _myisam_log(enum myisam_log_commands command,MI_INFO *info, const byte *buffert,uint length); diff --git a/myisammrg/myrg_open.c b/myisammrg/myrg_open.c index f996277d287..7ff00270c68 100644 --- a/myisammrg/myrg_open.c +++ b/myisammrg/myrg_open.c @@ -84,7 +84,7 @@ MYRG_INFO *myrg_open(const char *name, int mode, int handle_locking) last_isam=isam; if (info.reclength && info.reclength != isam->s->base.reclength) { - my_errno=HA_ERR_WRONG_IN_RECORD; + my_errno=HA_ERR_WRONG_MRG_TABLE_DEF; goto err; } info.reclength=isam->s->base.reclength; diff --git a/mysql-test/include/have_crypt.inc b/mysql-test/include/have_crypt.inc new file mode 100644 index 00000000000..fe1f974bffd --- /dev/null +++ b/mysql-test/include/have_crypt.inc @@ -0,0 +1,4 @@ +-- require r/have_crypt.require +disable_query_log; +show variables like "have_crypt"; +enable_query_log; diff --git a/mysql-test/mysql-test-run.sh b/mysql-test/mysql-test-run.sh index 1d730e3f7c5..854a4b10b2f 100644 --- a/mysql-test/mysql-test-run.sh +++ b/mysql-test/mysql-test-run.sh @@ -106,6 +106,7 @@ TAIL=tail ECHO=echo # use internal echo if possible EXPR=expr # use internal if possible FIND=find +GREP=grep if test $? != 0; then exit 1; fi PRINTF=printf RM=rm @@ -609,6 +610,30 @@ report_stats () { $ECHO "If you want to report this error, please read first the documentation at" $ECHO "http://www.mysql.com/doc/M/y/MySQL_test_suite.html" fi + + # + # Report if there was any fatal warnings/errors in the log files + # + $RM -f $MY_LOG_DIR/warnings $MY_LOG_DIR/warnings.tmp + # Remove some non fatal warnings from the log files + $SED -e 's!Warning: Table:.* on delete!!g' \ + $MY_LOG_DIR/*.err > $MY_LOG_DIR/warnings.tmp + + found_error=0 + # Find errors + for i in "^Warning:" "^Error:" "^==.* at 0x" + do + if `$GREP "$i" $MY_LOG_DIR/warnings.tmp >> $MY_LOG_DIR/warnings` + then + found_error=1 + fi + done + $RM -f $MY_LOG_DIR/warnings.tmp + if [ $found_error = "1" ] + then + echo "WARNING: Got errors/warnings while running tests. Please examine" + echo "$MY_LOG_DIR/warnings for details." + fi } mysql_install_db () { diff --git a/mysql-test/r/bigint.result b/mysql-test/r/bigint.result index 8bc383c6f4c..2037085dfdb 100644 --- a/mysql-test/r/bigint.result +++ b/mysql-test/r/bigint.result @@ -8,6 +8,9 @@ select 9223372036854775807,-009223372036854775808; select +9999999999999999999,-9999999999999999999; +9999999999999999999 -9999999999999999999 10000000000000000000 -10000000000000000000 +select 9223372036854775808+1; +9223372036854775808+1 +9223372036854775808 create table t1 (a bigint unsigned not null, primary key(a)); insert into t1 values (18446744073709551615), (0xFFFFFFFFFFFFFFFE); select * from t1; @@ -52,3 +55,12 @@ select min(big),max(big),max(big)-1 from t1 group by a; min(big) max(big) max(big)-1 -1 9223372036854775807 9223372036854775806 drop table t1; +create table t1 (id bigint auto_increment primary key, a int) auto_increment=9999999999; +insert into t1 values (null,1); +select * from t1; +id a +9999999999 1 +select * from t1 limit 9999999999; +id a +9999999999 1 +drop table t1; diff --git a/mysql-test/r/binary.result b/mysql-test/r/binary.result index 325accf00e7..4d5eb62cc71 100644 --- a/mysql-test/r/binary.result +++ b/mysql-test/r/binary.result @@ -43,16 +43,31 @@ name select name from t2 where name between 'Ä' and 'Ö'; name drop table t1,t2; -create table t1 (a char(10) not null, b char(10) binary not null,index (a)); +create table t1 (a char(10) not null, b char(10) binary not null,key (a), key(b)); insert into t1 values ("hello ","hello "),("hello2 ","hello2 "); +select * from t1 where a="hello"; +a b +hello hello select * from t1 where a="hello "; a b hello hello -select * from t1 where b="hello "; +select * from t1 ignore index (a) where a="hello "; a b +hello hello select * from t1 where b="hello"; a b hello hello +select * from t1 where b="hello "; +a b +hello hello +select * from t1 ignore index (b) where b="hello "; +a b +alter table t1 modify b tinytext not null, drop key b, add key (b(100)); +select * from t1 where b="hello "; +a b +select * from t1 ignore index (b) where b="hello "; +a b +hello hello drop table t1; create table t1 (b char(8)); insert into t1 values(NULL); diff --git a/mysql-test/r/count_distinct.result b/mysql-test/r/count_distinct.result index 3bff6c6ad88..81976d268ef 100644 --- a/mysql-test/r/count_distinct.result +++ b/mysql-test/r/count_distinct.result @@ -36,6 +36,10 @@ select t2.isbn,city,t1.libname,count(distinct t1.libname) as a from t3 left join isbn city libname a 007 Berkeley Berkeley Public1 2 000 New York New York Public Libra 2 +select t2.isbn,city,t1.libname,count(distinct t1.libname) as a from t3 left join t1 on t3.libname=t1.libname left join t2 on t3.isbn=t2.isbn group by city having count(distinct concat(t1.libname,'a')) > 1; +isbn city libname a +007 Berkeley Berkeley Public1 2 +000 New York New York Public Libra 2 drop table t1, t2, t3; create table t1 (f1 int); insert into t1 values (1); diff --git a/mysql-test/r/fulltext_var.result b/mysql-test/r/fulltext_var.result index eb71e87538d..dda8e332fba 100644 --- a/mysql-test/r/fulltext_var.result +++ b/mysql-test/r/fulltext_var.result @@ -1,6 +1,7 @@ show variables like "ft\_%"; Variable_name Value +ft_boolean_syntax + -><()~*:""&| ft_min_word_len 4 ft_max_word_len 254 ft_max_word_len_for_sort 20 -ft_boolean_syntax + -><()~*:""&| +ft_stopword_file (built-in) diff --git a/mysql-test/r/func_group.result b/mysql-test/r/func_group.result index 409fd110ab9..b13dfa4de7a 100644 --- a/mysql-test/r/func_group.result +++ b/mysql-test/r/func_group.result @@ -151,3 +151,56 @@ sum(num) 45.63 51.80 drop table t1; +create table t1 (a1 int, a2 char(3), key k1(a1), key k2(a2)); +insert into t1 values(10,'aaa'), (10,null), (10,'bbb'), (20,'zzz'); +create table t2(a1 char(3), a2 int, a3 real, key k1(a1), key k2(a2, a1)); +select * from t1; +a1 a2 +10 aaa +10 NULL +10 bbb +20 zzz +select min(a2) from t1; +min(a2) +aaa +select max(t1.a1), max(t2.a2) from t1, t2; +max(t1.a1) max(t2.a2) +NULL NULL +select max(t1.a1) from t1, t2; +max(t1.a1) +NULL +select max(t2.a2), max(t1.a1) from t1, t2; +max(t2.a2) max(t1.a1) +NULL NULL +explain select min(a2) from t1; +Comment +Select tables optimized away +explain select max(t1.a1), max(t2.a2) from t1, t2; +Comment +No matching min/max row +insert into t2 values('AAA', 10, 0.5); +select max(t1.a1), max(t2.a1) from t1, t2 where t2.a2=9; +max(t1.a1) max(t2.a1) +NULL NULL +select max(t2.a1), max(t1.a1) from t1, t2 where t2.a2=9; +max(t2.a1) max(t1.a1) +NULL NULL +select t1.a1, t1.a2, t2.a1, t2.a2 from t1 left outer join t2 on t1.a1=10; +a1 a2 a1 a2 +10 aaa AAA 10 +10 NULL AAA 10 +10 bbb AAA 10 +20 zzz NULL NULL +select max(t1.a2) from t1 left outer join t2 on t1.a1=10; +max(t1.a2) +zzz +select max(t1.a2) from t1 left outer join t2 on t1.a1=10 where t1.a1=20; +max(t1.a2) +zzz +select max(t1.a2) from t1 left outer join t2 on t1.a1=10 where t1.a1=10; +max(t1.a2) +bbb +select max(t2.a1) from t1 left outer join t2 on t1.a2=t2.a1 and 1=0 where t2.a1='AAA'; +max(t2.a1) +NULL +drop table t1,t2; diff --git a/mysql-test/r/func_math.result b/mysql-test/r/func_math.result index 811a16fff6c..d6596e51db4 100644 --- a/mysql-test/r/func_math.result +++ b/mysql-test/r/func_math.result @@ -36,7 +36,7 @@ select rand(999999),rand(); rand(999999) rand() 0.014231365187309 0.028870999839968 select pi(),sin(pi()/2),cos(pi()/2),abs(tan(pi())),cot(1),asin(1),acos(0),atan(1); -PI() sin(pi()/2) cos(pi()/2) abs(tan(pi())) cot(1) asin(1) acos(0) atan(1) +pi() sin(pi()/2) cos(pi()/2) abs(tan(pi())) cot(1) asin(1) acos(0) atan(1) 3.141593 1.000000 0.000000 0.000000 0.64209262 1.570796 1.570796 0.785398 select degrees(pi()),radians(360); degrees(pi()) radians(360) diff --git a/mysql-test/r/grant.result b/mysql-test/r/grant.result index a1a0c91a575..c1dcd5c29e9 100644 --- a/mysql-test/r/grant.result +++ b/mysql-test/r/grant.result @@ -22,6 +22,7 @@ GRANT SELECT ON `mysqltest`.* TO 'mysqltest_1'@'localhost' grant select on mysqltest.* to mysqltest_1@localhost require NONE; show grants for mysqltest_1@localhost; Grants for mysqltest_1@localhost +GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost' GRANT SELECT ON `mysqltest`.* TO 'mysqltest_1'@'localhost' grant USAGE on mysqltest.* to mysqltest_1@localhost require cipher "EDH-RSA-DES-CBC3-SHA" AND SUBJECT "testsubject" ISSUER "MySQL AB"; show grants for mysqltest_1@localhost; @@ -37,24 +38,34 @@ flush privileges; grant CREATE TEMPORARY TABLES, LOCK TABLES on mysqltest.* to mysqltest_1@localhost; show grants for mysqltest_1@localhost; Grants for mysqltest_1@localhost +GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost' GRANT CREATE TEMPORARY TABLES, LOCK TABLES ON `mysqltest`.* TO 'mysqltest_1'@'localhost' flush privileges; show grants for mysqltest_1@localhost; Grants for mysqltest_1@localhost +GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost' GRANT CREATE TEMPORARY TABLES, LOCK TABLES ON `mysqltest`.* TO 'mysqltest_1'@'localhost' revoke CREATE TEMPORARY TABLES on mysqltest.* from mysqltest_1@localhost; show grants for mysqltest_1@localhost; Grants for mysqltest_1@localhost +GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost' GRANT LOCK TABLES ON `mysqltest`.* TO 'mysqltest_1'@'localhost' grant ALL PRIVILEGES on mysqltest.* to mysqltest_1@localhost with GRANT OPTION; flush privileges; show grants for mysqltest_1@localhost; Grants for mysqltest_1@localhost +GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost' GRANT ALL PRIVILEGES ON `mysqltest`.* TO 'mysqltest_1'@'localhost' WITH GRANT OPTION revoke LOCK TABLES, ALTER on mysqltest.* from mysqltest_1@localhost; show grants for mysqltest_1@localhost; Grants for mysqltest_1@localhost +GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost' GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, CREATE TEMPORARY TABLES ON `mysqltest`.* TO 'mysqltest_1'@'localhost' WITH GRANT OPTION revoke all privileges on mysqltest.* from mysqltest_1@localhost; delete from mysql.user where user='mysqltest_1'; flush privileges; +grant usage on test.* to user@localhost with grant option; +show grants for user@localhost; +Grants for user@localhost +GRANT USAGE ON *.* TO 'user'@'localhost' +GRANT USAGE ON `test`.* TO 'user'@'localhost' WITH GRANT OPTION diff --git a/mysql-test/r/group_by.result b/mysql-test/r/group_by.result index a63054da88b..40e2c72ff32 100644 --- a/mysql-test/r/group_by.result +++ b/mysql-test/r/group_by.result @@ -34,6 +34,11 @@ userid MIN(t1.score) 1 1 2 2 3 3 +SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid ORDER BY NULL; +userid MIN(t1.score) +1 1 +2 2 +3 3 SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid; userid MIN(t1.score) 1 1 @@ -42,6 +47,10 @@ SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1 userid MIN(t1.score+0.0) 1 1.0 2 2.0 +SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid ORDER BY NULL; +userid MIN(t1.score+0.0) +1 1.0 +2 2.0 drop table t1,t2; CREATE TABLE t1 ( PID int(10) unsigned DEFAULT '0' NOT NULL auto_increment, @@ -88,6 +97,8 @@ INSERT INTO t2 VALUES (91,2); INSERT INTO t2 VALUES (92,2); SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid; cid CONCAT(firstname, ' ', surname) COUNT(call_id) +SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY NULL; +cid CONCAT(firstname, ' ', surname) COUNT(call_id) SELECT HIGH_PRIORITY cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY surname, firstname; cid CONCAT(firstname, ' ', surname) COUNT(call_id) drop table t1,t2; @@ -237,6 +248,9 @@ INSERT INTO t1 VALUES (1,1,1),(2,2,2),(2,1,1),(3,3,3),(4,3,3),(5,3,3); explain select userid,count(*) from t1 group by userid desc; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort +explain select userid,count(*) from t1 group by userid desc order by null; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using temporary select userid,count(*) from t1 group by userid desc; userid count(*) 3 3 @@ -252,6 +266,9 @@ userid count(*) explain select spid,count(*) from t1 where spid between 1 and 2 group by spid desc; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range spID spID 5 NULL 2 Using where; Using index +explain select spid,count(*) from t1 where spid between 1 and 2 group by spid order by null; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 range spID spID 5 NULL 2 Using where; Using index explain select spid,count(*) from t1 where spid between 1 and 2 group by spid; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range spID spID 5 NULL 2 Using where; Using index @@ -266,6 +283,9 @@ spid count(*) explain select sql_big_result spid,sum(userid) from t1 group by spid desc; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using filesort +explain select sql_big_result spid,sum(userid) from t1 group by spid desc order by null; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 6 select sql_big_result spid,sum(userid) from t1 group by spid desc; spid sum(userid) 5 3 @@ -276,6 +296,9 @@ spid sum(userid) explain select sql_big_result score,count(*) from t1 group by score desc; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL score 3 NULL 6 Using index +explain select sql_big_result score,count(*) from t1 group by score desc order by null; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 index NULL score 3 NULL 6 Using index select sql_big_result score,count(*) from t1 group by score desc; score count(*) 3 3 @@ -482,3 +505,63 @@ NULL 9 3 b 1 drop table t1; +create table t1 (a int not null, b int not null); +insert into t1 values (1,1),(1,2),(3,1),(3,2),(2,2),(2,1); +create table t2 (a int not null, b int not null, key(a)); +insert into t2 values (1,3),(3,1),(2,2),(1,1); +select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b; +a b +1 1 +1 3 +2 2 +3 1 +select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL; +a b +1 3 +3 1 +2 2 +1 1 +explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b; +table type possible_keys key key_len ref rows Extra +t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort +t2 ALL a NULL NULL NULL 4 Using where +explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL; +table type possible_keys key key_len ref rows Extra +t1 ALL NULL NULL NULL NULL 6 Using temporary +t2 ALL a NULL NULL NULL 4 Using where +drop table t1,t2; +create table t1 (a int, b int); +insert into t1 values (1, 4); +insert into t1 values (10, 40); +insert into t1 values (1, 4); +insert into t1 values (10, 43); +insert into t1 values (1, 4); +insert into t1 values (10, 41); +insert into t1 values (1, 4); +insert into t1 values (10, 43); +insert into t1 values (1, 4); +select a, MAX(b), INTERVAL (MAX(b), 1,3,10,30,39,40,50,60,100,1000) from t1 group by a; +a MAX(b) INTERVAL (MAX(b), 1,3,10,30,39,40,50,60,100,1000) +1 4 2 +10 43 6 +select a, MAX(b), CASE MAX(b) when 4 then 4 when 43 then 43 else 0 end from t1 group by a; +a MAX(b) CASE MAX(b) when 4 then 4 when 43 then 43 else 0 end +1 4 4 +10 43 43 +select a, MAX(b), FIELD(MAX(b), '43', '4', '5') from t1 group by a; +a MAX(b) FIELD(MAX(b), '43', '4', '5') +1 4 2 +10 43 1 +select a, MAX(b), CONCAT_WS(MAX(b), '43', '4', '5') from t1 group by a; +a MAX(b) CONCAT_WS(MAX(b), '43', '4', '5') +1 4 434445 +10 43 43434435 +select a, MAX(b), ELT(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f') from t1 group by a; +a MAX(b) ELT(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f') +1 4 d +10 43 NULL +select a, MAX(b), MAKE_SET(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h') from t1 group by a; +a MAX(b) MAKE_SET(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h') +1 4 c +10 43 a,b,d,f +drop table t1; diff --git a/mysql-test/r/handler.result b/mysql-test/r/handler.result index b47f97e167f..9d3383efd8f 100644 --- a/mysql-test/r/handler.result +++ b/mysql-test/r/handler.result @@ -138,4 +138,10 @@ a b handler t2 read last; You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 handler t2 close; -drop table if exists t1; +handler t1 open as t2; +drop table t1; +create table t1 (a int); +insert into t1 values (17); +handler t2 read first; +Unknown table 't2' in HANDLER +drop table t1; diff --git a/mysql-test/r/have_crypt.require b/mysql-test/r/have_crypt.require new file mode 100644 index 00000000000..739fbb738f0 --- /dev/null +++ b/mysql-test/r/have_crypt.require @@ -0,0 +1,2 @@ +Variable_name Value +have_crypt YES diff --git a/mysql-test/r/query_cache.result b/mysql-test/r/query_cache.result index 17c9c8edbd2..7114c251e03 100644 --- a/mysql-test/r/query_cache.result +++ b/mysql-test/r/query_cache.result @@ -544,3 +544,14 @@ select * from mysql.db; show status like "Qcache_queries_in_cache"; Variable_name Value Qcache_queries_in_cache 0 +create table t1(id int auto_increment primary key); +insert into t1 values (NULL), (NULL), (NULL); +select * from t1 where id=2; +id +2 +alter table t1 rename to t2; +select * from t1 where id=2; +Table 'test.t1' doesn't exist +drop table t2; +select * from t1 where id=2; +Table 'test.t1' doesn't exist diff --git a/mysql-test/r/rpl000009.result b/mysql-test/r/rpl000009.result index e67993b53f6..fef2b8c6179 100644 --- a/mysql-test/r/rpl000009.result +++ b/mysql-test/r/rpl000009.result @@ -8,6 +8,7 @@ drop database if exists mysqltest2; create database mysqltest2; drop database if exists mysqltest; create database mysqltest; +create database mysqltest2; create table mysqltest2.foo (n int); insert into mysqltest2.foo values(4); create table mysqltest2.foo (n int); diff --git a/mysql-test/r/rpl_insert_id.result b/mysql-test/r/rpl_insert_id.result new file mode 100644 index 00000000000..d524818985e --- /dev/null +++ b/mysql-test/r/rpl_insert_id.result @@ -0,0 +1,41 @@ +slave stop; +drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9; +reset master; +reset slave; +drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9; +slave start; +drop table if exists t1; +create table t1(a int auto_increment, key(a)); +create table t2(b int auto_increment, c int, key(b)); +insert into t1 values (1),(2),(3); +insert into t1 values (null); +insert into t2 values (null,last_insert_id()); +select * from t1; +a +1 +2 +3 +4 +select * from t2; +b c +1 4 +drop table t1; +drop table t2; +create table t1(a int auto_increment, key(a)); +create table t2(b int auto_increment, c int, key(b)); +insert into t1 values (10); +insert into t1 values (null),(null),(null); +insert into t2 values (5,0); +insert into t2 values (null,last_insert_id()); +select * from t1; +a +10 +11 +12 +13 +select * from t2; +b c +5 0 +6 11 +drop table t1; +drop table t2; diff --git a/mysql-test/r/rpl_master_pos_wait.result b/mysql-test/r/rpl_master_pos_wait.result new file mode 100644 index 00000000000..22c7aef621c --- /dev/null +++ b/mysql-test/r/rpl_master_pos_wait.result @@ -0,0 +1,9 @@ +slave stop; +drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9; +reset master; +reset slave; +drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9; +slave start; +select master_pos_wait('master-bin.999999',0,10); +master_pos_wait('master-bin.999999',0,10) +-1 diff --git a/mysql-test/r/select_found.result b/mysql-test/r/select_found.result index 5b6c490b928..c8991696b5e 100644 --- a/mysql-test/r/select_found.result +++ b/mysql-test/r/select_found.result @@ -12,43 +12,43 @@ a b 7 7 8 9 select found_rows(); -FOUND_ROWS() +found_rows() 8 select SQL_CALC_FOUND_ROWS * from t1 limit 1; a b 1 2 select found_rows(); -FOUND_ROWS() +found_rows() 8 select SQL_BUFFER_RESULT SQL_CALC_FOUND_ROWS * from t1 limit 1; a b 1 2 select found_rows(); -FOUND_ROWS() +found_rows() 8 select SQL_CALC_FOUND_ROWS * from t1 order by b desc limit 1; a b 8 9 select found_rows(); -FOUND_ROWS() +found_rows() 8 select SQL_CALC_FOUND_ROWS distinct b from t1 limit 1; b 2 select found_rows(); -FOUND_ROWS() +found_rows() 6 select SQL_CALC_FOUND_ROWS b,count(*) as c from t1 group by b order by c desc limit 1; b c 5 3 select found_rows(); -FOUND_ROWS() +found_rows() 6 select SQL_CALC_FOUND_ROWS * from t1 left join t1 as t2 on (t1.b=t2.a) limit 2,1; a b a b 3 5 5 5 select found_rows(); -FOUND_ROWS() +found_rows() 8 drop table t1; create table t1 (a int not null primary key); diff --git a/mysql-test/r/union.result b/mysql-test/r/union.result index e546a8c8284..cb3a8029a87 100644 --- a/mysql-test/r/union.result +++ b/mysql-test/r/union.result @@ -91,7 +91,7 @@ id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 4 2 UNION t2 ALL NULL NULL NULL NULL 4 Using filesort select found_rows(); -FOUND_ROWS() +found_rows() 0 explain select a,b from t1 union all select a,b from t2; id select_type table type possible_keys key key_len ref rows Extra diff --git a/mysql-test/t/backup.test b/mysql-test/t/backup.test index 8939d281eda..02ef72ef66d 100644 --- a/mysql-test/t/backup.test +++ b/mysql-test/t/backup.test @@ -6,7 +6,7 @@ set SQL_LOG_BIN=0; drop table if exists t1, t2, t3; --enable_warnings create table t1(n int); ---replace_result "errno = 2" "errno = X" "errno = 22" "errno = X" "errno = 23" "errno = X" +--replace_result "errno = 1" "errno = X" "errno = 2" "errno = X" "errno = 22" "errno = X" "errno = 23" "errno = X" backup table t1 to '../bogus'; backup table t1 to '../tmp'; drop table t1; diff --git a/mysql-test/t/bigint.test b/mysql-test/t/bigint.test index 3dde4b8a2c1..f627614c049 100644 --- a/mysql-test/t/bigint.test +++ b/mysql-test/t/bigint.test @@ -11,7 +11,7 @@ drop table if exists t1; select 0,256,00000000000000065536,2147483647,-2147483648,2147483648,+4294967296; select 9223372036854775807,-009223372036854775808; select +9999999999999999999,-9999999999999999999; - +select 9223372036854775808+1; # # In 3.23 we have to disable the test of column to bigint as # this fails on AIX powerpc (the resolution for double is not good enough) @@ -41,3 +41,13 @@ alter table t1 modify big bigint not null; select min(big),max(big),max(big)-1 from t1; select min(big),max(big),max(big)-1 from t1 group by a; drop table t1; + +# +# Test problem with big values fir auto_increment +# + +create table t1 (id bigint auto_increment primary key, a int) auto_increment=9999999999; +insert into t1 values (null,1); +select * from t1; +select * from t1 limit 9999999999; +drop table t1; diff --git a/mysql-test/t/binary.test b/mysql-test/t/binary.test index 0a5dd71f98e..4f9ac7581d2 100644 --- a/mysql-test/t/binary.test +++ b/mysql-test/t/binary.test @@ -28,11 +28,18 @@ drop table t1,t2; # Test of binary and normal strings # -create table t1 (a char(10) not null, b char(10) binary not null,index (a)); +create table t1 (a char(10) not null, b char(10) binary not null,key (a), key(b)); insert into t1 values ("hello ","hello "),("hello2 ","hello2 "); +select * from t1 where a="hello"; select * from t1 where a="hello "; -select * from t1 where b="hello "; +select * from t1 ignore index (a) where a="hello "; select * from t1 where b="hello"; +select * from t1 where b="hello "; +select * from t1 ignore index (b) where b="hello "; +# blob test +alter table t1 modify b tinytext not null, drop key b, add key (b(100)); +select * from t1 where b="hello "; +select * from t1 ignore index (b) where b="hello "; drop table t1; # diff --git a/mysql-test/t/count_distinct.test b/mysql-test/t/count_distinct.test index c7740e73ee8..239edea2422 100644 --- a/mysql-test/t/count_distinct.test +++ b/mysql-test/t/count_distinct.test @@ -34,6 +34,7 @@ insert into t1 values ('Berkeley Public2','Berkeley'); insert into t1 values ('NYC Lib','New York'); select t2.isbn,city,t1.libname,count(t1.libname) as a from t3 left join t1 on t3.libname=t1.libname left join t2 on t3.isbn=t2.isbn group by city,t1.libname; select t2.isbn,city,t1.libname,count(distinct t1.libname) as a from t3 left join t1 on t3.libname=t1.libname left join t2 on t3.isbn=t2.isbn group by city having count(distinct t1.libname) > 1; +select t2.isbn,city,t1.libname,count(distinct t1.libname) as a from t3 left join t1 on t3.libname=t1.libname left join t2 on t3.isbn=t2.isbn group by city having count(distinct concat(t1.libname,'a')) > 1; drop table t1, t2, t3; # diff --git a/mysql-test/t/func_crypt.test b/mysql-test/t/func_crypt.test index af0ef661d06..c72356bda1a 100644 --- a/mysql-test/t/func_crypt.test +++ b/mysql-test/t/func_crypt.test @@ -1,3 +1,5 @@ +-- source include/have_crypt.inc + select length(encrypt('foo', 'ff')) <> 0; --replace_result $1$aa$4OSUA5cjdx0RUQ08opV27/ aaqPiZY5xR5l. diff --git a/mysql-test/t/func_group.test b/mysql-test/t/func_group.test index b6511779f51..fe1cebaac17 100644 --- a/mysql-test/t/func_group.test +++ b/mysql-test/t/func_group.test @@ -102,3 +102,30 @@ insert into t1 values (5.2,'nem'),(8.64,'monty'),(11.12,'sinisa'); select sum(num) from t1; select sum(num) from t1 group by user; drop table t1; + +# +# Test problem with MIN() optimization in case of null values +# + +create table t1 (a1 int, a2 char(3), key k1(a1), key k2(a2)); +insert into t1 values(10,'aaa'), (10,null), (10,'bbb'), (20,'zzz'); +create table t2(a1 char(3), a2 int, a3 real, key k1(a1), key k2(a2, a1)); +select * from t1; +# The following returned NULL in 4.0.10 +select min(a2) from t1; +select max(t1.a1), max(t2.a2) from t1, t2; +select max(t1.a1) from t1, t2; +select max(t2.a2), max(t1.a1) from t1, t2; + +explain select min(a2) from t1; +explain select max(t1.a1), max(t2.a2) from t1, t2; + +insert into t2 values('AAA', 10, 0.5); +select max(t1.a1), max(t2.a1) from t1, t2 where t2.a2=9; +select max(t2.a1), max(t1.a1) from t1, t2 where t2.a2=9; +select t1.a1, t1.a2, t2.a1, t2.a2 from t1 left outer join t2 on t1.a1=10; +select max(t1.a2) from t1 left outer join t2 on t1.a1=10; +select max(t1.a2) from t1 left outer join t2 on t1.a1=10 where t1.a1=20; +select max(t1.a2) from t1 left outer join t2 on t1.a1=10 where t1.a1=10; +select max(t2.a1) from t1 left outer join t2 on t1.a2=t2.a1 and 1=0 where t2.a1='AAA'; +drop table t1,t2; diff --git a/mysql-test/t/grant.test b/mysql-test/t/grant.test index 7ee3b08cc3b..bd04b2e4c41 100644 --- a/mysql-test/t/grant.test +++ b/mysql-test/t/grant.test @@ -39,3 +39,6 @@ show grants for mysqltest_1@localhost; revoke all privileges on mysqltest.* from mysqltest_1@localhost; delete from mysql.user where user='mysqltest_1'; flush privileges; +grant usage on test.* to user@localhost with grant option; +show grants for user@localhost; + diff --git a/mysql-test/t/grant_cache.test b/mysql-test/t/grant_cache.test index 84091d9b830..2d704a770aa 100644 --- a/mysql-test/t/grant_cache.test +++ b/mysql-test/t/grant_cache.test @@ -9,7 +9,7 @@ drop table if exists test.t1,mysqltest.t1,mysqltest.t2; reset query cache; flush status; -connect (root,localhost,root,,test,0,master.sock); +connect (root,localhost,root,,test,$MASTER_MYPORT,master.sock); connection root; --disable_warnings create database if not exists mysqltest; @@ -22,7 +22,7 @@ insert into mysqltest.t2 values (3,3,3); create table test.t1 (a char (10)); insert into test.t1 values ("test.t1"); select * from t1; -connect (root2,localhost,root,,mysqltest,0,master.sock); +connect (root2,localhost,root,,mysqltest,$MASTER_MYPORT,master.sock); connection root2; # put queries in cache select * from t1; @@ -40,7 +40,7 @@ grant SELECT on test.t1 to mysqltest_2@localhost; grant SELECT(a) on mysqltest.t1 to mysqltest_3@localhost; # The following queries should be fetched from cache -connect (user1,localhost,mysqltest_1,,mysqltest,0,master.sock); +connect (user1,localhost,mysqltest_1,,mysqltest,$MASTER_MYPORT,master.sock); connection user1; select "user1"; select * from t1; @@ -52,13 +52,14 @@ show status like "Qcache_hits"; show status like "Qcache_not_cached"; # The following queries should be fetched from cache -connect (user2,localhost,mysqltest_2,,mysqltest,0,master.sock); +connect (user2,localhost,mysqltest_2,,mysqltest,$MASTER_MYPORT,master.sock); connection user2; select "user2"; select * from t1; select a from t1; select c from t1; select * from mysqltest.t1,test.t1; +--replace_result 127.0.0.1 localhost --error 1142 select * from t2; show status like "Qcache_queries_in_cache"; @@ -66,16 +67,20 @@ show status like "Qcache_hits"; show status like "Qcache_not_cached"; # The following queries should not be fetched from cache -connect (user3,localhost,mysqltest_3,,mysqltest,0,master.sock); +connect (user3,localhost,mysqltest_3,,mysqltest,$MASTER_MYPORT,master.sock); connection user3; select "user3"; +--replace_result 127.0.0.1 localhost --error 1143 select * from t1; select a from t1; +--replace_result 127.0.0.1 localhost --error 1143 select c from t1; +--replace_result 127.0.0.1 localhost --error 1142 select * from t2; +--replace_result 127.0.0.1 localhost --error 1143 select mysqltest.t1.c from test.t1,mysqltest.t1; show status like "Qcache_queries_in_cache"; @@ -83,7 +88,7 @@ show status like "Qcache_hits"; show status like "Qcache_not_cached"; # Connect without a database -connect (user4,localhost,mysqltest_1,,*NO-ONE*,0,master.sock); +connect (user4,localhost,mysqltest_1,,*NO-ONE*,$MASTER_MYPORT,master.sock); connection user4; select "user4"; --error 1046 diff --git a/mysql-test/t/group_by.test b/mysql-test/t/group_by.test index bca86f1ef37..dfcf72eb2c3 100644 --- a/mysql-test/t/group_by.test +++ b/mysql-test/t/group_by.test @@ -46,8 +46,10 @@ INSERT INTO t2 VALUES (2,'name','pass','mail','Y','v','n','adr','1','1','1'); INSERT INTO t2 VALUES (3,'name','pass','mail','Y','v','n','adr','1','1','1'); SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid; +SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid ORDER BY NULL; SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid; SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid; +SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid ORDER BY NULL; drop table t1,t2; # @@ -110,6 +112,7 @@ INSERT INTO t2 VALUES (91,2); INSERT INTO t2 VALUES (92,2); SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid; +SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY NULL; SELECT HIGH_PRIORITY cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY surname, firstname; drop table t1,t2; @@ -244,16 +247,20 @@ CREATE TABLE t1 ( INSERT INTO t1 VALUES (1,1,1),(2,2,2),(2,1,1),(3,3,3),(4,3,3),(5,3,3); explain select userid,count(*) from t1 group by userid desc; +explain select userid,count(*) from t1 group by userid desc order by null; select userid,count(*) from t1 group by userid desc; select userid,count(*) from t1 group by userid desc having (count(*)+1) IN (4,3); select userid,count(*) from t1 group by userid desc having 3 IN (1,COUNT(*)); explain select spid,count(*) from t1 where spid between 1 and 2 group by spid desc; explain select spid,count(*) from t1 where spid between 1 and 2 group by spid; +explain select spid,count(*) from t1 where spid between 1 and 2 group by spid order by null; select spid,count(*) from t1 where spid between 1 and 2 group by spid; select spid,count(*) from t1 where spid between 1 and 2 group by spid desc; explain select sql_big_result spid,sum(userid) from t1 group by spid desc; +explain select sql_big_result spid,sum(userid) from t1 group by spid desc order by null; select sql_big_result spid,sum(userid) from t1 group by spid desc; explain select sql_big_result score,count(*) from t1 group by score desc; +explain select sql_big_result score,count(*) from t1 group by score desc order by null; select sql_big_result score,count(*) from t1 group by score desc; drop table t1; @@ -374,3 +381,39 @@ select a,count(*) from t1 group by a; set option sql_big_tables=1; select a,count(*) from t1 group by a; drop table t1; + +# +# Test of GROUP BY ... ORDER BY NULL optimization +# + +create table t1 (a int not null, b int not null); +insert into t1 values (1,1),(1,2),(3,1),(3,2),(2,2),(2,1); +create table t2 (a int not null, b int not null, key(a)); +insert into t2 values (1,3),(3,1),(2,2),(1,1); +select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b; +select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL; +explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b; +explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL; +drop table t1,t2; + +# +# group function arguments in some functions +# + +create table t1 (a int, b int); +insert into t1 values (1, 4); +insert into t1 values (10, 40); +insert into t1 values (1, 4); +insert into t1 values (10, 43); +insert into t1 values (1, 4); +insert into t1 values (10, 41); +insert into t1 values (1, 4); +insert into t1 values (10, 43); +insert into t1 values (1, 4); +select a, MAX(b), INTERVAL (MAX(b), 1,3,10,30,39,40,50,60,100,1000) from t1 group by a; +select a, MAX(b), CASE MAX(b) when 4 then 4 when 43 then 43 else 0 end from t1 group by a; +select a, MAX(b), FIELD(MAX(b), '43', '4', '5') from t1 group by a; +select a, MAX(b), CONCAT_WS(MAX(b), '43', '4', '5') from t1 group by a; +select a, MAX(b), ELT(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f') from t1 group by a; +select a, MAX(b), MAKE_SET(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h') from t1 group by a; +drop table t1; diff --git a/mysql-test/t/handler.test b/mysql-test/t/handler.test index b72b739600e..657185f5e2d 100644 --- a/mysql-test/t/handler.test +++ b/mysql-test/t/handler.test @@ -33,13 +33,15 @@ handler t2 read a next; handler t2 read a=(15); handler t2 read a=(16); -!$1070 handler t2 read a=(19,"fff"); +--error 1070 +handler t2 read a=(19,"fff"); handler t2 read b=(19,"fff"); handler t2 read b=(19,"yyy"); handler t2 read b=(19); -!$1109 handler t1 read a last; +--error 1109 +handler t1 read a last; handler t2 read a=(11); handler t2 read a>=(11); @@ -65,8 +67,19 @@ handler t2 read first; handler t2 read next; alter table t1 type=MyISAM; handler t2 read next; -!$1064 handler t2 read last; +--error 1064 +handler t2 read last; handler t2 close; -drop table if exists t1; + +# +# DROP TABLE +# +handler t1 open as t2; +drop table t1; +create table t1 (a int); +insert into t1 values (17); +--error 1109 +handler t2 read first; +drop table t1; diff --git a/mysql-test/t/query_cache.test b/mysql-test/t/query_cache.test index e1df5fa7b3b..5f2cf8b5f56 100644 --- a/mysql-test/t/query_cache.test +++ b/mysql-test/t/query_cache.test @@ -387,3 +387,17 @@ disable_result_log; select * from mysql.db; enable_result_log; show status like "Qcache_queries_in_cache"; + + +# +# simple rename test +# +create table t1(id int auto_increment primary key); +insert into t1 values (NULL), (NULL), (NULL); +select * from t1 where id=2; +alter table t1 rename to t2; +-- error 1146 +select * from t1 where id=2; +drop table t2; +-- error 1146 +select * from t1 where id=2; diff --git a/mysql-test/t/rpl000009.test b/mysql-test/t/rpl000009.test index d5cb14350a6..1fbdd65e1fb 100644 --- a/mysql-test/t/rpl000009.test +++ b/mysql-test/t/rpl000009.test @@ -12,6 +12,7 @@ create database mysqltest; save_master_pos; connection slave; sync_with_master; +create database mysqltest; create table mysqltest2.foo (n int); insert into mysqltest2.foo values(4); connection master; @@ -25,10 +26,13 @@ sync_with_master; select mysqltest2.foo.n,mysqltest.bar.m from mysqltest2.foo,mysqltest.bar; connection master; drop database mysqltest; -drop database mysqltest2; +drop database if exists mysqltest2; save_master_pos; connection slave; sync_with_master; +--error 1008 +drop database mysqltest2; +drop database mysqltest; # Now let's test load data from master diff --git a/mysql-test/t/rpl000015.test b/mysql-test/t/rpl000015.test index 9573dfd8fb3..b5234373355 100644 --- a/mysql-test/t/rpl000015.test +++ b/mysql-test/t/rpl000015.test @@ -1,5 +1,5 @@ -connect (master,localhost,root,,test,0,master.sock); -connect (slave,localhost,root,,test,0, slave.sock); +connect (master,localhost,root,,test,$MASTER_MYPORT,master.sock); +connect (slave,localhost,root,,test,$SLAVE_MYPORT,slave.sock); connection master; reset master; show master status; diff --git a/mysql-test/t/rpl000017.test b/mysql-test/t/rpl000017.test index f38e109cb19..cf808a2cbc0 100644 --- a/mysql-test/t/rpl000017.test +++ b/mysql-test/t/rpl000017.test @@ -1,5 +1,5 @@ -connect (master,localhost,root,,test,0,master.sock); -connect (slave,localhost,root,,test,0,slave.sock); +connect (master,localhost,root,,test,$MASTER_MYPORT,master.sock); +connect (slave,localhost,root,,test,$SLAVE_MYPORT,slave.sock); connection master; reset master; grant replication slave on *.* to replicate@localhost identified by 'aaaaaaaaaaaaaaab'; diff --git a/mysql-test/t/rpl_insert_id.test b/mysql-test/t/rpl_insert_id.test new file mode 100644 index 00000000000..3f3636d3082 --- /dev/null +++ b/mysql-test/t/rpl_insert_id.test @@ -0,0 +1,39 @@ +#see if queries that use both +#auto_increment and LAST_INSERT_ID() +#are replicated well +source include/master-slave.inc; +connection master; +drop table if exists t1; +create table t1(a int auto_increment, key(a)); +create table t2(b int auto_increment, c int, key(b)); +insert into t1 values (1),(2),(3); +insert into t1 values (null); +insert into t2 values (null,last_insert_id()); +save_master_pos; +connection slave; +sync_with_master; +select * from t1; +select * from t2; +connection master; +#check if multi-line inserts, +#which set last_insert_id to the first id inserted, +#are replicated the same way +drop table t1; +drop table t2; +create table t1(a int auto_increment, key(a)); +create table t2(b int auto_increment, c int, key(b)); +insert into t1 values (10); +insert into t1 values (null),(null),(null); +insert into t2 values (5,0); +insert into t2 values (null,last_insert_id()); +save_master_pos; +connection slave; +sync_with_master; +select * from t1; +select * from t2; +connection master; +drop table t1; +drop table t2; +save_master_pos; +connection slave; +sync_with_master; diff --git a/mysql-test/t/rpl_master_pos_wait.test b/mysql-test/t/rpl_master_pos_wait.test new file mode 100644 index 00000000000..a6aae222a89 --- /dev/null +++ b/mysql-test/t/rpl_master_pos_wait.test @@ -0,0 +1,9 @@ +# See if master_pos_wait(,,timeout) +# Terminates with "timeout expired" (-1) +source include/master-slave.inc; +save_master_pos; +connection slave; +sync_with_master; +# Ask for a master log that has certainly not been reached yet +# timeout= 10 seconds +select master_pos_wait('master-bin.999999',0,10); diff --git a/mysql-test/t/rpl_rotate_logs.test b/mysql-test/t/rpl_rotate_logs.test index 025e07382ba..52c7bc290bb 100644 --- a/mysql-test/t/rpl_rotate_logs.test +++ b/mysql-test/t/rpl_rotate_logs.test @@ -9,11 +9,11 @@ # changes # - Test creating a duplicate key error and recover from it -connect (master,localhost,root,,test,0,master.sock); +connect (master,localhost,root,,test,$MASTER_MYPORT,master.sock); --disable_warnings drop table if exists t1, t2, t3, t4; --enable_warnings -connect (slave,localhost,root,,test,0,slave.sock); +connect (slave,localhost,root,,test,$SLAVE_MYPORT,slave.sock); system cat /dev/null > var/slave-data/master.info; system chmod 000 var/slave-data/master.info; connection slave; diff --git a/mysys/Makefile.am b/mysys/Makefile.am index 97eb06c7aa7..5b1c859cb2a 100644 --- a/mysys/Makefile.am +++ b/mysys/Makefile.am @@ -49,10 +49,10 @@ libmysys_a_SOURCES = my_init.c my_getwd.c mf_getdate.c\ my_quick.c my_lockmem.c my_static.c \ my_getopt.c my_mkdir.c \ default.c my_compress.c checksum.c raid.cc \ - my_net.c my_semaphore.c my_port.c \ + my_net.c my_semaphore.c my_port.c my_sleep.c \ charset.c my_bitmap.c my_bit.c md5.c \ my_gethostbyname.c rijndael.c my_aes.c sha1.c \ - my_handler.c + my_handler.c my_netware.c EXTRA_DIST = thr_alarm.c thr_lock.c my_pthread.c my_thr_init.c \ thr_mutex.c thr_rwlock.c libmysys_a_LIBADD = @THREAD_LOBJECTS@ @@ -78,38 +78,36 @@ FLAGS=$(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) @NOINST_LDFLAGS@ # which automaticly removes the object files you use to compile a final program # -test_thr_alarm: thr_alarm.c $(LIBRARIES) +test_thr_alarm$(EXEEXT): thr_alarm.c $(LIBRARIES) $(CP) $(srcdir)/thr_alarm.c ./test_thr_alarm.c $(LINK) $(FLAGS) -DMAIN ./test_thr_alarm.c $(LDADD) $(LIBS) - $(RM) -f ./test_thr_alarm.* + $(RM) -f ./test_thr_alarm.c -test_thr_lock: thr_lock.c $(LIBRARIES) +test_thr_lock$(EXEEXT): thr_lock.c $(LIBRARIES) $(CP) $(srcdir)/thr_lock.c test_thr_lock.c $(LINK) $(FLAGS) -DMAIN ./test_thr_lock.c $(LDADD) $(LIBS) - $(RM) -f ./test_thr_lock.* + $(RM) -f ./test_thr_lock.c -test_vsnprintf: my_vsnprintf.c $(LIBRARIES) +test_vsnprintf$(EXEEXT): my_vsnprintf.c $(LIBRARIES) $(CP) $(srcdir)/my_vsnprintf.c test_vsnprintf.c $(LINK) $(FLAGS) -DMAIN ./test_vsnprintf.c $(LDADD) $(LIBS) - $(RM) -f test_vsnprintf.* -test_io_cache: mf_iocache.c $(LIBRARIES) + $(RM) -f test_vsnprintf.c + +test_io_cache$(EXEEXT): mf_iocache.c $(LIBRARIES) $(CP) $(srcdir)/mf_iocache.c test_io_cache.c $(LINK) $(FLAGS) -DMAIN ./test_io_cache.c $(LDADD) $(LIBS) - $(RM) -f test_io_cache.* + $(RM) -f test_io_cache.c -test_dir: test_dir.c $(LIBRARIES) +test_dir$(EXEEXT): test_dir.c $(LIBRARIES) $(LINK) $(FLAGS) -DMAIN $(srcdir)/test_dir.c $(LDADD) $(LIBS) test_charset$(EXEEXT): test_charset.c $(LIBRARIES) $(LINK) $(FLAGS) -DMAIN $(srcdir)/test_charset.c $(LDADD) $(LIBS) -test_xml$(EXEEXT): test_xml.c $(LIBRARIES) - $(LINK) $(FLAGS) -DMAIN $(srcdir)/test_xml.c $(LDADD) $(LIBS) - charset2html$(EXEEXT): charset2html.c $(LIBRARIES) $(LINK) $(FLAGS) -DMAIN $(srcdir)/charset2html.c $(LDADD) $(LIBS) -testhash: testhash.c $(LIBRARIES) +testhash$(EXEEXT): testhash.c $(LIBRARIES) $(LINK) $(FLAGS) -DMAIN $(srcdir)/testhash.c $(LDADD) $(LIBS) # Don't update the files from bitkeeper diff --git a/mysys/charset.c b/mysys/charset.c index a192eab8eb6..2105877d928 100644 --- a/mysys/charset.c +++ b/mysys/charset.c @@ -389,7 +389,11 @@ static my_bool init_compiled_charsets(myf flags __attribute__((unused))) return FALSE; } +#ifdef __NETWARE__ +my_bool STDCALL init_available_charsets(myf myflags) +#else static my_bool init_available_charsets(myf myflags) +#endif { char fname[FN_REFLEN]; my_bool error=FALSE; diff --git a/mysys/default.c b/mysys/default.c index f5ada19dd78..06557f73d06 100644 --- a/mysys/default.c +++ b/mysys/default.c @@ -46,6 +46,8 @@ char *defaults_extra_file=0; const char *default_directories[]= { #ifdef __WIN__ "C:/", +#elif defined(__NETWARE__) +"sys:/etc/", #else "/etc/", #endif @@ -53,7 +55,7 @@ const char *default_directories[]= { DATADIR, #endif "", /* Place for defaults_extra_dir */ -#ifndef __WIN__ +#if !defined(__WIN__) && !defined(__NETWARE__) "~/", #endif NullS, diff --git a/mysys/mf_iocache.c b/mysys/mf_iocache.c index e9c35175bf9..0f35ee048bb 100644 --- a/mysys/mf_iocache.c +++ b/mysys/mf_iocache.c @@ -441,11 +441,10 @@ void init_io_cache_share(IO_CACHE *info, IO_CACHE_SHARE *s, uint num_threads) DBUG_ASSERT(info->type == READ_CACHE); pthread_mutex_init(&s->mutex, MY_MUTEX_INIT_FAST); pthread_cond_init (&s->cond, 0); - s->count=num_threads-1; - s->active=0; /* to catch errors */ + s->total=s->count=num_threads-1; + s->active=0; info->share=s; info->read_function=_my_b_read_r; - /* Ensure that the code doesn't use pointer to the IO_CACHE object */ info->current_pos= info->current_end= 0; } @@ -456,32 +455,37 @@ void init_io_cache_share(IO_CACHE *info, IO_CACHE_SHARE *s, uint num_threads) */ void remove_io_thread(IO_CACHE *info) { - pthread_mutex_lock(&info->share->mutex); - if (! info->share->count--) - pthread_cond_signal(&info->share->cond); - pthread_mutex_unlock(&info->share->mutex); + IO_CACHE_SHARE *s=info->share; + + pthread_mutex_lock(&s->mutex); + s->total--; + if (! s->count--) + pthread_cond_signal(&s->cond); + pthread_mutex_unlock(&s->mutex); } -static int lock_io_cache(IO_CACHE *info) +static int lock_io_cache(IO_CACHE *info, my_off_t pos) { - pthread_mutex_lock(&info->share->mutex); - if (!info->share->count) - return 1; + int total; + IO_CACHE_SHARE *s=info->share; - --(info->share->count); - pthread_cond_wait(&info->share->cond, &info->share->mutex); - /* - count can be -1 here, if one thread was removed (remove_io_thread) - while all others were locked (lock_io_cache). - If this is the case, this thread behaves as if count was 0 from the - very beginning, that is returns 1 and does not unlock the mutex. - */ - if (++(info->share->count)) + pthread_mutex_lock(&s->mutex); + if (!s->count) { - pthread_mutex_unlock(&info->share->mutex); - return 0; + s->count=s->total; + return 1; } - return 1; + + total=s->total; + s->count--; + while (!s->active || s->active->pos_in_file < pos) + pthread_cond_wait(&s->cond, &s->mutex); + + if (s->total < total) + return 1; + + pthread_mutex_unlock(&s->mutex); + return 0; } static void unlock_io_cache(IO_CACHE *info) @@ -532,7 +536,7 @@ int _my_b_read_r(register IO_CACHE *info, byte *Buffer, uint Count) info->error=(int) read_len; DBUG_RETURN(1); } - if (lock_io_cache(info)) + if (lock_io_cache(info, pos_in_file)) { info->share->active=info; if (info->seek_not_done) /* File touched, do seek */ @@ -1132,19 +1136,15 @@ int end_io_cache(IO_CACHE *info) DBUG_ENTER("end_io_cache"); #ifdef THREAD + /* + if IO_CACHE is shared between several threads, only one + thread needs to call end_io_cache() - just as init_io_cache() + should be called only once and then memcopy'ed + */ if (info->share) { -#ifdef SAFE_MUTEX - /* simple protection against multi-close: destroying share first */ - if (pthread_cond_destroy (&info->share->cond) | - pthread_mutex_destroy(&info->share->mutex)) - { - DBUG_RETURN(1); - } -#else pthread_cond_destroy (&info->share->cond); pthread_mutex_destroy(&info->share->mutex); -#endif info->share=0; } #endif diff --git a/mysys/mf_tempfile.c b/mysys/mf_tempfile.c index 09fde27afd6..cca80dcd552 100644 --- a/mysys/mf_tempfile.c +++ b/mysys/mf_tempfile.c @@ -24,7 +24,7 @@ #endif #ifdef HAVE_TEMPNAM -#if !defined( MSDOS) && !defined(OS2) +#if !defined(MSDOS) && !defined(OS2) && !defined(__NETWARE__) extern char **environ; #endif #endif @@ -129,7 +129,7 @@ File create_temp_file(char *to, const char *dir, const char *prefix, if (buffer[strlen(buffer)-1] == '\\') buffer[strlen(buffer)-1] = '\0'; putenv( buffer); -#else +#elif !defined(__NETWARE__) old_env= (char**) environ; if (dir) { /* Don't use TMPDIR if dir is given */ @@ -151,7 +151,7 @@ File create_temp_file(char *to, const char *dir, const char *prefix, { DBUG_PRINT("error",("Got error: %d from tempnam",errno)); } -#ifndef OS2 +#if !defined(OS2) && !defined(__NETWARE__) environ=(const char**) old_env; #endif } diff --git a/mysys/my_clock.c b/mysys/my_clock.c index e49b2f85b66..a192bde056d 100644 --- a/mysys/my_clock.c +++ b/mysys/my_clock.c @@ -17,14 +17,14 @@ #define USES_TYPES #include "my_global.h" -#if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(OS2) +#if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(OS2) && !defined(__NETWARE__) #include "mysys_priv.h" #include <sys/times.h> #endif long my_clock(void) { -#if !defined(MSDOS) && !defined(__WIN__) && !defined(OS2) +#if !defined(MSDOS) && !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) struct tms tmsbuf; VOID(times(&tmsbuf)); return (tmsbuf.tms_utime + tmsbuf.tms_stime); diff --git a/mysys/my_copy.c b/mysys/my_copy.c index a899835ea62..012eaec4ea8 100644 --- a/mysys/my_copy.c +++ b/mysys/my_copy.c @@ -80,7 +80,7 @@ int my_copy(const char *from, const char *to, myf MyFlags) if (MyFlags & MY_HOLD_ORIGINAL_MODES && new_file_stat) DBUG_RETURN(0); /* File copyed but not stat */ VOID(chmod(to, stat_buff.st_mode & 07777)); /* Copy modes */ -#if !defined(MSDOS) && !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) +#if !defined(MSDOS) && !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) && !defined(__NETWARE__) VOID(chown(to, stat_buff.st_uid,stat_buff.st_gid)); /* Copy ownership */ #endif #if !defined(VMS) && !defined(__ZTC__) diff --git a/mysys/my_getopt.c b/mysys/my_getopt.c index 21adb9374ce..c6fe606eaaf 100644 --- a/mysys/my_getopt.c +++ b/mysys/my_getopt.c @@ -300,7 +300,8 @@ int handle_options(int *argc, char ***argv, */ *((my_bool*) optp->value)= (my_bool) (!optend || *optend == '1'); (*argc)--; - continue; /* For GET_BOOL get_one_option() shouldn't be called */ + get_one_option(optp->id, optp, argument); + continue; } argument= optend; } @@ -348,7 +349,8 @@ int handle_options(int *argc, char ***argv, if (optp->var_type == GET_BOOL && optp->arg_type == NO_ARG) { *((my_bool*) optp->value)= (my_bool) 1; - continue; /* For GET_BOOL get_one_option() shouldn't be called */ + get_one_option(optp->id, optp, argument); + continue; } else if (optp->arg_type == REQUIRED_ARG || optp->arg_type == OPT_ARG) diff --git a/mysys/my_getwd.c b/mysys/my_getwd.c index 240b17ef87f..adf131c5fd0 100644 --- a/mysys/my_getwd.c +++ b/mysys/my_getwd.c @@ -32,7 +32,7 @@ #endif #ifdef __EMX__ -// chdir2 support also drive change +/* chdir2 support also drive change */ #define chdir _chdir2 #endif diff --git a/mysys/my_init.c b/mysys/my_init.c index ae7f78b7445..e18467b1235 100644 --- a/mysys/my_init.c +++ b/mysys/my_init.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -40,6 +40,12 @@ static my_bool win32_init_tcp_ip(); #else #define my_win_init() #endif +#ifdef __NETWARE__ +static void netware_init(); +#else +#define netware_init() +#endif + my_bool my_init_done=0; @@ -63,12 +69,16 @@ void my_init(void) if (my_init_done) return; my_init_done=1; +#if defined(THREAD) && defined(SAFE_MUTEX) + safe_mutex_global_init(); /* Must be called early */ +#endif + netware_init(); #ifdef THREAD #if defined(HAVE_PTHREAD_INIT) pthread_init(); /* Must be called before DBUG_ENTER */ #endif my_thread_global_init(); -#if !defined( __WIN__) && !defined(OS2) +#if !defined( __WIN__) && !defined(OS2) && !defined(__NETWARE__) sigfillset(&my_signals); /* signals blocked by mf_brkhant */ #endif #endif /* THREAD */ @@ -143,7 +153,7 @@ Voluntary context switches %ld, Involuntary context switches %ld\n", rus.ru_msgsnd, rus.ru_msgrcv, rus.ru_nsignals, rus.ru_nvcsw, rus.ru_nivcsw); #endif -#if defined(MSDOS) && !defined(__WIN__) +#if ( defined(MSDOS) || defined(__NETWARE__) ) && !defined(__WIN__) fprintf(info_file,"\nRun time: %.1f\n",(double) clock()/CLOCKS_PER_SEC); #endif #if defined(SAFEMALLOC) @@ -160,20 +170,26 @@ Voluntary context switches %ld, Involuntary context switches %ld\n", #endif } #ifdef THREAD - pthread_mutex_destroy(&THR_LOCK_keycache); - pthread_mutex_destroy(&THR_LOCK_malloc); - pthread_mutex_destroy(&THR_LOCK_open); DBUG_POP(); /* Must be done before my_thread_end */ my_thread_end(); my_thread_global_end(); -#endif +#if defined(SAFE_MUTEX) + /* + Check on destroying of mutexes. A few may be left that will get cleaned + up by C++ destructors + */ + safe_mutex_end(infoflag & MY_GIVE_INFO ? stderr : (FILE *) 0); +#endif /* defined(SAFE_MUTEX) */ +#endif /* THREAD */ + #ifdef __WIN__ - if (have_tcpip); - WSACleanup( ); + if (have_tcpip) + WSACleanup(); #endif /* __WIN__ */ - my_init_done=0; + my_init_done=0; } /* my_end */ + #ifdef __WIN__ /* @@ -262,10 +278,10 @@ static void my_win_init(void) /*------------------------------------------------------------------ -** Name: CheckForTcpip| Desc: checks if tcpip has been installed on system -** According to Microsoft Developers documentation the first registry -** entry should be enough to check if TCP/IP is installed, but as expected -** this doesn't work on all Win32 machines :( + Name: CheckForTcpip| Desc: checks if tcpip has been installed on system + According to Microsoft Developers documentation the first registry + entry should be enough to check if TCP/IP is installed, but as expected + this doesn't work on all Win32 machines :( ------------------------------------------------------------------*/ #define TCPIPKEY "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" @@ -291,6 +307,7 @@ static my_bool win32_have_tcpip(void) return (TRUE); } + static my_bool win32_init_tcp_ip() { if (win32_have_tcpip()) @@ -322,4 +339,64 @@ static my_bool win32_init_tcp_ip() } return(0); } -#endif +#endif /* __WIN__ */ + + +#ifdef __NETWARE__ +/**************************************************************************** + Do basic initialisation for netware needed by most programs +****************************************************************************/ + +static void netware_init() +{ + char cwd[PATH_MAX], *name + + /* init only if we are not a client library */ + if (my_progname) + { +#if SUPPORTED_BY_LIBC /* Removed until supported in Libc */ + struct termios tp; + /* Disable control characters */ + tcgetattr(STDIN_FILENO, &tp); + tp.c_cc[VINTR] = _POSIX_VDISABLE; + tp.c_cc[VEOF] = _POSIX_VDISABLE; + tp.c_cc[VSUSP] = _POSIX_VDISABLE; + tcsetattr(STDIN_FILENO, TCSANOW, &tp); +#endif /* SUPPORTED_BY_LIBC */ + + /* With stdout redirection */ + if (!isatty(STDOUT_FILENO)) + { + setscreenmode(SCR_AUTOCLOSE_ON_EXIT); /* auto close the screen */ + } + else + { + setscreenmode(SCR_NO_MODE); /* keep the screen up */ + } + + /* Parse program name and change to base format */ + name= my_progname; + for (; *name; name++) + { + if (*name == '\\') + { + *name = '/'; + } + else + { + *name = tolower(*name); + } + } + /* + Set the current working directory to the base directory of the file + name (assuming the binary is in 'base-file-name/bin/' + */ + strmov(cwd, my_progname); + if ((name= strindex(cwd, "/bin/")) != NULL) + { + *name= 0; + chdir(cwd); + } + } +} +#endif /* __NETWARE__ */ diff --git a/mysys/my_lock.c b/mysys/my_lock.c index 44ac53677ba..5058c301adb 100644 --- a/mysys/my_lock.c +++ b/mysys/my_lock.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -31,6 +31,9 @@ #define INCL_NOPMAPI #include <os2emx.h> #endif +#ifdef __NETWARE__ +#include <nks/fsio.h> +#endif /* Lock a part of a file */ @@ -41,6 +44,9 @@ int my_lock(File fd, int locktype, my_off_t start, my_off_t length, int value; ALARM_VARIABLES; #endif +#ifdef __NETWARE__ + int nxErrno; +#endif DBUG_ENTER("my_lock"); DBUG_PRINT("my",("Fd: %d Op: %d start: %ld Length: %ld MyFlags: %d", fd,locktype,(long) start,(long) length,MyFlags)); @@ -50,7 +56,47 @@ int my_lock(File fd, int locktype, my_off_t start, my_off_t length, if (my_disable_locking) DBUG_RETURN(0); -#if defined(__EMX__) || defined(OS2) +#if defined(__NETWARE__) + { + NXSOffset_t nxLength = length; + unsigned long nxLockFlags = 0; + + if (length == F_TO_EOF) + { + /* EOF is interpreted as a very large length. */ + nxLength = 0x7FFFFFFFFFFFFFFF; + } + + if (locktype == F_UNLCK) + { + /* The lock flags are currently ignored by NKS. */ + if (!(nxErrno= NXFileRangeUnlock(fd, 0L, start, nxLength))) + DBUG_RETURN(0); + } + else + { + if (locktype == F_RDLCK) + { + /* A read lock is mapped to a shared lock. */ + nxLockFlags = NX_RANGE_LOCK_SHARED; + } + else + { + /* A write lock is mapped to an exclusive lock. */ + nxLockFlags = NX_RANGE_LOCK_EXCL; + } + + if (MyFlags & MY_DONT_WAIT) + { + /* Don't block on the lock. */ + nxLockFlags |= NX_RANGE_LOCK_TRYLOCK; + } + + if (!(nxErrno= NXFileRangeLock(fd, nxLockFlags, start, nxLength))) + DBUG_RETURN(0); + } + } +#elif defined(__EMX__) || defined(OS2) if (!_lock64( fd, locktype, start, length, MyFlags)) DBUG_RETURN(0); @@ -103,8 +149,12 @@ int my_lock(File fd, int locktype, my_off_t start, my_off_t length, #endif /* HAVE_FCNTL */ #endif /* HAVE_LOCKING */ +#ifdef __NETWARE__ + my_errno = nxErrno; +#else /* We got an error. We don't want EACCES errors */ my_errno=(errno == EACCES) ? EAGAIN : errno ? errno : -1; +#endif if (MyFlags & MY_WME) { if (locktype == F_UNLCK) diff --git a/mysys/my_messnc.c b/mysys/my_messnc.c index 6bb88443109..1f9df3c7c2c 100644 --- a/mysys/my_messnc.c +++ b/mysys/my_messnc.c @@ -23,7 +23,11 @@ int my_message_no_curses(uint error __attribute__((unused)), DBUG_PRINT("enter",("message: %s",str)); (void) fflush(stdout); if (MyFlags & ME_BELL) +#ifdef __NETWARE__ + ringbell(); /* Bell */ +#else (void) fputc('\007',stderr); /* Bell */ +#endif /* __NETWARE__ */ if (my_progname) { (void)fputs(my_progname,stderr); (void)fputs(": ",stderr); diff --git a/mysys/my_netware.c b/mysys/my_netware.c new file mode 100644 index 00000000000..6c3242594df --- /dev/null +++ b/mysys/my_netware.c @@ -0,0 +1,150 @@ +/* Copyright (C) 2003 MySQL AB + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ + +/* + Function specific to netware +*/ + +#include <mysys_priv.h> +#ifdef __NETWARE__ + #include <library.h> + +/* + PMUserLicenseRequest is an API exported by the polimgr.nlm + (loaded by the NetWare OS when it comes up) for use by other + NLM-based NetWare products/services. + PMUserLicenseRequest provides a couple of functions: + 1) it will optionally request a User license or ensure that + one already exists for the specified User in userInfo + 2) it utilizes the NetWare usage metering service to + record usage information about your product/service. +*/ + +long PMMeteredUsageRequest +( + /* + NDS distinguished name or IP address or ??. asciiz string, e.g. + ".CN=Admin.O=this.T=MYTREE." + */ + char *userInfo, + long infoType, /* see defined values */ + /* + string used to identify the calling service, used to index the + metered info e.g. "iPrint" + */ + char *serviceID, + char tranAddrType, /* type of address that follows */ + char *tranAddr, /* ptr to a 10-byte array */ + long flags, /* see defined values */ + /* NLS error code, if any. NULL input is okay */ + long *licRequestErrCode, + /* meter service error code, if any. NULL input is okay */ + long *storeMeterInfoErrCode, + /* + error code from NLSMeter if + storeMeterInfoErrCode == PM_LICREQ_NLSMETERERROR. + NULL input is okay + */ + long *NLSMeterErrCode +); + +ypedef long(*PMUR)(char*, long, char*, char, char*, long, long*, long*, + long*); + +/* infoType */ +/* indicates that the info in the userInfo param is an NDS user */ +#define PM_USERINFO_TYPE_NDS 1 +/* indicates that the info in the userInfo param is NOT an NDS user */ +#define PM_USERINFO_TYPE_ADDRESS 2 + +/* Flags */ + +/* + Tells the service that it should not check to see if the NDS user + contained in the userInfo param has a NetWare User License - just + record metering information; this is ignored if infoType != + PM_USERINFO_TYPE_NDS +*/ + +#define PM_FLAGS_METER_ONLY 0x0000001 + +/* + Indicates that the values in the userInfo and serviceID parameters + are unicode strings, so that the metering service bypasses + converting these to unicode (again) +*/ +#define PM_LICREQ_ALREADY_UNICODE 0x0000002 +/* + Useful only if infoType is PM_USERINFO_TYPE_NDS - indicates a "no + stop" policy of the calling service +*/ +#define PM_LICREQ_ALWAYS_METER 0x0000004 + + +/* + net Address Types - system-defined types of net addresses that can + be used in the tranAddrType field +*/ + +#define NLS_TRAN_TYPE_IPX 0x00000001 /* An IPX address */ +#define NLS_TRAN_TYPE_IP 0x00000008 /* An IP address */ +#define NLS_ADDR_TYPE_MAC 0x000000F1 /* a MAC address */ + +/* + Net Address Sizes - lengths that correspond to the tranAddrType + field (just fyi) +*/ +#define NLS_IPX_ADDR_SIZE 10 /* the size of an IPX address */ +#define NLS_IP_ADDR_SIZE 4 /* the size of an IP address */ +#define NLS_MAC_ADDR_SIZE 6 /* the size of a MAC address */ + + +void netware_reg_user(const char *ip, const char *user, + const char *application) +{ + PMUR usage_request; + long licRequestErrCode = 0; + long storeMeterInfoErrCode = 0; + long nlsMeterErrCode = 0; + + /* import the symbol */ + usage_request= ((PMUR)ImportPublicObject(getnlmhandle(), + "PMMeteredUsageRequest")); + if (usage_request != NULL) + { + unsigned long iaddr; + char addr[NLS_IPX_ADDR_SIZE]; + + /* create address */ + iaddr = htonl(inet_addr(ip)); + bzero(addr, NLS_IPX_ADDR_SIZE); + memcpy(addr, &iaddr, NLS_IP_ADDR_SIZE); + + /* call to NLS */ + usage_request(user, + PM_USERINFO_TYPE_ADDRESS, + application, + NLS_TRAN_TYPE_IP, + addr, + PM_FLAGS_METER_ONLY, + &licRequestErrCode, + &storeMeterInfoErrCode, + &nlsMeterErrCode); + /* release symbol */ + UnImportPublicObject(getnlmhandle(), "PMMeteredUsageRequest"); + } +} +#endif /* __NETWARE__ */ diff --git a/mysys/my_os2cond.c b/mysys/my_os2cond.c index d930aadb2d1..e23afb89e66 100644 --- a/mysys/my_os2cond.c +++ b/mysys/my_os2cond.c @@ -26,7 +26,6 @@ #include "mysys_priv.h" #if defined(THREAD) && defined(OS2) #include <m_string.h> -//#undef getpid #include <process.h> #include <sys/timeb.h> diff --git a/mysys/my_os2dirsrch.c b/mysys/my_os2dirsrch.c index 773d6800d1e..8d1f6ddd947 100644 --- a/mysys/my_os2dirsrch.c +++ b/mysys/my_os2dirsrch.c @@ -1,4 +1,4 @@ -/* Copyright (C) Yuri Dario & 2000 MySQL AB +/* Copyright (C) Yuri Dario & 2000-2003 MySQL AB All the above parties has a full, independent copyright to the following code, including the right to use the code in any manner without any demands from the other parties. @@ -18,77 +18,79 @@ Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ + /* Win32 directory search emulation */ #if defined(OS2) -//#define _DEBUG - long _findfirst( char* path, struct _finddata_t* dos_file) { - HDIR hdir = HDIR_CREATE; - APIRET rc; - FILEFINDBUF3 buf3; - ULONG entries = 1; + HDIR hdir = HDIR_CREATE; + APIRET rc; + FILEFINDBUF3 buf3; + ULONG entries = 1; #ifdef _DEBUG - printf( "_findfirst path %s\n", path); + printf( "_findfirst path %s\n", path); #endif - memset( &buf3, 0, sizeof( buf3)); - rc = DosFindFirst( - path, /* Address of the ASCIIZ path name of the file or subdirectory to be found. */ - &hdir, /* Address of the handle associated with this DosFindFirst request. */ - FILE_NORMAL | FILE_DIRECTORY, /* Attribute value that determines the file objects to be searched for. */ - &buf3, /* Result buffer. */ - sizeof( buf3), /* The length, in bytes, of pfindbuf. */ - &entries, /* Pointer to the number of entries: */ - FIL_STANDARD); /* The level of file information required. */ + memset( &buf3, 0, sizeof( buf3)); + rc = DosFindFirst( + path, /* The ASCIIZ path name of the file or subdirectory to be found. */ + &hdir, /* The handle associated with this DosFindFirst request. */ + FILE_NORMAL | FILE_DIRECTORY, /* Attribute value that determines the file objects to be searched for. */ + &buf3, /* Result buffer. */ + sizeof( buf3), /* The length, in bytes, of pfindbuf. */ + &entries, /* Pointer to the number of entries: */ + FIL_STANDARD); /* The level of file information required. */ #ifdef _DEBUG - printf( "_findfirst rc=%d hdir=%d entries=%d->%s\n", rc, hdir, entries, buf3.achName); + printf( "_findfirst rc=%d hdir=%d entries=%d->%s\n", rc, hdir, entries, + buf3.achName); #endif - if (rc /* && entries == 0 */) - return -1; - - if (dos_file) { - memset( dos_file, 0, sizeof( struct _finddata_t)); - strcpy( dos_file->name, buf3.achName); - dos_file->size = buf3.cbFile; - dos_file->attrib = buf3.attrFile; - } - return (ULONG) hdir; + if (rc /* && entries == 0 */) + return -1; + + if (dos_file) + { + memset( dos_file, 0, sizeof( struct _finddata_t)); + strcpy( dos_file->name, buf3.achName); + dos_file->size = buf3.cbFile; + dos_file->attrib = buf3.attrFile; + } + return (ULONG) hdir; } long _findnext( long hdir, struct _finddata_t* dos_file) { - APIRET rc; - FILEFINDBUF3 buf3; - ULONG entries = 1; + APIRET rc; + FILEFINDBUF3 buf3; + ULONG entries = 1; - memset( &buf3, 0, sizeof( buf3)); - rc = DosFindNext( - hdir, - &buf3, /* Result buffer. */ - sizeof( buf3), /* The length, in bytes, of pfindbuf. */ - &entries); /* Pointer to the number of entries: */ + memset( &buf3, 0, sizeof( buf3)); + rc = DosFindNext(hdir, + &buf3, /* Result buffer. */ + sizeof( buf3), /* Length, in bytes, of pfindbuf. */ + &entries); /* Pointer to the number of entries */ #ifdef _DEBUG - printf( "_findnext rc=%d hdir=%d entries=%d->%s\n", rc, hdir, entries, buf3.achName); + printf( "_findnext rc=%d hdir=%d entries=%d->%s\n", rc, hdir, entries, + buf3.achName); #endif - if (rc /* && entries == 0 */) - return -1; - - if (dos_file) { - memset( dos_file, 0, sizeof( struct _finddata_t)); - strcpy( dos_file->name, buf3.achName); - dos_file->size = buf3.cbFile; - dos_file->attrib = buf3.attrFile; - } - return 0; + if (rc /* && entries == 0 */) + return -1; + + if (dos_file) + { + memset( dos_file, 0, sizeof( struct _finddata_t)); + strcpy( dos_file->name, buf3.achName); + dos_file->size = buf3.cbFile; + dos_file->attrib = buf3.attrFile; + } + return 0; } void _findclose( long hdir) @@ -101,82 +103,82 @@ void _findclose( long hdir) #endif } -DIR* opendir( char* path) +DIR* opendir(char* path) { - DIR* dir = (DIR*) calloc( 1, sizeof( DIR)); - char buffer[260]; - APIRET rc; - ULONG entries = 1; + DIR* dir = (DIR*) calloc(1, sizeof( DIR)); + char buffer[260]; + APIRET rc; + ULONG entries = 1; - strcpy( buffer, path); - strcat( buffer, "*.*"); + strmov(strmov(buffer, path), "*.*"); #ifdef _DEBUG - printf( "_findfirst path %s\n", buffer); + printf( "_findfirst path %s\n", buffer); #endif - dir->hdir = HDIR_CREATE; - memset( &dir->buf3, 0, sizeof( dir->buf3)); - rc = DosFindFirst( - buffer, /* Address of the ASCIIZ path name of the file or subdirectory to be found. */ - &dir->hdir, /* Address of the handle associated with this DosFindFirst request. */ - FILE_NORMAL | FILE_DIRECTORY, /* Attribute value that determines the file objects to be searched for. */ - &dir->buf3, /* Result buffer. */ - sizeof( dir->buf3), /* The length, in bytes, of pfindbuf. */ - &entries, /* Pointer to the number of entries: */ - FIL_STANDARD); /* The level of file information required. */ + dir->hdir = HDIR_CREATE; + memset( &dir->buf3, 0, sizeof( dir->buf3)); + rc = DosFindFirst( + buffer, /* Address of the ASCIIZ path name of the file or subdirectory to be found. */ + &dir->hdir, /* Address of the handle associated with this DosFindFirst request. */ + FILE_NORMAL | FILE_DIRECTORY, /* Attribute value that determines the file objects to be searched for. */ + &dir->buf3, /* Result buffer. */ + sizeof( dir->buf3), /* The length, in bytes, of pfindbuf. */ + &entries, /* Pointer to the number of entries: */ + FIL_STANDARD); /* The level of file information required. */ #ifdef _DEBUG - printf( "opendir rc=%d hdir=%d entries=%d->%s\n", rc, dir->hdir, entries, dir->buf3.achName); + printf( "opendir rc=%d hdir=%d entries=%d->%s\n", rc, dir->hdir, entries, dir->buf3.achName); #endif - if (rc /* && entries == 0 */) - return NULL; + if (rc /* && entries == 0 */) + return NULL; - return dir; + return dir; } + struct dirent* readdir( DIR* dir) { - APIRET rc; - //FILEFINDBUF3 buf3; - ULONG entries = 1; + APIRET rc; + ULONG entries = 1; - if (!dir->buf3.achName[0]) // file not found on previous query - return NULL; + if (!dir->buf3.achName[0]) /* file not found on previous query */ + return NULL; - // copy last file name - strcpy( dir->ent.d_name, dir->buf3.achName); + /* copy last file name */ + strcpy( dir->ent.d_name, dir->buf3.achName); - // query next file - memset( &dir->buf3, 0, sizeof( dir->buf3)); - rc = DosFindNext( - dir->hdir, - &dir->buf3, /* Result buffer. */ - sizeof( dir->buf3), /* The length, in bytes, of pfindbuf. */ - &entries); /* Pointer to the number of entries: */ + /* query next file */ + memset( &dir->buf3, 0, sizeof( dir->buf3)); + rc= DosFindNext( + dir->hdir, + &dir->buf3, /* Result buffer. */ + sizeof(dir->buf3), /* Length, in bytes, of pfindbuf. */ + &entries); /* Pointer to the number of entries */ #ifdef _DEBUG - printf( "_findnext rc=%d hdir=%d entries=%d->%s\n", rc, dir->hdir, entries, dir->buf3.achName); + printf( "_findnext rc=%d hdir=%d entries=%d->%s\n", rc, dir->hdir, entries, + dir->buf3.achName); #endif - if (rc /* && entries == 0 */) - strcpy( dir->buf3.achName, ""); // reset name for next query + if (rc /* && entries == 0 */) + *dir->buf3.achName= 0; /* reset name for next query */ - return &dir->ent; + return &dir->ent; } + int closedir (DIR *dir) { - APIRET rc; + APIRET rc; - rc = DosFindClose( dir->hdir); + rc = DosFindClose( dir->hdir); #ifdef _DEBUG - printf( "_findclose rc=%d hdir=%d\n", rc, dir->hdir); + printf( "_findclose rc=%d hdir=%d\n", rc, dir->hdir); #endif - free(dir); - return 0; + free(dir); + return 0; } - -#endif // OS2 +#endif /* OS2 */ diff --git a/mysys/my_os2dirsrch.h b/mysys/my_os2dirsrch.h index e894d27b576..3889f628bad 100644 --- a/mysys/my_os2dirsrch.h +++ b/mysys/my_os2dirsrch.h @@ -29,26 +29,35 @@ extern "C" { struct _finddata_t { - unsigned attrib; - //unsigned long time_create; /* -1 for FAT file systems */ - //unsigned long time_access; /* -1 for FAT file systems */ - //unsigned long time_write; - unsigned long size; - char name[260]; - //uint16 wr_date; - //uint16 wr_time; + unsigned attrib; +#ifdef NOT_USED + unsigned long time_create; /* -1 for FAT file systems */ + unsigned long time_access; /* -1 for FAT file systems */ + unsigned long time_write; +#endif + unsigned long size; + char name[260]; +#ifdef NOT_USED + uint16 wr_date; + uint16 wr_time; +#endif }; + struct dirent { - //unsigned attrib; - //unsigned long time_create; /* -1 for FAT file systems */ - //unsigned long time_access; /* -1 for FAT file systems */ - //unsigned long time_write; - //unsigned long size; - char d_name[260]; - //uint16 wr_date; - //uint16 wr_time; +#ifdef NOT_USED + unsigned attrib; + unsigned long time_create; /* -1 for FAT file systems */ + unsigned long time_access; /* -1 for FAT file systems */ + unsigned long time_write; + unsigned long size; +#endif + char d_name[260]; +#ifdef NOT_USED + uint16 wr_date; + uint16 wr_time; +#endif }; struct DIR @@ -62,16 +71,18 @@ DIR *opendir ( char *); struct dirent *readdir (DIR *); int closedir (DIR *); -//#define _A_NORMAL FILE_NORMAL -//#define _A_SUBDIR FILE_DIRECTORY -//#define _A_RDONLY FILE_READONLY +#ifdef NOT_USED +#define _A_NORMAL FILE_NORMAL +#define _A_SUBDIR FILE_DIRECTORY +#define _A_RDONLY FILE_READONLY -//long _findfirst( char*, struct _finddata_t*); -//long _findnext( long, struct _finddata_t*); -//void _findclose( long); +long _findfirst( char*, struct _finddata_t*); +long _findnext( long, struct _finddata_t*); +void _findclose( long); +#endif #ifdef __cplusplus_00 } #endif -#endif // __MY_OS2DIRSRCH2_H__ +#endif /* __MY_OS2DIRSRCH2_H__ */ diff --git a/mysys/my_os2file64.c b/mysys/my_os2file64.c index bc24c92b87f..786e083adc4 100644 --- a/mysys/my_os2file64.c +++ b/mysys/my_os2file64.c @@ -24,10 +24,11 @@ int _lock64( int fd, int locktype, my_off_t start, my_off_t length, myf MyFlags); int _sopen64( const char *name, int oflag, int shflag, int mask); -// -// this class is used to define a global c++ variable, that -// is initialized before main() gets called. -// +/* + This class is used to define a global c++ variable, that + is initialized before main() gets called. +*/ + class File64bit { public: @@ -150,7 +151,7 @@ static unsigned char const errno_tab[] = _DosSetFilePtrL = NULL; return; } - // notify success + /* notify success */ #ifdef MYSQL_SERVER printf( "WSeB 64bit file API loaded.\n"); #endif @@ -164,230 +165,230 @@ void _OS2errno( APIRET rc) errno = errno_tab[rc]; } -longlong _lseek64( int fd, longlong offset, int seektype) -{ - APIRET rc; - longlong actual; - - if (_DosSetFilePtrL) - rc = _DosSetFilePtrL( fd, offset, seektype, &actual); - else { - ULONG ulActual; - rc = DosSetFilePtr( fd, (long) offset, seektype, &ulActual); - actual = ulActual; - } - - if (!rc) - return( actual);/* NO_ERROR */ - - // set errno - _OS2errno( rc); - // seek failed - return(-1); -} -inline _SetFileLocksL(HFILE hFile, - PFILELOCKL pflUnlock, - PFILELOCKL pflLock, - ULONG timeout, - ULONG flags) +longlong _lseek64( int fd, longlong offset, int seektype) { - if (_DosSetFileLocksL) { - APIRET rc; - rc = _DosSetFileLocksL( hFile, pflUnlock, pflLock, timeout, flags); + APIRET rc; + longlong actual; - // on FAT/HPFS/LAN a INVALID_PARAMETER is returned, seems that - // only JFS can handle >2GB ranges. - if (rc != 87) - return rc; + if (_DosSetFilePtrL) + rc = _DosSetFilePtrL( fd, offset, seektype, &actual); + else + { + ULONG ulActual; + rc = DosSetFilePtr( fd, (long) offset, seektype, &ulActual); + actual = ulActual; + } - // got INVALID_PARAMETER, fallback to standard call - } + if (!rc) + return( actual); /* NO_ERROR */ - FILELOCK flUnlock = { pflUnlock->lOffset, pflUnlock->lRange }; - FILELOCK flLock = { pflLock->lOffset, pflLock->lRange }; - return DosSetFileLocks( hFile, &flUnlock, &flLock, timeout, flags); + _OS2errno( rc); /* set errno */ + return(-1); /* seek failed */ } -int _lock64( int fd, int locktype, my_off_t start, - my_off_t length, myf MyFlags) -{ - FILELOCKL LockArea = {0,0}, UnlockArea = {0,0}; - ULONG readonly = 0; - APIRET rc = -1; - - switch( locktype) { - case F_UNLCK: - UnlockArea.lOffset = start; - UnlockArea.lRange = length ? length : LONGLONG_MAX; - break; - - case F_RDLCK: - case F_WRLCK: - LockArea.lOffset = start; - LockArea.lRange = length ? length : LONGLONG_MAX; - readonly = (locktype == F_RDLCK ? 1 : 0); - break; - - default: - errno = EINVAL; - rc = -1; - break; - } - - if (MyFlags & MY_DONT_WAIT) { - - rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 0, readonly); - //printf( "fd %d, locktype %d, rc %d (dont_wait)\n", fd, locktype, rc); - if (rc == 33) { /* Lock Violation */ - - DBUG_PRINT("info",("Was locked, trying with timeout")); - rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 1 * 1000, readonly); - //printf( "fd %d, locktype %d, rc %d (dont_wait with timeout)\n", fd, locktype, rc); - } - - } else { - - while( rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 0, readonly) && (rc == 33)) { - printf("."); - DosSleep(1 * 1000); - } - //printf( "fd %d, locktype %d, rc %d (wait2)\n", fd, locktype, rc); - } - - if (!rc) - return( 0);/* NO_ERROR */ - // set errno - _OS2errno( rc); - // lock failed - return(-1); +inline APIRET _SetFileLocksL(HFILE hFile, + PFILELOCKL pflUnlock, + PFILELOCKL pflLock, + ULONG timeout, + ULONG flags) +{ + if (_DosSetFileLocksL) + { + APIRET rc; + rc = _DosSetFileLocksL( hFile, pflUnlock, pflLock, timeout, flags); + + /* + on FAT/HPFS/LAN a INVALID_PARAMETER is returned, seems that + only JFS can handle >2GB ranges. + */ + if (rc != 87) + return rc; + /* got INVALID_PARAMETER, fallback to standard call */ + } + + FILELOCK flUnlock = { pflUnlock->lOffset, pflUnlock->lRange }; + FILELOCK flLock = { pflLock->lOffset, pflLock->lRange }; + return DosSetFileLocks( hFile, &flUnlock, &flLock, timeout, flags); } -int sopen( const char *name, int oflag, int shflag, int mask) + +int _lock64( int fd, int locktype, my_off_t start, + my_off_t length, myf MyFlags) { - int fail_errno; - APIRET rc = 0; - HFILE hf = 0; - ULONG ulAction = 0; - LONGLONG cbFile = 0; - ULONG ulAttribute = FILE_NORMAL; - ULONG fsOpenFlags = 0; - ULONG fsOpenMode = 0; - - /* Extract the access mode and sharing mode bits. */ - fsOpenMode = (shflag & 0xFF) | (oflag & 0x03); - - /* Translate ERROR_OPEN_FAILED to ENOENT unless O_EXCL is set (see - below). */ - fail_errno = ENOENT; - - /* Compute `open_flag' depending on `flags'. Note that _SO_CREAT is - set for O_CREAT. */ - - if (oflag & O_CREAT) - { - if (oflag & O_EXCL) - { - fsOpenFlags = OPEN_ACTION_FAIL_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW; - fail_errno = EEXIST; - } - else if (oflag & O_TRUNC) - fsOpenFlags = OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW; - else - fsOpenFlags = OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW; - - if (mask & S_IWRITE) - ulAttribute = FILE_NORMAL; - else - ulAttribute = FILE_READONLY; + FILELOCKL LockArea = {0,0}, UnlockArea = {0,0}; + ULONG readonly = 0; + APIRET rc = -1; + + switch (locktype) { + case F_UNLCK: + UnlockArea.lOffset = start; + UnlockArea.lRange = length ? length : LONGLONG_MAX; + break; + + case F_RDLCK: + case F_WRLCK: + LockArea.lOffset = start; + LockArea.lRange = length ? length : LONGLONG_MAX; + readonly = (locktype == F_RDLCK ? 1 : 0); + break; + + default: + errno = EINVAL; + rc = -1; + break; + } + + if (MyFlags & MY_DONT_WAIT) + { + rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 0, readonly); + /* printf("fd %d, locktype %d, rc %d (dont_wait)\n", fd, locktype, rc); */ + if (rc == 33) { /* Lock Violation */ + + DBUG_PRINT("info",("Was locked, trying with timeout")); + rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 1 * 1000, readonly); + /* printf( "fd %d, locktype %d, rc %d (dont_wait with timeout)\n", fd, locktype, rc); */ + } + } + else + { + while (rc = _SetFileLocksL( fd, &UnlockArea, &LockArea, 0, readonly) && + (rc == 33)) + { + printf("."); + DosSleep(1 * 1000); + } + /* printf( "fd %d, locktype %d, rc %d (wait2)\n", fd, locktype, rc); */ + } + if (!rc) + return(0); /* NO_ERROR */ + _OS2errno( rc); /* set errno */ + return(-1); /* lock failed */ +} - } - else if (oflag & O_TRUNC) - fsOpenFlags = OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW; - else - fsOpenFlags = OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW; - - /* Try to open the file and handle errors. */ - if (_DosOpenL) - rc = _DosOpenL( name, &hf, &ulAction, cbFile, - ulAttribute, fsOpenFlags, fsOpenMode, NULL); - else - rc = DosOpen( name, &hf, &ulAction, (LONG) cbFile, - ulAttribute, fsOpenFlags, fsOpenMode, NULL); - - if (rc == ERROR_OPEN_FAILED) - { - errno = fail_errno; - return -1; - } - if (rc != 0) - { - // set errno - _OS2errno( rc); - return -1; - } - if (oflag & O_APPEND) - _lseek64( hf, 0L, SEEK_END); +int sopen(const char *name, int oflag, int shflag, int mask) +{ + int fail_errno; + APIRET rc = 0; + HFILE hf = 0; + ULONG ulAction = 0; + LONGLONG cbFile = 0; + ULONG ulAttribute = FILE_NORMAL; + ULONG fsOpenFlags = 0; + ULONG fsOpenMode = 0; + + /* Extract the access mode and sharing mode bits. */ + fsOpenMode = (shflag & 0xFF) | (oflag & 0x03); + + /* + Translate ERROR_OPEN_FAILED to ENOENT unless O_EXCL is set (see + below). + */ + fail_errno = ENOENT; + + /* + Compute `open_flag' depending on `flags'. Note that _SO_CREAT is + set for O_CREAT. + */ + + if (oflag & O_CREAT) + { + if (oflag & O_EXCL) + { + fsOpenFlags = OPEN_ACTION_FAIL_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW; + fail_errno = EEXIST; + } + else if (oflag & O_TRUNC) + fsOpenFlags = OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW; + else + fsOpenFlags = OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW; + + if (mask & S_IWRITE) + ulAttribute = FILE_NORMAL; + else + ulAttribute = FILE_READONLY; + + } + else if (oflag & O_TRUNC) + fsOpenFlags = OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW; + else + fsOpenFlags = OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW; - return hf; + /* Try to open the file and handle errors. */ + if (_DosOpenL) + rc = _DosOpenL( name, &hf, &ulAction, cbFile, + ulAttribute, fsOpenFlags, fsOpenMode, NULL); + else + rc = DosOpen( name, &hf, &ulAction, (LONG) cbFile, + ulAttribute, fsOpenFlags, fsOpenMode, NULL); + + if (rc == ERROR_OPEN_FAILED) + { + errno = fail_errno; + return -1; + } + if (rc != 0) + { + _OS2errno( rc); /* set errno */ + return -1; + } + if (oflag & O_APPEND) + _lseek64( hf, 0L, SEEK_END); + return hf; } -int read( int fd, void *buffer, unsigned int count) -{ - APIRET rc; - ULONG actual; - rc = DosRead( fd, (PVOID) buffer, count, &actual); +int read(int fd, void *buffer, unsigned int count) +{ + APIRET rc; + ULONG actual; - if (!rc) - return( actual);/* NO_ERROR */ + rc= DosRead( fd, (PVOID) buffer, count, &actual); - // set errno - _OS2errno( rc); - // write failed - return(-1); + if (!rc) + return( actual); /* NO_ERROR */ + _OS2errno( rc); /* set errno */ + return(-1); /* read failed */ } -int write( int fd, const void *buffer, unsigned int count) -{ - APIRET rc; - ULONG actual; - rc = DosWrite( fd, (PVOID) buffer, count, &actual); +int write(int fd, const void *buffer, unsigned int count) +{ + APIRET rc; + ULONG actual; - if (!rc) - return( actual);/* NO_ERROR */ + rc = DosWrite( fd, (PVOID) buffer, count, &actual); - // set errno - _OS2errno( rc); - // write failed - return(-1); + if (!rc) + return( actual); /* NO_ERROR */ + _OS2errno( rc); /* set errno */ + return(-1); /* write failed */ } -int close( int fd) -{ - APIRET rc; - ULONG actual; - rc = DosClose( fd); +int close( int fd) +{ + APIRET rc; + ULONG actual; - if (!rc) - return( 0);/* NO_ERROR */ + rc = DosClose( fd); - // set errno - _OS2errno( rc); - // write failed - return(-1); + if (!rc) + return( 0); /* NO_ERROR */ + _OS2errno( rc); /* set errno */ + return(-1); /* close failed */ } -inline int open( const char *name, int oflag) + +int open( const char *name, int oflag) { return sopen( name, oflag, OPEN_SHARE_DENYNONE, S_IREAD | S_IWRITE); } -inline int open( const char *name, int oflag, int mask) + +int open( const char *name, int oflag, int mask) { return sopen( name, oflag, OPEN_SHARE_DENYNONE, mask); } diff --git a/mysys/my_os2mutex.c b/mysys/my_os2mutex.c index 718aa9f2932..5010d6e8dd5 100644 --- a/mysys/my_os2mutex.c +++ b/mysys/my_os2mutex.c @@ -36,63 +36,48 @@ #include <stdlib.h> #include <errno.h> #ifdef _THREAD_SAFE -//#include <pthread.h> -//#include "pthread_private.h" int pthread_mutex_init(pthread_mutex_t * mutex, const pthread_mutexattr_t * mutex_attr) { - APIRET rc = 0; - - rc = DosCreateMutexSem(NULL,mutex,0,0); - - /* Return the completion status: */ - return (0); + (void) DosCreateMutexSem(NULL,mutex,0,0); + return (0); /* Return the completion status: */ } + int pthread_mutex_destroy(pthread_mutex_t * mutex) { - APIRET rc = 0; - + APIRET rc; - do { - rc = DosCloseMutexSem(*mutex); - if (rc == 301) DosReleaseMutexSem(*mutex); - } while (rc == 301); + do + { + rc = DosCloseMutexSem(*mutex); + if (rc == 301) DosReleaseMutexSem(*mutex); + } while (rc == 301); - *mutex = 0; - - /* Return the completion status: */ - return (0); + *mutex = 0; + return (0); /* Return the completion status: */ } int pthread_mutex_lock(pthread_mutex_t * mutex) { - int ret = 0; - int status = 0; - APIRET rc = 0; + APIRET rc; - rc = DosRequestMutexSem(*mutex,SEM_INDEFINITE_WAIT); - if (rc) - return(EINVAL); - /* Return the completion status: */ - return (0); + rc = DosRequestMutexSem(*mutex,SEM_INDEFINITE_WAIT); + if (rc) + return(EINVAL); + return (0); /* Return the completion status: */ } + int pthread_mutex_unlock(pthread_mutex_t * mutex) { - int ret = 0; - APIRET rc = 0; - int status; - - rc = DosReleaseMutexSem(*mutex); - - /* Return the completion status: */ - return (0); + (void) DosReleaseMutexSem(*mutex); + return (0); /* Return the completion status: */ } #endif diff --git a/mysys/my_os2thread.c b/mysys/my_os2thread.c index 6f196f43d75..0696f480a91 100644 --- a/mysys/my_os2thread.c +++ b/mysys/my_os2thread.c @@ -61,10 +61,9 @@ static pthread_handler_decl(pthread_start,param) win_pthread_self=((struct pthread_map *) param)->pthreadself; pthread_mutex_unlock(&THR_LOCK_thread); free((char*) param); /* Free param from create */ - //pthread_exit((void*) (*func)(func_param)); + /* pthread_exit((void*) (*func)(func_param)); */ (*func)(func_param); DBUG_RETURN(0); - //return 0; /* Safety */ } diff --git a/mysys/my_os2tls.c b/mysys/my_os2tls.c index 1598fa34e2b..f7cf3b09283 100644 --- a/mysys/my_os2tls.c +++ b/mysys/my_os2tls.c @@ -30,115 +30,122 @@ PULONG tls_storage; /* TLS local storage */ DWORD tls_bits[2]; /* TLS in-use bits */ pthread_mutex_t tls_mutex; /* TLS mutex for in-use bits */ + DWORD TlsAlloc( void) { - DWORD index = -1; - DWORD mask, tibidx; - int i; - - if (tls_storage == NULL) { - - APIRET rc; - - // allocate memory for TLS storage - rc = DosAllocThreadLocalMemory( 1, &tls_storage); - if (rc) { - fprintf( stderr, "DosAllocThreadLocalMemory error: return code = %u\n", rc); - } - - // create a mutex - if (pthread_mutex_init( &tls_mutex, NULL)) - fprintf( stderr, "Failed to init TLS mutex\n"); - } - - pthread_mutex_lock( &tls_mutex); - - tibidx = 0; - if (tls_bits[0] == 0xFFFFFFFF) { - if (tls_bits[1] == 0xFFFFFFFF) { - fprintf( stderr, "tid#%d, no more TLS bits available\n", _threadid); - pthread_mutex_unlock( &tls_mutex); - return -1; - } - tibidx = 1; - } - for( i=0; i<32; i++) { - mask = (1 << i); - if ((tls_bits[ tibidx] & mask) == 0) { - tls_bits[ tibidx] |= mask; - index = (tibidx*32) + i; - break; - } - } - tls_storage[index] = 0; - - pthread_mutex_unlock( &tls_mutex); - - //fprintf( stderr, "tid#%d, TlsAlloc index %d\n", _threadid, index); - - return index; + DWORD index = -1; + DWORD mask, tibidx; + int i; + + if (tls_storage == NULL) + { + + APIRET rc; + + /* allocate memory for TLS storage */ + rc = DosAllocThreadLocalMemory( 1, &tls_storage); + if (rc) + fprintf( stderr, "DosAllocThreadLocalMemory error: return code = %u\n", + rc); + /* create a mutex */ + if (pthread_mutex_init( &tls_mutex, NULL)) + fprintf( stderr, "Failed to init TLS mutex\n"); + } + + pthread_mutex_lock( &tls_mutex); + + tibidx = 0; + if (tls_bits[0] == 0xFFFFFFFF) + { + if (tls_bits[1] == 0xFFFFFFFF) + { + fprintf( stderr, "tid#%d, no more TLS bits available\n", _threadid); + pthread_mutex_unlock( &tls_mutex); + return -1; + } + tibidx = 1; + } + + for (i=0; i<32; i++) + { + mask = (1 << i); + if ((tls_bits[ tibidx] & mask) == 0) + { + tls_bits[ tibidx] |= mask; + index = (tibidx*32) + i; + break; + } + } + tls_storage[index] = 0; + + pthread_mutex_unlock( &tls_mutex); + /* fprintf( stderr, "tid#%d, TlsAlloc index %d\n", _threadid, index); */ + return index; } -BOOL TlsFree( DWORD index) +BOOL TlsFree( DWORD index) { - int tlsidx; - DWORD mask; - - if (index >= TLS_MINIMUM_AVAILABLE) - return NULL; - - pthread_mutex_lock( &tls_mutex); - - tlsidx = 0; - if (index > 32) { - tlsidx++; - } - mask = (1 << index); - if (tls_bits[ tlsidx] & mask) { - tls_bits[tlsidx] &= ~mask; - tls_storage[index] = 0; - pthread_mutex_unlock( &tls_mutex); - return TRUE; - } + int tlsidx; + DWORD mask; - pthread_mutex_unlock( &tls_mutex); - return FALSE; -} + if (index >= TLS_MINIMUM_AVAILABLE) + return NULL; + pthread_mutex_lock( &tls_mutex); -PVOID TlsGetValue( DWORD index) -{ - if (index >= TLS_MINIMUM_AVAILABLE) - return NULL; - - // verify if memory has been allocated for this thread - if (*tls_storage == NULL) { - // allocate memory for indexes - *tls_storage = (ULONG)calloc( TLS_MINIMUM_AVAILABLE, sizeof(int)); - //fprintf( stderr, "tid#%d, tls_storage %x\n", _threadid, *tls_storage); - } - - ULONG* tls_array = (ULONG*) *tls_storage; - return (PVOID) tls_array[ index]; + tlsidx = 0; + if (index > 32) + tlsidx++; + + mask = (1 << index); + if (tls_bits[ tlsidx] & mask) + { + tls_bits[tlsidx] &= ~mask; + tls_storage[index] = 0; + pthread_mutex_unlock( &tls_mutex); + return TRUE; + } + + pthread_mutex_unlock( &tls_mutex); + return FALSE; } -BOOL TlsSetValue( DWORD index, PVOID val) -{ - // verify if memory has been allocated for this thread - if (*tls_storage == NULL) { - // allocate memory for indexes - *tls_storage = (ULONG)calloc( TLS_MINIMUM_AVAILABLE, sizeof(int)); - //fprintf( stderr, "tid#%d, tls_storage %x\n", _threadid, *tls_storage); - } +PVOID TlsGetValue( DWORD index) +{ + if (index >= TLS_MINIMUM_AVAILABLE) + return NULL; + + /* verify if memory has been allocated for this thread */ + if (*tls_storage == NULL) + { + /* allocate memory for indexes */ + *tls_storage = (ULONG)calloc( TLS_MINIMUM_AVAILABLE, sizeof(int)); + /* fprintf(stderr, "tid#%d, tls_storage %x\n", _threadid, *tls_storage); */ + } + + ULONG* tls_array = (ULONG*) *tls_storage; + return (PVOID) tls_array[index]; +} - if (index >= TLS_MINIMUM_AVAILABLE) - return FALSE; - ULONG* tls_array = (ULONG*) *tls_storage; - //fprintf( stderr, "tid#%d, TlsSetValue array %08x index %d -> %08x (old)\n", _threadid, tls_array, index, tls_array[ index]); - tls_array[ index] = (ULONG) val; - //fprintf( stderr, "tid#%d, TlsSetValue array %08x index %d -> %08x\n", _threadid, tls_array, index, val); +BOOL TlsSetValue( DWORD index, PVOID val) +{ - return TRUE; + /* verify if memory has been allocated for this thread */ + if (*tls_storage == NULL) + { + /* allocate memory for indexes */ + *tls_storage = (ULONG)calloc( TLS_MINIMUM_AVAILABLE, sizeof(int)); + /* fprintf(stderr, "tid#%d, tls_storage %x\n", _threadid, *tls_storage); */ + } + + if (index >= TLS_MINIMUM_AVAILABLE) + return FALSE; + + ULONG* tls_array = (ULONG*) *tls_storage; + /* fprintf( stderr, "tid#%d, TlsSetValue array %08x index %d -> %08x (old)\n", _threadid, tls_array, index, tls_array[ index]); */ + tls_array[ index] = (ULONG) val; + /* fprintf( stderr, "tid#%d, TlsSetValue array %08x index %d -> %08x\n", _threadid, tls_array, index, val); */ + return TRUE; } diff --git a/mysys/my_pthread.c b/mysys/my_pthread.c index 07e8ecec6ac..0de7041fae7 100644 --- a/mysys/my_pthread.c +++ b/mysys/my_pthread.c @@ -425,6 +425,19 @@ int my_pthread_cond_init(pthread_cond_t *mp, const pthread_condattr_t *attr) #endif +#ifdef __NETWARE__ +/* NetWare does not re-acquire the lock if the condition fails */ +int my_pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, + struct timespec *abstime) +{ + int err= pthread_cond_timedwait(cond, mutex, abstime); + if (err) + pthread_mutex_lock(mutex); + return err; +} +#endif /* __NETWARE__ */ + + /***************************************************************************** Patches for HPUX We need these because the pthread_mutex.. code returns -1 on error, diff --git a/mysys/my_redel.c b/mysys/my_redel.c index b5a79d9454b..9ba03cd9526 100644 --- a/mysys/my_redel.c +++ b/mysys/my_redel.c @@ -90,7 +90,7 @@ int my_copystat(const char *from, const char *to, int MyFlags) return 1; VOID(chmod(to, statbuf.st_mode & 07777)); /* Copy modes */ -#if !defined(MSDOS) && !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) +#if !defined(MSDOS) && !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) && !defined(__NETWARE__) if (statbuf.st_nlink > 1 && MyFlags & MY_LINK_WARNING) { if (MyFlags & MY_LINK_WARNING) diff --git a/mysys/mf_sleep.c b/mysys/my_sleep.c index 49db465e7c5..3de2d2abd13 100644 --- a/mysys/mf_sleep.c +++ b/mysys/my_sleep.c @@ -14,22 +14,25 @@ along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ -/* Wait a given time (On systems that dont have sleep !!; MSDOS) */ +/* Wait a given number of microseconds */ #include "mysys_priv.h" #include <m_string.h> -#ifdef _MSC_VER - -void sleep(sec) -int sec; +void my_sleep(ulong m_seconds) { - ulong start; - DBUG_ENTER("sleep"); - - start=(ulong) time((time_t*) 0); +#ifdef __NETWARE__ + delay(m_seconds/1000+1); +#elif defined(OS2) + DosSleep(m_seconds/1000+1); +#elif defined(HAVE_SELECT) + struct timeval t; + t.tv_sec= m_seconds / 1000000L; + t.tv_usec= m_seconds % 1000000L; + select(0,0,0,0,&t); /* sleep */ +#else + uint sec= (uint) (m_seconds / 1000000L); + ulong start= (ulong) time((time_t*) 0); while ((ulong) time((time_t*) 0) < start+sec); - DBUG_VOID_RETURN; -} /* sleep */ - -#endif /* MSDOS */ +#endif +} diff --git a/mysys/my_tempnam.c b/mysys/my_tempnam.c index 4fa2dd2abc4..a652fae3574 100644 --- a/mysys/my_tempnam.c +++ b/mysys/my_tempnam.c @@ -38,7 +38,7 @@ #endif #ifdef HAVE_TEMPNAM -#if !defined( MSDOS) && !defined(OS2) +#if !defined( MSDOS) && !defined(OS2) && !defined(__NETWARE__) extern char **environ; #endif #endif @@ -104,14 +104,14 @@ my_string my_tempnam(const char *dir, const char *pfx, dir=temp; } #ifdef OS2 - // changing environ variable doesn't work with VACPP + /* changing environ variable doesn't work with VACPP */ char buffer[256]; sprintf( buffer, "TMP=%s", dir); - // remove ending backslash + /* remove ending backslash */ if (buffer[strlen(buffer)-1] == '\\') buffer[strlen(buffer)-1] = '\0'; putenv( buffer); -#else +#elif !defined(__NETWARE__) old_env=(char**)environ; if (dir) { /* Don't use TMPDIR if dir is given */ @@ -120,7 +120,7 @@ my_string my_tempnam(const char *dir, const char *pfx, } #endif res=tempnam((char*) dir,(my_string) pfx); /* Use stand. dir with prefix */ -#ifndef OS2 +#if !defined(OS2) && !defined(__NETWARE__) ((char**) environ)=(char**) old_env; #endif if (!res) diff --git a/mysys/my_thr_init.c b/mysys/my_thr_init.c index 45c10e5a7b6..59466083b28 100644 --- a/mysys/my_thr_init.c +++ b/mysys/my_thr_init.c @@ -94,6 +94,18 @@ void my_thread_global_end(void) #ifdef PPTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP pthread_mutexattr_destroy(&my_errchk_mutexattr); #endif + pthread_mutex_destroy(&THR_LOCK_malloc); + pthread_mutex_destroy(&THR_LOCK_open); + pthread_mutex_destroy(&THR_LOCK_keycache); + pthread_mutex_destroy(&THR_LOCK_lock); + pthread_mutex_destroy(&THR_LOCK_isam); + pthread_mutex_destroy(&THR_LOCK_myisam); + pthread_mutex_destroy(&THR_LOCK_heap); + pthread_mutex_destroy(&THR_LOCK_net); + pthread_mutex_destroy(&THR_LOCK_charset); +#ifndef HAVE_LOCALTIME_R + pthread_mutex_destroy(&LOCK_localtime_r); +#endif #ifndef HAVE_GETHOSTBYNAME_R pthread_mutex_destroy(&LOCK_gethostbyname_r); #endif diff --git a/mysys/mysys_priv.h b/mysys/mysys_priv.h index 75d77ed9987..f79431a0b0b 100644 --- a/mysys/mysys_priv.h +++ b/mysys/mysys_priv.h @@ -23,9 +23,9 @@ #ifdef THREAD #include <my_pthread.h> -extern pthread_mutex_t THR_LOCK_malloc,THR_LOCK_open,THR_LOCK_keycache, - THR_LOCK_lock,THR_LOCK_isam,THR_LOCK_net,THR_LOCK_charset; -extern pthread_mutex_t LOCK_bitmap; +extern pthread_mutex_t THR_LOCK_malloc, THR_LOCK_open, THR_LOCK_keycache; +extern pthread_mutex_t THR_LOCK_lock, THR_LOCK_isam, THR_LOCK_net; +extern pthread_mutex_t THR_LOCK_charset; #else #include <my_no_pthread.h> #endif diff --git a/mysys/safemalloc.c b/mysys/safemalloc.c index 89079fba31c..9cbb178edb4 100644 --- a/mysys/safemalloc.c +++ b/mysys/safemalloc.c @@ -239,8 +239,8 @@ gptr _myrealloc (register gptr pPtr, register uint uSize, if (*((long*) ((char*) &pRec -> lSpecialValue+sf_malloc_prehunc)) != MAGICKEY) { - fprintf (stderr, "Reallocating unallocated data at line %d, '%s'\n", - uLine, sFile); + fprintf(stderr, "Error: Reallocating unallocated data at line %d, '%s'\n", + uLine, sFile); DBUG_PRINT("safe",("Reallocating unallocated data at line %d, '%s'", uLine, sFile)); (void) fflush(stderr); @@ -295,8 +295,8 @@ void _myfree (gptr pPtr, const char *sFile, uint uLine, myf myflags) if (*((long*) ((char*) &pRec -> lSpecialValue+sf_malloc_prehunc)) != MAGICKEY) { - fprintf (stderr, "Freeing unallocated data at line %d, '%s'\n", - uLine, sFile); + fprintf(stderr, "Error: Freeing unallocated data at line %d, '%s'\n", + uLine, sFile); DBUG_PRINT("safe",("Unallocated data at line %d, '%s'",uLine,sFile)); (void) fflush(stderr); DBUG_VOID_RETURN; @@ -336,8 +336,8 @@ static int check_ptr(const char *where, byte *ptr, const char *sFile, { if (!ptr) { - fprintf (stderr, "%s NULL pointer at line %d, '%s'\n", - where,uLine, sFile); + fprintf(stderr, "Error: %s NULL pointer at line %d, '%s'\n", + where,uLine, sFile); DBUG_PRINT("safe",("Null pointer at line %d '%s'", uLine, sFile)); (void) fflush(stderr); return 1; @@ -345,8 +345,8 @@ static int check_ptr(const char *where, byte *ptr, const char *sFile, #ifndef _MSC_VER if ((long) ptr & (ALIGN_SIZE(1)-1)) { - fprintf (stderr, "%s wrong aligned pointer at line %d, '%s'\n", - where,uLine, sFile); + fprintf(stderr, "Error: %s wrong aligned pointer at line %d, '%s'\n", + where,uLine, sFile); DBUG_PRINT("safe",("Wrong aligned pointer at line %d, '%s'", uLine,sFile)); (void) fflush(stderr); @@ -355,8 +355,8 @@ static int check_ptr(const char *where, byte *ptr, const char *sFile, #endif if (ptr < sf_min_adress || ptr > sf_max_adress) { - fprintf (stderr, "%s pointer out of range at line %d, '%s'\n", - where,uLine, sFile); + fprintf(stderr, "Error: %s pointer out of range at line %d, '%s'\n", + where,uLine, sFile); DBUG_PRINT("safe",("Pointer out of range at line %d '%s'", uLine,sFile)); (void) fflush(stderr); @@ -388,7 +388,7 @@ void TERMINATE (FILE *file) { if (file) { - fprintf (file, "cNewCount: %d\n", cNewCount); + fprintf(file, "Warning: Not freed memory segments: %d\n", cNewCount); (void) fflush(file); } DBUG_PRINT("safe",("cNewCount: %d",cNewCount)); @@ -403,7 +403,7 @@ void TERMINATE (FILE *file) { if (file) { - fprintf(file, "Memory that was not free'ed (%ld bytes):\n",lCurMemory); + fprintf(file, "Warning: Memory that was not free'ed (%ld bytes):\n",lCurMemory); (void) fflush(file); } DBUG_PRINT("safe",("Memory that was not free'ed (%ld bytes):",lCurMemory)); @@ -411,11 +411,11 @@ void TERMINATE (FILE *file) { if (file) { - fprintf (file, - "\t%6u bytes at 0x%09lx, allocated at line %4u in '%s'", - pPtr -> uDataSize, - (ulong) &(pPtr -> aData[sf_malloc_prehunc]), - pPtr -> uLineNum, pPtr -> sFileName); + fprintf(file, + "\t%6u bytes at 0x%09lx, allocated at line %4u in '%s'", + pPtr -> uDataSize, + (ulong) &(pPtr -> aData[sf_malloc_prehunc]), + pPtr -> uLineNum, pPtr -> sFileName); fprintf(file, "\n"); (void) fflush(file); } @@ -429,8 +429,8 @@ void TERMINATE (FILE *file) /* Report the memory usage statistics */ if (file) { - fprintf (file, "Maximum memory usage: %ld bytes (%ldk)\n", - lMaxMemory, (lMaxMemory + 1023L) / 1024L); + fprintf(file, "Maximum memory usage: %ld bytes (%ldk)\n", + lMaxMemory, (lMaxMemory + 1023L) / 1024L); (void) fflush(file); } DBUG_PRINT("safe",("Maximum memory usage: %ld bytes (%ldk)", @@ -453,9 +453,9 @@ static int _checkchunk (register struct remember *pRec, const char *sFile, if (*((long*) ((char*) &pRec -> lSpecialValue+sf_malloc_prehunc)) != MAGICKEY) { - fprintf (stderr, "Memory allocated at %s:%d was underrun,", - pRec -> sFileName, pRec -> uLineNum); - fprintf (stderr, " discovered at %s:%d\n", sFile, uLine); + fprintf(stderr, "Error: Memory allocated at %s:%d was underrun,", + pRec -> sFileName, pRec -> uLineNum); + fprintf(stderr, " discovered at %s:%d\n", sFile, uLine); (void) fflush(stderr); DBUG_PRINT("safe",("Underrun at %lx, allocated at %s:%d", &(pRec -> aData[sf_malloc_prehunc]), @@ -472,9 +472,9 @@ static int _checkchunk (register struct remember *pRec, const char *sFile, *magicp++ != MAGICEND2 || *magicp++ != MAGICEND3) { - fprintf (stderr, "Memory allocated at %s:%d was overrun,", - pRec -> sFileName, pRec -> uLineNum); - fprintf (stderr, " discovered at '%s:%d'\n", sFile, uLine); + fprintf(stderr, "Error: Memory allocated at %s:%d was overrun,", + pRec -> sFileName, pRec -> uLineNum); + fprintf(stderr, " discovered at '%s:%d'\n", sFile, uLine); (void) fflush(stderr); DBUG_PRINT("safe",("Overrun at %lx, allocated at %s:%d", &(pRec -> aData[sf_malloc_prehunc]), @@ -505,9 +505,9 @@ int _sanity (const char *sFile, uint uLine) pthread_mutex_unlock(&THR_LOCK_malloc); if (count || pTmp) { - const char *format="Safemalloc link list destroyed, discovered at '%s:%d'"; - fprintf (stderr, format, sFile, uLine); fputc('\n',stderr); - fprintf (stderr, "root=%p,count=%d,pTmp=%p\n", pRememberRoot,count,pTmp); + const char *format="Error: Safemalloc link list destroyed, discovered at '%s:%d'"; + fprintf(stderr, format, sFile, uLine); fputc('\n',stderr); + fprintf(stderr, "root=%p,count=%d,pTmp=%p\n", pRememberRoot,count,pTmp); (void) fflush(stderr); DBUG_PRINT("safe",(format, sFile, uLine)); flag=1; diff --git a/mysys/thr_alarm.c b/mysys/thr_alarm.c index ed468b5ef50..6697b9d3360 100644 --- a/mysys/thr_alarm.c +++ b/mysys/thr_alarm.c @@ -229,8 +229,13 @@ void thr_end_alarm(thr_alarm_t *alarmed) (long) *alarmed)); } if (alarm_aborted && !alarm_queue.elements) + { delete_queue(&alarm_queue); - pthread_mutex_unlock(&LOCK_alarm); + pthread_mutex_unlock(&LOCK_alarm); + pthread_mutex_destroy(&LOCK_alarm); + } + else + pthread_mutex_unlock(&LOCK_alarm); pthread_sigmask(SIG_SETMASK,&old_mask,NULL); DBUG_VOID_RETURN; } @@ -367,19 +372,25 @@ static sig_handler process_alarm_part2(int sig __attribute__((unused))) void end_thr_alarm(void) { DBUG_ENTER("end_thr_alarm"); - pthread_mutex_lock(&LOCK_alarm); if (!alarm_aborted) - { + { + my_bool deleted=0; + pthread_mutex_lock(&LOCK_alarm); DBUG_PRINT("info",("Resheduling %d waiting alarms",alarm_queue.elements)); alarm_aborted=1; /* mark aborted */ if (!alarm_queue.elements) + { + deleted= 1; delete_queue(&alarm_queue); + } if (pthread_equal(pthread_self(),alarm_thread)) alarm(1); /* Shut down everything soon */ else reschedule_alarms(); + pthread_mutex_unlock(&LOCK_alarm); + if (deleted) + pthread_mutex_destroy(&LOCK_alarm); } - pthread_mutex_unlock(&LOCK_alarm); DBUG_VOID_RETURN; } diff --git a/mysys/thr_mutex.c b/mysys/thr_mutex.c index 6de96f0a24a..2aabe2f500a 100644 --- a/mysys/thr_mutex.c +++ b/mysys/thr_mutex.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -20,13 +20,15 @@ #if defined(HAVE_LINUXTHREADS) && !defined (__USE_UNIX98) #define __USE_UNIX98 /* To get rw locks under Linux */ #endif -#include <m_string.h> #if defined(THREAD) && defined(SAFE_MUTEX) #undef SAFE_MUTEX /* Avoid safe_mutex redefinitions */ -#include <my_pthread.h> +#include "mysys_priv.h" +#include "my_static.h" +#include <m_string.h> #ifndef DO_NOT_REMOVE_THREAD_WRAPPERS /* Remove wrappers */ +#undef pthread_mutex_t #undef pthread_mutex_init #undef pthread_mutex_lock #undef pthread_mutex_unlock @@ -38,15 +40,55 @@ #endif #endif /* DO_NOT_REMOVE_THREAD_WRAPPERS */ +static pthread_mutex_t THR_LOCK_mutex; +static ulong safe_mutex_count= 0; /* Number of mutexes created */ +#ifdef SAFE_MUTEX_DETECT_DESTROY +static struct st_safe_mutex_info_t *safe_mutex_root= NULL; +#endif + +void safe_mutex_global_init(void) +{ + pthread_mutex_init(&THR_LOCK_mutex,MY_MUTEX_INIT_FAST); +} + + int safe_mutex_init(safe_mutex_t *mp, - const pthread_mutexattr_t *attr __attribute__((unused))) + const pthread_mutexattr_t *attr __attribute__((unused)), + const char *file __attribute__((unused)), + uint line __attribute__((unused))) { bzero((char*) mp,sizeof(*mp)); pthread_mutex_init(&mp->global,MY_MUTEX_INIT_ERRCHK); pthread_mutex_init(&mp->mutex,attr); + +#ifdef SAFE_MUTEX_DETECT_DESTROY + /* + Monitor the freeing of mutexes. This code depends on single thread init + and destroy + */ + if ((mp->info= (safe_mutex_info_t *) malloc(sizeof(safe_mutex_info_t)))) + { + struct st_safe_mutex_info_t *info =mp->info; + + info->init_file= (char *) file; + info->init_line= line; + info->prev= NULL; + info->next= NULL; + + pthread_mutex_lock(&THR_LOCK_mutex); + if ((info->next= safe_mutex_root)) + safe_mutex_root->prev= info; + safe_mutex_root= info; + safe_mutex_count++; + pthread_mutex_unlock(&THR_LOCK_mutex); + } +#else + thread_safe_increment(safe_mutex_count, &THR_LOCK_mutex); +#endif /* SAFE_MUTEX_DETECT_DESTROY */ return 0; } + int safe_mutex_lock(safe_mutex_t *mp,const char *file, uint line) { int error; @@ -199,6 +241,11 @@ int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp, fflush(stderr); abort(); } +#ifdef __NETWARE__ + /* NetWare doesn't re-acquire the mutex on an error */ + if (error && pthread_mutex_lock(&mp->mutex)) + mp->count--; +#endif /* __NETWARE__ */ mp->thread=pthread_self(); mp->file= (char*) file; mp->line=line; @@ -206,6 +253,7 @@ int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp, return error; } + int safe_mutex_destroy(safe_mutex_t *mp, const char *file, uint line) { int error=0; @@ -225,7 +273,70 @@ int safe_mutex_destroy(safe_mutex_t *mp, const char *file, uint line) if (pthread_mutex_destroy(&mp->mutex)) error=1; #endif + +#ifdef SAFE_MUTEX_DETECT_DESTROY + if (mp->info) + { + struct st_safe_mutex_info_t *info= mp->info; + pthread_mutex_lock(&THR_LOCK_mutex); + + if (info->prev) + info->prev->next = info->next; + else + safe_mutex_root = info->next; + if (info->next) + info->next->prev = info->prev; + safe_mutex_count--; + + pthread_mutex_unlock(&THR_LOCK_mutex); + free(info); + mp->info= NULL; /* Get crash if double free */ + } +#else + thread_safe_sub(safe_mutex_count, 1, &THR_LOCK_mutex); +#endif /* SAFE_MUTEX_DETECT_DESTROY */ return error; } + +/* + Free global resources and check that all mutex has been destroyed + + SYNOPSIS + safe_mutex_end() + file Print errors on this file + + NOTES + We can't use DBUG_PRINT() here as we have in my_end() disabled + DBUG handling before calling this function. + + In MySQL one may get one warning for a mutex created in my_thr_init.c + This is ok, as this thread may not yet have been exited. +*/ + +void safe_mutex_end(FILE *file __attribute__((unused))) +{ + if (!safe_mutex_count) /* safetly */ + pthread_mutex_destroy(&THR_LOCK_mutex); +#ifdef SAFE_MUTEX_DETECT_DESTROY + if (!file) + return; + + if (safe_mutex_count) + { + fprintf(file, "Warning: Not destroyed mutex: %lu\n", safe_mutex_count); + (void) fflush(file); + } + { + struct st_safe_mutex_info_t *ptr; + for (ptr= safe_mutex_root ; ptr ; ptr= ptr->next) + { + fprintf(file, "\tMutex initiated at line %4u in '%s'\n", + ptr->init_line, ptr->init_file); + (void) fflush(file); + } + } +#endif /* SAFE_MUTEX_DETECT_DESTROY */ +} + #endif /* THREAD && SAFE_MUTEX */ diff --git a/netware/Makefile.am b/netware/Makefile.am new file mode 100644 index 00000000000..bfa87f25770 --- /dev/null +++ b/netware/Makefile.am @@ -0,0 +1,28 @@ +# Copyright (c) 2002 Novell, Inc. All Rights Reserved. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +if PLATFORM_NETWARE +INCLUDES = -I$(srcdir)/../include -I../include -I.. +bin_PROGRAMS = mysqld_safe mysql_install_db mysql_test_run libmysql +mysqld_safe_SOURCES= mysqld_safe.c my_manage.c +mysql_install_db_SOURCES= mysql_install_db.c my_manage.c +mysql_test_run_SOURCES= mysql_test_run.c my_manage.c +libmysql_SOURCES= libmysqlmain.c +libmysql_LDADD = ../libmysql/.libs/libmysqlclient.a +endif + +# Don't update the files from bitkeeper +%::SCCS/s.% diff --git a/netware/init_db.sql b/netware/init_db.sql new file mode 100644 index 00000000000..640fe3a4188 --- /dev/null +++ b/netware/init_db.sql @@ -0,0 +1,22 @@ +USE mysql; + +CREATE TABLE db (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Select_priv enum('N','Y') DEFAULT 'N' NOT NULL, Insert_priv enum('N','Y') DEFAULT 'N' NOT NULL, Update_priv enum('N','Y') DEFAULT 'N' NOT NULL, Delete_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_priv enum('N','Y') DEFAULT 'N' NOT NULL, Drop_priv enum('N','Y') DEFAULT 'N' NOT NULL, Grant_priv enum('N','Y') DEFAULT 'N' NOT NULL, References_priv enum('N','Y') DEFAULT 'N' NOT NULL, Index_priv enum('N','Y') DEFAULT 'N' NOT NULL, Alter_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_tmp_table_priv enum('N','Y') DEFAULT 'N' NOT NULL, Lock_tables_priv enum('N','Y') DEFAULT 'N' NOT NULL, PRIMARY KEY Host (Host,Db,User), KEY User (User)) comment='Database privileges'; + +INSERT INTO db VALUES ('%','test','','Y','Y','Y','Y','Y','Y','N','Y','Y','Y','Y','Y'); +INSERT INTO db VALUES ('%','test\_%','','Y','Y','Y','Y','Y','Y','N','Y','Y','Y','Y','Y'); + +CREATE TABLE host (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, Select_priv enum('N','Y') DEFAULT 'N' NOT NULL, Insert_priv enum('N','Y') DEFAULT 'N' NOT NULL, Update_priv enum('N','Y') DEFAULT 'N' NOT NULL, Delete_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_priv enum('N','Y') DEFAULT 'N' NOT NULL, Drop_priv enum('N','Y') DEFAULT 'N' NOT NULL, Grant_priv enum('N','Y') DEFAULT 'N' NOT NULL, References_priv enum('N','Y') DEFAULT 'N' NOT NULL, Index_priv enum('N','Y') DEFAULT 'N' NOT NULL, Alter_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_tmp_table_priv enum('N','Y') DEFAULT 'N' NOT NULL, Lock_tables_priv enum('N','Y') DEFAULT 'N' NOT NULL, PRIMARY KEY Host (Host,Db)) comment='Host privileges; Merged with database privileges'; + +CREATE TABLE user (Host char(60) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Password char(16) binary DEFAULT '' NOT NULL, Select_priv enum('N','Y') DEFAULT 'N' NOT NULL, Insert_priv enum('N','Y') DEFAULT 'N' NOT NULL, Update_priv enum('N','Y') DEFAULT 'N' NOT NULL, Delete_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_priv enum('N','Y') DEFAULT 'N' NOT NULL, Drop_priv enum('N','Y') DEFAULT 'N' NOT NULL, Reload_priv enum('N','Y') DEFAULT 'N' NOT NULL, Shutdown_priv enum('N','Y') DEFAULT 'N' NOT NULL, Process_priv enum('N','Y') DEFAULT 'N' NOT NULL, File_priv enum('N','Y') DEFAULT 'N' NOT NULL, Grant_priv enum('N','Y') DEFAULT 'N' NOT NULL, References_priv enum('N','Y') DEFAULT 'N' NOT NULL, Index_priv enum('N','Y') DEFAULT 'N' NOT NULL, Alter_priv enum('N','Y') DEFAULT 'N' NOT NULL, Show_db_priv enum('N','Y') DEFAULT 'N' NOT NULL, Super_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_tmp_table_priv enum('N','Y') DEFAULT 'N' NOT NULL, Lock_tables_priv enum('N','Y') DEFAULT 'N' NOT NULL, Execute_priv enum('N','Y') DEFAULT 'N' NOT NULL, Repl_slave_priv enum('N','Y') DEFAULT 'N' NOT NULL, Repl_client_priv enum('N','Y') DEFAULT 'N' NOT NULL, ssl_type enum('','ANY','X509', 'SPECIFIED') DEFAULT '' NOT NULL, ssl_cipher BLOB NOT NULL, x509_issuer BLOB NOT NULL, x509_subject BLOB NOT NULL, max_questions int(11) unsigned DEFAULT 0 NOT NULL, max_updates int(11) unsigned DEFAULT 0 NOT NULL, max_connections int(11) unsigned DEFAULT 0 NOT NULL, PRIMARY KEY Host (Host,User)) comment='Users and global privileges'; + +INSERT INTO user VALUES ('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0); +INSERT INTO user VALUES ('%','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0); + +INSERT INTO user (host,user) values ('localhost',''); +INSERT INTO user (host,user) values ('%',''); + +CREATE TABLE func (name char(64) binary DEFAULT '' NOT NULL, ret tinyint(1) DEFAULT '0' NOT NULL, dl char(128) DEFAULT '' NOT NULL, type enum ('function','aggregate') NOT NULL, PRIMARY KEY (name)) comment='User defined functions'; + +CREATE TABLE tables_priv (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Table_name char(60) binary DEFAULT '' NOT NULL, Grantor char(77) DEFAULT '' NOT NULL, Timestamp timestamp(14), Table_priv set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter') DEFAULT '' NOT NULL, Column_priv set('Select','Insert','Update','References') DEFAULT '' NOT NULL, PRIMARY KEY (Host,Db,User,Table_name), KEY Grantor (Grantor)) comment='Table privileges'; + +CREATE TABLE columns_priv (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Table_name char(64) binary DEFAULT '' NOT NULL, Column_name char(64) binary DEFAULT '' NOT NULL, Timestamp timestamp(14), Column_priv set('Select','Insert','Update','References') DEFAULT '' NOT NULL, PRIMARY KEY (Host,Db,User,Table_name,Column_name)) comment='Column privileges'; diff --git a/netware/install_test_db.ncf b/netware/install_test_db.ncf new file mode 100644 index 00000000000..06befc5d9bd --- /dev/null +++ b/netware/install_test_db.ncf @@ -0,0 +1 @@ +# This functionality is handled by mysql-test-run.nlm on NetWare diff --git a/netware/libmysql.imp b/netware/libmysql.imp new file mode 100644 index 00000000000..75fcc8d1a99 --- /dev/null +++ b/netware/libmysql.imp @@ -0,0 +1,85 @@ +myodbc_remove_escape,
+mysql_add_slave,
+mysql_affected_rows,
+mysql_change_user,
+mysql_character_set_name,
+mysql_close,
+mysql_data_seek,
+mysql_debug,
+mysql_disable_reads_from_master,
+mysql_disable_rpl_parse,
+mysql_dump_debug_info,
+mysql_enable_reads_from_master,
+mysql_enable_rpl_parse,
+mysql_eof,
+mysql_errno,
+mysql_error,
+mysql_escape_string,
+mysql_fetch_field,
+mysql_fetch_field_direct,
+mysql_fetch_fields,
+mysql_fetch_lengths,
+mysql_fetch_row,
+mysql_field_count,
+mysql_field_seek,
+mysql_field_tell,
+mysql_free_result,
+mysql_get_client_info,
+mysql_get_host_info,
+mysql_get_proto_info,
+mysql_get_server_info,
+mysql_info,
+mysql_init,
+mysql_insert_id,
+mysql_kill,
+mysql_list_dbs,
+mysql_list_fields,
+mysql_list_processes,
+mysql_list_tables,
+mysql_manager_close,
+mysql_manager_command,
+mysql_manager_connect,
+mysql_manager_fetch_line,
+mysql_manager_init,
+mysql_master_query,
+mysql_master_send_query,
+mysql_num_fields,
+mysql_num_rows,
+mysql_odbc_escape_string,
+mysql_options,
+mysql_ping,
+mysql_query,
+mysql_read_query_result,
+mysql_reads_from_master_enabled,
+mysql_real_connect,
+mysql_real_escape_string,
+mysql_real_query,
+mysql_refresh,
+mysql_row_seek,
+mysql_row_tell,
+mysql_rpl_parse_enabled,
+mysql_rpl_probe,
+mysql_rpl_query_type,
+mysql_select_db,
+mysql_send_query,
+mysql_server_end,
+mysql_server_init,
+mysql_set_master,
+mysql_shutdown,
+mysql_slave_query,
+mysql_slave_send_query,
+mysql_ssl_set,
+mysql_stat,
+mysql_store_result,
+mysql_thread_end,
+mysql_thread_id,
+mysql_thread_init,
+mysql_thread_safe,
+mysql_use_result,
+net_safe_read,
+simple_command,
+mysql_connect,
+mysql_create_db,
+mysql_drop_db,
+
+
diff --git a/netware/libmysqlmain.c b/netware/libmysqlmain.c new file mode 100644 index 00000000000..03fdb832176 --- /dev/null +++ b/netware/libmysqlmain.c @@ -0,0 +1,38 @@ +/* + Copyright (c) 2002 Novell, Inc. All Rights Reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include "my_global.h" + +my_bool init_available_charsets(myf myflags); + +/* this function is required so that global memory is allocated against this +library nlm, and not against a paticular client */ +int _NonAppStart(void *NLMHandle, void *errorScreen, const char *commandLine, + const char *loadDirPath, size_t uninitializedDataLength, + void *NLMFileHandle, int (*readRoutineP)( int conn, void *fileHandle, + size_t offset, size_t nbytes, size_t *bytesRead, void *buffer ), + size_t customDataOffset, size_t customDataSize, int messageCount, + const char **messages) +{ + mysql_server_init(0, NULL, NULL); + + init_available_charsets(MYF(0)); + + return 0; +} + diff --git a/netware/my_manage.c b/netware/my_manage.c new file mode 100644 index 00000000000..25147b16674 --- /dev/null +++ b/netware/my_manage.c @@ -0,0 +1,477 @@ +/* + Copyright (c) 2003 Novell, Inc. All Rights Reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include <stdio.h> +#include <errno.h> +#include <dirent.h> +#include <string.h> +#include <screen.h> +#include <nks/vm.h> +#include <ctype.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <assert.h> + +#include "my_manage.h" + +/****************************************************************************** + + macros + +******************************************************************************/ + +/****************************************************************************** + + global variables + +******************************************************************************/ + +/****************************************************************************** + + functions + +******************************************************************************/ + +/****************************************************************************** + + init_args() + + Init an argument list. + +******************************************************************************/ +void _init_args(arg_list *al) +{ + int i; + + *al = malloc(sizeof(arg_list_t)); + + (*al)->argc = 0; + + for(i = 0; i < ARG_MAX; i++) + { + (*al)->argv[i] = NULL; + } +} + +/****************************************************************************** + + add_arg() + + Add an argument to a list. + +******************************************************************************/ +void add_arg(arg_list al, char *format, ...) +{ + va_list ap; + + ASSERT(al != NULL); + ASSERT(al->argc < ARG_MAX); + + al->argv[al->argc] = malloc(PATH_MAX); + + ASSERT(al->argv[al->argc] != NULL); + + va_start(ap, format); + + vsprintf(al->argv[al->argc], format, ap); + + va_end(ap); + + ++(al->argc); +} + +/****************************************************************************** + + _free_args() + + Free an argument list. + +******************************************************************************/ +void _free_args(arg_list *al) +{ + int i; + + ASSERT(al != NULL); + ASSERT(*al != NULL); + + for(i = 0; i < (*al)->argc; i++) + { + ASSERT((*al)->argv[i] != NULL); + free((*al)->argv[i]); + (*al)->argv[i] = NULL; + } + + free(*al); + *al = NULL; +} + +/****************************************************************************** + + sleep_until_file_deleted() + + Sleep until the given file is no longer found. + +******************************************************************************/ +int sleep_until_file_deleted(char *pid_file) +{ + struct stat buf; + int i, err; + + for(i = 0; (i < TRY_MAX) && (err = !stat(pid_file, &buf)); i++) sleep(1); + + if (err != 0) err = errno; + + return err; +} + +/****************************************************************************** + + sleep_until_file_exists() + + Sleep until the given file exists. + +******************************************************************************/ +int sleep_until_file_exists(char *pid_file) +{ + struct stat buf; + int i, err; + + for(i = 0; (i < TRY_MAX) && (err = stat(pid_file, &buf)); i++) sleep(1); + + if (err != 0) err = errno; + + return err; +} + +/****************************************************************************** + + wait_for_server_start() + + Wait for the server on the given port to start. + +******************************************************************************/ +int wait_for_server_start(char *bin_dir, char *user, char *password, int port) +{ + arg_list al; + int err, i; + char mysqladmin_file[PATH_MAX]; + char trash[PATH_MAX]; + + // mysqladmin file + snprintf(mysqladmin_file, PATH_MAX, "%s/mysqladmin", bin_dir); + snprintf(trash, PATH_MAX, "/tmp/trash.out"); + + // args + init_args(al); + add_arg(al, "%s", mysqladmin_file); + add_arg(al, "--no-defaults"); + add_arg(al, "--port=%u", port); + add_arg(al, "--user=%s", user); + add_arg(al, "--password=%s", password); + add_arg(al, "--silent"); + add_arg(al, "-O"); + add_arg(al, "connect_timeout=10"); + add_arg(al, "-w"); + add_arg(al, "--host=localhost"); + add_arg(al, "ping"); + + // NetWare does not support the connect timeout in the TCP/IP stack + // -- we will try the ping multiple times + for(i = 0; (i < TRY_MAX) + && (err = spawn(mysqladmin_file, al, TRUE, NULL, + trash, NULL)); i++) sleep(1); + + // free args + free_args(al); + + return err; +} + +/****************************************************************************** + + spawn() + + Spawn the given file with the given arguments. + +******************************************************************************/ +int spawn(char *file, arg_list al, int join, char *input, + char *output, char *error) +{ + NXNameSpec_t name; + NXExecEnvSpec_t env; + NXVmId_t vm, ignore; + int result; + + // name + name.ssType = NX_OBJ_FILE; + name.ssPathCtx = 0; + name.ssPath = file; + + // env + env.esArgc = al->argc; + env.esArgv = al->argv; + env.esEnv = NULL; + + env.esStdin.ssPathCtx = 0; + env.esStdout.ssPathCtx = 0; + env.esStderr.ssPathCtx = 0; + + if (input == NULL) + { + env.esStdin.ssType = NX_OBJ_DEFAULT; + env.esStdin.ssPath = NULL; + } + else + { + env.esStdin.ssType = NX_OBJ_FILE; + env.esStdin.ssPath = input; + } + + if (output == NULL) + { + env.esStdout.ssType = NX_OBJ_DEFAULT; + env.esStdout.ssPath = NULL; + } + else + { + env.esStdout.ssType = NX_OBJ_FILE; + env.esStdout.ssPath = output; + } + + if (error == NULL) + { + env.esStderr.ssType = NX_OBJ_DEFAULT; + env.esStderr.ssPath = NULL; + } + else + { + env.esStderr.ssType = NX_OBJ_FILE; + env.esStderr.ssPath = error; + } + + result = NXVmSpawn(&name, &env, NX_VM_SAME_ADDRSPACE | NX_VM_INHERIT_ENV, &vm); + + if (!result && join) + { + NXVmJoin(vm, &ignore, &result); + } + + return result; +} + +/****************************************************************************** + + stop_server() + + Stop the server with the given port and pid file. + +******************************************************************************/ +int stop_server(char *bin_dir, char *user, char *password, int port, + char *pid_file) +{ + arg_list al; + int err, i, argc = 0; + char mysqladmin_file[PATH_MAX]; + char trash[PATH_MAX]; + + // mysqladmin file + snprintf(mysqladmin_file, PATH_MAX, "%s/mysqladmin", bin_dir); + snprintf(trash, PATH_MAX, "/tmp/trash.out"); + + // args + init_args(al); + add_arg(al, "%s", mysqladmin_file); + add_arg(al, "--no-defaults"); + add_arg(al, "--port=%u", port); + add_arg(al, "--user=%s", user); + add_arg(al, "--password=%s", password); + add_arg(al, "-O"); + add_arg(al, "shutdown_timeout=20"); + add_arg(al, "shutdown"); + + // spawn + if ((err = spawn(mysqladmin_file, al, TRUE, NULL, + trash, NULL)) == 0) + { + sleep_until_file_deleted(pid_file); + } + else + { + pid_t pid = get_server_pid(pid_file); + + // shutdown failed - kill server + kill_server(pid); + + sleep(TRY_MAX); + + // remove pid file if possible + err = remove(pid_file); + } + + // free args + free_args(al); + + return err; +} + +/****************************************************************************** + + get_server_pid() + + Get the VM id with the given pid file. + +******************************************************************************/ +pid_t get_server_pid(char *pid_file) +{ + char buf[PATH_MAX]; + int fd, err; + char *p; + pid_t id; + + // discover id + fd = open(pid_file, O_RDONLY); + + err = read(fd, buf, PATH_MAX); + + close(fd); + + if (err > 0) + { + // terminate string + if ((p = strchr(buf, '\n')) != NULL) + { + *p = NULL; + + // check for a '\r' + if ((p = strchr(buf, '\r')) != NULL) + { + *p = NULL; + } + } + else + { + buf[err] = NULL; + } + + id = strtol(buf, NULL, 0); + } + + return id; +} + +/****************************************************************************** + + kill_server() + + Force a kill of the server with the given pid. + +******************************************************************************/ +void kill_server(pid_t pid) +{ + if (pid > 0) + { + // destroy vm + NXVmDestroy(pid); + } +} + +/****************************************************************************** + + del_tree() + + Delete the directory and subdirectories. + +******************************************************************************/ +void del_tree(char *dir) +{ + DIR *parent = opendir(dir); + DIR *entry; + char temp[PATH_MAX]; + + if (parent == NULL) + { + return; + } + + while((entry = readdir(parent)) != NULL) + { + // create long name + snprintf(temp, PATH_MAX, "%s/%s", dir, entry->d_name); + + if (entry->d_name[0] == '.') + { + // Skip + } + else if (S_ISDIR(entry->d_type)) + { + // delete subdirectory + del_tree(temp); + } + else + { + // remove file + remove(temp); + } + } + + // remove directory + rmdir(dir); +} + +/****************************************************************************** + + removef() + +******************************************************************************/ +int removef(char *format, ...) +{ + va_list ap; + char path[PATH_MAX]; + + va_start(ap, format); + + vsnprintf(path, PATH_MAX, format, ap); + + va_end(ap); + + return remove(path); +} + +/****************************************************************************** + + get_basedir() + +******************************************************************************/ +void get_basedir(char *argv0, char *basedir) +{ + char temp[PATH_MAX]; + char *p; + + ASSERT(argv0 != NULL); + ASSERT(basedir != NULL); + + strcpy(temp, strlwr(argv0)); + while((p = strchr(temp, '\\')) != NULL) *p = '/'; + + if ((p = strindex(temp, "/bin/")) != NULL) + { + *p = NULL; + strcpy(basedir, temp); + } +} + diff --git a/netware/my_manage.h b/netware/my_manage.h new file mode 100644 index 00000000000..92ed66ea865 --- /dev/null +++ b/netware/my_manage.h @@ -0,0 +1,83 @@ +/* + Copyright (c) 2002 Novell, Inc. All Rights Reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#ifndef _MY_MANAGE +#define _MY_MANAGE + +/****************************************************************************** + + includes + +******************************************************************************/ + +#include <stdlib.h> +#include <unistd.h> + +/****************************************************************************** + + macros + +******************************************************************************/ + +#define ARG_MAX 50 +#define TRY_MAX 5 + +#define init_args(al) _init_args(&al); +#define free_args(al) _free_args(&al); + +/****************************************************************************** + + structures + +******************************************************************************/ + +typedef struct +{ + + int argc; + char *argv[ARG_MAX]; + +} arg_list_t, * arg_list; + +/****************************************************************************** + + global variables + +******************************************************************************/ + +/****************************************************************************** + + prototypes + +******************************************************************************/ + +void _init_args(arg_list *); +void add_arg(arg_list, char *, ...); +void _free_args(arg_list *); +int sleep_until_file_exists(char *); +int sleep_until_file_deleted(char *); +int wait_for_server_start(char *, char *, char *, int); +int spawn(char *, arg_list, int, char *, char *, char *); +int stop_server(char *, char *, char *, int, char *); +pid_t get_server_pid(char *); +void kill_server(pid_t pid); +void del_tree(char *); +int removef(char *, ...); +void get_basedir(char *, char *); + +#endif /* _MY_MANAGE */ diff --git a/netware/mysql_install_db.c b/netware/mysql_install_db.c new file mode 100644 index 00000000000..96f416880b1 --- /dev/null +++ b/netware/mysql_install_db.c @@ -0,0 +1,437 @@ +/* + Copyright (c) 2002 Novell, Inc. All Rights Reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include <stdlib.h> +#include <stdio.h> +#include <netdb.h> +#include <sys/stat.h> +#include <monitor.h> +#include <strings.h> +#include <getopt.h> +#include <screen.h> + +#include "my_config.h" +#include "my_manage.h" + +/****************************************************************************** + + global variables + +******************************************************************************/ +char autoclose; +char basedir[PATH_MAX]; +char datadir[PATH_MAX]; +char err_log[PATH_MAX]; +char out_log[PATH_MAX]; +char mysqld[PATH_MAX]; +char hostname[PATH_MAX]; +char sql_file[PATH_MAX]; +char default_option[PATH_MAX]; + +/****************************************************************************** + + prototypes + +******************************************************************************/ + +void start_defaults(int, char*[]); +void finish_defaults(); +void read_defaults(arg_list); +void parse_args(int, char*[]); +void get_options(int, char*[]); +void create_paths(); +int mysql_install_db(int argc, char *argv[]); + +/****************************************************************************** + + functions + +******************************************************************************/ + +/****************************************************************************** + + start_defaults() + + Start setting the defaults. + +******************************************************************************/ +void start_defaults(int argc, char *argv[]) +{ + struct stat buf; + int i; + + // default options + static char *default_options[] = + { + "--no-defaults", + "--defaults-file=", + "--defaults-extra-file=", + NULL + }; + + // autoclose + autoclose = FALSE; + + // basedir + get_basedir(argv[0], basedir); + + // hostname + if (gethostname(hostname,PATH_MAX) < 0) + { + // default + strcpy(hostname,"mysql"); + } + + // default option + default_option[0] = NULL; + for (i=0; (argc > 1) && default_options[i]; i++) + { + if(!strnicmp(argv[1], default_options[i], strlen(default_options[i]))) + { + strncpy(default_option, argv[1], PATH_MAX); + break; + } + } + + // set after basedir is established + datadir[0] = NULL; + err_log[0] = NULL; + out_log[0] = NULL; + mysqld[0] = NULL; + sql_file[0] = NULL; +} + +/****************************************************************************** + + finish_defaults() + + Finish setting the defaults. + +******************************************************************************/ +void finish_defaults() +{ + struct stat buf; + int i; + + // datadir + if (!datadir[0]) snprintf(datadir, PATH_MAX, "%s/data", basedir); + + // err-log + if (!err_log[0]) snprintf(err_log, PATH_MAX, "%s/%s.err", datadir, hostname); + + // out-log + if (!out_log[0]) snprintf(out_log, PATH_MAX, "%s/%s.out", datadir, hostname); + + // sql-file + if (!sql_file[0]) snprintf(sql_file, PATH_MAX, "%s/bin/init_db.sql", basedir); + + // mysqld + if (!mysqld[0]) snprintf(mysqld, PATH_MAX, "%s/bin/mysqld", basedir); +} + +/****************************************************************************** + + read_defaults() + + Read the defaults. + +******************************************************************************/ +void read_defaults(arg_list pal) +{ + arg_list al; + char defaults_file[PATH_MAX]; + char mydefaults[PATH_MAX]; + char line[PATH_MAX]; + FILE *fp; + + // defaults output file + snprintf(defaults_file, PATH_MAX, "%s/bin/defaults.out", basedir); + remove(defaults_file); + + // mysqladmin file + snprintf(mydefaults, PATH_MAX, "%s/bin/my_print_defaults", basedir); + + // args + init_args(al); + add_arg(al, mydefaults); + if (default_option[0]) add_arg(al, default_option); + add_arg(al, "mysqld"); + add_arg(al, "mysql_install_db"); + + spawn(mydefaults, al, TRUE, NULL, defaults_file, NULL); + + free_args(al); + + // gather defaults + if((fp = fopen(defaults_file, "r")) != NULL) + { + while(fgets(line, PATH_MAX, fp)) + { + char *p; + + // remove end-of-line character + if ((p = strrchr(line, '\n')) != NULL) *p = '\0'; + + // add the option as an argument + add_arg(pal, line); + } + + fclose(fp); + } + + // remove file + remove(defaults_file); +} + +/****************************************************************************** + + parse_args() + + Get the options. + +******************************************************************************/ +void parse_args(int argc, char *argv[]) +{ + int index = 0; + int c; + + // parse options + enum opts + { + OPT_BASEDIR = 0xFF, + OPT_DATADIR, + OPT_SQL_FILE + }; + + static struct option options[] = + { + {"autoclose", no_argument, &autoclose, TRUE}, + {"basedir", required_argument, 0, OPT_BASEDIR}, + {"datadir", required_argument, 0, OPT_DATADIR}, + {"sql-file", required_argument, 0, OPT_SQL_FILE}, + {0, 0, 0, 0} + }; + + // we have to reset getopt_long because we use it multiple times + optind = 1; + + // turn off error reporting + opterr = 0; + + while ((c = getopt_long(argc, argv, "b:h:", options, &index)) >= 0) + { + switch (c) + { + case OPT_BASEDIR: + case 'b': + strcpy(basedir, optarg); + break; + + case OPT_DATADIR: + case 'h': + strcpy(datadir, optarg); + break; + + case OPT_SQL_FILE: + strcpy(sql_file, optarg); + break; + + default: + // ignore + break; + } + } +} + +/****************************************************************************** + + get_options() + + Get the options. + +******************************************************************************/ +void get_options(int argc, char *argv[]) +{ + arg_list al; + + // start defaults + start_defaults(argc, argv); + + // default file arguments + init_args(al); + add_arg(al, "dummy"); + read_defaults(al); + parse_args(al->argc, al->argv); + free_args(al); + + // command-line arguments + parse_args(argc, argv); + + // finish defaults + finish_defaults(); +} + +/****************************************************************************** + + create_paths() + + Create database paths. + +******************************************************************************/ +void create_paths() +{ + struct stat info; + char temp[PATH_MAX]; + + // check for tables + snprintf(temp, PATH_MAX, "%s/mysql/host.frm", datadir); + if (!stat(temp, &info)) + { + printf("A database already exists in the directory:\n"); + printf("\t%s\n\n", datadir); + exit(-1); + } + + // data directory + if (stat(datadir, &info)) + { + mkdir(datadir, 0); + } + + // mysql directory + snprintf(temp, PATH_MAX, "%s/mysql", datadir); + if (stat(temp, &info)) + { + mkdir(temp, 0); + } + + // test directory + snprintf(temp, PATH_MAX, "%s/test", datadir); + if (stat(temp, &info)) + { + mkdir(temp, 0); + } +} + +/****************************************************************************** + + mysql_install_db() + + Install the database. + +******************************************************************************/ +int mysql_install_db(int argc, char *argv[]) +{ + arg_list al; + int i, j, err; + char skip; + + // private options + static char *private_options[] = + { + "--autoclose", + "--sql-file=", + NULL + }; + + // args + init_args(al); + add_arg(al, "%s", mysqld); + + // parent args + for(i = 1; i < argc; i++) + { + skip = FALSE; + + // skip private arguments + for (j=0; private_options[j]; j++) + { + if(!strnicmp(argv[i], private_options[j], strlen(private_options[j]))) + { + skip = TRUE; + break; + } + } + + if (!skip) add_arg(al, "%s", argv[i]); + } + + add_arg(al, "--bootstrap"); + add_arg(al, "--skip-grant-tables"); + add_arg(al, "--skip-innodb"); + add_arg(al, "--skip-bdb"); + + // spawn mysqld + err = spawn(mysqld, al, TRUE, sql_file, out_log, err_log); + + // free args + free_args(al); + + return err; +} + +/****************************************************************************** + + main() + +******************************************************************************/ +int main(int argc, char **argv) +{ + // get options + get_options(argc, argv); + + // check for an autoclose option + if (!autoclose) setscreenmode(SCR_NO_MODE); + + // create paths + create_paths(); + + // install the database + if (mysql_install_db(argc, argv)) + { + printf("ERROR - The database creation failed!\n"); + printf("See the following log for more infomration:\n"); + printf("\t%s\n\n", err_log); + exit(-1); + } + + // status + printf("Initial database successfully created in the directory:\n"); + printf("\t%s\n", datadir); + + // info + printf("\nPLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !\n"); + + printf("\nThis is done with:\n"); + printf("\tmysqladmin -u root password 'new-password'\n"); + + printf("\nSee the manual for more instructions.\n"); + + printf("\nYou can start the MySQL daemon with:\n"); + printf("\tmysqld_safe\n"); + + printf("\nPlease report any problems with:\n"); + printf("\t/mysql/mysqlbug.txt\n"); + + printf("\nThe latest information about MySQL is available on the web at\n"); + printf("\thttp://www.mysql.com\n"); + + printf("\nSupport MySQL by buying support at https://order.mysql.com\n\n"); + + return 0; +} diff --git a/netware/mysql_secure_installation.pl b/netware/mysql_secure_installation.pl new file mode 100644 index 00000000000..e363cacbc0d --- /dev/null +++ b/netware/mysql_secure_installation.pl @@ -0,0 +1,219 @@ +#----------------------------------------------------------------------------- +# Copyright (C) 2002 MySQL AB and Jeremy Cole +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +#----------------------------------------------------------------------------- + +#----------------------------------------------------------------------------- +# This notice applies to changes, created by or for Novell, Inc., +# to preexisting works for which notices appear elsewhere in this file. + +# Copyright (c) 2003 Novell, Inc. All Rights Reserved. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +#----------------------------------------------------------------------------- + +use strict; +use Mysql; + +print "MySQL Secure Installation Script\n\n"; + +print "NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL\n"; +print " SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!\n\n"; + +#----------------------------------------------------------------------------- +# get the current root password +#----------------------------------------------------------------------------- + +print "In order to log into MySQL to secure it, we'll need the current\n"; +print "password for the root user. If you've just installed MySQL, and\n"; +print "you haven't set the root password yet, the password will be blank,\n"; +print "so you should just press enter here.\n\n"; + +print "Enter the current password for root: "; +my $password = <STDIN>; +chomp $password; +print "\n"; + +my $conn = Mysql->connect("localhost", "mysql", "root", $password) + || die "Unable to connect to MySQL."; + +print "OK, successfully used the password, moving on...\n\n"; + +#----------------------------------------------------------------------------- +# set the root password +#----------------------------------------------------------------------------- + +unless ($password) +{ + print "Setting the root password ensures that no one can log into MySQL\n"; + print "using the root user without the proper authorization.\n\n"; + + print "Set root password (Y/N)? "; + my $reply = <STDIN>; + chomp $reply; + print "\n"; + + if ($reply =~ /Y/i) + { + print "New password for root: "; + my $pass1 = <STDIN>; + chomp $pass1; + print "\n"; + + print "Re-enter new password for root: "; + my $pass2 = <STDIN>; + chomp $pass2; + print "\n"; + + unless ($pass1 eq $pass2) { die "Sorry, the passwords do not match."; } + + unless ($pass1) { die "Sorry, you can't use an empty password here."; } + + $conn->query("SET PASSWORD FOR root\@localhost=PASSWORD('$pass1')") + || die "Unable to set password."; + + print "OK, successfully set the password, moving on...\n\n"; + } + else + { + print "WARNING, the password is not set, moving on...\n\n"; + } +} + +#----------------------------------------------------------------------------- +# remove anonymous users +#----------------------------------------------------------------------------- + +print "By default, a MySQL installation has anonymous users, allowing anyone\n"; +print "to log into MySQL without having to have a user account created for\n"; +print "them. This is intended only for testing, and to make the installation\n"; +print "go a bit smoother. You should remove them before moving into a\n"; +print "production environment.\n\n"; + +print "Remove anonymous users (Y/N)? "; +my $reply = <STDIN>; +chomp $reply; +print "\n"; + +if ($reply =~ /Y/i) +{ + $conn->query("DELETE FROM mysql.user WHERE user=''") + || die "Unable to remove anonymous users."; + + print "OK, successfully removed anonymous users, moving on...\n\n"; +} +else +{ + print "WARNING, the anonymous users have not been removed, moving on...\n\n"; +} + +#----------------------------------------------------------------------------- +# disallow remote root login +#----------------------------------------------------------------------------- + +print "Normally, root should only be allowed to connect from 'localhost'. This\n"; +print "ensures that someone cannot guess at the root password from the network.\n\n"; + +print "Disallow remote root login (Y/N)? "; +my $reply = <STDIN>; +chomp $reply; +print "\n"; + +if ($reply =~ /Y/i) +{ + $conn->query("DELETE FROM mysql.user WHERE user='root' AND host!='localhost'") + || die "Unable to disallow remote root login."; + + print "OK, successfully disallowed remote root login, moving on...\n\n"; +} +else +{ + print "WARNING, remote root login has not been disallowed, moving on...\n\n"; +} + +#----------------------------------------------------------------------------- +# remove test database +#----------------------------------------------------------------------------- + +print "By default, MySQL comes with a database named 'test' that anyone can\n"; +print "access. This is intended only for testing, and should be removed\n"; +print "before moving into a production environment.\n\n"; + +print "Remove the test database (Y/N)? "; +my $reply = <STDIN>; +chomp $reply; +print "\n"; + +if ($reply =~ /Y/i) +{ + $conn->query("DROP DATABASE IF EXISTS test") + || die "Unable to remove test database."; + + $conn->query("DELETE FROM mysql.db WHERE db='test' OR db='test\\_%'") + || die "Unable to remove access to the test database."; + + print "OK, successfully removed the test database, moving on...\n\n"; +} +else +{ + print "WARNING, the test database has not been removed, moving on...\n\n"; +} + +#----------------------------------------------------------------------------- +# reload privilege tables +#----------------------------------------------------------------------------- + +print "Reloading the privilege tables will ensure that all changes made so far\n"; +print "will take effect immediately.\n\n"; + +print "Reload privilege tables (Y/N)? "; +my $reply = <STDIN>; +chomp $reply; +print "\n"; + +if ($reply =~ /Y/i) +{ + $conn->query("FLUSH PRIVILEGES") + || die "Unable to reload privilege tables."; + + print "OK, successfully reloaded privilege tables, moving on...\n\n"; +} +else +{ + print "WARNING, the privilege tables have not been reloaded, moving on...\n\n"; +} + +#----------------------------------------------------------------------------- +# done +#----------------------------------------------------------------------------- + +print "\n\nAll done! If you've completed all of the above steps, your MySQL\n"; +print "installation should now be secure.\n\n"; + +print "Thanks for using MySQL!\n\n"; + diff --git a/netware/mysql_test_run.c b/netware/mysql_test_run.c new file mode 100644 index 00000000000..7392a96cc73 --- /dev/null +++ b/netware/mysql_test_run.c @@ -0,0 +1,1150 @@ +/* + Copyright (c) 2002, 2003 Novell, Inc. All Rights Reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include <stdlib.h> +#include <stdio.h> +#include <errno.h> +#include <dirent.h> +#include <string.h> +#include <screen.h> +#include <nks/vm.h> +#include <ctype.h> +#include <sys/stat.h> +#include <unistd.h> +#include <fcntl.h> + +#include "my_manage.h" + +/****************************************************************************** + + macros + +******************************************************************************/ + +#define HEADER "TEST ELAPSED RESULT \n" +#define DASH "------------------------------------------------------------------------\n" + +#define NW_TEST_SUFFIX ".nw-test" +#define NW_RESULT_SUFFIX ".nw-result" +#define TEST_SUFFIX ".test" +#define RESULT_SUFFIX ".result" +#define REJECT_SUFFIX ".reject" +#define OUT_SUFFIX ".out" +#define ERR_SUFFIX ".err" + +#define TEST_PASS "[ pass ]" +#define TEST_SKIP "[ skip ]" +#define TEST_FAIL "[ fail ]" +#define TEST_BAD "[ bad ]" + +/****************************************************************************** + + global variables + +******************************************************************************/ + +char base_dir[PATH_MAX] = "sys:/mysql"; +char db[PATH_MAX] = "test"; +char user[PATH_MAX] = "root"; +char password[PATH_MAX] = ""; + +int master_port = 9306; +int slave_port = 9307; + +// comma delimited list of tests to skip or empty string +char skip_test[PATH_MAX] = ""; + +char bin_dir[PATH_MAX]; +char mysql_test_dir[PATH_MAX]; +char test_dir[PATH_MAX]; +char mysql_tmp_dir[PATH_MAX]; +char result_dir[PATH_MAX]; +char master_dir[PATH_MAX]; +char slave_dir[PATH_MAX]; +char lang_dir[PATH_MAX]; +char char_dir[PATH_MAX]; + +char mysqladmin_file[PATH_MAX]; +char mysqld_file[PATH_MAX]; +char mysqltest_file[PATH_MAX]; +char master_pid[PATH_MAX]; +char slave_pid[PATH_MAX]; + +char master_opt[PATH_MAX] = ""; +char slave_opt[PATH_MAX] = ""; + +char slave_master_info[PATH_MAX] = ""; + +char master_init_script[PATH_MAX] = ""; +char slave_init_script[PATH_MAX] = ""; + +int total_skip = 0; +int total_pass = 0; +int total_fail = 0; +int total_test = 0; + +double total_time = 0; + +int master_running = FALSE; +int slave_running = FALSE; +int skip_slave = TRUE; +int single_test = TRUE; + +int restarts = 0; + +FILE *log_fd = NULL; + +/****************************************************************************** + + functions + +******************************************************************************/ + +/****************************************************************************** + + prototypes + +******************************************************************************/ + +void report_stats(); +void install_db(char *); +void mysql_install_db(); +void start_master(); +void start_slave(); +void mysql_start(); +void stop_slave(); +void stop_master(); +void mysql_stop(); +void mysql_restart(); +int read_option(char *, char *); +void run_test(char *); +void setup(char *); +void vlog(char *, va_list); +void log(char *, ...); +void log_info(char *, ...); +void log_error(char *, ...); +void log_errno(char *, ...); +void die(char *); + +/****************************************************************************** + + report_stats() + + Report the gathered statistics. + +******************************************************************************/ +void report_stats() +{ + if (total_fail == 0) + { + log("\nAll %d test(s) were successful.\n", total_test); + } + else + { + double percent = ((double)total_pass / total_test) * 100; + + log("\nFailed %u/%u test(s), %.02f%% successful.\n", + total_fail, total_test, percent); + log("\nThe .out and .err files in %s may give you some\n", result_dir); + log("hint of what when wrong.\n"); + log("\nIf you want to report this error, please first read the documentation\n"); + log("at: http://www.mysql.com/doc/M/y/MySQL_test_suite.html\n"); + } + + log("\n%.02f total minutes elapsed in the test cases\n\n", total_time / 60); +} + +/****************************************************************************** + + install_db() + + Install the a database. + +******************************************************************************/ +void install_db(char *datadir) +{ + arg_list al; + int err, i; + char input[PATH_MAX]; + char output[PATH_MAX]; + char error[PATH_MAX]; + + // input file + snprintf(input, PATH_MAX, "%s/bin/init_db.sql", base_dir); + snprintf(output, PATH_MAX, "%s/install.out", datadir); + snprintf(error, PATH_MAX, "%s/install.err", datadir); + + // args + init_args(al); + add_arg(al, mysqld_file); + add_arg(al, "--bootstrap"); + add_arg(al, "--skip-grant-tables"); + add_arg(al, "--basedir=%s", base_dir); + add_arg(al, "--datadir=%s", datadir); + add_arg(al, "--skip-innodb"); + add_arg(al, "--skip-bdb"); + + // spawn + if ((err = spawn(mysqld_file, al, TRUE, input, output, error)) != 0) + { + die("Unable to create database."); + } + + // free args + free_args(al); +} + +/****************************************************************************** + + mysql_install_db() + + Install the test databases. + +******************************************************************************/ +void mysql_install_db() +{ + char temp[PATH_MAX]; + + // var directory + snprintf(temp, PATH_MAX, "%s/var", mysql_test_dir); + + // clean up old direcotry + del_tree(temp); + + // create var directory + mkdir(temp, S_IRWXU); + + // create subdirectories + snprintf(temp, PATH_MAX, "%s/var/run", mysql_test_dir); + mkdir(temp, S_IRWXU); + snprintf(temp, PATH_MAX, "%s/var/tmp", mysql_test_dir); + mkdir(temp, S_IRWXU); + snprintf(temp, PATH_MAX, "%s/var/master-data", mysql_test_dir); + mkdir(temp, S_IRWXU); + snprintf(temp, PATH_MAX, "%s/var/master-data/mysql", mysql_test_dir); + mkdir(temp, S_IRWXU); + snprintf(temp, PATH_MAX, "%s/var/master-data/test", mysql_test_dir); + mkdir(temp, S_IRWXU); + snprintf(temp, PATH_MAX, "%s/var/slave-data", mysql_test_dir); + mkdir(temp, S_IRWXU); + snprintf(temp, PATH_MAX, "%s/var/slave-data/mysql", mysql_test_dir); + mkdir(temp, S_IRWXU); + snprintf(temp, PATH_MAX, "%s/var/slave-data/test", mysql_test_dir); + mkdir(temp, S_IRWXU); + + // install databases + install_db(master_dir); + install_db(slave_dir); +} + +/****************************************************************************** + + start_master() + + Start the master server. + +******************************************************************************/ +void start_master() +{ + arg_list al; + int err, i; + char master_out[PATH_MAX]; + char master_err[PATH_MAX]; + + // remove old berkeley db log files that can confuse the server + removef("%s/log.*", master_dir); + + // remove stale binary logs + removef("%s/*-bin.*", master_dir); + + // remove stale binary logs + removef("%s/*.index", master_dir); + + // remove master.info file + removef("%s/master.info", master_dir); + + // remove relay files + removef("%s/var/log/*relay*", mysql_test_dir); + + // remove relay-log.info file + removef("%s/relay-log.info", master_dir); + + // init script + if (master_init_script[0] != NULL) + { + // run_init_script(master_init_script); + } + + // redirection files + snprintf(master_out, PATH_MAX, "%s/var/run/master%u.out", + mysql_test_dir, restarts); + snprintf(master_err, PATH_MAX, "%s/var/run/master%u.err", + mysql_test_dir, restarts); + + // args + init_args(al); + add_arg(al, "%s", mysqld_file); + add_arg(al, "--no-defaults"); + add_arg(al, "--log-bin=master-bin"); + add_arg(al, "--server-id=1"); + add_arg(al, "--basedir=%s", base_dir); + add_arg(al, "--port=%u", master_port); + add_arg(al, "--local-infile"); + add_arg(al, "--core"); + add_arg(al, "--datadir=%s", master_dir); + add_arg(al, "--pid-file=%s", master_pid); + add_arg(al, "--character-sets-dir=%s", char_dir); + add_arg(al, "--tmpdir=%s", mysql_tmp_dir); + add_arg(al, "--language=%s", lang_dir); + + // $MASTER_40_ARGS + add_arg(al, "--rpl-recovery-rank=1"); + add_arg(al, "--init-rpl-role=master"); + + // $SMALL_SERVER + add_arg(al, "-O"); + add_arg(al, "key_buffer_size=1M"); + add_arg(al, "-O"); + add_arg(al, "sort_buffer=256K"); + add_arg(al, "-O"); + add_arg(al, "max_heap_table_size=1M"); + + // $EXTRA_MASTER_OPT + if (master_opt[0] != NULL) + { + char *p; + + p = (char *)strtok(master_opt, " \t"); + + while(p) + { + add_arg(al, "%s", p); + + p = (char *)strtok(NULL, " \t"); + } + } + + // remove the pid file if it exists + remove(master_pid); + + // spawn + if ((err = spawn(mysqld_file, al, FALSE, NULL, master_out, master_err)) == 0) + { + sleep_until_file_exists(master_pid); + + if ((err = wait_for_server_start(bin_dir, user, password, master_port)) == 0) + { + master_running = TRUE; + } + else + { + log_error("The master server went down early."); + } + } + else + { + log_error("Unable to start master server."); + } + + // free_args + free_args(al); +} + +/****************************************************************************** + + start_slave() + + Start the slave server. + +******************************************************************************/ +void start_slave() +{ + arg_list al; + int err, i; + char slave_out[PATH_MAX]; + char slave_err[PATH_MAX]; + char temp[PATH_MAX]; + + // skip? + if (skip_slave) return; + + // remove stale binary logs + removef("%s/*-bin.*", slave_dir); + + // remove stale binary logs + removef("%s/*.index", slave_dir); + + // remove master.info file + removef("%s/master.info", slave_dir); + + // remove relay files + removef("%s/var/log/*relay*", mysql_test_dir); + + // remove relay-log.info file + removef("%s/relay-log.info", slave_dir); + + // init script + if (slave_init_script[0] != NULL) + { + // run_init_script(slave_init_script); + + // TODO: use the scripts + if (strindex(slave_init_script, "rpl000016-slave.sh") != NULL) + { + // create empty master.info file + snprintf(temp, PATH_MAX, "%s/master.info", slave_dir); + close(open(temp, O_WRONLY | O_CREAT)); + } + else if (strindex(slave_init_script, "rpl000017-slave.sh") != NULL) + { + FILE *fp; + + // create a master.info file + snprintf(temp, PATH_MAX, "%s/master.info", slave_dir); + fp = fopen(temp, "wb+"); + + fputs("master-bin.001\n", fp); + fputs("4\n", fp); + fputs("127.0.0.1\n", fp); + fputs("replicate\n", fp); + fputs("aaaaaaaaaaaaaaabthispartofthepasswordisnotused\n", fp); + fputs("9306\n", fp); + fputs("1\n", fp); + fputs("0\n", fp); + + fclose(fp); + } + else if (strindex(slave_init_script, "rpl_rotate_logs-slave.sh") != NULL) + { + // create empty master.info file + snprintf(temp, PATH_MAX, "%s/master.info", slave_dir); + close(open(temp, O_WRONLY | O_CREAT)); + } + } + + // redirection files + snprintf(slave_out, PATH_MAX, "%s/var/run/slave%u.out", + mysql_test_dir, restarts); + snprintf(slave_err, PATH_MAX, "%s/var/run/slave%u.err", + mysql_test_dir, restarts); + + // args + init_args(al); + add_arg(al, "%s", mysqld_file); + add_arg(al, "--no-defaults"); + add_arg(al, "--log-bin=slave-bin"); + add_arg(al, "--relay_log=slave-relay-bin"); + add_arg(al, "--basedir=%s", base_dir); + add_arg(al, "--port=%u", slave_port); + add_arg(al, "--datadir=%s", slave_dir); + add_arg(al, "--pid-file=%s", slave_pid); + add_arg(al, "--character-sets-dir=%s", char_dir); + add_arg(al, "--core"); + add_arg(al, "--tmpdir=%s", mysql_tmp_dir); + add_arg(al, "--language=%s", lang_dir); + + add_arg(al, "--exit-info=256"); + add_arg(al, "--log-slave-updates"); + add_arg(al, "--init-rpl-role=slave"); + add_arg(al, "--skip-innodb"); + add_arg(al, "--skip-slave-start"); + add_arg(al, "--slave-load-tmpdir=../../var/tmp"); + + add_arg(al, "--report-user=%s", user); + add_arg(al, "--report-host=127.0.0.1"); + add_arg(al, "--report-port=%u", slave_port); + + add_arg(al, "--master-retry-count=10"); + add_arg(al, "-O"); + add_arg(al, "slave_net_timeout=10"); + + // slave master info + if (slave_master_info[0] != NULL) + { + char *p; + + p = (char *)strtok(slave_master_info, " \t"); + + while(p) + { + add_arg(al, "%s", p); + + p = (char *)strtok(NULL, " \t"); + } + } + else + { + add_arg(al, "--master-user=%s", user); + add_arg(al, "--master-password=%s", password); + add_arg(al, "--master-host=127.0.0.1"); + add_arg(al, "--master-port=%u", master_port); + add_arg(al, "--master-connect-retry=1"); + add_arg(al, "--server-id=2"); + add_arg(al, "--rpl-recovery-rank=2"); + } + + // small server + add_arg(al, "-O"); + add_arg(al, "key_buffer_size=1M"); + add_arg(al, "-O"); + add_arg(al, "sort_buffer=256K"); + add_arg(al, "-O"); + add_arg(al, "max_heap_table_size=1M"); + + // opt args + if (slave_opt[0] != NULL) + { + char *p; + + p = (char *)strtok(slave_opt, " \t"); + + while(p) + { + add_arg(al, "%s", p); + + p = (char *)strtok(NULL, " \t"); + } + } + + // remove the pid file if it exists + remove(slave_pid); + + // spawn + if ((err = spawn(mysqld_file, al, FALSE, NULL, slave_out, slave_err)) == 0) + { + sleep_until_file_exists(slave_pid); + + if ((err = wait_for_server_start(bin_dir, user, password, slave_port)) == 0) + { + slave_running = TRUE; + } + else + { + log_error("The slave server went down early."); + } + } + else + { + log_error("Unable to start slave server."); + } + + // free args + free_args(al); +} + +/****************************************************************************** + + mysql_start() + + Start the mysql servers. + +******************************************************************************/ +void mysql_start() +{ + start_master(); + + start_slave(); + + // activate the test screen + ActivateScreen(getscreenhandle()); +} + +/****************************************************************************** + + stop_slave() + + Stop the slave server. + +******************************************************************************/ +void stop_slave() +{ + int err; + + // running? + if (!slave_running) return; + + // stop + if ((err = stop_server(bin_dir, user, password, slave_port, slave_pid)) == 0) + { + slave_running = FALSE; + } + else + { + log_error("Unable to stop slave server."); + } +} + +/****************************************************************************** + + stop_master() + + Stop the master server. + +******************************************************************************/ +void stop_master() +{ + int err; + + // running? + if (!master_running) return; + + if ((err = stop_server(bin_dir, user, password, master_port, master_pid)) == 0) + { + master_running = FALSE; + } + else + { + log_error("Unable to stop master server."); + } +} + +/****************************************************************************** + + mysql_stop() + + Stop the mysql servers. + +******************************************************************************/ +void mysql_stop() +{ + stop_master(); + + stop_slave(); + + // activate the test screen + ActivateScreen(getscreenhandle()); +} + +/****************************************************************************** + + mysql_restart() + + Restart the mysql servers. + +******************************************************************************/ +void mysql_restart() +{ + log_info("Restarting the MySQL server(s): %u", ++restarts); + + mysql_stop(); + + mysql_start(); +} + +/****************************************************************************** + + read_option() + + Read the option file. + +******************************************************************************/ +int read_option(char *opt_file, char *opt) +{ + int fd, err; + int result; + char *p; + char buf[PATH_MAX]; + + // copy current option + strncpy(buf, opt, PATH_MAX); + + // open options file + fd = open(opt_file, O_RDONLY); + + err = read(fd, opt, PATH_MAX); + + close(fd); + + if (err > 0) + { + // terminate string + if ((p = strchr(opt, '\n')) != NULL) + { + *p = NULL; + + // check for a '\r' + if ((p = strchr(opt, '\r')) != NULL) + { + *p = NULL; + } + } + else + { + opt[err] = NULL; + } + + // check for $MYSQL_TEST_DIR + if ((p = strstr(opt, "$MYSQL_TEST_DIR")) != NULL) + { + char temp[PATH_MAX]; + + *p = NULL; + + strcpy(temp, p + strlen("$MYSQL_TEST_DIR")); + + strcat(opt, mysql_test_dir); + + strcat(opt, temp); + } + } + else + { + // clear option + *opt = NULL; + } + + // compare current option with previous + return strcmp(opt, buf); +} + +/****************************************************************************** + + run_test() + + Run the given test case. + +******************************************************************************/ +void run_test(char *test) +{ + char temp[PATH_MAX]; + char *rstr; + double elapsed = 0; + int skip = FALSE; + int restart = FALSE; + int flag = FALSE; + struct stat info; + + // single test? + if (!single_test) + { + // skip tests in the skip list + snprintf(temp, PATH_MAX, " %s ", test); + skip = (strindex(skip_test, temp) != NULL); + } + + // skip test? + if (!skip) + { + char test_file[PATH_MAX]; + char master_opt_file[PATH_MAX]; + char slave_opt_file[PATH_MAX]; + char slave_master_info_file[PATH_MAX]; + char result_file[PATH_MAX]; + char reject_file[PATH_MAX]; + char out_file[PATH_MAX]; + char err_file[PATH_MAX]; + int err; + arg_list al; + NXTime_t start, stop; + + // skip slave? + flag = skip_slave; + skip_slave = (strncmp(test, "rpl", 3) != 0); + if (flag != skip_slave) restart = TRUE; + + // create files + snprintf(master_opt_file, PATH_MAX, "%s/%s-master.opt", test_dir, test); + snprintf(slave_opt_file, PATH_MAX, "%s/%s-slave.opt", test_dir, test); + snprintf(slave_master_info_file, PATH_MAX, "%s/%s-slave-master-info.opt", test_dir, test); + snprintf(reject_file, PATH_MAX, "%s/%s%s", result_dir, test, REJECT_SUFFIX); + snprintf(out_file, PATH_MAX, "%s/%s%s", result_dir, test, OUT_SUFFIX); + snprintf(err_file, PATH_MAX, "%s/%s%s", result_dir, test, ERR_SUFFIX); + + // netware specific files + snprintf(test_file, PATH_MAX, "%s/%s%s", test_dir, test, NW_TEST_SUFFIX); + if (stat(test_file, &info)) + { + snprintf(test_file, PATH_MAX, "%s/%s%s", test_dir, test, TEST_SUFFIX); + } + + snprintf(result_file, PATH_MAX, "%s/%s%s", result_dir, test, NW_RESULT_SUFFIX); + if (stat(result_file, &info)) + { + snprintf(result_file, PATH_MAX, "%s/%s%s", result_dir, test, RESULT_SUFFIX); + } + + // init scripts + snprintf(master_init_script, PATH_MAX, "%s/%s-master.sh", test_dir, test); + if (stat(master_init_script, &info)) + master_init_script[0] = NULL; + else + restart = TRUE; + + snprintf(slave_init_script, PATH_MAX, "%s/%s-slave.sh", test_dir, test); + if (stat(slave_init_script, &info)) + slave_init_script[0] = NULL; + else + restart = TRUE; + + // read options + if (read_option(master_opt_file, master_opt)) restart = TRUE; + if (read_option(slave_opt_file, slave_opt)) restart = TRUE; + if (read_option(slave_master_info_file, slave_master_info)) restart = TRUE; + + // cleanup previous run + remove(reject_file); + remove(out_file); + remove(err_file); + + // start or restart? + if (!master_running) mysql_start(); + else if (restart) mysql_restart(); + + // let the system stabalize + sleep(1); + + // show test + log("%-46s ", test); + + // args + init_args(al); + add_arg(al, "%s", mysqltest_file); + add_arg(al, "--no-defaults"); + add_arg(al, "--port=%u", master_port); + add_arg(al, "--database=%s", db); + add_arg(al, "--user=%s", user); + add_arg(al, "--password=%s", password); + add_arg(al, "--silent"); + add_arg(al, "--basedir=%s/", mysql_test_dir); + add_arg(al, "--host=127.0.0.1"); + add_arg(al, "-v"); + add_arg(al, "-R"); + add_arg(al, "%s", result_file); + + // start timer + NXGetTime(NX_SINCE_BOOT, NX_USECONDS, &start); + + // spawn + err = spawn(mysqltest_file, al, TRUE, test_file, out_file, err_file); + + // stop timer + NXGetTime(NX_SINCE_BOOT, NX_USECONDS, &stop); + + // calculate + elapsed = ((double)(stop - start)) / NX_USECONDS; + total_time += elapsed; + + // free args + free_args(al); + + if (err == 0) + { + // pass + rstr = TEST_PASS; + ++total_pass; + + // increment total + ++total_test; + } + else if (err == 2) + { + // skip + rstr = TEST_SKIP; + ++total_skip; + } + else if (err == 1) + { + // fail + rstr = TEST_FAIL; + ++total_fail; + + // increment total + ++total_test; + } + else + { + rstr = TEST_BAD; + } + } + else // early skips + { + // show test + log("%-46s ", test); + + // skip + rstr = TEST_SKIP; + ++total_skip; + } + + // result + log("%10.06f %-14s\n", elapsed, rstr); +} + +/****************************************************************************** + + vlog() + + Log the message. + +******************************************************************************/ +void vlog(char *format, va_list ap) +{ + vfprintf(stdout, format, ap); + fflush(stdout); + + if (log_fd) + { + vfprintf(log_fd, format, ap); + fflush(log_fd); + } +} + +/****************************************************************************** + + log() + + Log the message. + +******************************************************************************/ +void log(char *format, ...) +{ + va_list ap; + + va_start(ap, format); + + vlog(format, ap); + + va_end(ap); +} + +/****************************************************************************** + + log_info() + + Log the given information. + +******************************************************************************/ +void log_info(char *format, ...) +{ + va_list ap; + + va_start(ap, format); + + log("-- INFO : "); + vlog(format, ap); + log("\n"); + + va_end(ap); +} + +/****************************************************************************** + + log_error() + + Log the given error. + +******************************************************************************/ +void log_error(char *format, ...) +{ + va_list ap; + + va_start(ap, format); + + log("-- ERROR: "); + vlog(format, ap); + log("\n"); + + va_end(ap); +} + +/****************************************************************************** + + log_errno() + + Log the given error and errno. + +******************************************************************************/ +void log_errno(char *format, ...) +{ + va_list ap; + + va_start(ap, format); + + log("-- ERROR: (%003u) ", errno); + vlog(format, ap); + log("\n"); + + va_end(ap); +} + +/****************************************************************************** + + die() + + Exit the application. + +******************************************************************************/ +void die(char *msg) +{ + log_error(msg); + + pressanykey(); + + exit(-1); +} + +/****************************************************************************** + + setup() + + Setup the mysql test enviornment. + +******************************************************************************/ +void setup(char *file) +{ + char temp[PATH_MAX]; + char *p; + + // set the timezone for the timestamp test + setenv("TZ", "GMT-3", TRUE); + + // find base dir + strcpy(temp, strlwr(file)); + while((p = strchr(temp, '\\')) != NULL) *p = '/'; + + if ((p = strindex(temp, "/mysql-test/")) != NULL) + { + *p = NULL; + strcpy(base_dir, temp); + } + + // setup paths + snprintf(bin_dir, PATH_MAX, "%s/bin", base_dir); + snprintf(mysql_test_dir, PATH_MAX, "%s/mysql-test", base_dir); + snprintf(test_dir, PATH_MAX, "%s/t", mysql_test_dir); + snprintf(mysql_tmp_dir, PATH_MAX, "%s/var/tmp", mysql_test_dir); + snprintf(result_dir, PATH_MAX, "%s/r", mysql_test_dir); + snprintf(master_dir, PATH_MAX, "%s/var/master-data", mysql_test_dir); + snprintf(slave_dir, PATH_MAX, "%s/var/slave-data", mysql_test_dir); + snprintf(lang_dir, PATH_MAX, "%s/share/english", base_dir); + snprintf(char_dir, PATH_MAX, "%s/share/charsets", base_dir); + + // setup files + snprintf(mysqld_file, PATH_MAX, "%s/mysqld", bin_dir); + snprintf(mysqltest_file, PATH_MAX, "%s/mysqltest", bin_dir); + snprintf(mysqladmin_file, PATH_MAX, "%s/mysqladmin", bin_dir); + snprintf(master_pid, PATH_MAX, "%s/var/run/master.pid", mysql_test_dir); + snprintf(slave_pid, PATH_MAX, "%s/var/run/slave.pid", mysql_test_dir); + + // create log file + snprintf(temp, PATH_MAX, "%s/mysql-test-run.log", mysql_test_dir); + if ((log_fd = fopen(temp, "w+")) == NULL) + { + log_errno("Unable to create log file."); + } + + // prepare skip test list + while((p = strchr(skip_test, ',')) != NULL) *p = ' '; + strcpy(temp, strlwr(skip_test)); + snprintf(skip_test, PATH_MAX, " %s ", temp); + + // enviornment + setenv("MYSQL_TEST_DIR", mysql_test_dir, 1); + + // install test databases + mysql_install_db(); +} + +/****************************************************************************** + + main() + +******************************************************************************/ +int main(int argc, char **argv) +{ + log("Initializing Tests...\n"); + + // setup + setup(argv[0]); + + log("Starting Tests...\n"); + + log("\n"); + log(HEADER); + log(DASH); + + if (argc > 1) + { + int i; + + // single test + single_test = TRUE; + + for (i = 1; i < argc; i++) + { + // run given test + run_test(argv[i]); + } + } + else + { + // run all tests + DIR *dir = opendir(test_dir); + DIR *entry; + char test[NAME_MAX]; + char *p; + + // single test + single_test = FALSE; + + if (dir == NULL) + { + die("Unable to open tests directory."); + } + + while((entry = readdir(dir)) != NULL) + { + if (!S_ISDIR(entry->d_type)) + { + strcpy(test, strlwr(entry->d_name)); + + // find the test suffix + if ((p = strindex(test, TEST_SUFFIX)) != NULL) + { + // null terminate at the suffix + *p = '\0'; + + // run test + run_test(test); + } + } + } + + closedir(dir); + } + + log(DASH); + log("\n"); + + log("Ending Tests...\n"); + + // stop server + mysql_stop(); + + // report stats + report_stats(); + + // close log + if (log_fd) fclose(log_fd); + + // keep results up + pressanykey(); + + return 0; +} + diff --git a/netware/mysqld_safe.c b/netware/mysqld_safe.c new file mode 100644 index 00000000000..cf0d6989d8d --- /dev/null +++ b/netware/mysqld_safe.c @@ -0,0 +1,662 @@ +/*
+ Copyright (c) 2003 Novell, Inc. All Rights Reserved.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <netdb.h>
+#include <sys/stat.h>
+#include <monitor.h>
+#include <strings.h>
+#include <getopt.h>
+#include <screen.h>
+#include <dirent.h>
+
+#include "my_config.h"
+#include "my_manage.h"
+
+/******************************************************************************
+
+ global variables
+
+******************************************************************************/
+char autoclose;
+char basedir[PATH_MAX];
+char datadir[PATH_MAX];
+char pid_file[PATH_MAX];
+char address[PATH_MAX];
+char port[PATH_MAX];
+char err_log[PATH_MAX];
+char safe_log[PATH_MAX];
+char mysqld[PATH_MAX];
+char hostname[PATH_MAX];
+char default_option[PATH_MAX];
+
+FILE *log_fd = NULL;
+
+/******************************************************************************
+
+ prototypes
+
+******************************************************************************/
+
+void vlog(char *, va_list);
+void log(char *, ...);
+void start_defaults(int, char*[]);
+void finish_defaults();
+void read_defaults(arg_list);
+void parse_args(int, char*[]);
+void get_options(int, char*[]);
+void check_data_vol();
+void check_setup();
+void check_tables();
+void mysql_start(int, char*[]);
+
+/******************************************************************************
+
+ functions
+
+******************************************************************************/
+
+/******************************************************************************
+
+ vlog()
+
+ Log the message.
+
+******************************************************************************/
+void vlog(char *format, va_list ap)
+{
+ vfprintf(stdout, format, ap);
+ fflush(stdout);
+
+ if (log_fd)
+ {
+ vfprintf(log_fd, format, ap);
+ fflush(log_fd);
+ }
+}
+
+/******************************************************************************
+
+ log()
+
+ Log the message.
+
+******************************************************************************/
+void log(char *format, ...)
+{
+ va_list ap;
+
+ va_start(ap, format);
+
+ vlog(format, ap);
+
+ va_end(ap);
+}
+
+/******************************************************************************
+
+ start_defaults()
+
+ Start setting the defaults.
+
+******************************************************************************/
+void start_defaults(int argc, char *argv[])
+{
+ struct stat buf;
+ int i;
+
+ // default options
+ static char *default_options[] =
+ {
+ "--no-defaults",
+ "--defaults-file=",
+ "--defaults-extra-file=",
+ NULL
+ };
+
+ // autoclose
+ autoclose = FALSE;
+
+ // basedir
+ get_basedir(argv[0], basedir);
+
+ // hostname
+ if (gethostname(hostname,PATH_MAX) < 0)
+ {
+ // default
+ strcpy(hostname,"mysql");
+ }
+
+ // address
+ snprintf(address, PATH_MAX, "0.0.0.0");
+
+ // port
+ snprintf(port, PATH_MAX, "3306");
+
+ // default option
+ default_option[0] = NULL;
+ for (i=0; (argc > 1) && default_options[i]; i++)
+ {
+ if(!strnicmp(argv[1], default_options[i], strlen(default_options[i])))
+ {
+ strncpy(default_option, argv[1], PATH_MAX);
+ break;
+ }
+ }
+
+ // set after basedir is established
+ datadir[0] = NULL;
+ pid_file[0] = NULL;
+ err_log[0] = NULL;
+ safe_log[0] = NULL;
+ mysqld[0] = NULL;
+}
+
+/******************************************************************************
+
+ finish_defaults()
+
+ Finish settig the defaults.
+
+******************************************************************************/
+void finish_defaults()
+{
+ struct stat buf;
+ int i;
+
+ // datadir
+ if (!datadir[0]) snprintf(datadir, PATH_MAX, "%s/data", basedir);
+
+ // pid-file
+ if (!pid_file[0]) snprintf(pid_file, PATH_MAX, "%s/%s.pid", datadir, hostname);
+
+ // err-log
+ if (!err_log[0]) snprintf(err_log, PATH_MAX, "%s/%s.err", datadir, hostname);
+
+ // safe-log
+ if (!safe_log[0]) snprintf(safe_log, PATH_MAX, "%s/%s.log", datadir, hostname);
+
+ // mysqld
+ if (!mysqld[0]) snprintf(mysqld, PATH_MAX, "%s/bin/mysqld-max", basedir);
+
+ if (stat(mysqld, &buf))
+ {
+ snprintf(mysqld, PATH_MAX, "%s/bin/mysqld", basedir);
+ }
+}
+
+/******************************************************************************
+
+ read_defaults()
+
+ Read the defaults.
+
+******************************************************************************/
+void read_defaults(arg_list pal)
+{
+ arg_list al;
+ char defaults_file[PATH_MAX];
+ char mydefaults[PATH_MAX];
+ char line[PATH_MAX];
+ FILE *fp;
+
+ // defaults output file
+ snprintf(defaults_file, PATH_MAX, "%s/bin/defaults.out", basedir);
+ remove(defaults_file);
+
+ // mysqladmin file
+ snprintf(mydefaults, PATH_MAX, "%s/bin/my_print_defaults", basedir);
+
+ // args
+ init_args(al);
+ add_arg(al, mydefaults);
+ if (default_option[0]) add_arg(al, default_option);
+ add_arg(al, "mysqld");
+ add_arg(al, "server");
+ add_arg(al, "mysqld_safe");
+ add_arg(al, "safe_mysqld");
+
+ spawn(mydefaults, al, TRUE, NULL, defaults_file, NULL);
+
+ free_args(al);
+
+ // gather defaults
+ if((fp = fopen(defaults_file, "r")) != NULL)
+ {
+ while(fgets(line, PATH_MAX, fp))
+ {
+ char *p;
+
+ // remove end-of-line character
+ if ((p = strrchr(line, '\n')) != NULL) *p = '\0';
+
+ // add the option as an argument
+ add_arg(pal, line);
+ }
+
+ fclose(fp);
+ }
+
+ // remove file
+ remove(defaults_file);
+}
+
+/******************************************************************************
+
+ parse_args()
+
+ Get the options.
+
+******************************************************************************/
+void parse_args(int argc, char *argv[])
+{
+ int index = 0;
+ int c;
+
+ // parse options
+ enum opts
+ {
+ OPT_BASEDIR = 0xFF,
+ OPT_DATADIR,
+ OPT_PID_FILE,
+ OPT_BIND_ADDRESS,
+ OPT_PORT,
+ OPT_ERR_LOG,
+ OPT_SAFE_LOG,
+ OPT_MYSQLD
+ };
+
+ static struct option options[] =
+ {
+ {"autoclose", no_argument, &autoclose, TRUE},
+ {"basedir", required_argument, 0, OPT_BASEDIR},
+ {"datadir", required_argument, 0, OPT_DATADIR},
+ {"pid-file", required_argument, 0, OPT_PID_FILE},
+ {"bind-address", required_argument, 0, OPT_BIND_ADDRESS},
+ {"port", required_argument, 0, OPT_PORT},
+ {"err-log", required_argument, 0, OPT_ERR_LOG},
+ {"safe-log", required_argument, 0, OPT_SAFE_LOG},
+ {"mysqld", required_argument, 0, OPT_MYSQLD},
+ {0, 0, 0, 0}
+ };
+
+ // we have to reset getopt_long because we use it multiple times
+ optind = 1;
+
+ // turn off error reporting
+ opterr = 0;
+
+ while ((c = getopt_long(argc, argv, "b:h:P:", options, &index)) >= 0)
+ {
+ switch (c)
+ {
+ case OPT_BASEDIR:
+ case 'b':
+ strcpy(basedir, optarg);
+ break;
+
+ case OPT_DATADIR:
+ case 'h':
+ strcpy(datadir, optarg);
+ break;
+
+ case OPT_PID_FILE:
+ strcpy(pid_file, optarg);
+ break;
+
+ case OPT_BIND_ADDRESS:
+ strcpy(address, optarg);
+ break;
+
+ case OPT_PORT:
+ case 'P':
+ strcpy(port, optarg);
+ break;
+
+ case OPT_ERR_LOG:
+ strcpy(err_log, optarg);
+ break;
+
+ case OPT_SAFE_LOG:
+ strcpy(safe_log, optarg);
+ break;
+
+ case OPT_MYSQLD:
+ strcpy(mysqld, optarg);
+ break;
+
+ default:
+ // ignore
+ break;
+ }
+ }
+}
+
+/******************************************************************************
+
+ get_options()
+
+ Get the options.
+
+******************************************************************************/
+void get_options(int argc, char *argv[])
+{
+ arg_list al;
+
+ // start defaults
+ start_defaults(argc, argv);
+
+ // default file arguments
+ init_args(al);
+ add_arg(al, "dummy");
+ read_defaults(al);
+ parse_args(al->argc, al->argv);
+ free_args(al);
+
+ // command-line arguments
+ parse_args(argc, argv);
+
+ // finish defaults
+ finish_defaults();
+}
+
+/******************************************************************************
+
+ check_data_vol()
+
+ Check the database volume.
+
+******************************************************************************/
+void check_data_vol()
+{
+ // warn if the data is on a Traditional volume
+ struct volume_info vol;
+ char buff[PATH_MAX];
+ char *p;
+
+ // clear struct
+ memset(&vol, 0, sizeof(vol));
+
+ // find volume name
+ strcpy(buff, datadir);
+ if (p = strchr(buff, ':'))
+ {
+ // terminate after volume name
+ *p = 0;
+ }
+ else
+ {
+ // assume SYS volume
+ strcpy(buff, "SYS");
+ }
+
+ // retrieve information
+ netware_vol_info_from_name(&vol, buff);
+
+ if ((vol.flags & VOL_NSS_PRESENT) == 0)
+ {
+ log("Error: The data directory is not on an NSS volume!\n\n");
+ exit(-1);
+ }
+}
+
+/******************************************************************************
+
+ check_setup()
+
+ Check the current setup.
+
+******************************************************************************/
+void check_setup()
+{
+ struct stat info;
+ char temp[PATH_MAX];
+
+ // remove any current pid_file
+ if (!stat(pid_file, &info) && (remove(pid_file) < 0))
+ {
+ log("ERROR: Unable to remove current pid file!\n\n");
+ exit(-1);
+ }
+
+ // check the data volume
+ check_data_vol();
+
+ // check for a database
+ snprintf(temp, PATH_MAX, "%s/mysql/host.frm", datadir);
+ if (stat(temp, &info))
+ {
+ log("ERROR: No database found in the data directory!\n\n");
+ exit(-1);
+ }
+}
+
+/******************************************************************************
+
+ check_tables()
+
+ Check the database tables.
+
+******************************************************************************/
+void check_tables()
+{
+ arg_list al;
+ char mycheck[PATH_MAX];
+ char table[PATH_MAX];
+ char db[PATH_MAX];
+ DIR *datadir_entry, *db_entry, *table_entry;
+
+ // status
+ log("checking tables...\n");
+
+ // list databases
+ if ((datadir_entry = opendir(datadir)) == NULL)
+ {
+ return;
+ }
+
+ while((db_entry = readdir(datadir_entry)) != NULL)
+ {
+ if (db_entry->d_name[0] == '.')
+ {
+ // Skip
+ }
+ else if (S_ISDIR(db_entry->d_type))
+ {
+ // create long db name
+ snprintf(db, PATH_MAX, "%s/%s", datadir, db_entry->d_name);
+
+ // list tables
+ if ((db_entry = opendir(db)) == NULL)
+ {
+ continue;
+ }
+
+ while((table_entry = readdir(db_entry)) != NULL)
+ {
+ // create long table name
+ snprintf(table, PATH_MAX, "%s/%s", db, strlwr(table_entry->d_name));
+
+ if (strindex(table, ".myi"))
+ {
+ // ** myisamchk
+
+ // mysqladmin file
+ snprintf(mycheck, PATH_MAX, "%s/bin/myisamchk", basedir);
+
+ // args
+ init_args(al);
+ add_arg(al, mycheck);
+ add_arg(al, "--silent");
+ add_arg(al, "--force");
+ add_arg(al, "--fast");
+ add_arg(al, "--medium-check");
+ add_arg(al, "-O");
+ add_arg(al, "key_buffer=64M");
+ add_arg(al, "-O");
+ add_arg(al, "sort_buffer=64M");
+ add_arg(al, table);
+
+ spawn(mycheck, al, TRUE, NULL, NULL, NULL);
+
+ free_args(al);
+ }
+ else if (strindex(table, ".ism"))
+ {
+ // ** isamchk
+
+ // mysqladmin file
+ snprintf(mycheck, PATH_MAX, "%s/bin/isamchk", basedir);
+
+ // args
+ init_args(al);
+ add_arg(al, mycheck);
+ add_arg(al, "--silent");
+ add_arg(al, "--force");
+ add_arg(al, "-O");
+ add_arg(al, "sort_buffer=64M");
+ add_arg(al, table);
+
+ spawn(mycheck, al, TRUE, NULL, NULL, NULL);
+
+ free_args(al);
+ }
+ }
+ }
+ }
+}
+
+/******************************************************************************
+
+ mysql_start()
+
+ Start the mysql server.
+
+******************************************************************************/
+void mysql_start(int argc, char *argv[])
+{
+ arg_list al;
+ int i, j, err;
+ struct stat info;
+ time_t cal;
+ struct tm lt;
+ char stamp[PATH_MAX];
+ char skip;
+
+ // private options
+ static char *private_options[] =
+ {
+ "--autoclose",
+ "--err-log=",
+ "--mysqld=",
+ NULL
+ };
+
+ // args
+ init_args(al);
+ add_arg(al, "%s", mysqld);
+
+ // parent args
+ for(i = 1; i < argc; i++)
+ {
+ skip = FALSE;
+
+ // skip private arguments
+ for (j=0; private_options[j]; j++)
+ {
+ if(!strnicmp(argv[i], private_options[j], strlen(private_options[j])))
+ {
+ skip = TRUE;
+ break;
+ }
+ }
+
+ if (!skip) add_arg(al, "%s", argv[i]);
+ }
+
+ // spawn
+ do
+ {
+ // check the database tables
+ check_tables();
+
+ // status
+ time(&cal);
+ localtime_r(&cal, <);
+ strftime(stamp, PATH_MAX, "%d %b %Y %H:%M:%S", <);
+ log("mysql started : %s\n", stamp);
+
+ // spawn mysqld
+ spawn(mysqld, al, TRUE, NULL, NULL, err_log);
+ }
+ while (!stat(pid_file, &info));
+
+ // status
+ time(&cal);
+ localtime_r(&cal, <);
+ strftime(stamp, PATH_MAX, "%d %b %Y %H:%M:%S", <);
+ log("mysql stopped : %s\n\n", stamp);
+
+ // free args
+ free_args(al);
+}
+
+/******************************************************************************
+
+ main()
+
+******************************************************************************/
+int main(int argc, char **argv)
+{
+ char temp[PATH_MAX];
+
+ // get the options
+ get_options(argc, argv);
+
+ // keep the screen up
+ if (!autoclose) setscreenmode(SCR_NO_MODE);
+
+ // create log file
+ log_fd = fopen(safe_log, "w+");
+
+ // header
+ log("MySQL Server %s, for %s (%s)\n\n", VERSION, SYSTEM_TYPE, MACHINE_TYPE);
+
+ // status
+ log("address : %s\n", address);
+ log("port : %s\n", port);
+ log("daemon : %s\n", mysqld);
+ log("base directory : %s\n", basedir);
+ log("data directory : %s\n", datadir);
+ log("pid file : %s\n", pid_file);
+ log("error file : %s\n", err_log);
+ log("log file : %s\n", safe_log);
+ log("\n");
+
+ // check setup
+ check_setup();
+
+ // start the MySQL server
+ mysql_start(argc, argv);
+
+ // close log file
+ if (log_fd) fclose(log_fd);
+
+ return 0;
+}
diff --git a/netware/netware.patch b/netware/netware.patch new file mode 100644 index 00000000000..2dcf36a2d9c --- /dev/null +++ b/netware/netware.patch @@ -0,0 +1,4162 @@ +*** mysql-4.0.7-gamma/ltmain.sh Fri Dec 20 07:25:10 2002 +--- mysql40/ltmain.sh Mon Jan 6 09:26:55 2003 +*************** +*** 49,62 **** + fi + + # The name of this program. +! progname=`$echo "$0" | sed 's%^.*/%%'` + modename="$progname" + + # Constants. + PROGRAM=ltmain.sh + PACKAGE=libtool +! VERSION=1.4.2 +! TIMESTAMP=" (1.922.2.53 2001/09/11 03:18:52)" + + default_mode= + help="Try \`$progname --help' for more information." +--- 49,62 ---- + fi + + # The name of this program. +! progname=`$echo "$0" | ${SED} 's%^.*/%%'` + modename="$progname" + + # Constants. + PROGRAM=ltmain.sh + PACKAGE=libtool +! VERSION=1.4e +! TIMESTAMP=" (1.1125 2002/06/26 07:15:36)" + + default_mode= + help="Try \`$progname --help' for more information." +*************** +*** 67,76 **** + + # Sed substitution that helps us do robust quoting. It backslashifies + # metacharacters that are still active within double-quoted strings. +! Xsed='sed -e 1s/^X//' + sed_quote_subst='s/\([\\`\\"$\\\\]\)/\\\1/g' +! SP2NL='tr \040 \012' +! NL2SP='tr \015\012 \040\040' + + # NLS nuisances. + # Only set LANG and LC_ALL to C if already set. +--- 67,85 ---- + + # Sed substitution that helps us do robust quoting. It backslashifies + # metacharacters that are still active within double-quoted strings. +! Xsed="${SED}"' -e 1s/^X//' + sed_quote_subst='s/\([\\`\\"$\\\\]\)/\\\1/g' +! # test EBCDIC or ASCII +! case `echo A|od -x` in +! *[Cc]1*) # EBCDIC based system +! SP2NL="tr '\100' '\n'" +! NL2SP="tr '\r\n' '\100\100'" +! ;; +! *) # Assume ASCII based system +! SP2NL="tr '\040' '\012'" +! NL2SP="tr '\015\012' '\040\040'" +! ;; +! esac + + # NLS nuisances. + # Only set LANG and LC_ALL to C if already set. +*************** +*** 106,112 **** + o2lo="s/\\.${objext}\$/.lo/" + + # Parse our command line options once, thoroughly. +! while test $# -gt 0 + do + arg="$1" + shift +--- 115,121 ---- + o2lo="s/\\.${objext}\$/.lo/" + + # Parse our command line options once, thoroughly. +! while test "$#" -gt 0 + do + arg="$1" + shift +*************** +*** 122,127 **** +--- 131,163 ---- + execute_dlfiles) + execute_dlfiles="$execute_dlfiles $arg" + ;; ++ tag) ++ tagname="$arg" ++ ++ # Check whether tagname contains only valid characters ++ case $tagname in ++ *[!-_A-Za-z0-9,/]*) ++ echo "$progname: invalid tag name: $tagname" 1>&2 ++ exit 1 ++ ;; ++ esac ++ ++ case $tagname in ++ CC) ++ # Don't test for the "default" C tag, as we know, it's there, but ++ # not specially marked. ++ ;; ++ *) ++ if grep "^# ### BEGIN LIBTOOL TAG CONFIG: $tagname$" < "$0" > /dev/null; then ++ taglist="$taglist $tagname" ++ # Evaluate the configuration. ++ eval "`${SED} -n -e '/^# ### BEGIN LIBTOOL TAG CONFIG: '$tagname'$/,/^# ### END LIBTOOL TAG CONFIG: '$tagname'$/p' < $0`" ++ else ++ echo "$progname: ignoring unknown tag $tagname" 1>&2 ++ fi ++ ;; ++ esac ++ ;; + *) + eval "$prev=\$arg" + ;; +*************** +*** 140,150 **** + + --version) + echo "$PROGRAM (GNU $PACKAGE) $VERSION$TIMESTAMP" + exit 0 + ;; + + --config) +! sed -e '1,/^# ### BEGIN LIBTOOL CONFIG/d' -e '/^# ### END LIBTOOL CONFIG/,$d' $0 + exit 0 + ;; + +--- 176,195 ---- + + --version) + echo "$PROGRAM (GNU $PACKAGE) $VERSION$TIMESTAMP" ++ echo ++ echo "Copyright 1996, 1997, 1998, 1999, 2000, 2001" ++ echo "Free Software Foundation, Inc." ++ echo "This is free software; see the source for copying conditions. There is NO" ++ echo "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." + exit 0 + ;; + + --config) +! ${SED} -e '1,/^# ### BEGIN LIBTOOL CONFIG/d' -e '/^# ### END LIBTOOL CONFIG/,$d' $0 +! # Now print the configurations for the tags. +! for tagname in $taglist; do +! ${SED} -n -e "/^# ### BEGIN LIBTOOL TAG CONFIG: $tagname$/,/^# ### END LIBTOOL TAG CONFIG: $tagname$/p" < "$0" +! done + exit 0 + ;; + +*************** +*** 177,186 **** +--- 222,240 ---- + --mode) prevopt="--mode" prev=mode ;; + --mode=*) mode="$optarg" ;; + ++ --preserve-dup-deps) duplicate_deps="yes" ;; ++ + --quiet | --silent) + show=: + ;; + ++ --tag) prevopt="--tag" prev=tag ;; ++ --tag=*) ++ set tag "$optarg" ${1+"$@"} ++ shift ++ prev=tag ++ ;; ++ + -dlopen) + prevopt="-dlopen" + prev=execute_dlfiles +*************** +*** 270,317 **** + modename="$modename: compile" + # Get the compilation command and the source file. + base_compile= +! prev= +! lastarg= +! srcfile="$nonopt" + suppress_output= + +- user_target=no + for arg + do +! case $prev in +! "") ;; +! xcompiler) +! # Aesthetically quote the previous argument. +! prev= +! lastarg=`$echo "X$arg" | $Xsed -e "$sed_quote_subst"` +! +! case $arg in +! # Double-quote args containing other shell metacharacters. +! # Many Bourne shells cannot handle close brackets correctly +! # in scan sets, so we specify it separately. +! *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \ ]*|*]*|"") +! arg="\"$arg\"" + ;; +- esac + +! # Add the previous argument to base_compile. +! if test -z "$base_compile"; then +! base_compile="$lastarg" +! else +! base_compile="$base_compile $lastarg" +! fi + continue + ;; +- esac + + # Accept any command-line options. + case $arg in + -o) +! if test "$user_target" != "no"; then + $echo "$modename: you cannot specify \`-o' more than once" 1>&2 + exit 1 + fi +! user_target=next + ;; + + -static) +--- 324,359 ---- + modename="$modename: compile" + # Get the compilation command and the source file. + base_compile= +! srcfile="$nonopt" # always keep a non-empty value in "srcfile" + suppress_output= ++ arg_mode=normal ++ libobj= + + for arg + do +! case "$arg_mode" in +! arg ) +! # do not "continue". Instead, add this to base_compile +! lastarg="$arg" +! arg_mode=normal + ;; + +! target ) +! libobj="$arg" +! arg_mode=normal + continue + ;; + ++ normal ) + # Accept any command-line options. + case $arg in + -o) +! if test -n "$libobj" ; then + $echo "$modename: you cannot specify \`-o' more than once" 1>&2 + exit 1 + fi +! arg_mode=target +! continue + ;; + + -static) +*************** +*** 330,338 **** + ;; + + -Xcompiler) +! prev=xcompiler +! continue +! ;; + + -Wc,*) + args=`$echo "X$arg" | $Xsed -e "s/^-Wc,//"` +--- 372,380 ---- + ;; + + -Xcompiler) +! arg_mode=arg # the next one goes into the "base_compile" arg list +! continue # The current "srcfile" will either be retained or +! ;; # replaced later. I would guess that would be a bug. + + -Wc,*) + args=`$echo "X$arg" | $Xsed -e "s/^-Wc,//"` +*************** +*** 355,427 **** + lastarg=`$echo "X$lastarg" | $Xsed -e "s/^ //"` + + # Add the arguments to base_compile. +- if test -z "$base_compile"; then +- base_compile="$lastarg" +- else + base_compile="$base_compile $lastarg" +- fi + continue + ;; +- esac +- +- case $user_target in +- next) +- # The next one is the -o target name +- user_target=yes +- continue +- ;; +- yes) +- # We got the output file +- user_target=set +- libobj="$arg" +- continue +- ;; +- esac + + # Accept the current argument as the source file. + lastarg="$srcfile" + srcfile="$arg" + + # Aesthetically quote the previous argument. +- +- # Backslashify any backslashes, double quotes, and dollar signs. +- # These are the only characters that are still specially +- # interpreted inside of double-quoted scrings. + lastarg=`$echo "X$lastarg" | $Xsed -e "$sed_quote_subst"` + + # Double-quote args containing other shell metacharacters. + # Many Bourne shells cannot handle close brackets correctly + # in scan sets, so we specify it separately. +- case $lastarg in + *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \ ]*|*]*|"") + lastarg="\"$lastarg\"" + ;; + esac + +- # Add the previous argument to base_compile. +- if test -z "$base_compile"; then +- base_compile="$lastarg" +- else + base_compile="$base_compile $lastarg" +! fi +! done + +! case $user_target in +! set) +! ;; +! no) +! # Get the name of the library object. +! libobj=`$echo "X$srcfile" | $Xsed -e 's%^.*/%%'` + ;; +! *) + $echo "$modename: you must specify a target with \`-o'" 1>&2 + exit 1 + ;; + esac + + # Recognize several different file suffixes. + # If the user specifies -o file.o, it is replaced with file.lo +! xform='[cCFSfmso]' + case $libobj in + *.ada) xform=ada ;; + *.adb) xform=adb ;; +--- 397,450 ---- + lastarg=`$echo "X$lastarg" | $Xsed -e "s/^ //"` + + # Add the arguments to base_compile. + base_compile="$base_compile $lastarg" + continue + ;; + ++ * ) + # Accept the current argument as the source file. ++ # The previous "srcfile" becomes the current argument. ++ # + lastarg="$srcfile" + srcfile="$arg" ++ ;; ++ esac # case $arg ++ ;; ++ esac # case $arg_mode + + # Aesthetically quote the previous argument. + lastarg=`$echo "X$lastarg" | $Xsed -e "$sed_quote_subst"` + ++ case $lastarg in + # Double-quote args containing other shell metacharacters. + # Many Bourne shells cannot handle close brackets correctly + # in scan sets, so we specify it separately. + *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \ ]*|*]*|"") + lastarg="\"$lastarg\"" + ;; + esac + + base_compile="$base_compile $lastarg" +! done # for arg + +! case $arg_mode in +! arg) +! $echo "$modename: you must specify an argument for -Xcompile" +! exit 1 + ;; +! target) + $echo "$modename: you must specify a target with \`-o'" 1>&2 + exit 1 + ;; ++ *) ++ # Get the name of the library object. ++ [ -z "$libobj" ] && libobj=`$echo "X$srcfile" | $Xsed -e 's%^.*/%%'` ++ ;; + esac + + # Recognize several different file suffixes. + # If the user specifies -o file.o, it is replaced with file.lo +! xform='[cCFSifmso]' + case $libobj in + *.ada) xform=ada ;; + *.adb) xform=adb ;; +*************** +*** 429,438 **** +--- 452,464 ---- + *.asm) xform=asm ;; + *.c++) xform=c++ ;; + *.cc) xform=cc ;; ++ *.ii) xform=ii ;; ++ *.class) xform=class ;; + *.cpp) xform=cpp ;; + *.cxx) xform=cxx ;; + *.f90) xform=f90 ;; + *.for) xform=for ;; ++ *.java) xform=java ;; + esac + + libobj=`$echo "X$libobj" | $Xsed -e "s/\.$xform$/.lo/"` +*************** +*** 445,450 **** +--- 471,526 ---- + ;; + esac + ++ # Infer tagged configuration to use if any are available and ++ # if one wasn't chosen via the "--tag" command line option. ++ # Only attempt this if the compiler in the base compile ++ # command doesn't match the default compiler. ++ if test -n "$available_tags" && test -z "$tagname"; then ++ case $base_compile in ++ # Blanks in the command may have been stripped by the calling shell, ++ # but not from the CC environment variable when ltconfig was run. ++ " $CC "* | "$CC "* | " `$echo $CC` "* | "`$echo $CC` "*) ;; ++ # Blanks at the start of $base_compile will cause this to fail ++ # if we don't check for them as well. ++ *) ++ for z in $available_tags; do ++ if grep "^# ### BEGIN LIBTOOL TAG CONFIG: $z$" < "$0" > /dev/null; then ++ # Evaluate the configuration. ++ eval "`${SED} -n -e '/^# ### BEGIN LIBTOOL TAG CONFIG: '$z'$/,/^# ### END LIBTOOL TAG CONFIG: '$z'$/p' < $0`" ++ case "$base_compile " in ++ "$CC "* | " $CC "* | "`$echo $CC` "* | " `$echo $CC` "*) ++ # The compiler in the base compile command matches ++ # the one in the tagged configuration. ++ # Assume this is the tagged configuration we want. ++ tagname=$z ++ break ++ ;; ++ esac ++ fi ++ done ++ # If $tagname still isn't set, then no tagged configuration ++ # was found and let the user know that the "--tag" command ++ # line option must be used. ++ if test -z "$tagname"; then ++ echo "$modename: unable to infer tagged configuration" ++ echo "$modename: specify a tag with \`--tag'" 1>&2 ++ exit 1 ++ # else ++ # echo "$modename: using $tagname tagged configuration" ++ fi ++ ;; ++ esac ++ fi ++ ++ objname=`$echo "X$obj" | $Xsed -e 's%^.*/%%'` ++ xdir=`$echo "X$obj" | $Xsed -e 's%/[^/]*$%%'` ++ if test "X$xdir" = "X$obj"; then ++ xdir= ++ else ++ xdir=$xdir/ ++ fi ++ lobj=${xdir}$objdir/$objname ++ + if test -z "$base_compile"; then + $echo "$modename: you must specify a compilation command" 1>&2 + $echo "$help" 1>&2 +*************** +*** 453,461 **** + + # Delete any leftover library objects. + if test "$build_old_libs" = yes; then +! removelist="$obj $libobj" + else +! removelist="$libobj" + fi + + $run $rm $removelist +--- 529,537 ---- + + # Delete any leftover library objects. + if test "$build_old_libs" = yes; then +! removelist="$obj $lobj $libobj ${libobj}T" + else +! removelist="$lobj $libobj ${libobj}T" + fi + + $run $rm $removelist +*************** +*** 467,473 **** + pic_mode=default + ;; + esac +! if test $pic_mode = no && test "$deplibs_check_method" != pass_all; then + # non-PIC code in shared libraries is not supported + pic_mode=default + fi +--- 543,549 ---- + pic_mode=default + ;; + esac +! if test "$pic_mode" = no && test "$deplibs_check_method" != pass_all; then + # non-PIC code in shared libraries is not supported + pic_mode=default + fi +*************** +*** 480,485 **** +--- 556,562 ---- + removelist="$removelist $output_obj $lockfile" + trap "$run $rm $removelist; exit 1" 1 2 15 + else ++ output_obj= + need_locks=no + lockfile= + fi +*************** +*** 514,562 **** + eval srcfile=\"$fix_srcfile_path\" + fi + + # Only build a PIC object if we are building libtool libraries. + if test "$build_libtool_libs" = yes; then + # Without this assignment, base_compile gets emptied. + fbsd_hideous_sh_bug=$base_compile + + if test "$pic_mode" != no; then +! # All platforms use -DPIC, to notify preprocessed assembler code. +! command="$base_compile $srcfile $pic_flag -DPIC" + else + # Don't build PIC code + command="$base_compile $srcfile" + fi +- if test "$build_old_libs" = yes; then +- lo_libobj="$libobj" +- dir=`$echo "X$libobj" | $Xsed -e 's%/[^/]*$%%'` +- if test "X$dir" = "X$libobj"; then +- dir="$objdir" +- else +- dir="$dir/$objdir" +- fi +- libobj="$dir/"`$echo "X$libobj" | $Xsed -e 's%^.*/%%'` + +! if test -d "$dir"; then +! $show "$rm $libobj" +! $run $rm $libobj +! else +! $show "$mkdir $dir" +! $run $mkdir $dir + status=$? +! if test $status -ne 0 && test ! -d $dir; then + exit $status + fi + fi +! fi +! if test "$compiler_o_lo" = yes; then +! output_obj="$libobj" +! command="$command -o $output_obj" +! elif test "$compiler_c_o" = yes; then +! output_obj="$obj" +! command="$command -o $output_obj" + fi + +! $run $rm "$output_obj" + $show "$command" + if $run eval "$command"; then : + else +--- 591,638 ---- + eval srcfile=\"$fix_srcfile_path\" + fi + ++ $run $rm "$libobj" "${libobj}T" ++ ++ # Create a libtool object file (analogous to a ".la" file), ++ # but don't create it if we're doing a dry run. ++ test -z "$run" && cat > ${libobj}T <<EOF ++ # $libobj - a libtool object file ++ # Generated by $PROGRAM - GNU $PACKAGE $VERSION$TIMESTAMP ++ # ++ # Please DO NOT delete this file! ++ # It is necessary for linking the library. ++ ++ # Name of the PIC object. ++ EOF ++ + # Only build a PIC object if we are building libtool libraries. + if test "$build_libtool_libs" = yes; then + # Without this assignment, base_compile gets emptied. + fbsd_hideous_sh_bug=$base_compile + + if test "$pic_mode" != no; then +! command="$base_compile $srcfile $pic_flag" + else + # Don't build PIC code + command="$base_compile $srcfile" + fi + +! if test ! -d "${xdir}$objdir"; then +! $show "$mkdir ${xdir}$objdir" +! $run $mkdir ${xdir}$objdir + status=$? +! if test "$status" -ne 0 && test ! -d "${xdir}$objdir"; then + exit $status + fi + fi +! +! if test -z "$output_obj"; then +! # Place PIC objects in $objdir +! command="$command -o $lobj" + fi + +! $run $rm "$lobj" "$output_obj" +! + $show "$command" + if $run eval "$command"; then : + else +*************** +*** 565,571 **** + fi + + if test "$need_locks" = warn && +! test x"`cat $lockfile 2>/dev/null`" != x"$srcfile"; then + echo "\ + *** ERROR, $lockfile contains: + `cat $lockfile 2>/dev/null` +--- 641,647 ---- + fi + + if test "$need_locks" = warn && +! test "X`cat $lockfile 2>/dev/null`" != "X$srcfile"; then + echo "\ + *** ERROR, $lockfile contains: + `cat $lockfile 2>/dev/null` +*************** +*** 585,593 **** + fi + + # Just move the object if needed, then go on to compile the next one +! if test x"$output_obj" != x"$libobj"; then +! $show "$mv $output_obj $libobj" +! if $run $mv $output_obj $libobj; then : + else + error=$? + $run $rm $removelist +--- 661,669 ---- + fi + + # Just move the object if needed, then go on to compile the next one +! if test -n "$output_obj" && test "X$output_obj" != "X$lobj"; then +! $show "$mv $output_obj $lobj" +! if $run $mv $output_obj $lobj; then : + else + error=$? + $run $rm $removelist +*************** +*** 595,642 **** + fi + fi + +! # If we have no pic_flag, then copy the object into place and finish. +! if (test -z "$pic_flag" || test "$pic_mode" != default) && +! test "$build_old_libs" = yes; then +! # Rename the .lo from within objdir to obj +! if test -f $obj; then +! $show $rm $obj +! $run $rm $obj +! fi + +! $show "$mv $libobj $obj" +! if $run $mv $libobj $obj; then : +! else +! error=$? +! $run $rm $removelist +! exit $error +! fi +! +! xdir=`$echo "X$obj" | $Xsed -e 's%/[^/]*$%%'` +! if test "X$xdir" = "X$obj"; then +! xdir="." +! else +! xdir="$xdir" +! fi +! baseobj=`$echo "X$obj" | $Xsed -e "s%.*/%%"` +! libobj=`$echo "X$baseobj" | $Xsed -e "$o2lo"` +! # Now arrange that obj and lo_libobj become the same file +! $show "(cd $xdir && $LN_S $baseobj $libobj)" +! if $run eval '(cd $xdir && $LN_S $baseobj $libobj)'; then +! # Unlock the critical section if it was locked +! if test "$need_locks" != no; then +! $run $rm "$lockfile" +! fi +! exit 0 +! else +! error=$? +! $run $rm $removelist +! exit $error +! fi +! fi + + # Allow error messages only from the first compilation. + suppress_output=' >/dev/null 2>&1' + fi + + # Only build a position-dependent object if we build old libraries. +--- 671,691 ---- + fi + fi + +! # Append the name of the PIC object to the libtool object file. +! test -z "$run" && cat >> ${libobj}T <<EOF +! pic_object='$objdir/$objname' + +! EOF + + # Allow error messages only from the first compilation. + suppress_output=' >/dev/null 2>&1' ++ else ++ # No PIC object so indicate it doesn't exist in the libtool ++ # object file. ++ test -z "$run" && cat >> ${libobj}T <<EOF ++ pic_object=none ++ ++ EOF + fi + + # Only build a position-dependent object if we build old libraries. +*************** +*** 645,661 **** + # Don't build PIC code + command="$base_compile $srcfile" + else +! # All platforms use -DPIC, to notify preprocessed assembler code. +! command="$base_compile $srcfile $pic_flag -DPIC" + fi + if test "$compiler_c_o" = yes; then + command="$command -o $obj" +- output_obj="$obj" + fi + + # Suppress compiler output if we already did a PIC compilation. + command="$command$suppress_output" +! $run $rm "$output_obj" + $show "$command" + if $run eval "$command"; then : + else +--- 694,708 ---- + # Don't build PIC code + command="$base_compile $srcfile" + else +! command="$base_compile $srcfile $pic_flag" + fi + if test "$compiler_c_o" = yes; then + command="$command -o $obj" + fi + + # Suppress compiler output if we already did a PIC compilation. + command="$command$suppress_output" +! $run $rm "$obj" "$output_obj" + $show "$command" + if $run eval "$command"; then : + else +*************** +*** 664,670 **** + fi + + if test "$need_locks" = warn && +! test x"`cat $lockfile 2>/dev/null`" != x"$srcfile"; then + echo "\ + *** ERROR, $lockfile contains: + `cat $lockfile 2>/dev/null` +--- 711,717 ---- + fi + + if test "$need_locks" = warn && +! test "X`cat $lockfile 2>/dev/null`" != "X$srcfile"; then + echo "\ + *** ERROR, $lockfile contains: + `cat $lockfile 2>/dev/null` +*************** +*** 684,690 **** + fi + + # Just move the object if needed +! if test x"$output_obj" != x"$obj"; then + $show "$mv $output_obj $obj" + if $run $mv $output_obj $obj; then : + else +--- 731,737 ---- + fi + + # Just move the object if needed +! if test -n "$output_obj" && test "X$output_obj" != "X$obj"; then + $show "$mv $output_obj $obj" + if $run $mv $output_obj $obj; then : + else +*************** +*** 694,716 **** + fi + fi + +! # Create an invalid libtool object if no PIC, so that we do not +! # accidentally link it into a program. +! if test "$build_libtool_libs" != yes; then +! $show "echo timestamp > $libobj" +! $run eval "echo timestamp > \$libobj" || exit $? +! else +! # Move the .lo from within objdir +! $show "$mv $libobj $lo_libobj" +! if $run $mv $libobj $lo_libobj; then : + else +! error=$? +! $run $rm $removelist +! exit $error +! fi +! fi + fi + + # Unlock the critical section if it was locked + if test "$need_locks" != no; then + $run $rm "$lockfile" +--- 741,765 ---- + fi + fi + +! # Append the name of the non-PIC object the libtool object file. +! # Only append if the libtool object file exists. +! test -z "$run" && cat >> ${libobj}T <<EOF +! # Name of the non-PIC object. +! non_pic_object='$objname' +! +! EOF + else +! # Append the name of the non-PIC object the libtool object file. +! # Only append if the libtool object file exists. +! test -z "$run" && cat >> ${libobj}T <<EOF +! # Name of the non-PIC object. +! non_pic_object=none +! +! EOF + fi + ++ $run $mv "${libobj}T" "${libobj}" ++ + # Unlock the critical section if it was locked + if test "$need_locks" != no; then + $run $rm "$lockfile" +*************** +*** 742,747 **** +--- 791,797 ---- + ;; + esac + libtool_args="$nonopt" ++ base_compile="$nonopt" + compile_command="$nonopt" + finalize_command="$nonopt" + +*************** +*** 771,776 **** +--- 821,827 ---- + module=no + no_install=no + objs= ++ non_pic_objects= + prefer_static_libs=no + preload=no + prev= +*************** +*** 812,819 **** + test -n "$old_archive_from_new_cmds" && build_old_libs=yes + + # Go through the arguments, transforming them on the way. +! while test $# -gt 0; do + arg="$1" + shift + case $arg in + *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \ ]*|*]*|"") +--- 863,871 ---- + test -n "$old_archive_from_new_cmds" && build_old_libs=yes + + # Go through the arguments, transforming them on the way. +! while test "$#" -gt 0; do + arg="$1" ++ base_compile="$base_compile $arg" + shift + case $arg in + *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \ ]*|*]*|"") +*************** +*** 892,897 **** +--- 944,1056 ---- + prev= + continue + ;; ++ objectlist) ++ if test -f "$arg"; then ++ save_arg=$arg ++ moreargs= ++ for fil in `cat $save_arg` ++ do ++ # moreargs="$moreargs $fil" ++ arg=$fil ++ # A libtool-controlled object. ++ ++ # Check to see that this really is a libtool object. ++ if (${SED} -e '2q' $arg | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then ++ pic_object= ++ non_pic_object= ++ ++ # Read the .lo file ++ # If there is no directory component, then add one. ++ case $arg in ++ */* | *\\*) . $arg ;; ++ *) . ./$arg ;; ++ esac ++ ++ if test -z "$pic_object" || \ ++ test -z "$non_pic_object" || ++ test "$pic_object" = none && \ ++ test "$non_pic_object" = none; then ++ $echo "$modename: cannot find name of object for \`$arg'" 1>&2 ++ exit 1 ++ fi ++ ++ # Extract subdirectory from the argument. ++ xdir=`$echo "X$arg" | $Xsed -e 's%/[^/]*$%%'` ++ if test "X$xdir" = "X$arg"; then ++ xdir= ++ else ++ xdir="$xdir/" ++ fi ++ ++ if test "$pic_object" != none; then ++ # Prepend the subdirectory the object is found in. ++ pic_object="$xdir$pic_object" ++ ++ if test "$prev" = dlfiles; then ++ if test "$build_libtool_libs" = yes && test "$dlopen_support" = yes; then ++ dlfiles="$dlfiles $pic_object" ++ prev= ++ continue ++ else ++ # If libtool objects are unsupported, then we need to preload. ++ prev=dlprefiles ++ fi ++ fi ++ ++ # CHECK ME: I think I busted this. -Ossama ++ if test "$prev" = dlprefiles; then ++ # Preload the old-style object. ++ dlprefiles="$dlprefiles $pic_object" ++ prev= ++ fi ++ ++ # A PIC object. ++ libobjs="$libobjs $pic_object" ++ arg="$pic_object" ++ fi ++ ++ # Non-PIC object. ++ if test "$non_pic_object" != none; then ++ # Prepend the subdirectory the object is found in. ++ non_pic_object="$xdir$non_pic_object" ++ ++ # A standard non-PIC object ++ non_pic_objects="$non_pic_objects $non_pic_object" ++ if test -z "$pic_object" || test "$pic_object" = none ; then ++ arg="$non_pic_object" ++ fi ++ fi ++ else ++ # Only an error if not doing a dry-run. ++ if test -z "$run"; then ++ $echo "$modename: \`$arg' is not a valid libtool object" 1>&2 ++ exit 1 ++ else ++ # Dry-run case. ++ ++ # Extract subdirectory from the argument. ++ xdir=`$echo "X$arg" | $Xsed -e 's%/[^/]*$%%'` ++ if test "X$xdir" = "X$arg"; then ++ xdir= ++ else ++ xdir="$xdir/" ++ fi ++ ++ pic_object=`$echo "X${xdir}${objdir}/${arg}" | $Xsed -e "$lo2o"` ++ non_pic_object=`$echo "X${xdir}${arg}" | $Xsed -e "$lo2o"` ++ libobjs="$libobjs $pic_object" ++ non_pic_objects="$non_pic_objects $non_pic_object" ++ fi ++ fi ++ done ++ else ++ $echo "$modename: link input file \`$save_arg' does not exist" ++ exit 1 ++ fi ++ arg=$save_arg ++ prev= ++ continue ++ ;; + rpath | xrpath) + # We need an absolute path. + case $arg in +*************** +*** 936,945 **** + continue + ;; + esac +! fi # test -n $prev + + prevarg="$arg" + + case $arg in + -all-static) + if test -n "$link_static_flag"; then +--- 1095,1122 ---- + continue + ;; + esac +! fi # test -n "$prev" + + prevarg="$arg" + ++ # Pass Metrowerks x86 NLM linker flags to linker. ++ case "$LD" in ++ mwldnlm) ++ case "$arg" in ++ -check | -commandfile | -entry | -exit | -flags | -map) ++ linker_flags="$linker_flags $qarg" ++ prev=xlinker ++ ;; ++ -nocheck | -zerobss | -nozerobss) ++ linker_flags="$linker_flags $qarg" ++ ;; ++ -g) ++ # If -g then include symbols for NetWare internal debugger ++ linker_flags="$linker_flags -sym internal" ++ ;; ++ esac ++ ;; ++ esac + case $arg in + -all-static) + if test -n "$link_static_flag"; then +*************** +*** 992,998 **** + # so, if we see these flags be careful not to treat them like -L + -L[A-Z][A-Z]*:*) + case $with_gcc/$host in +! no/*-*-irix*) + compile_command="$compile_command $arg" + finalize_command="$finalize_command $arg" + ;; +--- 1169,1175 ---- + # so, if we see these flags be careful not to treat them like -L + -L[A-Z][A-Z]*:*) + case $with_gcc/$host in +! no/*-*-irix* | /*-*-irix*) + compile_command="$compile_command $arg" + finalize_command="$finalize_command $arg" + ;; +*************** +*** 1043,1056 **** + # These systems don't actually have a C library (as such) + test "X$arg" = "X-lc" && continue + ;; +! *-*-openbsd*) + # Do not include libc due to us having libc/libc_r. + test "X$arg" = "X-lc" && continue + ;; + esac + elif test "X$arg" = "X-lc_r"; then + case $host in +! *-*-openbsd*) + # Do not include libc_r directly, use -pthread flag. + continue + ;; +--- 1220,1237 ---- + # These systems don't actually have a C library (as such) + test "X$arg" = "X-lc" && continue + ;; +! *-*-openbsd* | *-*-freebsd*) + # Do not include libc due to us having libc/libc_r. + test "X$arg" = "X-lc" && continue + ;; ++ *-*-rhapsody* | *-*-darwin1.[012]) ++ # Rhapsody C and math libraries are in the System framework ++ deplibs="$deplibs -framework System" ++ continue + esac + elif test "X$arg" = "X-lc_r"; then + case $host in +! *-*-openbsd* | *-*-freebsd*) + # Do not include libc_r directly, use -pthread flag. + continue + ;; +*************** +*** 1089,1094 **** +--- 1270,1280 ---- + continue + ;; + ++ -objectlist) ++ prev=objectlist ++ continue ++ ;; ++ + -o) prev=output ;; + + -release) +*************** +*** 1201,1212 **** + esac + ;; + +! *.lo | *.$objext) +! # A library or standard object. + if test "$prev" = dlfiles; then +- # This file was specified with -dlopen. + if test "$build_libtool_libs" = yes && test "$dlopen_support" = yes; then +! dlfiles="$dlfiles $arg" + prev= + continue + else +--- 1387,1435 ---- + esac + ;; + +! *.$objext) +! # A standard object. +! objs="$objs $arg" +! ;; +! +! *.lo) +! # A libtool-controlled object. +! +! # Check to see that this really is a libtool object. +! if (${SED} -e '2q' $arg | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then +! pic_object= +! non_pic_object= +! +! # Read the .lo file +! # If there is no directory component, then add one. +! case $arg in +! */* | *\\*) . $arg ;; +! *) . ./$arg ;; +! esac +! +! if test -z "$pic_object" || \ +! test -z "$non_pic_object" || +! test "$pic_object" = none && \ +! test "$non_pic_object" = none; then +! $echo "$modename: cannot find name of object for \`$arg'" 1>&2 +! exit 1 +! fi +! +! # Extract subdirectory from the argument. +! xdir=`$echo "X$arg" | $Xsed -e 's%/[^/]*$%%'` +! if test "X$xdir" = "X$arg"; then +! xdir= +! else +! xdir="$xdir/" +! fi +! +! if test "$pic_object" != none; then +! # Prepend the subdirectory the object is found in. +! pic_object="$xdir$pic_object" +! + if test "$prev" = dlfiles; then + if test "$build_libtool_libs" = yes && test "$dlopen_support" = yes; then +! dlfiles="$dlfiles $pic_object" + prev= + continue + else +*************** +*** 1215,1229 **** + fi + fi + + if test "$prev" = dlprefiles; then + # Preload the old-style object. +! dlprefiles="$dlprefiles "`$echo "X$arg" | $Xsed -e "$lo2o"` + prev= + else +! case $arg in +! *.lo) libobjs="$libobjs $arg" ;; +! *) objs="$objs $arg" ;; +! esac + fi + ;; + +--- 1438,1487 ---- + fi + fi + ++ # CHECK ME: I think I busted this. -Ossama + if test "$prev" = dlprefiles; then + # Preload the old-style object. +! dlprefiles="$dlprefiles $pic_object" + prev= ++ fi ++ ++ # A PIC object. ++ libobjs="$libobjs $pic_object" ++ arg="$pic_object" ++ fi ++ ++ # Non-PIC object. ++ if test "$non_pic_object" != none; then ++ # Prepend the subdirectory the object is found in. ++ non_pic_object="$xdir$non_pic_object" ++ ++ # A standard non-PIC object ++ non_pic_objects="$non_pic_objects $non_pic_object" ++ if test -z "$pic_object" || test "$pic_object" = none ; then ++ arg="$non_pic_object" ++ fi ++ fi + else +! # Only an error if not doing a dry-run. +! if test -z "$run"; then +! $echo "$modename: \`$arg' is not a valid libtool object" 1>&2 +! exit 1 +! else +! # Dry-run case. +! +! # Extract subdirectory from the argument. +! xdir=`$echo "X$arg" | $Xsed -e 's%/[^/]*$%%'` +! if test "X$xdir" = "X$arg"; then +! xdir= +! else +! xdir="$xdir/" +! fi +! +! pic_object=`$echo "X${xdir}${objdir}/${arg}" | $Xsed -e "$lo2o"` +! non_pic_object=`$echo "X${xdir}${arg}" | $Xsed -e "$lo2o"` +! libobjs="$libobjs $pic_object" +! non_pic_objects="$non_pic_objects $non_pic_object" +! fi + fi + ;; + +*************** +*** 1277,1288 **** +--- 1535,1617 ---- + exit 1 + fi + ++ # Special handling for Metrowerks compiler for NetWare ++ case "$LD" in ++ mwldnlm) ++ # If building debug (-g) add internal debug symbols. ++ compile_command=`echo $compile_command | ${SED} -e 's/ -g / -g -sym internal /'` ++ ++ # When using the Metrowerks linker for NetWare, if there is a ++ # .def or .exp file with the same filename as the $output file, ++ # add it as a -commandfile to $compile_command and $linker_flags ++ # (if no -commandfile yet) ++ base=`echo $output | ${SED} 's,\(.*\)\..*$,\1,'` ++ cmd_file= ++ for ext in def exp; do ++ if test -f "$base.$ext"; then ++ cmd_file="$base.$ext" ++ break ++ fi ++ done ++ if test -n "$cmd_file"; then ++ if ! ( expr "$compile_command" : ".*-commandfile.*" > /dev/null ); then ++ compile_command="$compile_command -commandfile $cmd_file" ++ fi ++ if ! ( expr "$linker_flags" : ".*-commandfile.*" > /dev/null ); then ++ linker_flags="$linker_flags -commandfile $cmd_file" ++ fi ++ fi ++ ;; ++ esac ++ ++ # Infer tagged configuration to use if any are available and ++ # if one wasn't chosen via the "--tag" command line option. ++ # Only attempt this if the compiler in the base link ++ # command doesn't match the default compiler. ++ if test -n "$available_tags" && test -z "$tagname"; then ++ case $base_compile in ++ # Blanks in the command may have been stripped by the calling shell, ++ # but not from the CC environment variable when ltconfig was run. ++ "$CC "* | " $CC "* | "`$echo $CC` "* | " `$echo $CC` "*) ;; ++ # Blanks at the start of $base_compile will cause this to fail ++ # if we don't check for them as well. ++ *) ++ for z in $available_tags; do ++ if grep "^# ### BEGIN LIBTOOL TAG CONFIG: $z$" < "$0" > /dev/null; then ++ # Evaluate the configuration. ++ eval "`${SED} -n -e '/^# ### BEGIN LIBTOOL TAG CONFIG: '$z'$/,/^# ### END LIBTOOL TAG CONFIG: '$z'$/p' < $0`" ++ case $base_compile in ++ "$CC "* | " $CC "* | "`$echo $CC` "* | " `$echo $CC` "*) ++ # The compiler in $compile_command matches ++ # the one in the tagged configuration. ++ # Assume this is the tagged configuration we want. ++ tagname=$z ++ break ++ ;; ++ esac ++ fi ++ done ++ # If $tagname still isn't set, then no tagged configuration ++ # was found and let the user know that the "--tag" command ++ # line option must be used. ++ if test -z "$tagname"; then ++ echo "$modename: unable to infer tagged configuration" ++ echo "$modename: specify a tag with \`--tag'" 1>&2 ++ exit 1 ++ # else ++ # echo "$modename: using $tagname tagged configuration" ++ fi ++ ;; ++ esac ++ fi ++ + if test "$export_dynamic" = yes && test -n "$export_dynamic_flag_spec"; then + eval arg=\"$export_dynamic_flag_spec\" + compile_command="$compile_command $arg" + finalize_command="$finalize_command $arg" + fi + ++ oldlibs= + # calculate the name of the file, without its directory + outputname=`$echo "X$output" | $Xsed -e 's%^.*/%%'` + libobjs_save="$libobjs" +*************** +*** 1303,1313 **** + output_objdir="$output_objdir/$objdir" + fi + # Create the object directory. +! if test ! -d $output_objdir; then + $show "$mkdir $output_objdir" + $run $mkdir $output_objdir + status=$? +! if test $status -ne 0 && test ! -d $output_objdir; then + exit $status + fi + fi +--- 1632,1642 ---- + output_objdir="$output_objdir/$objdir" + fi + # Create the object directory. +! if test ! -d "$output_objdir"; then + $show "$mkdir $output_objdir" + $run $mkdir $output_objdir + status=$? +! if test "$status" -ne 0 && test ! -d "$output_objdir"; then + exit $status + fi + fi +*************** +*** 1325,1340 **** +--- 1654,1713 ---- + *) linkmode=prog ;; # Anything else should be a program. + esac + ++ case $host in ++ *cygwin*) ++ # This is a hack, but we run into problems on cygwin. ++ # libgcc.a depends on libcygwin, but gcc puts -lgcc onto ++ # the link line twice: once before the "normal" libs ++ # (-lcygwin -luser32 -lkernel32 -ladvapi32 -lshell32) and ++ # once AFTER those. However, the "eliminate dup deps" ++ # proceedure keeps only the LAST duplicate -- thus ++ # messing up the order, since after dup elimination ++ # -lgcc comes AFTER -lcygwin. In normal C operation, ++ # you don't notice the problem, because -lgcc isn't ++ # really used. However, now that C++ libraries are ++ # libtool-able, you DO see the problem. So, it must ++ # be fixed. We could always force "--preserve-dup-deps" ++ # but that could lead to other problems. So, on cygwin, ++ # always preserve dups of -lgcc...but only -lgcc. That ++ # way, the dependency order won't get corrupted. ++ specialdeplibs="-lgcc" ++ ;; ++ *) + specialdeplibs= ++ ;; ++ esac ++ + libs= + # Find all interdependent deplibs by searching for libraries + # that are linked more than once (e.g. -la -lb -la) + for deplib in $deplibs; do ++ if test "X$duplicate_deps" = "Xyes" ; then + case "$libs " in + *" $deplib "*) specialdeplibs="$specialdeplibs $deplib" ;; + esac ++ fi + libs="$libs $deplib" + done ++ ++ if test "$linkmode" = lib; then ++ libs="$predeps $libs $compiler_lib_search_path $postdeps" ++ ++ # Compute libraries that are listed more than once in $predeps ++ # $postdeps and mark them as special (i.e., whose duplicates are ++ # not to be eliminated). ++ pre_post_deps= ++ if test "X$duplicate_deps" = "Xyes" ; then ++ for pre_post_dep in $predeps $postdeps; do ++ case "$pre_post_deps " in ++ *" $pre_post_dep "*) specialdeplibs="$specialdeplibs $pre_post_deps" ;; ++ esac ++ pre_post_deps="$pre_post_deps $pre_post_dep" ++ done ++ fi ++ pre_post_deps= ++ fi ++ + deplibs= + newdependency_libs= + newlib_search_path= +*************** +*** 1366,1393 **** + ;; + esac + for pass in $passes; do +! if test $linkmode = prog; then +! # Determine which files to process +! case $pass in +! dlopen) +! libs="$dlfiles" +! save_deplibs="$deplibs" # Collect dlpreopened libraries + deplibs= +! ;; + dlpreopen) libs="$dlprefiles" ;; + link) libs="$deplibs %DEPLIBS% $dependency_libs" ;; + esac + fi + for deplib in $libs; do + lib= + found=no + case $deplib in + -l*) +! if test $linkmode = oldlib && test $linkmode = obj; then +! $echo "$modename: warning: \`-l' is ignored for archives/objects: $deplib" 1>&2 + continue + fi +! if test $pass = conv; then + deplibs="$deplib $deplibs" + continue + fi +--- 1739,1771 ---- + ;; + esac + for pass in $passes; do +! if test "$linkmode,$pass" = "lib,link" || +! test "$linkmode,$pass" = "prog,scan"; then +! libs="$deplibs" + deplibs= +! fi +! if test "$linkmode" = prog; then +! case $pass in +! dlopen) libs="$dlfiles" ;; + dlpreopen) libs="$dlprefiles" ;; + link) libs="$deplibs %DEPLIBS% $dependency_libs" ;; + esac + fi ++ if test "$pass" = dlopen; then ++ # Collect dlpreopened libraries ++ save_deplibs="$deplibs" ++ deplibs= ++ fi + for deplib in $libs; do + lib= + found=no + case $deplib in + -l*) +! if test "$linkmode" != lib && test "$linkmode" != prog; then +! $echo "$modename: warning: \`-l' is ignored for archives/objects" 1>&2 + continue + fi +! if test "$pass" = conv; then + deplibs="$deplib $deplibs" + continue + fi +*************** +*** 1407,1413 **** + finalize_deplibs="$deplib $finalize_deplibs" + else + deplibs="$deplib $deplibs" +! test $linkmode = lib && newdependency_libs="$deplib $newdependency_libs" + fi + continue + fi +--- 1785,1791 ---- + finalize_deplibs="$deplib $finalize_deplibs" + else + deplibs="$deplib $deplibs" +! test "$linkmode" = lib && newdependency_libs="$deplib $newdependency_libs" + fi + continue + fi +*************** +*** 1416,1431 **** + case $linkmode in + lib) + deplibs="$deplib $deplibs" +! test $pass = conv && continue + newdependency_libs="$deplib $newdependency_libs" + newlib_search_path="$newlib_search_path "`$echo "X$deplib" | $Xsed -e 's/^-L//'` + ;; + prog) +! if test $pass = conv; then + deplibs="$deplib $deplibs" + continue + fi +! if test $pass = scan; then + deplibs="$deplib $deplibs" + newlib_search_path="$newlib_search_path "`$echo "X$deplib" | $Xsed -e 's/^-L//'` + else +--- 1794,1809 ---- + case $linkmode in + lib) + deplibs="$deplib $deplibs" +! test "$pass" = conv && continue + newdependency_libs="$deplib $newdependency_libs" + newlib_search_path="$newlib_search_path "`$echo "X$deplib" | $Xsed -e 's/^-L//'` + ;; + prog) +! if test "$pass" = conv; then + deplibs="$deplib $deplibs" + continue + fi +! if test "$pass" = scan; then + deplibs="$deplib $deplibs" + newlib_search_path="$newlib_search_path "`$echo "X$deplib" | $Xsed -e 's/^-L//'` + else +*************** +*** 1434,1446 **** + fi + ;; + *) +! $echo "$modename: warning: \`-L' is ignored for archives/objects: $deplib" 1>&2 + ;; + esac # linkmode + continue + ;; # -L + -R*) +! if test $pass = link; then + dir=`$echo "X$deplib" | $Xsed -e 's/^-R//'` + # Make sure the xrpath contains only unique directories. + case "$xrpath " in +--- 1812,1824 ---- + fi + ;; + *) +! $echo "$modename: warning: \`-L' is ignored for archives/objects" 1>&2 + ;; + esac # linkmode + continue + ;; # -L + -R*) +! if test "$pass" = link; then + dir=`$echo "X$deplib" | $Xsed -e 's/^-R//'` + # Make sure the xrpath contains only unique directories. + case "$xrpath " in +*************** +*** 1453,1459 **** + ;; + *.la) lib="$deplib" ;; + *.$libext) +! if test $pass = conv; then + deplibs="$deplib $deplibs" + continue + fi +--- 1831,1837 ---- + ;; + *.la) lib="$deplib" ;; + *.$libext) +! if test "$pass" = conv; then + deplibs="$deplib $deplibs" + continue + fi +*************** +*** 1461,1470 **** + lib) + if test "$deplibs_check_method" != pass_all; then + echo +! echo "*** Warning: This library needs some functionality provided by $deplib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have." + else + echo + echo "*** Warning: Linking the shared library $output against the" +--- 1839,1850 ---- + lib) + if test "$deplibs_check_method" != pass_all; then + echo +! echo "*** Warning: Trying to link with static lib archive $deplib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have" +! echo "*** because the file extensions .$libext of this argument makes me believe" +! echo "*** that it is just a static archive that I should not used here." + else + echo + echo "*** Warning: Linking the shared library $output against the" +*************** +*** 1474,1480 **** + continue + ;; + prog) +! if test $pass != link; then + deplibs="$deplib $deplibs" + else + compile_deplibs="$deplib $compile_deplibs" +--- 1854,1860 ---- + continue + ;; + prog) +! if test "$pass" != link; then + deplibs="$deplib $deplibs" + else + compile_deplibs="$deplib $compile_deplibs" +*************** +*** 1485,1491 **** + esac # linkmode + ;; # *.$libext + *.lo | *.$objext) +! if test $pass = dlpreopen || test "$dlopen_support" != yes || test "$build_libtool_libs" = no; then + # If there is no dlopen support or we're linking statically, + # we need to preload. + newdlprefiles="$newdlprefiles $deplib" +--- 1865,1874 ---- + esac # linkmode + ;; # *.$libext + *.lo | *.$objext) +! if test "$pass" = conv; then +! deplibs="$deplib $deplibs" +! elif test "$linkmode" = prog; then +! if test "$pass" = dlpreopen || test "$dlopen_support" != yes || test "$build_libtool_libs" = no; then + # If there is no dlopen support or we're linking statically, + # we need to preload. + newdlprefiles="$newdlprefiles $deplib" +*************** +*** 1494,1499 **** +--- 1877,1883 ---- + else + newdlfiles="$newdlfiles $deplib" + fi ++ fi + continue + ;; + %DEPLIBS%) +*************** +*** 1501,1514 **** + continue + ;; + esac # case $deplib +! if test $found = yes || test -f "$lib"; then : + else + $echo "$modename: cannot find the library \`$lib'" 1>&2 + exit 1 + fi + + # Check to see that this really is a libtool archive. +! if (sed -e '2q' $lib | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then : + else + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + exit 1 +--- 1885,1898 ---- + continue + ;; + esac # case $deplib +! if test "$found" = yes || test -f "$lib"; then : + else + $echo "$modename: cannot find the library \`$lib'" 1>&2 + exit 1 + fi + + # Check to see that this really is a libtool archive. +! if (${SED} -e '2q' $lib | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then : + else + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + exit 1 +*************** +*** 1535,1547 **** + + if test "$linkmode,$pass" = "lib,link" || + test "$linkmode,$pass" = "prog,scan" || +! { test $linkmode = oldlib && test $linkmode = obj; }; then +! # Add dl[pre]opened files of deplib + test -n "$dlopen" && dlfiles="$dlfiles $dlopen" + test -n "$dlpreopen" && dlprefiles="$dlprefiles $dlpreopen" + fi + +! if test $pass = conv; then + # Only check for convenience libraries + deplibs="$lib $deplibs" + if test -z "$libdir"; then +--- 1919,1930 ---- + + if test "$linkmode,$pass" = "lib,link" || + test "$linkmode,$pass" = "prog,scan" || +! { test "$linkmode" != prog && test "$linkmode" != lib; }; then + test -n "$dlopen" && dlfiles="$dlfiles $dlopen" + test -n "$dlpreopen" && dlprefiles="$dlprefiles $dlpreopen" + fi + +! if test "$pass" = conv; then + # Only check for convenience libraries + deplibs="$lib $deplibs" + if test -z "$libdir"; then +*************** +*** 1555,1566 **** + tmp_libs= + for deplib in $dependency_libs; do + deplibs="$deplib $deplibs" + case "$tmp_libs " in + *" $deplib "*) specialdeplibs="$specialdeplibs $deplib" ;; + esac + tmp_libs="$tmp_libs $deplib" + done +! elif test $linkmode != prog && test $linkmode != lib; then + $echo "$modename: \`$lib' is not a convenience library" 1>&2 + exit 1 + fi +--- 1938,1951 ---- + tmp_libs= + for deplib in $dependency_libs; do + deplibs="$deplib $deplibs" ++ if test "X$duplicate_deps" = "Xyes" ; then + case "$tmp_libs " in + *" $deplib "*) specialdeplibs="$specialdeplibs $deplib" ;; + esac ++ fi + tmp_libs="$tmp_libs $deplib" + done +! elif test "$linkmode" != prog && test "$linkmode" != lib; then + $echo "$modename: \`$lib' is not a convenience library" 1>&2 + exit 1 + fi +*************** +*** 1578,1592 **** + fi + + # This library was specified with -dlopen. +! if test $pass = dlopen; then + if test -z "$libdir"; then + $echo "$modename: cannot -dlopen a convenience library: \`$lib'" 1>&2 + exit 1 + fi + if test -z "$dlname" || test "$dlopen_support" != yes || test "$build_libtool_libs" = no; then + # If there is no dlname, no dlopen support or we're linking +! # statically, we need to preload. +! dlprefiles="$dlprefiles $lib" + else + newdlfiles="$newdlfiles $lib" + fi +--- 1963,1979 ---- + fi + + # This library was specified with -dlopen. +! if test "$pass" = dlopen; then + if test -z "$libdir"; then + $echo "$modename: cannot -dlopen a convenience library: \`$lib'" 1>&2 + exit 1 + fi + if test -z "$dlname" || test "$dlopen_support" != yes || test "$build_libtool_libs" = no; then + # If there is no dlname, no dlopen support or we're linking +! # statically, we need to preload. We also need to preload any +! # dependent libraries so libltdl's deplib preloader doesn't +! # bomb out in the load deplibs phase. +! dlprefiles="$dlprefiles $lib $dependency_libs" + else + newdlfiles="$newdlfiles $lib" + fi +*************** +*** 1627,1633 **** + name=`$echo "X$laname" | $Xsed -e 's/\.la$//' -e 's/^lib//'` + + # This library was specified with -dlpreopen. +! if test $pass = dlpreopen; then + if test -z "$libdir"; then + $echo "$modename: cannot -dlpreopen a convenience library: \`$lib'" 1>&2 + exit 1 +--- 2014,2020 ---- + name=`$echo "X$laname" | $Xsed -e 's/\.la$//' -e 's/^lib//'` + + # This library was specified with -dlpreopen. +! if test "$pass" = dlpreopen; then + if test -z "$libdir"; then + $echo "$modename: cannot -dlpreopen a convenience library: \`$lib'" 1>&2 + exit 1 +*************** +*** 1646,1663 **** + + if test -z "$libdir"; then + # Link the convenience library +! if test $linkmode = lib; then + deplibs="$dir/$old_library $deplibs" + elif test "$linkmode,$pass" = "prog,link"; then + compile_deplibs="$dir/$old_library $compile_deplibs" + finalize_deplibs="$dir/$old_library $finalize_deplibs" + else +! deplibs="$lib $deplibs" + fi + continue + fi + +! if test $linkmode = prog && test $pass != link; then + newlib_search_path="$newlib_search_path $ladir" + deplibs="$lib $deplibs" + +--- 2033,2050 ---- + + if test -z "$libdir"; then + # Link the convenience library +! if test "$linkmode" = lib; then + deplibs="$dir/$old_library $deplibs" + elif test "$linkmode,$pass" = "prog,link"; then + compile_deplibs="$dir/$old_library $compile_deplibs" + finalize_deplibs="$dir/$old_library $finalize_deplibs" + else +! deplibs="$lib $deplibs" # used for prog,scan pass + fi + continue + fi + +! if test "$linkmode" = prog && test "$pass" != link; then + newlib_search_path="$newlib_search_path $ladir" + deplibs="$lib $deplibs" + +*************** +*** 1673,1700 **** + -L*) newlib_search_path="$newlib_search_path "`$echo "X$deplib" | $Xsed -e 's/^-L//'`;; ### testsuite: skip nested quoting test + esac + # Need to link against all dependency_libs? +! if test $linkalldeplibs = yes; then + deplibs="$deplib $deplibs" + else + # Need to hardcode shared library paths + # or/and link against static libraries + newdependency_libs="$deplib $newdependency_libs" + fi + case "$tmp_libs " in + *" $deplib "*) specialdeplibs="$specialdeplibs $deplib" ;; + esac + tmp_libs="$tmp_libs $deplib" + done # for deplib + continue + fi # $linkmode = prog... + +! link_static=no # Whether the deplib will be linked statically + if test -n "$library_names" && + { test "$prefer_static_libs" = no || test -z "$old_library"; }; then +! # Link against this shared library + +- if test "$linkmode,$pass" = "prog,link" || +- { test $linkmode = lib && test $hardcode_into_libs = yes; }; then + # Hardcode the library path. + # Skip directories that are in the system default run-time + # search path. +--- 2060,2095 ---- + -L*) newlib_search_path="$newlib_search_path "`$echo "X$deplib" | $Xsed -e 's/^-L//'`;; ### testsuite: skip nested quoting test + esac + # Need to link against all dependency_libs? +! if test "$linkalldeplibs" = yes; then + deplibs="$deplib $deplibs" + else + # Need to hardcode shared library paths + # or/and link against static libraries + newdependency_libs="$deplib $newdependency_libs" + fi ++ if test "X$duplicate_deps" = "Xyes" ; then + case "$tmp_libs " in + *" $deplib "*) specialdeplibs="$specialdeplibs $deplib" ;; + esac ++ fi + tmp_libs="$tmp_libs $deplib" + done # for deplib + continue + fi # $linkmode = prog... + +! if test "$linkmode,$pass" = "prog,link"; then + if test -n "$library_names" && + { test "$prefer_static_libs" = no || test -z "$old_library"; }; then +! # We need to hardcode the library path +! if test -n "$shlibpath_var"; then +! # Make sure the rpath contains only unique directories. +! case "$temp_rpath " in +! *" $dir "*) ;; +! *" $absdir "*) ;; +! *) temp_rpath="$temp_rpath $dir" ;; +! esac +! fi + + # Hardcode the library path. + # Skip directories that are in the system default run-time + # search path. +*************** +*** 1716,1732 **** + esac + ;; + esac +- if test $linkmode = prog; then +- # We need to hardcode the library path +- if test -n "$shlibpath_var"; then +- # Make sure the rpath contains only unique directories. +- case "$temp_rpath " in +- *" $dir "*) ;; +- *" $absdir "*) ;; +- *) temp_rpath="$temp_rpath $dir" ;; +- esac +- fi +- fi + fi # $linkmode,$pass = prog,link... + + if test "$alldeplibs" = yes && +--- 2111,2116 ---- +*************** +*** 1736,1746 **** +--- 2120,2159 ---- + # We only need to search for static libraries + continue + fi ++ fi + ++ link_static=no # Whether the deplib will be linked statically ++ if test -n "$library_names" && ++ { test "$prefer_static_libs" = no || test -z "$old_library"; }; then + if test "$installed" = no; then + notinst_deplibs="$notinst_deplibs $lib" + need_relink=yes + fi ++ # This is a shared library ++ if test "$linkmode" = lib && ++ test "$hardcode_into_libs" = yes; then ++ # Hardcode the library path. ++ # Skip directories that are in the system default run-time ++ # search path. ++ case " $sys_lib_dlsearch_path " in ++ *" $absdir "*) ;; ++ *) ++ case "$compile_rpath " in ++ *" $absdir "*) ;; ++ *) compile_rpath="$compile_rpath $absdir" ++ esac ++ ;; ++ esac ++ case " $sys_lib_dlsearch_path " in ++ *" $libdir "*) ;; ++ *) ++ case "$finalize_rpath " in ++ *" $libdir "*) ;; ++ *) finalize_rpath="$finalize_rpath $libdir" ++ esac ++ ;; ++ esac ++ fi + + if test -n "$old_archive_from_expsyms_cmds"; then + # figure out the soname +*************** +*** 1766,1773 **** + + # Make a new name for the extract_expsyms_cmds to use + soroot="$soname" +! soname=`echo $soroot | sed -e 's/^.*\///'` +! newlib="libimp-`echo $soname | sed 's/^lib//;s/\.dll$//'`.a" + + # If the library has no export list, then create one now + if test -f "$output_objdir/$soname-def"; then : +--- 2179,2186 ---- + + # Make a new name for the extract_expsyms_cmds to use + soroot="$soname" +! soname=`echo $soroot | ${SED} -e 's/^.*\///'` +! newlib="libimp-`echo $soname | ${SED} 's/^lib//;s/\.dll$//'`.a" + + # If the library has no export list, then create one now + if test -f "$output_objdir/$soname-def"; then : +*************** +*** 1798,1806 **** + # make sure the library variables are pointing to the new library + dir=$output_objdir + linklib=$newlib +! fi # test -n $old_archive_from_expsyms_cmds + +! if test $linkmode = prog || test "$mode" != relink; then + add_shlibpath= + add_dir= + add= +--- 2211,2219 ---- + # make sure the library variables are pointing to the new library + dir=$output_objdir + linklib=$newlib +! fi # test -n "$old_archive_from_expsyms_cmds" + +! if test "$linkmode" = prog || test "$mode" != relink; then + add_shlibpath= + add_dir= + add= +*************** +*** 1808,1813 **** +--- 2221,2229 ---- + case $hardcode_action in + immediate | unsupported) + if test "$hardcode_direct" = no; then ++ case $host in ++ *-*-sco3.2v5* ) add_dir="-L$dir" ;; ++ esac + add="$dir/$linklib" + elif test "$hardcode_minus_L" = no; then + case $host in +*************** +*** 1849,1855 **** + *) compile_shlibpath="$compile_shlibpath$add_shlibpath:" ;; + esac + fi +! if test $linkmode = prog; then + test -n "$add_dir" && compile_deplibs="$add_dir $compile_deplibs" + test -n "$add" && compile_deplibs="$add $compile_deplibs" + else +--- 2265,2271 ---- + *) compile_shlibpath="$compile_shlibpath$add_shlibpath:" ;; + esac + fi +! if test "$linkmode" = prog; then + test -n "$add_dir" && compile_deplibs="$add_dir $compile_deplibs" + test -n "$add" && compile_deplibs="$add $compile_deplibs" + else +*************** +*** 1866,1872 **** + fi + fi + +! if test $linkmode = prog || test "$mode" = relink; then + add_shlibpath= + add_dir= + add= +--- 2282,2288 ---- + fi + fi + +! if test "$linkmode" = prog || test "$mode" = relink; then + add_shlibpath= + add_dir= + add= +*************** +*** 1884,1898 **** + add="-l$name" + else + # We cannot seem to hardcode it, guess we'll fake it. +- if test "X$installed" = Xyes; then + add_dir="-L$libdir" +- else +- add_dir="-L$DESTDIR$libdir" +- fi + add="-l$name" + fi + +! if test $linkmode = prog; then + test -n "$add_dir" && finalize_deplibs="$add_dir $finalize_deplibs" + test -n "$add" && finalize_deplibs="$add $finalize_deplibs" + else +--- 2300,2310 ---- + add="-l$name" + else + # We cannot seem to hardcode it, guess we'll fake it. + add_dir="-L$libdir" + add="-l$name" + fi + +! if test "$linkmode" = prog; then + test -n "$add_dir" && finalize_deplibs="$add_dir $finalize_deplibs" + test -n "$add" && finalize_deplibs="$add $finalize_deplibs" + else +*************** +*** 1900,1915 **** + test -n "$add" && deplibs="$add $deplibs" + fi + fi +! elif test $linkmode = prog; then +! if test "$alldeplibs" = yes && +! { test "$deplibs_check_method" = pass_all || +! { test "$build_libtool_libs" = yes && +! test -n "$library_names"; }; }; then +! # We only need to search for static libraries +! continue +! fi +! +! # Try to link the static library + # Here we assume that one of hardcode_direct or hardcode_minus_L + # is not unsupported. This is valid on all known static and + # shared platforms. +--- 2312,2318 ---- + test -n "$add" && deplibs="$add $deplibs" + fi + fi +! elif test "$linkmode" = prog; then + # Here we assume that one of hardcode_direct or hardcode_minus_L + # is not unsupported. This is valid on all known static and + # shared platforms. +*************** +*** 1930,1942 **** + # Just print a warning and add the library to dependency_libs so + # that the program can be linked against the static library. + echo +! echo "*** Warning: This library needs some functionality provided by $lib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" + echo "*** shared version of the library, which you do not appear to have." + if test "$module" = yes; then +! echo "*** Therefore, libtool will create a static module, that should work " +! echo "*** as long as the dlopening application is linked with the -dlopen flag." + if test -z "$global_symbol_pipe"; then + echo + echo "*** However, this would only work if libtool was able to extract symbol" +--- 2333,2346 ---- + # Just print a warning and add the library to dependency_libs so + # that the program can be linked against the static library. + echo +! echo "*** Warning: This system can not link to static lib archive $lib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" + echo "*** shared version of the library, which you do not appear to have." + if test "$module" = yes; then +! echo "*** But as you try to build a module library, libtool will still create " +! echo "*** a static module, that should work as long as the dlopening application" +! echo "*** is linked with the -dlopen flag to resolve symbols at runtime." + if test -z "$global_symbol_pipe"; then + echo + echo "*** However, this would only work if libtool was able to extract symbol" +*************** +*** 1959,1968 **** + fi + fi # link shared/static library? + +! if test $linkmode = lib; then + if test -n "$dependency_libs" && +! { test $hardcode_into_libs != yes || test $build_old_libs = yes || +! test $link_static = yes; }; then + # Extract -R from dependency_libs + temp_deplibs= + for libdir in $dependency_libs; do +--- 2363,2372 ---- + fi + fi # link shared/static library? + +! if test "$linkmode" = lib; then + if test -n "$dependency_libs" && +! { test "$hardcode_into_libs" != yes || test "$build_old_libs" = yes || +! test "$link_static" = yes; }; then + # Extract -R from dependency_libs + temp_deplibs= + for libdir in $dependency_libs; do +*************** +*** 1985,1997 **** + tmp_libs= + for deplib in $dependency_libs; do + newdependency_libs="$deplib $newdependency_libs" + case "$tmp_libs " in + *" $deplib "*) specialdeplibs="$specialdeplibs $deplib" ;; + esac + tmp_libs="$tmp_libs $deplib" + done + +! if test $link_all_deplibs != no; then + # Add the search paths of all dependency libraries + for deplib in $dependency_libs; do + case $deplib in +--- 2389,2403 ---- + tmp_libs= + for deplib in $dependency_libs; do + newdependency_libs="$deplib $newdependency_libs" ++ if test "X$duplicate_deps" = "Xyes" ; then + case "$tmp_libs " in + *" $deplib "*) specialdeplibs="$specialdeplibs $deplib" ;; + esac ++ fi + tmp_libs="$tmp_libs $deplib" + done + +! if test "$link_all_deplibs" != no; then + # Add the search paths of all dependency libraries + for deplib in $dependency_libs; do + case $deplib in +*************** +*** 2013,2019 **** + if grep "^installed=no" $deplib > /dev/null; then + path="-L$absdir/$objdir" + else +! eval libdir=`sed -n -e 's/^libdir=\(.*\)$/\1/p' $deplib` + if test -z "$libdir"; then + $echo "$modename: \`$deplib' is not a valid libtool archive" 1>&2 + exit 1 +--- 2419,2425 ---- + if grep "^installed=no" $deplib > /dev/null; then + path="-L$absdir/$objdir" + else +! eval libdir=`${SED} -n -e 's/^libdir=\(.*\)$/\1/p' $deplib` + if test -z "$libdir"; then + $echo "$modename: \`$deplib' is not a valid libtool archive" 1>&2 + exit 1 +*************** +*** 2034,2048 **** + fi # link_all_deplibs != no + fi # linkmode = lib + done # for deplib in $libs +! if test $pass = dlpreopen; then + # Link the dlpreopened libraries before other libraries + for deplib in $save_deplibs; do + deplibs="$deplib $deplibs" + done + fi +! if test $pass != dlopen; then +! test $pass != scan && dependency_libs="$newdependency_libs" +! if test $pass != conv; then + # Make sure lib_search_path contains only unique directories. + lib_search_path= + for dir in $newlib_search_path; do +--- 2440,2454 ---- + fi # link_all_deplibs != no + fi # linkmode = lib + done # for deplib in $libs +! dependency_libs="$newdependency_libs" +! if test "$pass" = dlpreopen; then + # Link the dlpreopened libraries before other libraries + for deplib in $save_deplibs; do + deplibs="$deplib $deplibs" + done + fi +! if test "$pass" != dlopen; then +! if test "$pass" != conv; then + # Make sure lib_search_path contains only unique directories. + lib_search_path= + for dir in $newlib_search_path; do +*************** +*** 2064,2072 **** +--- 2470,2498 ---- + eval tmp_libs=\"\$$var\" + new_libs= + for deplib in $tmp_libs; do ++ # FIXME: Pedantically, this is the right thing to do, so ++ # that some nasty dependency loop isn't accidentally ++ # broken: ++ #new_libs="$deplib $new_libs" ++ # Pragmatically, this seems to cause very few problems in ++ # practice: + case $deplib in + -L*) new_libs="$deplib $new_libs" ;; + *) ++ # And here is the reason: when a library appears more ++ # than once as an explicit dependence of a library, or ++ # is implicitly linked in more than once by the ++ # compiler, it is considered special, and multiple ++ # occurrences thereof are not removed. Compare this ++ # with having the same library being listed as a ++ # dependency of multiple other libraries: in this case, ++ # we know (pedantically, we assume) the library does not ++ # need to be listed more than once, so we keep only the ++ # last copy. This is not always right, but it is rare ++ # enough that we require users that really mean to play ++ # such unportable linking tricks to link the library ++ # using -Wl,-lname, so that libtool does not consider it ++ # for duplicate removal. + case " $specialdeplibs " in + *" $deplib "*) new_libs="$deplib $new_libs" ;; + *) +*************** +*** 2094,2112 **** + eval $var=\"$tmp_libs\" + done # for var + fi +- if test "$pass" = "conv" && +- { test "$linkmode" = "lib" || test "$linkmode" = "prog"; }; then +- libs="$deplibs" # reset libs +- deplibs= +- fi + done # for pass +! if test $linkmode = prog; then + dlfiles="$newdlfiles" + dlprefiles="$newdlprefiles" + fi + + case $linkmode in + oldlib) + if test -n "$dlfiles$dlprefiles" || test "$dlself" != no; then + $echo "$modename: warning: \`-dlopen' is ignored for archives" 1>&2 + fi +--- 2520,2537 ---- + eval $var=\"$tmp_libs\" + done # for var + fi + done # for pass +! if test "$linkmode" = prog; then + dlfiles="$newdlfiles" + dlprefiles="$newdlprefiles" + fi + + case $linkmode in + oldlib) ++ if test -n "$deplibs"; then ++ $echo "$modename: warning: \`-l' and \`-L' are ignored for archives" 1>&2 ++ fi ++ + if test -n "$dlfiles$dlprefiles" || test "$dlself" != no; then + $echo "$modename: warning: \`-dlopen' is ignored for archives" 1>&2 + fi +*************** +*** 2177,2183 **** + fi + + set dummy $rpath +! if test $# -gt 2; then + $echo "$modename: warning: ignoring multiple \`-rpath's for a libtool library" 1>&2 + fi + install_libdir="$2" +--- 2602,2608 ---- + fi + + set dummy $rpath +! if test "$#" -gt 2; then + $echo "$modename: warning: ignoring multiple \`-rpath's for a libtool library" 1>&2 + fi + install_libdir="$2" +*************** +*** 2186,2192 **** + if test -z "$rpath"; then + if test "$build_libtool_libs" = yes; then + # Building a libtool convenience library. +! libext=al + oldlibs="$output_objdir/$libname.$libext $oldlibs" + build_libtool_libs=convenience + build_old_libs=yes +--- 2611,2619 ---- + if test -z "$rpath"; then + if test "$build_libtool_libs" = yes; then + # Building a libtool convenience library. +! # Some compilers have problems with a `.al' extension so +! # convenience libraries should have the same extension an +! # archive normally would. + oldlibs="$output_objdir/$libname.$libext $oldlibs" + build_libtool_libs=convenience + build_old_libs=yes +*************** +*** 2244,2250 **** + ;; + esac + +! if test $age -gt $current; then + $echo "$modename: AGE \`$age' is greater than the current interface number \`$current'" 1>&2 + $echo "$modename: \`$vinfo' is not valid version information" 1>&2 + exit 1 +--- 2671,2677 ---- + ;; + esac + +! if test "$age" -gt "$current"; then + $echo "$modename: AGE \`$age' is greater than the current interface number \`$current'" 1>&2 + $echo "$modename: \`$vinfo' is not valid version information" 1>&2 + exit 1 +*************** +*** 2277,2292 **** + versuffix=".$current"; + ;; + +! irix) + major=`expr $current - $age + 1` +! verstring="sgi$major.$revision" + + # Add in all the interfaces that we are compatible with. + loop=$revision +! while test $loop != 0; do + iface=`expr $revision - $loop` + loop=`expr $loop - 1` +! verstring="sgi$major.$iface:$verstring" + done + + # Before this point, $major must not contain `.'. +--- 2704,2724 ---- + versuffix=".$current"; + ;; + +! irix | nonstopux) + major=`expr $current - $age + 1` +! +! case $version_type in +! nonstopux) verstring_prefix=nonstopux ;; +! *) verstring_prefix=sgi ;; +! esac +! verstring="$verstring_prefix$major.$revision" + + # Add in all the interfaces that we are compatible with. + loop=$revision +! while test "$loop" -ne 0; do + iface=`expr $revision - $loop` + loop=`expr $loop - 1` +! verstring="$verstring_prefix$major.$iface:$verstring" + done + + # Before this point, $major must not contain `.'. +*************** +*** 2306,2312 **** + + # Add in all the interfaces that we are compatible with. + loop=$age +! while test $loop != 0; do + iface=`expr $current - $loop` + loop=`expr $loop - 1` + verstring="$verstring:${iface}.0" +--- 2738,2744 ---- + + # Add in all the interfaces that we are compatible with. + loop=$age +! while test "$loop" -ne 0; do + iface=`expr $current - $loop` + loop=`expr $loop - 1` + verstring="$verstring:${iface}.0" +*************** +*** 2338,2349 **** + # Clear the version info if we defaulted, and they specified a release. + if test -z "$vinfo" && test -n "$release"; then + major= +- verstring="0.0" + case $version_type in + darwin) + # we can't check for "0.0" in archive_cmds due to quoting + # problems, so we reset it completely +! verstring="" + ;; + *) + verstring="0.0" +--- 2770,2780 ---- + # Clear the version info if we defaulted, and they specified a release. + if test -z "$vinfo" && test -n "$release"; then + major= + case $version_type in + darwin) + # we can't check for "0.0" in archive_cmds due to quoting + # problems, so we reset it completely +! verstring= + ;; + *) + verstring="0.0" +*************** +*** 2377,2385 **** + fi + + if test "$mode" != relink; then +! # Remove our outputs. +! $show "${rm}r $output_objdir/$outputname $output_objdir/$libname.* $output_objdir/${libname}${release}.*" +! $run ${rm}r $output_objdir/$outputname $output_objdir/$libname.* $output_objdir/${libname}${release}.* + fi + + # Now set the variables for building old libraries. +--- 2808,2831 ---- + fi + + if test "$mode" != relink; then +! # Remove our outputs, but don't remove object files since they +! # may have been created when compiling PIC objects. +! removelist= +! tempremovelist=`echo "$output_objdir/*"` +! for p in $tempremovelist; do +! case $p in +! *.$objext) +! ;; +! $output_objdir/$outputname | $output_objdir/$libname.* | $output_objdir/${libname}${release}.*) +! removelist="$removelist $p" +! ;; +! *) ;; +! esac +! done +! if test -n "$removelist"; then +! $show "${rm}r $removelist" +! $run ${rm}r $removelist +! fi + fi + + # Now set the variables for building old libraries. +*************** +*** 2392,2400 **** + + # Eliminate all temporary directories. + for path in $notinst_path; do +! lib_search_path=`echo "$lib_search_path " | sed -e 's% $path % %g'` +! deplibs=`echo "$deplibs " | sed -e 's% -L$path % %g'` +! dependency_libs=`echo "$dependency_libs " | sed -e 's% -L$path % %g'` + done + + if test -n "$xrpath"; then +--- 2838,2846 ---- + + # Eliminate all temporary directories. + for path in $notinst_path; do +! lib_search_path=`echo "$lib_search_path " | ${SED} -e 's% $path % %g'` +! deplibs=`echo "$deplibs " | ${SED} -e 's% -L$path % %g'` +! dependency_libs=`echo "$dependency_libs " | ${SED} -e 's% -L$path % %g'` + done + + if test -n "$xrpath"; then +*************** +*** 2407,2413 **** + *) finalize_rpath="$finalize_rpath $libdir" ;; + esac + done +! if test $hardcode_into_libs != yes || test $build_old_libs = yes; then + dependency_libs="$temp_xrpath $dependency_libs" + fi + fi +--- 2853,2859 ---- + *) finalize_rpath="$finalize_rpath $libdir" ;; + esac + done +! if test "$hardcode_into_libs" != yes || test "$build_old_libs" = yes; then + dependency_libs="$temp_xrpath $dependency_libs" + fi + fi +*************** +*** 2445,2456 **** + *-*-netbsd*) + # Don't link with libc until the a.out ld.so is fixed. + ;; +! *-*-openbsd*) + # Do not include libc due to us having libc/libc_r. + ;; + *) + # Add libc to deplibs on all other systems if necessary. +! if test $build_libtool_need_lc = "yes"; then + deplibs="$deplibs -lc" + fi + ;; +--- 2891,2903 ---- + *-*-netbsd*) + # Don't link with libc until the a.out ld.so is fixed. + ;; +! *-*-openbsd* | *-*-freebsd*) + # Do not include libc due to us having libc/libc_r. ++ test "X$arg" = "X-lc" && continue + ;; + *) + # Add libc to deplibs on all other systems if necessary. +! if test "$build_libtool_need_lc" = "yes"; then + deplibs="$deplibs -lc" + fi + ;; +*************** +*** 2490,2502 **** + int main() { return 0; } + EOF + $rm conftest +! $CC -o conftest conftest.c $deplibs +! if test $? -eq 0 ; then + ldd_output=`ldd conftest` + for i in $deplibs; do + name="`expr $i : '-l\(.*\)'`" + # If $name is empty we are operating on a -L argument. +! if test -n "$name" && test "$name" != "0"; then + libname=`eval \\$echo \"$libname_spec\"` + deplib_matches=`eval \\$echo \"$library_names_spec\"` + set dummy $deplib_matches +--- 2937,2949 ---- + int main() { return 0; } + EOF + $rm conftest +! $LTCC -o conftest conftest.c $deplibs +! if test "$?" -eq 0 ; then + ldd_output=`ldd conftest` + for i in $deplibs; do + name="`expr $i : '-l\(.*\)'`" + # If $name is empty we are operating on a -L argument. +! if test "$name" != "" && test "$name" -ne "0"; then + libname=`eval \\$echo \"$libname_spec\"` + deplib_matches=`eval \\$echo \"$library_names_spec\"` + set dummy $deplib_matches +*************** +*** 2506,2531 **** + else + droppeddeps=yes + echo +! echo "*** Warning: This library needs some functionality provided by $i." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have." + fi + else + newdeplibs="$newdeplibs $i" + fi + done + else +! # Error occured in the first compile. Let's try to salvage the situation: +! # Compile a seperate program for each library. + for i in $deplibs; do + name="`expr $i : '-l\(.*\)'`" + # If $name is empty we are operating on a -L argument. +! if test -n "$name" && test "$name" != "0"; then + $rm conftest +! $CC -o conftest conftest.c $i + # Did it work? +! if test $? -eq 0 ; then + ldd_output=`ldd conftest` + libname=`eval \\$echo \"$libname_spec\"` + deplib_matches=`eval \\$echo \"$library_names_spec\"` +--- 2953,2980 ---- + else + droppeddeps=yes + echo +! echo "*** Warning: dynamic linker does not accept needed library $i." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which I believe you do not have" +! echo "*** because a test_compile did reveal that the linker did not use it for" +! echo "*** its dynamic dependency list that programs get resolved with at runtime." + fi + else + newdeplibs="$newdeplibs $i" + fi + done + else +! # Error occured in the first compile. Let's try to salvage +! # the situation: Compile a separate program for each library. + for i in $deplibs; do + name="`expr $i : '-l\(.*\)'`" + # If $name is empty we are operating on a -L argument. +! if test "$name" != "" && test "$name" != "0"; then + $rm conftest +! $LTCC -o conftest conftest.c $i + # Did it work? +! if test "$?" -eq 0 ; then + ldd_output=`ldd conftest` + libname=`eval \\$echo \"$libname_spec\"` + deplib_matches=`eval \\$echo \"$library_names_spec\"` +*************** +*** 2536,2545 **** + else + droppeddeps=yes + echo +! echo "*** Warning: This library needs some functionality provided by $i." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have." + fi + else + droppeddeps=yes +--- 2985,2996 ---- + else + droppeddeps=yes + echo +! echo "*** Warning: dynamic linker does not accept needed library $i." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have" +! echo "*** because a test_compile did reveal that the linker did not use this one" +! echo "*** as a dynamic dependency that programs can get resolved with at runtime." + fi + else + droppeddeps=yes +*************** +*** 2561,2567 **** + for a_deplib in $deplibs; do + name="`expr $a_deplib : '-l\(.*\)'`" + # If $name is empty we are operating on a -L argument. +! if test -n "$name" && test "$name" != "0"; then + libname=`eval \\$echo \"$libname_spec\"` + for i in $lib_search_path $sys_lib_search_path $shlib_search_path; do + potential_libs=`ls $i/$libname[.-]* 2>/dev/null` +--- 3012,3018 ---- + for a_deplib in $deplibs; do + name="`expr $a_deplib : '-l\(.*\)'`" + # If $name is empty we are operating on a -L argument. +! if test "$name" != "" && test "$name" != "0"; then + libname=`eval \\$echo \"$libname_spec\"` + for i in $lib_search_path $sys_lib_search_path $shlib_search_path; do + potential_libs=`ls $i/$libname[.-]* 2>/dev/null` +*************** +*** 2578,2591 **** + # but so what? + potlib="$potent_lib" + while test -h "$potlib" 2>/dev/null; do +! potliblink=`ls -ld $potlib | sed 's/.* -> //'` + case $potliblink in + [\\/]* | [A-Za-z]:[\\/]*) potlib="$potliblink";; + *) potlib=`$echo "X$potlib" | $Xsed -e 's,[^/]*$,,'`"$potliblink";; + esac + done + if eval $file_magic_cmd \"\$potlib\" 2>/dev/null \ +! | sed 10q \ + | egrep "$file_magic_regex" > /dev/null; then + newdeplibs="$newdeplibs $a_deplib" + a_deplib="" +--- 3029,3042 ---- + # but so what? + potlib="$potent_lib" + while test -h "$potlib" 2>/dev/null; do +! potliblink=`ls -ld $potlib | ${SED} 's/.* -> //'` + case $potliblink in + [\\/]* | [A-Za-z]:[\\/]*) potlib="$potliblink";; + *) potlib=`$echo "X$potlib" | $Xsed -e 's,[^/]*$,,'`"$potliblink";; + esac + done + if eval $file_magic_cmd \"\$potlib\" 2>/dev/null \ +! | ${SED} 10q \ + | egrep "$file_magic_regex" > /dev/null; then + newdeplibs="$newdeplibs $a_deplib" + a_deplib="" +*************** +*** 2596,2605 **** + if test -n "$a_deplib" ; then + droppeddeps=yes + echo +! echo "*** Warning: This library needs some functionality provided by $a_deplib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have." + fi + else + # Add a -L argument. +--- 3047,3063 ---- + if test -n "$a_deplib" ; then + droppeddeps=yes + echo +! echo "*** Warning: linker path does not have real file for library $a_deplib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have" +! echo "*** because I did check the linker path looking for a file starting" +! if test -z "$potlib" ; then +! echo "*** with $libname but no candidates were found. (...for file magic test)" +! else +! echo "*** with $libname and none of the candidates passed a file format test" +! echo "*** using a file magic. Last file checked: $potlib" +! fi + fi + else + # Add a -L argument. +*************** +*** 2618,2625 **** + for i in $lib_search_path $sys_lib_search_path $shlib_search_path; do + potential_libs=`ls $i/$libname[.-]* 2>/dev/null` + for potent_lib in $potential_libs; do + if eval echo \"$potent_lib\" 2>/dev/null \ +! | sed 10q \ + | egrep "$match_pattern_regex" > /dev/null; then + newdeplibs="$newdeplibs $a_deplib" + a_deplib="" +--- 3076,3084 ---- + for i in $lib_search_path $sys_lib_search_path $shlib_search_path; do + potential_libs=`ls $i/$libname[.-]* 2>/dev/null` + for potent_lib in $potential_libs; do ++ potlib="$potent_lib" # see symlink-check above in file_magic test + if eval echo \"$potent_lib\" 2>/dev/null \ +! | ${SED} 10q \ + | egrep "$match_pattern_regex" > /dev/null; then + newdeplibs="$newdeplibs $a_deplib" + a_deplib="" +*************** +*** 2630,2639 **** + if test -n "$a_deplib" ; then + droppeddeps=yes + echo +! echo "*** Warning: This library needs some functionality provided by $a_deplib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have." + fi + else + # Add a -L argument. +--- 3089,3105 ---- + if test -n "$a_deplib" ; then + droppeddeps=yes + echo +! echo "*** Warning: linker path does not have real file for library $a_deplib." + echo "*** I have the capability to make that library automatically link in when" + echo "*** you link to this library. But I can only do this if you have a" +! echo "*** shared version of the library, which you do not appear to have" +! echo "*** because I did check the linker path looking for a file starting" +! if test -z "$potlib" ; then +! echo "*** with $libname but no candidates were found. (...for regex pattern test)" +! else +! echo "*** with $libname and none of the candidates passed a file format test" +! echo "*** using a regex pattern. Last file checked: $potlib" +! fi + fi + else + # Add a -L argument. +*************** +*** 2696,2702 **** + echo "*** automatically added whenever a program is linked with this library" + echo "*** or is declared to -dlopen it." + +! if test $allow_undefined = no; then + echo + echo "*** Since this library must not contain undefined symbols," + echo "*** because either the platform does not support them or" +--- 3162,3168 ---- + echo "*** automatically added whenever a program is linked with this library" + echo "*** or is declared to -dlopen it." + +! if test "$allow_undefined" = no; then + echo + echo "*** Since this library must not contain undefined symbols," + echo "*** because either the platform does not support them or" +*************** +*** 2723,2729 **** + + # Test again, we may have decided not to build it any more + if test "$build_libtool_libs" = yes; then +! if test $hardcode_into_libs = yes; then + # Hardcode the library paths + hardcode_libdirs= + dep_rpath= +--- 3189,3195 ---- + + # Test again, we may have decided not to build it any more + if test "$build_libtool_libs" = yes; then +! if test "$hardcode_into_libs" = yes; then + # Hardcode the library paths + hardcode_libdirs= + dep_rpath= +*************** +*** 2789,2795 **** + else + soname="$realname" + fi +! test -z "$dlname" && dlname=$soname + + lib="$output_objdir/$realname" + for link +--- 3255,3263 ---- + else + soname="$realname" + fi +! if test -z "$dlname"; then +! dlname=$soname +! fi + + lib="$output_objdir/$realname" + for link +*************** +*** 2797,2819 **** + linknames="$linknames $link" + done + +- # Ensure that we have .o objects for linkers which dislike .lo +- # (e.g. aix) in case we are running --disable-static +- for obj in $libobjs; do +- xdir=`$echo "X$obj" | $Xsed -e 's%/[^/]*$%%'` +- if test "X$xdir" = "X$obj"; then +- xdir="." +- else +- xdir="$xdir" +- fi +- baseobj=`$echo "X$obj" | $Xsed -e 's%^.*/%%'` +- oldobj=`$echo "X$baseobj" | $Xsed -e "$lo2o"` +- if test ! -f $xdir/$oldobj; then +- $show "(cd $xdir && ${LN_S} $baseobj $oldobj)" +- $run eval '(cd $xdir && ${LN_S} $baseobj $oldobj)' || exit $? +- fi +- done +- + # Use standard objects if they are pic + test -z "$pic_flag" && libobjs=`$echo "X$libobjs" | $SP2NL | $Xsed -e "$lo2o" | $NL2SP` + +--- 3265,3270 ---- +*************** +*** 2827,2834 **** +--- 3278,3293 ---- + save_ifs="$IFS"; IFS='~' + for cmd in $cmds; do + IFS="$save_ifs" ++ if len=`expr "X$cmd" : ".*"` && ++ test "$len" -le "$max_cmd_len" || test "$max_cmd_len" -le -1; then + $show "$cmd" + $run eval "$cmd" || exit $? ++ skipped_export=false ++ else ++ # The command line is too long to execute in one step. ++ $show "using reloadable object file for export list..." ++ skipped_export=: ++ fi + done + IFS="$save_ifs" + if test -n "$export_symbols_regex"; then +*************** +*** 2846,2860 **** + + if test -n "$convenience"; then + if test -n "$whole_archive_flag_spec"; then + eval libobjs=\"\$libobjs $whole_archive_flag_spec\" + else + gentop="$output_objdir/${outputname}x" + $show "${rm}r $gentop" + $run ${rm}r "$gentop" +! $show "mkdir $gentop" +! $run mkdir "$gentop" + status=$? +! if test $status -ne 0 && test ! -d "$gentop"; then + exit $status + fi + generated="$generated $gentop" +--- 3305,3320 ---- + + if test -n "$convenience"; then + if test -n "$whole_archive_flag_spec"; then ++ save_libobjs=$libobjs + eval libobjs=\"\$libobjs $whole_archive_flag_spec\" + else + gentop="$output_objdir/${outputname}x" + $show "${rm}r $gentop" + $run ${rm}r "$gentop" +! $show "$mkdir $gentop" +! $run $mkdir "$gentop" + status=$? +! if test "$status" -ne 0 && test ! -d "$gentop"; then + exit $status + fi + generated="$generated $gentop" +*************** +*** 2870,2885 **** + + $show "${rm}r $xdir" + $run ${rm}r "$xdir" +! $show "mkdir $xdir" +! $run mkdir "$xdir" + status=$? +! if test $status -ne 0 && test ! -d "$xdir"; then + exit $status + fi + $show "(cd $xdir && $AR x $xabs)" + $run eval "(cd \$xdir && $AR x \$xabs)" || exit $? + +! libobjs="$libobjs "`find $xdir -name \*.o -print -o -name \*.lo -print | $NL2SP` + done + fi + fi +--- 3330,3345 ---- + + $show "${rm}r $xdir" + $run ${rm}r "$xdir" +! $show "$mkdir $xdir" +! $run $mkdir "$xdir" + status=$? +! if test "$status" -ne 0 && test ! -d "$xdir"; then + exit $status + fi + $show "(cd $xdir && $AR x $xabs)" + $run eval "(cd \$xdir && $AR x \$xabs)" || exit $? + +! libobjs="$libobjs "`find $xdir -name \*.$objext -print -o -name \*.lo -print | $NL2SP` + done + fi + fi +*************** +*** 2898,2905 **** +--- 3358,3488 ---- + if test -n "$export_symbols" && test -n "$archive_expsym_cmds"; then + eval cmds=\"$archive_expsym_cmds\" + else ++ save_deplibs="$deplibs" ++ for conv in $convenience; do ++ tmp_deplibs= ++ for test_deplib in $deplibs; do ++ if test "$test_deplib" != "$conv"; then ++ tmp_deplibs="$tmp_deplibs $test_deplib" ++ fi ++ done ++ deplibs="$tmp_deplibs" ++ done ++ eval cmds=\"$archive_cmds\" ++ deplibs="$save_deplibs" ++ fi ++ ++ if test "X$skipped_export" != "X:" && len=`expr "X$cmds" : ".*"` && ++ test "$len" -le "$max_cmd_len" || test "$max_cmd_len" -le -1; then ++ : ++ else ++ # The command line is too long to link in one step, link piecewise. ++ $echo "creating reloadable object files..." ++ ++ # Save the value of $output and $libobjs because we want to ++ # use them later. If we have whole_archive_flag_spec, we ++ # want to use save_libobjs as it was before ++ # whole_archive_flag_spec was expanded, because we can't ++ # assume the linker understands whole_archive_flag_spec. ++ # This may have to be revisited, in case too many ++ # convenience libraries get linked in and end up exceeding ++ # the spec. ++ if test -z "$convenience" || test -z "$whole_archive_flag_spec"; then ++ save_libobjs=$libobjs ++ fi ++ save_output=$output ++ ++ # Clear the reloadable object creation command queue and ++ # initialize k to one. ++ test_cmds= ++ concat_cmds= ++ objlist= ++ delfiles= ++ last_robj= ++ k=1 ++ output=$output_objdir/$save_output-${k}.$objext ++ # Loop over the list of objects to be linked. ++ for obj in $save_libobjs ++ do ++ eval test_cmds=\"$reload_cmds $objlist $last_robj\" ++ if test "X$objlist" = X || ++ { len=`expr "X$test_cmds" : ".*"` && ++ test "$len" -le "$max_cmd_len"; }; then ++ objlist="$objlist $obj" ++ else ++ # The command $test_cmds is almost too long, add a ++ # command to the queue. ++ if test "$k" -eq 1 ; then ++ # The first file doesn't have a previous command to add. ++ eval concat_cmds=\"$reload_cmds $objlist $last_robj\" ++ else ++ # All subsequent reloadable object files will link in ++ # the last one created. ++ eval concat_cmds=\"\$concat_cmds~$reload_cmds $objlist $last_robj\" ++ fi ++ last_robj=$output_objdir/$save_output-${k}.$objext ++ k=`expr $k + 1` ++ output=$output_objdir/$save_output-${k}.$objext ++ objlist=$obj ++ len=1 ++ fi ++ done ++ # Handle the remaining objects by creating one last ++ # reloadable object file. All subsequent reloadable object ++ # files will link in the last one created. ++ test -z "$concat_cmds" || concat_cmds=$concat_cmds~ ++ eval concat_cmds=\"\${concat_cmds}$reload_cmds $objlist $last_robj\" ++ ++ if ${skipped_export-false}; then ++ $show "generating symbol list for \`$libname.la'" ++ export_symbols="$output_objdir/$libname.exp" ++ $run $rm $export_symbols ++ libobjs=$output ++ # Append the command to create the export file. ++ eval concat_cmds=\"\$concat_cmds~$export_symbols_cmds\" ++ fi ++ ++ # Set up a command to remove the reloadale object files ++ # after they are used. ++ i=0 ++ while test "$i" -lt "$k" ++ do ++ i=`expr $i + 1` ++ delfiles="$delfiles $output_objdir/$save_output-${i}.$objext" ++ done ++ ++ $echo "creating a temporary reloadable object file: $output" ++ ++ # Loop through the commands generated above and execute them. ++ save_ifs="$IFS"; IFS='~' ++ for cmd in $concat_cmds; do ++ IFS="$save_ifs" ++ $show "$cmd" ++ $run eval "$cmd" || exit $? ++ done ++ IFS="$save_ifs" ++ ++ libobjs=$output ++ # Restore the value of output. ++ output=$save_output ++ ++ if test -n "$convenience" && test -n "$whole_archive_flag_spec"; then ++ eval libobjs=\"\$libobjs $whole_archive_flag_spec\" ++ fi ++ # Expand the library linking commands again to reset the ++ # value of $libobjs for piecewise linking. ++ ++ # Do each of the archive commands. ++ if test -n "$export_symbols" && test -n "$archive_expsym_cmds"; then ++ eval cmds=\"$archive_expsym_cmds\" ++ else + eval cmds=\"$archive_cmds\" + fi ++ ++ # Append the command to remove the reloadable object files ++ # to the just-reset $cmds. ++ eval cmds=\"\$cmds~$rm $delfiles\" ++ fi + save_ifs="$IFS"; IFS='~' + for cmd in $cmds; do + IFS="$save_ifs" +*************** +*** 2990,2999 **** + gentop="$output_objdir/${obj}x" + $show "${rm}r $gentop" + $run ${rm}r "$gentop" +! $show "mkdir $gentop" +! $run mkdir "$gentop" + status=$? +! if test $status -ne 0 && test ! -d "$gentop"; then + exit $status + fi + generated="$generated $gentop" +--- 3573,3582 ---- + gentop="$output_objdir/${obj}x" + $show "${rm}r $gentop" + $run ${rm}r "$gentop" +! $show "$mkdir $gentop" +! $run $mkdir "$gentop" + status=$? +! if test "$status" -ne 0 && test ! -d "$gentop"; then + exit $status + fi + generated="$generated $gentop" +*************** +*** 3009,3024 **** + + $show "${rm}r $xdir" + $run ${rm}r "$xdir" +! $show "mkdir $xdir" +! $run mkdir "$xdir" + status=$? +! if test $status -ne 0 && test ! -d "$xdir"; then + exit $status + fi + $show "(cd $xdir && $AR x $xabs)" + $run eval "(cd \$xdir && $AR x \$xabs)" || exit $? + +! reload_conv_objs="$reload_objs "`find $xdir -name \*.o -print -o -name \*.lo -print | $NL2SP` + done + fi + fi +--- 3592,3607 ---- + + $show "${rm}r $xdir" + $run ${rm}r "$xdir" +! $show "$mkdir $xdir" +! $run $mkdir "$xdir" + status=$? +! if test "$status" -ne 0 && test ! -d "$xdir"; then + exit $status + fi + $show "(cd $xdir && $AR x $xabs)" + $run eval "(cd \$xdir && $AR x \$xabs)" || exit $? + +! reload_conv_objs="$reload_objs "`find $xdir -name \*.$objext -print -o -name \*.lo -print | $NL2SP` + done + fi + fi +*************** +*** 3054,3061 **** + + # Create an invalid libtool object if no PIC, so that we don't + # accidentally link it into a program. +! $show "echo timestamp > $libobj" +! $run eval "echo timestamp > $libobj" || exit $? + exit 0 + fi + +--- 3637,3644 ---- + + # Create an invalid libtool object if no PIC, so that we don't + # accidentally link it into a program. +! # $show "echo timestamp > $libobj" +! # $run eval "echo timestamp > $libobj" || exit $? + exit 0 + fi + +*************** +*** 3071,3090 **** + $run eval "$cmd" || exit $? + done + IFS="$save_ifs" +- else +- # Just create a symlink. +- $show $rm $libobj +- $run $rm $libobj +- xdir=`$echo "X$libobj" | $Xsed -e 's%/[^/]*$%%'` +- if test "X$xdir" = "X$libobj"; then +- xdir="." +- else +- xdir="$xdir" +- fi +- baseobj=`$echo "X$libobj" | $Xsed -e 's%^.*/%%'` +- oldobj=`$echo "X$baseobj" | $Xsed -e "$lo2o"` +- $show "(cd $xdir && $LN_S $oldobj $baseobj)" +- $run eval '(cd $xdir && $LN_S $oldobj $baseobj)' || exit $? + fi + + if test -n "$gentop"; then +--- 3654,3659 ---- +*************** +*** 3097,3103 **** + + prog) + case $host in +! *cygwin*) output=`echo $output | sed -e 's,.exe$,,;s,$,.exe,'` ;; + esac + if test -n "$vinfo"; then + $echo "$modename: warning: \`-version-info' is ignored for programs" 1>&2 +--- 3666,3672 ---- + + prog) + case $host in +! *cygwin*) output=`echo $output | ${SED} -e 's,.exe$,,;s,$,.exe,'` ;; + esac + if test -n "$vinfo"; then + $echo "$modename: warning: \`-version-info' is ignored for programs" 1>&2 +*************** +*** 3285,3293 **** + if test -z "$export_symbols"; then + export_symbols="$output_objdir/$output.exp" + $run $rm $export_symbols +! $run eval "sed -n -e '/^: @PROGRAM@$/d' -e 's/^.* \(.*\)$/\1/p' "'< "$nlist" > "$export_symbols"' + else +! $run eval "sed -e 's/\([][.*^$]\)/\\\1/g' -e 's/^/ /' -e 's/$/$/'"' < "$export_symbols" > "$output_objdir/$output.exp"' + $run eval 'grep -f "$output_objdir/$output.exp" < "$nlist" > "$nlist"T' + $run eval 'mv "$nlist"T "$nlist"' + fi +--- 3854,3862 ---- + if test -z "$export_symbols"; then + export_symbols="$output_objdir/$output.exp" + $run $rm $export_symbols +! $run eval "${SED} -n -e '/^: @PROGRAM@$/d' -e 's/^.* \(.*\)$/\1/p' "'< "$nlist" > "$export_symbols"' + else +! $run eval "${SED} -e 's/\([][.*^$]\)/\\\1/g' -e 's/^/ /' -e 's/$/$/'"' < "$export_symbols" > "$output_objdir/$output.exp"' + $run eval 'grep -f "$output_objdir/$output.exp" < "$nlist" > "$nlist"T' + $run eval 'mv "$nlist"T "$nlist"' + fi +*************** +*** 3295,3301 **** + + for arg in $dlprefiles; do + $show "extracting global C symbols from \`$arg'" +! name=`echo "$arg" | sed -e 's%^.*/%%'` + $run eval 'echo ": $name " >> "$nlist"' + $run eval "$NM $arg | $global_symbol_pipe >> '$nlist'" + done +--- 3864,3870 ---- + + for arg in $dlprefiles; do + $show "extracting global C symbols from \`$arg'" +! name=`echo "$arg" | ${SED} -e 's%^.*/%%'` + $run eval 'echo ": $name " >> "$nlist"' + $run eval "$NM $arg | $global_symbol_pipe >> '$nlist'" + done +*************** +*** 3310,3316 **** + fi + + # Try sorting and uniquifying the output. +! if grep -v "^: " < "$nlist" | sort +2 | uniq > "$nlist"S; then + : + else + grep -v "^: " < "$nlist" > "$nlist"S +--- 3879,3891 ---- + fi + + # Try sorting and uniquifying the output. +! if grep -v "^: " < "$nlist" | +! if sort -k 3 </dev/null >/dev/null 2>&1; then +! sort -k 3 +! else +! sort +2 +! fi | +! uniq > "$nlist"S; then + : + else + grep -v "^: " < "$nlist" > "$nlist"S +*************** +*** 3371,3388 **** + *-*-freebsd2*|*-*-freebsd3.0*|*-*-freebsdelf3.0*) + case "$compile_command " in + *" -static "*) ;; +! *) pic_flag_for_symtable=" $pic_flag -DPIC -DFREEBSD_WORKAROUND";; + esac;; + *-*-hpux*) + case "$compile_command " in + *" -static "*) ;; +! *) pic_flag_for_symtable=" $pic_flag -DPIC";; + esac + esac + + # Now compile the dynamic symbol file. +! $show "(cd $output_objdir && $CC -c$no_builtin_flag$pic_flag_for_symtable \"$dlsyms\")" +! $run eval '(cd $output_objdir && $CC -c$no_builtin_flag$pic_flag_for_symtable "$dlsyms")' || exit $? + + # Clean up the generated files. + $show "$rm $output_objdir/$dlsyms $nlist ${nlist}S ${nlist}T" +--- 3946,3963 ---- + *-*-freebsd2*|*-*-freebsd3.0*|*-*-freebsdelf3.0*) + case "$compile_command " in + *" -static "*) ;; +! *) pic_flag_for_symtable=" $pic_flag -DFREEBSD_WORKAROUND";; + esac;; + *-*-hpux*) + case "$compile_command " in + *" -static "*) ;; +! *) pic_flag_for_symtable=" $pic_flag";; + esac + esac + + # Now compile the dynamic symbol file. +! $show "(cd $output_objdir && $LTCC -c$no_builtin_flag$pic_flag_for_symtable \"$dlsyms\")" +! $run eval '(cd $output_objdir && $LTCC -c$no_builtin_flag$pic_flag_for_symtable "$dlsyms")' || exit $? + + # Clean up the generated files. + $show "$rm $output_objdir/$dlsyms $nlist ${nlist}S ${nlist}T" +*************** +*** 3407,3413 **** + finalize_command=`$echo "X$finalize_command" | $Xsed -e "s% @SYMFILE@%%"` + fi + +! if test $need_relink = no || test "$build_libtool_libs" != yes; then + # Replace the output file specification. + compile_command=`$echo "X$compile_command" | $Xsed -e 's%@OUTPUT@%'"$output"'%g'` + link_command="$compile_command$compile_rpath" +--- 3982,3988 ---- + finalize_command=`$echo "X$finalize_command" | $Xsed -e "s% @SYMFILE@%%"` + fi + +! if test "$need_relink" = no || test "$build_libtool_libs" != yes; then + # Replace the output file specification. + compile_command=`$echo "X$compile_command" | $Xsed -e 's%@OUTPUT@%'"$output"'%g'` + link_command="$compile_command$compile_rpath" +*************** +*** 3532,3538 **** + relink_command="$var=\"$var_value\"; export $var; $relink_command" + fi + done +! relink_command="cd `pwd`; $relink_command" + relink_command=`$echo "X$relink_command" | $Xsed -e "$sed_quote_subst"` + fi + +--- 4107,4113 ---- + relink_command="$var=\"$var_value\"; export $var; $relink_command" + fi + done +! relink_command="(cd `pwd`; $relink_command)" + relink_command=`$echo "X$relink_command" | $Xsed -e "$sed_quote_subst"` + fi + +*************** +*** 3552,3562 **** + # win32 will think the script is a binary if it has + # a .exe suffix, so we strip it off here. + case $output in +! *.exe) output=`echo $output|sed 's,.exe$,,'` ;; + esac + # test for cygwin because mv fails w/o .exe extensions + case $host in +! *cygwin*) exeext=.exe ;; + *) exeext= ;; + esac + $rm $output +--- 4127,4139 ---- + # win32 will think the script is a binary if it has + # a .exe suffix, so we strip it off here. + case $output in +! *.exe) output=`echo $output|${SED} 's,.exe$,,'` ;; + esac + # test for cygwin because mv fails w/o .exe extensions + case $host in +! *cygwin*) +! exeext=.exe +! outputname=`echo $outputname|${SED} 's,.exe$,,'` ;; + *) exeext= ;; + esac + $rm $output +*************** +*** 3576,3582 **** + + # Sed substitution that helps us do robust quoting. It backslashifies + # metacharacters that are still active within double-quoted strings. +! Xsed='sed -e 1s/^X//' + sed_quote_subst='$sed_quote_subst' + + # The HP-UX ksh and POSIX shell print the target directory to stdout +--- 4153,4159 ---- + + # Sed substitution that helps us do robust quoting. It backslashifies + # metacharacters that are still active within double-quoted strings. +! Xsed='${SED} -e 1s/^X//' + sed_quote_subst='$sed_quote_subst' + + # The HP-UX ksh and POSIX shell print the target directory to stdout +*************** +*** 3614,3620 **** + test \"x\$thisdir\" = \"x\$file\" && thisdir=. + + # Follow symbolic links until we get to the real thisdir. +! file=\`ls -ld \"\$file\" | sed -n 's/.*-> //p'\` + while test -n \"\$file\"; do + destdir=\`\$echo \"X\$file\" | \$Xsed -e 's%/[^/]*\$%%'\` + +--- 4191,4197 ---- + test \"x\$thisdir\" = \"x\$file\" && thisdir=. + + # Follow symbolic links until we get to the real thisdir. +! file=\`ls -ld \"\$file\" | ${SED} -n 's/.*-> //p'\` + while test -n \"\$file\"; do + destdir=\`\$echo \"X\$file\" | \$Xsed -e 's%/[^/]*\$%%'\` + +*************** +*** 3627,3633 **** + fi + + file=\`\$echo \"X\$file\" | \$Xsed -e 's%^.*/%%'\` +! file=\`ls -ld \"\$thisdir/\$file\" | sed -n 's/.*-> //p'\` + done + + # Try to get the absolute directory name. +--- 4204,4210 ---- + fi + + file=\`\$echo \"X\$file\" | \$Xsed -e 's%^.*/%%'\` +! file=\`ls -ld \"\$thisdir/\$file\" | ${SED} -n 's/.*-> //p'\` + done + + # Try to get the absolute directory name. +*************** +*** 3641,3647 **** + progdir=\"\$thisdir/$objdir\" + + if test ! -f \"\$progdir/\$program\" || \\ +! { file=\`ls -1dt \"\$progdir/\$program\" \"\$progdir/../\$program\" 2>/dev/null | sed 1q\`; \\ + test \"X\$file\" != \"X\$progdir/\$program\"; }; then + + file=\"\$\$-\$program\" +--- 4218,4224 ---- + progdir=\"\$thisdir/$objdir\" + + if test ! -f \"\$progdir/\$program\" || \\ +! { file=\`ls -1dt \"\$progdir/\$program\" \"\$progdir/../\$program\" 2>/dev/null | ${SED} 1q\`; \\ + test \"X\$file\" != \"X\$progdir/\$program\"; }; then + + file=\"\$\$-\$program\" +*************** +*** 3763,3769 **** + oldobjs="$libobjs_save" + build_libtool_libs=no + else +! oldobjs="$objs$old_deplibs "`$echo "X$libobjs_save" | $SP2NL | $Xsed -e '/\.'${libext}'$/d' -e '/\.lib$/d' -e "$lo2o" | $NL2SP` + fi + addlibs="$old_convenience" + fi +--- 4340,4346 ---- + oldobjs="$libobjs_save" + build_libtool_libs=no + else +! oldobjs="$oldobjs$old_deplibs $non_pic_objects" + fi + addlibs="$old_convenience" + fi +*************** +*** 3772,3781 **** + gentop="$output_objdir/${outputname}x" + $show "${rm}r $gentop" + $run ${rm}r "$gentop" +! $show "mkdir $gentop" +! $run mkdir "$gentop" + status=$? +! if test $status -ne 0 && test ! -d "$gentop"; then + exit $status + fi + generated="$generated $gentop" +--- 4349,4358 ---- + gentop="$output_objdir/${outputname}x" + $show "${rm}r $gentop" + $run ${rm}r "$gentop" +! $show "$mkdir $gentop" +! $run $mkdir "$gentop" + status=$? +! if test "$status" -ne 0 && test ! -d "$gentop"; then + exit $status + fi + generated="$generated $gentop" +*************** +*** 3792,3801 **** + + $show "${rm}r $xdir" + $run ${rm}r "$xdir" +! $show "mkdir $xdir" +! $run mkdir "$xdir" + status=$? +! if test $status -ne 0 && test ! -d "$xdir"; then + exit $status + fi + $show "(cd $xdir && $AR x $xabs)" +--- 4369,4378 ---- + + $show "${rm}r $xdir" + $run ${rm}r "$xdir" +! $show "$mkdir $xdir" +! $run $mkdir "$xdir" + status=$? +! if test "$status" -ne 0 && test ! -d "$xdir"; then + exit $status + fi + $show "(cd $xdir && $AR x $xabs)" +*************** +*** 3809,3833 **** + if test -n "$old_archive_from_new_cmds" && test "$build_libtool_libs" = yes; then + eval cmds=\"$old_archive_from_new_cmds\" + else +! # Ensure that we have .o objects in place in case we decided +! # not to build a shared library, and have fallen back to building +! # static libs even though --disable-static was passed! +! for oldobj in $oldobjs; do +! if test ! -f $oldobj; then +! xdir=`$echo "X$oldobj" | $Xsed -e 's%/[^/]*$%%'` +! if test "X$xdir" = "X$oldobj"; then +! xdir="." +! else +! xdir="$xdir" +! fi +! baseobj=`$echo "X$oldobj" | $Xsed -e 's%^.*/%%'` +! obj=`$echo "X$baseobj" | $Xsed -e "$o2lo"` +! $show "(cd $xdir && ${LN_S} $obj $baseobj)" +! $run eval '(cd $xdir && ${LN_S} $obj $baseobj)' || exit $? + fi + done +! +! eval cmds=\"$old_archive_cmds\" + fi + save_ifs="$IFS"; IFS='~' + for cmd in $cmds; do +--- 4386,4438 ---- + if test -n "$old_archive_from_new_cmds" && test "$build_libtool_libs" = yes; then + eval cmds=\"$old_archive_from_new_cmds\" + else +! eval cmds=\"$old_archive_cmds\" +! +! if len=`expr "X$cmds" : ".*"` && +! test "$len" -le "$max_cmd_len" || test "$max_cmd_len" -le -1; then +! : +! else +! # the command line is too long to link in one step, link in parts +! $echo "using piecewise archive linking..." +! save_RANLIB=$RANLIB +! RANLIB=: +! objlist= +! concat_cmds= +! save_oldobjs=$oldobjs +! # GNU ar 2.10+ was changed to match POSIX; thus no paths are +! # encoded into archives. This makes 'ar r' malfunction in +! # this piecewise linking case whenever conflicting object +! # names appear in distinct ar calls; check, warn and compensate. +! if (for obj in $save_oldobjs +! do +! $echo "X$obj" | $Xsed -e 's%^.*/%%' +! done | sort | sort -uc >/dev/null 2>&1); then +! : +! else +! $echo "$modename: warning: object name conflicts; overriding AR_FLAGS to 'cq'" 1>&2 +! $echo "$modename: warning: to ensure that POSIX-compatible ar will work" 1>&2 +! AR_FLAGS=cq +! fi +! for obj in $save_oldobjs +! do +! oldobjs="$objlist $obj" +! objlist="$objlist $obj" +! eval test_cmds=\"$old_archive_cmds\" +! if len=`expr "X$test_cmds" : ".*"` && +! test "$len" -le "$max_cmd_len"; then +! : +! else +! # the above command should be used before it gets too long +! oldobjs=$objlist +! test -z "$concat_cmds" || concat_cmds=$concat_cmds~ +! eval concat_cmds=\"\${concat_cmds}$old_archive_cmds\" +! objlist= + fi + done +! RANLIB=$save_RANLIB +! oldobjs=$objlist +! eval cmds=\"\$concat_cmds~$old_archive_cmds\" +! fi + fi + save_ifs="$IFS"; IFS='~' + for cmd in $cmds; do +*************** +*** 3862,3868 **** + fi + done + # Quote the link command for shipping. +! relink_command="cd `pwd`; $SHELL $0 --mode=relink $libtool_args" + relink_command=`$echo "X$relink_command" | $Xsed -e "$sed_quote_subst"` + + # Only create the output if not a dry run. +--- 4467,4473 ---- + fi + done + # Quote the link command for shipping. +! relink_command="(cd `pwd`; $SHELL $0 --mode=relink $libtool_args)" + relink_command=`$echo "X$relink_command" | $Xsed -e "$sed_quote_subst"` + + # Only create the output if not a dry run. +*************** +*** 3879,3885 **** + case $deplib in + *.la) + name=`$echo "X$deplib" | $Xsed -e 's%^.*/%%'` +! eval libdir=`sed -n -e 's/^libdir=\(.*\)$/\1/p' $deplib` + if test -z "$libdir"; then + $echo "$modename: \`$deplib' is not a valid libtool archive" 1>&2 + exit 1 +--- 4484,4490 ---- + case $deplib in + *.la) + name=`$echo "X$deplib" | $Xsed -e 's%^.*/%%'` +! eval libdir=`${SED} -n -e 's/^libdir=\(.*\)$/\1/p' $deplib` + if test -z "$libdir"; then + $echo "$modename: \`$deplib' is not a valid libtool archive" 1>&2 + exit 1 +*************** +*** 3893,3899 **** + newdlfiles= + for lib in $dlfiles; do + name=`$echo "X$lib" | $Xsed -e 's%^.*/%%'` +! eval libdir=`sed -n -e 's/^libdir=\(.*\)$/\1/p' $lib` + if test -z "$libdir"; then + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + exit 1 +--- 4498,4504 ---- + newdlfiles= + for lib in $dlfiles; do + name=`$echo "X$lib" | $Xsed -e 's%^.*/%%'` +! eval libdir=`${SED} -n -e 's/^libdir=\(.*\)$/\1/p' $lib` + if test -z "$libdir"; then + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + exit 1 +*************** +*** 3904,3910 **** + newdlprefiles= + for lib in $dlprefiles; do + name=`$echo "X$lib" | $Xsed -e 's%^.*/%%'` +! eval libdir=`sed -n -e 's/^libdir=\(.*\)$/\1/p' $lib` + if test -z "$libdir"; then + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + exit 1 +--- 4509,4515 ---- + newdlprefiles= + for lib in $dlprefiles; do + name=`$echo "X$lib" | $Xsed -e 's%^.*/%%'` +! eval libdir=`${SED} -n -e 's/^libdir=\(.*\)$/\1/p' $lib` + if test -z "$libdir"; then + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + exit 1 +*************** +*** 3952,3958 **** + + # Directory that this library needs to be installed in: + libdir='$install_libdir'" +! if test "$installed" = no && test $need_relink = yes; then + $echo >> $output "\ + relink_command=\"$relink_command\"" + fi +--- 4557,4563 ---- + + # Directory that this library needs to be installed in: + libdir='$install_libdir'" +! if test "$installed" = no && test "$need_relink" = yes; then + $echo >> $output "\ + relink_command=\"$relink_command\"" + fi +*************** +*** 4088,4094 **** + + # Not a directory, so check to see that there is only one file specified. + set dummy $files +! if test $# -gt 2; then + $echo "$modename: \`$dest' is not a directory" 1>&2 + $echo "$help" 1>&2 + exit 1 +--- 4693,4699 ---- + + # Not a directory, so check to see that there is only one file specified. + set dummy $files +! if test "$#" -gt 2; then + $echo "$modename: \`$dest' is not a directory" 1>&2 + $echo "$help" 1>&2 + exit 1 +*************** +*** 4128,4134 **** + + *.la) + # Check to see that this really is a libtool archive. +! if (sed -e '2q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then : + else + $echo "$modename: \`$file' is not a valid libtool archive" 1>&2 + $echo "$help" 1>&2 +--- 4733,4739 ---- + + *.la) + # Check to see that this really is a libtool archive. +! if (${SED} -e '2q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then : + else + $echo "$modename: \`$file' is not a valid libtool archive" 1>&2 + $echo "$help" 1>&2 +*************** +*** 4145,4165 **** + esac + + # Add the libdir to current_libdirs if it is the destination. +- DESTDIR= + if test "X$destdir" = "X$libdir"; then + case "$current_libdirs " in + *" $libdir "*) ;; + *) current_libdirs="$current_libdirs $libdir" ;; + esac + else +- case "$destdir" in +- *"$libdir") +- DESTDIR=`$echo "$destdir" | sed -e 's!'"$libdir"'$!!'` +- if test "X$destdir" != "X$DESTDIR$libdir"; then +- DESTDIR= +- fi +- ;; +- esac + # Note the libdir as a future libdir. + case "$future_libdirs " in + *" $libdir "*) ;; +--- 4750,4761 ---- +*************** +*** 4173,4179 **** + + if test -n "$relink_command"; then + $echo "$modename: warning: relinking \`$file'" 1>&2 +- export DESTDIR + $show "$relink_command" + if $run eval "$relink_command"; then : + else +--- 4769,4774 ---- +*************** +*** 4181,4187 **** + continue + fi + fi +- unset DESTDIR + + # See the names of the shared library. + set dummy $library_names +--- 4776,4781 ---- +*************** +*** 4201,4207 **** + $run eval "$striplib $destdir/$realname" || exit $? + fi + +! if test $# -gt 0; then + # Delete the old symlinks, and create new ones. + for linkname + do +--- 4795,4801 ---- + $run eval "$striplib $destdir/$realname" || exit $? + fi + +! if test "$#" -gt 0; then + # Delete the old symlinks, and create new ones. + for linkname + do +*************** +*** 4287,4306 **** + destfile="$destdir/$destfile" + fi + + # Do a test to see if this is really a libtool program. +! if (sed -e '4q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then + notinst_deplibs= + relink_command= + + # If there is no directory component, then add one. + case $file in +! */* | *\\*) . $file ;; +! *) . ./$file ;; + esac + + # Check the variables that should have been set. + if test -z "$notinst_deplibs"; then +! $echo "$modename: invalid libtool wrapper script \`$file'" 1>&2 + exit 1 + fi + +--- 4881,4921 ---- + destfile="$destdir/$destfile" + fi + ++ # If the file is missing, and there is a .exe on the end, strip it ++ # because it is most likely a libtool script we actually want to ++ # install ++ stripped_ext="" ++ case $file in ++ *.exe) ++ if test ! -f "$file"; then ++ file=`echo $file|${SED} 's,.exe$,,'` ++ stripped_ext=".exe" ++ fi ++ ;; ++ esac ++ + # Do a test to see if this is really a libtool program. +! case $host in +! *cygwin*|*mingw*) +! wrapper=`echo $file | ${SED} -e 's,.exe$,,'` +! ;; +! *) +! wrapper=$file +! ;; +! esac +! if (${SED} -e '4q' $wrapper | egrep "^# Generated by .*$PACKAGE")>/dev/null 2>&1; then + notinst_deplibs= + relink_command= + + # If there is no directory component, then add one. + case $file in +! */* | *\\*) . $wrapper ;; +! *) . ./$wrapper ;; + esac + + # Check the variables that should have been set. + if test -z "$notinst_deplibs"; then +! $echo "$modename: invalid libtool wrapper script \`$wrapper'" 1>&2 + exit 1 + fi + +*************** +*** 4340,4346 **** + $echo "$modename: error: cannot create temporary directory \`$tmpdir'" 1>&2 + continue + fi +! file=`$echo "X$file" | $Xsed -e 's%^.*/%%'` + outputname="$tmpdir/$file" + # Replace the output file specification. + relink_command=`$echo "X$relink_command" | $Xsed -e 's%@OUTPUT@%'"$outputname"'%g'` +--- 4955,4961 ---- + $echo "$modename: error: cannot create temporary directory \`$tmpdir'" 1>&2 + continue + fi +! file=`$echo "X$file$stripped_ext" | $Xsed -e 's%^.*/%%'` + outputname="$tmpdir/$file" + # Replace the output file specification. + relink_command=`$echo "X$relink_command" | $Xsed -e 's%@OUTPUT@%'"$outputname"'%g'` +*************** +*** 4358,4371 **** + fi + else + # Install the binary that we compiled earlier. +! file=`$echo "X$file" | $Xsed -e "s%\([^/]*\)$%$objdir/\1%"` + fi + fi + + # remove .exe since cygwin /usr/bin/install will append another + # one anyways + case $install_prog,$host in +! /usr/bin/install*,*cygwin*) + case $file:$destfile in + *.exe:*.exe) + # this is ok +--- 4973,4986 ---- + fi + else + # Install the binary that we compiled earlier. +! file=`$echo "X$file$stripped_ext" | $Xsed -e "s%\([^/]*\)$%$objdir/\1%"` + fi + fi + + # remove .exe since cygwin /usr/bin/install will append another + # one anyways + case $install_prog,$host in +! */usr/bin/install*,*cygwin*) + case $file:$destfile in + *.exe:*.exe) + # this is ok +*************** +*** 4374,4380 **** + destfile=$destfile.exe + ;; + *:*.exe) +! destfile=`echo $destfile | sed -e 's,.exe$,,'` + ;; + esac + ;; +--- 4989,4995 ---- + destfile=$destfile.exe + ;; + *:*.exe) +! destfile=`echo $destfile | ${SED} -e 's,.exe$,,'` + ;; + esac + ;; +*************** +*** 4459,4465 **** + fi + + # Exit here if they wanted silent mode. +! test "$show" = ":" && exit 0 + + echo "----------------------------------------------------------------------" + echo "Libraries have been installed in:" +--- 5074,5080 ---- + fi + + # Exit here if they wanted silent mode. +! test "$show" = : && exit 0 + + echo "----------------------------------------------------------------------" + echo "Libraries have been installed in:" +*************** +*** 4522,4528 **** + case $file in + *.la) + # Check to see that this really is a libtool archive. +! if (sed -e '2q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then : + else + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + $echo "$help" 1>&2 +--- 5137,5143 ---- + case $file in + *.la) + # Check to see that this really is a libtool archive. +! if (${SED} -e '2q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then : + else + $echo "$modename: \`$lib' is not a valid libtool archive" 1>&2 + $echo "$help" 1>&2 +*************** +*** 4593,4599 **** + -*) ;; + *) + # Do a test to see if this is really a libtool program. +! if (sed -e '4q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then + # If there is no directory component, then add one. + case $file in + */* | *\\*) . $file ;; +--- 5208,5214 ---- + -*) ;; + *) + # Do a test to see if this is really a libtool program. +! if (${SED} -e '4q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then + # If there is no directory component, then add one. + case $file in + */* | *\\*) . $file ;; +*************** +*** 4625,4631 **** + fi + + # Now prepare to actually exec the command. +! exec_cmd='"$cmd"$args' + else + # Display what would be done. + if test -n "$shlibpath_var"; then +--- 5240,5246 ---- + fi + + # Now prepare to actually exec the command. +! exec_cmd="\$cmd$args" + else + # Display what would be done. + if test -n "$shlibpath_var"; then +*************** +*** 4675,4684 **** + objdir="$dir/$objdir" + fi + name=`$echo "X$file" | $Xsed -e 's%^.*/%%'` +! test $mode = uninstall && objdir="$dir" + + # Remember objdir for removal later, being careful to avoid duplicates +! if test $mode = clean; then + case " $rmdirs " in + *" $objdir "*) ;; + *) rmdirs="$rmdirs $objdir" ;; +--- 5290,5299 ---- + objdir="$dir/$objdir" + fi + name=`$echo "X$file" | $Xsed -e 's%^.*/%%'` +! test "$mode" = uninstall && objdir="$dir" + + # Remember objdir for removal later, being careful to avoid duplicates +! if test "$mode" = clean; then + case " $rmdirs " in + *" $objdir "*) ;; + *) rmdirs="$rmdirs $objdir" ;; +*************** +*** 4702,4708 **** + case $name in + *.la) + # Possibly a libtool archive, so verify it. +! if (sed -e '2q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then + . $dir/$name + + # Delete the libtool libraries and symlinks. +--- 5317,5323 ---- + case $name in + *.la) + # Possibly a libtool archive, so verify it. +! if (${SED} -e '2q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then + . $dir/$name + + # Delete the libtool libraries and symlinks. +*************** +*** 4710,4718 **** + rmfiles="$rmfiles $objdir/$n" + done + test -n "$old_library" && rmfiles="$rmfiles $objdir/$old_library" +! test $mode = clean && rmfiles="$rmfiles $objdir/$name $objdir/${name}i" + +! if test $mode = uninstall; then + if test -n "$library_names"; then + # Do each command in the postuninstall commands. + eval cmds=\"$postuninstall_cmds\" +--- 5325,5333 ---- + rmfiles="$rmfiles $objdir/$n" + done + test -n "$old_library" && rmfiles="$rmfiles $objdir/$old_library" +! test "$mode" = clean && rmfiles="$rmfiles $objdir/$name $objdir/${name}i" + +! if test "$mode" = uninstall; then + if test -n "$library_names"; then + # Do each command in the postuninstall commands. + eval cmds=\"$postuninstall_cmds\" +*************** +*** 4721,4727 **** + IFS="$save_ifs" + $show "$cmd" + $run eval "$cmd" +! if test $? != 0 && test "$rmforce" != yes; then + exit_status=1 + fi + done +--- 5336,5342 ---- + IFS="$save_ifs" + $show "$cmd" + $run eval "$cmd" +! if test "$?" -ne 0 && test "$rmforce" != yes; then + exit_status=1 + fi + done +*************** +*** 4736,4742 **** + IFS="$save_ifs" + $show "$cmd" + $run eval "$cmd" +! if test $? != 0 && test "$rmforce" != yes; then + exit_status=1 + fi + done +--- 5351,5357 ---- + IFS="$save_ifs" + $show "$cmd" + $run eval "$cmd" +! if test "$?" -ne 0 && test "$rmforce" != yes; then + exit_status=1 + fi + done +*************** +*** 4748,4763 **** + ;; + + *.lo) +! if test "$build_old_libs" = yes; then +! oldobj=`$echo "X$name" | $Xsed -e "$lo2o"` +! rmfiles="$rmfiles $dir/$oldobj" + fi + ;; + + *) + # Do a test to see if this is a libtool program. +! if test $mode = clean && +! (sed -e '4q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then + relink_command= + . $dir/$file + +--- 5363,5392 ---- + ;; + + *.lo) +! # Possibly a libtool object, so verify it. +! if (${SED} -e '2q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then +! +! # Read the .lo file +! . $dir/$name +! +! # Add PIC object to the list of files to remove. +! if test -n "$pic_object" \ +! && test "$pic_object" != none; then +! rmfiles="$rmfiles $dir/$pic_object" +! fi +! +! # Add non-PIC object to the list of files to remove. +! if test -n "$non_pic_object" \ +! && test "$non_pic_object" != none; then +! rmfiles="$rmfiles $dir/$non_pic_object" +! fi + fi + ;; + + *) + # Do a test to see if this is a libtool program. +! if test "$mode" = clean && +! (${SED} -e '4q' $file | egrep "^# Generated by .*$PACKAGE") >/dev/null 2>&1; then + relink_command= + . $dir/$file + +*************** +*** 4818,4823 **** +--- 5447,5453 ---- + --mode=MODE use operation mode MODE [default=inferred from MODE-ARGS] + --quiet same as \`--silent' + --silent don't print informational messages ++ --tag=TAG use configuration variables from tag TAG + --version print version information + + MODE must be one of the following: +*************** +*** 4943,4948 **** +--- 5573,5579 ---- + -no-install link a not-installable executable + -no-undefined declare that a library does not refer to external symbols + -o OUTPUT-FILE create OUTPUT-FILE from the specified objects ++ -objectlist FILE Use a list of object files found in FILE to specify objects + -release RELEASE specify package release information + -rpath LIBDIR the created library will eventually be installed in LIBDIR + -R[ ]LIBDIR add LIBDIR to the runtime path of programs and libraries +*************** +*** 4993,4998 **** +--- 5624,5649 ---- + + exit 0 + ++ # The TAGs below are defined such that we never get into a situation ++ # in which we disable both kinds of libraries. Given conflicting ++ # choices, we go for a static library, that is the most portable, ++ # since we can't tell whether shared libraries were disabled because ++ # the user asked for that or because the platform doesn't support ++ # them. This is particularly important on AIX, because we don't ++ # support having both static and shared libraries enabled at the same ++ # time on that platform, so we default to a shared-only configuration. ++ # If a disable-shared tag is given, we'll fallback to a static-only ++ # configuration. But we'll never go from static-only to shared-only. ++ ++ # ### BEGIN LIBTOOL TAG CONFIG: disable-shared ++ build_libtool_libs=no ++ build_old_libs=yes ++ # ### END LIBTOOL TAG CONFIG: disable-shared ++ ++ # ### BEGIN LIBTOOL TAG CONFIG: disable-static ++ build_old_libs=`case $build_libtool_libs in yes) echo no;; *) echo yes;; esac` ++ # ### END LIBTOOL TAG CONFIG: disable-static ++ + # Local Variables: + # mode:shell-script + # sh-indentation:2 diff --git a/netware/overlay.tar.gz b/netware/overlay.tar.gz Binary files differnew file mode 100644 index 00000000000..bff2118b458 --- /dev/null +++ b/netware/overlay.tar.gz diff --git a/netware/test_db.sql b/netware/test_db.sql new file mode 100644 index 00000000000..453d81693ed --- /dev/null +++ b/netware/test_db.sql @@ -0,0 +1,17 @@ +USE mysql; + +CREATE TABLE db (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Select_priv enum('N','Y') DEFAULT 'N' NOT NULL, Insert_priv enum('N','Y') DEFAULT 'N' NOT NULL, Update_priv enum('N','Y') DEFAULT 'N' NOT NULL, Delete_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_priv enum('N','Y') DEFAULT 'N' NOT NULL, Drop_priv enum('N','Y') DEFAULT 'N' NOT NULL, Grant_priv enum('N','Y') DEFAULT 'N' NOT NULL, References_priv enum('N','Y') DEFAULT 'N' NOT NULL, Index_priv enum('N','Y') DEFAULT 'N' NOT NULL, Alter_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_tmp_table_priv enum('N','Y') DEFAULT 'N' NOT NULL, Lock_tables_priv enum('N','Y') DEFAULT 'N' NOT NULL, PRIMARY KEY Host (Host,Db,User), KEY User (User)) comment='Database privileges'; + +CREATE TABLE host (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, Select_priv enum('N','Y') DEFAULT 'N' NOT NULL, Insert_priv enum('N','Y') DEFAULT 'N' NOT NULL, Update_priv enum('N','Y') DEFAULT 'N' NOT NULL, Delete_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_priv enum('N','Y') DEFAULT 'N' NOT NULL, Drop_priv enum('N','Y') DEFAULT 'N' NOT NULL, Grant_priv enum('N','Y') DEFAULT 'N' NOT NULL, References_priv enum('N','Y') DEFAULT 'N' NOT NULL, Index_priv enum('N','Y') DEFAULT 'N' NOT NULL, Alter_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_tmp_table_priv enum('N','Y') DEFAULT 'N' NOT NULL, Lock_tables_priv enum('N','Y') DEFAULT 'N' NOT NULL, PRIMARY KEY Host (Host,Db)) comment='Host privileges; Merged with database privileges'; + +CREATE TABLE user (Host char(60) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Password char(16) binary DEFAULT '' NOT NULL, Select_priv enum('N','Y') DEFAULT 'N' NOT NULL, Insert_priv enum('N','Y') DEFAULT 'N' NOT NULL, Update_priv enum('N','Y') DEFAULT 'N' NOT NULL, Delete_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_priv enum('N','Y') DEFAULT 'N' NOT NULL, Drop_priv enum('N','Y') DEFAULT 'N' NOT NULL, Reload_priv enum('N','Y') DEFAULT 'N' NOT NULL, Shutdown_priv enum('N','Y') DEFAULT 'N' NOT NULL, Process_priv enum('N','Y') DEFAULT 'N' NOT NULL, File_priv enum('N','Y') DEFAULT 'N' NOT NULL, Grant_priv enum('N','Y') DEFAULT 'N' NOT NULL, References_priv enum('N','Y') DEFAULT 'N' NOT NULL, Index_priv enum('N','Y') DEFAULT 'N' NOT NULL, Alter_priv enum('N','Y') DEFAULT 'N' NOT NULL, Show_db_priv enum('N','Y') DEFAULT 'N' NOT NULL, Super_priv enum('N','Y') DEFAULT 'N' NOT NULL, Create_tmp_table_priv enum('N','Y') DEFAULT 'N' NOT NULL, Lock_tables_priv enum('N','Y') DEFAULT 'N' NOT NULL, Execute_priv enum('N','Y') DEFAULT 'N' NOT NULL, Repl_slave_priv enum('N','Y') DEFAULT 'N' NOT NULL, Repl_client_priv enum('N','Y') DEFAULT 'N' NOT NULL, ssl_type enum('','ANY','X509', 'SPECIFIED') DEFAULT '' NOT NULL, ssl_cipher BLOB NOT NULL, x509_issuer BLOB NOT NULL, x509_subject BLOB NOT NULL, max_questions int(11) unsigned DEFAULT 0 NOT NULL, max_updates int(11) unsigned DEFAULT 0 NOT NULL, max_connections int(11) unsigned DEFAULT 0 NOT NULL, PRIMARY KEY Host (Host,User)) comment='Users and global privileges'; + +INSERT INTO user VALUES ('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0); +INSERT INTO user VALUES ('127.0.0.1','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0); +INSERT INTO user VALUES ('localhost','','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0); + +CREATE TABLE func (name char(64) binary DEFAULT '' NOT NULL, ret tinyint(1) DEFAULT '0' NOT NULL, dl char(128) DEFAULT '' NOT NULL, type enum ('function','aggregate') NOT NULL, PRIMARY KEY (name)) comment='User defined functions'; + +CREATE TABLE tables_priv (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Table_name char(60) binary DEFAULT '' NOT NULL, Grantor char(77) DEFAULT '' NOT NULL, Timestamp timestamp(14), Table_priv set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter') DEFAULT '' NOT NULL, Column_priv set('Select','Insert','Update','References') DEFAULT '' NOT NULL, PRIMARY KEY (Host,Db,User,Table_name), KEY Grantor (Grantor)) comment='Table privileges'; + +CREATE TABLE columns_priv (Host char(60) binary DEFAULT '' NOT NULL, Db char(64) binary DEFAULT '' NOT NULL, User char(16) binary DEFAULT '' NOT NULL, Table_name char(64) binary DEFAULT '' NOT NULL, Column_name char(64) binary DEFAULT '' NOT NULL, Timestamp timestamp(14), Column_priv set('Select','Insert','Update','References') DEFAULT '' NOT NULL, PRIMARY KEY (Host,Db,User,Table_name,Column_name)) comment='Column privileges'; diff --git a/scripts/make_binary_distribution.sh b/scripts/make_binary_distribution.sh index c2b1a0cb2b3..0773ccc679c 100644 --- a/scripts/make_binary_distribution.sh +++ b/scripts/make_binary_distribution.sh @@ -46,16 +46,37 @@ if [ -d $BASE ] ; then rm -r -f $BASE fi +BS="" +EXTRA_BIN_FILES="" +BASE_SYSTEM="any" +MYSQL_SHARE=$BASE/share/mysql + +case $system in + *netware*) + BASE_SYSTEM="netware" + BS=".nlm" + MYSQL_SHARE=$BASE/share + EXTRA_BIN_FILES="netware/mysqld_safe.nlm netware/mysql_install_db.nlm \ + netware/init_db.sql netware/test_db.sql netware/mysql_explain_log.nlm \ + netware/mysqlhotcopy.nlm netware/libmysql.nlm" + ;; +esac + + mkdir $BASE $BASE/bin $BASE/data $BASE/data/mysql $BASE/data/test \ - $BASE/include $BASE/lib $BASE/support-files $BASE/share $BASE/share/mysql \ - $BASE/tests $BASE/scripts $BASE/sql-bench $BASE/mysql-test \ - $BASE/mysql-test/t $BASE/mysql-test/r \ - $BASE/mysql-test/include $BASE/mysql-test/std_data $BASE/man $BASE/man/man1 - + $BASE/include $BASE/lib $BASE/support-files $BASE/share $BASE/scripts \ + $BASE/mysql-test $BASE/mysql-test/t $BASE/mysql-test/r \ + $BASE/mysql-test/include $BASE/mysql-test/std_data + +if [ $BASE_SYSTEM != "netware" ] ; then + mkdir $BASE/share/mysql $BASE/tests $BASE/sql-bench $BASE/man $BASE/man/man1 +fi + chmod o-rwx $BASE/data $BASE/data/* for i in ChangeLog COPYING COPYING.LIB README Docs/INSTALL-BINARY \ - MySQLEULA.txt Docs/manual.html Docs/manual.txt Docs/manual_toc.html + MySQLEULA.txt Docs/manual.html Docs/manual.txt Docs/manual_toc.html \ + LICENSE.doc README.NW Docs/mysqlbug.txt do if [ -f $i ] then @@ -63,18 +84,23 @@ do fi done -for i in extra/comp_err extra/replace extra/perror extra/resolveip \ - extra/my_print_defaults extra/resolve_stack_dump \ - isam/isamchk isam/pack_isam myisam/myisamchk \ - myisam/myisampack sql/mysqld client/mysqlbinlog \ - client/mysql sql/mysqld client/mysqlshow client/mysqlcheck \ - client/mysqladmin client/mysqldump client/mysqlimport client/mysqltest \ - client/mysqlmanagerc client/mysqlmanager-pwgen tools/mysqlmanager \ - client/.libs/mysql client/.libs/mysqlshow client/.libs/mysqladmin \ - client/.libs/mysqldump client/.libs/mysqlimport client/.libs/mysqltest \ - client/.libs/mysqlcheck client/.libs/mysqlbinlog \ - client/.libs/mysqlmanagerc client/.libs/mysqlmanager-pwgen \ - tools/.libs/mysqlmanager +for i in extra/comp_err$BS extra/replace$BS extra/perror$BS \ + extra/resolveip$BS extra/my_print_defaults$BS \ + extra/resolve_stack_dump$BS extra/mysql_waitpid$BS \ + isam/isamchk$BS isam/pack_isam$BS \ + myisam/myisamchk$BS myisam/myisampack$BS myisam/myisamlog$BS \ + sql/mysqld$BS \ + client/mysql$BS client/mysqlshow$BS client/mysqladmin$BS \ + client/mysqldump$BS client/mysqlimport$BS \ + client/mysqltest$BS client/mysqlcheck$BS \ + client/mysqlbinlog$BS client/mysqlmanagerc$BS \ + client/mysqlmanager-pwgen$BS tools/mysqlmanager$BS \ + client/.libs/mysql client/.libs/mysqlshow client/.libs/mysqladmin \ + client/.libs/mysqldump client/.libs/mysqlimport \ + client/.libs/mysqltest client/.libs/mysqlcheck \ + client/.libs/mysqlbinlog client/.libs/mysqlmanagerc \ + client/.libs/mysqlmanager-pwgen tools/.libs/mysqlmanager \ + $EXTRA_BIN_FILES do if [ -f $i ] then @@ -86,6 +112,7 @@ if [ x$STRIP = x1 ] ; then strip $BASE/bin/* fi +# Copy not binary files for i in sql/mysqld.sym.gz do if [ -f $i ] @@ -94,7 +121,11 @@ do fi done -for i in libmysql/.libs/libmysqlclient.a libmysql/.libs/libmysqlclient.so* libmysql/libmysqlclient.* libmysql_r/.libs/libmysqlclient_r.a libmysql_r/.libs/libmysqlclient_r.so* libmysql_r/libmysqlclient_r.* mysys/libmysys.a strings/libmystrings.a dbug/libdbug.a libmysqld/.libs/libmysqld.a libmysqld/.libs/libmysqld.so* libmysqld/libmysqld.a +if [ $BASE_SYSTEM = "netware" ] ; then + $CP -r netware/scripts/* $BASE/scripts +fi + +for i in libmysql/.libs/libmysqlclient.a libmysql/.libs/libmysqlclient.so* libmysql/libmysqlclient.* libmysql_r/.libs/libmysqlclient_r.a libmysql_r/.libs/libmysqlclient_r.so* libmysql_r/libmysqlclient_r.* mysys/libmysys.a strings/libmystrings.a dbug/libdbug.a libmysqld/.libs/libmysqld.a libmysqld/.libs/libmysqld.so* libmysqld/libmysqld.a netware/libmysql.imp do if [ -f $i ] then @@ -102,39 +133,72 @@ do fi done +# convert the libs to .lib for NetWare +if [ $BASE_SYSTEM = "netware" ] ; then + for i in $BASE/lib/*.a + do + libname=`basename $i .a` + $MV $i $BASE/lib/$libname.lib + done +fi + $CP config.h include/* $BASE/include -rm $BASE/include/Makefile*; rm $BASE/include/*.in +rm -f $BASE/include/Makefile* $BASE/include/*.in $BASE/include/config-win.h +if [ $BASE_SYSTEM != "netware" ] ; then + rm -f $BASE/include/config-netware.h +fi -$CP tests/*.res tests/*.tst tests/*.pl $BASE/tests +if [ -d tests ] ; then + $CP tests/*.res tests/*.tst tests/*.pl $BASE/tests +fi +if [ -d man ] ; then + $CP man/*.1 $BASE/man/man1 +fi $CP support-files/* $BASE/support-files -$CP man/*.1 $BASE/man/man1 -$CP -r sql/share/* $BASE/share/mysql -rm -f $BASE/share/mysql/Makefile* $BASE/share/mysql/*/*.OLD +if [ $BASE_SYSTEM = "netware" ] ; then + rm -f $BASE/support-files/magic \ + $BASE/support-files/mysql.server \ + $BASE/support-files/mysql*.spec \ + $BASE/support-files/mysql-log-rotate \ + $BASE/support-files/binary-configure +fi + +$CP -r sql/share/* $MYSQL_SHARE +rm -f $MYSQL_SHARE/Makefile* $MYSQL_SHARE/*/*.OLD + +for i in mysql-test/mysql-test-run mysql-test/install_test_db \ + mysql-test/README \ + netware/mysql_test_run.nlm netware/install_test_db.ncf +do + if [ -f $i ] + then + $CP $i $BASE/mysql-test + fi +done -$CP mysql-test/mysql-test-run mysql-test/install_test_db $BASE/mysql-test/ -$CP mysql-test/README $BASE/mysql-test/README $CP mysql-test/include/*.inc $BASE/mysql-test/include $CP mysql-test/std_data/*.dat mysql-test/std_data/*.001 $BASE/mysql-test/std_data -$CP mysql-test/t/*.test mysql-test/t/*.opt mysql-test/t/*.sh $BASE/mysql-test/t -$CP mysql-test/r/*.result mysql-test/r/*.require $BASE/mysql-test/r +$CP mysql-test/t/*test mysql-test/t/*.opt mysql-test/t/*.sh $BASE/mysql-test/t +$CP mysql-test/r/*result mysql-test/r/*.require $BASE/mysql-test/r + +if [ $BASE_SYSTEM != "netware" ] ; then + $CP scripts/* $BASE/bin + $BASE/bin/replace \@localstatedir\@ ./data \@bindir\@ ./bin \@scriptdir\@ ./bin \@libexecdir\@ ./bin \@sbindir\@ ./bin \@prefix\@ . \@HOSTNAME\@ @HOSTNAME@ < $SOURCE/scripts/mysql_install_db.sh > $BASE/scripts/mysql_install_db + $BASE/bin/replace \@prefix\@ /usr/local/mysql \@bindir\@ ./bin \@MYSQLD_USER\@ root \@localstatedir\@ /usr/local/mysql/data \@HOSTNAME\@ @HOSTNAME@ < $SOURCE/support-files/mysql.server.sh > $BASE/support-files/mysql.server + $BASE/bin/replace /my/gnu/bin/hostname /bin/hostname -- $BASE/bin/mysqld_safe + mv $BASE/support-files/binary-configure $BASE/configure + chmod a+x $BASE/bin/* $BASE/scripts/* $BASE/support-files/mysql-* $BASE/support-files/mysql.server $BASE/configure + $CP -r sql-bench/* $BASE/sql-bench + rm -f $BASE/sql-bench/*.sh $BASE/sql-bench/Makefile* $BASE/lib/*.la +fi -$CP scripts/* $BASE/bin rm -f $BASE/bin/Makefile* $BASE/bin/*.in $BASE/bin/*.sh $BASE/bin/mysql_install_db $BASE/bin/make_binary_distribution $BASE/bin/setsomevars $BASE/support-files/Makefile* $BASE/support-files/*.sh -$BASE/bin/replace \@localstatedir\@ ./data \@bindir\@ ./bin \@scriptdir\@ ./bin \@libexecdir\@ ./bin \@sbindir\@ ./bin \@prefix\@ . \@HOSTNAME\@ @HOSTNAME@ < $SOURCE/scripts/mysql_install_db.sh > $BASE/scripts/mysql_install_db -$BASE/bin/replace \@prefix\@ /usr/local/mysql \@bindir\@ ./bin \@MYSQLD_USER\@ root \@localstatedir\@ /usr/local/mysql/data \@HOSTNAME\@ @HOSTNAME@ < $SOURCE/support-files/mysql.server.sh > $BASE/support-files/mysql.server -$BASE/bin/replace /my/gnu/bin/hostname /bin/hostname -- $BASE/bin/mysqld_safe - # Make safe_mysqld a symlink to mysqld_safe for backwards portability # To be removed in MySQL 4.1 (cd $BASE/bin ; ln -s mysqld_safe safe_mysqld ) -mv $BASE/support-files/binary-configure $BASE/configure -chmod a+x $BASE/bin/* $BASE/scripts/* $BASE/support-files/mysql-* $BASE/support-files/mysql.server $BASE/configure -$CP -r sql-bench/* $BASE/sql-bench -rm -f $BASE/sql-bench/*.sh $BASE/sql-bench/Makefile* $BASE/lib/*.la - # Clean up if we did this from a bk tree if [ -d $BASE/sql-bench/SCCS ] ; then find $BASE/share -name SCCS -print | xargs rm -r -f @@ -196,7 +260,7 @@ which_1 () # Create the result tar file # -tar=`which_1 gtar` +tar=`which_1 gnutar gtar` if test "$?" = "1" -o "$tar" = "" then tar=tar diff --git a/scripts/mysqld_safe.sh b/scripts/mysqld_safe.sh index febc7b8e595..0e9f4de09fe 100644 --- a/scripts/mysqld_safe.sh +++ b/scripts/mysqld_safe.sh @@ -47,11 +47,13 @@ parse_arguments() { # mysqld_safe-specific options - must be set in my.cnf ([mysqld_safe])! --ledir=*) ledir=`echo "$arg" | sed -e "s;--ledir=;;"` ;; + # err-log should be removed in 5.0 --err-log=*) err_log=`echo "$arg" | sed -e "s;--err-log=;;"` ;; - # QQ The --open-files should be removed + --log-error=*) err_log=`echo "$arg" | sed -e "s;--log-error=;;"` ;; + # QQ The --open-files should be removed in 5.0 --open-files=*) open_files=`echo "$arg" | sed -e "s;--open-files=;;"` ;; --open-files-limit=*) open_files=`echo "$arg" | sed -e "s;--open-files-limit=;;"` ;; - --core-file-size=*) core_file_size=`echo "$arg" | sed -e "s;--core_file_size=;;"` ;; + --core-file-size=*) core_file_size=`echo "$arg" | sed -e "s;--core-file-size=;;"` ;; --timezone=*) TZ=`echo "$arg" | sed -e "s;--timezone=;;"` ; export TZ; ;; --mysqld=*) MYSQLD=`echo "$arg" | sed -e "s;--mysqld=;;"` ;; --mysqld-version=*) diff --git a/sql-bench/crash-me.sh b/sql-bench/crash-me.sh index 130816de0be..1ae2550d69d 100644 --- a/sql-bench/crash-me.sh +++ b/sql-bench/crash-me.sh @@ -48,7 +48,7 @@ require "$pwd/server-cfg" || die "Can't read Configuration file: $!\n"; $opt_server="mysql"; $opt_host="localhost"; $opt_database="test"; $opt_dir="limits"; -$opt_user=$opt_password="";$opt_verbose=""; +$opt_user=$opt_password="";$opt_verbose=1; $opt_debug=$opt_help=$opt_Information=$opt_restart=$opt_force=$opt_quick=0; $opt_log_all_queries=$opt_fix_limit_file=$opt_batch_mode=$opt_version=0; $opt_db_start_cmd=""; # the db server start command @@ -855,10 +855,6 @@ try_and_report("Automatic row id", "automatic_rowid", ["NOW","now","now()",0,2], # Any value is acceptable ["CURDATE","curdate","curdate()",0,2], ["CURTIME","curtime","curtime()",0,2], - ["HOUR","hour","hour('12:13:14')",12,0], - ["ANSI HOUR","hour_time","hour(TIME '12:13:14')",12,0], - ["MINUTE","minute","minute('12:13:14')",13,0], - ["SECOND","second","second('12:13:14')",14,0], ["TIMESTAMPADD","timestampadd", "timestampadd(SQL_TSI_SECOND,1,'1997-01-01 00:00:00')", "1997-01-01 00:00:01",1], @@ -943,7 +939,6 @@ try_and_report("Automatic row id", "automatic_rowid", ["ROOT","root","root(4)",2,0], # informix ["ROUND(1 arg)","round1","round(5.63)","6",0], ["RPAD","rpad","rpad('hi',4,'??')",'hi??',3], - ["SEC_TO_TIME","sec_to_time","sec_to_time(5001)","01:23:21",1], ["SINH","sinh","sinh(1)","1.17520119",0], # oracle hyperbolic sine of n ["STR","str","str(123.45,5,1)",123.5,3], ["STRCMP","strcmp","strcmp('abc','adc')",-1,0], @@ -957,7 +952,6 @@ try_and_report("Automatic row id", "automatic_rowid", ["TAIL","tail","tail('ABCDEFG',3)","EFG",0], ["TANH","tanh","tanh(1)","0.462117157",0], # oracle hyperbolic tangent of n - ["TIME_TO_SEC","time_to_sec","time_to_sec('01:23:21')","5001",0], ["TRANSLATE","translate","translate('abc','bc','de')",'ade',3], ["TRIM; Many char extension", "trim_many_char","trim(':!' FROM ':abc!')","abc",3], @@ -992,21 +986,10 @@ try_and_report("Automatic row id", "automatic_rowid", ["FLOAT",'float',"float(6666.66,4)",6667,0], ["LENGTH",'length',"length(1)",2,0], ["INDEX",'index',"index('abcdefg','cd',1,1)",3,0], - ["ADDTIME",'addtime',"ADDTIME('00200212','00000300')",'00200215',0], - ["SUBTIME",'subtime',"SUBTIME('00200215','00000300')",'00200212',0], - ["TIMEDIFF",'timediff',"TIMEDIFF('00200215','00200212')",'00000003',0], - ["MAKETIME",'maketime',"MAKETIME(20,02,12)",'00200212',0], - ["HOUR with sapdb internal time as arg", - 'hour_sapdb',"HOUR('00200212')",20,0], - ["MINUTE with sapdb internal time as arg", - 'minute_sapdb',"MINUTE('00200212')",2,0], - ["SECOND with sapdb internal time as arg", - 'second_sapdb',"SECOND('00200212')",12,0], ["MICROSECOND",'microsecond', "MICROSECOND('19630816200212111111')",'111111',0], ["TIMESTAMP",'timestamp', "timestamp('19630816','00200212')",'19630816200212000000',0], - ["TIME",'time',"time('00200212')",'00200212',0], ["VALUE",'value',"value(NULL,'WALRUS')",'WALRUS',0], ["DECODE",'decode',"DECODE('S-103','T72',1,'S-103',2,'Leopard',3)",2,0], ["NUM",'num',"NUM('2123')",2123,0], @@ -1500,6 +1483,137 @@ if ($limits{'type_sql_date'} eq 'yes') } +if ($limits{'type_sql_time'} eq 'yes') +{ # + # Checking the format of date in result. + + safe_query("drop table crash_me_t $drop_attr"); + assert("create table crash_me_t (a time)"); + # find the example of time + my $timeexample; + if ($limits{'func_sql_current_time'} eq 'yes') { + $timeexample='CURRENT_TIME'; + } + elsif ($limits{'func_odbc_curtime'} eq 'yes') { + $timeexample='curtime()'; + } + elsif ($limits{'func_sql_localtime'} eq 'yes') { + $timeexample='localtime'; + } + elsif ($limits{'func_odbc_now'} eq 'yes') { + $timeexample='now()'; + } else { + #try to guess + $timeexample="'02:55:12'"; + } ; + + my $key = 'time_format_inresult'; + my $prompt = "Time format in result"; + if (! safe_query_l('time_format_inresult', + "insert into crash_me_t values($timeexample) ")) + { + die "Cannot insert time ($timeexample):".$last_error; + }; + my $sth= $dbh->prepare("select a from crash_me_t"); + add_log('time_format_inresult',"< select a from crash_me_t"); + $sth->execute; + $_= $sth->fetchrow_array; + add_log('time_format_inresult',"> $_"); + safe_query_l($key,"delete from crash_me_t"); + if (/\d{2}:\d{2}:\d{2}/){ save_config_data($key,"iso",$prompt);} + elsif (/\d{2}\.\d{2}\.\d{2}/){ save_config_data($key,"euro",$prompt);} + elsif (/\d{2}:\d{2}\s+(AM|PM)/i){ save_config_data($key,"usa",$prompt);} + elsif (/\d{8}$/){ save_config_data($key,"HHHHMMSS",$prompt);} + elsif (/\d{4}$/){ save_config_data($key,"HHMMSS",$prompt);} + else { save_config_data($key,"unknown",$prompt);}; + $sth->finish; + + check_and_report("Supports HH:MM:SS (ISO) time format","time_format_ISO", + [ "insert into crash_me_t(a) values ('20:08:16')"], + "select a from crash_me_t", + ["delete from crash_me_t"], + make_time_r(20,8,16),1); + + check_and_report("Supports HH.MM.SS (EUR) time format","time_format_EUR", + [ "insert into crash_me_t(a) values ('20.08.16')"], + "select a from crash_me_t", + ["delete from crash_me_t"], + make_time_r(20,8,16),1); + + check_and_report("Supports HHHHmmSS time format", + "time_format_HHHHMMSS", + [ "insert into crash_me_t(a) values ('00200816')"], + "select a from crash_me_t", + ["delete from crash_me_t"], + make_time_r(20,8,16),1); + + check_and_report("Supports HHmmSS time format", + "time_format_HHHHMMSS", + [ "insert into crash_me_t(a) values ('200816')"], + "select a from crash_me_t", + ["delete from crash_me_t"], + make_time_r(20,8,16),1); + + check_and_report("Supports HH:MM:SS (AM|PM) time format", + "time_format_USA", + [ "insert into crash_me_t(a) values ('08:08:16 PM')"], + "select a from crash_me_t", + ["delete from crash_me_t"], + make_time_r(20,8,16),1); + + my $insert_query ='insert into crash_me_t values('. + make_time(20,8,16).')'; + safe_query($insert_query); + + foreach $fn ( ( + ["HOUR","hour","hour('".make_time(12,13,14)."')",12,0], + ["ANSI HOUR","hour_time","hour(TIME '".make_time(12,13,14)."')",12,0], + ["MINUTE","minute","minute('".make_time(12,13,14)."')",13,0], + ["SECOND","second","second('".make_time(12,13,14)."')",14,0] + + )) + { + $prompt='Function '.$fn->[0]; + $key='func_odbc_'.$fn->[1]; + add_log($key,"< ".$insert_query); + check_and_report($prompt,$key, + [],"select ".$fn->[2]." $end_query",[], + $fn->[3],$fn->[4] + ); + + }; +# safe_query(['delete from crash_me_t', +# 'insert into crash_me_t values('.make_time(20,8,16).')']); + foreach $fn (( + ["TIME_TO_SEC","time_to_sec","time_to_sec('". + make_time(1,23,21)."')","5001",0], + ["SEC_TO_TIME","sec_to_time","sec_to_time(5001)", + make_time_r(01,23,21),1], + ["ADDTIME",'addtime',"ADDTIME('".make_time(20,2,12). + "','".make_time(0,0,3)."')",make_time_r(20,2,15),0], + ["SUBTIME",'subtime',"SUBTIME('".make_time(20,2,15) + ."','".make_time(0,0,3)."')",make_time_r(20,2,12),0], + ["TIMEDIFF",'timediff',"TIMEDIFF('".make_time(20,2,15)."','". + make_time(20,2,12)."')",make_time_r(0,0,3),0], + ["MAKETIME",'maketime',"MAKETIME(20,02,12)",make_time_r(20,2,12),0], + ["TIME",'time',"time('".make_time(20,2,12)."')",make_time_r(20,2,12),0] + )) + { + $prompt='Function '.$fn->[0]; + $key='func_extra_'.$fn->[1]; + my $qry="select ".$fn->[2]." $end_query"; + my $result=$fn->[3]; + check_and_report($prompt,$key, + [],$qry,[], + $result,$fn->[4] + ); + + } + + safe_query("drop table crash_me_t $drop_attr"); + +} + # NOT id BETWEEN a and b if ($limits{'func_where_not_between'} eq 'yes') @@ -2672,6 +2786,39 @@ sub check_constraint { print "$res\n"; } +sub make_time_r { + my $hour=shift; + my $minute=shift; + my $second=shift; + $_ = $limits{'time_format_inresult'}; + return sprintf "%02d:%02d:%02d", ($hour%24),$minute,$second if (/^iso$/); + return sprintf "%02d.%02d.%02d", ($hour%24),$minute,$second if (/^euro/); + return sprintf "%02d:%02d %s", + ($hour >= 13? ($hour-12) : $hour),$minute,($hour >=13 ? 'PM':'AM') + if (/^usa/); + return sprintf "%02d%02d%02d", ($hour%24),$minute,$second if (/^HHMMSS/); + return sprintf "%04d%02d%02d", ($hour%24),$minute,$second if (/^HHHHMMSS/); + return "UNKNOWN FORMAT"; +} + +sub make_time { + my $hour=shift; + my $minute=shift; + my $second=shift; + return sprintf "%02d:%02d:%02d", ($hour%24),$minute,$second + if ($limits{'time_format_ISO'} eq "yes"); + return sprintf "%02d.%02d.%02d", ($hour%24),$minute,$second + if ($limits{'time_format_EUR'} eq "yes"); + return sprintf "%02d:%02d %s", + ($hour >= 13? ($hour-12) : $hour),$minute,($hour >=13 ? 'PM':'AM') + if ($limits{'time_format_USA'} eq "yes"); + return sprintf "%02d%02d%02d", ($hour%24),$minute,$second + if ($limits{'time_format_HHMMSS'} eq "yes"); + return sprintf "%04d%02d%02d", ($hour%24),$minute,$second + if ($limits{'time_format_HHHHMMSS'} eq "yes"); + return "UNKNOWN FORMAT"; +} + sub make_date_r { my $year=shift; my $month=shift; diff --git a/sql-bench/server-cfg.sh b/sql-bench/server-cfg.sh index 589ce519a86..55371431152 100644 --- a/sql-bench/server-cfg.sh +++ b/sql-bench/server-cfg.sh @@ -170,6 +170,7 @@ sub new $limits{'unique_index'} = 1; # Unique index works or not $limits{'working_all_fields'} = 1; $limits{'working_blobs'} = 1; # If big varchar/blobs works + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. # Some fixes that depends on the environment if (defined($main::opt_create_options) && @@ -216,6 +217,13 @@ sub version $version="MySQL $row[0]"; } $sth->finish; + + $sth = $dbh->prepare("show status like 'ssl_version'") or die $DBI::errstr; + if ($sth->execute && (@row = $sth->fetchrow_array)) + { + $version .= "/$row[1]"; + } + $sth->finish; $dbh->disconnect; $version .= "/ODBC" if ($self->{'data_source'} =~ /:ODBC:/); return $version; @@ -413,6 +421,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -614,6 +623,7 @@ sub new $limits{'unique_index'} = 1; # Unique index works or not $limits{'working_all_fields'} = 1; $limits{'working_blobs'} = 1; # If big varchar/blobs works + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -891,6 +901,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -1121,6 +1132,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -1392,6 +1404,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; @@ -1636,6 +1649,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -1850,6 +1864,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -2034,6 +2049,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -2229,6 +2245,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -2460,6 +2477,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; @@ -2663,6 +2681,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -2817,7 +2836,7 @@ sub new $limits{'subqueries'} = 1; # Supports sub-queries. $limits{'left_outer_join'} = 1; # Supports left outer joins $limits{'table_wildcard'} = 1; # Has SELECT table_name.* - $limits{'having_with_alias'} = 1; # Can use aliases in HAVING + $limits{'having_with_alias'} = 0; # Can use aliases in HAVING $limits{'having_with_group'} = 1; # Can use group functions in HAVING $limits{'like_with_column'} = 1; # Can use column1 LIKE column2 $limits{'order_by_position'} = 1; # Can use 'ORDER BY 1' @@ -2826,6 +2845,7 @@ sub new $limits{'alter_add_multi_col'}= 0; # Have ALTER TABLE t add a int,add b int; $limits{'alter_table_dropcol'}= 1; # Have ALTER TABLE DROP column $limits{'insert_multi_value'} = 0; # Does not have INSERT ... values (1,2),(3,4) + $limits{'multi_distinct'} = 0; # Does not allow select count(distinct a),count(distinct b).. $limits{'group_func_extra_std'} = 0; # Does not have group function std(). @@ -2840,8 +2860,9 @@ sub new $limits{'unique_index'} = 1; # Unique index works or not $limits{'insert_select'} = 1; $limits{'working_blobs'} = 1; # If big varchar/blobs works - $limits{'order_by_unused'} = 1; + $limits{'order_by_unused'} = 0; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -2899,6 +2920,7 @@ sub create { # $field =~ s/ decimal/ double(10,2)/i; # $field =~ s/ big_decimal/ double(10,2)/i; + $field =~ s/ double/ double precision/i; $field =~ s/ tinyint\(.*\)/ smallint/i; $field =~ s/ smallint\(.*\)/ smallint/i; $field =~ s/ mediumint/ integer/i; @@ -3040,6 +3062,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works $limits{'order_by_unused'} = 1; $limits{'working_all_fields'} = 1; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -3242,6 +3265,7 @@ sub new $limits{'group_func_sql_min_str'} = 0; # If you do select f1,f2,f3...f200 from table, Frontbase dies. $limits{'working_all_fields'} = 0; + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; } @@ -3446,6 +3470,7 @@ sub new $limits{'working_blobs'} = 1; # If big varchar/blobs works * $limits{'order_by_unused'} = 1; # $limits{'working_all_fields'} = 1; # + $limits{'multi_distinct'} = 1; # allows select count(distinct a),count(distinct b).. return $self; diff --git a/sql-bench/test-insert.sh b/sql-bench/test-insert.sh index c26ed42f7ed..fa8c4e98b54 100644 --- a/sql-bench/test-insert.sh +++ b/sql-bench/test-insert.sh @@ -112,7 +112,7 @@ do_many($dbh,$server->create("bench1", "id3 int NOT NULL", "dummy1 char(30)"], ["primary key (id,id2)", - "index index_id3 (id3)"])); + "index ix_id3 (id3)"])); if ($opt_lock_tables) { @@ -1340,9 +1340,9 @@ if (($opt_fast || $opt_fast_insert) && $server->{'limits'}->{'insert_multi_value { $id= $i & 127; $rand=$random[$i]; - $tmp="($id,$id,$rand," . ($i & 32766) . ",'ABCDEF$rand',0,"; + $tmp="($id,$id,$rand," . ($i & 32766) . ",'ABCDEF$rand',0,$rand,$rand.0,"; - for ($j=6; $j <= $fields ; $j++) + for ($j=8; $j <= $fields ; $j++) { $tmp.= ($types[$j] == 0) ? "$rand," : "'$rand',"; } @@ -1366,9 +1366,9 @@ else $id= $i & 127; $rand=$random[$i]; $query="insert into bench1 values ($id,$id,$rand," . ($i & 32767) . - ",'ABCDEF$rand',0,"; + ",'ABCDEF$rand',0,$rand,$rand.0,"; - for ($j=6; $j <= $fields ; $j++) + for ($j=8; $j <= $fields ; $j++) { $query.= ($types[$j] == 0) ? "$rand," : "'$rand',"; } diff --git a/sql-bench/test-select.sh b/sql-bench/test-select.sh index a5ae1da7283..a5de042cab1 100644 --- a/sql-bench/test-select.sh +++ b/sql-bench/test-select.sh @@ -355,19 +355,22 @@ if ($limits->{'group_distinct_functions'}) print " for count_distinct ($count:$rows): " . timestr(timediff($end_time, $loop_time),"all") . "\n"; - $loop_time=new Benchmark; - $rows=$estimated=$count=0; - for ($i=0 ; $i < $opt_medium_loop_count ; $i++) - { - $count++; - $rows+=fetch_all_rows($dbh,"select count(distinct grp),count(distinct rev_idn) from bench1"); - $end_time=new Benchmark; - last if ($estimated=predict_query_time($loop_time,$end_time,\$count,$i+1, +# Workaround mimer's behavior + if (limits->{'multi_distinct'} == 1 ) { + $loop_time=new Benchmark; + $rows=$estimated=$count=0; + for ($i=0 ; $i < $opt_medium_loop_count ; $i++) + { + $count++; + $rows+=fetch_all_rows($dbh,"select count(distinct grp),count(distinct rev_idn) from bench1"); + $end_time=new Benchmark; + last if ($estimated=predict_query_time($loop_time,$end_time,\$count,$i+1, $opt_medium_loop_count)); - } - print_time($estimated); - print " for count_distinct_2 ($count:$rows): " . - timestr(timediff($end_time, $loop_time),"all") . "\n"; + } + print_time($estimated); + print " for count_distinct_2 ($count:$rows): " . + timestr(timediff($end_time, $loop_time),"all") . "\n"; + } $loop_time=new Benchmark; $rows=$estimated=$count=0; diff --git a/sql/ChangeLog b/sql/ChangeLog deleted file mode 100644 index a75e9761766..00000000000 --- a/sql/ChangeLog +++ /dev/null @@ -1,3307 +0,0 @@ -2000-12-07 Jeremy Cole <jeremy@mysql.com> - -* Added UPDATE ... ORDER BY ... -* Added DELETE ... ORDER BY ... - -2000-11-11 Jeremy Cole <jeremy@mysql.com> - -* Added ALTER TABLE ... ORDER BY ... - -2000-09-17 Michael Widenius <monty@mysql.com> - -* Added option QUICK to DELETE to tell MySQL not to balance the - trees on delete. - -2000-09-15 Michael Widenius <monty@mysql.com> - -* Added a thd argument to log::write() to get more speed. - -2000-09-01 Michael Widenius <monty@mysql.com> - -* Avoid allocation of "localhost" string. -* Changed that TIMESTAMP(X) is sometimes as string -* Release of 3.23.23 - -2000-08-21 Michael Widenius <monty@mysql.com> - -* Added RENAME TABLE. - -2000-08-20 Michael Widenius <monty@mysql.com> - -* Added memory as inline functions to THD to get them a bit faster -* Don't count entries with NULL in COUNT(DISTINCT ..) - -2000-08-08 Michael Widenius <monty@mysql.com> - -* Changed ALTER TABLE and LOAD DATA INFILE to create non unique, small keys - after all rows are inserted. -* Fixed use of UDF function with const arguments in WHERE clause. - -2000-07-11 Michael Widenius <monty@mysql.com> - -* Extended safe_mysqld; Patch by Christian Hammers - -2000-07-04 Michael Widenius <monty@mysql.com> - -* Changed the update log to take the query length argument; This - should make the update log \0 safe. - -2000-06-21 Michael Widenius <monty@mysql.com> - -* Added net_read_timeout and net_write_timeout as startup parameters to mysqld - -2000-06-19 Michael Widenius <monty@mysql.com> - -* Changed the copyright of MySQL to GPL and LGPL. -* Added myisampack and pack_isam to the MySQL distribution. - -2000-06-01 Michael Widenius <monty@mysql.com> - -* Added "FLUSH TABLES WITH READ LOCK" command - -2000-05-31 Michael Widenius <monty@mysql.com> - -* Added table locks to Berkeley DB. - -2000-05-28 Michael Widenius <monty@mysql.com> - -* Allow ON and USING with INNER JOIN. - -2000-05-23 Sasha - -* Fix that USE INDEX with 'PRIMARY' keys works. - -2000-05-20 Michael Widenius <monty@tik.pp.sci.fi> - -* Added symbolic links support for Win32. - -2000-05-19 Michael Widenius <monty@tik.pp.sci.fi> - -* Changed protocol to let client know if the server is in AUTOCOMMIT mode - and if there is a pending transaction. If there is a pending transaction - the client library will give an error before reconnecting to the server to - let the client know that the server did a rollback. - The protocol is still backward compatible with old clients -* 'kill' now works on a thread that is locked on a 'write' to a dead client. - -2000-05-18 Michael Widenius <monty@tik.pp.sci.fi> - -* unlock tables before sending last packet of SELECT ... result to client. - -2000-05-16 Michael Widenius <monty@mysql.com> - -* split Item_bool_func2::compare function into individual functions to get more - speed. -* Small optimizations of do_select() to get more speed. - -2000-05-15 Michael Widenius <monty@mysql.com> - -* CHECK will update the statistics for the keys. -* Fixed bug in REPAIR TABLE when the table was used by other threads. - -2000-05-11 Michael Widenius <monty@mysql.com> - -* put CREATE TEMPORARY TABLE commands in the update log. -* UPDATE IGNORE will not abort if an update gives a DUPLICATE_KEY error. -* Ensure that all fn_format() or unpack_filename() is called for all - generated filenames. - -2000-05-05 Michael Widenius <monty@mysql.com> - -* Added timzone variable to SHOW VARIABLES. - -2000-05-04 Michael Widenius <monty@mysql.com> - -* Don't write INSERT DELAYED to update log if SQL_LOG_UPDATE=0 - -2000-05-03 Michael Widenius <monty@mysql.com> - -* Fixed problem with REPLACE on HEAP tables. - -2000-04-26 Michael Widenius <monty@mysql.com> - -* Added 'Writing to net' and 'Reading from net' as 'status' to - mysqladmin processlist. - -2000-04-23 Michael Widenius <monty@mysql.com> - -* Added CREATE DATABASE and DROP DATABASE to the update log -* Fixed problem when doing a GROUP BY on an enum column with MANY - value combinations. -* Avoid sorting for some simple GROUP BY queries. - -2000-04-22 Michael Widenius <monty@mysql.com> - -* Fixed problems in update log when using LAST_INSERT_ID() to update - an table with an auto_increment key. -* New function: 'NULLIF(expr1,expr2)' - -2000-04-14 Michael Widenius <monty@tik.pp.sci.fi> - -* UPDATE and DELETE on UNIQUE keys, where the whole key is used in the WHERE - part, are now faster than before. - -* Added optimisation to skip ORDER BY parts where the order by column - is a constant expression in the WHERE part. ORDER BY will also - be skipped if ORDER BY matches a key where the key parts that are - missing in the ORDER BY is constants: - - In the following case the ORDER BY will be removed: - SELECT * FROM foo WHERE column=constant ORDER BY column; - - In the following case the first key will be used to solve the ORDER BY: - SELECT * FROM foo WHERE key_part1=const ORDER BY key_part2; - -2000-04-10 Michael Widenius <monty@mysql.com> - -* Changed mysql.server to wait until the pid file is deleted on stop -* Clients will automaticly be set to the same character set as the - server if one hasn't specified a character set with mysql_option() - or in the my.cnf files. - -2000-04-09 Michael Widenius <monty@mysql.com> - -* Release of 3.23.14 -* Fixed bug where complex CONCAT() use returned the wrong result. - -2000-04-07 Michael Widenius <monty@mysql.com> - -* Added some optimization to LIMIT when the used KEY matches almost all - rows in the table. (SELECT * from table where key_column > "a" LIMIT 1). -* REPLACE now honors the LOW_PRIORITY_UPDATES flag. - -2000-04-05 Michael Widenius <monty@mysql.com> - -* Fixed that DROP TABLE is logged in the update log. -* Fixed problem when searching on DECIMAL() key field - where the column data contained pre-zeros. - -2000-04-02 Michael Widenius <monty@mysql.com> - -* Fix bug in myisamchk when the auto_increment isn't the first key. - -2000-03-30 "Thimble Smith" <tim@mysql.com> - -* Allow DATETIME in ISO8601 format: 2000-03-12T12:00:00 - -2000-03-30 Michael Widenius <monty@mysql.com> - -* Added UMASK_DIR environment variable. -* Fixed problem with seek and RAID tables. - -2000-03-29 Michael Widenius <monty@mysql.com> - -* slow_queries log wasn't flushed on FLUSH LOGS. - -2000-03-28 Michael Widenius <monty@mysql.com> - -* Fix that DELETE FROM table_name; works on RAID tables. -* Fix that DROP DATABASE works correctly with RAID tables. - -2000-03-27 Michael Widenius <monty@mysql.com> - -* Added function CONNECTION_ID() - -2000-03-26 Michael Widenius <monty@mysql.com> - -* When using = on BLOB or VARCHAR BINARY keys where only a part of the column - was indexed, the whole column of the result row wasn't compared. - -2000-03-24 takeshi@SoftAgency.co.jp - -* Fix for sjis & order by - -2000-03-23 Michael Widenius <monty@mysql.com> - -* Added patches to allow client library to compile on BEOS. - -2000-03-16 Michael Widenius <monty@monty.pp.sci.fi> - -* Added STDCALL to some functions in libmysql that missed this. -* When running in ANSI mode, don't allow one to use columns that isn't in - the GROUP BY part. - -2000-03-14 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.23.13 -* Removed end space from double/float numbers in results from temporary - tables. - -2000-03-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed automatic removal of table locks if doing a DROP TABLE on the last - locked table. - -2000-03-13 Sasha - -* Added CHECK TABLE command. - -2000-03-12 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed int2str and longlong2str to use the optimized - int10_to_str / longlong10_to_str functions. - -2000-03-09 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed bug so that mysqladmin shutdown will wait for the local server to close - down. -* Fixed a possible endless loop when calculating timestamp. - -2000-02-27 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.23.12 -* Changed that mysql_ping() doesn't increment the 'questions' status variable. -* Fixed that mysql -D database doesn't kill 'mysql'. - -2000-02-24 Michael Widenius <monty@monty.pp.sci.fi> - -* Only allow SHOW GRANTS if you have a privilege on the mysql - tables -* Fixed bug when storing 0 into a timestamp. - -2000-02-23 Michael Widenius <monty@monty.pp.sci.fi> - -* When doing mysqladmin shutdown on a local connection, mysqladmin now - waits until the pidfile is gone before doing an shutdown. -* Changed that the pid file is not removed until all threads have died. - -2000-02-23 Matt Wagner - -* When doing mysqladmin shutdown on a local connection, mysqladmin now - waits until the pidfile is gone before doing an shutdown. - -2000-02-23 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with LEFT JOIN and key_field IS NULL. - -2000-02-23 Sasha - -* Fixed core dump with some COUNT(DISTINCT ...) queries. - -2000-02-21 Michael Widenius <monty@monty.pp.sci.fi> - -* Added options USE KEYS (key_list) and IGNORE KEYS (key_list) as - join parameters in SELECT. -* DROP of table is now done through the handler. - -2000-02-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Added ANSI SQL syntax ALTER TABLE ADD (column_def1, column_def2 ...) - -2000-02-16 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with optimizer that could sometimes use wrong keys - -2000-02-15 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed that GRANT/REVOKE ALL PRIVILEGES doesn't affect GRANT OPTION -* Removed extra ) from the output of SHOW GRANTS - -2000-02-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem when storing numbers in timestamps. -* Fix problem with timezones that has half hour offsets. -* Storage of numbers in timestamp columns are now faster. - -2000-02-11 Michael Widenius <monty@monty.pp.sci.fi> - -* Allow the syntax UNIQUE INDEX in CREATE statements. - -2000-02-10 Michael Widenius <monty@monty.pp.sci.fi> - -* Added options --i-am-a-dummy and --safe-updates to mysql.cc -* Added variables select_limit and max_join_size to mysql.cc -* Added sql variables: SQL_MAX_JOIN_SIZE and SQL_SAFE_UPDATES -* Added READ_LOCAL lock that doesn't lock the table for concurrent inserts -* Changed that LOCK TABLES .. READ doesn't anymore allow concurrent inserts -* Added option --skip-delay-key-write to mysqld. - -2000-02-09 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed security problem in the protocol regarding password checking. - -2000-02-03 Michael Widenius <monty@tik.pp.sci.fi> - -* Allow 'end' as a field name. -* Added _rowid as an alias for an auto_increment column. - -2000-01-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Ignore empty queries in mysql when running in batch mode - (To be able to handle rows with double ';' chars). - -2000-01-27 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with timestamps and INSERT DELAYED - -2000-01-26 Michael Widenius <monty@tik.pp.sci.fi> - -* Fixed problem that affected queries that did arithmetic on GROUP functions. - -2000-01-24 Michael Widenius <monty@tik.pp.sci.fi> - -* Don't give a unnecessary GRANT error when using tables from many - databases in the same query. - -2000-01-20 Michael Widenius <monty@tik.pp.sci.fi> - -* Fixed that 'date_column BETWEEN const_date AND const_date' works. - -2000-01-19 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem when only changing a 0 to NULL in a table with BLOB/TEXT - columns. -* Fixed bug in range optimizer when using many key parts and or on the middle - key parts: WHERE K1=1 and K3=2 and (K2=2 and K4=4 or K2=3 and K4=5) -* Added the virtual VIO interface to the mysql connection streams. - (This will make it possible to use SSL through the VIO classe interface) - -2000-01-14 Michael Widenius <monty@monty.pp.sci.fi> - -* Added command 'source' to mysql to allow reading of batch files inside - mysql. Original patch by Matthew Vanecek. - -2000-01-12 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed bug that a change of all VARCHAR columns to CHAR columns didn't change - row type from dynamic to fixed. - -2000-01-11 Michael Widenius <monty@monty.pp.sci.fi> - -* Added print of default arguments options to all clients. -* Added --log-slow-queries to mysqld to log all queries that takes a - long time to a separate log file with a time of how long the query took. -* Fixed critical problem with the WITH GRANT OPTION option. -* Added read-next-on-key to HEAP tables. This should fix all - problems with HEAP tables when using not UNIQUE keys. -* Disabled floating point exceptions for FreeBSD to fix core dump when - doing SELECT floor(pow(2,63)); - -2000-01-07 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed core dump when doing WHERE key_column=RAND(...) - (Note that this query can never use keys as the RAND() function must be - re-evaluated for each row) -2000-01-04 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed optimization bug in SELECT .. LEFT JOIN ... key_column IS NULL, when - key_column could contain NULL values. -* Fixed problem with 8 bit characters as separators in LOAD DATA INFILE. - -2000-01-02 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.23.8 - -1999-12-31 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed GRANT problem when doing 'CREATE TABLE ... SELECT' - -1999-12-30 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with timezones that are < GMT -11 -* Fixed problem with ISAM when doing some ORDER BY .. DESC queries. - -1999-12-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed bug when doing a join on a text key which didn't covert the whole key. -* Option --delay-key-write didn't enable delayed key writing -* Fixed update of TEXT column which only involved case changes. - -1999-12-27 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed that INSERT DELAYED doesn't update timestamps that are given. - -1999-12-25 Michael Widenius <monty@monty.pp.sci.fi> - -* Added function yearweek() and options 'x', 'X', 'v' and 'V' to date_format() - -1999-12-22 Michael Widenius <monty@tik.pp.sci.fi> - -* Fixed problem with MAX(indexed_column) and HEAP tables. -* Fixed problem with BLOB NULL keys and LIKE "prefix%". - -1999-12-20 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with MyISAM and fixed length rows < 5 bytes. - -1999-12-10 Michael Widenius <monty@monty.pp.sci.fi> - -* Added RAID support (patch from Tõnu Samuel) - -1999-12-02 Michael Widenius <monty@monty.pp.sci.fi> - -* Added -O interactive_timeout to mysqld. -* Changed the argument of mysql_data_seek to ulonglong from ulong. - -1999-11-30 Michael Widenius <monty@monty.pp.sci.fi> - -Fixed bug in replace() on Alpha. Patch by 'Tom Holroyd' -Fixed bug in LOAD DATA LOCAL INFILE on Alpha. Patch by 'Tom Holroyd' - -1999-11-29 Michael Widenius <monty@monty.pp.sci.fi> - -* Added detection of pthread_attr_stacksize() in configure. -* Added variable net_retry_count (needed for FreeBSD). - -Sun Nov 28 20:55:45 1999 Michael Widenius <monty@bitch.pp.sci.fi> - -* Added option '--verbose' to mysqladmin - -1999-11-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem when converting heap to myisam. -* Fixed bug in HEAP tables when doing insert + delete + insert + scan the - table. - -1999-11-23 Michael Widenius <monty@monty.pp.sci.fi> - -* Fix core dump when releasing a lock from a non existing table -* Remove locks on tables before starting to remove duplicates. -* Added patch to make most string functions multi-byte safe (by Wei He) -* Added Bytes_recieived/Bytes_sent statistics (by Sasha Pachev) -* Added optimization of read_next() with MyISAM -* Changed MyISAM to use concurrent inserts. - -1999-11-21 Michael Widenius <monty@monty.pp.sci.fi> - -* Inverted flag 'delayed_key_write' on 'show variables' - -1999-11-20 Michael Widenius <monty@monty.pp.sci.fi> - -* Added variable max_write_lock_count - -1999-11-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.23.6 -* Made floor() overflow safe on FREEBSD. -* Allow quoting of identifers with ` -* Temporary tables now start with #sql -* Added option --quote-names to mysqldump. -* Added option --ansi to change " to a identifier delimiter and || to - string concatenation. -* Fixed INTO DUMPFILE to give better error messages. NULL is now written - as an empty string. -* Changed Field_double and double->string to use snprintf() to avoid overflows. -* Fixed bug that one could make a part of a PRIMARY KEY not null. -* Fixed encrypt() to be thread safe and not reuse buffer. - -1999-11-11 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed that FLOAT(X) where X <= 24 -> FLOAT and X <= 53 -> DOUBLE. -* Changed DECIMAL(X) to be DECIMAL(X,0) and DECIMAL to be DECIMAL(10,0) - -1999-11-09 Michael Widenius <monty@monty.pp.sci.fi> - -* Added mysqld option -O lower_case_table_names=[0|1] to force table - names to lower case. -* Added mysql_odbc_escape_string() function to support big5 characters in - MyOBC. - -1999-11-08 Michael Widenius <monty@monty.pp.sci.fi> - -* Added patch by Sasha for user defined variables. -* Changed that FLOAT and DOUBLE (without any length modifiers) are - not anymore fixed decimal point numbers. - -1999-10-22 Michael Widenius <monty@tik.pp.sci.fi> - -* Added option ROW_FORMAT=[default, dynamic, static, compressed] to - CREATE_TABLE - -1999-10-20 Michael Widenius <monty@monty.pp.sci.fi> - -* 'DELETE FROM table_name' didn't work on temporary tables - -1999-10-18 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of MySQL 3.23.5 -* Fixed problem with LIKE "%const" - -1999-10-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Added bit function ~ (neg) - -1999-10-14 Michael Widenius <monty@monty.pp.sci.fi> - -* Added support for the GBK Chinese character set (by Wei He) - -1999-10-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Storage of date results is now much faster to date and datetime columns. - -1999-10-12 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed bug when using DISTINCT + ORDER BY RAND() -* new option --relative to mysqladmin. - -1999-10-11 Michael Widenius <monty@monty.pp.sci.fi> - -* Added some error messages in mysqld.cc -* Allow use of NATIONAL and NCHAR when defining character columns. - (They don't do anything) -* Don't allow NULL columns in PRIMARY KEY:s (only in UNIQUE keys) - -1999-10-10 Michael Widenius <monty@monty.pp.sci.fi> - -* Clear LAST_INSERT_ID if in uses this in ODBC context: - WHERE auto_increment_column IS NULL; -* 'SET SQL_AUTO_IS_NULL=0|1' now turns off/on the above handling of - auto_increment columns - -1999-10-09 Michael Widenius <monty@monty.pp.sci.fi> - -* Added parameter 'concurrency' for Solaris. - -1999-10-07 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem when using an auto_increment column in two keys - -1999-10-06 Michael Widenius <monty@monty.pp.sci.fi> - -* AS on fieldname with CREATE TABLE table_name SELECT ... didn't work. - -1999-10-01 Michael Widenius <monty@tik.pp.sci.fi> - -* LIKE with many % ("%xxx%yy%zz%") are now much faster. - -1999-09-24 Michael Widenius <monty@monty.pp.sci.fi> - -* Fix privilege check for LOAD DATA REPLACE . - -1999-09-22 Michael Widenius <monty@monty.pp.sci.fi> - -* Added SHOW GRANT FOR user (by Sinisa) -* Added date + INTERVALL # date_interval_type - -1999-09-19 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with index optimzation with 'WHERE index is not null' - -* Allow creation of temporary tables with same name as original table. -* When granting user a grant option for a database, he couldn't grant - privileges to other users. - -1999-09-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Inserting a DATETIME into a TIME column will not anymore try to store 'days' - in it. -* Fixed problem with storage of float/double on low endian machines. - -1999-09-08 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.23.3 -* Added limit to UPDATE -* Added client library function: mysql_change_user() - -1999-09-07 Michael Widenius <monty@monty.pp.sci.fi> - -* Added character set to 'show variables' -* Added support of '--[white-space]' as comment -* Allow 'INSERT into table_name VALUES ();' - -1999-09-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Add mysqld option --delay-key-write to mysqld.cc - -1999-08-30 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with COUNT(DISTINCT) and GROUP BY - -1999-08-29 Michael Widenius <monty@monty.pp.sci.fi> - -* Added /*!version */ -* Fixed core dump with empty blob to reverse() -* Fixed problem with year(now()) and year(curdate()). - -1999-08-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Added construct: - - CASE value WHEN [compare-value] THEN result - [WHEN [compare-value] THEN result ...] - [ELSE result] - END - - CASE WHEN [condition] THEN result - [WHEN [condition] THEN result ...] - [ELSE result] - END -1999-08-19 Michael Widenius <monty@tik.pp.sci.fi> - -* Added check of arguments to acos() and asin(). -* unique_column IS NULL only returned the first row with NULL. - -1999-08-12 Michael Widenius <monty@tik.pp.sci.fi> - -* REGEXP(...,NULL) will not return an error anymore. - -* Removed ifdef mSQL_COMPLIANT when comparing NULL to NULL - -1999-08-05 Michael Widenius <monty@monty.pp.sci.fi> - -* Fix problem with LOCK TABLES and DELETE FROM table. - -1999-08-04 Michael Widenius <monty@monty.pp.sci.fi> - -* Don't pack all keys even if one key is packed when not using PACK_KEYS=1. - -1999-08-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed core-dump bug when inserting table or column grant on user name "" - -1999-08-02 Michael Widenius <monty@monty.pp.sci.fi> - -* Fix problem with LOCK TABLES when no database is selected. -* New functions: MD5(), (by Tõnu Samuel) and EXPORT_SET (by Sasha Pachev) -* Changed Socket to my_socket (to avoid conflicts) - -1999-07-29 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with DISTINCT on BLOB column -* new keywords: CASE, THEN, WHEN, ELSE, END -* The CASE operator (by Tõnu Samuel) (not yet working) -* set SQL_LOW_PRIORITY_UPDATES=# didn't work -* Fixed range optimizer bug in - SELECT * FROM table_name WHERE key_part1 >= const AND (key_part2 = const OR key_part2 = const) - -1999-07-26 Michael Widenius <monty@tik.pp.sci.fi> - -* One can now update indexes columns that are used in the WHERE clause. - UPDATE tbl_name SET KEY=KEY+1 WHERE KEY > 100; - -1999-07-25 Michael Widenius <monty@tik.pp.sci.fi> - -* Added get_date() function to all item and fields. This makes date handling - a lot faster! -* Added handling of fuzzy dates (dates where day or month is 0) - -1999-07-21 Michael Widenius <monty@tik.pp.sci.fi> - -* Fixed optimization of SELECT ... WHERE key_part1=const1 and key_part_2=const2 and key_part1=const4 and key_part2=const4 - (indextype should be range instead of ref) - -1999-07-20 Michael Widenius <monty@tik.pp.sci.fi> - -* Changed handling of 'const_item' to allow handling of - ORDER BY RAND(). -* MyISAM tables now allows keys on NULL and BLOB columns. -* Optimize the following LEFT JOIN: - SELECT ... FROM t1 LEFT JOIN t2 ON ... WHERE t2.not_null_column IS NULL - -1999-07-19 Michael Widenius <monty@tik.pp.sci.fi> - -* Added ORDER BY and GROUP BY with functions -* Changed all handling of tables in sql_select.cc to use table_map instead - of table_nr. -* Added use of column_name = formula to use keys -* column_name = column_name2 don't anymore have to have identical packing -* field IS NULL can now use keys - -1999-07-16 Michael Widenius <monty@tik.pp.sci.fi> - -* Changed heap tables to be stored in low_byte_first order (to make it easy - to convert to MyISAM tables) -* Automatic change of HEAP temporary tables to MYISAM tables in case of - 'table is full' errors. -* Added option --init-file=file_name to mysqld - -1999-07-15 Michael Widenius <monty@tik.pp.sci.fi> - -* Added COUNT(DISTINCT value,[value,...]) - -1999-07-14 Michael Widenius <monty@tik.pp.sci.fi> - -* changed name of temporary table to include getpid(). -* Added full support for CREATE TEMPORARY - -1999-07-04 Michael Widenius <monty@monty.pp.sci.fi> - -* Added CREATE TABLE options 'CHECKSUM' and 'PACK_KEYS' -* Added mysqld option --default-table-type -* Added column 'packed' to 'show index' -* Added pack_keys and checksum to show table status - -1999-07-01 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.23.0 -* Show NULL as the default value for AUTO_INCREMENT columns. -* Fixed optimizer bug with tables with only one row. -* Fixed bug when using LOCK TABLES table_name READ; FLUSH TABLES; - -1999-06-30 Michael Widenius <monty@monty.pp.sci.fi> - -* Added use of LIBWRAP (by "Henning P . Schmiedehausen" <hps@tanstaafl.de>) - -1999-06-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Don't allow AUTO_INCREMENT for other than numerical columns -* Using AUTO_INCREMENT will now automaticly make the column NOT NULL. - -1999-06-22 Michael Widenius <monty@tik.pp.sci.fi> - -* Added privilege column to 'show columns' - -1999-07-13 Michael Widenius <monty@tik.pp.sci.fi> - -* Added SQL_BIG_RESULT (SQL_SMALL_RESULT is now default) -* Use the MYISAM UNIQUE constraint to solve SELECT DISTINCT faster. - -1999-06-06 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed most macros in the libmysql library to functions to avoid many - versions of shared libraries. - -1999-05-16 Michael Widenius <monty@tik.pp.sci.fi> - -* Added "Row_type" to SHOW TABLE STATUS. - -1999-05-15 Michael Widenius <monty@monty.pp.sci.fi> - -* Added option IF NOT EXISTS to CREATE TABLE -* Allow creation of CHAR(0) columns. - -1999-05-14 Michael Widenius <monty@monty.pp.sci.fi> - -* Added more error checking of errors from the table handler. - -1999-05-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Added the '<=>' operator which will act as '=' but will return TRUE if both - arguments are NULL. - -1999-05-12 Michael Widenius <monty@monty.pp.sci.fi> - -* The default base for the log, update-log and pid-file name is now - 'hostname' with everything after the first '.' removed. - -1999-05-11 Michael Widenius <monty@monty.pp.sci.fi> - -* Require '%' before format characters in DATE_FORMAT(). -* Add logging of GRANT and SET PASSWORD in the update log. - -1999-05-10 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed LIKE compare to behave as =; This means that 'e' LIKE 'é' is now - true. - -1999-05-10 Michael Widenius <monty@tik.pp.sci.fi> - -* REPLACE now used direct read to find dupplicate row instead of key read; - This makes REPLACE a lot faster. - -1999-05-05 Michael Widenius <monty@tik.pp.sci.fi> - -* New option: CREATE TABLE SELECT .... -* Added syntax for CREATE TEMPORARY TABLE (not yet implemented) - -1999-05-03 Michael Widenius <monty@tik.pp.sci.fi> - -@code{DESCRIBE TABLE} returns a lot of information about the tables - -1999-05-02 Michael Widenius <monty@monty.pp.sci.fi> - -* Added comments to tables -* Added UNIQUE, in CREATE TABLE table_name (col int not null UNIQUE); - -1999-04-29 Michael Widenius <monty@monty.pp.sci.fi> - -* Use auto_increment value provided by MYISAM -* Use key_part statistics if available - -1999-04-28 Michael Widenius <monty@monty.pp.sci.fi> - -* null bits are now stored at start of row instead at the end. - (Now we only need one bit to mark a row deleted) - -* DELAYED is now a reserved words. (because of conflicts from yacc) - -1999-04-20 Michael Widenius <monty@monty.pp.sci.fi> - -* Added patches for DEC_3_2 by "Andrea Suatoni" <and@itaca.it> - -1999-04-19 Jani Tolonen <jani@monty.pp.sci.fi> - -* Added load_file() function - -1999-04-15 Michael Widenius <monty@monty.pp.sci.fi> - -* Added option --skip-show-databases to mysqld. - -1999-04-10 Michael Widenius <monty@monty.pp.sci.fi> - -* set start time when connection. - -1999-04-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with 'DELETE FROM TABLE' when table was locked by another - thread. - -1999-04-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Check if rows has changed now also works with BLOB/TEXT. -* Added the INNER JOIN syntax; This made 'INNER' a reserved word. - -1999-04-02 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with 'Host '..' is not allowed to connect to this MySQL - server' after one had inserted a new MySQL user with a GRANT command. - -1999-04-01 Michael Widenius <monty@monty.pp.sci.fi> - -* Added support for netmasks to the hostname in the MySQL tables. - -1999-03-31 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed net.cc to use TCP_NODELAY also on Linux. -* If one compares a NOT NULL DATE/DATETIME column with IS NULL, this - is changed to a compare against 0 to satisfy some ODBC applications. - (By shreeve@uci.edu) - -1999-03-30 Michael Widenius <monty@monty.pp.sci.fi> - -* NULL IN (...) now returns NULL instead of 0. - This will ensure that 'null_column NOT IN (...)' doesn't match NULL values. -* Changed the mysql.db entry to char(60). - -1999-03-16 Michael Widenius <monty@monty.pp.sci.fi> - -* Fix storage of floating point values in TIME columns -* Changed parsing of TIME strings to be more strict. Now the fractional - second part is detected (and currently skipped) - The following formats are supported - [[[DAYS] [H]H:]MM:]SS[.fraction] and [[[[H]H]H]H]MM]SS[.fraction] -* Detect (and ignore) second fraction part from DATETIME - -1999-03-10 Michael Widenius <monty@monty.pp.sci.fi> - -* On Win32 detect --basedir automaticly from path to mysqld. -* Added option --skip-column-names to mysql. -* Added some memory checks in sql_string.cc - -1999-03-08 Michael Widenius <monty@monty.pp.sci.fi> - -* Added the ODBC 3.0 EXTRACT(interval FROM datetime) function -* Added lots of 'out of memory' checks for SELECT statements. - -1999-03-05 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed std() for big tables when result should be 0. - -1999-03-04 Michael Widenius <monty@monty.pp.sci.fi> - -* INSERT DELAYED had some garbage at end in the update log. - -1999-03-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Added a lot of casts in filesort.cc to make it more portable. - -1999-02-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed default size of key_buffer to 4M -* Fixed problem with queries that needed temporary tables with blobs. - -1999-02-26 Michael Widenius <monty@monty.pp.sci.fi> - -* Added LOAD DATA [LOW_PRIORITY] INFILE. -* Added option 'flush-time' to force MySQL-Win32 version to flush - the tables once in a while. -* On Linux all process didn't die on shutdown. - -1999-02-18 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed a core dump problem when using --log-update and connecting - without a default database. -* Added more error check if one get an error writing to the log files. - -1999-02-16 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed some configure errors -* If one used @code{LEFT JOIN} on tables that had circular dependencies this - caused mysqld to hang forever. - -1999-02-05 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.22.16 -* mysqladmin processlist could core dump mysqld if a new user logged in. -* DELETE FROM table_name WHERE key_column=column_name didn't find any matching - rows. -* The default index name is now using the same case as the used column name. - -1999-02-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Added the MODIFY attribute to ALTER TABLE (to be compatible with some other - SQL databases) -* Added LIKE to 'show status' - -1999-01-31 Michael Widenius <monty@monty.pp.sci.fi> - -* DATE_ADD(column,...) didn't work. -* INSERT DELAYED could deadlock with status 'upgrading lock' - -1999-01-30 Michael Widenius <monty@monty.pp.sci.fi> - -* Extended item_encrypt() to take longer salt strings than 2 characters. - (for FreeBSD) - -1999-01-26 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.22.15 -* LIKE on binary strings didn't work if one used a multi-byte character set. -* mysqladmin -w will now wait for the server to come up if it's killed. - -Tue Jan 26 00:06:10 1999 Michael Widenius <monty@bitch.pp.sci.fi> - -* Fixed problem with ORDER BY whith 'only index' optimzation when there - where multiple key definitions for an used column. -* GRANT with password didn't update in memory GRANT table before - 'mysqladmin flush' - -1999-01-20 Michael Widenius <monty@monty.pp.sci.fi> - -* Updating BLOB/TEXT through formulas didn't work for short (< 256 char) - strings. -* Changed option --extended_insert-insert to --extended-insert in mysqldump - -1999-01-19 Michael Widenius <monty@monty.pp.sci.fi> - -* Lots of changes to support INSERT DELAYED. - -1999-01-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed unpacking of DATE and DATETIME; These are now about 5 times faster. - -1999-01-16 Michael Widenius <monty@monty.pp.sci.fi> - -* DATE_ADD with now() or curdate() reused the same string. -* Added BENCHMARK(loop-count,expression) function to time expressions. - -1999-01-14 Michael Widenius <monty@monty.pp.sci.fi> - -* LEFT JOIN USING (col1,col2) gave an error if one used it with tables - from 2 different databases. -* LOAD DATA LOCAL INFILE didn't work in the unix version because of a missing - file in the sql directory -* Fixed problems with VARCHAR/BLOB on very short rows (< 4 bytes); One - could get error 127 when deleting rows. - -1999-01-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Nicer error messages for table types. -* Changed default number of connections to 100 - -1999-01-11 Michael Widenius <monty@monty.pp.sci.fi> - -* When one did a GRANT on a new host mysqld could die on the first connect - from this host. -* Use as default bigger buffers when using 'load data infile'. - -1999-01-06 Michael Widenius <monty@monty.pp.sci.fi> - -* All blob pointers have now reserved 8 bytes in the .frm files; This makes - the .frm files portable to 64 bit architectures. - -* DECIMAL(x,y) now works according to ANSI SQL. - -1998-12-30 Michael Widenius <monty@monty.pp.sci.fi> - -* If one used ORDER BY on column name that was the same name as an alias, - the ORDER BY was done on the alias. - -1998-12-29 Michael Widenius <monty@monty.pp.sci.fi> - -* Added aggregate UDF functions. Thanks to - Andreas F. Bobak <bobak@relog.ch> for this ! - -1998-12-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed sql_crypt() a bit to make it a bit more secure; This will make old - string stored with the old decrypt() function unreadable! - -1998-12-27 Michael Widenius <monty@monty.pp.sci.fi> - -* Allow empty arguments to mysqld to make it easier to start it - from shell scripts! - -1998-12-23 Michael Widenius <monty@monty.pp.sci.fi> - -* last_insert_id() is now updated for INSERT INTO ... SELECT -* Setting a TIMESTAMP column to NULL didn't record the timestamp - value in the update log. - -1998-12-21 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed lock handler bug when one did: - INSERT INTO TABLE ... SELECT ... GROUP BY. -* Added a patch for localtime_r() on Win32 that it will not crash anymore - if your date is > 2039, but instead it will return a time of all zero. -* UDF function names are not longer case sensitive. -* Added escape of '^Z' to \Z as ^Z doesn't work with pipes on Win32 -* Changed optimizer to not use 'range search' in some cases. -* Changed optimizer to use result form 'check_range' in optimization of - searching of part keys. - -1998-12-16 Michael Widenius <monty@monty.pp.sci.fi> - -* SELECT COUNT(*) didn't work on LEFT JOIN queries with only had expressions - in the ON part and there where no WHERE clause. -* Added optional support for crypted frm files. - -1998-12-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Saving NOW(), CURDATE() or CURTIME() directly in a column didn't work. -* SELECT COUNT(*) didn't work on LEFT JOIN queries with only had expressions - in the ON part and no WHERE clause. - -1998-12-09 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed a bug in sql_list.h that made ALTER TABLE dump a core in some context. - -1998-12-08 Michael Widenius <monty@monty.pp.sci.fi> - -* Allow use of negative real numbers without a decimal point. -* day number is now adjusted to max days in month if the resulting month - after DATE_ADD/DATE_SUB() doesn't have enough days. - -1998-12-07 Michael Widenius <monty@monty.pp.sci.fi> - -* Fix that GRANT compares columns case insensitive. -* Add / to TMPDIR if needed. - -1998-12-06 Michael Widenius <monty@monty.pp.sci.fi> - -* Allow GLOBAL as a table or database name. - -Thu Dec 3 10:29:11 1998 Michael Widenius <monty@tik> - -* Added option SQL_SMALL_RESULT to SELECT to force use of fast temporary - tables when one knows that the result set will be small! - -1998-11-27 Michael Widenius <monty@monty.pp.sci.fi> - -* The hostname in user@hostname can now include '.' and '-' without quotes. - -1998-11-26 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem when using DATE_ADD()/DATE_SUB() in a WHERE clause. -* One can now set the password for a user with the - GRANT ... user IDENTIFIED BY 'password' syntax. -* Fixed bug in GRANT checking with SELECT on many tables. -* Removed some 'no Database selected' errors. -* Release of 3.22.11 - -1998-11-21 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed USER() to return user@host -* New command: FLUSH STATUS ; to reset most status variables. -* New status variables: aborted_threads and aborted_connects. - -1998-11-20 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed bug in ORDER BY on FIELD() -* New function make_set() (70% by Jani Tolonen) - -1998-11-18 Michael Widenius <monty@monty.pp.sci.fi> - -* Added functions encrypt() and decrypt(). Because of endspace stripping of - CHAR() and VARCHAR() these should only be used with fixed size strings or - with BLOB/TEXT columns. - -1998-11-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Silently remove DEFAULT values from AUTO_INCREMENT columns. -* Added new variable to mysqld: connection_timeout - -1998-11-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Better error message when table doesn't exists. - -1998-11-12 Michael Widenius <monty@monty.pp.sci.fi> - -* Added option SET SQL_WARNINGS=1 to get a warning count also for simple - inserts. -* IS NULL on a AUTO_INCREMENT column in a LEFT JOIN didn't work. -* MySQL now uses SIGTERM instead of SIGQUIT with shutdown to work better - on FreeBSD. -* Added option \G (print vertically) to mysql -* SELECT HIGH_PRIORITY ... killed mysqld. - -1998-11-11 Michael Widenius <monty@monty.pp.sci.fi> - -* Added grant checking to 'show tables' -* Large changes to get grants integrated with the current privilege system. - -1998-11-10 Michael Widenius <monty@monty.pp.sci.fi> - -* SELECT .. WHERE t1.id1=t2.id2 could fail if t1.id1 and t1.id2 was keys - and of radically differently types. -* Changed get_password to use getpass function. (Patch by Jaromir - Dolecek <dolecek@ics.muni.cz>) - -1998-11-04 Michael Widenius <monty@analytik> - -* Release of 3.22.10 -* Changed +, - (sign and minus), *, /, % and ABS() to be BIGINT aware. -* ALTER TABLE and UPDATE now writes out the values of any duplicated keys. - -1998-11-03 Michael Widenius <monty@monty.pp.sci.fi> - -* ADABASD like INSERT statement: - INSERT INTO table_name SET column=value,column=value... -* The client flag option 'CLIENT_IGNORE_SPACE' didn't work properly. -* Fixed bug in ALTER TABLE that caused a core dump. -* Added optimization of SELECT ... FROM table ORDER BY key_part1 LIMIT ... - This query will now use indexes instead of sorting the table. - -Mon Nov 2 20:52:15 1998 Jani Tolonen <jani@bitch.pp.sci.fi> - -* Added more variables to SHOW STATUS and changed format of output -* Added command extended-status to mysqladmin which will show the - new status - -1998-10-30 Michael Widenius <monty@monty.pp.sci.fi> - -* columns of type date, date_time and 'set' are now stored a little - more efficient if they are 0, NULL or ''. - -1998-10-26 Michael Widenius <monty@monty.pp.sci.fi> - -* Most errors are now printed through sql_write_error() which will add - date, time and thread id to the .err log. - -1998-10-25 Michael Widenius <monty@monty.pp.sci.fi> - -* Added option MYSQL_INIT_COMMAND to mysql_options() to make a query - on connect or reconnect. -* Added option MYSQL_READ_DEFAULT_FILE and MYSQL_READ_DEFAULT_GROUP to - mysql_option() to read the following parameters from the my.cnf file: - "port", "socket", "compress", "password", "pipe", "timeout", "user", - "init-command", "host" and "database" - -* Added maybe_null to the UDF structure - -1998-10-22 Michael Widenius <monty@monty.pp.sci.fi> - -* Added IGNORE to INSERT with many rows. -* Added SQL GRANT commands -* Release of 3.22.9 - -1998-10-18 Michael Widenius <monty@monty.pp.sci.fi> - -* One can new set the last_insert_id() value in an update with - LAST_INSERT_ID(expr). This makes it possible to return a value for things - like: - UPDATE table SET COUNT=LAST_INSERT_ID(COUNT+1) WHERE primary_key_col=# -* display key name used by 'range' in the 'key' column in 'show processlist' -* new SQL command: FLUSH [ TABLES | HOSTS | LOGS | PRIVILEGES ] [, ...] -* new SQL command: KILL thread_id - -Thu Oct 15 18:57:15 1998 Michael Widenius <monty@tik> - -* Reuse memory for identical set and enum fields. - -1998-10-14 Michael Widenius <monty@analytik> - -* Added open file information to mysqladmin debug -* Fixed conversion problem when using ALTER TABLE from a INT to a short CHAR() - column. -* Added 'SELECT HIGH_PRIORITY'; This will get a lock for the SELECT even if - there is a thread waiting another SELECT to get a WRITE LOCK. - NOTE: This makes HIGH_PRIORITY a reserved word - -1998-10-12 Michael Widenius <monty@analytik> - -* Moved wild_compare to string class to be able to use LIKE on BLOB/TEXT columns with \0 -* Added ESCAPE option to LIKE - -1998-10-08 Michael Widenius <monty@monty.pp.sci.fi> - -* Update for AIX: Added a cast to all bzero() calls and changed to use - my_gethostbyname_r instead of gethostbyname_r. - -1998-10-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.22.8 -* Added an extra thread signal loop on shutdown to avoid some error messages - from the client. -* MySQL now uses the next available number as extension for the update - log file. - -1998-09-25 Michael Widenius <monty@monty.pp.sci.fi> - -* MySQL clients on NT will now by default first try to connect with named pipes - and after this with TCP/IP. - -1998-09-24 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problems with TIME columns and negative strings. -* Added a new column 'state' to 'mysqladmin proc' that gives some - information what the thread is doing. - -* DATE_ADD() and DATE_SUB() didn't work with group functions. - -1998-09-23 Michael Widenius <monty@monty.pp.sci.fi> - -* 'mysql' will now also try to reconnect on 'use database' commands. - -* Fix problem with ORDER BY and LEFT JOIN and const tables. - -1998-09-22 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem with ORDER BY if the first ORDER BY column was a key and - the rest wasn't. - -1998-09-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of 3.22.7 -* OPTIMIZE TABLE table_name can now be used to reclaim disk space - after many deletes. This uses currently ALTER TABLE to re-generate - the table, but in the future it will use an integrated isamchk - for more speed. - -1998-09-16 Michael Widenius <monty@monty.pp.sci.fi> - -* Added functions for perfect hashing of symbols. Moved some other things - to the LEX structure for faster setup. -* Changed libmysql.dll on Win32 to use TLS to get better multi-threading - -1998-09-15 Michael Widenius <monty@monty.pp.sci.fi> -* Added --where to mysqldump (patch by Jim Faucette). -* Fixed slow UPDATE/DELETE when using DATETIME or DATE keys. - -1998-09-14 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed some optimizations parameters to make better joins. -* Anyone can now use 'mysqladmin proc' to check ones own - threads. Only users with the 'Process_priv' privilege can get - information about all threads. -* Fixed very unlikely optimizer bug in the range optimizer - (bug introduced in 3.22.6) -* Added handling of formats YYMMDD, YYYYMMDD, YYMMDDHHMMSS to - DATETIME/TIMESTAMP when using numbers. (Before these formats only worked - with strings). - -1998-09-06 Michael Widenius <monty@monty.pp.sci.fi> - -* Added connect option CLIENT_IGNORE_SPACE to allow one to use - space after the function name and before '(' (Powerbuilder requires this). - This will make all function names reserved words. -* comments that start with /*! are now interpreted as commands. This feature - allows one to use MySQL extensions like: - 'SELECT /*! STRAIGHT_JOIN */ * from table1,table1' - in a portable manor. - -1998-09-04 Michael Widenius <monty@analytik> - -* Added SET OPTION INSERT_ID=# to force use of specific INSERT_ID. This is - usable with new --log-long-format option. - -1998-08-31 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed problem when INSERTING into TIME fields. - -1998-08-29 Michael Widenius <monty@monty.pp.sci.fi> - -* Added key cache and handler statistic to 'mysqladmin debug'. -* changed UPDATE and DELETE to not use 'index only' range detection. - (Fixed slow update_key in the benchmarks) -* Changed the insert benchmark because it was impossible to use it with - postgreSQL (to slow). - -Thu Aug 27 15:38:23 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* mysqldump will automaticly use LOAD DATA LOCAL INFILE if one uses - an TCP/IP connection. - -1998-08-27 Michael Widenius <monty@monty.pp.sci.fi> - -* Added support of local files with LOAD DATA LOCAL INFILE .. -* Save history if one kills mysql with ^C. Save history in MYSQL_HISTFILE. - Modfied patch by Tommy Larsen <tommy@mix.hive.no> - -1998-08-26 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed a possible problem with mysql_refresh(). - -Tue Aug 18 14:07:53 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* Give an error for queries that mix GROUP columns and fields when there - is no GROUP BY specification. - -1998-08-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed sql_yacc.yy to allow field attributes in any order. - -1998-08-15 Michael Widenius <monty@monty.pp.sci.fi> - -* Increased max_allowed_packed to 1M as default. -* LOAD DATA INFILE didn't copy single field separators in some case: - "Hello"Atif"!" - -1998-08-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed fatal bug in lpad(). - -Thu Aug 13 01:00:44 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* REGEXP can now take a expression as the second argument. - -1998-08-12 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed LIKE to be faster in some cases with many '%': LIKE '%c%ompiler%' - -1998-08-11 Michael Widenius <monty@monty.pp.sci.fi> - -* All table lock handing is changed to avoid some very subtitle - deadlocks when using DROP TABLE, ALTER TABLE, DELETE FROM TABLE and - mysqladmin flush-tables under heavy usage. - -1998-08-10 Michael Widenius <monty@monty.pp.sci.fi> - -* Allow one to use the syntax 'CONSTRAINT symbol' before FOREIGN KEY. -* new mysqld option '--low-priority-insert' to give inserts lower priority - than selects. -* One can now use {INSERT | REPLACE} LOW_PRIORITY INTO ... - One side effect is that LOW_PRIORITY is now a reserved word :( -* Changed locking code to get better handling of locks of different types. - -1998-08-09 Michael Widenius <monty@monty.pp.sci.fi> - -* mysqld will now ignore trailing ';' characters in queries. This is to - make it easier to emigrate from some other SQL servers that require the - end ';' -* One can now use a LIMIT value with DELETE to make it return after deleting - a given number of rows. -* Fix for corrupted output of fixed format and SELECT INTO OUTFILE: - select * from test into outfile "/tmp/test.txt" fields terminated by '' enclosed by '' - -1998-08-04 Michael Widenius <monty@monty.pp.sci.fi> - -* new mysqld option: '-O max_connect_errors=#'. - Connect errors are now reset for each correct connection. -* Add support for INSERT INTO table ... VALUES(...),(...),(...) - -1998-08-03 Michael Widenius <monty@monty.pp.sci.fi> - -* Added Oracle GREATEST() and LEAST() functions. One must now use - these instead if the MAX() and MIN() functions to get the biggest/smallest - value from a list of values. These can now handle real, bigint and - string values. -* The following query now uses indexing instead of sorting the table: - SELECT ... FROM table ORDER BY key_part1 desc,key_part2 desc,... -* Added check that the error message file has enough error messages. -* DAYOFWEEK() had offset 0 for Sunday. Changed the offset to 1. - -1998-08-02 Michael Widenius <monty@monty.pp.sci.fi> - -* new option to mysql: '--vertical' to print results in vertical mode. -* All count structures in the client (affected_rows, insert_id...) are now of - type BIGINT to allow one to use 64 bit values. - This required a minor change in the MySQL protocol which may affect - old clients when using tables with auto_increment values > 24M. -* The return type of mysql_fetch_lengths() has changed from uint * - to ulong *. This may give a warning for old clients but should work - on most machines. - -Thu Jul 30 15:29:05 1998 Michael Widenius <monty@tik> - -* COUNT(), STD() and AVG() are extended to handle more than 4G rows. - -Wed Jul 29 10:36:05 1998 Michael Widenius <monty@tik> - -* Added new option: - SET OPTION SQL_LOG_UPDATE=[0,1] to allow users with process_priv - privilege to bypass the update log. - (Modified patch from Sergey A Mukhin <violet@rosnet.net>) - -Thu Jul 23 15:58:13 1998 Michael Widenius <monty@tik> - -* Initialize line buffer in mysql.cc to make blob readings from pipes safer. - -Tue Jul 21 22:04:43 1998 Michael Widenius <monty@tik> - -* One can now store -838:59:59 <= x <= 838:59:59 in a TIME column. -* TIME_TO_SEC() and SEC_TO_TIME() can now handle negative times and hours - up to 32767. - -Mon Jul 20 20:34:33 1998 Michael Widenius <monty@tik> - -* Change mysys/dbug to allocate all thread varibles in one struct. - This makes it easier to make a threaded libmysql.dll - -Sun Jul 19 12:54:45 1998 Michael Widenius <monty@tik> - -* Changed ALTER TABLE to make it more multi-thread safe. -* normal INSERT INTO TABLE are now also cached when used with - LOCK TABLES. (previously only INSERT ... SELECT and LOAD DATA INFILE - was cached) - -Fri Jul 17 20:53:23 1998 Michael Widenius <monty@tik> - -* Allow group functions with HAVING: - SELECT col FROM table GROUP BY col HAVING COUNT(*)>0; - -Tue Jul 14 15:11:52 1998 Michael Widenius <monty@tik> - -* Use the result from 'gethostname' as the name for pid files - (instead of uname()). - -Sun Jul 12 12:38:45 1998 Michael Widenius <monty@tik> - -* Index only optimization; Some queries are now resolved using - only indexes. Until MySQL 4.0 this works only for number columns. - - SELECT key_part1,key_part2 FROM table WHERE key_part1=# - SELECT COUNT(*) FROM table WHERE key_part1=# and key_part2=# - SELECT key_part2 FROM table GROUP BY key_part1; - SELECT * FROM table ORDER BY key_part2; - -1998-07-07 Michael Widenius <monty@monty.pp.sci.fi> - -* Added function DATE_ADD() and DATE_SUB() - -1998-07-06 Michael Widenius <monty@monty.pp.sci.fi> - -* Added function SUBSTRING() with 2 arguments. - -1998-07-05 Michael Widenius <monty@monty.pp.sci.fi> - -* Added optimization to remove const reference tables from ORDER BY and - GROUP BY. -* Allow '$' in table and column names. - -1998-07-04 Michael Widenius <monty@monty.pp.sci.fi> - -* new option --tmpdir for mysqld. - -1998-07-03 Michael Widenius <monty@monty.pp.sci.fi> - -* MySQL now automaticly changes a query from an ODBC client: - SELECT ... from table WHERE auto_increment_column IS NULL - to - SELECT ... from table WHERE auto_increment_column == LAST_INSERT_ID(). - This allows some ODBC programs (Delphi, Access) to retrieve the newly - inserted row to fetch the auto_increment id. -* Drop table now waits for all users to free a table before deleting it - -1998-07-02 Michael Widenius <monty@monty.pp.sci.fi> - -* New functions: BIN(), HEX() and CONV() for converting between different - number bases. - -1998-07-01 Michael Widenius <monty@monty.pp.sci.fi> - -* If one created a table with smaller record length than 5, one couldn't - delete rows from this table -* mysqld now automaticly disables system locking on Linux, Win32 and if - one uses MIT-threads. One can force the use of locking by doing: - --enable-locking. -* Added new mysqld option --console, to force a console window (for error - messages) when using Win32. -* Removed a useless check in the ISAM delete code; Delete should now be - a bit faster. - -1998-06-28 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of MySQL 3.22.3 -* New flag to mysqld: --one-thread for debugging with linuxthreads (or glibc) - -1998-06-27 Michael Widenius <monty@monty.pp.sci.fi> - -* Added the LEX structure to THD to get a bit more speed. -* Added DROP TABLE IF EXISTS to not get an error if the table doesn't exists. -* IF and EXISTS are now reserved words (they would have to be sooner or later) - -1998-06-26 Michael Widenius <monty@monty.pp.sci.fi> - -* Added lots of new options to mysqldump. - -Wed Jun 24 23:33:35 1998 Michael Widenius <monty@tik> - -* Server error messages are now in mysqld_errror.h -* Added compression server/client protocol. (By Sinisa). - -1998-06-22 Michael Widenius <monty@monty.pp.sci.fi> - -* New functions: <<, >>, rpad() and lpad(). -* Fixed a core-dump bug in the range optimizer. - -Fri Jun 19 01:51:09 1998 Michael Widenius <monty@tik> - -* One can now save default options (like passwords) in a config file (my.cnf). - -1998-06-17 Michael Widenius <monty@monty.pp.sci.fi> - -* searching on multiple constant keys that matched > 30 % of the rows didn't - always use the best possible key. - -1998-06-16 Michael Widenius <monty@monty.pp.sci.fi> - -* Lot's of small changes to get ORDER BY to work when no records are found - when using fields that are not in GROUP BY (MySQL extension) -* Added new option --chroot to mysqld to start mysqld in a chroot environment - (by Nikki Chumakov <nikkic@cityline.ru>) - -1998-06-15 Michael Widenius <monty@monty.pp.sci.fi> - -* Add option --one-database to mysql to only update one database - from a update log. - -1998-06-13 Michael Widenius <monty@monty.pp.sci.fi> - -* end space is now ignored when comparing case sensitive strings; - This should fix some problems with ODBC! -* mysql_free_result() now automaticly handles a mysql_use_result() set that - is not completely read. - -1998-06-10 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of MySQL 3.22.1 -* Fixed problems with date_format() and wrong dates. -* enum() and set() columns was compared binary; Changed to be case insensitive. - -1998-06-08 Michael Widenius <monty@monty.pp.sci.fi> - -* Added new API functions: mysql_init() and mysql_options(). - One MUST now call mysql_init() before one calls mysql_real_connect(). - One doesn't have to call mysql_init if one only calls mysql_connect(). -* LEFT JOIN core dumped if the second table is used with a constant - WHERE/ON expression with uniquely identifies one record. - -1998-06-07 Michael Widenius <monty@monty.pp.sci.fi> - -* Range optimizer is not used anymore when comparing a string column - to a number. This will make such compares slower but safer. - -Sun Jun 7 04:47:14 1998 Michael Widenius <monty@tik> - -* UPDATE now returns a update information about how many rows was - matched, updated and if one got any 'warnings' when doing the update. - -Sat Jun 6 22:58:02 1998 Michael Widenius <monty@tik> - -* Fixed wrong result from 'format(-100,2)'. - -1998-06-06 Michael Widenius <monty@monty.pp.sci.fi> - -* Added new C-API function: mysql_ping(). -* Added options AFTER column and FIRST to ALTER TABLE ... ADD columns. - This makes is possible to add a new column at some specific location - in an old table. -* Fixed problem with find_in_set(). - -1998-05-18 Michael Widenius <monty@analytik> - -* Added new API function: mysql_ping(). - -1998-05-15 Michael Widenius <monty@monty.pp.sci.fi> - -* WEEK() now takes an optional argument to allow handling of weeks when the - first day of the week = Sunday (default or 0) or Monday ( extra argument is - 1). WEEK() now returns the week number in the range 0-53 for the used - year. - -1998-05-13 Michael Widenius <monty@monty.pp.sci.fi> - -* Added flag -T32 to mysqld for running all queries under the main thread. - This makes it possible to debug mysqld under Linux with gdb! - (This is now called --one-thread) - -1998-05-12 Michael Widenius <monty@monty.pp.sci.fi> - -* Added optimization of 'not_null_column IS NULL' (needed for some Access - queries) -* Made all time functions 'more streamlined'. - -1998-05-09 Michael Widenius <monty@monty.pp.sci.fi> - -* Allow one to use STRAIGHT_JOIN between two tables to force the optimizer - to join them in a specific order. - -Fri May 8 02:35:00 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* Added SET OPTION PASSWORD='new_crypted_password' and - SET OPTION PASSWORD= 'host' : 'user' : 'new_password'. The last version - only works for users with write access to the mysql database. - One can also use: SET OPTION PASSWORD=PASSWORD("new_password"); - -Tue May 5 14:41:47 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* String functions now return VARCHAR() instead of CHAR() and - the column type is now VARCHAR() for fields saved as VARCHAR(). - This should make the MyODBC driver better, but may break some old - MySQL clients that doesn't handle FIELD_TYPE_VARCHAR identical as - FIELD_TYPE_CHAR. - -Mon May 4 00:33:27 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* Added BOOL as a synonym for BIT and DISTINCTROW as a synonym for DISTINCT. -* CREATE INDEX and DROP INDEX are now implemented trough ALTER TABLE. - CREATE TABLE is still the recommended (fast) way to create indexes. -* Added option SET OPTION PASSWORD='new_password'. - mysqladmin can now be used by not anonymous users to change their - password. - -Sun May 3 18:47:24 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* Added option wait_timeout to mysqld. - -Sat Apr 18 14:14:23 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* Added hashing of fieldnames for tables with many fields. -* The most frequently used string functions are now in assembler (Linux-intel). - -Thu Apr 16 16:14:14 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* Added quick checking if ok host. -* Changed the interface for field->val_str() to better use stack buffers. - -Thu Apr 9 20:02:26 1998 Michael Widenius <monty@bitch.pp.sci.fi> - -* One can now reference to tables in different databases with: - table@database or database.table -* Added cacheing of users & access rights (for faster access rights checking) - -1998-04-08 Michael Widenius <monty@monty.pp.sci.fi> - -* Save of command line history to file in mysql client. - by Tommy Larsen <tommy@mix.hive.no> - -1998-04-07 Michael Widenius <monty@monty.pp.sci.fi> - -* Added time column to 'mysqladmin processes' to show how long a query - has taken or how long a thread has sleeped. - -1998-04-06 Michael Widenius <monty@monty.pp.sci.fi> - -* 'show variables' now gives the correct path for 'datadir'. -* Added logging and update_log to "show variables" - -1998-03-29 Michael Widenius <monty@analytik> - -* Added new type: YEAR. YEAR is stored on 1 byte with range 0, 1901-2155. -* Added new DATE type that is stored on 3 bytes instead of 4. All new - tables will created with the new date type if one doesn't use - --old-protocol. -* Fixed bug in record caches; One could get 'Error from table handler: #' - on some OS from some queries. - -1998-03-27 Michael Widenius <monty@monty.pp.sci.fi> - -* mysql (the command line tool) striped start space from new rows. - -1998-03-25 Michael Widenius <monty@monty.pp.sci.fi> - -* Added user level locks: GET_LOCK(string,timeout), RELEASE_LOCK(string) -* Fixed bug in range optimizer when using: - WHERE key_part_1 >= something and key_part_2 <= something_else -* Changed connect timeout to 3 seconds to make it somewhat harder - for crackers to kill mysqld trough telnet + TCP/IP. - -1998-03-24 Michael Widenius <monty@monty.pp.sci.fi> - -* new mysqld option --big-selects: - Allow big result sets by saving all temporary sets on file. - (Solves most 'table full' errors) - -1998-03-21 Michael Widenius <monty@monty.pp.sci.fi> - -* WHERE with string-column-key = constant-string didn't always find all rows - if the column had many values differing only with characters of the same sort - value (like e and é). -* Added opened_tables to 'show status'. -* Strings keys looked up with 'ref' was not compared case sensitively. -* Added flag '--big-selects' to avoid 'Table is full' errors. - Using this will slow down some queries thought. -* Added umask() to make log_files non-readable for normal users. -* Fixed some odd cases with queries that uses group functions where - the WHERE or HAVING didn't match anything. -* Ignore users with old password (8 byte) on startup if not using - --old-protocol. -* Changed name of the sql_memory allocation system and moved this to - the mysys library. - -1998-03-17 Michael Widenius <monty@monty.pp.sci.fi> - -* Added use of current_date, current_time and current_timestamp functions - without (). This automaticly made these reservered words :( - -Tue Mar 10 12:34:50 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed mysql_real_connect() to include possible db for faster connection - to a new db. -* select which matched all key fields returned the values in the same - case as the matched values instead of the found values. -* Release of 3.21.26 -* In DATE_FORMAT() PM and AM was swapped for hours 00 and 12. - -Mon Mar 9 14:15:00 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Added some tests to the table order optimizer to get some cases with - 'SELECT ... FROM many_tables' much faster. -* Added a retry loop around accept() to possible fix some problems on some - Linux machines. - -Fri Mar 6 01:18:47 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* from_days(0) now returns "0000-00-00" -* Enchanted mysql_connect protocol to allow one to specify database - on connection. This will make MySQL twice as fast to connect to a database - for new clients. - -Thu Mar 5 18:09:45 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Updated record_cache code to be aligned for more speed. -* New tests to crash-me -* Extended the default max key size to 256. - -Wed Mar 4 00:02:16 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed bug when using BLOB/TEXT in GROUP BY with many tables. - -Mon Mar 2 18:58:10 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* A enum field that is not declared NOT NULL has NULL as default value. - (Before the default value was the first enum option) - -Tue Feb 24 20:11:30 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Fixed bug in the join optimizer code when using many part keys - on the same key: INDEX (Organisation,Surname(35),Initials(35)). - -Mon Feb 23 16:15:39 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* One can now kill threads that are waiting for 'disk full'. -* Fixed some problems with UDF functions. -* ALTER TABLE + IGNORE now returns right number of affected rows. -* Fixed a bug when using 8 bytes long (alpha); filesort() didn't work. - Affects DISTINCT, ORDER BY and GROUP BY on 64 bit processors. - -Sat Feb 21 15:36:48 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed typedef string to my_string because of C++ new string class. -* now one can kill threads that's are waiting on 'disk full'. - -Fri Feb 13 23:19:23 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Release of MySQL 3.21.24 -* Fixed problem with LEFT JOIN and constant expressions in the ON part. - -Thu Feb 12 02:54:57 1998 Michael Widenius <monty@monty.pp.sci.fi> - -* Added much more descriptive error messages to mysqladmin if connect failed. -* Dynamic loadable functions. Based on source from: - Alexis Mikhailov <root@medinf.chuvashia.su> - -Thu Feb 5 15:19:14 1998 <monty@monty.pp.sci.fi> - -* One couldn't delete from a table if no one had done a select on the table. -* Fixed problem with range optimizer which many OR's on key parts inside - each other. - -Tue Feb 3 14:34:32 1998 <monty@monty.pp.sci.fi> - -* Changed default umask for new files from 0664 to 0660. - -Fri Jan 30 23:58:19 1998 <monty@monty.pp.sci.fi> - -* Release of MySQL 3.21.23 -* Changed ALTER TABLE to work with WIN32 (Win32 can't rename open files) - -Thu Jan 29 20:37:50 1998 <monty@monty.pp.sci.fi> - -* Fixed that the following symbols are not reserved words: - TIME DATE TIMESTAMP TEXT BIT ENUM NO ACTION CHECK YEAR MONTH DAY HOUR - MINUTE SECOND STATUS VARIABLES. -* Changed string handling in sql_yacc.yy and sql_lex.cc to be faster. -* Setting a TIMSTAMP to NULL in LOAD DATA INFILE... didn't set the current - time for the TIMESTAMP. -* Fixed that key conversions are tested in the WHERE clause -* LOAD DATA INFILE .... REPLACE INTO ... had wrong 'skipped' count - -Tue Jan 27 15:24:50 1998 <monty@monty.pp.sci.fi> - -* Added switch --skip-thread-prior for systems where mysqld's thread - scheduling doesn't work properly. At least BSDI 3.1 works better with - this! -* Added ODBC functions DAYNAME() and MONTHNAME(). -* Fixed unlikely(?) key optimizer bug when using ORs inside ANDs. - -Sat Jan 24 03:35:46 1998 <monty@monty.pp.sci.fi> - -* Release of 3.21.22 -* Added support of 'long constant strings' from ANSI SQL: - select 'first ' 'second'; -> 'first second'; - -Mon Jan 19 17:59:49 1998 <monty@monty.pp.sci.fi> - -* Fixed problem with Russian character set and LIKE. -* Fixed bug in ORDER BY on string formula with possible NULL values. -* Added functions DAYOFYEAR(), DAYOFMONTH(), MONTH(), YEAR(), WEEK(), - QUARTER(), HOUR(), MINUTE(), SECOND() and FIND_IN_SET(). -* Changed weighting, when using many key parts, in join optimizer to avoid - full joins for a couple of cases. - -Sun Jan 18 21:16:06 1998 <monty@monty.pp.sci.fi> - -* Removed that NULL = NULL is true. Now one must use IS NULL or IS NOT NULL - to test if a value is NULL. (This is according to ANSI SQL but may break - old applications that are ported from mSQL) - One can get the old behaviour by compiling with -DmSQL_COMPLIANT -* Fix of count(*) problems when the WHERE clause didn't match any records. -* Added function DAYOFMONTH() - -1998-01-14 Michael Widenius <monty@analytik> - -* Fixed mysqladmin.c to display only the used socket or TCP/IP port. - -Mon Jan 12 19:32:31 1998 <monty@monty.pp.sci.fi> - -* Changed SHOW FIELDS to return NULL as default value for TIMESTAMP - (This removes the DEFAULT "" entry for timestamps in mysqldump) -* Release of MySQL 3.21.21 -* Added commands SHOW STATUS and SHOW VARIABLES. -* Fixed optimizer bug when using - 'WHERE data_field=date_field2 and date_field2=constant' - -Sun Jan 11 05:07:59 1998 <monty@monty.pp.sci.fi> - -* Release of MySQL 3.21.20 -* Added long comments to MySQL /* */ -* Changed lex parsing to be a bit faster in some cases. - -Sat Jan 10 15:17:44 1998 <monty@monty.pp.sci.fi> - -* Fixed bug when using SELECT DISTINCT + NULL values. - -Fri Jan 9 16:45:26 1998 <monty@monty.pp.sci.fi> - -* Changed maximum table name and column name lengths from 32 to 64. -* Aliases can now be of 'any' length. - -Thu Jan 8 02:28:11 1998 <monty@monty.pp.sci.fi> - -* Now one gets an error if one tries to create an INDEX or UNIQUE - on a column that allows NULL values. (Before the column was silently - made NOT NULL). - -Wed Jan 7 23:19:11 1998 <monty@monty.pp.sci.fi> - -* Changed protocol (downward compatible) to mark if a column - is auto_increment or a timestamp. This is needed for the - new java driver. -* One can now in the clients check if a column is a automatic - TIMESTAMP or a AUTO_INCREMENT field. - -Sun Jan 4 20:10:21 1998 <monty@monty.pp.sci.fi> - -* Added update of big5 by jou@pdlc.ieo.nctu.edu.tw -* Added hebrew sorting order by Zeev Suraski. - -Thu Jan 1 12:57:04 1998 <monty@monty.pp.sci.fi> - -* Release of 3.21.19 -* unique key fields was not marked as unique keys in mysqlshow. -* Added function REVERSE() (by Zeev Suraski) -* Changed ni_range() to fixed a case of slow range searching. - -Wed Dec 31 15:46:25 1997 <monty@monty.pp.sci.fi> - -* Release of 3.21.18a -* Fixed problem with new filesort code from 3.21.18 on Linux - -Mon Dec 29 10:02:24 1997 <monty@monty.pp.sci.fi> - -* Added CROSS JOIN syntax. CROSS is now a reserved word -* USE database was not always written to output log. -* mysqladmin command 'status' doesn't increment 'Questions' anymore. - -Sun Dec 28 13:20:20 1997 <monty@monty.pp.sci.fi> - -* Recoded yacc/bison stack allocation to be even safer and allow MysQL - to handle even bigger expressions. - -Sat Dec 27 15:28:39 1997 <monty@monty.pp.sci.fi> - -* last_insert_id and used timestamp is now written to update log file. - timestamps, calculations with time and LAST_INSERT_ID() will now work - correctly when updating from the update log. - -Fri Dec 26 17:03:14 1997 <monty@monty.pp.sci.fi> - -* Give error message if client C functions are called in wrong order. -* Added automatic reconnect of clients for some cases. - -Mon Dec 22 00:25:34 1997 <monty@monty.pp.sci.fi> - -* Range optimizer didn't solve ranges of type: - key_part1= x AND key_part2 > y. This forced some ORDER BY queries to - do a full table scan when used with where like above. -* Small sort sets doesn't use temporary files anymore. - -Fri Dec 19 16:30:24 1997 <monty@monty.pp.sci.fi> - -* Release of MySQL 3.21.17a -* Fixed problem with compare of binary strings and blobs with ASCII - characters over 127. - -Thu Dec 18 00:33:25 1997 <monty@monty.pp.sci.fi> - -* Fixed core dump in first() when chaning some very specific AND and OR - key columns. -* Fixed lock problem: When freeing a read lock on a table with multiple - read locks, a thread waiting for write lock would have given the lock. - This shouldn't affect data integrity, but could possible make mysqld - to restart if one thread was reading data that another thread modified. -* LIMIT offset,count didn't work in INSERT ... SELECT. - -Wed Dec 17 12:35:11 1997 <monty@monty.pp.sci.fi> - -* optimized key block caching. This will be quicker than the old one when - using bigger key caches. - -Tue Dec 16 23:33:24 1997 <monty@monty.pp.sci.fi> - -* Changed bool to my_bool in some item structures to use less memory. -* Changed optimizer to use array references. This made the code 'nicer' - -Mon Dec 15 17:03:43 1997 <monty@monty.pp.sci.fi> - -* Release of Mysql 3.21.17 -* mysql: Added ouput of line number on errors when running batch. -* SELECT column,SUM(expr) now returns NULL for column when there is no - matching rows. - -Sun Dec 14 14:59:46 1997 <monty@monty.pp.sci.fi> - -* Fixed create problem with fixed length records of exactly 256 bytes. - (One couldn't insert more than 1 record in such a table). - -Fri Dec 12 18:31:32 1997 <monty@monty.pp.sci.fi> - -* Added ODBC and ANSI SQL style LEFT OUTER JOIN. - The following are new reserved words: LEFT, NATURAL, USING -* Changed use of table bits and key bits to use typedefs to make it easy - to extend join tables and keys to 64. -* The client library is now using the environment variable MYSQL_HOST as - the default host if it's defined. - -Wed Dec 10 01:29:11 1997 <monty@monty.pp.sci.fi> - -* Release of 3.21.16a -* Field type SET with 33-55 elements didn't work. -* Release of 3.21.16 -* Fixed bug in ALTER TABLE when copying from DATETIME to TIMESTAMP. - (All TIMESTAMP where set to current time). - -Tue Dec 9 14:53:15 1997 <monty@monty.pp.sci.fi> - -* Added function TIME_TO_SEC() - -Mon Dec 8 09:56:44 1997 <monty@monty.pp.sci.fi> - -* Allow empty strings as default values for BLOB and TEXT to be compatible with - mysqldump. -* Added ODBC 2.0 & 3.0 functions: POWER(), SPACE(), COT(), DEGREES(), RADIANS(), - ROUND(2 arg) and TRUNCATE(). -* Added optional (ignored) argument to CURRENT_TIME() and CURRENT_TIMESTAMP(). -* LOCATE() parameters where swapped according to ODBC standard. Fixed. -* Added detection of all ODBC 3.0 functions to crash-me -* In some cases default values was not used for NOT NULL fields. -* Timestamp wasn't updated in UPDATE SET... if the timestamp was used as - a value or in the WHERE clause. - -Sun Nov 30 04:06:31 1997 <monty@monty.pp.sci.fi> - -* Renamed version.h to mysql_version.h - -Sat Nov 29 10:50:28 1997 <monty@monty.pp.sci.fi> - -* Added dayofweek() for ODBC. -* Allow DATE '1997-01-01', TIME '12:10:10' and TIMESTAMP '1997-01-01 12:10:10' - formats required by ANSI SQL. - This has the unfortunate side-effect that one can't have columns named - DATE, TIME or TIMESTAMP anymore :( -* Changed net_write() to my_net_write() because of name conflict with sybase. -* Added --no-auto-rehash option to mysql. -* Added VARBINARY as synonym for VARCHAR BINARY - -Wed Nov 26 12:53:41 1997 <monty@monty.pp.sci.fi> - -* Added framework for multiple character sorting - -Tue Nov 25 04:03:29 1997 <monty@monty.pp.sci.fi> - -* Added extra client flag to mysql_real_connect to be compatible with - MyODBC. -* Zeev fixed bug in DATE_FORMAT: It forgot to reset the null marker. - -Mon Nov 24 20:19:18 1997 <monty@monty.pp.sci.fi> - -* Fixed problem with wrong result order when using all of - DISTINCT + JOIN + ORDER BY + LIMIT. - -Sun Nov 23 14:29:54 1997 <monty@monty.pp.sci.fi> - -* mysql: edit command now allows one to edit last query in a editor; - (patch by Zeev Suraski) -* Recoded all delete item to avoid use of stack space for deletes. - (For crash-me) -* Added command: SET SQL_LOG_OFF=1 to not log commands to standard log. - This will only affect users with process list privileges. - -Sat Nov 22 13:08:55 1997 <monty@monty.pp.sci.fi> - -* Added stack checking for crash-me :) - The following failed before: select 1+1+1+1+1+.... (687 times) - -Fri Nov 21 01:50:34 1997 <monty@monty.pp.sci.fi> - -* Added new patch for Chinese Big5 code. -* Change that blobs returns the max length for a blob instead of 8192 - to the client as field_length. - -Thu Nov 20 15:37:05 1997 <monty@monty.pp.sci.fi> - -* fixed bug in range-optimizer that crashed mysql on some queries. -* table and column name completion for mysql by - Zeev Suraski and Andi Gutmans -* Fixed problem with queries that didn't find any records: This happens only - when using multiple part keys where the first part is a number and some - other part is a char or varchar. -* Removed some wrong warning messages from range optimizer - -Wed Nov 19 16:41:14 1997 <monty@monty.pp.sci.fi> - -* Added new command REPLACE, which works like INSERT but replaces conflicting - records with the new record. REPLACE INTO TABLE ... SELECT ... works also. -* Added new commands: CREATE DATABASE db_name and DROP DATABASE db_name -* Added RENAME option to ALTER TABLE: ALTER TABLE name RENAME AS new_name - -Sun Nov 16 21:41:32 1997 <monty@monty.pp.sci.fi> - -* The thread stack was overwritten if one tried to create a table with too many - fields (more than 1000). -- Table scanning was a bit slower when using LOCK TABLE xxx WRITE. Fixed. - -Thu Nov 13 03:12:54 1997 <monty@monty.pp.sci.fi> - -* ALTER TABLE forgot BINARY attribute for strings and BLOBS -* Change comparision of strings to integer to compare as floats instead - of as integers. -* Added printing of Access denied errors to log. -* Fixed some not 100% portable typedefs in mysql_com.h -* Added Luuk de Boers defines for interval handling. - This isn't compleat yet. - -Wed Nov 12 00:28:58 1997 <monty@monty.pp.sci.fi> - -* Added automatic removal of 'ODBC function conversions': {fn now() } -* Added new function DATE_FORMAT(date_expr,format). The format string is the - same one that was previously integrated with from_unix_timestamp(). -* Changed from_unix_timestamp() to call function DATE_FORMAT() with format - element. - -Mon Nov 10 18:17:39 1997 <monty@monty.pp.sci.fi> - -* Added flag for stupid ODBC applications (like access) that wants found_rows - instead of affected_rows. -* Added basic functions for handling av ANSI INTERVAL. - -Sat Nov 8 01:20:03 1997 <monty@monty.pp.sci.fi> - -* compare with DATE and TIME with NULL didn't work. (IS NULL worked) -* Added many changes from the Win32 port. -* new function: DATE_ADD_MM(). - -Wed Nov 5 13:10:10 1997 Michael Widenius <monty@analytik> - -* SORTING on calculated DOUBLE values sorted on integer results instead. -* SELECT ... WHERE KEY=constant ORDER BY ... didn't use key to retrieve - records. This was slow because everything was sorted.. -* CHECK isn't a reserved word anymore. - -Mon Nov 3 07:55:47 1997 Michael Widenius <monty@monty.pp.sci.fi> - -* Allow start of mysqld.cc without a current database. -* Changed server version to include -debug and -log if compiled with debugging - and to show that one has a logging enabled. - -Sat Nov 1 13:08:00 1997 <monty@monty.pp.sci.fi> - -* Added missing expression 'NOT IN' -* Changed the place where HAVING should be. According to ANSI it should be - after GROUP BY but before ORDER BY. MySQL 3.20 had it wrongly last. -* Added Sybase command: USE DATABASE to start using another database. -* Fixed core dump when one had a wrong password in the password column. -* Added automatic adjusting of number of connections and table cache size - if the maximum number of files that can be opened are less than needed. - This should fix that mysqld doesn't crash even if one hasn't done a - ulimit -n 256 before starting mysqld. -* Added limit checks for create table. -* Added more checks of different errors from net_read for SCO port. - -Tue Oct 28 14:30:31 1997 <monty@monty.pp.sci.fi> - -* Fixed problem when using big table_caches; MySQL could previously only - open 256 files. - -Mon Oct 27 10:02:19 1997 <monty@monty.pp.sci.fi> - -* Added options LINE STARTING WITH to LOAD DATA INFILE and - SELECT ... into outfile. Now one can do: - - LOAD DATA INFILE '/tmp/syslog.sql' INTO TABLE uptime - FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED by "'" - LINES STARTING WITH 'VALUES (' LINES TERMINATED by ');\n' ignore 100 lines - -and - SELECT * from uptime into outfile '/tmp/syslog2.sql' - FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED by "'" - LINES STARTING WITH 'INSERT INTO uptime VALUES (' LINES TERMINATED by ');\n' - -* Added IGNORE # LINES to LOAD DATA INFILE. - -* Allow \N as a shorthand of NULL in SQL statements. - -Sun Oct 26 11:34:38 1997 <monty@monty.pp.sci.fi> - -* More memory checking. -* Fixed grouping of functions with many from tables. - -Sat Oct 25 01:46:27 1997 <monty@monty.pp.sci.fi> - -* New error message so one can check if the connection was lost while - the command was running or if the connection was down from the start. -* The mysql command tool now does a automatic reconnect if the connection - was lost when it does a query. -* new command: 'mysqladmin debug'. This forces the server to dump out some - useful information to stdout. Currently it prints all lock information. -* Rewrite lexer to be faster and more easy to extend. - -Fri Oct 24 13:57:06 1997 <monty@monty.pp.sci.fi> - -* Fixed bug when like on number key. -* Added --table option to mysql to print in table format. - Moved time and row information after query result. -* Added != as an alias for <>. - -Thu Oct 23 16:00:22 1997 <monty@monty.pp.sci.fi> - -* Added function VERSION() to make easier logs. - -Tue Oct 21 00:09:13 1997 <monty@monty.pp.sci.fi> - -* Relase of 3.21.12 -* Added memory checks to all string functions to return NULL if some - string gets bigger than max_allowed_packet. This is to make MySQL more - secure. -* Fixed core dump bug on range optimizer. -* In some cases doing a join + group + INTO OUTFILE, the result wasn't - grouped. -* Now SQL_BIG_TABLES + DISTINCT is also optimized. -* Changed the syntax of ALTER TABLE ... ALTER COLUMN ident SET DEFAULT ... - (The DEFAULT keyword wasn't allowed or required before). -* Added russian error messages. - -Mon Oct 20 04:10:53 1997 <monty@monty.pp.sci.fi> - -* LIKE with '_' as last character didn't work. Fixed -* Added many error checks for 'end of memory' -* Added ENCRYPT() function by Zeev Suraski. -* Fixed better FOREIGN KEY syntax skipping. - New reserved words: MATCH, FULL, PARTIAL - -Sun Oct 19 23:13:50 1997 <monty@monty.pp.sci.fi> - -* Force .log to logfile-name if one uses hostname as logfile. -* mysqld now allows ip and hostname to the --bind-address option. - -Sat Oct 18 22:02:36 1997 <monty@monty.pp.sci.fi> - -* Added "SET OPTION CHARACTER SET cp1251_koi8" to enable conversions off - data to/from different character sets. Currently cp1251_koi8 is the only - one, but it's now trivial to add others. - Conversions: strings in the query -> intern set - fields and items in result -> terminal set - One can get back to the old one with: - SET OPTION CHARACTER SET DEFAULT -* Lots of changes for Win95 port - -Fri Oct 17 15:29:44 1997 <monty@monty.pp.sci.fi> - -* Changed the create column syntax off NOT NULL to be after the DEFAULT value - as specified in the ANSI SQL standard. This will make mysqldump with - NOT NULL and default values incompatible with MySQL 3.20. -* New reserved words are: BOTH, FOR, LEADING and TRAILING -* Added a lot of function name alias so one can use the functions with - ODBC or ANSI SQL92 syntax. -* Fixed ALTER TABLE person ALTER COLUMN phone SET DEFAULT NULL syntax. -* Added CHAR and BIT as a synonyms for CHAR(1) -* Changed the name if the INTERVAL type to ENUM, because INTERVAL is used in - ANSI SQL. -* Added extended ANSI SQL TRIM() function. -* Added CURTIME(). - -Thu Oct 16 17:26:48 1997 <monty@monty.pp.sci.fi> - -* Fixed core dump when updating as user with only select privilige. - -Wed Oct 15 04:25:47 1997 <monty@monty.pp.sci.fi> - -* INSERT ... SELECT ... GROUP BY didn't work in some cases. On got - 'Invalid use of group function' -* When using LIMIT, SELECT now always uses keys instead of record scan. - This will give better performance on SELECT and a WHERE that matches many - rows. -* Added function last_insert_id() to retreive last auto_increment value. - This is for clients to ODBC that can't use the mysql_insert_id API function. -* Added option '--flush-logs' to mysqladmin. -* Added command 'status' to mysql. -* Moved some messages from libmysql.c to errmsg.c - -Mon Oct 13 18:38:01 1997 <monty@monty.pp.sci.fi> - -* Tested on BSDI 3.0 with the newest pthread library. -* Added new group functions: BIT_OR() and BIT_AND(). -* Added compatibility functions: CHECK, REFERENCES. -* Added BIT as a synonym for CHAR(1) to get better compatibility. -* Added option ALL to GRANT for better compatibility. (GRANT is still - a dummy fuction. -* CHECK is now a reserved word. - -Fri Oct 10 17:01:25 1997 <monty@monty.pp.sci.fi> - -* Added partly translated dutch messages. -* Fixed bug in ORDER BY and GROUP BY with NULL columns - -Thu Oct 9 10:26:47 1997 <monty@monty.pp.sci.fi> - -* Added test of create of table without columns. -* Release of 3.21.10 -* Fixed a couple of bugs in the range optimizer. Now test-select works. - -Tue Sep 30 02:40:42 1997 <monty@monty.pp.sci.fi> - -* Added new function: REPEAT(string,count). -* Added patch of support of Chinese(BIG5). -* Fixed awful slowdown of libmysql.c when configuring using '--with-debug=yes' - This affected all clients that got large results from the server. - (This didn't affect using --quick or mysql_use_result). - -Sun Sep 28 20:59:41 1997 <monty@monty.pp.sci.fi> - -* Made a new function: mysql_real_connect, that takes two extra arguments: - port and socket to use on connection. -* Added text types: TINYTEXT, TEXT, MIDDLETEXT and LONGTEXT. - These are actually blobs, but all searching is done text independent. - All old BLOB fields are now TEXT fields. -* LONG VARCHAR is a synonym for TEXT. LONG BINARY is a synonym for BLOB. -* 'LONG' is now a reserved word. - -Fri Sep 26 16:11:34 1997 <monty@monty.pp.sci.fi> - -* Release of 3.21.9 -* Fixed a couple of portable problems with include files. -* Fixed bug in range calculation that could return empty - set when searching on multiple key with only one entry (very rare). - -Wed Sep 24 15:51:37 1997 <monty@monty.pp.sci.fi> - -* Changed thread scope from PROCESS to SYSTEM. This should give better - scheduling (performance) on Solaris. -* Fixed duplicated free bug in sql_base with io_cache. - -Tue Sep 23 13:05:23 1997 <monty@monty.pp.sci.fi> - -* Allow also the old SELECT ... INTO OUTFILE syntax. -* Fixed bug with group by and select on key with many values. - -Mon Sep 22 14:54:00 1997 <monty@monty.pp.sci.fi> - -* mysql_fetch_lengths() returned sometimes wrong lengths when one used - mysql_use_result(). This affected at least some cases of mysqldump --quick. - -Sun Sep 21 20:50:07 1997 <monty@monty.pp.sci.fi> - -* Fixed memory leak bug in range optimizer. - -Sat Sep 20 00:03:51 1997 <monty@monty.pp.sci.fi> - -* Allow TIME, DATE and TIMESTAMP as column names. -* Fixed bug in optimization of WHERE const op field. - -Fri Sep 19 12:06:37 1997 <monty@monty.pp.sci.fi> - -* Fixed problem when sorting on NULL fields. -* Added handling of calculation of sum() functions. -* Added handling of trigometric functions: PI(), ACOS(), ASIN(), ATAN(), - COS(), SIN() and TAN(). -* Fixed sorting of big tables for 64 bit integers (Alpha). - -Fri Aug 29 13:06:32 1997 Michael Widenius <monty@analytik> - -* Added option --pid-file=# to mysqld -* Added date formating to from_unixtime(), originally by Zeev Suraski. - -Wed Aug 27 01:35:18 1997 <monty@monty.pp.sci.fi> - -* Fixed bug when using 'unsigned long' on Alpa. - -Tue Aug 26 03:23:28 1997 <monty@monty.pp.sci.fi> - -* Added option --bind-address to mysqld. -* Changed 'Access denied' to return username and password usage. -* Changed 'Access to database denied' to return username and database. - -Sun Aug 24 22:55:24 1997 Michael Widenius <monty@monty.pp.sci.fi> - -* Changed password crypt from 31 bits to 62 bits to make passwords more - secure. -* Changed protocol to allow for passing of mysql_errno to client. - -Fri Aug 22 18:14:00 1997 <monty@monty.pp.sci.fi> - -* Fixed bug in BETWEEN in range optimizer (Did only test = of the first - argument). - -Thu Aug 21 16:40:21 1997 <monty@monty.pp.sci.fi> - -* Version 3.21.6 -* Enabled range optimizer for update and delete. Now update and delete can - use keys again. -* Fixed bug when using unknown field in group clause. - -Tue Aug 19 00:49:13 1997 <monty@monty.pp.sci.fi> - -* The range optimizer is now enabled as default. Use msyqld --skip-new - to disable it. -* numerous small fixes to the range optimzer and a couple if fixes to - group and where handling. -* Added patch from JOERG_HENNE@Non-HP-Germany-om88.om.hp.com to allow - mit-threads to work on HPUX10. (This patch is regarded alpha) - -Fri Aug 15 02:29:21 1997 <monty@monty.pp.sci.fi> - -* Remove reverse lookup of hostnames because this takes 2 seconds - one some machines for every connection! - This can be enabled with the --secure option to mysqld. - -Thu Aug 14 22:40:15 1997 <monty@monty.pp.sci.fi> - -* remove HAVING -> WHERE optimization. To fix this one has to change - all Item_ref fields to Item_fields. -* Added patch for fast TCP/IP on FreeBSD. - -Wed Aug 13 17:14:50 1997 <monty@monty.pp.sci.fi> - -* Add optimizing of SELECT DISTINCT .... LIMIT # when there is no - GROUP or ORDER BY. -* Changed mysql to only print time information if not silent or if -vvv. -* Added polish error messages - -Sun Aug 10 11:31:10 1997 <monty@monty.pp.sci.fi> - -* new function: substring_index(), originally by Zeev Suraski. -* Added new option to mysqld: -O tmp_table_size=# -* Removed all use of PTHREAD_MUTEX_INIT and PTHREAD_COND_INIT for - porting to FreeBSD 3.0 and HPUX. - -Thu Aug 7 01:24:50 1997 <monty@monty.pp.sci.fi> - -* New function from_unixtime(timestamp) which returns a date string in - YYYY-MM-DD HH:MM:DD format. -* New function sec_to_time(seconds) which returns a string in H:MM:SS format. - -Sat Aug 2 17:18:22 1997 <monty@monty.pp.sci.fi> - -* Fixed some porting issues for OSF1 and for Alpha. - Now MySQL is know to configure on OSF1 with the Dec compiler, - after changeing one line in config.h: - #define SOCKET_SIZE_TYPE int - -Wed Jul 30 11:05:39 1997 <monty@monty.pp.sci.fi> - -* Added reverse check lookup of hostnames to get better security. -* Fixed some possible buffer overflows if one uses too long filenames. -* mysqld doesn't accept hostnames that starts with digits followed by a '.' - because the hostname may look like a IP. -* Added option --skip-networking to only allow socket connections. - (This will not work with MIT threads!) - -Tue Jul 29 10:38:55 1997 Michael Widenius <monty@monty.pp.sci.fi> - -* Removed wrong free() that killed the server on 'create/drop database'. -* Changed the name of some mysqld -O options to better names. -* Added option '-O join_cache_size=#'. -* Added option '-O max_join_size=#' to be able to set a limit how big queries - (in this case big = slow) one should be able to handle without specifying - 'SQL_OPTION OPTION_BIG_SELECTS=1'. - A # = is about 10 examined records. The default is 'unlimited'. -* When comparing a TIME, DATE, DATETIME or TIMESTAMP column to a - constant the constant is converted to a time value before comparing. - This will make it easier to get ODBC and particularly Access97 to work with - the above types. It should also make dates easier to use and the compares - should be quicker than before. -* added check of too long table names for alias. - -Mon Jul 21 16:09:47 1997 Michael Widenius <monty@monty.pp.sci.fi> - -* Applied patch from Jochen Wiedmann that fixes that query() in mysqlperl now - can take queries with \0 in it. - -Sat Jul 19 01:11:38 1997 Michael Widenius <monty@monty.pp.sci.fi> - -* Store of timestamp with 2 digit year YYMMDD didn't work. -* Fix that timestamp isn't automaticly updated if set in a update clause. -* Now the automatic timestamp field is the FIRST timestamp field. - -Thu Jul 3 13:34:26 1997 <monty@monty.pp.sci.fi> - -* Added check if database name is okey. -* Addded check if too long table names. -* SELECT * INTO OUTFILE, which didn't correctly if the outfile already existed. -* 'mysql' now shows thread id when starting or doing a reconnect. -* Changed the default sort buffer size from 2M to 1M. - -Mon Jun 30 10:18:39 1997 <monty@monty.pp.sci.fi> - -* mysqladmin: One can now do 'mysqladmin kill 5,6,7,8' -* Fixed 'Packets out of order' message. This error come sometimes when the - server was out of threads/memory. Now the correct message is retrieved by - the client. -* Added more checks with thread create for 'out of memory' errors. -* Added more checks if threads is killed to get faster kill. -* Changed the default record cache from 512K to 128K to get less problem on - systems with little memory. - -Sat Jun 28 00:18:02 1997 <monty@monty.pp.sci.fi> - -* When the max connection limit is reached, one extra connection by a user with - the PROCESS_ACL privilege is granted. - -Fri Jun 27 22:03:24 1997 <monty@monty.pp.sci.fi> - -* Added new mysqld option: -O backlog=# - -Tue Jun 24 22:08:58 1997 <monty@monty.pp.sci.fi> - -* Fixed SELECT DISTINCT when using 'hidden group'. For example: - SELECT DISTINCT MOD(some_field,10) FROM test GROUP BY some_field; -* Increased max packet size from 512K to 1024K for client. -* Removed a lot of unused functions - -Mon Jun 23 22:58:07 1997 <monty@monty.pp.sci.fi> - -* Changed key_parts to have own field for shortened keys. This gives much - nicer code in select. - -Thu Jun 19 13:09:14 1997 <monty@monty.pp.sci.fi> - -* ALTER TABLE now returns warnings from field conversions. - Changed all numerical fields to check for correct number and - increment warning counts if the value is wrong. - -Wed Jun 18 22:14:36 1997 <monty@monty.pp.sci.fi> - -* Fixed buffer overflow when retrieving big packets. - -Tue Jun 17 03:26:27 1997 <monty@monty.pp.sci.fi> - -* Port changed to 3306 (got it reserved from ISI). - -Mon Jun 16 15:46:42 1997 <monty@monty.pp.sci.fi> - -* All double are now rounded before storad as integer values. -* Fixed bug when using: SELECT WHERE A=const1 OR A=const2 OR A=const3, - and const1 = const3. In this case a key over A=const1 was wrongly used and - A=const2 wasn't used. -* Added a fix for Visual Fox Base so that any schema name from a table - specification is automaticly removed. - -Sun Jun 15 12:47:23 1997 <monty@monty.pp.sci.fi> - -* The thr_alarm array is now initialized based on number of connections -* Changed some memcpy() to bmove() to get rid of some warnings from purify. -* Changed the sql_yacc.c to drop schema name from table name. This is a crude - patch to get VFP - -Sat Jun 14 12:04:59 1997 <monty@monty.pp.sci.fi> - -* fixed missed ptr variable in filesort. -* Fixed wrong tablename and record count EXPLAIN. -* Changed the 'key use' test to prefere keys even more over full join. -* Fixed LIKE to work for binary strings. - -Fri Jun 13 13:38:14 1997 <monty@monty.pp.sci.fi> - -* New function char(num,....). - -Wed Jun 11 14:53:17 1997 <monty@monty.pp.sci.fi> - -* All field types tested with extrema values. date_time and timestamp - now require at least year, month and day on insert. - -Mon Jun 9 01:23:36 1997 <monty@monty.pp.sci.fi> - -* Added French error messages (by Therrien, Gilbert). English is still default. -* Added option '--skip-name-resolve' to get mysqld to use only IP's to - autenticate a host. 'localhost' will still be used for local UNIX sockets. -* Removed the between() function. On should use the 'col BETWEEN a AND b' - syntax instead. - -Sun Jun 8 11:05:46 1997 <monty@monty.pp.sci.fi> - -* New function ASCII. - -Sat May 31 01:00:18 1997 <monty@monty.pp.sci.fi> - -* host names are now compared case insensitive. - -Wed May 28 13:04:00 1997 <monty@monty.pp.sci.fi> - -* HAVING is added to WHERE if there is no grouping. -* MySQL now doesn't anymore have to use a extra temporary table when sorting - on functions or SUM functions. - -Tue May 27 00:54:51 1997 <monty@monty.pp.sci.fi> - -* Added function to print a item for debugging purposes. -* Fixed bug that one couldn't use 'table_name.field_name' in UPDATE. -* Removed init code with reset some of the mysqld -O variables to default after - they where set by start options. - -Thu May 22 14:52:26 1997 <monty@monty.pp.sci.fi> - -* Added varbinary syntax: 0x###### which can be used as a string (default) or a - number. - -Sun May 18 22:00:58 1997 <monty@bitch.sci.fi> - -* mysqldump: added options to lock tables and specify many tables to dump -* Add support of NULL fields in filesort -* SELECT with COUNT(),MIN() .... with no matching rows now returns 1 row. - -Sat May 17 22:06:29 1997 <monty@bitch.sci.fi> - -* New operator IN. This uses a binary search to find a match. -* Added 'SET OPTION SQL_BIG_TABLES= (0 | 1). Setting this to 1 will force - all temporary tables to disk. This will allow one to do big selects that - ordinary would give a 'table full' error. - -Fri May 16 18:53:21 1997 <monty@bitch.sci.fi> - -* New command LOCK TABLES table_name [alias] (READ | WRITE), .... - -Wed May 14 14:33:07 1997 <monty@bitch.sci.fi> - -* Renamed FIELD_TYPE_CHAR to FIELD_TYPE_TINY - -Mon May 12 09:54:24 1997 <monty@bitch.sci.fi> - -* Added command --log-update to get a update log for incremental backups. -* log file rotation for mysqld. -* log file for incremental backups -* new command: DESCRIBE SELECT .... -* Removed mysql_reload() and added mysql_refresh() instead. - Left a define to get old source to compile. - -Fri May 9 10:41:36 1997 <monty@bitch.sci.fi> - -* All functions now regards a binary type as 'sticky'. -* The time is now only requested once at start of each query. -* Splitted item_func.cc in two tables to get around that gcc uses too - much memory compiling it. -* Changed MIN() and MAX() to return the original type. -* Fixed bug in acl with anonymous user: Now if one gets accepted by the user - table as a empty user name, the user name is set to '' when checking against - the 'db' and 'host' tables. -* calculate all const expressions in the first optimizer pass. - -Tue May 6 19:16:56 1997 <monty@bitch.sci.fi> - -* Fixed ORDER BY bug when selecting on very small tables that made the - optimizer use a full join. - -Mon May 5 00:15:52 1997 <monty@bitch.sci.fi> - -* Added use of table alias in insert, delete and update. -* Removed FIELD_TYPE_TINY_BLOB, FIELD_TYPE_MEDIUM_BLOB, FIELD_TYPE_LONG_BLOB, - FIELD_TYPE_VAR_STRING from client code. -* Change syntax of SELECT .. WHERE ... INTO OUTFILE .. to the more standard - SELECT .. INTO OUTFILE 'name' WHERE ... - -Thu May 1 23:16:14 1997 <monty@bitch.sci.fi> - -* Added new API functions: - mysql_row_seek(),mysql_row_tell() and mysql_field_tell(). - mysql_field_seek() now returns old offset. -* Added expr BETWEEN expr2 AND expr3. - -Sun Apr 27 16:16:17 1997 <monty@bitch.sci.fi> - -* Changed range() detection to get queries on prefix to works faster. - Now SELECT name FROM table WHERE name="prefix" is quick even if there - are lots of rows where name starts with prefix. -* Fixed crash with shutdown and --log-isam -* Added group function STD() (standard derivation). -* mysql.cc: Fixed that NULL columns are always at least 4 wide for nicer output - of NULL values. -* Fixed that calculations that are not in GROUP BY works as expected. - (ANSI SQL extension) - Example: SELECT id,id+1 FROM table GROUP BY id - -Thu Apr 24 13:41:01 1997 Michael Widenius TcX DataKonsulter AB <monty@analytik> - -* Fixed convert bug which got mysqld to core dump with Aritmetic error on - Sparc-386 - -Wed Apr 23 12:11:05 1997 Michael Widenius TcX DataKonsulter AB <monty@analytik> - -* Added tty password to mysqlshow.c - -Tue Apr 22 15:44:11 1997 Michael Widenius TcX DataKonsulter AB <monty@analytik> - -* The test of using MYSQL_PWD was reversed. Now MYSQL_PWD is enabled as default - in the default release - -Sun Apr 20 14:36:39 1997 <monty@bitch.sci.fi> - -* Now one usually only have to give --basedir to mysqld. All other paths - are relative in a normal installation. -* BLOBs contained sometimes garbage when used with a SELECT on more than - one table and ORDER BY. -* Added option --unbuffered to mysql. (For new mysqlaccess) -* 'select *' without tables crashed server. -* When using overlapping (unnecessary keys) and join over many tables - the optimizer could get confused and return 0 records. -* Changed safe_mysqld to allow one to move installed releases. - -Sun Apr 13 10:40:50 1997 <monty@bitch.sci.fi> - -* Release 3.20.17 -* Added new function unix_timestamp([timestamp_column]) - -Sat Apr 12 11:27:57 1997 <monty@bitch.sci.fi> - -* Fixed memory over run bug when using selects with many brace levels. -* Change from_days() and weekday() to also take a full timestamp or - a datetime as argument. Before they only took a number of type YYYYMMDD or - YYMMDD. - -Wed Apr 9 13:22:24 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed stack usage to use less memory. -* All communication packages and row buffers are now alloced on demand. - The default communication buffers are now smaller than before. -* count(field) where field could have a NULL value didn't work. -* IS NULL and IS NOT NULL now work in the WHERE. -* BLOBs now work in the WHERE. -* Remove pre-space from numbers when writing decimal() coulmns to file. -* INSERT INTO ... SELECT .. WHERE could give the error 'Dupplicated field' - -Tue Apr 8 16:14:54 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added commands SET OPTION SQL_SELECT_LIMIT=# to provide framework - for options and to get some ODBC things to work. -* Fixed bug in SELECT ... two tables ... GROUP BY -* Fixed bug in INSERT ... SELECT ... GROUP BY -* Fixed bug in acl: To use FILE_PRIV one also had to have SELECT PRIV - in the user grant table. -* Fixed fatal bug in ranged querie with OR when one part of the query didn't - have any matching records. - -Mon Apr 7 16:03:00 1997 Michael Widenius <monty@bitch.sci.fi> - -* Now connections are allowed even if hostname isn't found. - In this case all hostname checks are done on IP. -* When doing insert on timestamps, the timestamp was set to the - current time even if updated by a value. -* Fixed LOAD DATA.. that if one has COLUMN TERMINATED BY to be same as - LINE TERMINATED BY, then LINE TERMINATED BY is set to a empty string. - This wasn't a bug, but a common mistake when reading columns separated - with newlines. - -Sun Apr 6 22:37:53 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed definition of function ELT as it should have been: - ELT(index,element,element,element....) now returns the index:s - element in the list. The first element has index 1. - FIELD(find,string,string,string) searches after the 'find' string - in the string list and returns a index to the found string. - The strings are compared case insensitive. -* Added some tests to safe_mysqld to make it 'safer' - -Fri Apr 4 02:17:40 1997 Michael Widenius <monty@bitch.sci.fi> - -* When sorting the db grant table, host wasn't sorted. - -Wed Apr 2 03:00:14 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed case 'WHERE key_num_column = "string"' -* LIKE was case sensitive in some places and case insensitive in other. - Now LIKE is always case insensitive. -* Fixed bug in select optimizer when using many tables with the same - column used as key to different tables. - -Sun Mar 30 21:22:39 1997 Michael Widenius <monty@bitch.sci.fi> - -* mysql.cc; Allow '#' anywhere on the line. - -Thu Mar 27 02:42:12 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added new latin2 and Russian KOI8 character tables. -* Added support for a dummy GRANT command satisfy Powerbuilder. - -Wed Mar 26 03:03:07 1997 Michael Widenius <monty@bitch.sci.fi> - -* Release of 3.20.15 -* Removed possible loop when thread waits for command from client - and fcntl() fails. Thanks to Mike Bretz for finding this bug - -Tue Mar 25 18:03:15 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed alarm loop in mysqld.cc because shutdown didn't always - succeed in Linux. -* Removed use of termbits from mysql.cc This conflicted with glibc 2.0 -* Fixed syntax error in get_password.c (for BSD). Added flush of line. -* Added test if 'linux' style gethostbyaddr_r in mysqld.cc -* Fixed bug when doing a select as superuser without a database. -* Fixed bug when doing SELECT with group calculation to outfile. - -Mon Mar 24 16:03:01 1997 Michael Widenius <monty@bitch.sci.fi> - -* Release of 3.20.14 -* Added new function SOUNDEX() -* If one gives '-p' or -password to mysql or mysqladmin without an argument, - the password will be asked from the tty. - -Sun Mar 23 00:19:42 1997 Michael Widenius <monty@bitch.sci.fi> - -* Sometimes when doing a reconnect on a down connection this succeded - first on second try. Fixed by removing handling of SIGPIPE in client. -* When adding a auto_increment key with ALTER_TABLE on got the error: - 'Can't write, duplicate key'. - -Sat Mar 22 22:55:12 1997 Michael Widenius <monty@bitch.sci.fi> - -* AVG() gave too small value on some selects with GROUP BY and ORDER BY. - -Fri Mar 21 12:27:32 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added new DATETIME type (by Giovanni Maruzzelli <maruzz@matrice.it>) -* Fixed that define 'DONT_USE_DEFAULT_FIELDS' works -* Added default password from MYSQL_PWD. (by Elmar Haneke) -* Changed C++ code to be compatible with Sun Workshop - -Thu Mar 20 12:28:06 1997 Michael Widenius TcX DataKonsulter AB <monty@analytik> - -* Changed to use a thread to handle alarms instead of signals on Solaris to - avoid race conditions. -* Fixed default length of signed numbers. (George Harvey <georgeh@pinacl.co.uk>) -* Added commando 'kill' to mysqladmin to kill a specific mysql thread. - -Wed Mar 19 12:21:33 1997 Michael Widenius TcX DataKonsulter AB <monty@analytik> - -* sql_base.cc: Allow anything for CREATE INDEX. - -Mon Mar 17 19:54:11 1997 Michael Widenius TcX DataKonsulter AB <monty@analytik> - -* Add prezeros when packing numbers to DATE, TIME and TIMESTAMP. -* Fixed the OR bug for good. - -Fri Mar 14 11:46:54 1997 Michael Widenius <monty@bitch.sci.fi> - -* Release 3.20.13 -* Added changes by bonis@kiss.de to allow WHERE const op field -* Fixed bug in mysql.c when reading long commands from batch. -* mysqldump.c - Changed newlines, return and ASCII 0 to "\n", "\r" and "\0", - to allow restoring of columns with these. - -Thu Mar 13 20:02:53 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed bug in select with and-or levels. - -Mon Mar 10 04:04:03 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added support for Slovenian characters. -* Fixed bug with limit and order by. -* Allow order and group on items that isn't in the select list. - -Sun Mar 9 00:21:36 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added ANSISQL94 DATE and TIME types. Changed TIMESTAMP fields to work better - when updateing it with a number. - -Sat Mar 8 20:19:21 1997 Michael Widenius <monty@bitch.sci.fi> - -* Allow setting of timestamp values in INSERT. -* Fixed bug with SELECT ... WHERE ... = NULL. -* Added changes for glibc 2.0 - -Fri Mar 7 07:53:01 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed bug in alter table when changeing a not null field to allow NULLs. -* Added HAVE_READDIR_R as a define which can be removed if one has - a broken readdir_r implementation (Sparc/Linux). - -Thu Mar 6 21:06:02 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added some ANS92 synonyms as field types to CREATE TABLE. - CREATE TABLE now allows FLOAT(4) and FLOAT(8) to mean FLOAT and DOUBLE. - -Wed Mar 5 00:41:29 1997 Michael Widenius <monty@bitch.sci.fi> - -* Release 3.20.11 -* Added sync of records count in sql_update. This fixed slow updates on first - connection. (Thanks to Vaclav Bittner for the test) -* Changed temporary file prefix from UN to MY. -* When using SELECT .... INTO OUTFILE all temporary tables are ISAM instead of - HEAP to allow big dumps. -* Changed date functions to be 'string functions'. This fixed some 'funny' - side effects when sorting on dates. - -Tue Mar 4 23:07:03 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed FOREIGN KEY to not create a key. Now it's only for compability. -* Extended ALTER TABLE according to SQL92. -* Some minor compability changes. -* Added --port and --socket to all utility programs and mysqld. - -Sat Feb 15 01:27:51 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added Oracle command DESCRIBE (DESC) as a synomym for some SHOW commands: - DESC table_name <==> SHOW FIELDS FROM table_name - DESC table_name column <==> SHOW FIELDS FROM table_name LIKE 'column' - DESC table_name 'column' <==> SHOW FIELDS FROM table_name LIKE 'column' - mysql.cc thought that tinyblob, mediumblob and longblob was numerical. - (Was right adjusted) - -Thu Feb 13 00:49:29 1997 Michael Widenius <monty@bitch.sci.fi> - -* mediumblob didn't work. -* Fixed safe_mysqld and make_binary_distribution to work better. -* ALTER TABLE and changeing a BLOB to a CHAR() added some garabage at - string end. - -Wed Feb 12 16:10:49 1997 Michael Widenius <monty@bitch.sci.fi> - -* new insert type: INSERT INTO ... SELECT ....; - -Tue Feb 11 12:58:36 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed some defines to get mysql to compile on freebsd 2.0 (intel) -* Removed all _A() from prototype declaration. -* Removed use of ulong in mysql.h and mysql_com.h -* Changed mysqldump to dump keynames. -* SELECT ... INTO OUTFILE 'test' create the file in the base directory - instead in database directory (if one didn't give a full path) -* A primary key is now defined as a key with name PRIMARY or the first - unique key if there doesn't exist a key with name PRIMARY. - -Mon Feb 10 00:40:48 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed leak bug when using LOAD DATA into a blob with is sometimes NULL. -* DROP TABLE can now take a list of tables. -* If a databas was crashed, in some cases a read of the wrong record - was used as a 'end of file', instead of returning an error. - -Sat Feb 8 00:16:07 1997 Michael Widenius <monty@bitch.sci.fi> - -* merged structs field_t and FIELD to FIELD. - -Fri Feb 7 12:49:01 1997 Michael Widenius <monty@bitch.sci.fi> - -* version 3.20.9 -* Alter table didn't copy null bit. This resulted that NULL fields where - always NULL. -* CREATE didn't take numbers as DEFAULT. - -Wed Feb 5 13:28:19 1997 Michael Widenius <monty@bitch.sci.fi> - -* New scripts 'add_file_priv' which add the new field 'file_priv' - to the user table. This scripts must be executed if one wants to - use the new SELECT ... INTO and LOAD DATA INFILE... commands - with a version of mysql less than 3.20.7. -* Found bug in locking code when another thread got a table opened - by another thread. This could make a thread block forever wating - for a write lock. - -Tue Feb 4 00:57:24 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed select_test.c and insert_test.c to include config.h - -Mon Feb 3 00:42:08 1997 Michael Widenius <monty@bitch.sci.fi> - -* Add an optional keyname for all key declarators. - -Sat Feb 1 19:02:43 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added command 'status' to mysqladmin for short logging. -* Increased max keys to 16 and max key parts to 15. - -Fri Jan 31 00:05:23 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added ANSI92 extended ALTER TABLE statement. -* Changed all locking code to detect ALTER table after one got a lock. - Tables are automaticly reopened if ALTERed. -* Changed some structs to classes to get better code when using CREATE TABLE. - -Thu Jan 30 01:12:13 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added new privilege to the user grant table: file_priv -* Added some compitibility changes to mysql.cc -* Added new syntax for creating keys with is a sub part of some field. -* Did a lot of changes to get around bug when comparing fields of - different lengths. Hope I didn't break something else :) -* Added long options to mysqldump. -* Added new function NOW(). - -Wed Jan 29 15:51:22 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added option -k for mysqlshow to get key info for table. -* Changed some definitions from int to uint in mysql.h to get fewer warning - with prolint. - -Mon Jan 27 02:01:29 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added sql command 'load data infile...' for export from textfiles. -* Added new API function mysql->info to pass info to client. -* Added INTO OUTFILE as option to select to get result to file. - -Fri Jan 24 14:56:19 1997 Michael Widenius <monty@bitch.sci.fi> - -* Relase 3.20.5-beta -* Got first version to work which MIT-threads. -* Added long options to mysqld -* mysqld now starts without system locking if compiled with MIT threads. -* Added new sql function RAND([init]) -* Changed sql_lex to handle \0 unquoted, but the client can't send - the query through the C api, because it takes a str pointer. - one have to use mysql_real_query() to send the query. - -Thu Jan 23 00:33:26 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added API function: mysql_get_client_info -* mysqld now uses the N_MAX_KEY_LENGTH from nisam.h as the max allowed key - length. -* The following now works: "select filter_nr,filter_nr from filter order by - filter_nr" - Before you got the error: "Column: 'filter_nr' in order clause is ambiguous" - -Wed Jan 22 14:48:58 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed fctnl flag O_NDELAY to O_NONBLOCK (Posix, and to get MIT threads - to work) - -Tue Jan 21 12:31:17 1997 Michael Widenius <monty@bitch.sci.fi> - -* mysql now outputs \0 \t \n and \\ when writing tab separated output. - when encountering ascii 0, tab, newline or \. This is to allow printing of - binary data in a portable format. - To get old behavior use -r (or --raw). -* Added long options to mysqladmin, mysql and mysqlshow. -* Added german error messages (60 of 80 error messages translated) -* Added new api function: mysql_fetch_lengths(MYSQL_RES *) which - returns a array of of column lengths (of type uint). - -Sat Jan 18 23:59:53 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed bug with IS NULL in where clause. - -Fri Jan 17 12:14:38 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed the optimizer a little to get better results when searching on a key - part. -* Added select option STRAIGHT_JOIN to tell the optimizer that it should join - tables in the given order. - -Thu Jan 16 00:55:41 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added support of comment starting with '--' in mysql.cc (Postgres syntax) -* You can now have select_expressions and table columns in a select which - are not used in the group part. This makes it efficient to implement lookups. - If the not used column is not a constant for the group the column value - is unspecified. - Example: SELECT id,lookup.text,sum(*) FROM test,lookup - WHERE test.id=lookup.id group by id; - -* Fixed bug in sum(function) (Could make core dump) -* Changed auto_increment according to SQL_SYNTAX: - INSERT into table (auto_field) values (0) inserted 0, but the SQL_SYNTAX - statied it should insert a auto_incremnt value. - -Wed Jan 15 10:42:09 1997 Michael Widenius <monty@bitch.sci.fi> - -* mysqlshow.c: Added number of records in table. Had to change the client code a - little to fix this. -* mysql now allows double '' or "" in strings for embedded ' or ". -* Changed copyright text in mysqlshow and mysqladmin. - -Mon Jan 13 02:33:09 1997 Michael Widenius <monty@bitch.sci.fi> - -* Relase 3.20.3 -* Using the new readline library from bash. -* Updated a lot of text files. -* safe_mysqld and mysql.server changed to be more compatible between the - source and the binary releases. - -Sun Jan 12 18:23:30 1997 Michael Widenius <monty@bitch.sci.fi> - -* LIMIT takes now one or two numerical arguments. - If one argument the argument indicates the maximum number of rows in a result. - If two arguments the first arguments says the offset to the first row to return, - the second is the maximum number of rows. - With this it's easy to do a poor mans next page/previous page www application. -* Changed name of SQL function FIELDS to ELT. -* Made SHOW COLUMNS a synonym for SHOW FIELDS. - Added compatibility syntax FRIEND KEY to create table. This creates in mysql - a non unique key on the given columns. -* Added CREATE INDEX and DROP INDEX as compatibility functions. In mysql - CREATE INDEX only checks if the index exists and gives an error if it doesn't - exists. DROP INDEX always succeeds. - -Sat Jan 11 00:44:29 1997 Michael Widenius <monty@bitch.sci.fi> - -* mysqladmin.c: Added client version to version info. - -Fri Jan 10 20:30:04 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed core dump bug in sql_acl (core on new connection). -* Removed host,user and db tables from database test in the distribution. -* FIELD_TYPE_CHAR can now be signed (-128 - 127) or unsigned (0 - 255) - Before it was always unsigned. - -Thu Jan 9 00:02:03 1997 Michael Widenius <monty@bitch.sci.fi> - -* Changed name from mysqllib to mysqlclient for mysql client lib. -* The following failed: concat(1,concat(2),2). - Could not call a variable argument function in a variable argument count - function. Fixed. - -Wed Jan 8 15:58:49 1997 Michael Widenius <monty@bitch.sci.fi> - -* weekday() returned wrong day 6 of 7 times. - -Mon Jan 6 23:49:31 1997 Michael Widenius <monty@bitch.sci.fi> - -* changed a lot of source to get mysqld to be compiled with SUNPRO compiler. -* sql functions must now have a '(' directly after the function name. - user '(' is now regarders as an identifier and a '(' - -Fri Jan 3 12:18:14 1997 Michael Widenius <monty@bitch.sci.fi> - -* Fixed possible bug when sorting with float and double. - Changed static sort_length to thread variable. This may have caused some - big sorts to fail when running two simultaneous sorts. -* Changed sql function INTERVALL() to INTERVAL(). - -Wed Jan 1 16:18:30 1997 Michael Widenius <monty@bitch.sci.fi> - -* Added some portability files for testing with RTS threads. -* Lot of changes for configure. - -Sun Dec 29 13:26:52 1996 Michael Widenius <monty@bitch.sci.fi> - -* Remove Makefile-linux-pl and Makefile-solaris-pl from the binary distribution. - Now only Makefile.PL is needed. - -Sat Dec 28 22:41:09 1996 Michael Widenius <monty@bitch.sci.fi> - -* Fixed that insert with a timestamp set to NULL works. (This is for a cleaner - syntax) - -Fri Dec 27 01:28:02 1996 Michael Widenius <monty@bitch.sci.fi> - -* mysqld now has english & swedish error messages. -* unireg files moved to sql directory changed to c++. - -Thu Dec 26 11:57:57 1996 Michael Widenius <monty@bitch.sci.fi> - -* mysqld: Added option 'b' for mysql basedir. All given directories is - prefixed with this if not given with hard path. - added option '-L' (language). Default is 'english/' - Moved all unireg files to sql directory. - -Fri Dec 20 11:05:37 1996 Michael Widenius TcX DataKonsulter AB <monty@ozelot> - -* Changed lex to allow a database name, table name and field name to start with - number or '_'. - -* mysqldump should now be able to dump all field types. - Changed 'show fields from table' to be fully compatible with create. -* Some bugs when parsing 'create table' fixed. (Blobs and timestamps was effected) -* Fixed one possible dead lock bug when using many tables. -* Changed a lot for configure - -Sun Dec 15 02:29:53 1996 Michael Widenius <monty@bitch.sci.fi> - -* Added new functions: INSERT(),RTRIM(),LTRIM(),FORMAT(). - -* New relase 3.19.5 -* Added functions DATABASE(),USER(),POW(),LOG10() (needed for ODBC). - -Sat Dec 14 10:10:42 1996 Michael Widenius <monty@bitch.sci.fi> - -* In a WHERE with a ORDER BY on fields from only one table the table is - now preferred as first table in a multi-join. -* HAVING and IS NULL or IS NOT NULL now works. -* a group on one column and a sort on a group function (SUM,AVG...) didn't - work together. Fixed. - -Fri Dec 13 07:20:47 1996 Michael Widenius <monty@bitch.sci.fi> - -* mysqldump: Didn't send password to server. - -* New relase 3.19.4 -* Fixed horrible locking bug when inserting in one thread and reading - on another thread. -* Fixed one-off decimal bug. 1.00 was outputed as 1.0 -* Added attribute 'Locked' to process list as info if a query is - locked by another query. -* Fixed full magic timestamp. Timestamp length may now be 14,12,10,8,6,4 or 2. - -Thu Dec 12 18:14:57 1996 Michael Widenius <monty@bitch.sci.fi> - -* sort on some number functions could be sorted wrong on last number. -* if(arg,syntax_error,syntax_error) crashed. -* added functions ceiling() and round(), exp(), log() and sqrt() -* enchanted BETWEEN to handle strings. - -Wed Dec 11 09:09:02 1996 Michael Widenius <monty@bitch.sci.fi> - -* MYODBC: Sometimes password test failed because of faulty charactermap in - windows. - -Mon Dec 9 12:50:56 1996 Michael Widenius <monty@bitch.sci.fi> - -* new relase 3.19.3 -* Fixed that select with grouping on blob's doesn't return wrong blob info. - grouping, sorting and distinct on blobs will not yet work as expected - (Probably it will group/sort by the first 7 characters in the blob) - Groping on formulas with a fixed string size (use mid on blob) should work. -* When doing a full join (no direct keys) on multiple tables with blob fields, - the blob was garbage on output. -* Fixed distinct with calculated columns. - -Sun Dec 8 19:53:24 1996 Michael Widenius <monty@bitch.sci.fi> - -* Fixed bug when allocation string for group -* new release 3.19.2 -* mysqldump.c: Didn't output ' around blobs. - -Sat Dec 7 13:00:43 1996 Michael Widenius <monty@bitch.sci.fi> - -* Added user flag to mysqldump & mysqlshow. -* ODBC: Added full support of SQLGetInfo(). Fixed limit bug (from 1.0.3). - myodbc-1.0.4 released - -Fri Dec 6 01:35:22 1996 Michael Widenius <monty@bitch.sci.fi> - -* ODBC: Added more support SetStmtOptions(). Added more debugging code - myodbc-1.0.3 released - -Tue Dec 3 22:12:30 1996 Michael Widenius <monty@bitch.sci.fi> - -* Added 'max_connections' and 'table_cache' as start variables to mysqld. -* Changed weights in join optimizer: Now prefers to use keys even more: - Before the optimizer would prefer to do a full join on small tables - (< 300 records), even if there was a usable key. - -Mon Dec 2 00:17:42 1996 Michael Widenius <monty@bitch.sci.fi> - -* new release 3.19.1 -* Fixed bug when joining tables without keys and null fields and varchars. - (mysqld hang) -* Fixed output of 'mysql show'. All fields was 'unsigned zerofill'. - -* new release 3.19.0 -* Added new column specifier AUTO_INCREMENT. -* Changed format of sql command 'show fields'. -* Changed mysqlshow to use sql command 'show fields' to get more info. -* Added synonym RLIKE for REGEXP to be compatible with mSQL - -Sun Dec 1 12:53:05 1996 Michael Widenius <monty@bitch.sci.fi> - -* item_func.cc (fix_fields): Fixed new bug when calculation and levels. - Crashed stack when optimizing where! (fatal bug in 3.18.1) - -Fri Nov 29 00:32:09 1996 Michael Widenius <monty@bitch.sci.fi> - -* Distribution 3.18.1 -* Fixed optimizeing bug. -* New ODBC version with traceing in all functions with isn't supported yet - for easier debugging. Added NO WARRANTY info. - Released as 1.0.2 - -Wed Nov 27 17:18:51 1996 Michael Widenius TcX DataKonsulter AB <monty@ozelot> - -* Added Henry Spencer's regexp in 'field REGEXP string'. Can only be used - in select_expression or HAVING until I fix the where clause. - -Mon Nov 25 20:01:05 1996 Michael Widenius TcX DataKonsulter AB <monty@ozelot> - -* Created files: CREDITS, PUBLIC. Updated FAQ, README, TODO, SQL_SYNTAX... -* Done a lot of testing on HAVING. - -Sun Nov 24 00:45:07 1996 Michael Widenius <monty@bitch.sci.fi> - -* mysql didn't stop on error in batch mode even if -f wasn't used. -* Fixed DBD Makefile.PL for linux -* Added a function.tst & function.res (test and result file of mysql functions) -* libmysql.c: Added some checking for calls after connection has gone done. -* Implemented HAVING with full expr syntax -* Changed operators '=, - -Sat Nov 23 20:52:42 1996 Michael Widenius <monty@bitch.sci.fi> - -* SQL_SYNTAX added 'like' as a boolean expression in select. -* mysqladmin.c: 'mysqladmin garbage' didn't give an error. -* sql_insert.cc: If one read a deleted record and did a insert with all fields - then the new record was marked deleted. -* perl DBI interface ported. - -Thu Nov 21 00:58:44 1996 Michael Widenius <monty@bitch.sci.fi> - -* mysql only used the TCP connection, no socket was ever created -* There was a bug in when reading from getenv(MYSQL_TCP_PORT) -* Added some more start-logging to check for port & socket. -* If something got wrong at startup some threads was kept alive in Linux -* If argument -h to mysqld is a relative path, change it to './' -* Search after the 'unireg' directory from: current dir, - mysqld program dir/.. and in env(MY_BASEDIR_VERSION) -* Added longlong support to Linux -* Added copyright notices to all files. Everything should be ready for - distribution. - -Wed Nov 20 19:03:02 1996 Michael Widenius <monty@bitch.sci.fi> - -* Added function IF. -* Added select without FROM clause (for easy test of functions) - -Tue Nov 19 11:48:55 1996 Michael Widenius <monty@bitch.sci.fi> - -* mysql.c: Sometimes 'in-string' was not initialized. -* linux distribution - -Mon Nov 18 13:47:09 1996 Michael Widenius <monty@bitch.sci.fi> - -* Fixed blob:s to work (as varchar) in ODBC (myodbc-1.0.1.zip) -* Added option -O to set buffer sizes to mysqld - -Wed Nov 13 15:21:14 1996 Michael Widenius <monty@monty.pp.sci.fi> - -* New sql functions: REPLACE, LCASE and UCASE -* hacked search on '%xxx' to work. - -Tue Nov 12 00:52:35 1996 Michael Widenius <monty@monty.pp.sci.fi> - -* mysql.cc: Fixed problems with strings containing not backslashed ' or ". - -Mon Nov 11 14:52:30 1996 Michael Widenius <monty@monty.pp.sci.fi> - -* added braces to where clause. Change where to use items. - -Wed Nov 6 00:17:37 1996 Michael Widenius <monty@analytikerna.se> - -* added PRIMARY KEY, KEY and UNIQUE to sql create. diff --git a/sql/Makefile.am b/sql/Makefile.am index c4b641f714b..b1d9149ddf4 100644 --- a/sql/Makefile.am +++ b/sql/Makefile.am @@ -97,7 +97,7 @@ DEFS = -DMYSQL_SERVER \ # Don't put lex_hash.h in BUILT_SOURCES as this will give infinite recursion BUILT_SOURCES = sql_yacc.cc sql_yacc.h EXTRA_DIST = udf_example.cc $(BUILT_SOURCES) -YFLAGS = -d +AM_YFLAGS = -d link_sources: rm -f mini_client_errors.c diff --git a/sql/des_key_file.cc b/sql/des_key_file.cc index aa74a7880db..5b25819b657 100644 --- a/sql/des_key_file.cc +++ b/sql/des_key_file.cc @@ -107,4 +107,15 @@ error: VOID(pthread_mutex_unlock(&LOCK_des_key_file)); DBUG_RETURN(result); } + + +void free_des_key_file() +{ + if (initialized) + { + initialized= 01; + pthread_mutex_destroy(&LOCK_des_key_file); + } +} + #endif /* HAVE_OPENSSL */ diff --git a/sql/ha_innodb.cc b/sql/ha_innodb.cc index e4ffeef85c3..12aa7c0b6f5 100644 --- a/sql/ha_innodb.cc +++ b/sql/ha_innodb.cc @@ -231,7 +231,7 @@ convert_error_code_to_mysql( } else if (error == (int) DB_COL_APPEARS_TWICE_IN_INDEX) { - return(HA_ERR_WRONG_TABLE_DEF); + return(HA_ERR_CRASHED); } else if (error == (int) DB_OUT_OF_FILE_SPACE) { @@ -847,6 +847,7 @@ innobase_end(void) err = innobase_shutdown_for_mysql(); hash_free(&innobase_open_tables); my_free(internal_innobase_data_file_path,MYF(MY_ALLOW_ZERO_PTR)); + pthread_mutex_destroy(&innobase_mutex); if (err != DB_SUCCESS) { @@ -1944,9 +1945,14 @@ ha_innobase::write_row( the counter here. */ skip_auto_inc_decr = FALSE; - if (error == DB_DUPLICATE_KEY && - user_thd->lex.sql_command == SQLCOM_REPLACE) - skip_auto_inc_decr= TRUE; + + if (error == DB_DUPLICATE_KEY + && (user_thd->lex.sql_command == SQLCOM_REPLACE + || user_thd->lex.sql_command + == SQLCOM_REPLACE_SELECT)) { + + skip_auto_inc_decr= TRUE; + } if (!skip_auto_inc_decr && incremented_auto_inc_counter && prebuilt->trx->auto_inc_lock) { @@ -4213,6 +4219,16 @@ ha_innobase::store_lock( lock_type = TL_WRITE_ALLOW_WRITE; } + /* In queries of type INSERT INTO t1 SELECT ... FROM t2 ... + MySQL would use the lock TL_READ_NO_INSERT on t2, and that + would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts + to t2. Convert the lock to a normal read lock to allow + concurrent inserts to t2. */ + + if (lock_type == TL_READ_NO_INSERT && !thd->in_lock_tables) { + lock_type = TL_READ; + } + lock.type=lock_type; } diff --git a/sql/ha_isam.cc b/sql/ha_isam.cc index 6fa54d18aac..7371628890f 100644 --- a/sql/ha_isam.cc +++ b/sql/ha_isam.cc @@ -35,7 +35,7 @@ *****************************************************************************/ const char **ha_isam::bas_ext() const -{ static const char *ext[]= { ".ISD",".ISM", NullS }; return ext; } +{ static const char *ext[]= { ".ISM",".ISD", NullS }; return ext; } int ha_isam::open(const char *name, int mode, uint test_if_locked) diff --git a/sql/ha_myisam.cc b/sql/ha_myisam.cc index 754d7dc8641..7cd5927bd24 100644 --- a/sql/ha_myisam.cc +++ b/sql/ha_myisam.cc @@ -125,7 +125,7 @@ void mi_check_print_warning(MI_CHECK *param, const char *fmt,...) } const char **ha_myisam::bas_ext() const -{ static const char *ext[]= { ".MYD",".MYI", NullS }; return ext; } +{ static const char *ext[]= { ".MYI",".MYD", NullS }; return ext; } const char *ha_myisam::index_type(uint key_number) @@ -510,7 +510,7 @@ int ha_myisam::repair(THD* thd, HA_CHECK_OPT *check_opt) (uint) (T_RETRY_WITHOUT_QUICK | T_QUICK))) { param.testflag&= ~T_RETRY_WITHOUT_QUICK; - sql_print_error("Warning: Retrying repair of: '%s' without quick", + sql_print_error("Note: Retrying repair of: '%s' without quick", table->path); continue; } @@ -518,7 +518,7 @@ int ha_myisam::repair(THD* thd, HA_CHECK_OPT *check_opt) if ((param.testflag & T_REP_BY_SORT)) { param.testflag= (param.testflag & ~T_REP_BY_SORT) | T_REP; - sql_print_error("Warning: Retrying repair of: '%s' with keycache", + sql_print_error("Note: Retrying repair of: '%s' with keycache", table->path); continue; } @@ -528,7 +528,7 @@ int ha_myisam::repair(THD* thd, HA_CHECK_OPT *check_opt) !(check_opt->flags & T_VERY_SILENT)) { char llbuff[22],llbuff2[22]; - sql_print_error("Warning: Found %s of %s rows when repairing '%s'", + sql_print_error("Note: Found %s of %s rows when repairing '%s'", llstr(file->state->records, llbuff), llstr(start_records, llbuff2), table->path); diff --git a/sql/ha_myisammrg.cc b/sql/ha_myisammrg.cc index 00052239f0b..5f07bbc4140 100644 --- a/sql/ha_myisammrg.cc +++ b/sql/ha_myisammrg.cc @@ -69,7 +69,7 @@ int ha_myisammrg::open(const char *name, int mode, uint test_if_locked) err: myrg_close(file); file=0; - return (my_errno= HA_ERR_WRONG_TABLE_DEF); + return (my_errno= HA_ERR_WRONG_MRG_TABLE_DEF); } int ha_myisammrg::close(void) diff --git a/sql/handler.cc b/sql/handler.cc index a36a77484e5..dcc732ba25a 100644 --- a/sql/handler.cc +++ b/sql/handler.cc @@ -679,7 +679,7 @@ void handler::print_error(int error, myf errflag) case HA_ERR_END_OF_FILE: textno=ER_KEY_NOT_FOUND; break; - case HA_ERR_WRONG_TABLE_DEF: + case HA_ERR_WRONG_MRG_TABLE_DEF: textno=ER_WRONG_MRG_TABLE; break; case HA_ERR_FOUND_DUPP_KEY: diff --git a/sql/hostname.cc b/sql/hostname.cc index 0124fa6d060..2905320cc15 100644 --- a/sql/hostname.cc +++ b/sql/hostname.cc @@ -27,7 +27,9 @@ extern "C" { // Because of SCO 3.2V4.2 #endif #if !defined( __WIN__) && !defined(OS2) +#if !defined(__NETWARE__) #include <sys/resource.h> +#endif /* __NETWARE__ */ #ifdef HAVE_SYS_UN_H #include <sys/un.h> #endif diff --git a/sql/item.h b/sql/item.h index 6f83348f0c6..8c7914cefeb 100644 --- a/sql/item.h +++ b/sql/item.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -97,6 +97,10 @@ public: virtual bool get_time(TIME *ltime); virtual bool is_null() { return 0; }; virtual void top_level_item() {} + virtual void set_result_field(Field *field) {} + virtual bool is_result_field() { return 0; } + virtual void save_in_result_field(bool no_conversions) {} + virtual void no_rows_in_result() {} virtual Item *copy_or_same(THD *thd) { return this; } virtual Item *get_tmp_table_item(THD *thd) { return copy_or_same(thd); } @@ -450,12 +454,19 @@ public: Field *tmp_table_field(TABLE *t_arg) { return result_field; } table_map used_tables() const { return 1; } virtual void fix_length_and_dec()=0; + void set_result_field(Field *field) { result_field= field; } + bool is_result_field() { return 1; } + void save_in_result_field(bool no_conversions) + { + save_in_field(result_field, no_conversions); + } }; class Item_ref :public Item_ident { public: + Field *result_field; /* Save result here */ Item **ref; Item_ref(char *db_par,char *table_name_par,char *field_name_par) :Item_ident(db_par,table_name_par,field_name_par),ref(0) {} @@ -504,6 +515,12 @@ public: enum Item_result result_type () const { return (*ref)->result_type(); } enum_field_types field_type() const { return (*ref)->field_type(); } table_map used_tables() const { return (*ref)->used_tables(); } + void set_result_field(Field *field) { result_field= field; } + bool is_result_field() { return 1; } + void save_in_result_field(bool no_conversions) + { + (*ref)->save_in_field(result_field, no_conversions); + } }; class Item_in_subselect; diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc index 59005930e31..30dad9d3f18 100644 --- a/sql/item_cmpfunc.cc +++ b/sql/item_cmpfunc.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -400,6 +400,7 @@ longlong Item_func_strcmp::val_int() return !value ? 0 : (value < 0 ? (longlong) -1 : (longlong) 1); } + void Item_func_interval::fix_length_and_dec() { if (row->cols() > 8) @@ -420,8 +421,24 @@ void Item_func_interval::fix_length_and_dec() } maybe_null= 0; max_length= 2; + used_tables_cache|= item->used_tables(); + with_sum_func= with_sum_func || item->with_sum_func; } + +void Item_func_interval::split_sum_func(List<Item> &fields) +{ + if (item->with_sum_func && item->type() != SUM_FUNC_ITEM) + item->split_sum_func(fields); + else if (item->used_tables() || item->type() == SUM_FUNC_ITEM) + { + fields.push_front(item); + item= new Item_ref((Item**) fields.head_ref(), 0, item->name); + } + Item_int_func::split_sum_func(fields); +} + + /* return -1 if null value, 0 if lower than lowest @@ -907,17 +924,47 @@ Item_func_case::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref) { used_tables_cache|=(first_expr)->used_tables(); const_item_cache&= (first_expr)->const_item(); + with_sum_func= with_sum_func || (first_expr)->with_sum_func; } if (else_expr) { used_tables_cache|=(else_expr)->used_tables(); const_item_cache&= (else_expr)->const_item(); + with_sum_func= with_sum_func || (else_expr)->with_sum_func; } if (!else_expr || else_expr->maybe_null) maybe_null=1; // The result may be NULL return 0; } + +void Item_func_case::split_sum_func(List<Item> &fields) +{ + if (first_expr) + { + if (first_expr->with_sum_func && first_expr->type() != SUM_FUNC_ITEM) + first_expr->split_sum_func(fields); + else if (first_expr->used_tables() || first_expr->type() == SUM_FUNC_ITEM) + { + fields.push_front(first_expr); + first_expr= new Item_ref((Item**) fields.head_ref(), 0, + first_expr->name); + } + } + if (else_expr) + { + if (else_expr->with_sum_func && else_expr->type() != SUM_FUNC_ITEM) + else_expr->split_sum_func(fields); + else if (else_expr->used_tables() || else_expr->type() == SUM_FUNC_ITEM) + { + fields.push_front(else_expr); + else_expr= new Item_ref((Item**) fields.head_ref(), 0, else_expr->name); + } + } + Item_func::split_sum_func(fields); +} + + void Item_func_case::set_outer_resolving() { first_expr->set_outer_resolving(); @@ -1388,9 +1435,7 @@ void Item_func_in::split_sum_func(Item **ref_pointer_array, List<Item> &fields) uint el= fields.elements; fields.push_front(item); ref_pointer_array[el]= item; - item=new Item_ref(ref_pointer_array + el, - 0, item->name); - + item= new Item_ref(ref_pointer_array + el, 0, item->name); } Item_func::split_sum_func(ref_pointer_array, fields); } diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h index 7ae60ba2fc9..6e47bbcc3d1 100644 --- a/sql/item_cmpfunc.h +++ b/sql/item_cmpfunc.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -304,6 +304,7 @@ public: args[0]->top_level_item(); return Item_func::fix_fields(thd, tlist, ref); } + void split_sum_func(List<Item> &fields); void fix_length_and_dec(); const char *func_name() const { return "if"; } }; @@ -353,6 +354,7 @@ public: const char *func_name() const { return "case"; } void print(String *str); bool fix_fields(THD *thd, struct st_table_list *tlist, Item **ref); + void split_sum_func(List<Item> &fields); Item *find_item(String *str); void set_outer_resolving(); }; diff --git a/sql/item_create.cc b/sql/item_create.cc index ab201fbfd71..610b7d77184 100644 --- a/sql/item_create.cc +++ b/sql/item_create.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -84,7 +84,7 @@ Item *create_func_connection_id(void) { THD *thd=current_thd; thd->lex.safe_to_cache_query=0; - return new Item_int("CONNECTION_ID()",(longlong) thd->thread_id,10); + return new Item_int(NullS,(longlong) thd->thread_id,10); } Item *create_func_conv(Item* a, Item *b, Item *c) @@ -157,7 +157,7 @@ Item *create_func_found_rows(void) { THD *thd=current_thd; thd->lex.safe_to_cache_query=0; - return new Item_int("FOUND_ROWS()",(longlong) thd->found_rows(),21); + return new Item_int(NullS,(longlong) thd->found_rows(),21); } Item *create_func_from_days(Item* a) @@ -295,7 +295,7 @@ Item *create_func_period_diff(Item* a, Item *b) Item *create_func_pi(void) { - return new Item_real("PI()",M_PI,6,8); + return new Item_real(NullS,M_PI,6,8); } Item *create_func_pow(Item* a, Item *b) @@ -311,7 +311,7 @@ Item *create_func_current_user() length= (uint) (strxmov(buff, thd->priv_user, "@", thd->host_or_ip, NullS) - buff); - return new Item_string("CURRENT_USER()", thd->memdup(buff, length), length, + return new Item_string(NullS, thd->memdup(buff, length), length, default_charset_info); } @@ -418,7 +418,7 @@ Item *create_func_ucase(Item* a) Item *create_func_version(void) { - return new Item_string("VERSION()",server_version, + return new Item_string(NullS,server_version, (uint) strlen(server_version), default_charset_info); } @@ -439,11 +439,6 @@ Item *create_load_file(Item* a) return new Item_load_file(a); } -Item *create_wait_for_master_pos(Item* a, Item* b) -{ - current_thd->lex.uncacheable(); - return new Item_master_pos_wait(a, b); -} Item *create_func_cast(Item *a, Item_cast cast_type) { diff --git a/sql/item_create.h b/sql/item_create.h index 97386ca9b0b..0c469e82db8 100644 --- a/sql/item_create.h +++ b/sql/item_create.h @@ -95,7 +95,6 @@ Item *create_func_ucase(Item* a); Item *create_func_version(void); Item *create_func_weekday(Item* a); Item *create_load_file(Item* a); -Item *create_wait_for_master_pos(Item* a, Item* b); Item *create_func_is_free_lock(Item* a); Item *create_func_quote(Item* a); diff --git a/sql/item_func.cc b/sql/item_func.cc index a8a9111959c..b2faae9425c 100644 --- a/sql/item_func.cc +++ b/sql/item_func.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -1069,6 +1069,17 @@ longlong Item_func_field::val_int() return 0; } +void Item_func_field::split_sum_func(List<Item> &fields) +{ + if (item->with_sum_func && item->type() != SUM_FUNC_ITEM) + item->split_sum_func(fields); + else if (item->used_tables() || item->type() == SUM_FUNC_ITEM) + { + fields.push_front(item); + item= new Item_ref((Item**) fields.head_ref(), 0, item->name); + } + Item_func::split_sum_func(fields); +} longlong Item_func_ascii::val_int() { @@ -1613,6 +1624,7 @@ void item_user_lock_init(void) void item_user_lock_free(void) { hash_free(&hash_user_locks); + pthread_mutex_destroy(&LOCK_user_locks); } void item_user_lock_release(ULL *ull) @@ -1653,11 +1665,12 @@ longlong Item_master_pos_wait::val_int() null_value = 1; return 0; } - ulong pos = (ulong)args[1]->val_int(); + longlong pos = (ulong)args[1]->val_int(); + longlong timeout = (arg_count==3) ? args[2]->val_int() : 0 ; #ifdef HAVE_REPLICATION LOCK_ACTIVE_MI; - if ((event_count = active_mi->rli.wait_for_pos(thd, log_name, pos)) == -1) - { + if ((event_count = active_mi->rli.wait_for_pos(thd, log_name, pos, timeout)) == -2) + { null_value = 1; event_count=0; } diff --git a/sql/item_func.h b/sql/item_func.h index fbf9e712092..9c5982358f8 100644 --- a/sql/item_func.h +++ b/sql/item_func.h @@ -612,6 +612,7 @@ public: return (item->fix_fields(thd, tlist, &item) || item->check_cols(1) || Item_func::fix_fields(thd, tlist, ref)); } + void split_sum_func(List<Item> &fields); void update_used_tables() { item->update_used_tables() ; Item_func::update_used_tables(); @@ -892,9 +893,10 @@ class Item_master_pos_wait :public Item_int_func String value; public: Item_master_pos_wait(Item *a,Item *b) :Item_int_func(a,b) {} + Item_master_pos_wait(Item *a,Item *b,Item *c) :Item_int_func(a,b,c) {} longlong val_int(); const char *func_name() const { return "master_pos_wait"; } - void fix_length_and_dec() { max_length=1; maybe_null=1;} + void fix_length_and_dec() { max_length=21; maybe_null=1;} }; diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc index 73f2968c5f6..037bb60de3d 100644 --- a/sql/item_strfunc.cc +++ b/sql/item_strfunc.cc @@ -597,6 +597,17 @@ null: return 0; } +void Item_func_concat_ws::split_sum_func(List<Item> &fields) +{ + if (separator->with_sum_func && separator->type() != SUM_FUNC_ITEM) + separator->split_sum_func(fields); + else if (separator->used_tables() || separator->type() == SUM_FUNC_ITEM) + { + fields.push_front(separator); + separator= new Item_ref((Item**) fields.head_ref(), 0, separator->name); + } + Item_str_func::split_sum_func(fields); +} void Item_func_concat_ws::fix_length_and_dec() { @@ -610,6 +621,7 @@ void Item_func_concat_ws::fix_length_and_dec() } used_tables_cache|=separator->used_tables(); const_item_cache&=separator->const_item(); + with_sum_func= with_sum_func || separator->with_sum_func; } void Item_func_concat_ws::update_used_tables() @@ -1571,6 +1583,19 @@ void Item_func_elt::fix_length_and_dec() } +void Item_func_elt::split_sum_func(List<Item> &fields) +{ + if (item->with_sum_func && item->type() != SUM_FUNC_ITEM) + item->split_sum_func(fields); + else if (item->used_tables() || item->type() == SUM_FUNC_ITEM) + { + fields.push_front(item); + item= new Item_ref((Item**) fields.head_ref(), 0, item->name); + } + Item_str_func::split_sum_func(fields); +} + + void Item_func_elt::update_used_tables() { Item_func::update_used_tables(); @@ -1617,6 +1642,19 @@ String *Item_func_elt::val_str(String *str) } +void Item_func_make_set::split_sum_func(List<Item> &fields) +{ + if (item->with_sum_func && item->type() != SUM_FUNC_ITEM) + item->split_sum_func(fields); + else if (item->used_tables() || item->type() == SUM_FUNC_ITEM) + { + fields.push_front(item); + item= new Item_ref((Item**) fields.head_ref(), 0, item->name); + } + Item_str_func::split_sum_func(fields); +} + + void Item_func_make_set::fix_length_and_dec() { max_length=arg_count-1; @@ -1624,6 +1662,7 @@ void Item_func_make_set::fix_length_and_dec() max_length+=args[i]->max_length; used_tables_cache|=item->used_tables(); const_item_cache&=item->const_item(); + with_sum_func= with_sum_func || item->with_sum_func; } diff --git a/sql/item_strfunc.h b/sql/item_strfunc.h index ffa01c36ed7..75ef626bbd4 100644 --- a/sql/item_strfunc.h +++ b/sql/item_strfunc.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -105,6 +105,8 @@ public: separator->check_cols(1) || Item_func::fix_fields(thd, tlist, ref)); } + void split_sum_func(List<Item> &fields); + const char *func_name() const { return "concat_ws"; } const char *func_name() const { return "concat_ws"; } void set_outer_resolving() { @@ -379,6 +381,7 @@ public: item->check_cols(1) || Item_func::fix_fields(thd, tlist, ref)); } + void split_sum_func(List<Item> &fields); void fix_length_and_dec(); void update_used_tables(); const char *func_name() const { return "elt"; } @@ -405,6 +408,7 @@ public: item->check_cols(1) || Item_func::fix_fields(thd, tlist, ref)); } + void split_sum_func(List<Item> &fields); void fix_length_and_dec(); void update_used_tables(); const char *func_name() const { return "make_set"; } diff --git a/sql/item_sum.cc b/sql/item_sum.cc index c2725ed28cf..9af3eef3cd7 100644 --- a/sql/item_sum.cc +++ b/sql/item_sum.cc @@ -1196,7 +1196,7 @@ bool Item_sum_count_distinct::add() if (always_null) return 0; copy_fields(tmp_table_param); - copy_funcs(tmp_table_param->funcs); + copy_funcs(tmp_table_param->items_to_copy); for (Field **field=table->field ; *field ; field++) if ((*field)->is_real_null(0)) diff --git a/sql/item_sum.h b/sql/item_sum.h index 69966aa5796..dc412fe1750 100644 --- a/sql/item_sum.h +++ b/sql/item_sum.h @@ -76,6 +76,7 @@ public: void make_field(Send_field *field); void print(String *str); void fix_num_length_and_dec(); + void no_rows_in_result() { reset(); } virtual bool setup(THD *thd) {return 0;} Item *get_tmp_table_item(THD *thd); }; @@ -148,6 +149,7 @@ class Item_sum_count :public Item_sum_int bool const_item() const { return !used_table_cache; } enum Sumfunctype sum_func () const { return COUNT_FUNC; } void reset(); + void no_rows_in_result() { count=0; } bool add(); void make_const(longlong count_arg) { count=count_arg; used_table_cache=0; } longlong val_int(); diff --git a/sql/lex.h b/sql/lex.h index b17d3313c3f..67b2ba85dc0 100644 --- a/sql/lex.h +++ b/sql/lex.h @@ -512,9 +512,8 @@ static SYMBOL sql_functions[] = { { "LOWER", SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_lcase)}, { "LPAD", SYM(FUNC_ARG3),0,CREATE_FUNC(create_func_lpad)}, { "LTRIM", SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ltrim)}, - { "MASTER_POS_WAIT", SYM(FUNC_ARG2),0, - CREATE_FUNC(create_wait_for_master_pos)}, { "MAKE_SET", SYM(MAKE_SET_SYM),0,0}, + { "MASTER_POS_WAIT", SYM(MASTER_POS_WAIT),0,0}, { "MAX", SYM(MAX_SYM),0,0}, { "MD5", SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_md5)}, { "MID", SYM(SUBSTRING),0,0}, /* unireg function */ diff --git a/sql/log.cc b/sql/log.cc index 9a523915673..878606f73e0 100644 --- a/sql/log.cc +++ b/sql/log.cc @@ -101,8 +101,15 @@ MYSQL_LOG::MYSQL_LOG() MYSQL_LOG::~MYSQL_LOG() { + cleanup(); +} + +void MYSQL_LOG::cleanup() +{ if (inited) { + close(1); + inited= 0; (void) pthread_mutex_destroy(&LOCK_log); (void) pthread_mutex_destroy(&LOCK_index); (void) pthread_cond_destroy(&update_cond); @@ -1081,7 +1088,7 @@ bool MYSQL_LOG::write(Log_event* event_info) if (thd->last_insert_id_used) { Intvar_log_event e(thd,(uchar) LAST_INSERT_ID_EVENT, - thd->last_insert_id); + thd->current_insert_id); e.set_log_pos(this); if (thd->server_id) e.server_id = thd->server_id; @@ -1461,6 +1468,10 @@ void MYSQL_LOG:: wait_for_update(THD* thd) at once after close, in which case we don't want to close the index file. We only write a 'stop' event to the log if exiting is set + + NOTES + One can do an open on the object at once after doing a close. + The internal structures are not freed until cleanup() is called */ void MYSQL_LOG::close(bool exiting) @@ -1602,5 +1613,51 @@ void sql_perror(const char *message) #endif } +bool flush_error_log() +{ + bool result=0; + if (opt_error_log) + { + char err_renamed[FN_REFLEN], *end; + end= strmake(err_renamed,log_error_file,FN_REFLEN-4); + strmov(end, "-old"); +#ifdef __WIN__ + char err_temp[FN_REFLEN+4]; + /* + On Windows is necessary a temporary file for to rename + the current error file. + */ + strmov(strmov(err_temp, err_renamed),"-tmp"); + (void) my_delete(err_temp, MYF(0)); + if (freopen(err_temp,"a+",stdout)) + { + freopen(err_temp,"a+",stderr); + (void) my_delete(err_renamed, MYF(0)); + my_rename(log_error_file,err_renamed,MYF(0)); + if (freopen(log_error_file,"a+",stdout)) + freopen(log_error_file,"a+",stderr); + int fd, bytes; + char buf[IO_SIZE]; + if ((fd = my_open(err_temp, O_RDONLY, MYF(0))) >= 0) + { + while ((bytes = (int) my_read(fd, (byte*) buf, IO_SIZE, MYF(0))) > 0) + my_fwrite(stderr, (byte*) buf, (uint) strlen(buf),MYF(0)); + my_close(fd, MYF(0)); + } + (void) my_delete(err_temp, MYF(0)); + } + else + result= 1; +#else + my_rename(log_error_file,err_renamed,MYF(0)); + if (freopen(log_error_file,"a+",stdout)) + freopen(log_error_file,"a+",stderr); + else + result= 1; +#endif + } + return result; +} + diff --git a/sql/my_lock.c b/sql/my_lock.c index 4d451fcff22..7f47256703a 100644 --- a/sql/my_lock.c +++ b/sql/my_lock.c @@ -14,7 +14,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ -#ifdef __EMX__ +#if defined(__EMX__) || defined(__NETWARE__) #include "../mysys/my_lock.c" #else diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h index 176283837bf..5512272d71c 100644 --- a/sql/mysql_priv.h +++ b/sql/mysql_priv.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -416,7 +416,7 @@ int mysql_union(THD *thd, LEX *lex, select_result *result, SELECT_LEX_UNIT *unit, bool tables_and_fields_initied); int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *s, TABLE_LIST *t); Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type, - Item_result_field ***copy_func, Field **from_field, + Item ***copy_func, Field **from_field, bool group,bool modify_item); int mysql_create_table(THD *thd,const char *db, const char *table_name, HA_CREATE_INFO *create_info, @@ -500,6 +500,7 @@ extern struct st_des_keyschedule des_keyschedule[10]; extern uint des_default_key; extern pthread_mutex_t LOCK_des_key_file; bool load_des_key_file(const char *file_name); +void free_des_key_file(); #endif /* HAVE_OPENSSL */ /* sql_do.cc */ @@ -551,6 +552,7 @@ my_bool mysqld_show_warnings(THD *thd, ulong levels_to_show); /* sql_handler.cc */ int mysql_ha_open(THD *thd, TABLE_LIST *tables); int mysql_ha_close(THD *thd, TABLE_LIST *tables, bool dont_send_ok=0); +int mysql_ha_closeall(THD *thd, TABLE_LIST *tables, bool dont_send_ok=0); int mysql_ha_read(THD *, TABLE_LIST *,enum enum_ha_read_modes,char *, List<Item> *,enum ha_rkey_function,Item *,ha_rows,ha_rows); @@ -680,6 +682,7 @@ extern uchar *days_in_month; extern char language[LIBLEN],reg_ext[FN_EXTLEN]; extern char glob_hostname[FN_REFLEN], mysql_home[FN_REFLEN]; extern char pidfile_name[FN_REFLEN], time_zone[30], *opt_init_file; +extern char log_error_file[FN_REFLEN]; extern char blob_newline; extern double log_10[32]; extern ulonglong keybuff_size; @@ -717,7 +720,7 @@ extern uint delay_key_write_options; extern bool opt_endinfo, using_udf_functions, locked_in_memory; extern bool opt_using_transactions, mysql_embedded; extern bool using_update_log, opt_large_files; -extern bool opt_log, opt_update_log, opt_bin_log, opt_slow_log; +extern bool opt_log, opt_update_log, opt_bin_log, opt_slow_log, opt_error_log; extern bool opt_disable_networking, opt_skip_show_db; extern bool volatile abort_loop, shutdown_in_progress, grant_option; extern uint volatile thread_count, thread_running, global_read_lock; @@ -760,6 +763,7 @@ extern struct rand_struct sql_rand; extern SHOW_COMP_OPTION have_isam, have_innodb, have_berkeley_db; extern SHOW_COMP_OPTION have_raid, have_openssl, have_symlink; extern SHOW_COMP_OPTION have_query_cache, have_berkeley_db, have_innodb; +extern SHOW_COMP_OPTION have_crypt; #ifndef __WIN__ extern pthread_t signal_thread; @@ -846,7 +850,7 @@ int create_frm(char *name,uint reclength,uchar *fileinfo, HA_CREATE_INFO *create_info, uint keys); void update_create_info_from_table(HA_CREATE_INFO *info, TABLE *form); int rename_file_ext(const char * from,const char * to,const char * ext); -bool check_db_name(const char *db); +bool check_db_name(char *db); bool check_column_name(const char *name); bool check_table_name(const char *name, uint length); char *get_field(MEM_ROOT *mem,TABLE *table,uint fieldnr); @@ -871,6 +875,8 @@ extern int sql_cache_hit(THD *thd, char *inBuf, uint length); Item *get_system_var(enum_var_type var_type, LEX_STRING name); Item *get_system_var(enum_var_type var_type, const char *var_name, uint length, const char *item_name); +/* log.cc */ +bool flush_error_log(void); /* Some inline functions for more speed */ diff --git a/sql/mysqld.cc b/sql/mysqld.cc index 0899a342abb..08c5889257b 100644 --- a/sql/mysqld.cc +++ b/sql/mysqld.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -80,7 +80,9 @@ extern "C" { // Because of SCO 3.2V4.2 #if defined(OS2) # include <sys/un.h> #elif !defined( __WIN__) +# ifndef __NETWARE__ #include <sys/resource.h> +# endif /* __NETWARE__ */ #ifdef HAVE_SYS_UN_H # include <sys/un.h> #endif @@ -118,6 +120,15 @@ int deny_severity = LOG_WARNING; #include <sys/mman.h> #endif +#ifdef __NETWARE__ +#include <nks/vm.h> +#include <library.h> +#include <monitor.h> + +event_handle_t eh; +Report_t ref; +#endif /* __NETWARE__ */ + #ifdef _AIX41 int initgroups(const char *,unsigned int); #endif @@ -186,7 +197,7 @@ static bool opt_enable_named_pipe = 0; #ifdef __WIN__ static pthread_cond_t COND_handler_count; static uint handler_count; -static bool opt_console=0, start_mode=0, use_opt_args; +static bool start_mode=0, use_opt_args; static int opt_argc; static char **opt_argv; #endif @@ -242,6 +253,11 @@ SHOW_COMP_OPTION have_query_cache=SHOW_OPTION_YES; #else SHOW_COMP_OPTION have_query_cache=SHOW_OPTION_NO; #endif +#ifdef HAVE_CRYPT +SHOW_COMP_OPTION have_crypt=SHOW_OPTION_YES; +#else +SHOW_COMP_OPTION have_crypt=SHOW_OPTION_NO; +#endif const char *show_comp_option_name[]= {"YES", "NO", "DISABLED"}; @@ -266,7 +282,9 @@ my_bool opt_reckless_slave = 0; ulong back_log, connect_timeout, concurrency; char mysql_home[FN_REFLEN], pidfile_name[FN_REFLEN], time_zone[30]; +char log_error_file[FN_REFLEN]; bool opt_log, opt_update_log, opt_bin_log, opt_slow_log; +bool opt_error_log= IF_WIN(1,0); bool opt_disable_networking=0, opt_skip_show_db=0; my_bool opt_enable_named_pipe= 0; my_bool opt_local_infile, opt_external_locking, opt_slave_compressed_protocol; @@ -282,12 +300,14 @@ static my_string opt_logname=0,opt_update_logname=0, static char* mysql_home_ptr= mysql_home; static char* pidfile_name_ptr= pidfile_name; +char* log_error_file_ptr= log_error_file; static pthread_t select_thread; static my_bool opt_noacl=0, opt_bootstrap=0, opt_myisam_log=0; my_bool opt_safe_user_create = 0, opt_no_mix_types = 0; my_bool lower_case_table_names, opt_old_rpl_compat; my_bool opt_show_slave_auth_info, opt_sql_bin_update = 0; my_bool opt_log_slave_updates= 0, opt_old_passwords=0, use_old_passwords=0; +my_bool opt_console= 0; volatile bool mqh_used = 0; FILE *bootstrap_file=0; @@ -374,8 +394,8 @@ ulong bytes_sent = 0L, bytes_received = 0L; bool opt_endinfo,using_udf_functions, locked_in_memory; bool opt_using_transactions, using_update_log; -bool volatile abort_loop,select_thread_in_use,grant_option; -bool volatile ready_to_exit,shutdown_in_progress; +bool volatile abort_loop, select_thread_in_use, signal_thread_in_use; +bool volatile ready_to_exit, shutdown_in_progress, grant_option; ulong refresh_version=1L,flush_version=1L; /* Increments on each reload */ ulong query_id=1L,long_query_count,aborted_threads, aborted_connects,delayed_insert_timeout,delayed_insert_limit, @@ -491,6 +511,7 @@ static uint set_maximum_open_files(uint max_file_limit); #endif static ulong find_bit_type(const char *x, TYPELIB *bit_lib); static void clean_up(bool print_message); +static void clean_up_mutexes(void); #ifndef EMBEDDED_LIBRARY /**************************************************************************** @@ -519,7 +540,7 @@ static void close_connections(void) (void) pthread_mutex_unlock(&LOCK_manager); /* kill connection thread */ -#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) +#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) && !defined(__NETWARE__) DBUG_PRINT("quit",("waiting for select thread: %lx",select_thread)); (void) pthread_mutex_lock(&LOCK_thread_count); @@ -661,10 +682,6 @@ static void close_connections(void) } (void) pthread_mutex_unlock(&LOCK_thread_count); - mysql_log.close(1); - mysql_slow_log.close(1); - mysql_update_log.close(1); - mysql_bin_log.close(1); DBUG_PRINT("quit",("close_connections thread")); DBUG_VOID_RETURN; } @@ -682,10 +699,10 @@ static void close_server_sock() ip_sock=INVALID_SOCKET; DBUG_PRINT("info",("calling shutdown on TCP/IP socket")); VOID(shutdown(tmp_sock,2)); -#ifdef NOT_USED +#if defined(__NETWARE__) /* - The following code is disabled as it causes MySQL to hang on - AIX 4.3 during shutdown + The following code is disabled for normal systems as it causes MySQL + to hang on AIX 4.3 during shutdown */ DBUG_PRINT("info",("calling closesocket on TCP/IP socket")); VOID(closesocket(tmp_sock)); @@ -697,9 +714,9 @@ static void close_server_sock() unix_sock=INVALID_SOCKET; DBUG_PRINT("info",("calling shutdown on unix socket")); VOID(shutdown(tmp_sock,2)); -#ifdef NOT_USED +#if defined(__NETWARE__) /* - The following code is disabled as it may cause MySQL to hang on + The following code is disabled for normal systems as it causes MySQL AIX 4.3 during shutdown (not tested, but likely) */ DBUG_PRINT("info",("calling closesocket on unix/IP socket")); @@ -763,7 +780,7 @@ void kill_mysql(void) /* Force server down. kill all connections and threads and exit */ -#if defined(OS2) +#if defined(OS2) || defined(__NETWARE__) extern "C" void kill_server(int sig_ptr) #define RETURN_FROM_KILL_SERVER DBUG_RETURN #elif !defined(__WIN__) @@ -782,13 +799,16 @@ static void __cdecl kill_server(int sig_ptr) RETURN_FROM_KILL_SERVER; kill_in_progress=TRUE; abort_loop=1; // This should be set +#ifdef __NETWARE__ + ActivateScreen(getscreenhandle()); // Show the screen going down +#endif signal(sig,SIG_IGN); if (sig == MYSQL_KILL_SIGNAL || sig == 0) sql_print_error(ER(ER_NORMAL_SHUTDOWN),my_progname); else sql_print_error(ER(ER_GOT_SIGNAL),my_progname,sig); /* purecov: inspected */ -#if defined(USE_ONE_SIGNAL_HAND) && !defined(__WIN__) && !defined(OS2) +#if defined(__NETWARE__) || (defined(USE_ONE_SIGNAL_HAND) && !defined(__WIN__) && !defined(OS2)) my_thread_init(); // If this is a new thread #endif close_connections(); @@ -796,13 +816,19 @@ static void __cdecl kill_server(int sig_ptr) unireg_abort(1); /* purecov: inspected */ else unireg_end(); +#ifdef __NETWARE__ + pthread_join(select_thread, NULL); // wait for main thread +#else pthread_exit(0); /* purecov: deadcode */ +#endif /* __NETWARE__ */ + +pthread_exit(0); /* purecov: deadcode */ #endif /* EMBEDDED_LIBRARY */ RETURN_FROM_KILL_SERVER; } -#ifdef USE_ONE_SIGNAL_HAND +#if defined(USE_ONE_SIGNAL_HAND) || (defined(__NETWARE__) && defined(SIGNALS_DONT_BREAK_READ)) extern "C" pthread_handler_decl(kill_server_thread,arg __attribute__((unused))) { SHUTDOWN_THD; @@ -829,7 +855,7 @@ extern "C" sig_handler print_signal_warning(int sig) #ifdef DONT_REMEMBER_SIGNAL sigset(sig,print_signal_warning); /* int. thread system calls */ #endif -#if !defined(__WIN__) && !defined(OS2) +#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) if (sig == SIGALRM) alarm(2); /* reschedule alarm */ #endif @@ -853,11 +879,13 @@ void unireg_end(void) { clean_up(1); my_thread_end(); +#ifndef __NETWARE__ #ifdef SIGNALS_DONT_BREAK_READ exit(0); #else pthread_exit(0); // Exit is in main thread #endif +#endif /* __NETWARE__ */ } @@ -869,6 +897,8 @@ extern "C" void unireg_abort(int exit_code) clean_up(1); /* purecov: inspected */ DBUG_PRINT("quit",("done with cleanup in unireg_abort")); my_thread_end(); + clean_up_mutexes(); + my_end(opt_endinfo ? MY_CHECK_ERROR | MY_GIVE_INFO : 0); exit(exit_code); /* purecov: inspected */ } @@ -878,6 +908,12 @@ void clean_up(bool print_message) DBUG_PRINT("exit",("clean_up")); if (cleanup_done++) return; /* purecov: inspected */ + + mysql_log.cleanup(); + mysql_slow_log.cleanup(); + mysql_update_log.cleanup(); + mysql_bin_log.cleanup(); + #ifdef HAVE_REPLICATION if (use_slave_mask) bitmap_free(&slave_error_mask); @@ -913,6 +949,9 @@ void clean_up(bool print_message) #ifdef HAVE_REPLICATION end_slave_list(); #endif +#ifdef HAVE_OPENSSL + free_des_key_file(); +#endif /* HAVE_OPENSSL */ #ifdef USE_REGEX regex_end(); #endif @@ -940,6 +979,35 @@ void clean_up(bool print_message) } /* clean_up */ +static void clean_up_mutexes() +{ + (void) pthread_mutex_destroy(&LOCK_mysql_create_db); + (void) pthread_mutex_destroy(&LOCK_Acl); + (void) pthread_mutex_destroy(&LOCK_grant); + (void) pthread_mutex_destroy(&LOCK_open); + (void) pthread_mutex_destroy(&LOCK_thread_count); + (void) pthread_mutex_destroy(&LOCK_mapped_file); + (void) pthread_mutex_destroy(&LOCK_status); + (void) pthread_mutex_destroy(&LOCK_error_log); + (void) pthread_mutex_destroy(&LOCK_delayed_insert); + (void) pthread_mutex_destroy(&LOCK_delayed_status); + (void) pthread_mutex_destroy(&LOCK_delayed_create); + (void) pthread_mutex_destroy(&LOCK_manager); + (void) pthread_mutex_destroy(&LOCK_crypt); + (void) pthread_mutex_destroy(&LOCK_bytes_sent); + (void) pthread_mutex_destroy(&LOCK_bytes_received); + (void) pthread_mutex_destroy(&LOCK_timezone); + (void) pthread_mutex_destroy(&LOCK_user_conn); + (void) pthread_mutex_destroy(&LOCK_rpl_status); + (void) pthread_mutex_destroy(&LOCK_active_mi); + (void) pthread_mutex_destroy(&LOCK_global_system_variables); + (void) pthread_cond_destroy(&COND_thread_count); + (void) pthread_cond_destroy(&COND_refresh); + (void) pthread_cond_destroy(&COND_thread_cache); + (void) pthread_cond_destroy(&COND_flush_thread_cache); + (void) pthread_cond_destroy(&COND_manager); + (void) pthread_cond_destroy(&COND_rpl_status); +} /**************************************************************************** ** Init IP and UNIX socket @@ -973,7 +1041,7 @@ static void set_ports() static void set_user(const char *user) { -#if !defined(__WIN__) && !defined(OS2) +#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) struct passwd *ent; // don't bother if we aren't superuser @@ -1034,7 +1102,7 @@ static void set_user(const char *user) static void set_root(const char *path) { -#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) +#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2) && !defined(__NETWARE__) if (chroot(path) == -1) { sql_perror("chroot"); @@ -1347,7 +1415,92 @@ static void init_signals(void) } static void start_signal_handler(void) +{} + +static void check_data_home(const char *path) +{} + +#elif defined(__NETWARE__) + +// down server event callback +void mysql_down_server_cb(void *, void *) +{ + setscreenmode(SCR_AUTOCLOSE_ON_EXIT); // auto close the screen + kill_server(0); +} + +// destroy callback resources +void mysql_cb_destroy(void *) +{ + UnRegisterEventNotification(eh); // cleanup down event notification + NX_UNWRAP_INTERFACE(ref); +} + +// initialize callbacks +void mysql_cb_init() +{ + // register for down server event + void *handle = getnlmhandle(); + rtag_t rt = AllocateResourceTag(handle, "MySQL Down Server Callback", + EventSignature); + NX_WRAP_INTERFACE((void *)mysql_down_server_cb, 2, (void **)&ref); + eh = RegisterForEventNotification(rt, EVENT_DOWN_SERVER, + EVENT_PRIORITY_APPLICATION, + NULL, ref, NULL); + NXVmRegisterExitHandler(mysql_cb_destroy, NULL); // clean-up +} + +static void init_signals(void) +{ + int signals[] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGABRT}; + + for (uint i=0 ; i < sizeof(signals)/sizeof(int) ; i++) + signal(signals[i], kill_server); + mysql_cb_init(); // initialize callbacks +} + +static void start_signal_handler(void) +{ + // Save vm id of this process + if (!opt_bootstrap) + { + File pidFile; + if ((pidFile = my_create(pidfile_name,0664, O_WRONLY, MYF(MY_WME))) >= 0) + { + char buff[21]; + sprintf(buff,"%lu",(ulong) getpid()); + (void) my_write(pidFile, buff,strlen(buff),MYF(MY_WME)); + (void) my_close(pidFile,MYF(0)); + } + } + // no signal handler +} + + +/* Warn if the data is on a Traditional volume */ + +static void check_data_home(const char *path) { + struct volume_info vol; + char buff[PATH_MAX], *pos; + + bzero((char*) &vol, sizeof(vol)); // clear struct + + // find volume name + if ((pos= strchr(path, ':'))) + { + uint length= (uint) (pos-path); + strmake(buff, path, min(length, sizeof(buff)-1)); + } + else + strmov(buff, "SYS"); // assume SYS volume + + netware_vol_info_from_name(&vol, buff); // retrieve information + if ((vol.flags & VOL_NSS_PRESENT) == 0) + { + sql_print_error("Error: %s is not on an NSS volume!", path); + unireg_abort(-1); + } } #elif defined(__EMX__) @@ -1382,8 +1535,10 @@ static void init_signals(void) } static void start_signal_handler(void) -{ -} +{} + +static void check_data_home(const char *path) +{} #else /* if ! __WIN__ && ! __EMX__ */ @@ -1587,7 +1742,8 @@ extern "C" void *signal_hand(void *arg __attribute__((unused))) int sig; my_thread_init(); // Init new thread DBUG_ENTER("signal_hand"); - SIGNAL_THD; + signal_thread_in_use= 1; + /* Setup alarm handler The two extra handlers are for slave threads @@ -1654,6 +1810,7 @@ extern "C" void *signal_hand(void *arg __attribute__((unused))) if (cleanup_done) { my_thread_end(); + signal_thread_in_use= 0; pthread_exit(0); // Safety } switch (sig) { @@ -1705,6 +1862,9 @@ extern "C" void *signal_hand(void *arg __attribute__((unused))) return(0); /* purecov: deadcode */ } +static void check_data_home(const char *path) +{} + #endif /* __WIN__*/ @@ -1856,6 +2016,12 @@ static int init_common_variables(const char *conf_file_name, int argc, max_system_variables.pseudo_thread_id= (ulong)~0; start_time=time((time_t*) 0); + +#ifdef __NETWARE__ + printf("MySQL Server %s, for %s (%s)\n", VERSION, SYSTEM_TYPE, MACHINE_TYPE); + fflush(stdout); +#endif /* __NETWARE__ */ + #ifdef OS2 { // fix timezone for daylight saving @@ -2038,10 +2204,26 @@ static int init_server_components() using_update_log=1; } + if (opt_error_log) + { + if (!log_error_file_ptr[0]) + fn_format(log_error_file, glob_hostname, mysql_data_home, ".err", 0); + else + fn_format(log_error_file, log_error_file_ptr, mysql_data_home, ".err", + MY_UNPACK_FILENAME | MY_SAFE_PATH); + if (!log_error_file[0]) + opt_error_log= 1; // Too long file name + else + { + if (freopen(log_error_file, "a+", stdout)) + freopen(log_error_file, "a+", stderr); + } + } + if (ha_init()) { sql_print_error("Can't init databases"); - return 1; + unireg_abort(1); } if (opt_myisam_log) (void) mi_log(1); @@ -2061,7 +2243,7 @@ static int init_server_components() locked_in_memory=0; #endif - ft_init_stopwords(ft_precompiled_stopwords); + ft_init_stopwords(); init_max_user_conn(); init_update_queries(); @@ -2208,6 +2390,7 @@ int main(int argc, char **argv) /* We have enough space for fiddling with the argv, continue */ + check_data_home(mysql_real_data_home); if (my_setwd(mysql_real_data_home,MYF(MY_WME))) { unireg_abort(1); /* purecov: inspected */ @@ -2260,7 +2443,9 @@ The server will not act as a slave."); { abort_loop=1; select_thread_in_use=0; - (void) pthread_kill(signal_thread,MYSQL_KILL_SIGNAL); +#ifndef __NETWARE__ + (void) pthread_kill(signal_thread, MYSQL_KILL_SIGNAL); +#endif /* __NETWARE__ */ #ifndef __WIN__ if (!opt_bootstrap) (void) my_delete(pidfile_name,MYF(MY_WME)); // Not needed anymore @@ -2297,7 +2482,9 @@ The server will not act as a slave."); create_shutdown_thread(); create_maintenance_thread(); - printf(ER(ER_READY),my_progname,server_version,""); + printf(ER(ER_READY),my_progname,server_version, + ((unix_sock == INVALID_SOCKET) ? (char*) "" : mysql_unix_port), + mysql_port); fflush(stdout); #if defined(__NT__) || defined(HAVE_SMEM) @@ -2340,6 +2527,22 @@ The server will not act as a slave."); CloseHandle(hEventShutdown); } #endif +#ifndef __NETWARE__ + { + uint i; + /* + Wait up to 10 seconds for signal thread to die. We use this mainly to + avoid getting warnings that my_thread_end has not been called + */ + for (i= 0 ; i < 100 && signal_thread_in_use; i++) + { + if (pthread_kill(signal_thread, MYSQL_KILL_SIGNAL)) + break; + my_sleep(100); // Give it time to die + } + } +#endif + clean_up_mutexes(); my_end(opt_endinfo ? MY_CHECK_ERROR | MY_GIVE_INFO : 0); exit(0); return(0); /* purecov: deadcode */ @@ -2626,7 +2829,10 @@ static void create_new_thread(THD *thd) inline void kill_broken_server() { /* hack to get around signals ignored in syscalls for problem OS's */ - if (unix_sock == INVALID_SOCKET || + if ( +#if !defined(__NETWARE__) + unix_sock == INVALID_SOCKET || +#endif (!opt_disable_networking && ip_sock == INVALID_SOCKET)) { select_thread_in_use = 0; @@ -2728,6 +2934,13 @@ extern "C" pthread_handler_decl(handle_connections_sockets, size_socket length=sizeof(struct sockaddr_in); new_sock = accept(sock, my_reinterpret_cast(struct sockaddr *) (&cAddr), &length); +#ifdef __NETWARE__ + // TODO: temporary fix, waiting for TCP/IP fix - DEFECT000303149 + if ((new_sock == INVALID_SOCKET) && (socket_errno == EINVAL)) + { + kill_server(SIGTERM); + } +#endif if (new_sock != INVALID_SOCKET || (socket_errno != SOCKET_EINTR && socket_errno != SOCKET_EAGAIN)) break; @@ -3222,7 +3435,7 @@ enum options OPT_CONNECT_TIMEOUT, OPT_DELAYED_INSERT_TIMEOUT, OPT_DELAYED_INSERT_LIMIT, OPT_DELAYED_QUEUE_SIZE, OPT_FLUSH_TIME, OPT_FT_MIN_WORD_LEN, - OPT_FT_MAX_WORD_LEN, OPT_FT_MAX_WORD_LEN_FOR_SORT, + OPT_FT_MAX_WORD_LEN, OPT_FT_MAX_WORD_LEN_FOR_SORT, OPT_FT_STOPWORD_FILE, OPT_INTERACTIVE_TIMEOUT, OPT_JOIN_BUFF_SIZE, OPT_KEY_BUFFER_SIZE, OPT_LONG_QUERY_TIME, OPT_LOWER_CASE_TABLE_NAMES, OPT_MAX_ALLOWED_PACKET, @@ -3260,6 +3473,8 @@ enum options OPT_BDB_CACHE_SIZE, OPT_BDB_LOG_BUFFER_SIZE, OPT_BDB_MAX_LOCK, + OPT_ERROR_LOG_FILE, + OPT_AUTOCLOSE, OPT_ENABLE_SHARED_MEMORY, OPT_SHARED_MEMORY_BASE_NAME, OPT_OLD_PASSWORDS @@ -3272,6 +3487,9 @@ struct my_option my_long_options[] = { {"ansi", 'a', "Use ANSI SQL syntax instead of MySQL syntax", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, +#ifdef __NETWARE__ + {"autoclose", OPT_AUTOCLOSE, "Auto close screen. (NetWare only)", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, +#endif /* __NETWARE__ */ {"basedir", 'b', "Path to installation directory. All paths are usually resolved relative to this.", (gptr*) &mysql_home_ptr, (gptr*) &mysql_home_ptr, 0, GET_STR, REQUIRED_ARG, @@ -3313,10 +3531,10 @@ struct my_option my_long_options[] = REQUIRED_ARG, 0, 0, 0, 0, 0, 0}, {"bootstrap", OPT_BOOTSTRAP, "Used by mysql installation scripts", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, -#ifdef __WIN__ - {"console", OPT_CONSOLE, "Don't remove the console window", + {"console", OPT_CONSOLE, "Write error output on screen; Don't remove the console window on windows", (gptr*) &opt_console, (gptr*) &opt_console, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0}, +#ifdef __WIN__ {"standalone", OPT_STANDALONE, "Dummy option to start as a standalone program (NT)", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, @@ -3558,6 +3776,9 @@ struct my_option my_long_options[] = {"pid-file", OPT_PID_FILE, "Pid file used by safe_mysqld", (gptr*) &pidfile_name_ptr, (gptr*) &pidfile_name_ptr, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0}, + {"log-error", OPT_ERROR_LOG_FILE, "Log error file", + (gptr*) &log_error_file_ptr, (gptr*) &log_error_file_ptr, 0, GET_STR, + OPT_ARG, 0, 0, 0, 0, 0, 0}, {"port", 'P', "Port number to use for connection.", (gptr*) &mysql_port, (gptr*) &mysql_port, 0, GET_UINT, REQUIRED_ARG, 0, 0, 0, 0, 0, 0}, {"reckless-slave", OPT_RECKLESS_SLAVE, "For debugging", 0, 0, 0, GET_NO_ARG, @@ -3737,7 +3958,8 @@ struct my_option my_long_options[] = (gptr*) &max_system_variables.log_warnings, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0}, { "back_log", OPT_BACK_LOG, - "The number of outstanding connection requests MySQL can have. This comes into play when the main MySQL thread gets very many connection requests in a very short time.", (gptr*) &back_log, (gptr*) &back_log, 0, GET_ULONG, + "The number of outstanding connection requests MySQL can have. This comes into play when the main MySQL thread gets very many connection requests in a very short time.", + (gptr*) &back_log, (gptr*) &back_log, 0, GET_ULONG, REQUIRED_ARG, 50, 1, 65535, 0, 1, 0 }, #ifdef HAVE_BERKELEY_DB { "bdb_cache_size", OPT_BDB_CACHE_SIZE, @@ -3790,9 +4012,13 @@ struct my_option my_long_options[] = (gptr*) &ft_max_word_len, (gptr*) &ft_max_word_len, 0, GET_ULONG, REQUIRED_ARG, HA_FT_MAXLEN, 10, HA_FT_MAXLEN, 0, 1, 0}, { "ft_max_word_len_for_sort", OPT_FT_MAX_WORD_LEN_FOR_SORT, - "Undocumented", (gptr*) &ft_max_word_len_for_sort, - (gptr*) &ft_max_word_len_for_sort, 0, GET_ULONG, REQUIRED_ARG, 20, 4, - HA_FT_MAXLEN, 0, 1, 0}, + "The maximum length of the word for repair_by_sorting. Longer words are included the slow way. The lower this value, the more words will be put in one sort bucket.", + (gptr*) &ft_max_word_len_for_sort, (gptr*) &ft_max_word_len_for_sort, 0, GET_ULONG, + REQUIRED_ARG, 20, 4, HA_FT_MAXLEN, 0, 1, 0}, + { "ft_stopword_file", OPT_FT_STOPWORD_FILE, + "Use stopwords from this file instead of built-in list.", + (gptr*) &ft_stopword_file, (gptr*) &ft_stopword_file, 0, GET_STR, + REQUIRED_ARG, 0, 0, 0, 0, 0, 0}, #ifdef HAVE_INNOBASE_DB {"innodb_mirrored_log_groups", OPT_INNODB_MIRRORED_LOG_GROUPS, "Number of identical copies of log groups we keep for the database. Currently this should be set to 1.", @@ -4185,8 +4411,8 @@ struct show_var_st status_vars[]= { {"Not_flushed_key_blocks", (char*) &_my_blocks_changed, SHOW_LONG_CONST}, {"Not_flushed_delayed_rows", (char*) &delayed_rows_in_use, SHOW_LONG_CONST}, {"Open_tables", (char*) 0, SHOW_OPENTABLES}, - {"Open_files", (char*) &my_file_opened, SHOW_INT_CONST}, - {"Open_streams", (char*) &my_stream_opened, SHOW_INT_CONST}, + {"Open_files", (char*) &my_file_opened, SHOW_LONG_CONST}, + {"Open_streams", (char*) &my_stream_opened, SHOW_LONG_CONST}, {"Opened_tables", (char*) &opened_tables, SHOW_LONG}, {"Questions", (char*) 0, SHOW_QUESTION}, #ifdef HAVE_QUERY_CACHE @@ -4275,7 +4501,6 @@ Starts the MySQL server\n"); printf("Usage: %s [OPTIONS]\n", my_progname); #ifdef __WIN__ puts("NT and Win32 specific options:\n\ - --console Don't remove the console window\n\ --install Install the default service (NT)\n\ --install-manual Install the default service started manually (NT)\n\ --install service_name Install an optional service (NT)\n\ @@ -4320,8 +4545,8 @@ static void set_options(void) global_system_variables.max_join_size= (ulonglong) HA_POS_ERROR; max_system_variables.max_join_size= (ulonglong) HA_POS_ERROR; -#ifdef __WIN__ - /* Allow Win32 users to move MySQL anywhere */ +#if defined(__WIN__) || defined(__NETWARE__) + /* Allow Win32 and NetWare users to move MySQL anywhere */ { char prg_dev[LIBLEN]; my_path(prg_dev,my_progname,"mysql/bin"); @@ -4423,6 +4648,9 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)), case (int) OPT_BIN_LOG: opt_bin_log=1; break; + case (int) OPT_ERROR_LOG_FILE: + opt_error_log= 1; + break; #ifdef HAVE_REPLICATION case (int) OPT_INIT_RPL_ROLE: { @@ -4645,6 +4873,15 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)), case (int) OPT_STANDALONE: /* Dummy option for NT */ break; #endif + case OPT_CONSOLE: + if (opt_console) + opt_error_log= 0; // Force logs to stdout + break; +#ifdef __NETWARE__ + case (int) OPT_AUTOCLOSE: + setscreenmode(SCR_AUTOCLOSE_ON_EXIT); + break; +#endif case (int) OPT_FLUSH: #ifdef HAVE_ISAM nisam_flush=1; @@ -4821,7 +5058,7 @@ static void get_options(int argc,char **argv) if ((ho_error=handle_options(&argc, &argv, my_long_options, get_one_option))) exit(ho_error); -#ifdef HAVE_BROKEN_REALPATH +#if defined(HAVE_BROKEN_REALPATH) my_use_symdir=0; my_disable_symlinks=1; have_symlink=SHOW_OPTION_NO; diff --git a/sql/opt_sum.cc b/sql/opt_sum.cc index 492834b5bb9..2ca6ddbab10 100644 --- a/sql/opt_sum.cc +++ b/sql/opt_sum.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -22,28 +22,55 @@ static bool find_range_key(TABLE_REF *ref, Field* field,COND *cond); -/***************************************************************************** -** This function is only called for queries with sum functions and no -** GROUP BY part. -** This substitutes constants for some COUNT(), MIN() and MAX() functions. -** The function returns 1 if all items was resolved and -1 on impossible -** conditions -****************************************************************************/ +/* + Substitutes constants for some COUNT(), MIN() and MAX() functions. + + SYNOPSIS + opt_sum_query() + tables Tables in query + all_fields All fields to be returned + conds WHERE clause + + NOTE: + This function is only called for queries with sum functions and no + GROUP BY part. + + RETURN VALUES + 0 No errors + 1 if all items was resolved + -1 on impossible conditions +*/ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds) { List_iterator_fast<Item> it(all_fields); - int const_result=1; - bool recalc_const_item=0; - table_map removed_tables=0; + int const_result= 1; + bool recalc_const_item= 0; + table_map removed_tables= 0, outer_tables= 0, used_tables= 0; + table_map where_tables= 0; Item *item; COND *org_conds= conds; - /* Add all ON conditions to WHERE condition */ + if (conds) + where_tables= conds->used_tables(); + + /* Don't replace expression on a table that is part of an outer join */ for (TABLE_LIST *tl=tables; tl ; tl= tl->next) { if (tl->on_expr) - conds= and_expressions(conds, tl->on_expr, &org_conds); + { + outer_tables|= tl->table->map; + + /* + We can't optimise LEFT JOIN in cases where the WHERE condition + restricts the table that is used, like in: + SELECT MAX(t1.a) FROM t1 LEFT JOIN t2 join-condition + WHERE t2.field IS NULL; + */ + if (tl->table->map & where_tables) + return 0; + } + used_tables|= tl->table->map; } /* @@ -68,8 +95,8 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds) TABLE_LIST *table; for (table=tables; table ; table=table->next) { - if (table->on_expr || (table->table->file->table_flags() & - HA_NOT_EXACT_COUNT)) + if (outer_tables || (table->table->file->table_flags() & + HA_NOT_EXACT_COUNT)) { const_result=0; // Can't optimize left join break; @@ -99,21 +126,35 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds) byte key_buff[MAX_KEY_LENGTH]; TABLE_REF ref; ref.key_buff=key_buff; + Item_field *item_field= ((Item_field*) expr); + TABLE *table= item_field->field->table; - if (!find_range_key(&ref, ((Item_field*) expr)->field,conds)) + if ((outer_tables & table->map) || + (!find_range_key(&ref, item_field->field,conds))) { const_result=0; break; } - TABLE *table=((Item_field*) expr)->field->table; - bool error=table->file->index_init((uint) ref.key); + bool error= table->file->index_init((uint) ref.key); + enum ha_rkey_function find_flag= HA_READ_KEY_OR_NEXT; + uint prefix_len= ref.key_length; + /* + If we are doing MIN() on a column with NULL fields + we must read the key after the NULL column + */ + if (item_field->field->null_bit) + { + ref.key_buff[ref.key_length++]=1; + find_flag= HA_READ_AFTER_KEY; + } + if (!ref.key_length) error=table->file->index_first(table->record[0]) !=0; else error=table->file->index_read(table->record[0],key_buff, ref.key_length, - HA_READ_KEY_OR_NEXT) || - key_cmp(table, key_buff, ref.key, ref.key_length); + find_flag) || + key_cmp(table, key_buff, ref.key, prefix_len); if (table->key_read) { table->key_read=0; @@ -121,7 +162,7 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds) } table->file->index_end(); if (error) - return -1; // Impossible query + return -1; // No rows matching where removed_tables|= table->map; } else if (!expr->const_item()) // This is VERY seldom false @@ -147,13 +188,14 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds) byte key_buff[MAX_KEY_LENGTH]; TABLE_REF ref; ref.key_buff=key_buff; + TABLE *table=((Item_field*) expr)->field->table; - if (!find_range_key(&ref, ((Item_field*) expr)->field,conds)) + if ((outer_tables & table->map) || + !find_range_key(&ref, ((Item_field*) expr)->field,conds)) { const_result=0; break; } - TABLE *table=((Item_field*) expr)->field->table; if ((table->file->table_flags() & HA_NOT_READ_AFTER_KEY)) { const_result=0; @@ -203,8 +245,8 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds) const_result=0; } } - if (conds && (conds->used_tables() & ~ removed_tables)) - const_result=0; + if (used_tables != removed_tables) + const_result=0; // We didn't remove all tables return const_result; } diff --git a/sql/protocol.cc b/sql/protocol.cc index a89872e087f..c338feea9bc 100644 --- a/sql/protocol.cc +++ b/sql/protocol.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -30,8 +30,12 @@ bool Protocol::net_store_data(const char *from, uint length) { ulong packet_length=packet->length(); - if (packet_length+5+length > packet->alloced_length() && - packet->realloc(packet_length+5+length)) + /* + The +9 comes from that strings of length longer than 16M require + 9 bytes to be stored (see net_store_length). + */ + if (packet_length+9+length > packet->alloced_length() && + packet->realloc(packet_length+9+length)) return 1; char *to=(char*) net_store_length((char*) packet->ptr()+packet_length, (ulonglong) length); diff --git a/sql/repl_failsafe.cc b/sql/repl_failsafe.cc index 49b061ae6b4..9a7fb2282f4 100644 --- a/sql/repl_failsafe.cc +++ b/sql/repl_failsafe.cc @@ -77,7 +77,7 @@ static int init_failsafe_rpl_thread(THD* thd) DBUG_RETURN(-1); } -#if !defined(__WIN__) && !defined(OS2) +#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) sigset_t set; VOID(sigemptyset(&set)); // Get mask in use VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals)); diff --git a/sql/set_var.cc b/sql/set_var.cc index cd02010c499..5686adb765e 100644 --- a/sql/set_var.cc +++ b/sql/set_var.cc @@ -444,11 +444,13 @@ struct show_var_st init_vars[]= { {sys_delayed_queue_size.name,(char*) &sys_delayed_queue_size, SHOW_SYS}, {sys_flush.name, (char*) &sys_flush, SHOW_SYS}, {sys_flush_time.name, (char*) &sys_flush_time, SHOW_SYS}, + {"ft_boolean_syntax", (char*) ft_boolean_syntax, SHOW_CHAR}, {"ft_min_word_len", (char*) &ft_min_word_len, SHOW_LONG}, {"ft_max_word_len", (char*) &ft_max_word_len, SHOW_LONG}, {"ft_max_word_len_for_sort",(char*) &ft_max_word_len_for_sort, SHOW_LONG}, - {"ft_boolean_syntax", (char*) ft_boolean_syntax, SHOW_CHAR}, + {"ft_stopword_file", (char*) &ft_stopword_file, SHOW_CHAR_PTR}, {"have_bdb", (char*) &have_berkeley_db, SHOW_HAVE}, + {"have_crypt", (char*) &have_crypt, SHOW_HAVE}, {"have_innodb", (char*) &have_innodb, SHOW_HAVE}, {"have_isam", (char*) &have_isam, SHOW_HAVE}, {"have_raid", (char*) &have_raid, SHOW_HAVE}, @@ -528,6 +530,7 @@ struct show_var_st init_vars[]= { {sys_net_write_timeout.name,(char*) &sys_net_write_timeout, SHOW_SYS}, {"open_files_limit", (char*) &open_files_limit, SHOW_LONG}, {"pid_file", (char*) pidfile_name, SHOW_CHAR}, + {"log_error", (char*) log_error_file, SHOW_CHAR}, {"port", (char*) &mysql_port, SHOW_INT}, {"protocol_version", (char*) &protocol_version, SHOW_INT}, {sys_pseudo_thread_id.name, (char*) &sys_pseudo_thread_id, SHOW_SYS}, diff --git a/sql/share/english/errmsg.txt b/sql/share/english/errmsg.txt index 465992e63b2..954b7cd2fb3 100644 --- a/sql/share/english/errmsg.txt +++ b/sql/share/english/errmsg.txt @@ -77,7 +77,7 @@ "BLOB column '%-.64s' can't be used in key specification with the used table type", "Too big column length for column '%-.64s' (max = %d). Use BLOB instead", "Incorrect table definition; There can only be one auto column and it must be defined as a key", -"%s: ready for connections\n", +"%s: ready for connections.\nVersion: '%s' socket: '%s' port: %d\n", "%s: Normal shutdown\n", "%s: Got signal %d. Aborting!\n", "%s: Shutdown Complete\n", diff --git a/sql/slave.cc b/sql/slave.cc index 4572a265294..4b6ebfab5c8 100644 --- a/sql/slave.cc +++ b/sql/slave.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -34,8 +34,7 @@ typedef bool (*CHECK_KILLED_FUNC)(THD*,void*); volatile bool slave_sql_running = 0, slave_io_running = 0; char* slave_load_tmpdir = 0; -MASTER_INFO main_mi; -MASTER_INFO* active_mi; +MASTER_INFO *active_mi; volatile int active_mi_in_use = 0; HASH replicate_do_table, replicate_ignore_table; DYNAMIC_ARRAY replicate_wild_do_table, replicate_wild_ignore_table; @@ -78,14 +77,23 @@ static int check_master_version(MYSQL* mysql, MASTER_INFO* mi); char* rewrite_db(char* db); -/***************************************************************************** - - init_thread_mask() - - Get a bit mask for which threads are running so that we can later restart - these threads. +/* + Find out which replications threads are running -*****************************************************************************/ + SYNOPSIS + init_thread_mask() + mask Return value here + mi master_info for slave + inverse If set, returns which threads are not running + + IMPLEMENTATION + Get a bit mask for which threads are running so that we can later restart + these threads. + + RETURN + mask If inverse == 0, running threads + If inverse == 1, stopped threads +*/ void init_thread_mask(int* mask,MASTER_INFO* mi,bool inverse) { @@ -100,11 +108,11 @@ void init_thread_mask(int* mask,MASTER_INFO* mi,bool inverse) *mask = tmp_mask; } -/***************************************************************************** +/* lock_slave_threads() +*/ -*****************************************************************************/ void lock_slave_threads(MASTER_INFO* mi) { //TODO: see if we can do this without dual mutex @@ -112,11 +120,11 @@ void lock_slave_threads(MASTER_INFO* mi) pthread_mutex_lock(&mi->rli.run_lock); } -/***************************************************************************** +/* unlock_slave_threads() +*/ -*****************************************************************************/ void unlock_slave_threads(MASTER_INFO* mi) { //TODO: see if we can do this without dual mutex @@ -124,11 +132,9 @@ void unlock_slave_threads(MASTER_INFO* mi) pthread_mutex_unlock(&mi->run_lock); } -/***************************************************************************** - init_slave() +/* Initialize slave structures */ -*****************************************************************************/ int init_slave() { DBUG_ENTER("init_slave"); @@ -137,18 +143,19 @@ int init_slave() TODO: re-write this to interate through the list of files for multi-master */ - active_mi = &main_mi; + active_mi= new MASTER_INFO; /* If master_host is not specified, try to read it from the master_info file. If master_host is specified, create the master_info file if it doesn't exists. */ - if (init_master_info(active_mi,master_info_file,relay_log_info_file, + if (!active_mi || + init_master_info(active_mi,master_info_file,relay_log_info_file, !master_host)) { - sql_print_error("Warning: failed to initialized master info"); - DBUG_RETURN(0); + sql_print_error("Note: Failed to initialized master info"); + goto err; } /* @@ -166,26 +173,24 @@ int init_slave() master_info_file, relay_log_info_file, SLAVE_IO | SLAVE_SQL)) + { sql_print_error("Warning: Can't create threads to handle slave"); + goto err; + } } DBUG_RETURN(0); -} -/***************************************************************************** +err: + DBUG_RETURN(1); +} - free_table_ent() -*****************************************************************************/ static void free_table_ent(TABLE_RULE_ENT* e) { my_free((gptr) e, MYF(0)); } -/***************************************************************************** - - get_table_key() -*****************************************************************************/ static byte* get_table_key(TABLE_RULE_ENT* e, uint* len, my_bool not_used __attribute__((unused))) { @@ -193,10 +198,8 @@ static byte* get_table_key(TABLE_RULE_ENT* e, uint* len, return (byte*)e->db; } -/***************************************************************************** - - init_relay_log_pos() +/* Open the given relay log SYNOPSIS @@ -223,8 +226,8 @@ static byte* get_table_key(TABLE_RULE_ENT* e, uint* len, RETURN VALUES 0 ok 1 error. errmsg is set to point to the error message +*/ -*****************************************************************************/ int init_relay_log_pos(RELAY_LOG_INFO* rli,const char* log, ulonglong pos, bool need_data_lock, const char** errmsg) @@ -305,13 +308,18 @@ err: DBUG_RETURN ((*errmsg) ? 1 : 0); } -/***************************************************************************** - init_slave_skip_errors() +/* + Init functio to set up array for errors that should be skipped for slave - called from get_options() in mysqld.cc on start-up + SYNOPSIS + init_slave_skip_errors() + arg List of errors numbers to skip, separated with ',' + + NOTES + Called from get_options() in mysqld.cc on start-up +*/ -*****************************************************************************/ void init_slave_skip_errors(const char* arg) { const char *p; @@ -340,13 +348,14 @@ void init_slave_skip_errors(const char* arg) } } -/***************************************************************************** +/* purge_relay_logs() - Assumes to have a run lock on rli and that no slave thread are running. + NOTES + Assumes to have a run lock on rli and that no slave thread are running. +*/ -*****************************************************************************/ int purge_relay_logs(RELAY_LOG_INFO* rli, THD *thd, bool just_reset, const char** errmsg) { @@ -391,11 +400,6 @@ err: } -/***************************************************************************** - - terminate_slave_threads() - -*****************************************************************************/ int terminate_slave_threads(MASTER_INFO* mi,int thread_mask,bool skip_lock) { if (!mi->inited) @@ -438,11 +442,7 @@ int terminate_slave_threads(MASTER_INFO* mi,int thread_mask,bool skip_lock) DBUG_RETURN(0); } -/***************************************************************************** - - terminate_slave_thread() -*****************************************************************************/ int terminate_slave_thread(THD* thd, pthread_mutex_t* term_lock, pthread_mutex_t *cond_lock, pthread_cond_t* term_cond, @@ -487,11 +487,6 @@ int terminate_slave_thread(THD* thd, pthread_mutex_t* term_lock, } -/***************************************************************************** - - start_slave_thread() - -*****************************************************************************/ int start_slave_thread(pthread_handler h_func, pthread_mutex_t *start_lock, pthread_mutex_t *cond_lock, pthread_cond_t *start_cond, @@ -554,15 +549,16 @@ int start_slave_thread(pthread_handler h_func, pthread_mutex_t *start_lock, DBUG_RETURN(0); } -/***************************************************************************** +/* start_slave_threads() - SLAVE_FORCE_ALL is not implemented here on purpose since it does not make - sense to do that for starting a slave--we always care if it actually - started the threads that were not previously running + NOTES + SLAVE_FORCE_ALL is not implemented here on purpose since it does not make + sense to do that for starting a slave--we always care if it actually + started the threads that were not previously running +*/ -*****************************************************************************/ int start_slave_threads(bool need_slave_mutex, bool wait_for_start, MASTER_INFO* mi, const char* master_info_fname, const char* slave_info_fname, int thread_mask) @@ -602,11 +598,7 @@ int start_slave_threads(bool need_slave_mutex, bool wait_for_start, DBUG_RETURN(error); } -/***************************************************************************** - - init_table_rule_hash() -*****************************************************************************/ void init_table_rule_hash(HASH* h, bool* h_inited) { hash_init(h, system_charset_info,TABLE_RULE_HASH_SIZE,0,0, @@ -615,11 +607,7 @@ void init_table_rule_hash(HASH* h, bool* h_inited) *h_inited = 1; } -/***************************************************************************** - init_table_rule_array() - -*****************************************************************************/ void init_table_rule_array(DYNAMIC_ARRAY* a, bool* a_inited) { my_init_dynamic_array(a, sizeof(TABLE_RULE_ENT*), TABLE_RULE_ARR_SIZE, @@ -627,11 +615,7 @@ void init_table_rule_array(DYNAMIC_ARRAY* a, bool* a_inited) *a_inited = 1; } -/***************************************************************************** - - find_wild() -*****************************************************************************/ static TABLE_RULE_ENT* find_wild(DYNAMIC_ARRAY *a, const char* key, int len) { uint i; @@ -651,52 +635,121 @@ static TABLE_RULE_ENT* find_wild(DYNAMIC_ARRAY *a, const char* key, int len) return 0; } -/***************************************************************************** - tables_ok() +/* + Checks whether tables match some (wild_)do_table and (wild_)ignore_table + rules (for replication) + + SYNOPSIS + tables_ok() + thd thread (SQL slave thread normally) + tables list of tables to check + + NOTES + Note that changing the order of the tables in the list can lead to + different results. Note also the order of precedence of the do/ignore + rules (see code below). For that reason, users should not set conflicting + rules because they may get unpredicted results. + + RETURN VALUES + 0 should not be logged/replicated + 1 should be logged/replicated +*/ -*****************************************************************************/ int tables_ok(THD* thd, TABLE_LIST* tables) { + DBUG_ENTER("tables_ok"); + for (; tables; tables = tables->next) { + char hash_key[2*NAME_LEN+2]; + char *end; + uint len; + if (!tables->updating) continue; - char hash_key[2*NAME_LEN+2]; - char* p; - p = strmov(hash_key, tables->db ? tables->db : thd->db); - *p++ = '.'; - uint len = strmov(p, tables->real_name) - hash_key ; + end= strmov(hash_key, tables->db ? tables->db : thd->db); + *end++= '.'; + len= (uint) (strmov(end, tables->real_name) - hash_key); if (do_table_inited) // if there are any do's { if (hash_search(&replicate_do_table, (byte*) hash_key, len)) - return 1; + DBUG_RETURN(1); } if (ignore_table_inited) // if there are any ignores { if (hash_search(&replicate_ignore_table, (byte*) hash_key, len)) - return 0; + DBUG_RETURN(0); } if (wild_do_table_inited && find_wild(&replicate_wild_do_table, hash_key, len)) - return 1; + DBUG_RETURN(1); if (wild_ignore_table_inited && find_wild(&replicate_wild_ignore_table, hash_key, len)) - return 0; + DBUG_RETURN(0); } /* If no explicit rule found and there was a do list, do not replicate. If there was no do list, go ahead */ - return !do_table_inited && !wild_do_table_inited; + DBUG_RETURN(!do_table_inited && !wild_do_table_inited); } -/***************************************************************************** - add_table_rule() +/* + Checks whether a db matches wild_do_table and wild_ignore_table + rules (for replication) + + SYNOPSIS + db_ok_with_wild_table() + db name of the db to check. + Is tested with check_db_name() before calling this function. + + NOTES + Here is the reason for this function. + We advise users who want to exclude a database 'db1' safely to do it + with replicate_wild_ignore_table='db1.%' instead of binlog_ignore_db or + replicate_ignore_db because the two lasts only check for the selected db, + which won't work in that case: + USE db2; + UPDATE db1.t SET ... #this will be replicated and should not + whereas replicate_wild_ignore_table will work in all cases. + With replicate_wild_ignore_table, we only check tables. When + one does 'DROP DATABASE db1', tables are not involved and the + statement will be replicated, while users could expect it would not (as it + rougly means 'DROP db1.first_table, DROP db1.second_table...'). + In other words, we want to interpret 'db1.%' as "everything touching db1". + That is why we want to match 'db1' against 'db1.%' wild table rules. + + RETURN VALUES + 0 should not be logged/replicated + 1 should be logged/replicated + */ + +int db_ok_with_wild_table(const char *db) +{ + char hash_key[NAME_LEN+2]; + char *end; + int len; + end= strmov(hash_key, db); + *end++= '.'; + len= end - hash_key ; + if (wild_do_table_inited && find_wild(&replicate_wild_do_table, + hash_key, len)) + return 1; + if (wild_ignore_table_inited && find_wild(&replicate_wild_ignore_table, + hash_key, len)) + return 0; + + /* + If no explicit rule found and there was a do list, do not replicate. + If there was no do list, go ahead + */ + return !wild_do_table_inited; +} + -*****************************************************************************/ int add_table_rule(HASH* h, const char* table_spec) { const char* dot = strchr(table_spec, '.'); @@ -714,11 +767,11 @@ int add_table_rule(HASH* h, const char* table_spec) return 0; } -/***************************************************************************** - add_wild_table_rule() +/* + Add table expression with wildcards to dynamic array +*/ -*****************************************************************************/ int add_wild_table_rule(DYNAMIC_ARRAY* a, const char* table_spec) { const char* dot = strchr(table_spec, '.'); @@ -735,11 +788,7 @@ int add_wild_table_rule(DYNAMIC_ARRAY* a, const char* table_spec) return 0; } -/***************************************************************************** - free_string_array() - -*****************************************************************************/ static void free_string_array(DYNAMIC_ARRAY *a) { uint i; @@ -752,11 +801,7 @@ static void free_string_array(DYNAMIC_ARRAY *a) delete_dynamic(a); } -/***************************************************************************** - - end_slave_on_walk() -*****************************************************************************/ #ifdef NOT_USED_YET static int end_slave_on_walk(MASTER_INFO* mi, gptr /*unused*/) { @@ -765,35 +810,39 @@ static int end_slave_on_walk(MASTER_INFO* mi, gptr /*unused*/) } #endif -/***************************************************************************** - end_slave() +/* + Free all resources used by slave + + SYNOPSIS + end_slave() +*/ -*****************************************************************************/ void end_slave() { - /* - TODO: replace the line below with - list_walk(&master_list, (list_walk_action)end_slave_on_walk,0); - once multi-master code is ready. - */ - terminate_slave_threads(active_mi,SLAVE_FORCE_ALL); - end_master_info(active_mi); - if (do_table_inited) - hash_free(&replicate_do_table); - if (ignore_table_inited) - hash_free(&replicate_ignore_table); - if (wild_do_table_inited) - free_string_array(&replicate_wild_do_table); - if (wild_ignore_table_inited) - free_string_array(&replicate_wild_ignore_table); + if (active_mi) + { + /* + TODO: replace the line below with + list_walk(&master_list, (list_walk_action)end_slave_on_walk,0); + once multi-master code is ready. + */ + terminate_slave_threads(active_mi,SLAVE_FORCE_ALL); + end_master_info(active_mi); + if (do_table_inited) + hash_free(&replicate_do_table); + if (ignore_table_inited) + hash_free(&replicate_ignore_table); + if (wild_do_table_inited) + free_string_array(&replicate_wild_do_table); + if (wild_ignore_table_inited) + free_string_array(&replicate_wild_ignore_table); + delete active_mi; + active_mi= 0; + } } -/***************************************************************************** - - io_slave_killed() -*****************************************************************************/ static bool io_slave_killed(THD* thd, MASTER_INFO* mi) { DBUG_ASSERT(mi->io_thd == thd); @@ -801,11 +850,7 @@ static bool io_slave_killed(THD* thd, MASTER_INFO* mi) return mi->abort_slave || abort_loop || thd->killed; } -/***************************************************************************** - sql_slave_killed() - -*****************************************************************************/ static bool sql_slave_killed(THD* thd, RELAY_LOG_INFO* rli) { DBUG_ASSERT(rli->sql_thd == thd); @@ -813,11 +858,7 @@ static bool sql_slave_killed(THD* thd, RELAY_LOG_INFO* rli) return rli->abort_slave || abort_loop || thd->killed; } -/***************************************************************************** - - slave_print_error() -*****************************************************************************/ void slave_print_error(RELAY_LOG_INFO* rli, int err_code, const char* msg, ...) { va_list args; @@ -829,13 +870,13 @@ void slave_print_error(RELAY_LOG_INFO* rli, int err_code, const char* msg, ...) rli->last_slave_errno = err_code; } -/***************************************************************************** - +/* skip_load_data_infile() - This is used to tell a 3.23 master to break send_file() + NOTES + This is used to tell a 3.23 master to break send_file() +*/ -*****************************************************************************/ void skip_load_data_infile(NET *net) { (void)net_request_file(net, "/dev/null"); @@ -843,22 +884,14 @@ void skip_load_data_infile(NET *net) (void)net_write_command(net, 0, "", 0, "", 0); // Send ok } -/***************************************************************************** - net_request_file() - -*****************************************************************************/ bool net_request_file(NET* net, const char* fname) { DBUG_ENTER("net_request_file"); DBUG_RETURN(net_write_command(net, 251, fname, strlen(fname), "", 0)); } -/***************************************************************************** - - rewrite_db() -*****************************************************************************/ char* rewrite_db(char* db) { if (replicate_rewrite_db.is_empty() || !db) @@ -874,11 +907,22 @@ char* rewrite_db(char* db) return db; } -/***************************************************************************** - db_ok() +/* + Checks whether a db matches some do_db and ignore_db rules + (for logging or replication) + + SYNOPSIS + db_ok() + db name of the db to check + do_list either binlog_do_db or replicate_do_db + ignore_list either binlog_ignore_db or replicate_ignore_db + + RETURN VALUES + 0 should not be logged/replicated + 1 should be logged/replicated +*/ -*****************************************************************************/ int db_ok(const char* db, I_List<i_string> &do_list, I_List<i_string> &ignore_list ) { @@ -918,11 +962,7 @@ int db_ok(const char* db, I_List<i_string> &do_list, } } -/***************************************************************************** - init_strvar_from_file() - -*****************************************************************************/ static int init_strvar_from_file(char *var, int max_size, IO_CACHE *f, const char *default_val) { @@ -951,11 +991,7 @@ static int init_strvar_from_file(char *var, int max_size, IO_CACHE *f, return 1; } -/***************************************************************************** - - init_intvar_from_file() -*****************************************************************************/ static int init_intvar_from_file(int* var, IO_CACHE* f, int default_val) { char buf[32]; @@ -973,11 +1009,7 @@ static int init_intvar_from_file(int* var, IO_CACHE* f, int default_val) return 1; } -/***************************************************************************** - check_master_version() - -*****************************************************************************/ static int check_master_version(MYSQL* mysql, MASTER_INFO* mi) { const char* errmsg= 0; @@ -1003,11 +1035,7 @@ static int check_master_version(MYSQL* mysql, MASTER_INFO* mi) return 0; } -/***************************************************************************** - - create_table_from_dump() -*****************************************************************************/ static int create_table_from_dump(THD* thd, NET* net, const char* db, const char* table_name) { @@ -1110,11 +1138,7 @@ err: return error; } -/***************************************************************************** - - fetch_master_table() -*****************************************************************************/ int fetch_master_table(THD *thd, const char *db_name, const char *table_name, MASTER_INFO *mi, MYSQL *mysql) { @@ -1161,11 +1185,8 @@ int fetch_master_table(THD *thd, const char *db_name, const char *table_name, send_error(thd, error, errmsg); DBUG_RETURN(test(error)); // Return 1 on error } -/***************************************************************************** - end_master_info() -*****************************************************************************/ void end_master_info(MASTER_INFO* mi) { DBUG_ENTER("end_master_info"); @@ -1184,11 +1205,7 @@ void end_master_info(MASTER_INFO* mi) DBUG_VOID_RETURN; } -/***************************************************************************** - init_relay_log_info() - -*****************************************************************************/ int init_relay_log_info(RELAY_LOG_INFO* rli, const char* info_fname) { char fname[FN_REFLEN+128]; @@ -1322,11 +1339,7 @@ err: DBUG_RETURN(1); } -/***************************************************************************** - - add_relay_log() -*****************************************************************************/ static inline int add_relay_log(RELAY_LOG_INFO* rli,LOG_INFO* linfo) { MY_STAT s; @@ -1345,11 +1358,7 @@ static inline int add_relay_log(RELAY_LOG_INFO* rli,LOG_INFO* linfo) DBUG_RETURN(0); } -/***************************************************************************** - - wait_for_relay_log_space() -*****************************************************************************/ static bool wait_for_relay_log_space(RELAY_LOG_INFO* rli) { bool slave_killed=0; @@ -1373,11 +1382,7 @@ static bool wait_for_relay_log_space(RELAY_LOG_INFO* rli) DBUG_RETURN(slave_killed); } -/***************************************************************************** - count_relay_log_space() - -*****************************************************************************/ static int count_relay_log_space(RELAY_LOG_INFO* rli) { LOG_INFO linfo; @@ -1396,11 +1401,7 @@ static int count_relay_log_space(RELAY_LOG_INFO* rli) DBUG_RETURN(0); } -/***************************************************************************** - - init_master_info() -*****************************************************************************/ int init_master_info(MASTER_INFO* mi, const char* master_info_fname, const char* slave_info_fname, bool abort_if_no_master_info_file) @@ -1518,11 +1519,7 @@ err: DBUG_RETURN(1); } -/***************************************************************************** - - register_slave_on_master() -*****************************************************************************/ int register_slave_on_master(MYSQL* mysql) { char buf[1024], *pos= buf; @@ -1560,11 +1557,7 @@ int register_slave_on_master(MYSQL* mysql) return 0; } -/***************************************************************************** - show_master_info() - -*****************************************************************************/ int show_master_info(THD* thd, MASTER_INFO* mi) { // TODO: fix this for multi-master @@ -1641,11 +1634,7 @@ int show_master_info(THD* thd, MASTER_INFO* mi) DBUG_RETURN(0); } -/***************************************************************************** - - flush_master_info() -*****************************************************************************/ bool flush_master_info(MASTER_INFO* mi) { IO_CACHE* file = &mi->file; @@ -1662,73 +1651,214 @@ bool flush_master_info(MASTER_INFO* mi) DBUG_RETURN(0); } -/***************************************************************************** - st_relay_log_info::wait_for_pos() +st_relay_log_info::st_relay_log_info() + :info_fd(-1), cur_log_fd(-1), master_log_pos(0), save_temporary_tables(0), + cur_log_old_open_count(0), log_space_total(0), + slave_skip_counter(0), abort_pos_wait(0), slave_run_id(0), + sql_thd(0), last_slave_errno(0), inited(0), abort_slave(0), + slave_running(0), log_pos_current(0), skip_log_purge(0), + inside_transaction(0) /* the default is autocommit=1 */ +{ + relay_log_name[0] = master_log_name[0] = 0; + last_slave_error[0]=0; + + + bzero(&info_file,sizeof(info_file)); + bzero(&cache_buf, sizeof(cache_buf)); + pthread_mutex_init(&run_lock, MY_MUTEX_INIT_FAST); + pthread_mutex_init(&data_lock, MY_MUTEX_INIT_FAST); + pthread_mutex_init(&log_space_lock, MY_MUTEX_INIT_FAST); + pthread_cond_init(&data_cond, NULL); + pthread_cond_init(&start_cond, NULL); + pthread_cond_init(&stop_cond, NULL); + pthread_cond_init(&log_space_cond, NULL); +} + + +st_relay_log_info::~st_relay_log_info() +{ + pthread_mutex_destroy(&run_lock); + pthread_mutex_destroy(&data_lock); + pthread_mutex_destroy(&log_space_lock); + pthread_cond_destroy(&data_cond); + pthread_cond_destroy(&start_cond); + pthread_cond_destroy(&stop_cond); + pthread_cond_destroy(&log_space_cond); +} + +/* + Waits until the SQL thread reaches (has executed up to) the + log/position or timed out. + + SYNOPSIS + wait_for_pos() + thd client thread that sent SELECT MASTER_POS_WAIT + log_name log name to wait for + log_pos position to wait for + timeout timeout in seconds before giving up waiting + + NOTES + timeout is longlong whereas it should be ulong ; but this is + to catch if the user submitted a negative timeout. + + RETURN VALUES + -2 improper arguments (log_pos<0) + or slave not running, or master info changed + during the function's execution, + or client thread killed. -2 is translated to NULL by caller + -1 timed out + >=0 number of log events the function had to wait + before reaching the desired log/position + */ -*****************************************************************************/ int st_relay_log_info::wait_for_pos(THD* thd, String* log_name, - ulonglong log_pos) + longlong log_pos, + longlong timeout) { if (!inited) return -1; int event_count = 0; ulong init_abort_pos_wait; + int error=0; + struct timespec abstime; // for timeout checking + set_timespec(abstime,timeout); + DBUG_ENTER("wait_for_pos"); - DBUG_PRINT("enter",("master_log_name: '%s' pos: %ld", - master_log_name, (ulong) master_log_pos)); + DBUG_PRINT("enter",("master_log_name: '%s' pos: %lu timeout: %ld", + master_log_name, (ulong) master_log_pos, + (long) timeout)); pthread_mutex_lock(&data_lock); - // abort only if master info changes during wait + /* + This function will abort when it notices that + some CHANGE MASTER or RESET MASTER has changed + the master info. To catch this, these commands + modify abort_pos_wait ; we just monitor abort_pos_wait + and see if it has changed. + */ init_abort_pos_wait= abort_pos_wait; + /* + We'll need to + handle all possible log names comparisons (e.g. 999 vs 1000). + We use ulong for string->number conversion ; this is no + stronger limitation than in find_uniq_filename in sql/log.cc + */ + ulong log_name_extension; + char log_name_tmp[FN_REFLEN]; //make a char[] from String + char *end= strmake(log_name_tmp, log_name->ptr(), min(log_name->length(), + FN_REFLEN-1)); + char *p= fn_ext(log_name_tmp); + char *p_end; + if (!*p || log_pos<0) + { + error= -2; //means improper arguments + goto err; + } + //p points to '.' + log_name_extension= strtoul(++p, &p_end, 10); + /* + p_end points to the first invalid character. + If it equals to p, no digits were found, error. + If it contains '\0' it means conversion went ok. + */ + if (p_end==p || *p_end) + { + error= -2; + goto err; + } + + //"compare and wait" main loop while (!thd->killed && - init_abort_pos_wait == abort_pos_wait && - mi->slave_running) + init_abort_pos_wait == abort_pos_wait && + mi->slave_running) { bool pos_reached; - int different_file= 0; + int cmp_result= 0; DBUG_ASSERT(*master_log_name || master_log_pos == 0); if (*master_log_name) { + char *basename= master_log_name + dirname_length(master_log_name); /* - TODO: - Replace strncmp() with a comparison function that - can handle comparison of the following files: - mysqlbin.999 - mysqlbin.1000 + First compare the parts before the extension. + Find the dot in the master's log basename, + and protect against user's input error : + if the names do not match up to '.' included, return error */ - char *basename= master_log_name + dirname_length(master_log_name); - different_file = strncmp(basename, log_name->ptr(), - log_name->length()); + char *q= (char*)(fn_ext(basename)+1); + if (strncmp(basename, log_name_tmp, (int)(q-basename))) + { + error= -2; + break; + } + // Now compare extensions. + char *q_end; + ulong master_log_name_extension= strtoul(q, &q_end, 10); + if (master_log_name_extension < log_name_extension) + cmp_result = -1 ; + else + cmp_result= (master_log_name_extension > log_name_extension) ? 1 : 0 ; } - pos_reached = ((!different_file && master_log_pos >= log_pos) || - different_file > 0); + pos_reached = ((!cmp_result && master_log_pos >= (ulonglong)log_pos) || + cmp_result > 0); if (pos_reached || thd->killed) break; + + //wait for master update, with optional timeout. DBUG_PRINT("info",("Waiting for master update")); const char* msg = thd->enter_cond(&data_cond, &data_lock, - "Waiting for master update"); - pthread_cond_wait(&data_cond, &data_lock); + "Waiting for master update"); + if (timeout > 0) + { + /* + Note that pthread_cond_timedwait checks for the timeout + before for the condition ; i.e. it returns ETIMEDOUT + if the system time equals or exceeds the time specified by abstime + before the condition variable is signaled or broadcast, _or_ if + the absolute time specified by abstime has already passed at the time + of the call. + For that reason, pthread_cond_timedwait will do the "timeoutting" job + even if its condition is always immediately signaled (case of a loaded + master). + */ + error=pthread_cond_timedwait(&data_cond, &data_lock, &abstime); + } + else + pthread_cond_wait(&data_cond, &data_lock); thd->exit_cond(msg); + if (error == ETIMEDOUT || error == ETIME) + { + error= -1; + break; + } + error=0; event_count++; } + +err: pthread_mutex_unlock(&data_lock); - DBUG_PRINT("exit",("killed: %d abort: %d slave_running: %d", - (int) thd->killed, - (int) (init_abort_pos_wait != abort_pos_wait), - (int) mi->slave_running)); - DBUG_RETURN((thd->killed || init_abort_pos_wait != abort_pos_wait || - !mi->slave_running) ? - -1 : event_count); + DBUG_PRINT("exit",("killed: %d abort: %d slave_running: %d \ +improper_arguments: %d timed_out: %d", + (int) thd->killed, + (int) (init_abort_pos_wait != abort_pos_wait), + (int) mi->slave_running, + (int) (error == -2), + (int) (error == -1))); + if (thd->killed || init_abort_pos_wait != abort_pos_wait || + !mi->slave_running) + { + error= -2; + } + DBUG_RETURN( error ? error : event_count ); } -/***************************************************************************** +/* init_slave_thread() +*/ -*****************************************************************************/ static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type) { DBUG_ENTER("init_slave_thread"); @@ -1753,7 +1883,7 @@ static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type) DBUG_RETURN(-1); } -#if !defined(__WIN__) && !defined(OS2) +#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) sigset_t set; VOID(sigemptyset(&set)); // Get mask in use VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals)); @@ -1771,11 +1901,7 @@ static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type) DBUG_RETURN(0); } -/***************************************************************************** - - safe_sleep() -*****************************************************************************/ static int safe_sleep(THD* thd, int sec, CHECK_KILLED_FUNC thread_killed, void* thread_killed_arg) { @@ -1804,11 +1930,7 @@ static int safe_sleep(THD* thd, int sec, CHECK_KILLED_FUNC thread_killed, return 0; } -/***************************************************************************** - request_dump() - -*****************************************************************************/ static int request_dump(MYSQL* mysql, MASTER_INFO* mi, bool *suppress_warnings) { @@ -1843,11 +1965,7 @@ static int request_dump(MYSQL* mysql, MASTER_INFO* mi, DBUG_RETURN(0); } -/***************************************************************************** - - request_table_dump() -*****************************************************************************/ static int request_table_dump(MYSQL* mysql, const char* db, const char* table) { char buf[1024]; @@ -1877,10 +1995,7 @@ command"); } -/***************************************************************************** - - read_event() - +/* Read one event from the master SYNOPSIS @@ -1895,8 +2010,8 @@ command"); RETURN VALUES 'packet_error' Error number Length of packet +*/ -*****************************************************************************/ static ulong read_event(MYSQL* mysql, MASTER_INFO *mi, bool* suppress_warnings) { ulong len; @@ -1945,11 +2060,7 @@ server_errno=%d)", return len - 1; } -/***************************************************************************** - - check_expected_error() -*****************************************************************************/ int check_expected_error(THD* thd, RELAY_LOG_INFO* rli, int expected_error) { switch (expected_error) { @@ -1971,11 +2082,7 @@ point. If you are sure that your master is ok, run this query manually on the\ } } -/***************************************************************************** - exec_relay_log_event() - -*****************************************************************************/ static int exec_relay_log_event(THD* thd, RELAY_LOG_INFO* rli) { DBUG_ASSERT(rli->sql_thd==thd); @@ -2040,9 +2147,8 @@ This may also be a network problem, or just a bug in the master or slave code.\ } } -/***************************************************************************** - Slave I/O Thread entry point -*****************************************************************************/ + +/* Slave I/O Thread entry point */ extern "C" pthread_handler_decl(handle_slave_io,arg) { @@ -2303,20 +2409,21 @@ err: THD_CHECK_SENTRY(thd); delete thd; pthread_mutex_unlock(&LOCK_thread_count); - my_thread_end(); // clean-up before broadcast pthread_cond_broadcast(&mi->stop_cond); // tell the world we are done pthread_mutex_unlock(&mi->run_lock); #ifndef DBUG_OFF if (abort_slave_event_count && !events_till_abort) goto slave_begin; #endif + my_thread_end(); +#ifndef __NETWARE__ pthread_exit(0); +#endif /* __NETWARE__ */ DBUG_RETURN(0); // Can't return anything here } -/***************************************************************************** - Slave SQL Thread entry point -*****************************************************************************/ + +/* Slave SQL Thread entry point */ extern "C" pthread_handler_decl(handle_slave_sql,arg) { @@ -2443,7 +2550,6 @@ the slave SQL thread with \"SLAVE START\". We stopped at log \ THD_CHECK_SENTRY(thd); delete thd; pthread_mutex_unlock(&LOCK_thread_count); - my_thread_end(); // clean-up before broadcasting termination pthread_cond_broadcast(&rli->stop_cond); // tell the world we are done pthread_mutex_unlock(&rli->run_lock); @@ -2451,15 +2557,18 @@ the slave SQL thread with \"SLAVE START\". We stopped at log \ if (abort_slave_event_count && !rli->events_till_abort) goto slave_begin; #endif + my_thread_end(); +#ifndef __NETWARE__ pthread_exit(0); +#endif /* __NETWARE__ */ DBUG_RETURN(0); // Can't return anything here } -/***************************************************************************** +/* process_io_create_file() +*/ -*****************************************************************************/ static int process_io_create_file(MASTER_INFO* mi, Create_file_log_event* cev) { int error = 1; @@ -2491,9 +2600,10 @@ static int process_io_create_file(MASTER_INFO* mi, Create_file_log_event* cev) goto err; } - /* this dummy block is so we could instantiate Append_block_log_event - once and then modify it slightly instead of doing it multiple times - in the loop + /* + This dummy block is so we could instantiate Append_block_log_event + once and then modify it slightly instead of doing it multiple times + in the loop */ { Append_block_log_event aev(thd,0,0,0); @@ -2554,10 +2664,8 @@ err: DBUG_RETURN(error); } -/***************************************************************************** - - process_io_rotate() +/* Start using a new binary log on the master SYNOPSIS @@ -2576,7 +2684,8 @@ err: 0 ok 1 Log event is illegal -*****************************************************************************/ +*/ + static int process_io_rotate(MASTER_INFO *mi, Rotate_log_event *rev) { int return_val= 1; @@ -2601,15 +2710,15 @@ static int process_io_rotate(MASTER_INFO *mi, Rotate_log_event *rev) DBUG_RETURN(0); } -/***************************************************************************** +/* queue_old_event() TODO: Test this code before release - it has to be tested on a separate setup with 3.23 master +*/ -*****************************************************************************/ static int queue_old_event(MASTER_INFO *mi, const char *buf, ulong event_len) { @@ -2697,14 +2806,14 @@ static int queue_old_event(MASTER_INFO *mi, const char *buf, DBUG_RETURN(0); } -/***************************************************************************** +/* queue_event() TODO: verify the issue with stop events, see if we need them at all in the relay log +*/ -*****************************************************************************/ int queue_event(MASTER_INFO* mi,const char* buf, ulong event_len) { int error= 0; @@ -2757,11 +2866,7 @@ int queue_event(MASTER_INFO* mi,const char* buf, ulong event_len) DBUG_RETURN(error); } -/***************************************************************************** - - end_relay_log_info() -*****************************************************************************/ void end_relay_log_info(RELAY_LOG_INFO* rli) { DBUG_ENTER("end_relay_log_info"); @@ -2786,26 +2891,35 @@ void end_relay_log_info(RELAY_LOG_INFO* rli) DBUG_VOID_RETURN; } -/***************************************************************************** +/* + Try to connect until successful or slave killed - safe_connect() + SYNPOSIS + safe_connect() + thd Thread handler for slave + mysql MySQL connection handle + mi Replication handle - Try to connect until successful or slave killed + RETURN + 0 ok + # Error +*/ -*****************************************************************************/ static int safe_connect(THD* thd, MYSQL* mysql, MASTER_INFO* mi) { return connect_to_master(thd, mysql, mi, 0, 0); } -/***************************************************************************** - connect_to_master() +/* + SYNPOSIS + connect_to_master() - Try to connect until successful or slave killed or we have retried - master_retry_count times + IMPLEMENTATION + Try to connect until successful or slave killed or we have retried + master_retry_count times +*/ -*****************************************************************************/ static int connect_to_master(THD* thd, MYSQL* mysql, MASTER_INFO* mi, bool reconnect, bool suppress_warnings) { @@ -2884,24 +2998,23 @@ replication resumed in log '%s' at position %s", mi->user, DBUG_RETURN(slave_was_killed); } -/***************************************************************************** +/* safe_reconnect() - Try to connect until successful or slave killed or we have retried - master_retry_count times + IMPLEMENTATION + Try to connect until successful or slave killed or we have retried + master_retry_count times +*/ -*****************************************************************************/ static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi, bool suppress_warnings) { return connect_to_master(thd, mysql, mi, 1, suppress_warnings); } -/***************************************************************************** - - flush_relay_log_info() +/* Store the file and position where the execute-slave thread are in the relay log. @@ -2928,8 +3041,8 @@ static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi, RETURN VALUES 0 ok 1 write error +*/ -*****************************************************************************/ bool flush_relay_log_info(RELAY_LOG_INFO* rli) { bool error=0; @@ -2958,13 +3071,11 @@ bool flush_relay_log_info(RELAY_LOG_INFO* rli) return error; } -/***************************************************************************** - - reopen_relay_log() +/* Called when we notice that the current "hot" log got rotated under our feet. +*/ -*****************************************************************************/ static IO_CACHE *reopen_relay_log(RELAY_LOG_INFO *rli, const char **errmsg) { DBUG_ASSERT(rli->cur_log != &rli->cache_buf); @@ -2984,11 +3095,7 @@ static IO_CACHE *reopen_relay_log(RELAY_LOG_INFO *rli, const char **errmsg) DBUG_RETURN(cur_log); } -/***************************************************************************** - - next_event() -*****************************************************************************/ Log_event* next_event(RELAY_LOG_INFO* rli) { Log_event* ev; diff --git a/sql/slave.h b/sql/slave.h index 8122975a809..5dd7fe8072b 100644 --- a/sql/slave.h +++ b/sql/slave.h @@ -117,7 +117,7 @@ typedef struct st_relay_log_info created temporary tables. Modified only on init/end and by the SQL thread, read only by SQL thread. */ - TABLE* save_temporary_tables; + TABLE *save_temporary_tables; /* standard lock acquistion order to avoid deadlocks: @@ -190,33 +190,8 @@ typedef struct st_relay_log_info bool skip_log_purge; bool inside_transaction; - st_relay_log_info() - :info_fd(-1),cur_log_fd(-1), cur_log_old_open_count(0), abort_pos_wait(0), - slave_run_id(0), inited(0), abort_slave(0), slave_running(0), - log_pos_current(0), skip_log_purge(0), - inside_transaction(0) /* the default is autocommit=1 */ - { - relay_log_name[0] = master_log_name[0] = 0; - bzero(&info_file,sizeof(info_file)); - bzero(&cache_buf, sizeof(cache_buf)); - pthread_mutex_init(&run_lock, MY_MUTEX_INIT_FAST); - pthread_mutex_init(&data_lock, MY_MUTEX_INIT_FAST); - pthread_mutex_init(&log_space_lock, MY_MUTEX_INIT_FAST); - pthread_cond_init(&data_cond, NULL); - pthread_cond_init(&start_cond, NULL); - pthread_cond_init(&stop_cond, NULL); - pthread_cond_init(&log_space_cond, NULL); - } - ~st_relay_log_info() - { - pthread_mutex_destroy(&run_lock); - pthread_mutex_destroy(&data_lock); - pthread_mutex_destroy(&log_space_lock); - pthread_cond_destroy(&data_cond); - pthread_cond_destroy(&start_cond); - pthread_cond_destroy(&stop_cond); - pthread_cond_destroy(&log_space_cond); - } + st_relay_log_info(); + ~st_relay_log_info(); inline void inc_pending(ulonglong val) { pending += val; @@ -245,7 +220,8 @@ typedef struct st_relay_log_info pthread_mutex_unlock(&data_lock); } - int wait_for_pos(THD* thd, String* log_name, ulonglong log_pos); + int wait_for_pos(THD* thd, String* log_name, longlong log_pos, + longlong timeout); } RELAY_LOG_INFO; @@ -414,6 +390,7 @@ int tables_ok(THD* thd, TABLE_LIST* tables); */ int db_ok(const char* db, I_List<i_string> &do_list, I_List<i_string> &ignore_list ); +int db_ok_with_wild_table(const char *db); int add_table_rule(HASH* h, const char* table_spec); int add_wild_table_rule(DYNAMIC_ARRAY* a, const char* table_spec); diff --git a/sql/sql_acl.cc b/sql/sql_acl.cc index 3dc370b7b63..689b14caac9 100644 --- a/sql/sql_acl.cc +++ b/sql/sql_acl.cc @@ -2849,8 +2849,6 @@ int mysql_show_grants(THD *thd,LEX_USER *lex_user) VOID(pthread_mutex_lock(&acl_cache->lock)); /* Add first global access grants */ - if (acl_user->access || acl_user->password || - acl_user->ssl_type != SSL_TYPE_NONE) { want_access=acl_user->access; String global(buff,sizeof(buff),&my_charset_latin1); @@ -2983,6 +2981,8 @@ int mysql_show_grants(THD *thd,LEX_USER *lex_user) if (test_all_bits(want_access,(DB_ACLS & ~GRANT_ACL))) db.append("ALL PRIVILEGES",14); + else if (!(want_access & ~GRANT_ACL)) + db.append("USAGE",5); else { int found=0, cnt; diff --git a/sql/sql_base.cc b/sql/sql_base.cc index 21cdaa28a4f..f4a32b482b3 100644 --- a/sql/sql_base.cc +++ b/sql/sql_base.cc @@ -495,7 +495,7 @@ void close_temporary_tables(THD *thd) query_buf_size= 50; // Enough for DROP ... TABLE for (table=thd->temporary_tables ; table ; table=table->next) - query_buf_size += table->key_length; + query_buf_size+= table->key_length+1; if ((query = alloc_root(&thd->mem_root, query_buf_size))) end=strmov(query, "DROP /*!40005 TEMPORARY */ TABLE "); diff --git a/sql/sql_class.cc b/sql/sql_class.cc index 3975f65a43c..4d78a03289b 100644 --- a/sql/sql_class.cc +++ b/sql/sql_class.cc @@ -186,7 +186,7 @@ THD::THD():user_time(0), is_fatal_error(0), */ { pthread_mutex_lock(&LOCK_thread_count); - ulong tmp=(ulong) (rnd(&sql_rand) * 3000000); + ulong tmp=(ulong) (rnd(&sql_rand) * 0xffffffff); /* make all bits random */ pthread_mutex_unlock(&LOCK_thread_count); randominit(&rand, tmp + (ulong) &rand, tmp + (ulong) ::query_id); } diff --git a/sql/sql_class.h b/sql/sql_class.h index 32ad4a8fbd3..51067d94990 100644 --- a/sql/sql_class.h +++ b/sql/sql_class.h @@ -120,6 +120,7 @@ public: void init(enum_log_type log_type_arg, enum cache_type io_cache_type_arg = WRITE_CACHE, bool no_auto_events_arg = 0); + void cleanup(); bool open(const char *log_name,enum_log_type log_type, const char *new_name, const char *index_file_name_arg, enum cache_type io_cache_type_arg, @@ -409,7 +410,9 @@ void free_tmp_table(THD *thd, TABLE *entry); For each client connection we create a separate thread with THD serving as a thread/connection descriptor */ -class THD :public ilink { + +class THD :public ilink +{ public: #ifdef EMBEDDED_LIBRARY struct st_mysql *mysql; @@ -583,7 +586,7 @@ public: active_vio = 0; pthread_mutex_unlock(&LOCK_delete); } - void THD::close_active_vio(); + void close_active_vio(); #endif void awake(bool prepare_to_die); inline const char* enter_cond(pthread_cond_t *cond, pthread_mutex_t* mutex, @@ -965,12 +968,7 @@ public: class multi_delete : public select_result { TABLE_LIST *delete_tables, *table_being_deleted; -#ifdef SINISAS_STRIP - IO_CACHE **tempfiles; - byte *memory_lane; -#else Unique **tempfiles; -#endif THD *thd; ha_rows deleted; uint num_of_tables; diff --git a/sql/sql_db.cc b/sql/sql_db.cc index 1c441ea7a26..ffc7f3c9ca2 100644 --- a/sql/sql_db.cc +++ b/sql/sql_db.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -560,8 +560,6 @@ bool mysql_change_db(THD *thd, const char *name) x_free(dbname); DBUG_RETURN(1); } - if (lower_case_table_names) - my_casedn_str(system_charset_info, dbname); DBUG_PRINT("info",("Use database: %s", dbname)); if (test_all_bits(thd->master_access,DB_ACLS)) db_access=DB_ACLS; diff --git a/sql/sql_handler.cc b/sql/sql_handler.cc index ea5c07048ab..7683abb41fe 100644 --- a/sql/sql_handler.cc +++ b/sql/sql_handler.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -42,8 +42,8 @@ thd->open_tables=thd->handler_tables; \ thd->handler_tables=tmp; } -static TABLE **find_table_ptr_by_name(THD *thd, const char *db, - const char *table_name); +static TABLE **find_table_ptr_by_name(THD *thd,const char *db, + const char *table_name, bool is_alias); int mysql_ha_open(THD *thd, TABLE_LIST *tables) { @@ -67,7 +67,7 @@ int mysql_ha_open(THD *thd, TABLE_LIST *tables) int mysql_ha_close(THD *thd, TABLE_LIST *tables, bool dont_send_ok) { - TABLE **ptr=find_table_ptr_by_name(thd, tables->db, tables->alias); + TABLE **ptr=find_table_ptr_by_name(thd, tables->db, tables->alias, 1); if (*ptr) { @@ -86,6 +86,21 @@ int mysql_ha_close(THD *thd, TABLE_LIST *tables, bool dont_send_ok) return 0; } +int mysql_ha_closeall(THD *thd, TABLE_LIST *tables, bool dont_send_ok) +{ + TABLE **ptr=find_table_ptr_by_name(thd, tables->db, tables->real_name, 0); + + DBUG_ASSERT(dont_send_ok); + if (*ptr) + { +// if (!dont_send_ok) VOID(pthread_mutex_lock(&LOCK_open)); + close_thread_table(thd, ptr); +// if (!dont_send_ok) VOID(pthread_mutex_unlock(&LOCK_open)); + } +// if (!dont_send_ok) send_ok(&thd->net); + return 0; +} + static enum enum_ha_read_modes rkey_to_rnext[]= { RNEXT, RNEXT, RPREV, RNEXT, RPREV, RNEXT, RPREV, RPREV }; @@ -96,7 +111,7 @@ int mysql_ha_read(THD *thd, TABLE_LIST *tables, ha_rows select_limit,ha_rows offset_limit) { int err, keyno=-1; - TABLE *table=*find_table_ptr_by_name(thd, tables->db, tables->alias); + TABLE *table=*find_table_ptr_by_name(thd, tables->db, tables->alias, 1); if (!table) { my_printf_error(ER_UNKNOWN_TABLE,ER(ER_UNKNOWN_TABLE),MYF(0), @@ -281,6 +296,9 @@ static TABLE **find_table_ptr_by_name(THD *thd, const char *db, for (TABLE *table= *ptr; table ; table= *ptr) { if (!memcmp(table->table_cache_key, db, dblen) && + !my_strcasecmp(system_charset_info, + (is_alias ? table->table_name : table->real_name), + table_name)) !my_strcasecmp(system_charset_info,table->table_name,alias)) break; ptr= &(table->next); diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc index 74e880eb718..0a06822d36e 100644 --- a/sql/sql_insert.cc +++ b/sql/sql_insert.cc @@ -992,7 +992,7 @@ extern "C" pthread_handler_decl(handle_delayed_insert,arg) strmov(thd->net.last_error,ER(thd->net.last_errno=ER_OUT_OF_RESOURCES)); goto end; } -#if !defined(__WIN__) && !defined(OS2) +#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) sigset_t set; VOID(sigemptyset(&set)); // Get mask in use VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals)); diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc index a9085e253b3..69e8b68bab0 100644 --- a/sql/sql_parse.cc +++ b/sql/sql_parse.cc @@ -1,4 +1,4 @@ -/* Copyright (C) 2000 MySQL AB +/* Copyright (C) 2000-2003 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -751,7 +751,7 @@ pthread_handler_decl(handle_one_connection,arg) #if defined(__WIN__) init_signals(); // IRENA; testing ? -#elif !defined(OS2) +#elif !defined(OS2) && !defined(__NETWARE__) sigset_t set; VOID(sigemptyset(&set)); // Get mask in use VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals)); @@ -781,7 +781,9 @@ pthread_handler_decl(handle_one_connection,arg) statistic_increment(aborted_connects,&LOCK_status); goto end_thread; } - +#ifdef __NETWARE__ + netware_reg_user(thd->ip, thd->user, "MySQL"); +#endif if (thd->variables.max_join_size == HA_POS_ERROR) thd->options |= OPTION_BIG_SELECTS; if (thd->client_capabilities & CLIENT_COMPRESS) @@ -850,12 +852,10 @@ extern "C" pthread_handler_decl(handle_bootstrap,arg) pthread_detach_this_thread(); thd->thread_stack= (char*) &thd; -#if !defined(__WIN__) && !defined(OS2) +#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) sigset_t set; VOID(sigemptyset(&set)); // Get mask in use VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals)); - - #endif if (thd->variables.max_join_size == HA_POS_ERROR) @@ -930,16 +930,19 @@ int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd) table_list->real_name = table_list->alias = tbl_name; table_list->lock_type = TL_READ_NO_INSERT; table_list->next = 0; - remove_escape(table_list->real_name); - - if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT))) - DBUG_RETURN(1); if (!db || check_db_name(db)) { net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL"); goto err; } + if (lower_case_table_names) + casedn_str(tbl_name); + remove_escape(table_list->real_name); + + if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT))) + DBUG_RETURN(1); + if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege)) goto err; if (grant_option && check_grant(thd, SELECT_ACL, table_list)) @@ -1172,7 +1175,6 @@ bool dispatch_command(enum enum_server_command command, THD *thd, restore_user: x_free(thd->user); - x_free(thd->db); thd->master_access=save_master_access; thd->db_access=save_db_access; thd->db=save_db; @@ -1262,8 +1264,13 @@ bool dispatch_command(enum enum_server_command command, THD *thd, if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1))) break; mysql_log.write(thd,command,"%s %s",table_list.real_name,fields); + if (lower_case_table_names) + my_casedn_str(files_charset_info, table_list.real_name); remove_escape(table_list.real_name); // This can't have wildcards + if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT))) + DBUG_RETURN(1); + if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access)) break; table_list.grant.privilege=thd->col_access; @@ -1291,8 +1298,6 @@ bool dispatch_command(enum enum_server_command command, THD *thd, net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL"); break; } - if (lower_case_table_names) - my_casedn_str(files_charset_info, db); if (check_access(thd,CREATE_ACL,db,0,1)) break; mysql_log.write(thd,command,packet); @@ -1309,8 +1314,6 @@ bool dispatch_command(enum enum_server_command command, THD *thd, net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL"); break; } - if (lower_case_table_names) - my_casedn_str(files_charset_info, db); if (check_access(thd,DROP_ACL,db,0,1)) break; if (thd->locked_tables || thd->active_transaction()) @@ -2639,8 +2642,18 @@ mysql_execute_command(THD *thd) net_printf(thd,ER_WRONG_DB_NAME, lex->name); break; } - if (lower_case_table_names) - my_casedn_str(files_charset_info, lex->name); + /* + If in a slave thread : + CREATE DATABASE DB was certainly not preceded by USE DB. + For that reason, db_ok() in sql/slave.cc did not check the + do_db/ignore_db. And as this query involves no tables, tables_ok() + above was not called. So we have to check rules again here. + */ + if (thd->slave_thread && + (!db_ok(lex->name, replicate_do_db, replicate_ignore_db) || + !db_ok_with_wild_table(lex->name))) + break; + if (check_access(thd,CREATE_ACL,lex->name,0,1)) break; res=mysql_create_db(thd,lex->name,&lex->create_info,0); @@ -2653,8 +2666,17 @@ mysql_execute_command(THD *thd) net_printf(thd,ER_WRONG_DB_NAME, lex->name); break; } - if (lower_case_table_names) - my_casedn_str(files_charset_info, lex->name); + /* + If in a slave thread : + DROP DATABASE DB may not be preceded by USE DB. + For that reason, maybe db_ok() in sql/slave.cc did not check the + do_db/ignore_db. And as this query involves no tables, tables_ok() + above was not called. So we have to check rules again here. + */ + if (thd->slave_thread && + (!db_ok(lex->name, replicate_do_db, replicate_ignore_db) || + !db_ok_with_wild_table(lex->name))) + break; if (check_access(thd,DROP_ACL,lex->name,0,1)) break; if (thd->locked_tables || thd->active_transaction()) @@ -3763,10 +3785,7 @@ TABLE_LIST *st_select_lex::add_table_to_list(THD *thd, ptr->alias= alias_str; if (lower_case_table_names) - { - my_casedn_str(files_charset_info,ptr->db); my_casedn_str(files_charset_info,table->table.str); - } ptr->real_name=table->table.str; ptr->real_name_length=table->table.length; ptr->lock_type= lock_type; @@ -3876,6 +3895,8 @@ bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables) mysql_slow_log.new_file(1); if (ha_flush_logs()) result=1; + if (flush_error_log()) + result=1; } #ifdef HAVE_QUERY_CACHE if (options & REFRESH_QUERY_CACHE_FREE) diff --git a/sql/sql_repl.cc b/sql/sql_repl.cc index 522ec9f6aeb..05a70c24bfd 100644 --- a/sql/sql_repl.cc +++ b/sql/sql_repl.cc @@ -927,18 +927,17 @@ int cmp_master_pos(const char* log_file_name1, ulonglong log_pos1, const char* log_file_name2, ulonglong log_pos2) { int res; - /* - TODO: Change compare function to work with file name of type - '.999 and .1000' - */ + uint log_file_name1_len= strlen(log_file_name1); + uint log_file_name2_len= strlen(log_file_name2); - if ((res = strcmp(log_file_name1, log_file_name2))) - return res; - if (log_pos1 > log_pos2) - return 1; - else if (log_pos1 == log_pos2) - return 0; - return -1; + // We assume that both log names match up to '.' + if (log_file_name1_len == log_file_name2_len) + { + if ((res= strcmp(log_file_name1, log_file_name2))) + return res; + return (log_pos1 < log_pos2) ? -1 : (log_pos1 == log_pos2) ? 0 : 1; + } + return ((log_file_name1_len < log_file_name2_len) ? -1 : 1); } diff --git a/sql/sql_select.cc b/sql/sql_select.cc index 981ff715c54..f61ea4e8c10 100644 --- a/sql/sql_select.cc +++ b/sql/sql_select.cc @@ -548,6 +548,16 @@ JOIN::optimize() error= -1; /* if goto err */ /* Optimize distinct away if possible */ + { + ORDER *org_order= order; + order=remove_const(this, order,conds,&simple_order); + /* + If we are using ORDER BY NULL or ORDER BY const_expression, + return result in any order (even if we are using a GROUP BY) + */ + if (!order && org_order) + skip_sort_order= 1; + } order= remove_const(this, order, conds, &simple_order); if (group_list || tmp_table_param.sum_func_count) { @@ -1011,7 +1021,7 @@ JOIN::exec() if (curr_tmp_table->group) { // Already grouped - if (!curr_join->order && !curr_join->no_order) + if (!curr_join->order && !curr_join->no_order && !skip_sort_order) curr_join->order= curr_join->group_list; /* order by group */ curr_join->group_list= 0; } @@ -3513,7 +3523,13 @@ return_zero_rows(JOIN *join, select_result *result,TABLE_LIST *tables, if (!(result->send_fields(fields,1))) { if (send_row) + { + List_iterator_fast<Item> it(fields); + Item *item; + while ((item= it++)) + item->no_rows_in_result(); result->send_data(fields); + } if (tables) // Not from do_select() { /* Close open cursors */ @@ -3947,7 +3963,7 @@ const_expression_in_where(COND *cond, Item *comp_item, Item **const_item) */ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type, - Item_result_field ***copy_func, Field **from_field, + Item ***copy_func, Field **from_field, bool group, bool modify_item) { switch (type) { @@ -4013,13 +4029,13 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type, } return new_field; } - case Item::PROC_ITEM: case Item::FUNC_ITEM: case Item::COND_ITEM: case Item::FIELD_AVG_ITEM: case Item::FIELD_STD_ITEM: case Item::SUBSELECT_ITEM: /* The following can only happen with 'CREATE TABLE ... SELECT' */ + case Item::PROC_ITEM: case Item::INT_ITEM: case Item::REAL_ITEM: case Item::STRING_ITEM: @@ -4052,10 +4068,10 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type, DBUG_ASSERT(0); break; } - if (copy_func) - *((*copy_func)++) = (Item_result_field*) item; // Save for copy_funcs + if (copy_func && item->is_result_field()) + *((*copy_func)++) = item; // Save for copy_funcs if (modify_item) - ((Item_result_field*) item)->result_field=new_field; + item->set_result_field(new_field); return new_field; } default: // Dosen't have to be stored @@ -4089,7 +4105,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields, Copy_field *copy=0; KEY *keyinfo; KEY_PART_INFO *key_part_info; - Item_result_field **copy_func; + Item **copy_func; MI_COLUMNDEF *recinfo; uint temp_pool_slot=MY_BIT_NONE; @@ -4153,7 +4169,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields, my_free((gptr) table,MYF(0)); /* purecov: inspected */ DBUG_RETURN(NULL); /* purecov: inspected */ } - param->funcs=copy_func; + param->items_to_copy= copy_func; strmov(tmpname,path); /* make table according to fields */ @@ -5681,7 +5697,7 @@ end_write(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)), if (!end_of_records) { copy_fields(&join->tmp_table_param); - copy_funcs(join->tmp_table_param.funcs); + copy_funcs(join->tmp_table_param.items_to_copy); #ifdef TO_BE_DELETED if (!table->uniques) // If not unique handling @@ -5785,7 +5801,7 @@ end_update(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)), memcpy(table->record[0]+key_part->offset, group->buff, key_part->length); init_tmptable_sum_functions(join->sum_funcs); - copy_funcs(join->tmp_table_param.funcs); + copy_funcs(join->tmp_table_param.items_to_copy); if ((error=table->file->write_row(table->record[0]))) { if (create_myisam_from_heap(join->thd, table, &join->tmp_table_param, @@ -5819,7 +5835,7 @@ end_unique_update(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)), init_tmptable_sum_functions(join->sum_funcs); copy_fields(&join->tmp_table_param); // Groups are copied twice. - copy_funcs(join->tmp_table_param.funcs); + copy_funcs(join->tmp_table_param.items_to_copy); if (!(error=table->file->write_row(table->record[0]))) join->send_records++; // New group @@ -5905,7 +5921,7 @@ end_write_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)), if (idx < (int) join->send_group_parts) { copy_fields(&join->tmp_table_param); - copy_funcs(join->tmp_table_param.funcs); + copy_funcs(join->tmp_table_param.items_to_copy); init_sum_functions(join->sum_funcs); if (join->procedure) join->procedure->add(); @@ -7755,7 +7771,7 @@ copy_sum_funcs(Item_sum **func_ptr) { Item_sum *func; for (; (func = *func_ptr) ; func_ptr++) - (void) func->save_in_field(func->result_field, 1); + (void) func->save_in_result_field(1); return; } @@ -7782,12 +7798,11 @@ update_sum_func(Item_sum **func_ptr) /* Copy result of functions to record in tmp_table */ void -copy_funcs(Item_result_field **func_ptr) +copy_funcs(Item **func_ptr) { - Item_result_field *func; + Item *func; for (; (func = *func_ptr) ; func_ptr++) - (void) func->save_in_field(func->result_field, 1); - return; + func->save_in_result_field(1); } diff --git a/sql/sql_select.h b/sql/sql_select.h index 8cdfc8c1062..bb928846186 100644 --- a/sql/sql_select.h +++ b/sql/sql_select.h @@ -124,7 +124,7 @@ class TMP_TABLE_PARAM :public Sql_alloc Copy_field *copy_field, *copy_field_end; Copy_field *save_copy_field, *save_copy_field_end; byte *group_buff; - Item_result_field **funcs; + Item **items_to_copy; /* Fields in tmp table */ MI_COLUMNDEF *recinfo,*start_recinfo; KEY *keyinfo; ha_rows end_write_records; @@ -293,7 +293,7 @@ bool setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param, List<Item> &new_list1, List<Item> &new_list2, uint elements, List<Item> &fields); void copy_fields(TMP_TABLE_PARAM *param); -void copy_funcs(Item_result_field **func_ptr); +void copy_funcs(Item **func_ptr); bool create_myisam_from_heap(THD *thd, TABLE *table, TMP_TABLE_PARAM *param, int error, bool ignore_last_dupp_error); diff --git a/sql/sql_show.cc b/sql/sql_show.cc index 479abf82b91..b084238a3a4 100644 --- a/sql/sql_show.cc +++ b/sql/sql_show.cc @@ -527,6 +527,8 @@ int mysqld_extend_show_tables(THD *thd,const char *db,const char *wild) protocol->store(file_name); table_list.db=(char*) db; table_list.real_name= table_list.alias= file_name; + if (lower_case_table_names) + casedn_str(file_name); if (!(table = open_ltable(thd, &table_list, TL_READ))) { for (uint i=0 ; i < field_list.elements ; i++) diff --git a/sql/sql_table.cc b/sql/sql_table.cc index 931d3ab4512..9738e1dd86d 100644 --- a/sql/sql_table.cc +++ b/sql/sql_table.cc @@ -39,11 +39,28 @@ static int copy_data_between_tables(TABLE *from,TABLE *to, uint order_num, ORDER *order, ha_rows *copied,ha_rows *deleted); -/***************************************************************************** -** Remove all possbile tables and give a compact errormessage for all -** wrong tables. -** This will wait for all users to free the table before dropping it -*****************************************************************************/ +/* + delete (drop) tables. + + SYNOPSIS + mysql_rm_table() + thd Thread handle + tables List of tables to delete + if_exists If 1, don't give error if one table doesn't exists + + NOTES + Will delete all tables that can be deleted and give a compact error + messages for tables that could not be deleted. + If a table is in use, we will wait for all users to free the table + before dropping it + + Wait if global_read_lock (FLUSH TABLES WITH READ LOCK) is set. + + RETURN + 0 ok. In this case ok packet is sent to user + -1 Error (Error message given but not sent to user) + +*/ int mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists, my_bool drop_temporary) @@ -89,6 +106,26 @@ int mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists, DBUG_RETURN(0); } + +/* + delete (drop) tables. + + SYNOPSIS + mysql_rm_table_part2_with_lock() + thd Thread handle + tables List of tables to delete + if_exists If 1, don't give error if one table doesn't exists + dont_log_query Don't write query to log files + + NOTES + Works like documented in mysql_rm_table(), but don't check + global_read_lock and don't send_ok packet to server. + + RETURN + 0 ok + 1 error +*/ + int mysql_rm_table_part2_with_lock(THD *thd, TABLE_LIST *tables, bool if_exists, bool drop_temporary, bool dont_log_query) @@ -111,6 +148,7 @@ int mysql_rm_table_part2_with_lock(THD *thd, return error; } + /* Execute the drop of a normal or temporary table @@ -153,6 +191,7 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists, for (table=tables ; table ; table=table->next) { char *db=table->db ? table->db : thd->db; + mysql_ha_closeall(thd, table, 1); if (!close_temporary_table(thd, db, table->real_name)) { tmp_table_deleted=1; @@ -938,7 +977,7 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info, field=item->tmp_table_field(&tmp_table); else field=create_tmp_field(thd, &tmp_table, item, item->type(), - (Item_result_field***) 0, &tmp_field,0,0); + (Item ***) 0, &tmp_field,0,0); if (!field || !(cr_field=new create_field(field,(item->type() == Item::FIELD_ITEM ? ((Item_field *)item)->field : @@ -1694,6 +1733,8 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name, } send_ok(thd); } + table_list->table=0; // For query cache + query_cache_invalidate3(thd, table_list, 0); DBUG_RETURN(error); } diff --git a/sql/sql_udf.cc b/sql/sql_udf.cc index 3b362bf3e3f..4cecebfa90c 100644 --- a/sql/sql_udf.cc +++ b/sql/sql_udf.cc @@ -147,7 +147,7 @@ void udf_init() tables.lock_type = TL_READ; tables.db=new_thd->db; - if (open_tables(new_thd, &tables)) + if (open_and_lock_tables(new_thd, &tables)) { DBUG_PRINT("error",("Can't open udf table")); sql_print_error("Can't open mysql/func table"); @@ -233,6 +233,11 @@ void udf_free() } hash_free(&udf_hash); free_root(&mem,MYF(0)); + if (initialized) + { + initialized= 0; + pthread_mutex_destroy(&THR_LOCK_udf); + } DBUG_VOID_RETURN; } diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy index e40053f512a..a633c307830 100644 --- a/sql/sql_yacc.yy +++ b/sql/sql_yacc.yy @@ -470,6 +470,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize); %token LINESTRING %token LOCATE %token MAKE_SET_SYM +%token MASTER_POS_WAIT %token MINUTE_SECOND_SYM %token MINUTE_SYM %token MODE_SYM @@ -2241,6 +2242,16 @@ simple_expr: { $$= new Item_func_geometry_from_text($3); } | LINEFROMTEXT '(' expr ',' expr ')' { $$= new Item_func_geometry_from_text($3); } + | MASTER_POS_WAIT '(' expr ',' expr ')' + { + $$= new Item_master_pos_wait($3, $5); + Lex->safe_to_cache_query=0; + } + | MASTER_POS_WAIT '(' expr ',' expr ',' expr ')' + { + $$= new Item_master_pos_wait($3, $5, $7); + Lex->safe_to_cache_query=0; + } | MINUTE_SYM '(' expr ')' { $$= new Item_func_minute($3); } | MOD_SYM '(' expr ',' expr ')' @@ -2864,6 +2875,7 @@ delete_limit_clause: ULONG_NUM: NUM { $$= strtoul($1.str,NULL,10); } + | LONG_NUM { $$= (ulonglong) strtoll($1.str,NULL,10); } | ULONGLONG_NUM { $$= (ulong) strtoull($1.str,NULL,10); } | REAL_NUM { $$= strtoul($1.str,NULL,10); } | FLOAT_NUM { $$= strtoul($1.str,NULL,10); }; @@ -2871,7 +2883,7 @@ ULONG_NUM: ulonglong_num: NUM { $$= (ulonglong) strtoul($1.str,NULL,10); } | ULONGLONG_NUM { $$= strtoull($1.str,NULL,10); } - | LONG_NUM { $$= (ulonglong) strtoul($1.str,NULL,10); } + | LONG_NUM { $$= (ulonglong) strtoll($1.str,NULL,10); } | REAL_NUM { $$= strtoull($1.str,NULL,10); } | FLOAT_NUM { $$= strtoull($1.str,NULL,10); }; @@ -3731,8 +3743,8 @@ param_marker: }; literal: text_literal { $$ = $1; } - | NUM { $$ = new Item_int($1.str, (longlong) atol($1.str),$1.length); } - | LONG_NUM { $$ = new Item_int($1.str); } + | NUM { $$ = new Item_int($1.str, (longlong) strtol($1.str, NULL, 10),$1.length); } + | LONG_NUM { $$ = new Item_int($1.str, (longlong) strtoll($1.str,NULL,10), $1.length); } | ULONGLONG_NUM { $$ = new Item_uint($1.str, $1.length); } | REAL_NUM { $$ = new Item_real($1.str, $1.length); } | FLOAT_NUM { $$ = new Item_float($1.str, $1.length); } diff --git a/sql/table.cc b/sql/table.cc index 57a0831bf2e..051048b72d1 100644 --- a/sql/table.cc +++ b/sql/table.cc @@ -1133,9 +1133,29 @@ char *get_field(MEM_ROOT *mem, TABLE *table, uint fieldnr) return to; } -bool check_db_name(const char *name) + +/* + Check if database name is valid + + SYNPOSIS + check_db_name() + name Name of database + + NOTES + If lower_case_table_names is set then database is converted to lower case + + RETURN + 0 ok + 1 error +*/ + +bool check_db_name(char *name) { - const char *start=name; + char *start=name; + + if (lower_case_table_names) + casedn_str(name); + while (*name) { #if defined(USE_MB) && defined(USE_MB_IDENT) diff --git a/support-files/MacOSX/Description.plist.sh b/support-files/MacOSX/Description.plist.sh new file mode 100644 index 00000000000..4f388235eee --- /dev/null +++ b/support-files/MacOSX/Description.plist.sh @@ -0,0 +1,14 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> +<plist version="1.0"> +<dict> + <key>IFPkgDescriptionDeleteWarning</key> + <string></string> + <key>IFPkgDescriptionDescription</key> + <string>This package provides a binary installation of MySQL @VERSION@@MYSQL_SERVER_SUFFIX@ for Mac OS X.</string> + <key>IFPkgDescriptionTitle</key> + <string>MySQL @VERSION@@MYSQL_SERVER_SUFFIX@ for Mac OS X</string> + <key>IFPkgDescriptionVersion</key> + <string>@VERSION@@MYSQL_SERVER_SUFFIX@</string> + </dict> +</plist> diff --git a/support-files/MacOSX/Info.plist.sh b/support-files/MacOSX/Info.plist.sh new file mode 100644 index 00000000000..c8e4eb1c2d4 --- /dev/null +++ b/support-files/MacOSX/Info.plist.sh @@ -0,0 +1,38 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> +<plist version="1.0"> +<dict> + <key>CFBundleGetInfoString</key> + <string>MySQL @VERSION@@MYSQL_SERVER_SUFFIX@</string> + <key>CFBundleIdentifier</key> + <string>com.mysql.mysql</string> + <key>CFBundleName</key> + <string>MySQL</string> + <key>CFBundleShortVersionString</key> + <string>@VERSION@</string> + <key>IFMajorVersion</key> + <integer>4</integer> + <key>IFMinorVersion</key> + <integer>0</integer> + <key>IFPkgFlagAllowBackRev</key> + <false/> + <key>IFPkgFlagAuthorizationAction</key> + <string>RootAuthorization</string> + <key>IFPkgFlagDefaultLocation</key> + <string>/usr/local</string> + <key>IFPkgFlagInstallFat</key> + <false/> + <key>IFPkgFlagIsRequired</key> + <false/> + <key>IFPkgFlagRelocatable</key> + <false/> + <key>IFPkgFlagRestartAction</key> + <string>NoRestart</string> + <key>IFPkgFlagRootVolumeOnly</key> + <false/> + <key>IFPkgFlagUpdateInstalledLanguages</key> + <false/> + <key>IFPkgFormatVersion</key> + <real>0.10000000149011612</real> +</dict> +</plist> diff --git a/support-files/MacOSX/Makefile.am b/support-files/MacOSX/Makefile.am new file mode 100644 index 00000000000..0702d104e7e --- /dev/null +++ b/support-files/MacOSX/Makefile.am @@ -0,0 +1,37 @@ +# Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Library General Public +# License as published by the Free Software Foundation; either +# version 2 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Library General Public License for more details. +# +# You should have received a copy of the GNU Library General Public +# License along with this library; if not, write to the Free +# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +# MA 02111-1307, USA + +## Process this file with automake to create Makefile.in + +EXTRA_DIST = Info.plist.sh Description.plist.sh + +pkgdata_DATA = Info.plist Description.plist + +CLEANFILES = Info.plist Description.plist + +SUFFIXES = .sh + +.sh: + @RM@ -f $@ $@-t + @SED@ \ + -e 's!@''VERSION''@!@VERSION@!' \ + -e 's!@''MYSQL_SERVER_SUFFIX''@!@MYSQL_SERVER_SUFFIX@!' \ + $< > $@-t + @MV@ $@-t $@ + +# Don't update the files from bitkeeper +%::SCCS/s.% diff --git a/support-files/make_mysql_pkg.pl b/support-files/MacOSX/make_mysql_pkg.pl index 22283d57098..22283d57098 100644 --- a/support-files/make_mysql_pkg.pl +++ b/support-files/MacOSX/make_mysql_pkg.pl diff --git a/support-files/Makefile.am b/support-files/Makefile.am index 00e8b13b12c..4aadd98bd1b 100644 --- a/support-files/Makefile.am +++ b/support-files/Makefile.am @@ -27,6 +27,8 @@ EXTRA_DIST = mysql.spec.sh \ binary-configure.sh \ magic +SUBDIRS = MacOSX + pkgdata_DATA = my-small.cnf \ my-medium.cnf \ my-large.cnf \ diff --git a/support-files/PKG/INSTALL.sh b/support-files/SCO/INSTALL.sh index 979f33f3f06..979f33f3f06 100755 --- a/support-files/PKG/INSTALL.sh +++ b/support-files/SCO/INSTALL.sh diff --git a/support-files/PKG/compile.sh b/support-files/SCO/compile.sh index 5281ccde02d..5281ccde02d 100644 --- a/support-files/PKG/compile.sh +++ b/support-files/SCO/compile.sh diff --git a/support-files/PKG/doc.sh b/support-files/SCO/doc.sh index 9ef17166a6f..9ef17166a6f 100644 --- a/support-files/PKG/doc.sh +++ b/support-files/SCO/doc.sh diff --git a/support-files/PKG/mkpkg.sh b/support-files/SCO/mkpkg.sh index 5a38113138d..5a38113138d 100644 --- a/support-files/PKG/mkpkg.sh +++ b/support-files/SCO/mkpkg.sh diff --git a/support-files/PKG/patch b/support-files/SCO/patch index 373eb8518c6..373eb8518c6 100644 --- a/support-files/PKG/patch +++ b/support-files/SCO/patch diff --git a/support-files/PKG/pkginfo.ini b/support-files/SCO/pkginfo.ini index 13b8b6adb09..13b8b6adb09 100644 --- a/support-files/PKG/pkginfo.ini +++ b/support-files/SCO/pkginfo.ini diff --git a/support-files/PKG/postinstall b/support-files/SCO/postinstall index 2e199b9af82..2e199b9af82 100644 --- a/support-files/PKG/postinstall +++ b/support-files/SCO/postinstall diff --git a/support-files/PKG/preinstall b/support-files/SCO/preinstall index c1175561a99..c1175561a99 100644 --- a/support-files/PKG/preinstall +++ b/support-files/SCO/preinstall diff --git a/support-files/PKG/preremove b/support-files/SCO/preremove index a89648431c1..a89648431c1 100644 --- a/support-files/PKG/preremove +++ b/support-files/SCO/preremove diff --git a/support-files/PKG/prototype.ini b/support-files/SCO/prototype.ini index ca88bb67a90..ca88bb67a90 100644 --- a/support-files/PKG/prototype.ini +++ b/support-files/SCO/prototype.ini diff --git a/support-files/PKG/version b/support-files/SCO/version index f9dc296b71b..f9dc296b71b 100644 --- a/support-files/PKG/version +++ b/support-files/SCO/version diff --git a/support-files/mysql.spec.sh b/support-files/mysql.spec.sh index 978e04e3268..040bbbae306 100644 --- a/support-files/mysql.spec.sh +++ b/support-files/mysql.spec.sh @@ -12,7 +12,7 @@ Summary(pt_BR): MySQL: Um servidor SQL rápido e confiável. Group(pt_BR): Aplicações/Banco_de_Dados Version: @MYSQL_NO_DASH_VERSION@ Release: %{release} -Copyright: GPL / LGPL +Copyright: GPL Source: http://www.mysql.com/Downloads/MySQL-@MYSQL_BASE_VERSION@/mysql-%{mysql_version}.tar.gz Icon: mysql.gif URL: http://www.mysql.com/ @@ -45,6 +45,34 @@ The MySQL web site (http://www.mysql.com/) provides the latest news and information about the MySQL software. Also please see the documentation and the manual for more information. +%package server +Release: %{release} +Summary: MySQL: a very fast and reliable SQL database server +Group: Applications/Databases +Summary(pt_BR): MySQL: Um servidor SQL rápido e confiável. +Group(pt_BR): Aplicações/Banco_de_Dados +Requires: fileutils sh-utils +Provides: msqlormysql mysql-server mysql MySQL +Obsoletes: MySQL mysql mysql-server + +%description server +The MySQL(TM) software delivers a very fast, multi-threaded, multi-user, +and robust SQL (Structured Query Language) database server. MySQL Server +is intended for mission-critical, heavy-load production systems as well +as for embedding into mass-deployed software. MySQL is a trademark of +MySQL AB. + +The MySQL software has Dual Licensing, which means you can use the MySQL +software free of charge under the GNU General Public License +(http://www.gnu.org/licenses/). You can also purchase commercial MySQL +licenses from MySQL AB if you do not wish to be bound by the terms of +the GPL. See the chapter "Licensing and Support" in the manual for +further info. + +The MySQL web site (http://www.mysql.com/) provides the latest +news and information about the MySQL software. Also please see the +documentation and the manual for more information. + This package includes the MySQL server binary (statically linked, compiled with InnoDB support) as well as related utilities to run and administrate a MySQL server. @@ -62,7 +90,7 @@ Obsoletes: mysql-client Provides: mysql-client %description client -This package contains the standard MySQL clients. +This package contains the standard MySQL clients and administration tools. %{see_base} @@ -165,11 +193,9 @@ client/server version. BuildMySQL() { # The --enable-assembler simply does nothing on systems that does not # support assembler speedups. -sh -c "PATH=\"${MYSQL_BUILD_PATH:-/bin:/usr/bin}\" \ - CC=\"${MYSQL_BUILD_CC:-gcc}\" \ - CFLAGS=\"${MYSQL_BUILD_CFLAGS:- -O3}\" \ - CXX=\"${MYSQL_BUILD_CXX:-gcc}\" \ - CXXFLAGS=\"${MYSQL_BUILD_CXXFLAGS:- -O3 \ +sh -c "PATH=\"${MYSQL_BUILD_PATH:-$PATH}\" \ + CFLAGS=\"${MYSQL_BUILD_CFLAGS:-$RPM_OPT_FLAGS}\" \ + CXXFLAGS=\"${MYSQL_BUILD_CXXFLAGS:-$RPM_OPT_FLAGS \ -felide-constructors -fno-exceptions -fno-rtti \ }\" \ ./configure \ @@ -386,7 +412,7 @@ fi %clean [ "$RBR" != "/" ] && [ -d $RBR ] && rm -rf $RBR; -%files +%files server %defattr(755 root, root) %doc %attr(644, root, root) COPYING COPYING.LIB README @@ -440,6 +466,7 @@ fi %attr(755, root, root) /usr/bin/msql2mysql %attr(755, root, root) /usr/bin/mysql %attr(755, root, root) /usr/bin/mysql_find_rows +%attr(755, root, root) /usr/bin/mysql_waitpid %attr(755, root, root) /usr/bin/mysqlaccess %attr(755, root, root) /usr/bin/mysqladmin %attr(755, root, root) /usr/bin/mysqlbinlog @@ -502,6 +529,17 @@ fi %changelog +* Mon Jan 27 2003 Lenz Grimmer <lenz@mysql.com> + +- removed unused CC and CXX variables +- CFLAGS and CXXFLAGS should honor RPM_OPT_FLAGS + +* Fri Jan 24 2003 Lenz Grimmer <lenz@mysql.com> + +- renamed package "MySQL" to "MySQL-server" +- fixed Copyright tag +- added mysql_waitpid to client subpackage (required for mysql-test-run) + * Wed Nov 27 2002 Lenz Grimmer <lenz@mysql.com> - moved init script from /etc/rc.d/init.d to /etc/init.d (the majority of diff --git a/vio/test-ssl.c b/vio/test-ssl.c index acce201bfba..84bae5fa0c7 100644 --- a/vio/test-ssl.c +++ b/vio/test-ssl.c @@ -22,9 +22,6 @@ #include "mysql.h" #include "errmsg.h" #include <my_dir.h> -#ifndef __GNU_LIBRARY__ -#define __GNU_LIBRARY__ // Skip warnings in getopt.h -#endif #include <my_getopt.h> #include <signal.h> #include <violite.h> @@ -50,95 +47,100 @@ print_usage() printf("viossl-test server-key server-cert client-key client-cert [CAfile] [CApath]\n"); } + int -main( int argc, - char** argv) +main(int argc, char** argv) { - char* server_key = 0, *server_cert = 0; - char* client_key = 0, *client_cert = 0; - char* ca_file = 0, *ca_path = 0; - char* cipher=0; - int child_pid,sv[2]; - my_bool unused; - struct st_VioSSLAcceptorFd* ssl_acceptor=0; - struct st_VioSSLConnectorFd* ssl_connector=0; - Vio* client_vio=0, *server_vio=0; - MY_INIT(argv[0]); - DBUG_PROCESS(argv[0]); - DBUG_PUSH(default_dbug_option); - - if (argc<5) - { - print_usage(); - return 1; - } - - server_key = argv[1]; - server_cert = argv[2]; - client_key = argv[3]; - client_cert = argv[4]; - if (argc>5) - ca_file = argv[5]; - if (argc>6) - ca_path = argv[6]; - printf("Server key/cert : %s/%s\n", server_key, server_cert); - printf("Client key/cert : %s/%s\n", client_key, client_cert); - if (ca_file!=0) - printf("CAfile : %s\n", ca_file); - if (ca_path!=0) - printf("CApath : %s\n", ca_path); - - - if (socketpair(PF_UNIX, SOCK_STREAM, IPPROTO_IP, sv)==-1) - fatal_error("socketpair"); - - ssl_acceptor = new_VioSSLAcceptorFd(server_key, server_cert, ca_file, ca_path, cipher); - ssl_connector = new_VioSSLConnectorFd(client_key, client_cert, ca_file, ca_path, cipher); - - client_vio = (struct st_vio*)my_malloc(sizeof(struct st_vio),MYF(0)); - client_vio->sd = sv[0]; - client_vio->vioblocking(client_vio, 0, &unused); - sslconnect(ssl_connector,client_vio,60L); - server_vio = (struct st_vio*)my_malloc(sizeof(struct st_vio),MYF(0)); - server_vio->sd = sv[1]; - server_vio->vioblocking(client_vio, 0, &unused); - sslaccept(ssl_acceptor,server_vio,60L); - - printf("Socketpair: %d , %d\n", client_vio->sd, server_vio->sd); - - child_pid = fork(); - if (child_pid==-1) { - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - fatal_error("fork"); - } - if (child_pid==0) { - //child, therefore, client - char xbuf[100]; - int r = client_vio->read(client_vio,xbuf, sizeof(xbuf)); - if (r<=0) { - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - fatal_error("client:SSL_read"); - } - xbuf[r] = 0; - printf("client:got %s\n", xbuf); - my_free((gptr)client_vio,MYF(0)); - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - } else { - const char* s = "Huhuhuh"; - int r = server_vio->write(server_vio,(gptr)s, strlen(s)); - if (r<=0) { - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - fatal_error("server:SSL_write"); - } - my_free((gptr)server_vio,MYF(0)); - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - } - return 0; + char* server_key = 0, *server_cert = 0; + char* client_key = 0, *client_cert = 0; + char* ca_file = 0, *ca_path = 0; + char* cipher=0; + int child_pid,sv[2]; + my_bool unused; + struct st_VioSSLAcceptorFd* ssl_acceptor=0; + struct st_VioSSLConnectorFd* ssl_connector=0; + Vio* client_vio=0, *server_vio=0; + MY_INIT(argv[0]); + DBUG_PROCESS(argv[0]); + DBUG_PUSH(default_dbug_option); + + if (argc<5) + { + print_usage(); + return 1; + } + + server_key = argv[1]; + server_cert = argv[2]; + client_key = argv[3]; + client_cert = argv[4]; + if (argc>5) + ca_file = argv[5]; + if (argc>6) + ca_path = argv[6]; + printf("Server key/cert : %s/%s\n", server_key, server_cert); + printf("Client key/cert : %s/%s\n", client_key, client_cert); + if (ca_file!=0) + printf("CAfile : %s\n", ca_file); + if (ca_path!=0) + printf("CApath : %s\n", ca_path); + + + if (socketpair(PF_UNIX, SOCK_STREAM, IPPROTO_IP, sv)==-1) + fatal_error("socketpair"); + + ssl_acceptor = new_VioSSLAcceptorFd(server_key, server_cert, ca_file, + ca_path, cipher); + ssl_connector = new_VioSSLConnectorFd(client_key, client_cert, ca_file, + ca_path, cipher); + + client_vio = (struct st_vio*)my_malloc(sizeof(struct st_vio),MYF(0)); + client_vio->sd = sv[0]; + client_vio->vioblocking(client_vio, 0, &unused); + sslconnect(ssl_connector,client_vio,60L); + server_vio = (struct st_vio*)my_malloc(sizeof(struct st_vio),MYF(0)); + server_vio->sd = sv[1]; + server_vio->vioblocking(client_vio, 0, &unused); + sslaccept(ssl_acceptor,server_vio,60L); + + printf("Socketpair: %d , %d\n", client_vio->sd, server_vio->sd); + + child_pid = fork(); + if (child_pid==-1) { + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + fatal_error("fork"); + } + if (child_pid==0) + { + /* child, therefore, client */ + char xbuf[100]; + int r = client_vio->read(client_vio,xbuf, sizeof(xbuf)); + if (r<=0) { + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + fatal_error("client:SSL_read"); + } + xbuf[r] = 0; + printf("client:got %s\n", xbuf); + my_free((gptr)client_vio,MYF(0)); + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + } + else + { + const char* s = "Huhuhuh"; + int r = server_vio->write(server_vio,(gptr)s, strlen(s)); + if (r<=0) { + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + fatal_error("server:SSL_write"); + } + my_free((gptr)server_vio,MYF(0)); + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + } + return 0; } #else /* HAVE_OPENSSL */ diff --git a/vio/test-sslclient.c b/vio/test-sslclient.c index 84853e45485..231ce056d8c 100644 --- a/vio/test-sslclient.c +++ b/vio/test-sslclient.c @@ -22,9 +22,6 @@ #include "mysql.h" #include "errmsg.h" #include <my_dir.h> -#ifndef __GNU_LIBRARY__ -#define __GNU_LIBRARY__ // Skip warnings in getopt.h -#endif #include <my_getopt.h> #include <signal.h> #include <violite.h> diff --git a/vio/test-sslserver.c b/vio/test-sslserver.c index f0116a2817d..71b194838c7 100644 --- a/vio/test-sslserver.c +++ b/vio/test-sslserver.c @@ -22,9 +22,6 @@ #include "mysql.h" #include "errmsg.h" #include <my_dir.h> -#ifndef __GNU_LIBRARY__ -#define __GNU_LIBRARY__ // Skip warnings in getopt.h -#endif #include <my_getopt.h> #include <signal.h> #include <violite.h> diff --git a/vio/viotest-ssl.c b/vio/viotest-ssl.c index 1a766a3fc97..b4a191a1e2f 100644 --- a/vio/viotest-ssl.c +++ b/vio/viotest-ssl.c @@ -22,11 +22,7 @@ #include "mysql.h" #include "errmsg.h" #include <my_dir.h> -#ifndef __GNU_LIBRARY__ -#define __GNU_LIBRARY__ // Skip warnings in getopt.h -#endif #include <my_getopt.h> -//#include "my_readline.h" #include <signal.h> #include <violite.h> @@ -38,115 +34,115 @@ const char *default_dbug_option="d:t:O,/tmp/viotest-ssl.trace"; #endif void -fatal_error( const char* r) +fatal_error(const char *r) { - perror(r); - exit(0); + perror(r); + exit(0); } void print_usage() { - printf("viossl-test: testing SSL virtual IO. Usage:\n"); - printf("viossl-test server-key server-cert client-key client-cert [CAfile] [CApath]\n"); + printf("viossl-test: testing SSL virtual IO. Usage:\n"); + printf("viossl-test server-key server-cert client-key client-cert [CAfile] [CApath]\n"); } -int -main( int argc, - char** argv) + +int main(int argc, char **argv) { - char* server_key = 0; - char* server_cert = 0; - char* client_key = 0; - char* client_cert = 0; - char* ca_file = 0; - char* ca_path = 0; - int child_pid,sv[2]; - struct st_VioSSLAcceptorFd* ssl_acceptor=0; - struct st_VioSSLConnectorFd* ssl_connector=0; - Vio* client_vio=0; - Vio* server_vio=0; - MY_INIT(argv[0]); -// DBUG_ENTER("main"); - DBUG_PROCESS(argv[0]); - DBUG_PUSH(default_dbug_option); - - - - if (argc<5) - { - print_usage(); - return 1; - } - - server_key = argv[1]; - server_cert = argv[2]; - client_key = argv[3]; - client_cert = argv[4]; - if (argc>5) - ca_file = argv[5]; - if (argc>6) - ca_path = argv[6]; - printf("Server key/cert : %s/%s\n", server_key, server_cert); - printf("Client key/cert : %s/%s\n", client_key, client_cert); - if (ca_file!=0) - printf("CAfile : %s\n", ca_file); - if (ca_path!=0) - printf("CApath : %s\n", ca_path); - - - if (socketpair(PF_UNIX, SOCK_STREAM, IPPROTO_IP, sv)==-1) - fatal_error("socketpair"); - - ssl_acceptor = new_VioSSLAcceptorFd(server_key, server_cert, ca_file, ca_path); - ssl_connector = new_VioSSLConnectorFd(client_key, client_cert, ca_file, ca_path); - - client_vio = (Vio*)my_malloc(sizeof(struct st_vio),MYF(0)); - client_vio->sd = sv[0]; - sslconnect(ssl_connector,client_vio); - server_vio = (Vio*)my_malloc(sizeof(struct st_vio),MYF(0)); - server_vio->sd = sv[1]; - sslaccept(ssl_acceptor,server_vio); - - printf("Socketpair: %d , %d\n", client_vio->sd, server_vio->sd); - - child_pid = fork(); - if (child_pid==-1) { - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - fatal_error("fork"); - } - if (child_pid==0) { - //child, therefore, client - char xbuf[100]; - int r = vio_ssl_read(client_vio,xbuf, sizeof(xbuf)); - if (r<=0) { - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - fatal_error("client:SSL_read"); - } -// printf("*** client cipher %s\n",client_vio->cipher_description()); - xbuf[r] = 0; - printf("client:got %s\n", xbuf); - my_free((gptr)client_vio,MYF(0)); - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - sleep(1); - } else { - const char* s = "Huhuhuh"; - int r = vio_ssl_write(server_vio,(gptr)s, strlen(s)); - if (r<=0) { - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - fatal_error("server:SSL_write"); - } -// printf("*** server cipher %s\n",server_vio->cipher_description()); - my_free((gptr)server_vio,MYF(0)); - my_free((gptr)ssl_acceptor,MYF(0)); - my_free((gptr)ssl_connector,MYF(0)); - sleep(1); - } - return 0; + char* server_key = 0; + char* server_cert = 0; + char* client_key = 0; + char* client_cert = 0; + char* ca_file = 0; + char* ca_path = 0; + int child_pid,sv[2]; + struct st_VioSSLAcceptorFd* ssl_acceptor=0; + struct st_VioSSLConnectorFd* ssl_connector=0; + Vio* client_vio=0; + Vio* server_vio=0; + MY_INIT(argv[0]); + DBUG_PROCESS(argv[0]); + DBUG_PUSH(default_dbug_option); + + if (argc<5) + { + print_usage(); + return 1; + } + + server_key = argv[1]; + server_cert = argv[2]; + client_key = argv[3]; + client_cert = argv[4]; + if (argc>5) + ca_file = argv[5]; + if (argc>6) + ca_path = argv[6]; + printf("Server key/cert : %s/%s\n", server_key, server_cert); + printf("Client key/cert : %s/%s\n", client_key, client_cert); + if (ca_file!=0) + printf("CAfile : %s\n", ca_file); + if (ca_path!=0) + printf("CApath : %s\n", ca_path); + + + if (socketpair(PF_UNIX, SOCK_STREAM, IPPROTO_IP, sv)==-1) + fatal_error("socketpair"); + + ssl_acceptor = new_VioSSLAcceptorFd(server_key, server_cert, ca_file, + ca_path); + ssl_connector = new_VioSSLConnectorFd(client_key, client_cert, ca_file, + ca_path); + + client_vio = (Vio*)my_malloc(sizeof(struct st_vio),MYF(0)); + client_vio->sd = sv[0]; + sslconnect(ssl_connector,client_vio); + server_vio = (Vio*)my_malloc(sizeof(struct st_vio),MYF(0)); + server_vio->sd = sv[1]; + sslaccept(ssl_acceptor,server_vio); + + printf("Socketpair: %d , %d\n", client_vio->sd, server_vio->sd); + + child_pid = fork(); + if (child_pid==-1) + { + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + fatal_error("fork"); + } + if (child_pid==0) + { + /* child, therefore, client */ + char xbuf[100]; + int r = vio_ssl_read(client_vio,xbuf, sizeof(xbuf)); + if (r<=0) { + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + fatal_error("client:SSL_read"); + } + xbuf[r] = 0; + printf("client:got %s\n", xbuf); + my_free((gptr)client_vio,MYF(0)); + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + sleep(1); + } + else + { + const char* s = "Huhuhuh"; + int r = vio_ssl_write(server_vio,(gptr)s, strlen(s)); + if (r<=0) { + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + fatal_error("server:SSL_write"); + } + my_free((gptr)server_vio,MYF(0)); + my_free((gptr)ssl_acceptor,MYF(0)); + my_free((gptr)ssl_connector,MYF(0)); + sleep(1); + } + return 0; } #else /* HAVE_OPENSSL */ |