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diff --git a/bdb/docs/ref/env/intro.html b/bdb/docs/ref/env/intro.html new file mode 100644 index 00000000000..a555c2f0f9e --- /dev/null +++ b/bdb/docs/ref/env/intro.html @@ -0,0 +1,56 @@ +<!--$Id: intro.so,v 10.25 2000/03/18 21:43:12 bostic Exp $--> +<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.--> +<!--All rights reserved.--> +<html> +<head> +<title>Berkeley DB Reference Guide: Introduction</title> +<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> +<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> +</head> +<body bgcolor=white> +<table><tr valign=top> +<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Environment</dl></h3></td> +<td width="1%"><a href="../../ref/arch/utilities.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/env/create.html"><img src="../../images/next.gif" alt="Next"></a> +</td></tr></table> +<p> +<h1 align=center>Introduction</h1> +<p>A Berkeley DB environment is an encapsulation of one or more databases, log +files and shared information about the database environment such as shared +memory buffer cache pages. +<p>The simplest way to administer a Berkeley DB application environment is to +create a single <b>home</b> directory that stores the files for the +applications that will share the environment. The environment home +directory must be created before any Berkeley DB applications are run. Berkeley DB +itself never creates the environment home directory. The environment can +then be identified by the name of that directory. +<p>An environment may be shared by any number of applications as well as by +any number of threads within the applications. It is possible for an +environment to include resources from other directories on the system, +and applications often choose to distribute resources to other directories +or disks for performance or other reasons. However, by default, the +databases, shared regions (the locking, logging, memory pool, and +transaction shared memory areas) and log files will be stored in a single +directory hierarchy. +<p>It is important to realize that all applications sharing a database +environment implicitly trust each other. They have access to each other's +data as it resides in the shared regions and they will share resources +such as buffer space and locks. At the same time, any applications using +the same databases <b>must</b> share an environment if consistency is +to be maintained between them. +<p>The Berkeley DB environment is created and described by the <a href="../../api_c/env_create.html">db_env_create</a> +and <a href="../../api_c/env_open.html">DBENV->open</a> interfaces. In situations where customization is +desired, such as storing log files on a separate disk drive, applications +must describe the customization by either creating an environment +configuration file in the environment home directory or by arguments +passed to the <a href="../../api_c/env_open.html">DBENV->open</a> interface. See the documentation on that +function for details on this procedure. +<p>Once an environment has been created, database files specified using +relative pathnames will be named relative to the home directory. Using +pathnames relative to the home directory allows the entire environment +to be easily moved to facilitate restoring and recovering a database in +a different directory or on a different system. +<table><tr><td><br></td><td width="1%"><a href="../../ref/arch/utilities.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/env/create.html"><img src="../../images/next.gif" alt="Next"></a> +</td></tr></table> +<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> +</body> +</html> |