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-<!--$Id-->
-<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
-<!--All rights reserved.-->
-<html>
-<head>
-<title>Berkeley DB: DbEnv::set_flags</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>
- <a name="2"><!--meow--></a>
-<table><tr valign=top>
-<td>
-<h1>DbEnv::set_flags</h1>
-</td>
-<td width="1%">
-<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
-</td></tr></table>
-<hr size=1 noshade>
-<tt>
-<h3><pre>
-#include &lt;db_cxx.h&gt;
-<p>
-int
-DbEnv::set_flags(u_int32_t flags, int onoff);
-</pre></h3>
-<h1>Description</h1>
-<p>The <b>flags</b> value must be set to 0 or by bitwise inclusively <b>OR</b>'ing together one or more
-of the following values.
-If <b>onoff</b> is zero, the specified flags are cleared, otherwise they
-are set.
-<p><dl compact>
-<p><dt><a name="DB_CDB_ALLDB">DB_CDB_ALLDB</a><dd>For Berkeley DB Concurrent Data Store applications, perform locking on an environment-wide basis
-rather than per-database. This flag may only be used to configure Berkeley DB
-before the <a href="../api_cxx/env_open.html">DbEnv::open</a> interface is called.
-<p><dt><a name="DB_NOMMAP">DB_NOMMAP</a><dd>Copy read-only database files in this environment into the local cache
-instead of potentially mapping them into process memory (see the
-description of the <a href="../api_cxx/env_set_mp_mmapsize.html">DbEnv::set_mp_mmapsize</a> method for further information).
-<p><dt><a name="DB_TXN_NOSYNC">DB_TXN_NOSYNC</a><dd>Do not synchronously flush the log on transaction commit or prepare.
-This means that transactions exhibit the ACI (atomicity, consistency and
-isolation) properties, but not D (durability), i.e., database integrity
-will be maintained but it is possible that some number of the most
-recently committed transactions may be undone during recovery instead of
-being redone.
-<p>The number of transactions that are potentially at risk is governed by
-how often the log is checkpointed (see <a href="../utility/db_checkpoint.html">db_checkpoint</a> for more
-information) and how many log updates can fit on a single log page.
-</dl>
-<p>The DbEnv::set_flags method either returns a non-zero error value or throws an exception that
-encapsulates a non-zero error value on failure, and returns 0 on success.
-<p>The database environment's flag values may also be set using the environment's
-<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
-single line with the string "set_flags", one or more whitespace characters,
-and the interface flag argument as a string, for example, "set_flags
-DB_TXN_NOSYNC". Because the <b>DB_CONFIG</b> file is read when the database
-environment is opened, it will silently overrule configuration done
-before that time.
-<h1>Errors</h1>
-<p><dl compact>
-<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
-</dl>
-<h3>Class</h3>
-<a href="../api_cxx/dbenv_class.html">DbEnv</a>
-<h1>See Also</h1>
-<a href="../api_cxx/env_close.html">DbEnv::close</a>,
-<a href="../api_cxx/env_open.html">DbEnv::open</a>,
-<a href="../api_cxx/env_remove.html">DbEnv::remove</a>,
-<a href="../api_cxx/db_err.html">DbEnv::err</a>,
-<a href="../api_cxx/env_strerror.html">DbEnv::strerror</a>,
-<a href="../api_cxx/env_version.html">DbEnv::version</a>,
-<a href="../api_cxx/env_set_cachesize.html">DbEnv::set_cachesize</a>,
-<a href="../api_cxx/env_set_errcall.html">DbEnv::set_errcall</a>,
-<a href="../api_cxx/env_set_errfile.html">DbEnv::set_errfile</a>,
-<a href="../api_cxx/env_set_error_stream.html">DbEnv::set_error_stream</a>,
-<a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a>,
-<a href="../api_cxx/env_set_flags.html">DbEnv::set_flags</a>,
-<a href="../api_cxx/env_set_mutexlocks.html">DbEnv::set_mutexlocks</a>,
-<a href="../api_cxx/env_set_paniccall.html">DbEnv::set_paniccall</a>,
-and
-<a href="../api_cxx/env_set_verbose.html">DbEnv::set_verbose</a>.
-</tt>
-<table><tr><td><br></td><td width="1%">
-<a href="../api_cxx/cxx_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
-</td></tr></table>
-<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
-</body>
-</html>