2011-09-13 17:44:24 +00:00
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<title>DB_CONFIG configuration file</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="env.html" title="Chapter 9. The Berkeley DB Environment" />
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<link rel="prev" href="env_error.html" title="Error support" />
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<link rel="next" href="env_naming.html" title="File naming" />
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<div class="libver">
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DB_CONFIG configuration file</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="env_error.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 9.
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The Berkeley DB Environment
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="env_naming.html">Next</a></td>
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="env_db_config"></a>DB_CONFIG configuration file</h2>
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</div>
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</div>
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</div>
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<p>
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Almost all of the configuration information that can be specified to
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<a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> methods can also be specified using a configuration file.
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If a file named DB_CONFIG exists in the database home directory, it
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will be read for lines of the format
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<span class="bold"><strong>NAME VALUE</strong></span>.
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</p>
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<p>
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One or more whitespace characters are used to delimit the two parts of
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the line, and trailing whitespace characters are discarded. All empty
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lines or lines whose first character is a whitespace or hash
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(<span class="bold"><strong>#</strong></span>) character will be ignored. Each
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line must specify both the NAME and the VALUE of the pair. The
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specific NAME VALUE pairs are documented in the manual for the
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corresponding methods (for example, the <a href="../api_reference/C/envset_data_dir.html" class="olink">DB_ENV->set_data_dir()</a> documentation
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includes NAME VALUE pair information Berkeley DB administrators can use
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to configure locations for database files).
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</p>
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<p><a id="env_db_config.DB_CONFIG"></a>
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The DB_CONFIG configuration file is intended to allow database
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environment administrators to customize environments independent of
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applications using the environment. For example, a database
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administrator can move the database log and data files to a different
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location without application recompilation. In addition, because the
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DB_CONFIG file is read when the database environment is opened, it can
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be used to overrule application configuration done before that time.
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For example a database administrator could override the compiled-in
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application cache size to a size more appropriate for a specific
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machine.
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</p>
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<td width="40%" align="left"><a accesskey="p" href="env_error.html">Prev</a> </td>
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<a accesskey="u" href="env.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="env_naming.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Error support </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> File naming</td>
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</tr>
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