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<!--Id: db_config.so,v 10.1 2002/09/03 20:09:29 bostic Exp -->
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<title>Berkeley DB Reference Guide: DB_CONFIG configuration file</title>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Environment</dl></h3></td>
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<h1 align=center>DB_CONFIG configuration file</h1>
<p>Most of the configuration information that can be specified to
<a href="../../api_c/env_class.html">DB_ENV</a> methods can also be specified using a configuration file.
If an environment home directory has been specified (either by the
application specifying a non-NULL <b>db_home</b> argument to
<a href="../../api_c/env_open.html">DB_ENV->open</a>, or by the application setting the
<a href="../../api_c/env_open.html#DB_USE_ENVIRON">DB_USE_ENVIRON</a> or <a href="../../api_c/env_open.html#DB_USE_ENVIRON_ROOT">DB_USE_ENVIRON_ROOT</a> flags and the
<a href="../../ref/env/naming.html#DB_HOME">DB_HOME</a> environment variable being set), any file named
DB_CONFIG in the database home directory will be read for lines
of the format <b>NAME VALUE</b>.
<p>One or more whitespace characters are used to delimit the two parts of
the line, and trailing whitespace characters are discarded. All empty
lines or lines whose first character is a whitespace or hash
(<b>#</b>) character will be ignored. Each line must specify both
the NAME and the VALUE of the pair. The specific NAME VALUE pairs are
documented in the manual for the corresponding methods (for example,
the <a href="../../api_c/env_set_data_dir.html">DB_ENV->set_data_dir</a> documentation includes NAME VALUE pair
information Berkeley DB administrators can use to configure locations for
database files).
<p>The DB_CONFIG configuration file is intended to allow database
environment administrators to customize environments independent of
applications using the environment. For example, a database
administrator can move the database log and data files to a different
location without application recompilation. In addition, because the
DB_CONFIG file is read when the database environment is opened,
it can be used to overrule application configuration done before that
time. For example a database administrator could override the
compiled-in application cache size to a size more appropriate for a
specific machine.
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