1<!--$Id: db_config.so,v 10.4 2007/09/26 15:11:31 bostic Exp $--> 2<!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> 3<!--See the file LICENSE for redistribution information.--> 4<html> 5<head> 6<title>Berkeley DB Reference Guide: DB_CONFIG configuration file</title> 7<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> 8<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> 9</head> 10<body bgcolor=white> 11<a name="2"><!--meow--></a><a name="3"><!--meow--></a> 12<table width="100%"><tr valign=top> 13<td><b><dl><dt>Berkeley DB Reference Guide:<dd>Environment</dl></b></td> 14<td align=right><a href="/env/error.html"><img src="/images/prev.gif" alt="Prev"></a><a href="/toc.html"><img src="/images/ref.gif" alt="Ref"></a><a href="/env/naming.html"><img src="/images/next.gif" alt="Next"></a> 15</td></tr></table> 16<p align=center><b>DB_CONFIG configuration file</b></p> 17<a name="4"><!--meow--></a> 18<p>Almost all of the configuration information that can be specified to 19<a href="/api_c/env_class.html">DB_ENV</a> methods can also be specified using a configuration file. 20If a file named DB_CONFIG exists in the database home directory, 21it will be read for lines of the format <b>NAME VALUE</b>.</p> 22<p>One or more whitespace characters are used to delimit the two parts of 23the line, and trailing whitespace characters are discarded. All empty 24lines or lines whose first character is a whitespace or hash 25(<b>#</b>) character will be ignored. Each line must specify both 26the NAME and the VALUE of the pair. The specific NAME VALUE pairs are 27documented in the manual for the corresponding methods (for example, 28the <a href="/api_c/env_set_data_dir.html">DB_ENV->set_data_dir</a> documentation includes NAME VALUE pair 29information Berkeley DB administrators can use to configure locations for 30database files).</p> 31<p>The DB_CONFIG configuration file is intended to allow database 32environment administrators to customize environments independent of 33applications using the environment. For example, a database 34administrator can move the database log and data files to a different 35location without application recompilation. In addition, because the 36DB_CONFIG file is read when the database environment is opened, 37it can be used to overrule application configuration done before that 38time. For example a database administrator could override the 39compiled-in application cache size to a size more appropriate for a 40specific machine.</p> 41<table width="100%"><tr><td><br></td><td align=right><a href="/env/error.html"><img src="/images/prev.gif" alt="Prev"></a><a href="/toc.html"><img src="/images/ref.gif" alt="Ref"></a><a href="/env/naming.html"><img src="/images/next.gif" alt="Next"></a> 42</td></tr></table> 43<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> 44</body> 45</html> 46
