1<!--$Id: env_set_lg_dir.so,v 10.25 2004/09/28 15:04:21 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: DB_ENV->set_lg_dir</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<table width="100%"><tr valign=top> 12<td> 13<b>DB_ENV->set_lg_dir</b> 14</td> 15<td align=right> 16<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a> 17<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td> 18</tr></table> 19<hr size=1 noshade> 20<tt> 21<b><pre> 22#include <db.h> 23<p> 24int 25DB_ENV->set_lg_dir(DB_ENV *dbenv, const char *dir); 26<p> 27int 28DB_ENV->get_lg_dir(DB_ENV *dbenv, const char **dirp); 29</pre></b> 30<hr size=1 noshade> 31<b>Description: DB_ENV->set_lg_dir</b> 32<p>The path of a directory to be used as the location of logging files. 33Log files created by the Log Manager subsystem will be created in this 34directory.</p> 35<p>If no logging directory is specified, log files are created in the 36environment home directory. See <a href="../ref/env/naming.html">Berkeley DB File Naming</a> for more information.</p> 37<p>For the greatest degree of recoverability from system or application 38failure, database files and log files should be located on separate 39physical devices.</p> 40<p>The database environment's logging directory may also be configured using the 41environment's <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file. The syntax of the entry in that 42file is a single line with the string "set_lg_dir", one or more whitespace 43characters, and the directory name. 44Because the <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file is read when the database environment 45is opened, it will silently overrule configuration done before that 46time.</p> 47<p>The DB_ENV->set_lg_dir method configures operations performed using the specified 48<a href="../api_c/env_class.html">DB_ENV</a> handle, not all operations performed on the underlying 49database environment.</p> 50<p>The DB_ENV->set_lg_dir method may not be called after the <a href="../api_c/env_open.html">DB_ENV->open</a> method is 51called. 52If the database environment already exists when 53<a href="../api_c/env_open.html">DB_ENV->open</a> is called, the information specified to DB_ENV->set_lg_dir 54must be consistent with the existing environment or corruption can 55occur.</p> 56<p>The DB_ENV->set_lg_dir method 57returns a non-zero error value on failure 58and 0 on success. 59</p> 60<b>Parameters</b> <br> 61 <b>dir</b><ul compact><li>The <b>dir</b> parameter is the directory used to store the logging files.</ul> 62<p>When using a Unicode build on Windows (the default), the <b>dir</b> 63argument will be interpreted as a UTF-8 string, which is equivalent to 64ASCII for Latin characters.</p> 65<br> 66<br><b>Errors</b> 67<p>The DB_ENV->set_lg_dir method 68may fail and return one of the following non-zero errors:</p> 69<br> 70<b>EINVAL</b><ul compact><li>If the method was called after <a href="../api_c/env_open.html">DB_ENV->open</a> was called; or if an 71invalid flag value or parameter was specified.</ul> 72<br> 73<hr size=1 noshade> 74<b>Description: DB_ENV->get_lg_dir</b> 75<p>The DB_ENV->get_lg_dir method returns the log directory.</p> 76<p>The DB_ENV->get_lg_dir method may be called at any time during the life of the 77application.</p> 78<p>The DB_ENV->get_lg_dir method 79returns a non-zero error value on failure 80and 0 on success. 81</p> 82<b>Parameters</b> <br> 83 <b>dirp</b><ul compact><li>The DB_ENV->get_lg_dir method returns a reference to the 84log directory in <b>dirp</b>.</ul> 85<br> 86<hr size=1 noshade> 87<br><b>Class</b> 88<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/logc_class.html">DB_LOGC</a>, <a href="../api_c/lsn_class.html">DB_LSN</a> 89<br><b>See Also</b> 90<a href="../api_c/log_list.html">Logging Subsystem and Related Methods</a> 91</tt> 92<table width="100%"><tr><td><br></td><td align=right> 93<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a> 94</td></tr></table> 95<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> 96</body> 97</html> 98
