<!--$Id: log_file.so,v 10.32 2003/11/08 19:17:36 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv::log_file</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 width="100%"><tr valign=top> <td> <h3>DbEnv::log_file</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db_cxx.h> <p> int DbEnv::log_file(const DbLsn *lsn, char *namep, size_t len); </pre></h3> <hr size=1 noshade> <h3>Description: DbEnv::log_file</h3> <p>The DbEnv::log_file method maps <a href="../../db42-devel-4.2.52/api_cxx/lsn_class.html">DbLsn</a> objects to filenames, returning the name of the file containing the record named by <b>lsn</b>.</p> <p>This mapping of <a href="../../db42-devel-4.2.52/api_cxx/lsn_class.html">DbLsn</a> objects to files is needed for database administration. For example, a transaction manager typically records the earliest <a href="../../db42-devel-4.2.52/api_cxx/lsn_class.html">DbLsn</a> needed for restart, and the database administrator may want to archive log files to tape when they contain only <a href="../../db42-devel-4.2.52/api_cxx/lsn_class.html">DbLsn</a> entries before the earliest one needed for restart.</p> <p>The DbEnv::log_file 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> <h3>Parameters</h3> <p><dl compact> <p><dt><b>lsn</b><dd> The <b>lsn</b> parameter is the <a href="../../db42-devel-4.2.52/api_cxx/lsn_class.html">DbLsn</a> object for which a filename is wanted. <p><dt><b>namep</b><dd> The <b>namep</b> parameter references memory into which the name of the file containing the record named by <b>lsn</b> is copied. <p><dt><b>len</b><dd> The <b>len</b> parameter is the length of the <b>namep</b> buffer in bytes. If <b>namep</b> is too short to hold the filename, DbEnv::log_file will fail. (Log filenames are normally quite short, on the order of 10 characters.) </dl> <h3>Errors</h3> <p>If the supplied buffer was too small to hold the log filename, the DbEnv::log_file method will fail and either return ENOMEM or throw a <a href="../../db42-devel-4.2.52/api_cxx/memp_class.html">DbMemoryException</a> exception.</p> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_cxx/env_class.html">DbEnv</a>, <a href="../../db42-devel-4.2.52/api_cxx/logc_class.html">DbLogc</a>, <a href="../../db42-devel-4.2.52/api_cxx/lsn_class.html">DbLsn</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_cxx/log_list.html">Logging Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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