<!--$Id: memp_set_lsn_offset.so,v 10.6 2002/08/24 18:23:33 bostic Exp $--> <!--Copyright 1997-2002 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_MPOOLFILE->set_lsn_offset</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> <h1>DB_MPOOLFILE->set_lsn_offset</h1> </td> <td align=right> <a href="../../db4-devel-4.1.25/api_c/c_index.html"><img src="../../db4-4.1.25/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.1.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db.h> <p> int DB_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset); </pre></h3> <h1>Description</h1> <p>The DB_MPOOLFILE->set_lsn_offset method specifies the zero-based byte offset of a log sequence number (<a href="../../db4-devel-4.1.25/api_c/lsn_class.html">DB_LSN</a>) on the file's pages, for the purposes of page-flushing as part of transaction checkpoint. (See the <a href="../../db4-devel-4.1.25/api_c/memp_sync.html">DB_ENV->memp_sync</a> documentation for more information.) <p>The DB_MPOOLFILE->set_lsn_offset method configures a file in the memory pool, not only operations performed using the specified <a href="../../db4-devel-4.1.25/api_c/mempfile_class.html">DB_MPOOLFILE</a> handle. <p>The DB_MPOOLFILE->set_lsn_offset interface may not be called after the <a href="../../db4-devel-4.1.25/api_c/memp_fopen.html">DB_MPOOLFILE->open</a> interface is called. If the file is already open in the memory pool when <a href="../../db4-devel-4.1.25/api_c/memp_fopen.html">DB_MPOOLFILE->open</a> is called, the information specified to DB_MPOOLFILE->set_lsn_offset must be consistent with the existing file or an error will be returned. <p>The DB_MPOOLFILE->set_lsn_offset method returns a non-zero error value on failure and 0 on success. <h1>Errors</h1> <p>The DB_MPOOLFILE->set_lsn_offset method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_MPOOLFILE->set_lsn_offset method may fail and return <a href="../../db4-devel-4.1.25/ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail in the same way. <h1>Class</h1> <a href="../../db4-devel-4.1.25/api_c/env_class.html">DB_ENV</a>, <a href="../../db4-devel-4.1.25/api_c/mempfile_class.html">DB_MPOOLFILE</a> <h1>See Also</h1> <a href="../../db4-devel-4.1.25/api_c/memp_list.html">Memory Pools and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.1.25/api_c/c_index.html"><img src="../../db4-4.1.25/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.1.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> </body> </html>