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//usr/share/doc/db4-devel-4.7.25/api_c/memp_set_lsn_offset.html
<!--$Id: memp_set_lsn_offset.so,v 10.17 2005/04/14 17:57:54 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. 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,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>DB_MPOOLFILE->set_lsn_offset</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a> <a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db.h> <p> int DB_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset); <p> int DB_MPOOLFILE->get_lsn_offset(DB_MPOOLFILE *mpf, int32_t *lsn_offsetp); </pre></b> <hr size=1 noshade> <b>Description: DB_MPOOLFILE->set_lsn_offset</b> <p>The DB_MPOOLFILE->set_lsn_offset method specifies the zero-based byte offset of a log sequence number (<a href="../../db4-devel-4.7.25/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-4.7.25/api_c/memp_sync.html">DB_ENV->memp_sync</a> documentation for more information.)</p> <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-4.7.25/api_c/mempfile_class.html">DB_MPOOLFILE</a> handle.</p> <p>The DB_MPOOLFILE->set_lsn_offset method may not be called after the <a href="../../db4-devel-4.7.25/api_c/memp_fopen.html">DB_MPOOLFILE->open</a> method is called. If the file is already open in the memory pool when <a href="../../db4-devel-4.7.25/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> <p>The DB_MPOOLFILE->set_lsn_offset method returns a non-zero error value on failure and 0 on success. </p> <b>Parameters</b> <br> <b>lsn_offset</b><ul compact><li>The <b>lsn_offset</b> parameter is the zero-based byte offset of the log sequence number on the file's pages.</ul> <br> <hr size=1 noshade> <b>Description: DB_MPOOLFILE->get_lsn_offset</b> <p>The DB_MPOOLFILE->get_lsn_offset method returns the log sequence number byte offset.</p> <p>The DB_MPOOLFILE->get_lsn_offset method may be called at any time during the life of the application.</p> <p>The DB_MPOOLFILE->get_lsn_offset method returns a non-zero error value on failure and 0 on success. </p> <b>Parameters</b> <br> <b>lsn_offsetp</b><ul compact><li>The DB_MPOOLFILE->get_lsn_offset method returns the log sequence number byte offset in <b>lsn_offsetp</b>.</ul> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a>, <a href="../../db4-devel-4.7.25/api_c/mempfile_class.html">DB_MPOOLFILE</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/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-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a><a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
