<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>DbMpoolFile::set_lsn_offset()</title> <link rel="stylesheet" href="apiReference.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB C++ API Reference" /> <link rel="up" href="memp.html" title="Chapter 9. The DbMpoolFile Handle" /> <link rel="prev" href="mempset_ftype.html" title="DbMpoolFile::set_ftype()" /> <link rel="next" href="mempset_maxsize.html" title="DbMpoolFile::set_maxsize()" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DbMpoolFile::set_lsn_offset()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="mempset_ftype.html">Prev</a> </td> <th width="60%" align="center">Chapter 9. The DbMpoolFile Handle </th> <td width="20%" align="right"> <a accesskey="n" href="mempset_maxsize.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="mempset_lsn_offset"></a>DbMpoolFile::set_lsn_offset()</h2> </div> </div> </div> <pre class="programlisting">#include <db_cxx.h> int DbMpoolFile::set_lsn_offset(int32_t lsn_offset); </pre> <p> The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method specifies the zero-based byte offset of a log sequence number (<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>) on the file's pages, for the purposes of page-flushing as part of transaction checkpoint. (See the <a class="xref" href="mempsync.html" title="DbEnv::memp_sync()">DbEnv::memp_sync()</a> documentation for more information.) </p> <p> The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method configures a file in the cache, not only operations performed using the specified <a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a> handle. </p> <p> The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method may not be called after the <a class="xref" href="mempfopen.html" title="DbMpoolFile::open()">DbMpoolFile::open()</a> method is called. If the file is already open in the cache when <a class="xref" href="mempfopen.html" title="DbMpoolFile::open()">DbMpoolFile::open()</a> is called, the information specified to <code class="methodname">DbMpoolFile::set_lsn_offset()</code> must be consistent with the existing file or an error will be returned. </p> <p> The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> <span> <span> 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. </span> </span> </p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp9077312"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp9076664"></a>lsn_offset</h4> </div> </div> </div> <p> The <span class="bold"><strong>lsn_offset</strong></span> parameter is the zero-based byte offset of the log sequence number on the file's pages. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp9052104"></a>Class</h3> </div> </div> </div> <p> <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>, <a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp9062832"></a>See Also</h3> </div> </div> </div> <p> <a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="mempset_ftype.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="memp.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="mempset_maxsize.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DbMpoolFile::set_ftype() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DbMpoolFile::set_maxsize()</td> </tr> </table> </div> </body> </html>