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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DbMpoolFile::set_lsn_offset()</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="memp.html" title="Chapter 9. The DbMpoolFile Handle" />
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<link rel="prev" href="mempset_ftype.html" title="DbMpoolFile::set_ftype()" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DbMpoolFile::set_lsn_offset()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="mempset_ftype.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 9.
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The DbMpoolFile Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="mempset_maxsize.html">Next</a></td>
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<h2 class="title" style="clear: both"><a id="mempset_lsn_offset"></a>DbMpoolFile::set_lsn_offset()</h2>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int DbMpoolFile::set_lsn_offset(int32_t lsn_offset); </pre>
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<p>
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The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method specifies the zero-based
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byte offset of a log sequence number
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(<a class="link" href="lsn.html" title="Chapter 8. The DbLsn Handle">DbLsn</a>) on the file's pages, for
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the purposes of page-flushing as part of transaction checkpoint. (See
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the <a class="xref" href="mempsync.html" title="DbEnv::memp_sync()">DbEnv::memp_sync()</a>
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documentation for more information.)
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</p>
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<p>
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The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method configures a file in the
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cache, not only operations performed using the specified
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<a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a> handle.
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</p>
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<p>
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The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> method may not be called after the
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<a class="xref" href="mempfopen.html" title="DbMpoolFile::open()">DbMpoolFile::open()</a>
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method is called. If the file is already open in the cache when
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<a class="xref" href="mempfopen.html" title="DbMpoolFile::open()">DbMpoolFile::open()</a> is
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called, the information specified to <code class="methodname">DbMpoolFile::set_lsn_offset()</code>
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must be consistent with the existing file or an error will be returned.
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</p>
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<p>
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The <code class="methodname">DbMpoolFile::set_lsn_offset()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3651093"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3651083"></a>lsn_offset</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>lsn_offset</strong></span> parameter is the
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zero-based byte offset of the log sequence number on the file's pages.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3650807"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<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>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3651127"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="mempset_ftype.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="memp.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="mempset_maxsize.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DbMpoolFile::set_ftype() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DbMpoolFile::set_maxsize()</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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