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Yasuhiro KIMURA
163 lines
6.3 KiB
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163 lines
6.3 KiB
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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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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<title>DB_MPOOLFILE->set_lsn_offset()</title>
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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 8. The DB_MPOOLFILE Handle" />
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<p>Library Version 18.1.40</p>
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<th colspan="3" align="center">
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<span xmlns="http://www.w3.org/1999/xhtml">DB_MPOOLFILE->set_lsn_offset()</span>
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</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 8.
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The DB_MPOOLFILE 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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<div class="sect1" 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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<h2 class="title" style="clear: both"><a id="mempset_lsn_offset"></a>
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<span>DB_MPOOLFILE->set_lsn_offset()</span>
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</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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DB_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset); </pre>
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<p>
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The <code class="methodname">DB_MPOOLFILE->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 7. The DB_LSN Handle">DB_LSN</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="DB_ENV->memp_sync()">
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<span>DB_ENV->memp_sync()</span>
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</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">DB_MPOOLFILE->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 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</a> handle.
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</p>
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<p>
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The <code class="methodname">DB_MPOOLFILE->set_lsn_offset()</code> method may not be called after the
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<a class="xref" href="mempfopen.html" title="DB_MPOOLFILE->open()">
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<span>DB_MPOOLFILE->open()</span>
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</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="DB_MPOOLFILE->open()">
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<span>DB_MPOOLFILE->open()</span>
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</a> is
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called, the information specified to <code class="methodname">DB_MPOOLFILE->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">DB_MPOOLFILE->set_lsn_offset()</code> <span>
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<span>
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method returns a non-zero error value on failure and 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="idm139753798488176"></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="idm139753798450992"></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="idm139753798436864"></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 DB_ENV Handle">DB_ENV</a>, <a class="link" href="memp.html" title="Chapter 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</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="idm139753798438400"></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">
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<span>DB_MPOOLFILE->set_ftype()</span>
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</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">
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<span>DB_MPOOLFILE->set_maxsize()</span>
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</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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