mirror of
https://github.com/yasuhirokimura/db18
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Yasuhiro KIMURA
140 lines
5.1 KiB
HTML
140 lines
5.1 KiB
HTML
<?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_ENV->set_mp_pagesize()</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 8. The DB_MPOOLFILE Handle" />
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<p>Library Version 18.1.40</p>
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<tr>
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<th colspan="3" align="center">
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<span xmlns="http://www.w3.org/1999/xhtml">DB_ENV->set_mp_pagesize()</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="envset_mp_mtxcount.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="envset_mp_tablesize.html">Next</a></td>
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<hr />
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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="envset_mp_pagesize"></a>
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<span>DB_ENV->set_mp_pagesize()</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_ENV->set_mp_pagesize(DB_ENV *dbenv, u_int32_t pagesize); </pre>
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<p>
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The <code class="methodname">DB_ENV->set_mp_pagesize()</code> method sets
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the pagesize used to allocate the hash table and the number of
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mutexes expected to be needed by the buffer pool.
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</p>
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<p>
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This method may be called only before the environment is opened.
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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="idm139753798858848"></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="idm139753798876592"></a>pagesize</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 pagesize parameter specifies expected page
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size use. Generally, it is set to the expected
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average page size for all the data pages that are
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in the buffer pool.
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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="idm139753798886560"></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>,
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<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="idm139753798854576"></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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<a class="xref" href="envget_mp_pagesize.html" title="DB_ENV->get_mp_pagesize()">
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<span>DB_ENV->get_mp_pagesize()</span>
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</a>
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</p>
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</div>
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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="envset_mp_mtxcount.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="envset_mp_tablesize.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_ENV->set_mp_mtxcount()</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_ENV->set_mp_tablesize()</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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