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121 lines
4.4 KiB
HTML
121 lines
4.4 KiB
HTML
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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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<html xmlns="http://www.w3.org/1999/xhtml">
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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>db_tuner</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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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="utilities.html" title="Appendix A. Berkeley DB Command Line Utilities" />
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<link rel="prev" href="db_stat.html" title="db_stat" />
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<link rel="next" href="db_upgrade.html" title="db_upgrade" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">db_tuner</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="db_stat.html">Prev</a> </td>
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<th width="60%" align="center">Appendix A.
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Berkeley DB Command Line Utilities
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="db_upgrade.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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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="db_tuner"></a>db_tuner</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">db_tuner [-c cachesize] -d file [-h home] [-s database] [-v] </pre>
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<p>
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The <span class="command"><strong>db_tuner</strong></span> utility analyzes the data in a btree database, and suggests a page size that is likely to deliver optimal operation.
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</p>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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The <span class="command"><strong>db_tuner</strong></span> utility assumes that databases are compacted when analysing the data. The analysis is based on a static view of the data and the data access and update patterns are not take into account.
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</p>
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</div>
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<p>
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The options are as follows:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<span class="bold"><strong>-c</strong></span>
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</p>
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<p>
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Specify a value of the cachesize, otherwise, the default value will
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be set.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-d</strong></span>
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</p>
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<p>
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Display database statistics for the specified file. If the database contains multiple databases and the -s flag is not specified, the statistics are for the internal database that describes the other databases the file contains, and not for the file as a whole.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-h</strong></span>
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</p>
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<p>
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Specify a home directory for the database environment.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-s</strong></span>
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</p>
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<p>
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Display page size recommendation for the specified database contained in the file specified with the -d flag.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>-v</strong></span>
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</p>
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<p>
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Display verbose information.
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</p>
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</li>
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</ul>
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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="db_stat.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="utilities.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="db_upgrade.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">db_stat </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"> db_upgrade</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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