<?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>db_tuner</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="utilities.html" title="Appendix A. Berkeley DB Command Line Utilities" /> <link rel="prev" href="db_stat.html" title="db_stat" /> <link rel="next" href="db_upgrade.html" title="db_upgrade" /> </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">db_tuner</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="db_stat.html">Prev</a> </td> <th width="60%" align="center">Appendix A. Berkeley DB Command Line Utilities </th> <td width="20%" align="right"> <a accesskey="n" href="db_upgrade.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="db_tuner"></a>db_tuner</h2> </div> </div> </div> <pre class="programlisting">db_tuner [-c cachesize] -d file [-h home] [-s database] [-v] </pre> <p> 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. </p> <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"> <h3 class="title">Note</h3> <p> 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. </p> </div> <p> The options are as follows: </p> <div class="itemizedlist"> <ul type="disc"> <li> <p> <span class="bold"><strong>-c</strong></span> </p> <p> Specify a value of the cachesize, otherwise, the default value will be set. </p> </li> <li> <p> <span class="bold"><strong>-d</strong></span> </p> <p> 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. </p> </li> <li> <p> <span class="bold"><strong>-h</strong></span> </p> <p> Specify a home directory for the database environment. </p> </li> <li> <p> <span class="bold"><strong>-s</strong></span> </p> <p> Display page size recommendation for the specified database contained in the file specified with the -d flag. </p> </li> <li> <p> <span class="bold"><strong>-v</strong></span> </p> <p> Display verbose information. </p> </li> </ul> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="db_stat.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="utilities.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="db_upgrade.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">db_stat </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> db_upgrade</td> </tr> </table> </div> </body> </html>