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Yasuhiro KIMURA
214 lines
8.4 KiB
HTML
214 lines
8.4 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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<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_convert</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_checkpoint.html" title="db_checkpoint" />
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<link rel="next" href="db_deadlock.html" title="db_deadlock" />
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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 18.1.40</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_convert</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_checkpoint.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_deadlock.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_convert"></a>db_convert</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">db_convert [-blVv] [-h home] [-P password] [-S o | v] file ... </pre>
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<p>
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The <span class="command"><strong>db_convert</strong></span> utility converts one or more
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files and the databases they contain to a specified byte order.
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If the byte order is not specified, databases are converted to
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the native byte order of the machine.
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</p>
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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>-b</strong></span>
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</p>
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<p>
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Convert the files and databases to the big endian order.
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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; by default, the
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current working directory is used.
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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>-l</strong></span>
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</p>
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<p>
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Convert the files and databases to the little endian order.
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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>-P</strong></span>
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</p>
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<p>
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Specify an environment password. Although Berkeley DB utilities
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overwrite password strings as soon as possible, be aware there may be
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a window of vulnerability on systems where unprivileged users can see
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command-line arguments or where utilities are not able to overwrite
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the memory containing the command-line arguments.
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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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Write the library version number to the standard output, and exit.
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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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Verify the specified database before performing db_convert. The conversion
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is not performed if the database is corrupted. Use this option when you
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are not sure about the integrity of the database.
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</p>
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<div class="itemizedlist">
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<ul type="circle">
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<li>
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<p>
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<span class="bold"><strong>o</strong></span>
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</p>
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<p>
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Skip the database checks for btree and duplicate sort order and
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for hashing. See also the <span class="bold"><strong>-o</strong></span>
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option for db_verify.
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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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Perform the standard verification on the database as performed by
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db_verify without options.
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</p>
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</li>
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</ul>
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</div>
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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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Run in verbose mode, displaying a message for each successful convert.
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</p>
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</li>
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</ul>
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</div>
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<p>
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<span class="bold"><strong>It is important to realize that Berkeley DB
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database conversions are done in place, and so are potentially
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destructive.</strong></span> This means that if the system crashes during
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the convert procedure, or if the convert procedure runs out of disk
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space, the databases may be left in an inconsistent and unrecoverable
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state.
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</p>
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<p>
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The <span class="command"><strong>db_convert</strong></span> utility may be used with a Berkeley DB environment (as
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described for the <span class="bold"><strong>-h</strong></span> option, the
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environment variable <span class="bold"><strong>DB_HOME</strong></span>, or
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because the utility was run in a directory containing a Berkeley DB
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environment). In order to avoid environment corruption when using a
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Berkeley DB environment, <span class="command"><strong>db_convert</strong></span> should always be given the chance
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to detach from the environment and exit gracefully. To cause
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<span class="command"><strong>db_convert</strong></span> to release all environment resources and exit cleanly, send
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it an interrupt signal (SIGINT).
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</p>
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<p>
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The <span class="command"><strong>db_convert</strong></span> utility exits 0 on success, and >0 if an error
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occurs.
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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="idm139755608499248"></a>Environment Variables</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="idm139755608498032"></a>DB_HOME</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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If the <span class="bold"><strong>-h</strong></span> option is not specified and
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the environment variable DB_HOME is set, it is used as the path of the
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database home, as described in the
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<a class="xref" href="envopen.html" title="DbEnv::open()">
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<span>DbEnv::open()</span>
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</a>
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method.
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</p>
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</div>
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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_checkpoint.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_deadlock.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_checkpoint </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_deadlock</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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