2011-09-13 17:44:24 +00:00
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>db_recover</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="utilities.html" title="Appendix A. Berkeley DB Command Line Utilities" />
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<link rel="prev" href="db_printlog.html" title="db_printlog" />
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<link rel="next" href="db_replicate.html" title="db_replicate" />
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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_recover</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_printlog.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_replicate.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_recover"></a>db_recover</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">db_recover [-cefVv] [-h home] [-P password] [-t [[CC]YY]MMDDhhmm[.SS]]] </pre>
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<p>
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The <span class="command"><strong>db_recover</strong></span> utility must be run after an unexpected application,
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Berkeley DB, or system failure to restore the database to a consistent
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state. All committed transactions are guaranteed to appear after
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<span class="command"><strong>db_recover</strong></span> has run, and all uncommitted transactions will be
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completely undone.
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</p>
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<p>
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Note that this utility performs the same action as if the
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environment is opened with the
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<a class="link" href="envopen.html#envopen_DB_RECOVER">DB_RECOVER</a>
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flag. If <code class="literal">DB_RECOVER</code> is specified on environment open,
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then use of this utility is not necessary.
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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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If the application(s) that use the environment make use of
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any of the following methods:
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</p>
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<table class="simplelist" border="0" summary="Simple list">
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<tr>
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<td>
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<a class="xref" href="envadd_data_dir.html" title="DB_ENV->add_data_dir()">DB_ENV->add_data_dir()</a>
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</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="envset_data_dir.html" title="DB_ENV->set_data_dir()">DB_ENV->set_data_dir()</a>
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</td>
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</tr>
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<tr>
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<td>
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<a class="xref" href="envset_lg_dir.html" title="DB_ENV->set_lg_dir()">DB_ENV->set_lg_dir()</a>
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</td>
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</tr>
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</table>
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<p>
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then in order for this utility to run correctly, you need a
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<a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
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file which sets the proper paths using the
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<a class="xref" href="add_data_dir_parameter.html" title="add_data_dir">add_data_dir</a>, or
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<a class="xref" href="set_lg_dir_parameter.html" title="set_lg_dir">set_lg_dir</a>
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configuration parameters.
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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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Perform catastrophic recovery instead of normal recovery.
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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>-e</strong></span>
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</p>
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<p>
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Retain the environment after running recovery. This
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option will rarely be used unless a <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is
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present in the home directory. If a <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is
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not present, then the regions will be created with default
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parameter values.
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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>-f</strong></span>
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</p>
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<p>
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Display a message on the standard output showing the percent of
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recovery completed.
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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>-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>-t</strong></span>
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</p>
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<p>
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Recover to the time specified rather than to the most current possible
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date. The timestamp argument should be in the form
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<code class="literal">[[CC]YY]MMDDhhmm[.SS]</code> where each pair of letters represents the
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following:
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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>CC</strong></span>
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</p>
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<p>
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The first two digits of the year (the century).
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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>YY</strong></span>
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</p>
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<p>
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The second two digits of the year. If "YY" is specified, but "CC" is not, a
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value for "YY" between 69 and 99 results in a "CC" value of 19. Otherwise, a
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"CC" value of 20 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>MM</strong></span>
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</p>
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<p>
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The month of the year, from 1 to 12.
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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>DD</strong></span>
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</p>
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<p>
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The day of the month, from 1 to 31.
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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>hh</strong></span>
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</p>
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<p>
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The hour of the day, from 0 to 23.
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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>mm</strong></span>
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</p>
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<p>
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The minute of the hour, from 0 to 59.
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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>SS</strong></span>
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</p>
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<p>
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The second of the minute, from 0 to 61.
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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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If the "CC" and "YY" letter pairs are not specified, the values
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default to the current year. If the "SS" letter pair is not
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specified, the value defaults to 0.
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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>-v</strong></span>
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</p>
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<p>
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Run in verbose mode.
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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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In the case of catastrophic recovery, an archival copy — or
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<span class="emphasis"><em>snapshot</em></span> — of all database files must be
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restored along with all of the log files written since the database
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file snapshot was made. (If disk space is a problem, log files may be
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referenced by symbolic links).
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<span>
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For further information on creating a database snapshot, see
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<a href="../../programmer_reference/transapp_archival.html" class="olink">Archival Procedures</a>.
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For further information on performing recovery, see
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<a href="../../programmer_reference/transapp_recovery.html" class="olink">Recovery Procedures</a>.
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</span>
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</p>
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<p>
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If the failure was not catastrophic, the files present on the system
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at the time of failure are sufficient to perform recovery.
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</p>
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<p>
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If log files are missing, <span class="command"><strong>db_recover</strong></span> will identify the missing log
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file(s) and fail, in which case the missing log files need to be
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restored and recovery performed again.
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</p>
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<p>
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The <span class="command"><strong>db_recover</strong></span> utility uses a Berkeley DB
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environment (as described for the <span class="bold"><strong>-h</strong></span>
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option, the environment variable
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<span class="bold"><strong>DB_HOME</strong></span>, or because the utility
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was run in a directory containing a Berkeley DB environment).
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In order to avoid environment corruption when using a Berkeley DB
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environment, <span class="command"><strong>db_recover</strong></span> should always be given the chance to detach
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from the environment and exit gracefully. To cause <span class="command"><strong>db_recover</strong></span> to
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release all environment resources and exit cleanly, send it an
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interrupt signal (SIGINT).
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</p>
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<p>
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The <span class="command"><strong>db_recover</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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3767678"></a>Environment Variables</h3>
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2011-09-13 17:44:24 +00:00
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3768065"></a>DB_HOME</h4>
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2011-09-13 17:44:24 +00:00
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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="DB_ENV->open()">DB_ENV->open()</a>
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method.
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