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<title>db_log_verify</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="utilities.html" title="Appendix A. Berkeley DB Command Line Utilities" />
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<p>Library Version 11.2.5.2</p>
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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_log_verify</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_load.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_printlog.html">Next</a></td>
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<h2 class="title" style="clear: both"><a id="db_log_verify"></a>db_log_verify</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">
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db_log_verify [-cNvV] [-h home to verify] [-H temporary home]
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[-P password] [-C cache size]
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[-b start lsn] [-e end lsn] [-s start time] [-z end time]
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[-d database file name] [-D database name]
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</pre>
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<p>
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The <span class="command"><strong>db_log_verify</strong></span> utility verifies the log files of a specific database environment.
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This utility verifies a specific range of log records, or changed log records of a specific database.
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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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Specify the cache size (in megabytes) of the temporary database environment internally used during the log verification.
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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>-b</strong></span>
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</p>
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<p>
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Specify the starting log record (by lsn) to 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>-c</strong></span>
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</p>
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<p>
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Specify whether to continue the verification after an error is detected.
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If not specified, the verification stops when the first error is detected.
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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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Specify a database name. Only log records related to this database are verified.
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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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Specify a database file name. Only log records related this database file are verified.
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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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Specify the ending log record by lsn.
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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 of the database environment whose log is to be verified.
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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 this utility to create a temporarily database
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environment to store runtime data during the verification.
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</p>
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<p>
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It is an error to specify the same directory as the -h option. If this directory is not specified, all
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temporary databases created during the verification will be in-memory, which is not
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a problem if the log files to verify are not huge.
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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>-N</strong></span>
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</p>
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<p>
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Do not acquire shared region mutexes while running. Other problems,
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such as potentially fatal errors in Berkeley DB, are ignored as
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well. This option is intended only for debugging errors, and should
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not be used under any other circumstances.
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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, 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>-s</strong></span>
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</p>
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<p>
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Specify the starting log record by time. The time range specified is not precise because the lsn of the most recent time point is used as the starting lsn.
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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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Enable verbose mode to display verbose output during the verification process.
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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>-z</strong></span>
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</p>
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<p>
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Specify the ending log record by time. The time range specified is not precise because the lsn of the most recent time point is used as the ending lsn.
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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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To specify a range of log records, you must provide
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either an lsn range or a time range. You can neither specify both nor specify an lsn and a time as a range.
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</p>
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<p>
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If the log footprint is over several megabytes, specify a home
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directory and a big cache size for log verification internal use. Else, the process'
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private memory may be exhausted before the verification completes.</p>
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<p>
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The <span class="command"><strong>db_log_verify</strong></span> utility does not perform the
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locking function, even in Berkeley DB environments that are configured with a
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locking subsystem. All errors are written to stderr, and all normal and verbose messages
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are written to stdout.
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</p>
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<p>
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The <span class="command"><strong>db_log_verify</strong></span> utility can 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>).
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To avoid environment corruption when using a
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Berkeley DB environment, <span class="command"><strong>db_log_verify</strong></span> must be given the chance
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to detach from the environment and exit gracefully. For the
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<span class="command"><strong>db_log_verify</strong></span> utility to release all environment resources and exit, send
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an interrupt signal (SIGINT) to it.
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</p>
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<p>
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The <span class="command"><strong>db_log_verify</strong></span> utility returns a non-zero error value on failure and 0 on success.
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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="id3947461"></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="id3946487"></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="DB_ENV->open()">DB_ENV->open()</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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<a accesskey="u" href="utilities.html">Up</a>
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</td>
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<td width="40%" align="left" valign="top">db_load </td>
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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_printlog</td>
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