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<h2 class="title" style="clear: both"><a id="db_log_verify"></a>db_log_verify</h2>
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<pre class="programlisting">
db_log_verify [-cNvV] [-h home to verify] [-H temporary home]
[-P password] [-C cache size]
[-b start lsn] [-e end lsn] [-s start time] [-z end time]
[-d database file name] [-D database name]
</pre>
<p>
The <span class="command"><strong>db_log_verify</strong></span> utility verifies the log files of a specific database environment.
This utility verifies a specific range of log records, or changed log records of a specific database.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
<p>
If the application(s) that use the environment make use of
the <a class="xref" href="envset_lg_dir.html" title="DbEnv::set_lg_dir()">DbEnv::set_lg_dir()</a>
method, then in order for this utility to run correctly,
you need a
<a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
file which sets the proper paths using the
<a class="xref" href="set_lg_dir_parameter.html" title="set_lg_dir">set_lg_dir</a>
configuration parameter.
</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 the cache size (in megabytes) of the temporary database environment internally used during the log verification.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-b</strong></span>
</p>
<p>
Specify the starting log record (by lsn) to verify.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-c</strong></span>
</p>
<p>
Specify whether to continue the verification after an error is detected.
If not specified, the verification stops when the first error is detected.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-D</strong></span>
</p>
<p>
Specify a database name. Only log records related to this database are verified.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-d</strong></span>
</p>
<p>
Specify a database file name. Only log records related this database file are verified.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-e</strong></span>
</p>
<p>
Specify the ending log record by lsn.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-h</strong></span>
</p>
<p>
Specify a home directory of the database environment whose log is to be verified.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-H</strong></span>
</p>
<p>
Specify a home directory for this utility to create a temporarily database
environment to store runtime data during the verification.
</p>
<p>
It is an error to specify the same directory as the -h option. If this directory is not specified, all
temporary databases created during the verification will be in-memory, which is not
a problem if the log files to verify are not huge.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-N</strong></span>
</p>
<p>
Do not acquire shared region mutexes while running. Other problems,
such as potentially fatal errors in Berkeley DB, are ignored as
well. This option is intended only for debugging errors, and should
not be used under any other circumstances.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-P</strong></span>
</p>
<p>
Specify an environment password. Although Berkeley DB utilities
overwrite password strings as soon as possible, there may be
a window of vulnerability on systems where unprivileged users can see
command-line arguments or where utilities are not able to overwrite
the memory containing the command-line arguments.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-s</strong></span>
</p>
<p>
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.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-V</strong></span>
</p>
<p>
Write the library version number to the standard output and exit.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-v</strong></span>
</p>
<p>
Enable verbose mode to display verbose output during the verification process.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-z</strong></span>
</p>
<p>
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.
</p>
</li>
</ul>
</div>
<p>
To specify a range of log records, you must provide
either an lsn range or a time range. You can neither specify both nor specify an lsn and a time as a range.
</p>
<p>
If the log footprint is over several megabytes, specify a home
directory and a big cache size for log verification internal use. Else, the process'
private memory may be exhausted before the verification completes.</p>
<p>
The <span class="command"><strong>db_log_verify</strong></span> utility does not perform the
locking function, even in Berkeley DB environments that are configured with a
locking subsystem. All errors are written to stderr, and all normal and verbose messages
are written to stdout.
</p>
<p>
The <span class="command"><strong>db_log_verify</strong></span> utility can be used with a Berkeley DB environment (as
described for the <span class="bold"><strong>-h</strong></span> option, the
environment variable <span class="bold"><strong>DB_HOME</strong></span>).
To avoid environment corruption when using a
Berkeley DB environment, <span class="command"><strong>db_log_verify</strong></span> must be given the chance
to detach from the environment and exit gracefully. For the
<span class="command"><strong>db_log_verify</strong></span> utility to release all environment resources and exit, send
an interrupt signal (SIGINT) to it.
</p>
<p>
The <span class="command"><strong>db_log_verify</strong></span> utility returns a non-zero error value on failure and 0 on success.
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp5408560"></a>Environment Variables</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp5408752"></a>DB_HOME</h4>
</div>
</div>
</div>
<p>
If the <span class="bold"><strong>-h</strong></span> option is not specified and
the environment variable DB_HOME is set, it is used as the path of the
database home, as described in the
<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a>
method.
</p>
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