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<div class="sect1" lang="en" xml:lang="en">
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<div>
<h2 class="title" style="clear: both"><a id="db_replicate"></a>db_replicate</h2>
</div>
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<pre class="programlisting">db_replicate [-MVv] [-h home]
[-L file] [-P password] [-T num_threads] [-t secs] </pre>
<p>
The <span class="command"><strong>db_replicate</strong></span> utility is a daemon process
that provides replication/HA services on a transactional
environment. This utility enables you to upgrade an existing
Transactional Data Store application to an HA application with
minor modifications. For more information on the db_replicate
utility, see the
<a href="../../programmer_reference/rep_replicate.html" class="olink">Running Replication Using the db_replicate Utility </a>
section in the <span class="emphasis"><em>Berkeley DB Programmer's Reference Guide.</em></span>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
<p>
This utility is not supported for use with the DB SQL APIs.
</p>
</div>
<p>
The options are as follows:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<span class="bold"><strong>-h</strong></span>
</p>
<p>
Specify a home directory for the database environment; by default, the
current working directory is used.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-L</strong></span>
</p>
<p>
Log the execution of the <span class="command"><strong>db_replicate</strong></span>
utility to the specified file in the following format,
where <span class="emphasis"><em>###</em></span> is the process ID, and the
date is the time the utility was started.
</p>
<pre class="programlisting"> db_replicate: ### Wed Jun 15 01:23:45 EDT 1995 </pre>
<p>
Additionally, events such as site role changes will be
noted in the log file. This file will be removed if the
<span class="command"><strong>db_replicate</strong></span> utility exits gracefully.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-M</strong></span>
</p>
<p>
Start the <span class="command"><strong>db_replicate</strong></span> utility to be
the master site of the replication group. Otherwise,
the site will be started as a client replica.
</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, be aware 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>-T</strong></span>
</p>
<p>
Specify the number of replication message processing threads.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-t</strong></span>
</p>
<p>
Specify how often (in seconds) the utility will check
for program interruption and resend the last log record.
</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>
Turn on replication verbose messages. These messages will
be written to the standard output and will be quite
voluminous.
</p>
</li>
</ul>
</div>
<p>
The <span class="command"><strong>db_replicate</strong></span> utility uses 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>, or because the utility
was run in a directory containing a Berkeley DB environment). In
order to avoid environment corruption when using a Berkeley DB
environment, <span class="command"><strong>db_replicate</strong></span> should always be
given the chance to detach from the environment and exit
gracefully. To cause <span class="command"><strong>db_replicate</strong></span> to release
all environment resources and exit cleanly, send it an interrupt
signal (SIGINT).
</p>
<p>
The <span class="command"><strong>db_replicate</strong></span> utility does not attempt to
create the Berkeley DB shared memory regions if they do not
already exist. The application that creates the region should be
started first, and once the region is created, the
<span class="command"><strong>db_replicate</strong></span> utility should be started. The
application must use the
<a class="xref" href="envopen.html#envopen_DB_INIT_REP">
<code class="literal">DB_INIT_REP</code>
</a>
and <a class="xref" href="envopen.html#envopen_DB_THREAD">
<code class="literal">DB_THREAD</code>
</a>
flags when creating the environment.
</p>
<p>
The <span class="command"><strong>db_replicate</strong></span> utility exits 0 on success,
and >0 if an error occurs.
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp5680480"></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="idp5723704"></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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