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<div class="sect1" lang="en" xml:lang="en">
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<h2 class="title" style="clear: both"><a id="db_checkpoint"></a>db_checkpoint</h2>
</div>
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</div>
<pre class="programlisting">db_checkpoint [-1Vv] [-h home]
[-k kbytes] [-L file] [-P password] [-p min] </pre>
<p>
The <span class="command"><strong>db_checkpoint</strong></span> utility is a daemon process that monitors the
database log, and periodically calls
<a class="xref" href="txncheckpoint.html" title="DbEnv::txn_checkpoint()">DbEnv::txn_checkpoint()</a>
to checkpoint it.
</p>
<p>
The options are as follows:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<span class="bold"><strong>-1</strong></span>
</p>
<p>
Force a single checkpoint of the log (regardless of whether or not
there has been activity since the last checkpoint), and then exit.
</p>
<p>
When the <span class="bold"><strong>-1</strong></span> flag is specified, the
<span class="command"><strong>db_checkpoint</strong></span> utility will checkpoint the log even if unable to find
an existing database environment. This functionality is useful when
upgrading database environments from one version of Berkeley DB to
another.
</p>
</li>
<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>-k</strong></span>
</p>
<p>
Checkpoint the database at least as often as every <span class="bold"><strong>kbytes</strong></span> of log file are written.
</p>
</li>
<li>
<p>
<span class="bold"><strong>-L</strong></span>
</p>
<p>
Log the execution of the <span class="command"><strong>db_checkpoint</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_checkpoint: ### Wed Jun 15 01:23:45 EDT 1995 </pre>
<p>
This file will be removed if the <span class="command"><strong>db_checkpoint</strong></span>
utility exits gracefully.
</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>-p</strong></span>
</p>
<p>
Checkpoint the database at least every <span class="bold"><strong>min</strong></span> minutes
if there has been any activity since the last checkpoint.
</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>
Write the time of each checkpoint attempt to the standard output.
</p>
</li>
</ul>
</div>
<p>
At least one of the <span class="bold"><strong>-1</strong></span>, <span class="bold"><strong>-k</strong></span>, and <span class="bold"><strong>-p</strong></span>
options must be specified.
</p>
<p>
The <span class="command"><strong>db_checkpoint</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_checkpoint</strong></span> should always be given the chance to detach
from the environment and exit gracefully. To cause <span class="command"><strong>db_checkpoint</strong></span> to
release all environment resources and exit cleanly, send it an
interrupt signal (SIGINT).
</p>
<p>
The <span class="command"><strong>db_checkpoint</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_checkpoint</strong></span> utility should be started.
</p>
<p>
The <span class="command"><strong>db_checkpoint</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="idp10587944"></a>Environment Variables</h3>
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<div class="sect3" lang="en" xml:lang="en">
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<div>
<h4 class="title"><a id="idp10588200"></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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