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<title>ipcclean</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
<a name="app-ipcclean"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p>ipcclean — remove shared memory and semaphores from a failed <span class="productname">PostgreSQL</span> server</p>
</div>
<a name="id809404"></a><div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="cmdsynopsis"><p><code class="command">ipcclean</code></p></div>
</div>
<div class="refsect1" lang="en">
<a name="r1-app-ipcclean-1"></a><h2>Description</h2>
<p> <code class="command">ipcclean</code> removes all shared memory segments and
semaphore sets owned by the current user. It is intended to be
used for cleaning up after a crashed
<span class="productname">PostgreSQL</span> server (<a href="app-postmaster.html" title="postmaster"><span class="refentrytitle"><a name="app-postmaster-title"></a><span class="application">postmaster</span></span></a>). Note that immediately restarting the
server will also clean up shared memory and semaphores, so this
command is of little real utility.
</p>
<p> Only the database administrator should execute this program as it
can cause bizarre behavior (i.e., crashes) if run during multiuser
execution. If this command is executed while a server is running,
the shared memory and semaphores allocated by that server will be
deleted, which would have rather severe consequences for that
server.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id809470"></a><h2>Notes</h2>
<p> This script is a hack, but in the many years since it was written,
no one has come up with an equally effective and portable solution.
Since the <code class="command">postmaster</code> can now clean up by
itself, it is unlikely that <code class="command">ipcclean</code> will be
improved upon in the future.
</p>
<p> The script makes assumptions about the output format of the
<code class="command">ipcs</code>
utility which may not be true across different operating systems.
Therefore, it may not work on your particular OS. It's wise to
look at the script before trying it.
</p>
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