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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/ipcclean.sgml,v 1.11 2005/01/04 03:58:16 tgl Exp $
PostgreSQL documentation
-->
<refentry id="APP-IPCCLEAN">
<refmeta>
<refentrytitle id="APP-IPCCLEAN-TITLE"><application>ipcclean</application></refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo>Application</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ipcclean</refname>
<refpurpose>remove shared memory and semaphores from a failed <productname>PostgreSQL</productname> server</refpurpose>
</refnamediv>
<indexterm zone="app-ipcclean">
<primary>ipcclean</primary>
</indexterm>
<refsynopsisdiv>
<cmdsynopsis>
<command>ipcclean</command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="R1-APP-IPCCLEAN-1">
<title>Description</title>
<para>
<command>ipcclean</command> 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
<productname>PostgreSQL</productname> server (<xref
linkend="app-postmaster">). Note that immediately restarting the
server will also clean up shared memory and semaphores, so this
command is of little real utility.
</para>
<para>
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.
</para>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
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 <command>postmaster</command> can now clean up by
itself, it is unlikely that <command>ipcclean</command> will be
improved upon in the future.
</para>
<para>
The script makes assumptions about the output format of the
<command>ipcs</command>
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.
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
sgml-parent-document:nil
sgml-default-dtd-file:"../reference.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:"/usr/lib/sgml/catalog"
sgml-local-ecat-files:nil
End:
-->
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