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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/Attic/ipcclean.sgml,v 1.2 2000/10/05 19:48:18 momjian Exp $
Postgres documentation
-->
<refentry id="APP-IPCCLEAN">
<refmeta>
<refentrytitle id="APP-IPCCLEAN-TITLE">
<application>ipcclean</application>
</refentrytitle>
<refmiscinfo>Application</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
<application>ipcclean</application>
</refname>
<refpurpose>
Clean up shared memory and semaphores from aborted backends
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
ipcclean
</synopsis>
<refsect2 id="R2-APP-IPCCLEAN-1">
<refsect2info>
<date>1999-07-20</date>
</refsect2info>
<title>
Inputs
</title>
<para>
None.
</para>
</refsect2>
<refsect2 id="R2-APP-IPCCLEAN-2">
<refsect2info>
<date>1999-07-30</date>
</refsect2info>
<title>
Outputs
</title>
<para>
None.
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-APP-IPCCLEAN-1">
<refsect1info>
<date>1999-07-20</date>
</refsect1info>
<title>
Description
</title>
<para>
<application>ipcclean</application>
cleans up shared memory and semaphore space from aborted backends by
deleting all instances owned by user <literal>postgres</literal>.
Only the DBA
should execute this program as it can cause bizarre behavior (i.e.,
crashes) if run during multi-user execution. This program should be
executed if messages such as
<computeroutput>
semget: No space left on device
</computeroutput>
are encountered when starting up the
<application>postmaster</application> or the backend server.
</para>
<para>
If this command is executed while <application>postmaster</application>
is running, the shared memory and semaphores allocated by the
<application>postmaster</application>
will be deleted. This will result in a general failure of the
backend servers started by that
<application>postmaster</application>.
</para>
<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.
Suggestions are welcome.
</para>
<para>
The script makes assumption about the format of output of the
<application>ipcs</application>
utility which may not be true across different operating systems.
Therefore, it may not work on your particular OS.
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
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sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
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sgml-default-dtd-file:"../reference.ced"
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sgml-local-catalogs:"/usr/lib/sgml/catalog"
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End:
-->
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