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<TITLE>IPCCLEAN(UNIX) manual page</TITLE>
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<A HREF="pgsql.html">PostgreSQL Contents</A>
<H2><A NAME="sect0" HREF="#toc0">NAME </A></H2>
ipcclean - clean up shared memory and semaphores from aborted backends
<H2><A NAME="sect1" HREF="#toc1">SYNOPSIS </A></H2>
<B>ipcclean</B>
<H2><A NAME="sect2" HREF="#toc2">DESCRIPTION </A></H2>
<I>Ipcclean</I> cleans up shared memory and semaphore
space from aborted backends by deleting all instances owned by user `postgres'.
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 <B>semget: No space left on device</B> are encountered
when starting up the <I>postmaster</I> or the backend server.
<H2><A NAME="sect3" HREF="#toc3">BUGS </A></H2>
If this command
is executed while a <I>postmaster</I> is running, the shared memory and semaphores
allocated by the <I>postmaster</I> will be deleted. This will result in a general
failure of the backends servers started by that <I>postmaster</I>. <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. Suggestions are welcome.
<P>
The script makes assumption about the format of output of the <B>ipcs</B> utility
which may not be true across different operating systems. Therefore, it
may not work on your particular OS. <P>
<HR><P>
<A NAME="toc"><B>Table of Contents</B></A><P>
<UL>
<LI><A NAME="toc0" HREF="#sect0">NAME</A></LI>
<LI><A NAME="toc1" HREF="#sect1">SYNOPSIS</A></LI>
<LI><A NAME="toc2" HREF="#sect2">DESCRIPTION</A></LI>
<LI><A NAME="toc3" HREF="#sect3">BUGS</A></LI>
</UL>
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