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IPCCLEAN(1) PostgreSQL Server Applications IPCCLEAN(1)
ipcclean - remove shared memory and semaphores from an aborted PostgreSQL server
ipcclean 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 PostgreSQL server (postmas-
ter(1)). Note that immediately restarting the server will also clean up shared memory and
semaphores, so this command is of little real utility.
Only the database administrator should execute this program as it can cause bizarre behav-
ior (i.e., crashes) if run during multiuser execution. If this command is executed while a
postmaster is running, the shared memory and semaphores allocated by the postmaster will
be deleted. This will result in a general failure of the backend servers started by that
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 postmaster can now clean up by
itself, it is unlikely that ipcclean will be improved upon in the future.
The script makes assumption about the format of output of the ipcs utility which may not
be true across different operating systems. Therefore, it may not work on your particular
Application 2002-11-22 IPCCLEAN(1)
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