ipcclean - Clean up shared memory and semaphores from
aborted backends
SYNOPSIS
ipcclean
DESCRIPTION
ipcclean 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 semget: No space left on device are
encountered when starting up the postmaster or the backend
server.
If this command is executed while postmaster is running,
the shared memory and semaphores allocated by the postmas
ter will be deleted. This will result in a general failure
of the backend servers started by that postmaster.
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.
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 OS.
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