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ipcclean *- clean up shared memory and semaphores from aborted backends
ipcclean
Ipcclean cleans up shared memory and semaphore space from aborted backends. Only the DBA should execute this program, as it can cause bizarre behavior if run during multi-user execution. This program should be ran if errors such as semget: No space left on device are encountered in starting up programs like the Postmaster or POSTGRES backend.
If this command is run while a Postmaster or backend is running, the shared memory and semaphores allocated by the postmaster will be deleted. This will result in a general failure of the backends which are currently running.