ORA-07251: spcre: semget error, could not allocate any semaphores. Cause: Sem...

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ORA-07251: spcre:semget error, could not allocate any semaphores.
Cause: Semget failed to even allocate a single semaphore.Either they are all in use
or the system is not configured to have any semaphores.
Action: Checkto see if all semaphores are in use. Check to see if system is
configured to have semaphores. Check errno.