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ORA-07252:

spcre: semget error, could not allocate semaphores.
Cause: Semget system call returned an error. Possible resource limit problem.
Action: Check errno. Verify that enough semaphores are available in system. If additional errors occur in destroying the semaphore sets then sercose[0] will be non-zero. If this occurs, remove the semaphore sets using ipcrm.