Oracle Solution for Error ora-07264

ORA-07264: spwat: semop error, unable to decrement semaphore.

What triggered the Error:

Semop system call returned an error. Semaphore set may not exist.

What should we do to fix it:

Check errno. Semaphore ID is returned in sercose[0]. Verify semaphore set exists. A possible cause for this error is that a "shutdown abort" was done while this process was running.