Oracle Error Message
ORA-27492: unable to run job “string.string”: scheduler unavailable
Reason for the Error
A job run with current session set to false can not be issued if the scheduler is not active. Check value of job_queue_processes parameter, issue dbms_ijob.set_enabled(true), database is in upgrade/migrade mode, database is in data guard mode, or scheduler attribute SCHEDULER_DISABLED is set to TRUE
Solution
Run the job in the current session or activate the scheduler