How to Resolve ORA-27492: unable to run job: scheduler unavailable

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Error ORA-27492 Found error ORA-27492 when executed a tuning job. BEGIN   SYS.DBMS_SCHEDULER.RUN_JOB     (job_name             => ‘SYS.SQLTUNE_JOB_61535_2043’     ,use_current_session  => FALSE); END; Error at line 2 ORA-27492: unable to run job “SYS”.”SQLTUNE_JOB_61535_2043″: scheduler unavailable ORA-06512: in “SYS.DBMS_ISCHED”, line 209 ORA-06512: in “SYS.DBMS_SCHEDULER”, line 594 ORA-06512: in line 2 […]