For db version 10.2.0.3, as this is what I have experience with. To disable: dbms_scheduler.set_scheduler_attribute('SCHEDULER_DISABLED','TRUE'); <- note this is not a BOOLEAN but a string. To enable: dbms_scheduler.set_scheduler_attribute('SCHEDULER_DISABLED','TRUE'); <- note this is not a BOOLEAN but a string. Then select * from DBA_SCHEDULER_GLOBAL_ATTRIBUTE should show 'SCHEDULER_DISABLED TRUE". I recall that the scheduler will not run when the db is in restricted mode. We have had issues with duplicating a production database and the duplicated database starting up (open resetlogs) with the scheduler running. I can document if you need this. I hope this helps. Daniel -- //www.freelists.org/webpage/oracle-l