I think I learn something new practically every time that I talk to or work with customers. Here’s a nugget of information that may be worth its weight in gold if you are upgrading in a RAC environment. You might find after the upgrade that your DBMS_SCHEDULER jobs seem to be scheduled but unable to run, as if the scheduler is stuck for some reason.
The reason for this is an interesting parameter job_queue_processes whose behavior changed in 11.2. The parameter itself has been around for a long time, but here is the important note from the 11.2 Upgrade …
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