What causes jobs to go into a Not Scheduled status?

Document ID : KB000104100
Last Modified Date : 03/07/2018
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Question:
What would cause a job to go into a status of "Not Scheduled"?
Answer:
Prior to 15.3, if a scheduled job was processing, and during the time which it was processing, the BG server went down or was restarted, the job that was in process would go into a "Not Scheduled" status.

In 15.3, the Job Monitor functionality was delivered which monitors all running jobs and keeps a thread open, so that if this condition were to occur where the BG server fails or was recycled, the job would re-start on its own because the Job Monitor is tracking the threads.  This prevents the problem from occurring.