Date: Fri, 2 Mar 2012 17:46:50 +0000
We have a system that runs on UTC and is active during the day in North America. As such I recently changed the autotask used maintenance windows so that they would run during the N.A. nighttime. After I did this, the next day the jobs ran when expected (the new time), but then didn't run for about a week. I was getting worried something had gotten messed up but then finally last night they did run as expected. You can see what I did here http://tinky2jed.wordpress.com/oracle-stuff/changing-the-oracle-database-default-maintenance-window-time/
I was thinking maybe it didn't think there was any work to do, but I would think it still would kick off the job to figure that out. So, I'm still wondering why it didn't run for almost a week. Prior to that it seems it has run every day during the week.
Running at the default times
sql tuning advisor SUCCEEDED 19-FEB-12 06.00.02.365020 AM UTC +000 00:07:06 auto optimizer stats collection SUCCEEDED 19-FEB-12 06.00.08.132191 AM UTC +000 03:39:37 auto space advisor SUCCEEDED 19-FEB-12 06.00.08.176655 AM UTC +000 17:36:34 auto optimizer stats collection SUCCEEDED 20-FEB-12 10.00.02.106531 PM UTC +000 03:12:36 auto space advisor STOPPED 20-FEB-12 10.00.07.821675 PM UTC +000 03:59:52 sql tuning advisor SUCCEEDED 20-FEB-12 10.00.07.868723 PM UTC +000 00:21:15 auto optimizer stats collection SUCCEEDED 21-FEB-12 10.00.09.031744 PM UTC +000 03:37:24 auto space advisor STOPPED 21-FEB-12 10.00.09.041172 PM UTC +000 03:59:51 sql tuning advisor SUCCEEDED 21-FEB-12 10.00.09.090205 PM UTC +000 00:11:34 auto optimizer stats collection SUCCEEDED 22-FEB-12 10.00.07.951870 PM UTC +000 03:31:40 auto space advisor STOPPED 22-FEB-12 10.00.07.971702 PM UTC +000 03:59:52 sql tuning advisor SUCCEEDED 22-FEB-12 10.00.08.004047 PM UTC +000 00:02:00 Changed the window time, and runs at new times auto optimizer stats collection SUCCEEDED 24-FEB-12 05.00.02.586962 AM UTC +000 03:23:57 auto space advisor STOPPED 24-FEB-12 05.00.07.957369 AM UTC +000 03:59:52 sql tuning advisor SUCCEEDED 24-FEB-12 05.00.07.968124 AM UTC +000 00:01:58 auto space advisor SUCCEEDED 25-FEB-12 01.00.02.499372 PM UTC +000 12:33:12 auto optimizer stats collection SUCCEEDED 25-FEB-12 01.00.09.406688 PM UTC +000 03:59:18 sql tuning advisor SUCCEEDED 25-FEB-12 01.00.09.413130 PM UTC +000 00:12:37 Doesn't run for almost a week, then finally does at correct "new" time sql tuning advisor SUCCEEDED 02-MAR-12 05.00.02.579958 AM UTC +000 00:26:42 auto optimizer stats collection STOPPED 02-MAR-12 05.00.08.646075 AM UTC +000 03:59:53 auto space advisor STOPPED 02-MAR-12 05.00.08.689854 AM UTC +000 03:59:53