on 09-26-2008 2:12 AM
Hello,
I have a question that is rattling my brain but I cannot find anything in SAP help or SAP notes.
Recently, while monitoring our customer SAP systems running on Oracle db, we found that we were getting repititive MISSING_STATISTICS alerts daily. We checked and found that both 'Update Statistics' and 'DBCHECK' were scheduled to run daily at the following times:
The current schedule for DEV system is
01:00 UpdateStats
06:00 CheckDB
The current schedule for QAS system is
03:00 UpdateStats
04:00 CheckDB
Someone suggested to us that the solution is to change this schedule in a manner that CheckDB runs 1 hr before UpdateStats.
But this doesn't make sense to me because if CheckDB runs before UpdateStats, then the CheckDB will still throw the same missing_statistics alerts the next day instead of same day. As a result, we will still be getting these alerts, even if they come one day late.
My question is:
1. Is that person correct in suggesting this change of schedule?
2. Is there any way, we can avoid getting these repititive alerts and find a permanent fix for this problem?
Any suggestions and/or references to SAP Notes/help topics are most welcome.
Regards,
Shitij
are the mising stats error for the same tables .
Are these tables included in normal update stats schedule.
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1. do not update stats while there is a lot of update activities going on, especially on BW systems.
2. run update stats, then run checkDB quickly after.
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Hi,
Try to analyse this schedule .This should solve your issue:
1. Investigate which tables need new statistics
Run : Check optimizer statistics
Mon - Thu and Sunday 23:00
2. Create new statistics for tables chosen by the previous job
Run : Refresh optimizer/space statistics
Mon - Fri 01:00
3. Create statistics for all tables
Run : Create new optimizer/space statistics
Sat 01:00
4. Check the tree structure for all tables/objects in the DB
Run : Check database structure (all objects)
Sat 23:00
Regards,
just a thought is till how long does ur update stats run ??
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Hello,
First, thank you. At least you searched for information before posting
Then, to answer the questions I'd need more information.
I have to say that changing the schedule does not make any sense.
I'd investigate a little more
Can you tell us, your DB version, SAP version and BRCONNECT version and patch level?
-> first I'd get one of the objects where you get the error MISSING_STATISTICS (you can post one example here)
-> then I'd check in DB21 if there is any "special" condition for its statistics calculation (you can post the DB21 line here)
-> then I'd check the brconnect stats log and check if the object appears there and what is reported for it.
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