RE: high cpu on query
- From: "Kerber, Andrew W." <Andrew.Kerber@xxxxxxx>
- To: joseph.armstrong-champ@xxxxxxxxx, "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 29 Jun 2007 13:11:39 -0500
We never found the cause, but we have fixed similar problems in the past
by rebuilding the indexes on the table (alter index owner.indexname
rebuild online;)
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Armstrong-Champ
Sent: Friday, June 29, 2007 11:57 AM
To: ORACLE-L
Subject: high cpu on query
We upgraded to 10.2 a month ago and everything was running fine until 2
days ago when a query started running very slow in prod. It is selecting
data from a view using distinct and does an 'order by', too. It runs ok
in a copy of the db which was refreshed just after the upgrade. The
difference in the number of rows between the 2 databases isn't that much
but the execution plans are very different. The indexes are the same in
both. I manually updated the stats for the affected tables in another
copy which was refreshed yesterday but the plan didn't change. There is
a high percentage of cpu involved in the long running query.
Questions:
- what can cause a difference in the execution plans besides the stats
and indexes?
- in general what can cause a query to use a lot of cpu?
Thanks.
Joe
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