Re: SQL CPU Issue

Hi Paul,

First question: Does this have anything to do with Java? Not for the famous "go somewhere else" response, but to understand how the SQL is being run.

I don't know of a way to specifically limit things to a portion of CPU. Of course, if you have multiple processors, you could limit to a portion. In general, job priority and timeslice are the tried and true tools. However, even that won't help in certain cases. I once had a user that managed a cartesian join and nearly filled up the disk before we caught it! You can also, as you're probably aware, catch long running queries, with the assumption that long queries also eat up CPU.

Below are some links that may be helpful, and are probably about as much as we can do without an understanding of specific situations:

http://forums.systeminetwork.com/isnetforums/showthread.php?t=48740

http://www.sqlthing.com/Resources/UsingQAQQINI.htm

http://www.ibmsystemsmag.com/i5/january04/administrator/8515p1.aspx

HTH,


Joe Sam

Joe Sam Shirah - http://www.conceptgo.com
conceptGO - Consulting/Development/Outsourcing
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----- Original Message ----- From: "Paul Holm" <pholm@xxxxxxxxxxxxxxxxx>
To: <java400-l@xxxxxxxxxxxx>
Sent: Tuesday, May 20, 2008 1:18 PM
Subject: JDBC: SQL CPU Issue

Hi All,



We have some situations where some large SQL and SQL Join statements can
take up 95%+ of System I CPU which affects everyone else on the system.

I understand we can optimize the SQL and will be doing so but for AD HOC
scenarios where users are creating their OWN queries we need a way to
basically say:



“Don’t let this JDBC job take more than 15% of CPU”. We have looked at the
QAQQINI performance file but that doesn’t seem to solve the problem. Any
insight or advice?



Thanks, Paul Holm



Develop Web Applications in Minutes!

www.planetJavaInc.com

760-432-0600




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