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 Session CPU wait times
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Posting Yak Master

112 Posts

Posted - 11/07/2012 :  08:32:58  Show Profile  Reply with Quote
Hi all,

We have a lightly-used OLTP system, split across 3 clusters, that is showing 6 sessions with wait times often in hundreds, or thousands of seconds.

They are not causing performance complaints but ARE causing alerts to fire in our monitoring system (Idera). I would be grateful for any ideas to begin addressing the underlying issue, as well as rationalising the alerts (ie possibly by increasing the 'critical' point where an email is sent to 10,000secs).

Many thanks,


Flowing Fount of Yak Knowledge

United Kingdom
2173 Posts

Posted - 11/07/2012 :  09:46:33  Show Profile  Visit jackv's Homepage  Reply with Quote
1)Try extracting the queries which are running at the time. This could give you some clues. Analyse the queries execution plans and see if there is an heavy CPU based activity.
2) Using a query over sys.dm_os_wait_stats check for : SOS_SCHEDULER_YIELD, THREADPOOL, CX_PACKET , usually related the CPU

Jack Vamvas
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