100% CPU utilisation

Question

100% CPU utilisation

chandu.ade

Mr or Mrs. 500

Points: 538
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October 6, 2009 at 8:37 am

#385513

Hi,
I have a single duel core CPU with 4 GB RAM Windows2003SP2 with SQL2005SP2. After applying SP2 for SQL the CPU utilisation is going to 100%. SQL Server is taking all the CPU and application timeout is occuring. Please suggest

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Silverfox SSC-Insane Points: 23150 More actions · Answer 1

chandu.ade (10/6/2009)
Hi,
I have a single duel core CPU with 4 GB RAM Windows2003SP2 with SQL2005SP2. After applying SP2 for SQL the CPU utilisation is going to 100%. SQL Server is taking all the CPU and application timeout is occuring. Please suggest

Can you give more details, as in what else is running on the server at this time and is it at 100% cpu constantly or spiking at 100%. have you looked at what queries/jobs are running on the server, or have you looked at the performance dashboard.

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Steve Jones - SSC Editor SSC Guru Points: 736063 More actions · Answer 2

CPU utilization can go to 100% in normal operation. The thing you need to trace and determine is which queries are causing that. You can tune those, or better isolate what might have changed.

chandu.ade Mr or Mrs. 500 Points: 538 More actions · Answer 3

Hi All,

Thanks lot for your quick reply. Basically without any load SQL Server engine is taking 99% CPU. We have applied SP2 recently. For 3/4 days it was working fine. There is no change in the application code.

Please let me know if required more information.

Regards,

Chandu

Steve Jones - SSC Editor SSC Guru Points: 736063 More actions · Answer 4

No load meaning no activity at all? If so that's a bug and you should contact MS. However I have seen many, many SP2 installations with no issues.

Grant Fritchey SSC Guru Points: 398872 More actions · Answer 5

You should be able to see the operations that are taking so much CPU within SQL Server. If nothing else, take a look at sys.dm_exec_requests to see what operations are currently running on the server. You can see the start time, elapsed time, and for your needs, cpu_time of the currently operating queries to see which ones are causing the trouble.

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wosscr Old Hand Points: 389 More actions · Answer 6

Hey guys,

I am experimenting the same problem, my CPU is at 100% and according with the task manager is being caused by SQL Server, I can see the cpu_time with the sys.dm_exec_requests but I want to know what queries are causing that too.. how can I detect those queries?

Thanks

chandu.ade Mr or Mrs. 500 Points: 538 More actions · Answer 7

Hi,

It was a problem of service pack. So we reverted that. Have you applied service pack like my case.

Please let me know the senario in detail to get the better workaround.