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Use of Parallelism. Expand / Collapse
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Posted Wednesday, December 19, 2012 11:42 PM
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How can we use the parallelism in sql server. For the same query the exectuin plan at QA server the parallelism is being used. But It is not showing in Staging Server. What can be the reason behind that ?
Post #1398793
Posted Wednesday, December 19, 2012 11:48 PM


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The reasons can be related to available resources, number of records and/or server settings.

Are bother environments exactly the same? If not, then the same execution plan could happen but should not be expected.




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Post #1398794
Posted Wednesday, December 19, 2012 11:55 PM
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SQLRNNR (12/19/2012)
The reasons can be related to available resources, number of records and/or server settings.

Are bother environments exactly the same? If not, then the same execution plan could happen but should not be expected.



Yes, No of records in the table and environments are same. how can we resolve that ?
Post #1398797
Posted Thursday, December 20, 2012 12:10 AM


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And the server settings, are they the same?

Max Degree of parallelism and Cost Threshold for Parallelism for starters.





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Post #1398809
Posted Thursday, December 20, 2012 12:23 AM
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SQLRNNR (12/20/2012)
And the server settings, are they the same?

Max Degree of parallelism and Cost Threshold for Parallelism for starters.



Yes Both are same.....
Post #1398820
Posted Thursday, December 20, 2012 12:39 AM


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And which plan is it that you want to use?

Which plan is performing better?

Did you clear the cache before running your tests on both servers?


Both servers have same number of cpus, same affinity, same resource governor settings, same memory?

Both servers have advanced power management turned off in bios?




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Post #1398829
Posted Thursday, December 20, 2012 2:50 AM
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SQLRNNR (12/20/2012)
And which plan is it that you want to use?

Which plan is performing better?

Did you clear the cache before running your tests on both servers?


Both servers have same number of cpus, same affinity, same resource governor settings, same memory?

Both servers have advanced power management turned off in bios?


I want to use the execution plan which have the parallelism. It is working faster.
Both servers have same number of cpus, same affinity, same resource governor settings, same memory.

Post #1398878
Posted Thursday, December 20, 2012 2:55 AM
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SQLRNNR (12/20/2012)
And which plan is it that you want to use?

Which plan is performing better?

Did you clear the cache before running your tests on both servers?


Both servers have same number of cpus, same affinity, same resource governor settings, same memory?

Both servers have advanced power management turned off in bios?


I have checked the no of processor. QA server, where the parallelism is being used have th 2 processor. and staging server have the 4 processor, where the parallelism qry is not being used.
Post #1398880
Posted Thursday, December 20, 2012 8:23 PM


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Is advanced power management enabled in the bios on either machine?

Also, please submit actual execution plans for both servers. It will help us to troubleshoot.




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Post #1399161
Posted Friday, December 21, 2012 5:31 AM


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Have you updated your statistics recently on both databases? If statistics are up to date on one and not the other SQL Server can generate or pick different execution plans for the same query.

This too:

SQLRNNR (12/20/2012)
Also, please submit actual execution plans for both servers. It will help us to troubleshoot.


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