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 Paging in 300 pages/sec and perf degradation

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WS593
Starting Member

6 Posts

Posted - 2008-12-18 : 13:35:06
Hi, Windows 2003 SP1, SQL 2005 SP2 Standard edition, 16 processors, 32 GB ram (SQL set at min 10GB max 26GB. Around lunch time, we have a severe app performance degradation for about 10 minutes. Using Idera DM, all we see in red is paging. We cruise around 300 pages/sec. We can't find the roor cause. I don't understand why we even have paging going on with so much memory allocated.
Any advise wouldl be greatly appreciated. Thank you.

tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2008-12-18 : 13:37:53
Do you have the "lock pages in memory" set?

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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WS593
Starting Member

6 Posts

Posted - 2008-12-18 : 14:48:06

Yes we do.

quote:
Originally posted by tkizer

Do you have the "lock pages in memory" set?

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2008-12-18 : 14:59:55
Has it been determined what process is causing, such as SQL Server's executable or some other process? You can view it from within Performance Monitor.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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WS593
Starting Member

6 Posts

Posted - 2008-12-18 : 15:06:53
Not yet and that is my concern. We are approaching the critical time of the day (between noon aand 1 pm) I will monitor closely with perf monitor and report back here. Thank you for your help.

quote:
Originally posted by tkizer

Has it been determined what process is causing, such as SQL Server's executable or some other process? You can view it from within Performance Monitor.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2008-12-18 : 15:19:08
What size is your page file? With 32GB of memory, I believe it's recommended to have a 48GB page file at a minimum.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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WS593
Starting Member

6 Posts

Posted - 2008-12-18 : 15:28:39
Good point. I checked and it is 48GB Thank you

quote:
Originally posted by tkizer

What size is your page file? With 32GB of memory, I believe it's recommended to have a 48GB page file at a minimum.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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sodeep
Master Smack Fu Yak Hacker

7174 Posts

Posted - 2008-12-18 : 22:07:35
I guess you can't set 'lock pages in memory' in standard edition or it doesn' t have any effect at all.
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WS593
Starting Member

6 Posts

Posted - 2008-12-19 : 10:05:03
I think sodeep is right. It is set but I read somewhere that it is only for enterprise edition. I heard that upgrading to enterprise edition would be very expensive because the box has 16 processors. Is that true? Thank you all for your input.

quote:
Originally posted by sodeep

I guess you can't set 'lock pages in memory' in standard edition or it doesn' t have any effect at all.

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tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2008-12-19 : 11:02:35
Well Enterprise Edition CPU licenses is expensive, but Enterprise Edition server licenses isn't. It just depends on your requirements. We run Enterprise Edition CPU licenses due to our products being on the Internet and also because of the features of Enterprise Edition.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
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sodeep
Master Smack Fu Yak Hacker

7174 Posts

Posted - 2008-12-19 : 11:33:07
quote:
Originally posted by WS593

I think sodeep is right. It is set but I read somewhere that it is only for enterprise edition. I heard that upgrading to enterprise edition would be very expensive because the box has 16 processors. Is that true? Thank you all for your input.

quote:
Originally posted by sodeep

I guess you can't set 'lock pages in memory' in standard edition or it doesn' t have any effect at all.





It doesn' t advantages of it in STD Edition?
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Michael Valentine Jones
Yak DBA Kernel (pronounced Colonel)

7020 Posts

Posted - 2008-12-19 : 11:47:48
You need to determine if paging is really the problem. Paging does not always mean that data is being moved from memory to the page file or from the page file to memory.

There are many kinds of paging that will not cause any problem. For example, when you run backups, you will see paging as the OS allocates pages for the file system cache.




CODO ERGO SUM
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WS593
Starting Member

6 Posts

Posted - 2008-12-19 : 13:28:27
Point well taken. Thank you all for your help. BTW This is the best SQL forum out there.

quote:
Originally posted by Michael Valentine Jones

You need to determine if paging is really the problem. Paging does not always mean that data is being moved from memory to the page file or from the page file to memory.

There are many kinds of paging that will not cause any problem. For example, when you run backups, you will see paging as the OS allocates pages for the file system cache.




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