Poor Man's Enterprise Feature - Lock Pages in Memory

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Poor Man's Enterprise Feature - Lock Pages in Memory

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Amit Singh

Posted Wednesday, October 14, 2009 9:06 PM

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Comments posted to this topic are about the item Poor Man's Enterprise Feature - Lock Pages in Memory

-------------------------------------------------
-Amit
Give a man a fish and he'll ask for a lemon. Teach a man to fish and he wont get paged on weekends !! w00t

- desparately trying to fish

Post #803211

ta.bu.shi.da.yu

Posted Thursday, October 15, 2009 6:00 AM

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All the Microsoft links point to info about the 64-bit versions of Windows. Is this feature restricted to this platform?

Random Technical Stuff

Post #803361

GilaMonster

Posted Thursday, October 15, 2009 6:16 AM

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ta.bu.shi.da.yu (10/15/2009)

All the Microsoft links point to info about the 64-bit versions of Windows. Is this feature restricted to this platform?

No, but it tends to be most useful (and most necessary) on 64 bit.

On 32 bit, Lock pages is required to use AWE.

Gail Shaw
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Post #803376

Steve Vassallo

Posted Thursday, October 15, 2009 9:21 AM

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What about SQL 2008? Is this an option there?

Post #803537

alen teplitsky

Posted Thursday, October 15, 2009 9:34 AM

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we had this when we first went to x64 and there was almost nothing on the internet to document the differences except a MSDN blog post by a Microsoft developer who now works in another department.

we ended up enabling it and all the problems went away. Funny thing is that out of our 3 main servers we only saw the problem on one of them. even on the server that does a lot of huge batch processing we didn't see this. the problem server was tens of millions of queries daily all with different parameters and variables

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Post #803547

GilaMonster

Posted Thursday, October 15, 2009 9:37 AM

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Steve Vassallo (10/15/2009)

What about SQL 2008? Is this an option there?

Yes.
SQL 2008 SP1 CU2 allows locked pages on standard edition. Good reference for this topic is the PSS Engineers' blog
http://blogs.msdn.com/psssql/archive/2009/05/19/an-update-for-standard-sku-support-for-locked-pages.aspx

Gail Shaw
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Post #803551

george sibbald

Posted Thursday, October 15, 2009 9:44 AM

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the definitive blog on this:

http://blogs.msdn.com/psssql/archive/2009/09/11/fun-with-locked-pages-awe-task-manager-and-the-working-set.aspx

which has a link to blog Gail posted..................

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Post #803562

wasntme

Posted Thursday, October 15, 2009 2:59 PM

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according to microsoft this is supprtedin standard 32 bit edition prior to sp3cu4

i have seen the errors you get in the log when you need to add the lock pages in mem policy to the id running sql server and adding stopped the error messages. this is for 32 biut standard edition. i am not so sure I believe any of this blog.

Locked pages in memory operating system (OS) privilege (Allows locking physical memory, preventing OS paging of the locked memory.)4
SQL Server Standard, Enterprise, and Developer editions: Required for SQL Server process to use AWE mechanism. Memory allocated through AWE mechanism cannot be paged out.

Granting this privilege without enabling AWE has no effect on the server.

http://technet.microsoft.com/en-us/library/ms187499(SQL.90).aspx

Post #803787

Paul White

Posted Friday, October 16, 2009 9:45 AM

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ta.bu.shi.da.yu (10/15/2009)

All the Microsoft links point to info about the 64-bit versions of Windows. Is this feature restricted to this platform?

The problem only affects 64-bit Standard Edition.

In 32-bit Standard Edition, we could grant 'lock pages in memory' and enable AWE to lock buffer pool pages.
In 64-bit Standard Edition, prior to SP3 CU4 (2005) or SP1 CU2 (2008), there was no way to achieve the same effect.

This was a shocking omission by Microsoft - it is a shame it has taken them so long to correct it. Using a trace flag to enable it seems overly conservative: a trace flag to disable it would seem more sensible, but never mind.

Not sure why anyone should regard this as more useful or necessary on 64-bit systems (which tend to have more memory, if anything) compared to 32-bit systems, but hey.

Paul White
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Post #804321

Jeff Moden

Posted Friday, October 16, 2009 1:09 PM

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Heh... wouldn't a reasonable alternative be to only have SQL Server on the SQL Server box? Wink

--Jeff Moden

"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

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