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SQL Instance Memory Allocation Expand / Collapse
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Posted Thursday, October 31, 2013 4:43 AM


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Hi All,

I have a 64bit server with 128Gb RAM installed and I am planning on putting a default instance of sql 2008r2 Standard Edition on it. I additionally intend to add a named instance as well on that server. I know that SQL 2008R2 SE is limited to 64Gb RAM but can the usage of 2 instances utilise all of the RAM available or will it have to share 64Gb?

Thanks in advance

EH


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Post #1510104
Posted Thursday, October 31, 2013 4:50 AM


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According to Brent Ozar's blog (in the comments) it's 64GB per instance. But you should read his reply to that comment.

http://www.brentozar.com/archive/2010/06/sql-server-r-standard-supports-less-memory/

EDIT: You should also consider what will happen to the OS if you're using 2 instances that gobble up the rest of the server's RAM.


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Post #1510107
Posted Thursday, October 31, 2013 4:58 AM


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Thanks for the response Brandie - The named instance is to be used as a warm standby for DR, so there is no real performance concerns as the default instance will be switched off if required

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Post #1510109
Posted Thursday, October 31, 2013 5:01 AM


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I don't advise using the same server for a warm standby of your primary database. If you lose the server, you lose both the primary and the stand by.

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Post #1510110
Posted Thursday, October 31, 2013 7:29 AM


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The DR is not for the same server - It's a warm standby of another server but always worth mentioning for others reading the post. It wouldn't really meet the DR requireements if it was on the same one.

Thanks


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Post #1510165
Posted Thursday, October 31, 2013 7:53 AM


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In that case, I'd make sure you have enough RAM for both instances to be up (when the other server fails) and still be able to run the OS, etc. RAM is cheap and CYA is good.

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Post #1510185
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