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Memory settings in SQL SERVER


Memory settings in SQL SERVER

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santhosh411
santhosh411
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I have 4GB Ram on OS and What will happen to my SQL server if i configure Min memory settings more than OS RAM that is 5GB and Max memory settings 6GB on SQL Server Memory settings.
GilaMonster
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Since SQL will never be able to reach 5GB (and hence the min server memory setting will never take effect), nothing different to the default setting (where max server memory is a couple thousand terabytes)

Gail Shaw
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SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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durai nagarajan
durai nagarajan
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We have only 2005 test server for us , so i tried on strange it is accepting the value.

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Durai Nagarajan
GilaMonster
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Why wouldn't it accept the value?

If you check books online, max server memory must be a value between 16 and 2147483647, min server memory must be a value between 0 and 2147483647. The values you set are within that range, so they're valid.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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santhosh411
santhosh411
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Is any issues with performance and if my SQL server is running state and configured SQL with min5GB and Max 6GB and the windows team suddenly decreed OS memory from 7GB to 4GB what will happen to SQL Server.
durai nagarajan
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But why not they check OS Memory before accepting it?

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Durai Nagarajan
GilaMonster
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santhosh411 (9/3/2013)
Is any issues with performance and if my SQL server is running state and configured SQL with min5GB and Max 6GB and the windows team suddenly decreed OS memory from 7GB to 4GB what will happen to SQL Server.


I already explained how it'll work. After SQL restarts (after the memory removal), it can't reach 5GB so the min server memory will never take effect. If the decrease in memory is permanent, you should go back and change the memory settings, but it'll be no different from a server with the default memory configuration of max server memory being 2000 or so TB.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
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GilaMonster
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durai nagarajan (9/3/2013)
But why not they check OS Memory before accepting it?


Why should it?

How does SQL know that I'm not setting max server memory higher then going home while the server admin adds more memory? Or the VM admin configures more memory, etc?

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
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santhosh411
santhosh411
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Thank you!
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