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OS cache in Sql Server


OS cache in Sql Server

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Bhuvnesh
Bhuvnesh
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Does Sql server use OS cache (outside buffer cache) for its operations ?

-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)
GilaMonster
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What exactly do you mean by 'OS cache'?

SQL uses memory outside of the buffer pool, but it's no the OS's memory, it's SQL's memory.

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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MikaS
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Hi,

OS System Cache is a subset of a Standby List. Standby List is used for pages that have not been touched for awhile and Windows performed memory trimming on them. Also when the process (like sqlservr.exe) is terminated the pages for the exe and the dll's have their pointers updated to point to the Standby List, so that they can be re-assembled from the cache.

Standby List is one of the four lists used by the OS to organize physical memory. They're used by the OS, services, applications etc, so in that regard it can be said that they're also used by the SQL Server Smile

Mika Sutinen, Senior DBA
@SQLFinn on Twitter
Blogging at SQLStarters
Bhuvnesh
Bhuvnesh
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MikaS (7/30/2014)
Hi,

OS System Cache is a subset of a Standby List. Standby List is used for pages that have not been touched for awhile and Windows performed memory trimming on them. Also when the process (like sqlservr.exe) is terminated the pages for the exe and the dll's have their pointers updated to point to the Standby List, so that they can be re-assembled from the cache.

Standby List is one of the four lists used by the OS to organize physical memory. They're used by the OS, services, applications etc, so in that regard it can be said that they're also used by the SQL Server Smile
thanks any areticle link ..actually i didnt find any.

-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)
GilaMonster
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Google for mark russinovich windows memory and you'll find a tonne of stuff. That's OS-level memory management though, not SQL's memory management.

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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