Procedure Cache Hit Rate

Feb 9, 2007

I have installed a SQL Server diagnose tool for evaluation. It prompts and warns me that "Procedure Cache hit rate is for example 15%. Its help indicates:

The Procedure Cache Hit Rate alarm is raised when the ratio between the number of times SQL Server looks for a plan in the procedure cache and the number of times it does not find a required plan in the procedure cache falls below a threshold.

A low procedure cache hit rate indicates that SQL Server is finding fewer of the query execution plans it needs already in memory and therefore has to perform more compiles. These extra compilations will degrade SQL Server performance by causing extra CPU load.

What can I do to increase the rate?

Canada DBA

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Procedure Cache Hit Rate Is Low - Need Advice

Mar 18, 2008

I have a 32 bit SQL 2005 EE clustered installation with 10GB of physical memory and AWE enabled. Our monitoring tool, Spotlight, is reporting the Procedure Cache to be 384MB and a Hit Rate of 75% on a fairly regular basis. Sometimes the Procedure Cache increases to 495MB and a Hit Rate of 82%.

(1) With 2005 can the Procedure Cache be increased?

(2) What is the max size of Procedure Cache?

(3) How do I increase the Hit Rate to a higher percentage?

I do not encounter the issue on any other SQL Server installation, however this is our only cluster.

DBCC PROCCACHE
num proc buffs = 64889
num proc buffs used = 1135
num proc buffs = 1135
active proc cache size = 2896
proc cache used = 364
proc cache active = 364

Thanks, Dave

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