HIT and MISS

[kmounkhaty]

Hi Guru,

My profiler trace does not display SP:CACHEMISS event, even thought I
drop store proc, clear both data cache and buffer cache but still does
not work.

Every thing works fine like: cachehit,
cacheinsert,cacheremove,executecontexthit etc...

Is there any special option that I need to turn it on?

Please help,

Thanks,
Silaphet,

[Erland Sommarskog]

[posted and mailed, please reply in mail]

km********@yahoo.com (sm********@bremer.com) writes:

My profiler trace does not display SP:CACHEMISS event, even thought I
drop store proc, clear both data cache and buffer cache but still does
not work.

Every thing works fine like: cachehit,
cacheinsert,cacheremove,executecontexthit etc...

Is there any special option that I need to turn it on?

This is in fact a very common event in many systems - and far more common
that it have to be.

Create a stored procedure demo_sp as dbo, and grant exec rights to some
other non-priv user. Then log in as that user, and run the procedure
as "EXEC demo_sp". You will get a CacheMiss every time!

This is because SQL Server first looks up if the user owns a procedure
named demo_sp, in which case this is the one to be executed. There isn't
one, and whence the cache miss.

If you instead say "EXEC dbo.some_sp", you will not get the cache miss,
and this is good for overall performance of the system. Thus it is good
practice to specify "dbo." when you call stored procedures.
--
Erland Sommarskog, SQL Server MVP, es****@sommarskog.se

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