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Question about AWR [message #404476] Thu, 21 May 2009 23:03 Go to next message
orausern
Messages: 826
Registered: December 2005
Senior Member
Hi,

I have the following question about AWR report
In the instance efficiency section , this ratio is there : % Non-parse CPU. I am not clear what it means. I tried googling it for its definition and also search the oracle documentation but do not find any definition for it.

Thanks

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Re: Question about AWR [message #404477 is a reply to message #404476] Thu, 21 May 2009 23:12 Go to previous messageGo to next message
BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal
Senior Member
>In the instance efficiency section , this ratio is there : % Non-parse CPU.
It takes CPU cycles to parse SQL statements.
So CPU cycles can be classified as parsing CPU cycles & non-parse CPU cycles.
It is inefficient to have high parse CPU cycles, because this would mean the CPU is spending lots of time parsing SQL as opposed to actually processing parsed SQL statements.

Therefore in a well tuned application you want high % Non-parse CPU

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Re: Question about AWR [message #404480 is a reply to message #404477] Thu, 21 May 2009 23:28 Go to previous message
orausern
Messages: 826
Registered: December 2005
Senior Member
Thank you very much BlackSwan.

One more doubt: in the AWR there is also a section on SQL with multiple versions. I do not know why a sql should have multiple versions. Can you explain? - One reason I know is: if the same sql refers to a different schema (multiple schema having same structure). Is there some other reason?

Thanks

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