Re: CPU Per Exec - SQL Ordered By CPU Time

which turns out to be a bug for my platform hp-ux.




________________________________
From: Oracle Dba Wannabe <oracledbawannabe@xxxxxxxxx>
To: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>; "harel.safra@xxxxxxxxx" 
<harel.safra@xxxxxxxxx>
Cc: "Oracle-L@xxxxxxxxxxxxx" <Oracle-L@xxxxxxxxxxxxx>
Sent: Wed, November 24, 2010 11:19:46 PM
Subject: Re: CPU Per Exec - SQL Ordered By CPU Time


I cant actually tell, during both peak and non peak intervals the statistic 
os_cpu_wait_time has a value of ############# during both intervals




________________________________
From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
To: "harel.safra@xxxxxxxxx" <harel.safra@xxxxxxxxx>; 
"oracledbawannabe@xxxxxxxxx" <oracledbawannabe@xxxxxxxxx>
Cc: "Oracle-L@xxxxxxxxxxxxx" <Oracle-L@xxxxxxxxxxxxx>
Sent: Wed, November 24, 2010 11:03:26 PM
Subject: RE: CPU Per Exec - SQL Ordered By CPU Time

 
Do you see an increase in os_cpu_wait_time during the same interval?  You can 
check this in the AWR report, or get current values directly in v$osstat.
 
 
From:oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Harel Safra
Sent: Wednesday, November 24, 2010 10:46 AM
To: oracledbawannabe@xxxxxxxxx
Cc: Oracle-L@xxxxxxxxxxxxx
Subject: Re: CPU Per Exec - SQL Ordered By CPU Time
 
It probably includes the time the process was in the run queue but not on the 
CPU itself (cpu wait).
Do you have matching OS statistics for the peak load? I'd look at CPU 
utilization and run queue length.

Harel Safra

On 24/11/2010 19:03, Oracle Dba Wannabe wrote: 
Hi,
With reference to AWR reports, during non peak and peak times I see the 
following:
Non Peak:
CPU Time (s) Elapsed Time (s) Executions  CPU per Exec (s) % Total DB Time SQL 
Id 

 
 
1,092 1,337 28,730 0.04 6.51 3kmnk9f1htbcc 
 
 

Peak:
CPU Time (s) Elapsed Time (s) Executions  CPU per Exec (s) % Total DB Time SQL 
Id 

 
 
4,679 15,653 29,922 0.16 6.05 3kmnk9f1htbcc 
 
 

I'm wondering what would cause the CPU per Exec to be greater during the Peak 
time? I understand that its CPU Time/Executions. 

Does CPU time include wait for CPU time too? which would mean during the peak 
time since the system was overloaded or CPU bound we would expect to see CPU 
per 
exec increase for the same statement?
Thanks
 
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