Re: CPU Per Exec - SQL Ordered By CPU Time
- From: Oracle Dba Wannabe <oracledbawannabe@xxxxxxxxx>
- To: oracledbawannabe@xxxxxxxxx, "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>, "harel.safra@xxxxxxxxx" <harel.safra@xxxxxxxxx>
- Date: Wed, 24 Nov 2010 10:29:17 -0800 (PST)
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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