RE: Measure CPU utilization for a database

  • From: <Joel.Patterson@xxxxxxxxxxx>
  • To: <Sreejith.Sreekantan@xxxxxxxxxx>, <fmhabash@xxxxxxxxx>
  • Date: Wed, 6 Apr 2011 09:39:43 -0400

For a moment in time.

Also the % is an average over the last X minutes, whatever that is.   I think 
you will find that if you add up all the CPU % busy for each instance on the 
host, the will sum to greater than 100%.

To actually 'average' each instance across 24 hours is much harder in that the 
CPU for each instance can fluctuate a lot.  Batch processing at night is also a 
facter that will make the CPU fluctuate

Joel Patterson
Database Administrator
904 727-2546

From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Sreejith S Nair
Sent: Wednesday, April 06, 2011 8:44 AM
To: fmhabash
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Measure CPU utilization for a database

Since this figure comes from the snapshot values which my formula was derived 
from, Can we use the values which are stored in dynamic views as mentioned in 
my calculation?

With Regards,

Sreejith S Nair
Associate Systems Architect | AOS DBA Team

From:        fmhabash <fmhabash@xxxxxxxxx>
To:        Sreejith.Sreekantan@xxxxxxxxxx
Cc:        oracle-l@xxxxxxxxxxxxx
Date:        04/06/2011 06:09 PM
Subject:        Re: Measure CPU utilization for a database

Go after awr INSTANCE CPU PERCENTAGES: % of busy cpu for instance. This
gives you instance cpu as percent of total host cpu.

Thank you.


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