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 Thanks, 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 -- 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. DISCLAIMER: "The information in this e-mail and any attachment is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received this e-mail in error, kindly contact the sender and destroy all copies of the original communication. IBS makes no warranty, express or implied, nor guarantees the accuracy, adequacy or completeness of the information contained in this email or any attachment and is not liable for any errors, defects, omissions, viruses or for resultant loss or damage, if any, direct or indirect."