AAS & the maximum CPU line
Hi All
For a while now I've used Oracle's Average Active Sessions metric compared against the CPU count for the database server to give me a quick health check on the database and very useful it is too. One thing that's confused me somewhat is why is the AAS metric is compared against the number of CPUs on the server to indicate ANY DB performance problem, I think I might know the reason for this but was never sure. My guess is that if database was suffering due to lack of memory or disk I/O issues then this would quickly lead to high CPU usage either due to swapping/paging activity for lack of memory or for CPUs in I/O wait status for slow disks but is this correct? Oracle Enterprise manager nicely shows you the wait class / event that makes up a figure of a high AAS load in the graphs so it's tells you what the issue is. For example, if the AAS load was nearly all down to User I/O then it confuses me slightly why you recognise this is a problem when the AAS figure passes the max CPU line, is it just down to the subsequent CPU utilisation that results from the root cause?
Thanks
Steve
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