Average response time

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Hi List,

I am trying to calculate the average database response time for a data center audit currently underway. Without "expensive" monitoring tools, is it possible to determine this from database statistics. So far, I'm using
(Service Time + Wait Time) / calls where this translates into

Service Time = 'CPU used by this session' from v$sysstat Wait Time = sum(time_waited) from v$system_event (excluding idle events)
User calls = 'user calls' from v$sysstat

Am I way off the mark here?

Interestingly, it seems as if Craig Shallahamer (www.orapub.com) is preparing a paper which addresses this very issue - determing response time from database statistics - but it is only due out later this year.

Anybody with any ideas or reasons why the above is not feasible?

TIA
Paul

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