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Message Posted: Wed, 25 Jan 2012 @ 15:08:09 GMT

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Subj:   Re: Performance Metrics: What explains this kind of observation?
From:   Gorner, Tomas


You don't give a lot of information, so just a blind shot - consider skew (both disk and CPU) of your tuned query. You can have an overall reduction in the metrics, but what a hack, if all the work is done by 1 AMP?

As for your second question - it depends. The execution time of a skewed query may change dramatically depending on overall workload. So, a query that consumes more CPU/IO/spool, but is balanced, would be probably more steady when it comes to a load/execution_time ratio.



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