RE: Heisenberg and measurement intrusion....

That depends on exactly what you mean by "monitoring"? If you're just talking about taking a snapshot (e.g. with statspack) before and after the baseline, then there isn't any overhead during the monitored period. If you're talking about monitoring by constantly running queries against v$sql, v$session, v$sesstat and running sar, iostat, vmstat, etc. during the baseline, then those could certainly have an impact on the performance so they should either be eliminated or accounted for. It also depends on if your "monitoring" is a constant, integral part of the environment (e.g. 10g AWR/ASH/ADDM), in which case it shouldn't be eliminated during your baseline, or if your monitoring is some ad-hoc utilities and queries that you only run under certain circumstances.

Regards,
Brandon

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Ted Coyle

Is the statement below accurate?
"So the Heisenberg uncertainty principle mandates we run without monitoring as a baseline."

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