Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> RE: Heisenberg and measurement intrusion....

RE: Heisenberg and measurement intrusion....

From: Allen, Brandon <Brandon.Allen_at_OneNeck.com>
Date: Tue, 31 Jul 2007 13:20:23 -0700
Message-ID: <04DDF147ED3A0D42B48A48A18D574C45071FE168@NT15.oneneck.corp>


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."

Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.

--
http://www.freelists.org/webpage/oracle-l
Received on Tue Jul 31 2007 - 15:20:23 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US