RE: SHOULD WE ANALYZE 9.2 SYS tables?
- From: "Lex de Haan" <lex.de.haan@xxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 29 Jul 2004 21:08:11 +0200
I must disagree here.
it is true that Oracle never actively encouraged customers to gather
statistics for the SYS schema in Oracle9i, but it certainly cannot ruin your
performance. Oracle also doesn't explicitly forbid you to gather DD
statistics. you have to go back further in time (Oracle8i) to get into
trouble with data dictionary statistics.
I discussed this with the optimizer development team (when I was still
inside Oracle) and they told me that there are no reasons at all *not* to
gather statistics on the SYS schema. In other words, feel free.
as you probably know, various Oracle9i DD views actually have hints in their
definitions, kicking in CBO anyway ...
Kind regards,
Lex.
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visit my website at http://www.naturaljoin.nl
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Juan Carlos Reyes
Pacheco
Sent: Thursday, July 29, 2004 19:42
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: SHOULD WE ANALYZE 9.2 SYS tables?
Hi Larry
SYS schema don't need be analyzed, using tom kyte's word "it's magical" and
must not be analyzed
if you got statistics in sys, you can ruin it's performance.
sys schema don't have to be touched, this means don't create user tables in
sys, etc.
Juan Carlos Reyes Pacheco
OCP
-------Original Message-------
From: oracle-l@xxxxxxxxxxxxx
Date: 07/29/04 14:25:41
To: 'oracle-l@xxxxxxxxxxxxx'
Subject: SHOULD WE ANALYZE 9.2 SYS tables?
I had a question about a problem with 9.2 V$ views where a RULE hint helped
V$LOCK tremendously.
Someone suggested Analyzing the SYS tables. IS everyone doing that now or
is there considerable reticence? I didn't get a much current information
when I searched the FAQ or Google
Has anyone experienced a downside?
Is anyone doing some of the tables but not all?
Thanks
Larry Wolfson
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