Oracle-L: RE: Poor performance after moving Extempore database from 7.3.4 to 8.1.7

From: Smith, Ron L. <rlsmith_at_kmg.com>
Date: Mon, 11 Aug 2003 12:24:23 -0800
Message-ID: <F001.005CA212.20030811122423@fatcity.com>

The old and new versions were both set to CHOOSE. Both are analyzed. Are you saying 8.1.7 handles this differently?

Thanks!
Ron

-----Original Message-----

Sent: Monday, August 11, 2003 3:04 PM
To: Multiple recipients of list ORACLE-L to 8.1.7

RBO, CBO, the old story. If you plan to continue using 8.1.7 for a While, then set the parameter OPTIMIZER_MODE to RULE. Your performance will be normal again and programmers will be able to override the parameter By specifying any hint except /*+ RULE */. Before switching to CBO, please read the article about the intelligent life in the optimizer. The article
itself is a good one (thanks, Tim) but reading the book from JL (Jonathan
Lewis, not Jeniffer Lopez) wouldn't hurt, either.

--

Mladen Gogala
Oracle DBA

-----Original Message-----

Smith, Ron L.
Sent: Monday, August 11, 2003 3:14 PM
To: Multiple recipients of list ORACLE-L 8.1.7

We recently upgraded an application (Extempore) database from Oracle 7.3.4 to 8.1.7. The clients say the test database, still on Oracle 7.3.4 is much faster than the production database, now on 8.1.7. The server is newer and faster on the production database. The Oracle init parameters are pretty much identical.

When I access the database through SQL*PLUS or TOAD, the response is instantaneous. The app uses an ODBC connection which is also 8.1.7. I have tried attaching the tables in MS Access through ODBC. This too is instantaneous.

Any ideas?

Ron Smith
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--

Author: Smith, Ron L.
INET: rlsmith_at_kmg.com

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Author: Mladen Gogala
INET: mladen_at_wangtrading.com

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Author: Smith, Ron L.
INET: rlsmith_at_kmg.com

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