RE: 9i Parsing Optimization
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
- To: <Brandon.Allen@xxxxxxxxxxx>, "Polarski, Bernard" <Bernard.Polarski@xxxxxxxxxxxxxx>, <anjo.kolk@xxxxxxxxxxx>, <ax.mount@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 31 Aug 2006 12:31:52 -0400
Right, session_cached_cursors can have an impact in reducing the amount
of work a parse does, but, any time a piece of client code makes a parse
call, Oracle MUST parse. It may be a hard parse, a soft parse, or a
session cursor cache hit, but it is a parse, none the less. The *ONLY*
way to reduce parsing is to change the program to parse less.
As others speculated previously, perhaps there's an ODBC or JDBC driver,
or something, that has an optimization that reduces the number of parse
calls, that was picked up on the upgrade from 8i to 9i.....
-Mark
--
Mark J. Bobak
Senior Oracle Architect
ProQuest Information & Learning
"A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders, give
orders, cooperate, act alone, solve equations, analyze a new problem,
pitch manure, program a computer, cook a tasty meal, fight efficiently,
die gallantly. Specialization is for insects." --Robert A. Heinlein
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Allen, Brandon
Sent: Thursday, August 31, 2006 12:17 PM
To: Polarski, Bernard; anjo.kolk@xxxxxxxxxxx; ax.mount@xxxxxxxxx;
oracle-l@xxxxxxxxxxxxx
Subject: RE: 9i Parsing Optimization
If I understand correctly, session_cached_cursors causes a "softer"
parse, but a parse would still show up as a parse in the 10046 output so
I don't believe this parameter could be responsible for the 50%
reduction in parse count. Someone please correct me if I'm wrong.
________________________________
From: Polarski, Bernard [mailto:Bernard.Polarski@xxxxxxxxxxxxxx]
Sent: Thursday, August 31, 2006 2:37 AM
In the upgrade process, did you changed 'session_cached_cursors' from 0
(default in 8i) to something like 50+?
In this case your hits are much better and there is less pression on the
shared pool, hence your parsing decrease also.
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