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Message from discussion Deadly OPTIMIZER_SECURE_VIEW_MERGING= TRUE
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Rick Denoire  
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 More options Dec 1 2007, 8:30 pm
Newsgroups: comp.databases.oracle.server
From: Rick Denoire <educacion.super...@online.de>
Date: Sun, 02 Dec 2007 02:30:36 +0100
Local: Sat, Dec 1 2007 8:30 pm
Subject: Deadly OPTIMIZER_SECURE_VIEW_MERGING=TRUE
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Hello

After Upgrading a commercial application from 9.2.0.5 to 10.2.0.3 we
got a disastrous performance, even though the new server was at least
10 times faster (in terms of CPU). The application manager did not
follow test procedures prior to the upgrade, which lead us to a
crisis.

After some investigation I found that just setting the following
parameter resulted in a huge (about 100-fold) performance increase:
OPTIMIZER_SECURE_VIEW_MERGING=FALSE

See for example:
http://www.freelists.org/archives/oracle-l/07-2006/msg00260.html

I did not dare to set any hidden parameters yet; perhaps those would
have boosted performance even more.

Can you confirm that reverting mentioned parameter to the non-default
value (FALSE) improves performance so dramatically?

What is the rationale of such detrimental default value of the
initalization parameter that effectively renders the database
"misconfigured"?

Are there any other deadly preset parameters I should be aware of
after Upgrade to Oracle 10g, according to your experience?

Do you really recommend to let Oracle do things automatically? (SGA,
PGA, db_file_multibloc_read_count, etc.)

Thanks a lot

Rick Denoire


 
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