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Parameters changed in INIT.ora [message #65550] Mon, 25 October 2004 20:09 Go to next message
Milind Deshpande
Messages: 93
Registered: May 2004
Member
Hi All,

I have changed these parameters in my INIT.ora file I just wanted to know that changing these parameters can cause any performance degrade because I have changed it for a particular SQL statement. Will this change give me better performance for all SQL queries or there may be some performance degrade.

optimizer_index_caching=60     (Modifed by 99)



optimizer_index_cost_adj=20



optimizer_mode=first_rows

Kindly help me on this .

Thanks in Advance

Milind
Re: Parameters changed in INIT.ora [message #65553 is a reply to message #65550] Mon, 25 October 2004 22:03 Go to previous message
Frank
Messages: 7880
Registered: March 2000
Senior Member
Don't touch your db-parameters just to tune 1 query !!
If you have an otherwise good performing system, it is very likely you
a) ruin the rest of your performance by changing these parameters
b) have just 1 crappy query, which should by tuned by changing the QUERY !

If you need to ask what consequences there are: DO NOT TOUCH those parameters.

hth
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