RE: optimizer_max_permutations

  • From: Jared.Still@xxxxxxxxxxx
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Thu, 4 Mar 2004 14:02:09 -0800

... and the default for optimizer_features_enable is 9.2






Thomas Jeff <jeff.thomas@xxxxxxxxxxx>
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
 03/04/2004 10:26 AM
 Please respond to oracle-l

 
        To:     "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
        cc: 
        Subject:        RE: optimizer_max_permutations


Actually, the default is 2000 in 9.2.0.4 only if optimizer_features_enable 
is set to 9.2. 
Set optimizer_features_enable back to 8.1.7 and permutations will default 
to 80000.
-----Original Message-----
From: Jared.Still@xxxxxxxxxxx [mailto:Jared.Still@xxxxxxxxxxx] 
Sent: Wednesday, March 03, 2004 7:04 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: optimizer_max_permutations


As the default value on 9.2.0.4 is already 2000, I don't think you will 
see much difference. 

Jared 





<ryan.gaffuri@xxxxxxx> 
Sent by: oracle-l-bounce@xxxxxxxxxxxxx 
 03/03/2004 03:34 PM 
 Please respond to oracle-l 
        
        To:        oracle-l@xxxxxxxxxxxxx 
        cc:         
        Subject:        optimizer_max_permutations



I've been talking to Oracle Support about some performance problems and 
they told me to set optimizer_max_permutations=2000

Has anyone tested how this effects the CBO? This is on 9.2.0.4 on Solaris. 


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