RE: optimizer time reported as?

From: Powell, Mark D <mark.powell_at_eds.com>
Date: 2006-01-11 22:10:45
Message-id: 5A14AF34CFF8AD44A44891F7C9FF410505EA58DE@usahm236.amer.corp.eds.com

I remember the default on 8.1.7 being 80,000 and Oracle support had us lower it to 2,000 while we were working on an ORA-04031 iTAR.  

ora817 > @mon/parms

'For all columns: Y = Yes/True    N = No/False '

' D = Deferred, I = Immediate, S = System, U = User session'
' Default indicator is unreliable if col SYS indicates chg '
Enter value for parameter: optimizer_max_permutations  

                                                                    D S
S M A
                                                                    e e
y o d
NAME                            VALUE                               f s

s d j

------------------------------- ----------------------------------- - -

- - -
DESCRIPTION

---

optimizer_max_permutations      80000                               Y Y

N N N
optimizer maximum join permutations per query block  

So how did the performance test turn out?  

HTH -- Mark D Powell --

---

        From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Wolfson Larry - lwolfs

	Sent: Wednesday, January 11, 2006 4:01 PM
	To: oracle-l_at_freelists.org
	Subject: optimizer time reported as? 
	
	
	I got asked about performance on a database that was recently

upgraded from 8.1.7.4 to 9.2.0.6.          

	Looking at the initora I noticed
	optimizer_max_permutations           integer

79999          

            The DBA doing the upgrade said she only changed the parmaeters relating to the upgrade.

        I know the default changed from 8's 80000 to 9's 2000 and there was an earlier TAR telling us to change the

        80000 to 79999.          

            I thought this might be an issue and I ran Tim Gorman's sp_time script to see where the overhead was.

        I just wanted to verify that the optimizer_max_permutations time is accounted for in the

        Parsing SQL time and not somewhere else.                    

	    TIA
	    Larry Wolfson
	    
	
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* Received on Wed Jan 11 2006 - 22:10:45 CST