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TNS:packet writer failure
see ORA-12699
missing right parenthesis
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RE: optimizer time reported as?

John Kanagaraj

2006-01-11

Replies:
Note that in 10g, this parameter is hidden (becomes
"_optimizer_max_permutations"), and the value is defaulted to 2000.

Oracle seems to have noticed that the large default value in 8i was
probably incorrect. At least for Oracle's E-Biz Suite (Apps 11i), even
that based on a 8i database, this value necessarily needs to be set to
2000. I had helped someone (albeit on an Apps database) debug a query
that took 10 mins to parse (and less than a min to execute!)- the
parameter was incorrectly set to default and the query parsed and
performed under a minute.

So go ahead and satisfy our curiousity... What did sp_time (or is it
sp_systime_<Version>,sql!) point to?

John Kanagaraj <><
DB Soft Inc
Phone: 408-970-7002 (W)

Co-Author: Oracle Database 10g Insider Solutions
http://www.amazon.com/exec/obidos/tg/detail/-/0672327910/

** The opinions and facts contained in this message are entirely mine
and do not reflect those of my employer or customers **


________________________________

From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Sent: Wednesday, January 11, 2006 1:11 PM
To: oracle-l@(protected)
Subject: RE: optimizer time reported as?


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@(protected)
[mailto:oracle-l-bounce@(protected) -
lwolfs
 Sent: Wednesday, January 11, 2006 4:01 PM
 To: oracle-l@(protected)
 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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