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optimizer time reported as?

optimizer time reported as?

2006-01-11       - By Jonathan Lewis
Reply:     1     2     3     4     5     6     7     8     9     10  


When the query was taking 10 minutes to parse,
did anyone check to find out how many join
orders were examined in each query block ?

I'd be interested to find out whether it was the
number of join orders, or whether the problem
was actually something completely different.


Regards

Jonathan Lewis

http://www.jlcomp.demon.co.uk/faq/ind_faq.html
The Co-operative Oracle Users' FAQ

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Public Appearances - schedule updated 10th Jan 2006

-- -- Original Message -- --
From: "John Kanagaraj" <john.kanagaraj@(protected)>
To: <mark.powell@(protected)>; <oracle-l@(protected)>
Sent: Wednesday, January 11, 2006 10:23 PM
Subject: RE: optimizer time reported as?


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 **




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