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Home -> Community -> Mailing Lists -> Oracle-L -> RE: View HELP Please!
Tom - Human grammar terms adapted to computer syntax :-)
http://www.student.math.uwaterloo.ca/~cs448/db2_doc/html/db2s0/frame3.htm#ch
2pred
Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Wednesday, February 12, 2003 1:24 PM
To: Multiple recipients of list ORACLE-L
Robert,
please excuse my ignorance, but what do you mean by "predicate"?
Tom Mercadante
Oracle Certified Professional
-----Original Message-----
Sent: Wednesday, February 12, 2003 1:39 PM
To: Multiple recipients of list ORACLE-L
Done that Dennis. The difference in the two is how the plan is being crafted by the optimizer. Bottom line is that the excellent plan I'm getting from the query by itself is not being replicated when it's moved into a view. It appears that this is because the predicate is not being pushed into the view properly. Since it's not, the view ends up just being a two table join with two full table scans who's row set is returned and then filtered. What I want is the predicate to be pushed into the view, which will allow for an index scan based on that predicate.
RF
-----Original Message-----
To: Multiple recipients of list ORACLE-L
Sent: 2/12/2003 9:53 AM
Robert - I always try EXPLAIN PLAN as a starting point.
Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Wednesday, February 12, 2003 9:19 AM
To: Multiple recipients of list ORACLE-L
I'm fighting a view.... Someone hand me a big dagger with which to kill
it.
I have a view that takes 6 minutes to run when I query it like this:
select
count(*) from TST_XVW a
where claim_carrier_key=41721;
Yet, if I take the SQL from the view, add the claim_carrier_key
predicate to
it, I get a run time of 6 seconds. I've tried several different hints
(push_pred, use_nl, etc) and I'm just not seeming to be able to get the
optimizer to give me a good plan. Any help on this would be appreciated.
Robert
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Freeman Robert - IL
INET: FREEMANR_at_tusc.com
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Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Wed Feb 12 2003 - 14:14:15 CST
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