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Home -> Community -> Mailing Lists -> Oracle-L -> RE: View HELP Please!
Ron, man, you got me on the version thing. I yell at people who don't say
what version they are on, and here I am forgetting to do the same. I'm on
9iR2.
You are correct that the view would not use the index if I just did a select * from it with no additional predicates. However, if I do a select * from a view with a predicate in that select statement (like user_id=100) then the additional predicate should be merged into the view and a new execution plan (using index lookup) should be generated.
Thanks!
RF
-----Original Message-----
To: Multiple recipients of list ORACLE-L
Sent: 2/12/2003 10:04 AM
Robert,
I will make the assumption that you are on a newer version of Oracle.
If I remember correctly, a view does not use an index and will use a
full table scan. That could be the cause for the time difference.
I know that this doesn't answer your question but it might trigger
other thoughts that solve the problem.
Ron
>>> FREEMANR_at_tusc.com 02/12/03 10:18AM >>>
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
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Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Freeman Robert - IL
INET: FREEMANR_at_tusc.com
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Ron Rogers
INET: RROGERS_at_galottery.org
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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 - 10:28:53 CST
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