Oracle-L: RE: View HELP Please!

From: Mercadante, Thomas F <NDATFM_at_labor.state.ny.us>
Date: Wed, 12 Feb 2003 11:23:59 -0800
Message-ID: <F001.0054B0C0.20030212112359@fatcity.com>

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.

-----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
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Author: Freeman Robert - IL
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Author: DENNIS WILLIAMS
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Author: Mercadante, Thomas F
INET: NDATFM_at_labor.state.ny.us

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