I think I fixed the problem... within my view, there was actually
aggrigation of the predicate going on. I'm thinking that this is why Oracle
could not push the predicate into the view. Once I removed the aggregation
(I moved it to a higher level view) it worked great.
Thanks to everyone for your thoughts.
RF
-----Original Message-----
To: Multiple recipients of list ORACLE-L
Sent: 2/12/2003 1:54 PM
Robert,
have you tried recoding the view with the hint in the view text? Or am
I misunderstanding your original post which looks like you've put the
hints on the select count(*) statement?
Rachel
- Freeman Robert - IL <FREEMANR_at_tusc.com> wrote:
> 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
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> Author: Freeman Robert - IL
> INET: FREEMANR_at_tusc.com
>
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Received on Wed Feb 12 2003 - 14:56:18 CST
