RE: Why does this query need a table access by rowid?
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 23 Jul 2004 14:21:34 -0400
Thanks to Jonathan, Karen, and Tanel.
Tanel, that was my first thought when I read the explanation. I'm =
already building the suggested index, and I'm confident it will solve =
the problem.
Thanks again, all.
-Mark
Mark J. Bobak
Oracle DBA
ProQuest Company
Ann Arbor, MI
"Post Hoc Ergo Propter Hoc"
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx =
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Tanel P=F5der
Sent: Friday, July 23, 2004 2:17 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Why does this query need a table access by rowid?
> So, the index is recognized, and that's great. My question is, why is
> the TABLE ACCESS BY ROWID required?
> Since only the DOC_ID is in the select list, why the table access?
Since in the index you don't have the DOC_ID column, you have only the
function of DOC_ID in your index and Oracle isn't smart enough to look
inside the function to see whether the funcion leaves the value =
unaltered...
Try to do a composite index on f(doc_id), doc_id.
Tanel.
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