RE: Query takes ages in Oracle 10G
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <isabel_bga@xxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 21 Sep 2006 14:24:39 -0700
If I understand correctly, you're saying that the following query is the
problem - it runs slow by itself, regardless of the other sub and parent
queries:
SELECT VENCIM_TITULO_NUMERO___
FROM VENCIM
WHERE VENCIM_ESCENA_CODIGO___ = 'REAL'
AND
VENCIM_PORTAF_CODIGO___ = 'OBL'
AND
VENCIM_ESTADO___ = 2
AND
VENCIM_FECCOBORI <= '21/09/2006'
Is that correct?
What was the explain plan for this query when you traced it?
Maybe it is expecting the date predicate to be more selective than it
really is so it's using an index there instead of a FTS?
Maybe the problem could be related to auto gathering of histograms in
10g? Try deleting histograms on the table and see if that helps. Or,
on the contrary, maybe your auto stats job hasn't run yet in your new
10g database so your stats are absent or out of date?
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