RE: Query takes ages in Oracle 10G

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 Or, on the contrary, maybe your auto stats job hasn't run yet in your new 10g database so your stats are absent or out of date?    

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