Yes, casting the result improved the time response a lot.
Thank you!
Reimer
> -----Mensagem original-----
> De: pgsql-performance-owner@postgresql.org
> [mailto:pgsql-performance-owner@postgresql.org]Em nome de Tom Lane
> Enviada em: quinta-feira, 11 de janeiro de 2007 16:31
> Para: carlos.reimer@opendb.com.br
> Cc: pgsql-performance@postgresql.org
> Assunto: Re: [PERFORM] Improving SQL performance
>
>
> "Carlos H. Reimer" <carlos.reimer@opendb.com.br> writes:
> > I know that the problem with the following SQL is the "LOG.CODCEP =
> > ENDE.CODCEP||CODLOG" condition, but what can I
> > do to improve the performance?
>
> Seems the problem is not using an index for tt_log. Do you have an
> index on tt_log.codcep? If so, maybe you need to cast the result of
> the concatenation to char(8) to get it to use the index.
>
> regards, tom lane
>
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