From: Tom Lane <tgl@sss.pgh.pa.us>
To: carlos.reimer@opendb.com.br
Cc: pgsql-performance@postgresql.org
Subject: Re: Improving SQL performance
Date: Thu, 11 Jan 2007 13:31:07 -0500
Message-ID: <28140.1168540267@sss.pgh.pa.us> (raw)
In-Reply-To: <PEEPKDFEHHEMKBBFPOOKAEDKDNAA.carlos.reimer@opendb.com.br>
References: <PEEPKDFEHHEMKBBFPOOKAEDKDNAA.carlos.reimer@opendb.com.br>
"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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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, carlos.reimer@opendb.com.br
Subject: Re: Improving SQL performance
In-Reply-To: <28140.1168540267@sss.pgh.pa.us>
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