Just discovered, I can’t use GIST over character varying...
Any other tips on how to optimize the query? Here are about 1,000,000 (one million) records in this table, table scan takes about 5 to 6 seconds on actual hardware (SAS, 1 Xeon, 2Gb memory on CentOS with all normal performance hacks).
select * from notafiscal where numeroctc like ‘POA%34345’;
Thanks,
Edson.
De: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] Em nome de Edson Carlos Ericksson Richter
Enviada em: segunda-feira, 26 de setembro de 2011 11:03
Para: pgsql-general@postgresql.org
Assunto: RES: [GENERAL] Does postgresql 9.0.4 use index on PREFIX%SUFFIX queries?
Thanks for the tip, unfortunately, split it does not work for me, since it’s a free text field, that users fill as they wish...
But looking most slow queries, this one pops up with more frequency...
So GIST would work; I’ll give a try.
Regards,
Edson.
De: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] Em nome de Gregg Jaskiewicz
Enviada em: segunda-feira, 26 de setembro de 2011 10:01
Para: Edson Carlos Ericksson Richter
Cc: pgsql-general@postgresql.org
Assunto: Re: [GENERAL] Does postgresql 9.0.4 use index on PREFIX%SUFFIX queries?
You can always store it divided in the database into two columns.
Gist could also work for you.