RES: Does postgresql 9.0.4 use index on PREFIX%SUFFIX queries?

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(at)postgresql(dot)org [mailto:pgsql-general-owner(at)postgresql(dot)org] Em nome de Edson Carlos Ericksson Richter
Enviada em: segunda-feira, 26 de setembro de 2011 11:03
Para: pgsql-general(at)postgresql(dot)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(at)postgresql(dot)org [mailto:pgsql-general-owner(at)postgresql(dot)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(at)postgresql(dot)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.