Can i Force to postgrsql to use a certain index?

Hi every body

it is possible to force to postgresql to use a certain index? I know that
in mysql exits Force index (index_name) option for select queries
SELECT * FROM precalc FORCE INDEX (hladrb50101) ;

any of you have used this?

thanks

pau

--
Pau Marc Muñoz Torres

Laboratori de Biologia Computacional
Institut de Biotecnologia i Biomedicina Vicent
Villar
Universitat Autonoma de Barcelona
E-08193 Bellaterra (Barcelona)

telèfon: 93 5812807
Email : paumarc.munoz@bioinf.uab.cat

Pau Marc Munoz Torres wrote:

Hi every body

it is possible to force to postgresql to use a certain index? I know
that in mysql exits Force index (index_name) option for select queries
SELECT * FROM precalc FORCE INDEX (hladrb50101) ;

any of you have used this?

No. PostgreSQL will not allow you to do that. Not to mention, a SELECT *
without a where clause will always scan the whole table so an Index
would be useless.

Joshua D. Drake