POSTGRESQL Optimizer

Started by Tourtounis Sotirisalmost 24 years ago2 messagesgeneral
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#1Tourtounis Sotiris
tourtoun@csd.uoc.gr

I wonder how i can enforce the PostgreSQL optimizer in order to use the
indexes in cases of SQL queries with comparison (<,>) and not equality. I
create a table with 4 attributes, the two of them are types of integer8 in
PostgreSQL and i create to those 2 indexes (which by default are B+trees).
However they didn't work. I would appreciate any comment.

SWTHRHS TOYRTOYNHS
(tourtoun@csd.uch.gr)

#2Tycho Fruru
tycho@fruru.com
In reply to: Tourtounis Sotiris (#1)
Re: POSTGRESQL Optimizer

On Fri, 2002-06-21 at 14:45, Tourtounis Sotiris wrote:

I wonder how i can enforce the PostgreSQL optimizer in order to use the
indexes in cases of SQL queries with comparison (<,>) and not equality. I
create a table with 4 attributes, the two of them are types of integer8 in
PostgreSQL and i create to those 2 indexes (which by default are B+trees).
However they didn't work. I would appreciate any comment.

try

select * from foo where bar > '12345';

insted of

select * from foo where bar > 12345;

did you vacuum analyze before ?

Cheers
Tycho

--
Tycho Fruru tycho@fruru.com
"Prediction is extremely difficult. Especially about the future."
- Niels Bohr