Re: Strange Index behavior

But why? I thought the planner is for choose the quicker way to the target
point. If there is an index which is probably would speed up the query then
why does the planner ignore that?

The difference between the result times is 16x. I can't understand why the
planner thinks it is the better way...

-- Csaba

-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Wednesday, December 22, 2004 6:34 PM
To: Együd Csaba (Freemail)
Cc: 'Együd Csaba'; pgsql-general@postgresql.org
Subject: Re: [GENERAL] Strange Index behavior

=?iso-8859-2?Q?Egy=FCd_Csaba_=28Freemail=29?= <csegyud@freemail.hu> writes:
> The point is that there are cases where a primary key index is not
> used - even if the condition is formaly good.

You haven't actually shown us such a case.  In the case you gave, I think
the planner probably made the right choice not to use the index.

            regards, tom lane



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