Re: FW: Index usage

Yes, the database is being vacuum-ed and analyzed on a daily basis.

Our version is 7.2.1

-----Original Message-----
From: gnari [mailto:gnari@simnet.is]
Sent: Wednesday, November 24, 2004 4:35 PM
To: BBI Edwin Punzalan; pgsql-performance@postgresql.org
Subject: Re: [PERFORM] FW: Index usage


From: "BBI Edwin Punzalan" <edwin@bluebamboo.ph>

> db=# explain analyze select date from chatlogs where date>='11/23/04'
> and date<'11/25/04';
> NOTICE:  QUERY PLAN:
>
> Seq Scan on chatlogs  (cost=0.00..24763.19 rows=9200 width=4) (actual
> time=0.45..4268.00 rows=23787 loops=1) Total runtime: 4282.81 msec
> ==============
>
> How come a query on the current date filter uses an index and the
> others does not?  This makes indexing to speed up queries quite
> difficult.

have you ANALYZED the table lately ?
what version postgres are you using ?

gnari