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Re: FW: Index usage

From: "gnari" <gnari(at)simnet(dot)is>
To: "BBI Edwin Punzalan" <edwin(at)bluebamboo(dot)ph>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: FW: Index usage
Date: 2004-11-24 08:34:38
Message-ID: 001101c4d200$6fbe6c40$0100000a@wp2000 (view raw or flat)
Thread:
Lists: pgsql-performance
From: "BBI Edwin Punzalan" <edwin(at)bluebamboo(dot)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





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