From: BBI Edwin Punzalan <edwin@bluebamboo.ph>
To: 'gnari' <gnari@simnet.is>
To: pgsql-performance@postgresql.org
Subject: Re: FW: Index usage
Date: Wed, 24 Nov 2004 17:43:52 +0800
Message-ID: <000501c4d20a$1b842ed0$b400a8c0@bluebamboo.ph> (raw)
In-Reply-To: <001101c4d200$6fbe6c40$0100000a@wp2000>
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
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To: pgsql-performance@postgresql.org
Cc: edwin@bluebamboo.ph, gnari@simnet.is
Subject: Re: FW: Index usage
In-Reply-To: <000501c4d20a$1b842ed0$b400a8c0@bluebamboo.ph>
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