From: J@Planeti.Biz
To: josh@agliodbs.com
To: pgsql-performance@postgresql.org
Subject: Re: Multiple Order By Criteria
Date: Tue, 17 Jan 2006 17:29:04 -0500
Message-ID: <05d801c61bb5$6c8824d0$681e140a@fatchubby> (raw)
References: <05c301c61bb1$d88c6a00$681e140a@fatchubby>
<200601171425.38772.josh@agliodbs.com>
I created the index, in order. Did a vacuum analyze on the table and my
explain still says:
Limit (cost=229610.78..229611.03 rows=100 width=717)
-> Sort (cost=229610.78..230132.37 rows=208636 width=717)
Sort Key: receipt, carrier_id, batchnum, encounternum, encounter_id
-> Seq Scan on detail_summary ds (cost=0.00..22647.13 rows=208636
width=717)
Filter: (receipt >= '2004-03-22'::date)
So, for fun I did
set enable_seqscan to off
But that didn't help. For some reason, the sort wants to do a seq scan and
not use my super new index.
Am I doing something wrong ?
----- Original Message -----
From: "Josh Berkus" <josh@agliodbs.com>
To: <pgsql-performance@postgresql.org>
Cc: <J@planeti.biz>
Sent: Tuesday, January 17, 2006 5:25 PM
Subject: Re: [PERFORM] Multiple Order By Criteria
> J,
>
>> I have an index built for each of these columns in my order by clause.
>> This query takes an unacceptable amount of time to execute. Here are the
>> results of the explain:
>
> You need a single index which has all five columns, in order.
>
> --
> --Josh
>
> Josh Berkus
> Aglio Database Solutions
> San Francisco
>
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To: pgsql-performance@postgresql.org
Cc: J@Planeti.Biz, josh@agliodbs.com
Subject: Re: Multiple Order By Criteria
In-Reply-To: <05d801c61bb5$6c8824d0$681e140a@fatchubby>
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