From: Stephan Szabo <sszabo@megazone.bigpanda.com>
To: ow <oneway_111@yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: pg 7.4.rc1, Range query performance
Date: Sat, 8 Nov 2003 18:37:45 -0800 (PST)
Message-ID: <20031108183630.I51201@megazone.bigpanda.com> (raw)
In-Reply-To: <20031109021012.65828.qmail@web21401.mail.yahoo.com>
References: <20031109021012.65828.qmail@web21401.mail.yahoo.com>
On Sat, 8 Nov 2003, ow wrote:
> Postgresql 7.4.rc1 on i686 pc linux compiled by gcc 2.06.
> All configuration settings are default.
>
>
> Hi,
>
> Trying to find a way to improve range query performance.
>
> The table Test has about 30 million records.
>
> -- DLong, Dtimestamp, Dint, etc are domains of the respective types.
> create table Test (
> id DLong not null,
> a Dtimestamp null,
> b Dint not null,
> c Dint not null,
> d Dstring null,
> constraint PK_id primary key (id),
> constraint AK_abc unique (a, b, c)
> );
I'm not sure that AK_abc is the best index for check a range on a and
single values on b and c. I'd think that something like an index
on (b,c,a) would probably be better for this purpose (without doing any
testing ;) ).
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone.bigpanda.com, oneway_111@yahoo.com
Subject: Re: pg 7.4.rc1, Range query performance
In-Reply-To: <20031108183630.I51201@megazone.bigpanda.com>
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