From: Alvaro Herrera <alvherre@commandprompt.com>
To: Gregory Stark <gsstark@mit.edu>
Cc: Luke Lonergan <llonergan@greenplum.com>
Cc: Chad Wagner <chad.wagner@gmail.com>
Cc: Simon Riggs <simon@2ndquadrant.com>
Cc: Igor Lobanov <ilobanov@swsoft.com>
Cc: Richard Huxton <dev@archonet.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Querying distinct values from a large table
Date: Tue, 30 Jan 2007 14:04:43 -0300
Message-ID: <20070130170443.GJ2303@alvh.no-ip.org> (raw)
In-Reply-To: <87d54wmpvd.fsf@stark.xeocode.com>
References: <C1E49CB9.199A4%llonergan@greenplum.com>
<87d54wmpvd.fsf@stark.xeocode.com>
Gregory Stark wrote:
> (Incidentally I'm not sure where 2-5x comes from. It's entirely dependant on
> your data distribution. It's not hard to come up with distributions where it's
> 1000x as fast and others where there's no speed difference.)
So the figure is really "1-1000x"? I bet this one is more impressive in
PHB terms.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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To: pgsql-performance@postgresql.org
Cc: alvherre@commandprompt.com, gsstark@mit.edu, llonergan@greenplum.com, chad.wagner@gmail.com, simon@2ndquadrant.com, ilobanov@swsoft.com, dev@archonet.com
Subject: Re: Querying distinct values from a large table
In-Reply-To: <20070130170443.GJ2303@alvh.no-ip.org>
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