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Re: Querying distinct values from a large table

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Gregory Stark <gsstark(at)mit(dot)edu>
Cc: Luke Lonergan <llonergan(at)greenplum(dot)com>, Chad Wagner <chad(dot)wagner(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Igor Lobanov <ilobanov(at)swsoft(dot)com>, Richard Huxton <dev(at)archonet(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Querying distinct values from a large table
Date: 2007-01-30 17:04:43
Message-ID: 20070130170443.GJ2303@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-performance
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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