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Re: Querying distinct values from a large table

llonergan@greenplum.com

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From: "Luke Lonergan" <llonergan@greenplum.com>
To: "Alvaro Herrera" <alvherre@commandprompt.com>, "Gregory Stark" <gsstark@mit.edu>
Cc: "Chad Wagner" <chad.wagner@gmail.com>, "Simon Riggs" <simon@2ndquadrant.com>, "Igor Lobanov" <ilobanov@swsoft.com>, "Richard Huxton" <dev@archonet.com>, pgsql-performance@postgresql.org
Date: 2007-01-30T18:20:28Z
Lists: pgsql-performance 
Alvaro,

On 1/30/07 9:04 AM, "Alvaro Herrera" <alvherre@commandprompt.com> 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.

You got me - I'll bite - what's PHB?

- Luke