Re: Querying distinct values from a large table - Mailing list pgsql-performance

From Tom Lane
Subject Re: Querying distinct values from a large table
Date
Msg-id 16278.1170222919@sss.pgh.pa.us
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In response to Re: Querying distinct values from a large table  (Alvaro Herrera <alvherre@commandprompt.com>)
Responses Re: Querying distinct values from a large table
Re: Querying distinct values from a large table
List pgsql-performance
Alvaro Herrera <alvherre@commandprompt.com> writes:
> 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.

Luke has a bad habit of quoting numbers that are obviously derived from
narrow benchmarking scenarios as Universal Truths, rather than providing
the context they were derived in.  I wish he'd stop doing that...

            regards, tom lane

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