Re: Eh?

From: "Josh Berkus" <josh(at)agliodbs(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Josh Berkus" <josh(at)agliodbs(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Eh?
Date: 2001-08-14 04:50:36
Message-ID: web-101709@davinci.ethosmedia.com
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Tom,

> > SHould I be concerned about this?
>
> > DEBUG: geqo_main: using edge recombination crossover [ERX]
>
> Nope. See
> http://www.ca.postgresql.org/users-lounge/docs/7.1/postgres/geqo.html

Cool! I love it when I actually get the chance to see some advance
theory applied. And congrats on implementing it!

Of course, we'll see if it really boosts query optimization when there's
a full data population. This view has 3 UNION statements, 11
subselects, 35 JOINS, and calls on 3 custom formatting functions (two of
them many times). A good "destruction test" for the GEQO, hey? The
only thing I'm missing is a couple of LEFT OUTER JOINS and maybe a WHERE
NOT EXISTS.

-Josh

P.S. The purpose of the view is to "flatten" a large chunk of complex
relational data into a comma-delimited text table to be imported into an
accounting program.

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In response to

  • Re: Eh? at 2001-08-14 02:02:02 from Tom Lane

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  • Re: Eh? at 2001-08-14 05:31:04 from Tod McQuillin

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