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From: Steinar H. Gunderson <sgunderson@bigfoot.com>
To: pgsql-performance@postgresql.org
Subject: Re: [GENERAL] Creation of tsearch2 index is very slow
Date: Sat, 21 Jan 2006 01:05:19 +0100
Message-ID: <20060121000519.GA29755@uio.no> (raw)
In-Reply-To: <6532.1137801157@sss.pgh.pa.us>
References: <26153.1137784469@sss.pgh.pa.us>
	<20060120201036.GE31908@svana.org>
	<26583.1137788505@sss.pgh.pa.us>
	<20060120205132.GF31908@svana.org>
	<26958.1137791955@sss.pgh.pa.us>
	<20060120213754.GG31908@svana.org>
	<7.0.1.0.2.20060120174141.039b03e8@earthlink.net>
	<6111.1137797436@sss.pgh.pa.us>
	<20060120225751.GA27230@uio.no>
	<6532.1137801157@sss.pgh.pa.us>

On Fri, Jan 20, 2006 at 06:52:37PM -0500, Tom Lane wrote:
> It's also worth considering that the entire approach is a heuristic,
> really --- getting the furthest-apart pair of seeds doesn't guarantee
> an optimal split as far as I can see.  Maybe there's some totally
> different way to do it.

For those of us who don't know what tsearch2/gist is trying to accomplish
here, could you provide some pointers? :-) During my mini-literature-search
on Google, I've found various algorithms for locating clusters in
high-dimensional metric spaces[1]; some of it might be useful, but I might
just be misunderstanding what the real problem is.

[1] http://ieeexplore.ieee.org/iel5/69/30435/01401892.pdf?arnumber=1401892 ,
    for instance

/* Steinar */
-- 
Homepage: http://www.sesse.net/



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