From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jeff Davis <pgsql@j-davis.com>
Cc: pgsql-docs@postgresql.org
Subject: Re: Tsearch docs question
Date: Fri, 26 Oct 2007 15:26:26 -0400
Message-ID: <24984.1193426786@sss.pgh.pa.us> (raw)
In-Reply-To: <1193423136.7624.56.camel@dogma.ljc.laika.com>
References: <1193423136.7624.56.camel@dogma.ljc.laika.com>
Jeff Davis <pgsql@j-davis.com> writes:
> The Tsearch docs, under the GiST and GIN section, say:
> "Lossiness [of GiST] causes serious performance degradation since random
> access of heap records is slow and limits the usefulness of GiST
> indexes."
> The docs do go into some detail, but I think it causes some confusion,
> also.
Are you looking at CVS HEAD, or what was there in beta1? I rewrote
that stuff a few days ago:
http://developer.postgresql.org/pgdocs/postgres/textsearch-indexes.html> There's also a related issue: I think a RECHECK would be less costly if
> you have the tsvectors materialized in the table (using triggers) and
> index that. Maybe that could be a tip for using GiST indexes.
Yeah, I mentioned that somewhere in the chapter, I think.
regards, tom lane
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To: pgsql-docs@postgresql.org
Cc: tgl@sss.pgh.pa.us, pgsql@j-davis.com
Subject: Re: Tsearch docs question
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