From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Jeff Davis <pgsql(at)j-davis(dot)com> |
Cc: | pgsql-docs(at)postgresql(dot)org |
Subject: | Re: Tsearch docs question |
Date: | 2007-10-26 19:26:26 |
Message-ID: | 24984.1193426786@sss.pgh.pa.us |
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Lists: | pgsql-docs |
Jeff Davis <pgsql(at)j-davis(dot)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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