Full text index not being used, even though it is in the plan

From: Alex Neth <alex(at)liivid(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Full text index not being used, even though it is in the plan
Date: 2009-02-01 15:56:17
Message-ID: 7D12FB69-F053-40B5-A214-174C03CD8B82@liivid.com
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I am trying to use a full text index, but it seems to be reindexing on
every query.

The query plan looks fine, but the queries take extremely long (hours
even). I think it is reindexing because it is notifying me that
certain long "words" won't be indexed as you can see below, which is
what it does when I create the index.

=> explain select id from source_listings where
plainto_tsquery('view') @@ to_tsvector('english', full_listing);
QUERY PLAN
--------------------------------------------------------------------------------------------------------
Bitmap Heap Scan on source_listings (cost=1454.88..7445.47
rows=1595 width=4)
Recheck Cond: (plainto_tsquery('view'::text) @@
to_tsvector('english'::regconfig, full_listing))
-> Bitmap Index Scan on kw2_index (cost=0.00..1454.48 rows=1595
width=0)
Index Cond: (plainto_tsquery('view'::text) @@
to_tsvector('english'::regconfig, full_listing))

=> explain analyze select id from source_listings where
plainto_tsquery('view') @@ to_tsvector('english', full_listing);
NOTICE: word is too long to be indexed
DETAIL: Words longer than 2047 characters are ignored.
NOTICE: word is too long to be indexed
DETAIL: Words longer than 2047 characters are ignored.
... it just keeps building a new index until I kill it
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