On Tue, May 08, 2007 at 10:18:34AM -0400, Susan Russo wrote: > explain analyze output on Pg7.3.2: > > -> Index Scan using dbxref_idx2 on dbxref dx > (cost=0.00..5.83 rows=1 width=21) (actual time=25.58..25.58 rows=0 loops=1) > Index Cond: ((accession >= 'AY851043'::character > varying) AND (accession < 'AY851044'::character varying)) > Filter: (accession ~~ 'AY851043%'::text) > > explain analyze output on Pg8.1.4: > > -> Seq Scan on dbxref dx (cost=0.00..47923.91 rows=1 > width=21) (actual time=2463.646..2463.646 rows=0 loops=1) > Filter: ((accession)::text ~~ 'AY851043%'::text)
This is almost all of your cost. Did you perchance initdb the 8.1.4 cluster in a non-C locale? You could always try CREATE INDEX test_index ON dbxref (accession varchar_pattern_ops); which would create an index that might be more useful for your LIKE query, even in a non-C locale. /* Steinar */ -- Homepage: http://www.sesse.net/ ---------------------------(end of broadcast)--------------------------- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
