Hi,
After upgrading to 8.0.3 I see very poor performance on several indexes.
Like this: (udps is a view on main)
palga=> explain analyze select rapnaam from udps where naamvrouw like 'vos%';
QUERY PLAN
--------------------------------------------------------------------------------------------------------------------
Index Scan using nv on main (cost=0.00..242.65 rows=60 width=14) (actual
time=6.475..11598.502 rows=5692 loops=1)
Index Cond: (((naamvrouw)::text >= 'vos'::character varying) AND
((naamvrouw)::text < 'vot'::character varying))
Filter: ((naamvrouw)::text ~~ 'vos%'::text)
Total runtime: 11606.250 ms
(4 rows)
The index was created with:
CREATE INDEX nv ON main USING btree (naamvrouw);
Database was recently analyzed. Clearly, something has to be tuned that didn't
need tuning on 7.4.3 ? (Main table has about 1.7 million records).
Any suggestions welcome.
Cheers,
Han Holl
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