Yantao Shi <y(dot)shi(at)larc(dot)nasa(dot)gov> writes:
> testdbspc=# explain select file_name from catalog where file_name like
> 'MOD04_L2.A2005311.%.004.2005312013%.hdf';
> QUERY PLAN
> Seq Scan on catalog (cost=0.00..429.00 rows=1 width=404)
> Filter: (file_name ~~ 'MOD04_L2.A2005311.%.004.2005312013%.hdf'::text)
> (2 rows)
I'm betting you are using a non-C locale. You need either to run the
database in C locale, or to create a special index type that is
compatible with LIKE searches. See
http://www.postgresql.org/docs/8.1/static/indexes-opclass.html
regards, tom lane