Hi, thanks for the suggestion, but it didn't help. We have tried it earlier. 7500ms http://explain.depesz.com/s/ctn ALTER TABLE product_parent ALTER COLUMN parent_name SET STATISTICS 1000; ALTER TABLE product ALTER COLUMN parent_id SET STATISTICS 1000; ANALYZE product_parent; ANALYZE product; query was: select distinct product_code from product p_ inner join product_parent par_ on p_.parent_id=par_.id where par_.parent_name like 'aa%' limit 2 i've played with the query, and found an interesting behaviour: its speed depends on value of limit: select ... limit 2; => 1500ms select ... limit 20; => 14ms (http://explain.depesz.com/s/4iL) select ... limit 50; => 17ms These were with high effective_cache_size (6GB). Somehow it uses good planning in these cases. If it helps i can send the db to repro (53M). Any tips to try? Thanks in advance, Istvan -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
