Vladimir,
I am afraid PostgreSQL is not smart enough to rewrite query with "or" into two separate index scans. There is no way to improve the query significantly without rewriting it. Note: for this case indices on (datecol), (cr) and (db) are not very helpful.
Thank you very much. I added you indexes to db and re-write query. Now it runs fast. Andrus. -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
