Hi, could you providence the code used with PG ? Has table dept_new an index/pk on c1 ? Do you analyze this table after loading it ? Regards PAscal -- Sent from: http://www.postgresql-archive.org/PostgreSQL-performance-f2050081.html -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance