On Fri, Jul 20, 2012 at 6:19 PM, Ioannis Anagnostopoulos
<ioannis@anatec.com> wrote:
> (feed_all_y2012m07.ship_pos_messages join
> ais_server.ship_objects on (ship_pos_messages.obj_id = ship_objects.obj_id))
> on (message_copies.msg_id = ship_pos_messages.msg_id)
It's this part of the query that's taking 3.2 hours.
Move the filtered message_copies to a CTE, and the filtered
ship_pos_messages join to another CTE. That should (in my experience)
get you better performance.