On 10 May 2012 15:05, Radosław Smogura <rsmogura@xxxxxxxxxxxxxxx> wrote: > May I ask what kind of planning may occur during insert? Well, for example, if there's a unique constraint on the table then the database will have to check that the newly inserted values don't conflict with values that are already in the table. It needs to plan an efficient strategy for that, which depends on the values being inserted. -- If you can't see the forest for the trees, Cut the trees and you'll see there is no forest. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general