from what i ve read and have i ve seen in practice, i expected it to do nothing at all. i just wanted to be absolutely sure and that's why i asked here. thank you very much for the clarification -- View this message in context: http://postgresql.1045698.n5.nabble.com/vacuum-internals-and-performance-affect-tp5033043p5039677.html Sent from the PostgreSQL - performance mailing list archive at Nabble.com. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance