Note that you seem to have a lot more IO wait in the first run than in the second, which means that the task is hitting the disks more in the first run than in the second one. Once IO wait starts to climb, performance starts to dive, generally. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
