we are seeking for a solution to make the dumop (e.g. the backup) more random
Can you please explain why? ( just curious, this seems a very strange requirement )
you _could_ _try_ to use postgres feature of synchronised seqscans to achieve this, but I'm not sure if it will work.
(after a minute of googling ... no it will not work - http://archives.postgresql.org/pgsql-committers/2008-01/msg00358.php )
cheers,
Filip
