> 	o Allow multiple vacuums so large tables do not starve small
> 	  tables
>
> 	  http://archives.postgresql.org/pgsql-general/2007-01/msg00031.php
>
> 	o Improve control of auto-vacuum
>
> 	  http://archives.postgresql.org/pgsql-hackers/2006-12/msg00876.php