Is there a way to SubPartition?

[Jerry Champlin <jchamplin@xxxxxxxxxxxxxxxxxxxxxxxx>]

Is there a way to use multi-level inheritance to achieve sub 
partitioning that the query optimizer will recognize?  With our current 
application design, we would need a partition for every other day  for 
18 months which will not perform well.  The reason we need so many 
partitions is that we can't afford to vacuum the active partition (750MM 
inserts + updates per day is the performance requirement for 12 months 
out).  After it's a day old, there are no  longer any updates or inserts 
and we can vacuum  it at that point.  If multi-level partitioning 
worked, we could solve this problem without changing our code.  Ideas?

-Jerry