advantage using dict over locally managed??

[TimHall]

You should always use Locally Managed Tablespaces where possible. It is highly likely that Oracle10i will not allow dictionary management at all. The only reason to stay with dictionary management is if you're living in the dark ages. Oracle9i Rel 2 allows the SYSTEM tablespace to be local also.

When using Oracle9i you should also use Automatic Segment Free Space Management.