An additional consideration: If you convert the tablespaces in place with
dbms_space_admin, check the default storage for initial and next extent.
When you do the conversion with dbms_space_admin, a space header is created
and the extent allocation for the space header will be whatever the default
extent allocation is.

You might also have to change how you monitor the free space in your locally
managed tablespaces.  For example, we used to monitor for the ability to add
additional extents for whatever the largest next extent size for all the
tables in the tablespace.  Monitoring would e-mail for inability to
accommodate two additional extents and send out a page for inability to
accommodate one additional extent.  We had to change this some with local
management using uniform extents.  With uniform extents, it is likely that
you will be using smaller extents.  So if you don't trust the users enough
to allow auto-extend, then your space monitoring must be enhanced to take
into consideration smaller uniform extents.

The dbms_space_admin conversion takes only a few seconds even on 50 Gig
tablespaces.  And if you don't like what you see, you can convert the
tablespace back to dictionary managed; then back to local; then back to
dictionary .... Oh this is fun!
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
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