Ryan,

Oracle can certainly transport more than one datafile at a
time.  I'm not sure what you mean by "the datafiles need to
be 'atomic' to be transported", but it is certainly a
limitation of the application logic, not Oracle.  You could
transport every single PERMANENT tablespace in a database
(except SYSTEM) in a single TTS operation, regardless of how
many datafiles were involved in each tablespace or in the
database.  Perhaps the person working on the application has
gotten off on the wrong foot and needs to add some
real-world considerations to it?

With regards to datafile sizes, just because you can create
ultra-large datafiles doesn't mean you should.  Doing so
means letting yourself in for some really painful downstream
after-effects, I think.  My personal preference is a max
datafile size of 2G, 4G, or 8G regardless of 32-bit, 64-bit,
or large files capabilities.  YMMV...

For reasons why, think about it from the backup/restore
perspective.  Which database can be backed up or restored
faster:  one with 100 2Gb datafiles or one with 2 100Gb
datafiles?  Datafile management is just like extent
management.  As Roger Waters said, "All in all, they're all
just bricks in the wall"...  :-)

Just my $0.02...

-Tim

> One of the guys here did some research and found that
> files over 32GB can cause data dictionary corruption.
> anyone have problems with this? we are using an automated
> transportable tablespace process with alot of logic and
> between many instances and servers. 
> we would prefer not to complicate the logic by having to
> introduce additional tablespaces to transport(cant do
> multiple datafiles in one tablespace because the datafiles
> need to be atomic to be transported).  
> so anyone use datafiles larger than 32GBs. What happened?
> I know most of you dont, but we are in a unique situation.
> 
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