transporting 3 TBs of data to a new database

I am on ASM, the group moving the data is not. I think transportable
tablespaces is the best way to do this. So I have to use RMAN to put the
data in ASM. Is this a copy to an an ASM tablespace? Any idea how
this works? I am trying to figure out how long this will take. We may be
able to do it in pieces.

I dont think data pump is good for this.

I also dont know a good wait to write comma delimitted files out of this
much data to sql load.

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