So if an export was taking place and CONSISTENT=Y, then you are saying a user who wanted to update a partition of a partitioned table would be allowed to submit a txn updating the table but that the new data from the txn would be stored in the rollback seg until it was clear (export of the partitioned table had completed) to apply the changes to the buffer held copy (req by the export) and ultimately the datafile.

Regds
Gus