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Didn't your reply started with:
"If it's wrong why should I use locally managed tablespaces in 8.1.7 then?!!!"?

Your assumptions from previous message were not correct: "In other words, a locally managed rollback segment is almost like a almost-more-or-less-undo-tablespace?", and you've got the right answer. Nothing could be further from truth than your above assumption. RBS in LMT is totaly totaly totaly different than undo tablespaces as in 9i. Totaly different concept, totaly different technology, totaly different behavior.

And I can't understand your wories about setting the storage parameters for rollback segments in LMT (and BTW, some of the storage parameters *are* allowed in LMT). What difference does it make? How often do you create rollback segments? More or less once in a liftime of a database, I guess. And after all, why don't you try it on some test instance and see what the results will be?