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1) Create new UNDO tablespace, make it the default.
2) Say goodbye to anything you had in the previous UNDO tablespace. Then get rid of it.
3) Make sure you have a good backup & recovery plan/system. What do you think happens to a tablespace when you whack one of its datafiles? You're lucky you didn't do this to a relevant data type of datafile.
4) Read, study, learn. Which Oracle DBA reference book do you own?
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