Restart
your database with following INIT.ORA parameter _Corrupted_rollback_segments =
(rbs01, rbs01, rbs03, rbs04) if one of your rollback segments is corrupted.
You
can then drop the corrupted rollback segments and create it from scratch.
Caution is advised when enabling this parameter, as uncommitted transactions
will be marked as committed.
One
can very well end up with lost or inconsistent data!!!
Please
contact Oracle Support before using it.
_Corrupted_rollback_segments = (rbs01, rbs01,
rbs03, rbs04)