Re-start your database with the following INIT.ORA parameter 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)