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Oracle® Database 11g / 12c / 18c error codes ORA-01535: rollback segment '[string]' already exists or given name has prefix _SYSSMU

ORA-01535: rollback segment '[string]' already exists or given name has prefix _SYSSMU
Oracle Error Code: ORA-01535
Cause: Specified rollback segment already exists or given name starts with _SYSSMU.
Action: Use a different name. Note that _SYSSMU is an illegal prefix to an RBU segment.