ORA-30018: Create Rollback Segment failed, USN string is out of range

ORA-30018: Create Rollback Segment failed, USN string is out
of range

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ORA-30018: Create Rollback Segment failed, USN string is out of range..

Answer / guest

Cause: the system runs out of undo segment number. Too many
undo segments exist.

Action: drop some of the unused undo segments and retry
operation.

Please add more information about this Error

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