You could always restore this file from your database backup and then apply recovery to start your database. Otherwise, you'll have to perform these steps:
- Modify your parameter file to not contain the ROLLBACK_SEGMENTS parameter.
- Startup the instance in MOUNT mode.
- ALTER TABLESPACE rbs OFFLINE DROP;
- DROP TABLESPACE rbs;
- ALTER DATABASE OPEN;
- Create a new RBS tablespace and create new rollback segments.
- All the rollback segments in your parameter file.
- Restart the instance.
Dig Deeper on Oracle database backup and recovery
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