Oracle DB Error ORA-01636 rollback segment string is already online

The following is the cause of this error:

A rollback segment can only be used by one instance and an instance is trying to bring a rollback segment online that is already in use.

Action you can take to resolve this issue: Check that the values set in the initialization parameter file for parameters ROLLBACK_SEGMENTS, ROLLBACK_SEGMENT_INITIAL, and ROLLBACK_SEGMENT_COUNT are correctly set for the instance with the problem. Also check that the instance is using the correct initialization parameter file. Make sure you are not confused about the difference between private and public rollback segments. See the Oracle DB Error ORAcle9i Database Administrator's Guide for more information about using rollback segments in parallel mode.

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