CREATE ROLLBACK SEGMENT

The Oracle RDBMS CREATE ROLLBACK SEGMENT statement createS a rollback segment (RBS).
This is an object that Oracle Database uses to store data necessary to reverse, or undo, changes made by transactions.

The general format is:

CREATE [PUBLIC] ROLLBACK SEGMENT rbs_name options
options:
TABLESPACE tablespace_name
STORAGE storage_clause

Example 1:

CREATE ROLLBACK SEGMENT rbs1 TABLESPACE rbsspace;
ALTER ROLLBACK SEGMENT rbs1 ONLINE;