Oracle recommends that instead of using rollback segments in your database, you use an undo tablespace. This requires the use of a different set of initialization parameters, and optionally, the inclusion of the UNDO TABLESPACE clause in your CREATE DATABASE statement.
You must include the following initialization parameter if you want to operate your database in automatic undo management mode:
UNDO_MANAGEMENT=AUTO
In this mode, rollback information, referred to as undo, is stored in an undo tablespace rather than rollback segments and is managed by Oracle. If you want to create and name a specific tablespace for the undo tablespace, you can include the UNDO TABLESPACE clause at database creation time. If you omit this clause, and automatic undo management is specified, Oracle creates a default undo tablespace named SYS_UNDOTBS
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You must include the following initialization parameter if you want to operate your database in automatic undo management mode:
UNDO_MANAGEMENT=AUTO
In this mode, rollback information, referred to as undo, is stored in an undo tablespace rather than rollback segments and is managed by Oracle. If you want to create and name a specific tablespace for the undo tablespace, you can include the UNDO TABLESPACE clause at database creation time. If you omit this clause, and automatic undo management is specified, Oracle creates a default undo tablespace named SYS_UNDOTBS
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