Undo Mode (30)

Undo mode provides a more flexible way to migrate from manual undo management
to automatic undo management. A database system can run in either manual undo
management mode or automatic undo management mode. In manual undo
management mode, undo space is managed through rollback segments. In automatic
undo management mode, undo space is managed in undo tablespaces. To use
automatic undo management mode, the database administrator needs only to create
an undo tablespace for each instance and set the UNDO_MANAGEMENT initialization
parameter to AUTO. You are strongly encouraged to run in automatic undo
management mode.

使用AUM:
1. 建立undo tablespace
2. UNDO_MANAGEMENT設定為AUTO

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