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You work as a database administrator for Supportcenter.cn. You want to create your database with the automatic undo management feature enable.Which two tasks must you perform to achieve this？（）
A:Set the UNDO_RETENTION parameter to AUTO.
B:Create an initial undo segment in undotablespace.
C:Set the UNDO_RETENTION parameter to 900 or more
D:Set the initialization parameter UNDO_MANAGEMENT to AUTO
E:Set the UNDO_MANAGEMENT parameter to the name of an undotablespace

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出自：Oracle认证

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