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- 多项选择题You require the Oracle server to manage the undo segments and space among various active sessions automatically. You created an undo tablespace， UNDO_TBS1， in your database. Which two additional steps would you perform to achieve this？（）
A、Set the UNDO_RETENTION parameter to 900 or more.
B、Create an initial undo segment in the undo tablespace.
C、Enable the retention guarantee for the undo tablespace.
D、Set the UNDO_TABLESPACE parameter to UNDO_TBS1.
E、Set the UNDO_MANAGEMENT initialization parameter to AUTO.
- D,E
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