（多选题）
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？（）
ASet the UNDO_RETENTION parameter to AUTO.
BCreate an initial undo segment in undotablespace.
CSet the UNDO_RETENTION parameter to 900 or more
DSet the initialization parameter UNDO_MANAGEMENT to AUTO
ESet the UNDO_MANAGEMENT parameter to the name of an undotablespace
正确答案
答案解析
略
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