211.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? Choose two.
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
这道题有个题库选CE，有个题库选DE
我感觉只有D正确，勉强可以选择C
