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多项选择题 You issue this SQL command to perform an online backup of the USER_DATA tablespace:ALTER TABLESPACE user_data BEGIN BACKUP;Next, you issue an operating system command to back up user_data01.dbf, the file that belongs to the USER_DATA tablespace. You then experience an instance failure.  Which three statements are true?()

A、A

B、B

C、C

D、D

E、E

  • B,C,D
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