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单选题
You are managing a single instance Oracle 10g database that utilizes the following parameters:  Which of the following set of commands must you execute to enable Flashback Database?()
A

  STARTUP MOUNT EXCLUSIVE  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN;

B

  STARTUP MOUNT  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN RESETLOGS;

C

  STARTUP MOUNT EXCLUSIVE  ATLER DATABASE ARCHIVELOG;  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN RESETLOGS;

D

  STARTUP MOUNT  ALTER DATABASE ARCHIVELOG;  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN;


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