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You work as a database administrator for Supportcenter.cn. Your database is in the MOUNT state and you execute the following command to open it ALTER DATABASE OPEN； What two actions are performed as a result of this command？（）
A:All control files are opened
B:All redo files are opened
C:The password file is opened
D:The parameter file is opened
E:All online data files are opened

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出自：Oracle认证

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