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After performing a clean shut down of the database instance for maintenance， you mount the database andthen execute a command to open the database：SQL> ALTER DATABASE OPEN； Which two statements are true（）
A:The online redo log files and online data files are opened.
B:All the online data file headers are checked for consistency.
C:Instance recovery is performed before opening the database.
D:The path and existence of all the log file members are checked

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出自：Oracle认证

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