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Which three statements are true about the stages of database startup？（）
A:Data files and redo log files can be renamed at the MOUNT stage.
B:Control files are read at the OPEN stage for the location of data files.
C:Control files are required to bring the database to the NOMOUNT stage.
D:Data files and redo log files are made available to users at the OPEN stage.
E:Data files and online redo log files are checked for consistency while opening the database

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出自：Oracle认证

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