单选题Which of the following commands cannot be executed when the database open？（）ARECOVER DATABASEBRECOVER TABLESPACECRECOVER DATAFILEDALTER DATABASE RECOVER DATAFILE
单选题
Which of the following commands cannot be executed when the database open？（）
A
RECOVER DATABASE
B
RECOVER TABLESPACE
C
RECOVER DATAFILE
D
ALTER DATABASE RECOVER DATAFILE
参考解析
解析：
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