Recover the datafile - recover datafile 'fullpath/filename'

恢复数据文件 —— recover datafile 'fullpath/filename'。

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Add a new member to the group - Alter database add logfile member '/fullpath/log_filename.

将新的成员添加到这个组 —— Alter database add logfile member '/fullpath/log_filename.log' reuse to group n;

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