628.The database is running in the ARCHIVELOG mode. It has three redo log groups with one member each. One of the redo log groups has become corrupted. You have issued the following command during the recovery of a damaged redo log file:
ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3;
Which action should you perform immediately after using this command?
A. You should perform a log switch
B. You should make a backup of the database
C. You should switch the database to the NONARCHIVELOG mode
D. You should shut down the database instance and perform a complete database recovery
Answer: B
使用此命令清除了在线重做日志，以前的备份就失效了，所以需要重新备份数据库。
ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3;
Which action should you perform immediately after using this command?
A. You should perform a log switch
B. You should make a backup of the database
C. You should switch the database to the NONARCHIVELOG mode
D. You should shut down the database instance and perform a complete database recovery
Answer: B
使用此命令清除了在线重做日志，以前的备份就失效了，所以需要重新备份数据库。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2126139/ ，如需转载，请注明出处，否则将追究法律责任。
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