40.A database is configured in ARCHIVELOG mode A full RMAN backup exists but no control file backup to trace has been taken A media failure has occurred In which two scenarios is incomplete recovery required（）?
A、after losing all copies of the control file
B、after losing a sysaux tablespace data file
C、after losing all members of the CURRENT online redo log group
D、after losing all members of an INACIIVE online redo log group
E、after losing an UNDO tablespace that is in usehttp://www.cndba.cn/hbhe0316/article/108650http://www.cndba.cn/hbhe0316/article/108650http://www.cndba.cn/hbhe0316/article/108650http://www.cndba.cn/hbhe0316/article/108650

答案:AChttp://www.cndba.cn/hbhe0316/article/108650http://www.cndba.cn/hbhe0316/article/108650

而使用recover database using backup controlfile;实际上是告诉数据库，我要联机日志的最大scn为终点，对数据文件在block级别进行恢复。recover database using backup controlfile until cancel,既可以完全恢复，也可以指定归档日志、联机日志不完全恢复。http://www.cndba.cn/hbhe0316/article/108650

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