1. Which two are true about RMAN duplexed backup sets（）?
   A、They can be written to media
   B They can be created only by using the copies option of a BACKUP command
   C、They can be created by using the RMAN CONFIGURE command to specify duplexing before taking a backup .
   D、They can be written only to disk.
   E、They must be written to media

答案:AChttp://www.cndba.cn/hbhe0316/article/108619http://www.cndba.cn/hbhe0316/article/108619http://www.cndba.cn/hbhe0316/article/108619http://www.cndba.cn/hbhe0316/article/108619http://www.cndba.cn/hbhe0316/article/108619http://www.cndba.cn/hbhe0316/article/108619

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