Identify the advantage of recovery an image copy of a datafile during RMAN backup.(Choose all thar apply.)
A. During media recovery, fewer incremental updates need to be applied to the last image copy.
B. The overhead for the block change tracking file is minimal.
C. You do not need to perform additional image copy backups.
D. You no longer need to duplex your backups.
E. The time required to perform the backup and incremental updates to the image copy is reduced.
Answer: A C
题意是：RMAN采用镜像文件恢复的优势是什么？
A、需要较少的增量更新到最新的镜像副本；
C、不需要执行额外的镜像文件复制；
B是错误的，因为块更改跟踪文件用于提高备份集的增量备份速度，对于恢复没有影响；
D是错误的，这与双工备份不相关；
E是错误的，原有的镜像副本不影响新的镜像副本创建；来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2124943/ ，如需转载，请注明出处，否则将追究法律责任。
