【单选题】

You issued the RMAN>SHOW ALL； command. The output of this command is as follows： After analyzing the output， which conclusion will you draw？（）

A、  The current control file is not automatically backed up every time you perform a backup.

B、  The backups save space on the storage media.

C、  While performing backups across a network， the network bandwidth is reduced.

D、  The backups consist of backup pieces.

  题目答案

  答案解析

略