RMAN-06479：warning
错误码
错误描述：warning
错误原因：The CHANGE CONTROLFILECOPY AVAILABLE command was used, but the control file copy cannot be found on disk.
解决方法：If the storage containing the control file copy has been removed from the host, restore it and retry the command. If the control file copy is permanently gone, then issue the CHANGE CONTROLFILECOPY DELETE command for this control file.
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