Which two statements are true regarding this backup?(Choose two.)
A. The backup contains data files,the server parameter file,and the control file even if the control file autobackup is disabled.
B. The KEEP option overrides the configured retention policy.
C. The backup contains only data files and archived redo log files.
D. The KEEP option is an attribute of an individual backup piece.
答案：（A、B）
解析：
BACKUP命令
C（X），使用KEEP选项时，RMAN创建的备份是自包含的，会备份数据文件、归档重做日志文件、控制文件、服务器参数文件。
D（X），KEEP是备份集的属性