You performed the RMAN database backup with the KEEP option. 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.
在指定 KEEP 选项时，RMAN 会创建多个备份集。备份数据库文件，归档日志文件，控制文件和参数文件。和自动备份控制文件配置无关（即使配置了，也不会再次自动备份控制文件）
keep 选项不能覆盖在快速恢复区内的保留策略（在其他地方是覆盖保留策略的），必须指定备份到其他地方，如果在备份到恢复区时使用 keep，会出现一个错误。 keep forever 选项必须使用 catalog。