You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN).
Identify two scenarios is which you must have a recovery catalog. (Choose two.)
A. To store the backup information of multiple database
B. To restrict the amount of space that is used by the backups
C. To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME
parameter.
D. To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.
此题考点是必须是用 catalog 的情况。 catalog 是一个数据库方案，来维护 RMAN 资料数据据，支持一个或多个目标数据库。
如果不使用 catalog，RMAN 备份信息存放在控制文件中，只能记录自身的备份情况。要记录多个数据库备份情况统一管理，必须使用 catalog。 A 正确
B,C 不使用 catalog 也能完成。错误
D.如果不使用 catalog，不能使用时间参数，会出现 RMAN-06137: must have recovery catalog forREPORT SCHEMA AT TIME 错误。 D 对.
如果要在 RMAN 中存储脚本，那么也必须使用 catalog