Rman parameter MINIMIZE LOAD/DURATION/PARTIAL 的使用

Note these issues when using DURATION and MINIMIZE LOAD with a tape backup:

Efficient backup to tape requires tape streaming. If you use MINIMIZE LOAD, RMAN may reduce the rate of backup to the point where tape streaming is not optimal.
RMAN will hold the tape resource for the entire duration of the backup window. This prevents the use of the tape resource for any other purpose during the backup window.
Because of these concerns, it is not recommended that MINIMIZE LOAD be used with tape. See "Factors Affecting Backup Speed to Tape" for more details on efficient tape handling.

关键字 partial 可以拟制rman在备份无法在指定的时间内完成时发出错误消息

eg:
RMAN> BACKUP AS COPY DURATION 2:00  PARTIAL MINIMIZE LOAD DATABASE;

备份持续到2点,并且使用MINIMIZE LOAD对磁盘进行I/O操作,如果2点未备份完成不发生错误提示