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DURATION Parameter
Control backup rate
More flexible and intuitive than RATE parameter
Notes:
The BACKUP DURATION parameter will do one of two things for you:
If MINIMIZE LOAD is specified, RMAN will reduce resource consumption so that the job requires the amount of time specified. This is like the RATE parameter, but perhaps more intuitive.
IF MINIMIZE LOAD is not specified, the time specified is the maximum time the BACKUP can execute. RMAN will kill the job when it reaches the specified time limit.
Unfortunately the “PLUS ARCHIVELOG” option is not currently supported when the DURATION parameter is specified.