RMAN_BACKUP_LOOKBACK_DAYS

Valid Values: A positive integer. (Default = 1)

Scope: During the first collection, the RMAN collector will collect session and backup details for the number of days as set by this parameter. If this parameter is not set, the default value is 1 day.

The RMAN collector chooses the start time as the last "session time" collected for. However, if this start time is more than the number of days (as set by this parameter), RMAN_BACKUP_LOOKBACK_DAYS takes the precedence.

Example:

The last "session time" collected for RMAN is Feb 5, 2018 and the current date is Mar 12, 2018.

If this parameter is set as 5 days, then the RMAN collector will collect the session and backup information only for the past 5 days.

If this parameter is set as 50 days, then RMAN collector will collect the session and backup information from Feb 5, 2018 until Mar 12, 2018.