The Delete Aged Discovery Data task deletes aged client discovery data from the Configuration Manager 2007 site database. This data can include records resulting from heartbeat discovery, network discovery, and Active Directory Domain Services discovery methods (System, User, and System Group).
Databases at other sites are affected when you enable this task.
You can specify the age of the discovery data to be deleted. This command deletes everything relevant to those discovery items from the Configuration Manager 2007 site database.
Defaults Delete discovery data older than 90 days; runs on Saturday between midnight and 5:00 A.M..