Performance Manager stores the data from a data collection task in a database. Depending on how often the data collection task is scheduled to run and the configuration of the storage device, the database might fill up. Multiple Device Manager (MDM) provides database size monitoring and database purging to help you manage the database.
Gauges in graphical and tabular form, which you define, are saved in the Performance Manager database. When data pertaining to a defined gauge is requested from Performance Manager, Performance Manager builds a query to the database, retrieves the data, and returns it to the requester.