Hi Jeyaram, The polling interval for real-time trending depends on your driver/protocol. In your protocol there will be some timers defined and in most cases this will be linked with the polling intervals to retrieve information from your device and store this into parameters in DataMiner (see screenshot for an example of timers). When the driver updates a parameter in DataMiner that has real-time trending it will add an extra trend point to your graph. So if you have a lot of real-time trending on a lot of parameters that update a lot you will have a very big load on your DB.

For average trending you have 5 min average records, hour records and day records that are stored in DB. Depending on your settings these can be kept longer in your system (see screenshot). So DataMiner will keep the average, min and max value of every parameter and store this value every 5 min (if a change was detected).

Note:
It is possible to change the 'Timer base' for every element (see screenshot) to increase or decrease the frequency to which your timers are executed.