Indeed - For Aggregation to work properly, in a vest number of scenarios, it is best to have "Custom Description" as a column in the element. This will allow the use of filtering to sum groups of IDX, or any other operator native to Aggregation.

In the event that fixed indexes, you may want to adapt the following connector from Cisco to Fortinet, which sum parameters selected from a drop-down list. Telefonia por Cable S.A de C.V. Bandwidth Aggregator | Catalog

Hi Martin,

I am not sure if it is possible (out of the box) to execute this aggregation and offload the result to an external DB.

The most straight approach is to update the driver to have this aggregation implemented.

Another approach that does not require updating the driver implies using the Data Aggregator. Keep in mind that this approach will allow you to generate CSV files with the required information, but it will not perform the the 'offload to DB' operation.

Data Aggregator allows you to execute GQI queries at scheduled times. The result can be stored in a CSV file. To retrieve history data using a GQI query, you could use the data source Get parameter by table ID. You can perform the sum operation using SLC-GQIO-AddColumns

Hope it helps.

Have you tried DataMiner's Aggregation function?