Best approach to subscribe large amount of NodeId (~10,000)?

[ntdgo]

Hi,

I have an OPC UA server with 10,000 NodeID with update interval 1~10ms. I want to subscribe data changed for monitoring (display to DataGrid) and write the data to database.

My current approach is WPF app, which has a ObservableCollection of object that contains NodeId, MonitoredItem , NodeValue.
With each MonitoredItem, the MonitoredItem subscribe to Notification MonitoredItem.Notification += (m, e) => {UpdateValue;}

I have two problems with this approach:

1. UI update: It takes some delay to update value to UI.
2. At the Visual Studio Diagnostics Tool, the program generates many GC garbage collector.

→ I think my approach is the worst approach. Is there any better, efficient approach to solve subscribe large of NodeId?

Thank you!

[mregen]

Hi @DatDevSc, use the FastDataCallback but try to avoid a lot of processing of the data. Having data that changes very often in such a short timeframe may also benefit from setting a queue length per monitored item and set the publishing interval to a higher value. Also splitting the monitored items in multiple subscriptions may help distribute the load, because more Publishrequest service calls are used to process the data changes.