No notion of client context

The OLE DB provider has no notion of a client context. The OLE DB provider is entirely stateless, and there is no persistence across queries in the same connection. This means that you must set the value of a AVEVA Historian time domain extension (for example, cycle count) each time you execute a query.

Also, the OLE DB provider cannot continuously return data (similar to a "hot" link in InTouch HMI software). The OLE DB specification (as defined by Microsoft) does not permit a provider to return rows to a consumer without a request from the consumer.