Delta Query Support for OData Services Exposed in NetWeaver Gateway
Convert MBO-based delta-tracking mechanisms to OData service delta-tracking mechanisms.
Comparing SAP Mobile Platform Version 2.x and 3.x Delta Tracking
- SAP Mobile Platform 2.<x>
uses replication-based synchronization between a client-side database
and server-side cache database (CDB) to provide data communication
between mobile applications and back-end systems. The CDB tracks deltas
between back-end systems and the clients. To track changes:
- SAP Mobile Platform Server must query the back end for all data, and check each row for changes, for example, by using a Scheduled or On-Demand cache group policy, or,
- The back-end system must post changes as they occur to the CDB, for example, by using data change notification (DCN). This option is more efficient, because it does not require each row of data to be checked for changes.
- SAP Mobile Platform 3.<x> delta tracking is managed by the back-end system. OData services can use delta queries and delta tokens to mimic 2.<x> CDB delta-tracking capabilities.