The AP, the RM, and the TM communicate via three distinct interfaces: native, TX, and XA.
The native interface is the medium by which the AP makes requests directly to the RM. This interface is RM specific. In the Sybase XA environment, the native interface is either Embedded SQL or Client-Library.
The TX Interface is the medium between the AP and the TM. The AP uses TX calls to delineate transaction boundaries. In other words, the AP requests that the TM start and commit or roll back global transactions, via the TX Interface. This interface is TM specific.
The XA Interface is the medium between the RM and the TM. The DTM XA Interface is Sybase’s version of the interface for Adaptive Server. Using XA calls, the TM tells the RM when transactions start, commit, and roll back. The TM also handles recovery.
