HiRDB uses the X/Open XA interface for linkage to OLTP. This interface, which is based on the X/Open standards, specifies the connection between the transaction manager (TM) and the resource manager (RM) in a distributed transaction processing (DTP) system. Use of the XA interface enables the resource manager's transaction processing to be controlled by the transaction manager. To do this, you must link the library provided by the transaction manager to your UAP.

HiRDB provides the HiRDB XA library so that it can control UAP processing. This library conforms to the XA interface specifications of the X/Open DTP software architecture. Figure 2-7 shows the position of HiRDB in an X/Open DTP model.

Figure 2-7 Position of HiRDB in X/Open DTP model