This ensures that all participants update or return to a consistent state. This external coordination support is provided by the underlying WebSphere MQ facilities on distributed systems, and by Resource Recovery Services (RRS) on z/OS.
The following databases provide the correct level of XA support for coordinating message flows on distributed systems:
Globally coordinated message flows that involve a DB2 resource manager are supported on DB2 Universal Database V8.
On z/OS, database support for coordinated message flows is provided by DB2 only.