Data sources on z/OS

The Data Source name in the Compute and Database nodes identifies the location of the table referred to in the respective node's ESQL. Data sources on z/OS® correspond to DB2® subsystems rather than DB2 databases. The DB2 owning region for a particular database table is identified using a combination of the DSNAOINI file and DB2 subsystem configuration.

The MVSDEFAULTSSID parameter in the DSNAOINI file identifies the local DB2 subsystem to which the broker is connected. This subsystem is used to locate the data source which is either a local or remote DB2. The mapping between a particular data source and DB2 subsystem is shown in the DSNTIPR installation panel of the default DB2 subsystem and SYSIBM.LOCATIONS table.

When you access remote DB2 subsystems, ensure that the DBRMs for ODBC are bound at the remote subsystem. For more information, refer to the 'Programming for ODBC' topics in the DB2 Information Management Software Information Center for z/OS Solutions .

If you need to access databases that are not on DB2 on z/OS, you can use the DB2 Distributed Data Facility (DDF) and Distributed Relational Architecture (DRDA®) to incorporate a remote unit of work within a message flow.