External subsystem attach facilities

IMS provides several options for accessing external subsystems from an IMS system.

IMS provides several options for accessing external subsystems from an IMS system:
  • The DB2® Attach Facility
  • The External Subsystem Attach Facility (ESAF)
  • A callout request to either of the IMS Connect TCP/IP clients: the IMS TM Resource Adapter or the IMS Enterprise Suite SOAP Gateway
The callout request is documented in the following places:

These topics describe how to access external data using both the DB2 Attach Facility and the External Subsystem Attach Facility (ESAF). The topics provide an overview of the DB2 Attach Facility and ESAF, as well as detailed information on creating the external subsystem module table, and ESAF processing.

This topic contains General-use Programming Interface information.