CPI Communications

This topic introduces CPI Communications driven application programs and distributed Syncpoint protected conversations.

CPI-C driven application programs
A CPI Communications driven application program can use IMS-managed resources in two ways: by using the SQL calls to access Db2 for z/OS® through the IMS External Subsystem (ESS) Attach Facility and by using the APSB call to allocate IMS resources.
RRS and distributed syncpoint/protected conversations
Regardless of whether the SYNCLVL setting is NONE, CONFIRM, or SYNCPOINT, if RRS=Y, z/OS Resource Recovery Services is the sync point manager and coordinates the update and recovery of multiple protected resources. RRS controls how and when protected resources are committed by coordinating with the resource managers, such as IMS, that have registered with RRS.
Activating protected conversations
z/OS uses a construct with z/OS Resource Recovery Services (RRS) called a context.

Parent topic: CPI Communications and APPC/IMS