Two-Phase Commit Processing › Two-Phase Commit within CA IDMS › External Coordinators and Participants

External Coordinators and Participants

External Coordinators

A central version can participate in a two-phase commit operation controlled by the following external coordinators:

• CICS Transaction Server
• RRS-IBM's system-level resource recovery platform for z/OS
• An XA transaction manager supported by CA IDMS Server

By participating in externally-controlled transactions, updates to CA IDMS resources can safely be coordinated with those of other resource managers supported by the above transaction managers.

Note: For more information about CICS Transaction Server and RRS, see the CA IDMS System Operations Guide.

External Participants

A central version can coordinate transactions in which external resource managers are participants. It does this in one of two ways: by enlisting the services of RRS or by using a resource manager interface tailored to both the CA IDMS environment and the external resource manager.

If the external resource manager supports RRS as a coordinator, using RRS as an intermediary is the easiest way for an external resource manager to participate in a transaction coordinated by a central version. In this way, any resource manager that supports RRS as a coordinator can potentially participate in a CA IDMS-controlled transaction.

If the resource manager does not support RRS as a coordinator, then an interface that is tailored to the external resource manager and that supports the CA IDMS transaction manager protocol must be written to enable the resource manager to be a direct participant in a CA IDMS-controlled transaction.