Two-phase commit prerequisites

The prerequisites for two-phase commit processing with TCP/IP are:

The prerequisites for two-phase commit processing with Local Option are:

Note: RRS must be installed and running for two-phase commit processing to occur. IMS and IMS Connect must also be enabled for RRS processing. (If you are using two-phase commit processing with Local Option, IMS Connect does not need to be enabled for RRS processing.) You can enable RRS processing on IMS Connect by either issuing the IMS Connect command, SETRRS ON or set RRS=Y in the IMS Connect configuration file. To ensure IMS is enabled with RRS, check that the RRS value in the startup parameter within your IMS environment is set to Y. This will appear in the job logs generated when IMS is brought up.

Additionally, to run two-phase commit IMS, IMS Connect, and RRS must all be in the same MVS™ image. For more information about two-phase commit, see Two-phase commit environment considerations.

Related concepts
Global transaction support with two-phase commit
Using global transaction support in your application
Related reference
Two-phase commit environment considerations
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