The CICS/VSAM ECCR sends changes to a single PowerExchange Logger.

The CICS/VSAM ECCR must run on the same z/OS system as the PowerExchange Logger and PowerExchange Agent.

However, if you use the Post-Log Merge option of the PowerExchange Logger, you can capture changes that originate from different z/OS systems. In this case, run a PowerExchange Logger on each z/OS system from which CICS transactions write changes to the VSAM source data sets.

Operational issues in the PowerExchange Logger, such as waits for tape mounts, can cause CICS transactions to enter a wait state and hold up all CICS tasks. After you resolve the PowerExchange Logger issues and CICS transactions resume processing, PowerExchange resumes capturing and recording change data without any data loss.

To ensure that change data capture proceeds without interruption, monitor PowerExchange Logger processing.