The IMS synchronous ECCR must log all changes to a single PowerExchange Logger running on the same MVS image.

The PowerExchange Logger and PowerExchange Agent must run on the same MVS image as the IMS synchronous ECCR.

In configurations where updates to an IMS database occur on multiple MVS images, you must configure an IMS synchronous ECCR, PowerExchange Logger, and PowerExchange Agent on each MVS image. On all MVS images, configure the PowerExchange Logger to use Post-Log Merge.

Operational issues in the PowerExchange Logger can cause IMS transactions to wait. While transactions wait, PowerExchange cannot capture changes. After you resolve the PowerExchange Logger issues, the transactions can resume and PowerExchange can capture and log change data without any data loss.

Monitor the PowerExchange Logger closely to ensure that change data capture proceeds without interruption.