PowerExchange for IDMS CDC can capture changes asynchronously from IDMS logs. For IDMS asynchronous change data capture, PowerExchange uses the IDMS log-based ECCR. The IDMS log-based ECCR runs in a separate address space. It reads IDMS archive logs to capture change data. When IDMS archives an active journal, PowerExchange for IDMS CDC records the new archive log in the Log Catalog. The IDMS log-based ECCR periodically checks the Log Catalog for new archive logs from which to capture changes and passes any changes from those logs to the PowerExchange Logger for recording.