The XPARM control module can be updated/activated while the IMS Data Capture Agent is operational, allowing you to change parameters in the XPARM control module without having to recycle the IMS message/control regions.
The dynamic real-time update is enabled through the XPARM Dynamic Update Routine, SQDAUPDX, which places a copy of the XPARM control module for the data capture agent in common storage (CSA). The supplied JCL procedure, SQDAUPDX can be used to perform the real-time dynamic update of the XPARM control module.