The IMS Monitor in DB/DC and DCCTL environments

The principal monitoring tool provided by IMS is the IMS Monitor. It is an integral part of the control program in the DB/DC environment. The counterpart of the IMS Monitor in the batch environment is the DB Monitor.

The IMS Monitor collects data while the DB/DC environment is operating. Information in the form of monitor records is gathered for all dispatch events and placed in a sequential data set. The IMS Monitor data set is specified on the IMSMON DD statement in the control region JCL; data is added to the data set when the /TRACE command activates the monitor. The MTO can start and stop the monitor, guided by awareness of the system's status, to obtain several snapshots.

Related reading: For more information on interpreting IMS Monitor reports, see Using IMS reports.