MN

The MN system initialization parameter specifies whether monitoring is to be switched on or off at initialization.

MN={OFF|ON}
Use the individual monitoring class system initialization parameters to control which monitoring classes are to be active (see the MNEXC, MNPER, and MNRES parameter descriptions.) The default status is that the CICS® monitoring facility is off. The monitoring status is recorded in the CICS global catalog for use during warm and emergency restarts.
OFF
Switch off monitoring.
ON
Turn on monitoring. However, unless at least one individual class is active, no monitoring records are written.
Note:
  1. If the monitoring status is ON, CICS accumulates monitoring data continuously. For each monitoring class that is active, CICS writes the monitoring data to a system management facilities (SMF) data set. If the monitoring status is OFF, CICS does not accumulate or write any monitoring data, even if any of the monitoring classes are active.
  2. You can change the monitoring status and the monitoring class settings at any time, as follows:
    • During a warm restart by coding system initialization parameters in PARM, SYSIN, or through the system console.
    • While CICS is running, using:
      • The monitoring facility transaction CEMN.
      • The CEMT SET MONITOR command.
      • The EXEC CICS SET MONITOR command.

    When you change the status of monitoring, the change takes effect immediately. If you change the monitoring status from OFF to ON, monitoring starts to accumulate data and write monitoring records to SMF for all tasks that start after the status change is made, for all active monitoring classes. If the status is changed from ON to OFF, monitoring stops writing records immediately and does not accumulate monitoring data for any tasks that start after the status change is made.

  3. The monitoring status setting can be manipulated independently of the class settings. This means that, even if the monitoring status is OFF, you can change the monitoring class settings, and the changes take effect for all tasks that are started after the monitoring status is next set to ON.