Overriding system initialization parameters during startup

After you have started the initialization of CICS®, you might want to override system initialization parameters specified in the SIT, PARM parameter, and SYSIN data set of the CICS startup procedure. You can do this by specifying new values for system initialization parameters at the system console.

Before you begin

You can specify system initialization parameters at the system console only if the CONSOLE keyword was specified in either the PARM parameter or in the SYSIN data set. If you specify the CONSOLE (or CN) keyword in the PARM statement of the EXEC PGM=DFHSIP statement or SYSIN data set of your CICS startup procedure, CICS prompts you to enter system initialization parameters at the system console.

About this task

Generally, CICS does not begin to read from the console until it has loaded the SIT and processed any initialization parameters that are coded in the PARM parameter and the SYSIN data set.

When it is ready to read parameters from the console, CICS displays the following message (where nn is the reply ID): 
nn DFHPA1104 applid - SPECIFY ALTERNATIVE SIT PARAMETERS, IF ANY,
                      AND THEN TYPE '.END'.

Procedure

  1. Specify a SIT system initialization parameter only as the first parameter when prompted by message DFHPA1921.
    At this point CICS tries to load the specified SIT.
    If you try to specify a SIT system initialization parameter after CICS has loaded the SIT, it is rejected as an error.
  2. You can enter as many initialization parameters as you can get on one line of the console, but you must use a comma to separate parameters.
    CICS continues to prompt for system initialization parameters with displays of message DFHPA1105 .
  3. When you have changed the appropriate initialization parameter, terminate the console input by entering the END control keyword.