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How You Override Initialization Values at Startup Time

To override values defined on the MIMINIT statement or on the PARM parameter of the EXEC statement of the startup procedure, specify new values on the z/OS START command. All of the parameters that you can specify on the z/OS START command are found on the MIMINIT statement.

You can override a parameter only if you defined a symbolic variable for that parameter on the PARM parameter of the startup procedure, and you specified that parameter on the PROC statement of the startup procedure. Also, you must specify the symbolic variable as a parameter on the z/OS START command, rather than specifying name of the parameter (unless the name of the parameter is the same as its symbolic variable).

For example, suppose you use the symbolic variable CMNDS to represent the COMMANDS parameter on the PROC statement in your startup procedure. To make CA MIM use the member named NEWCMNDS during this execution (instead of the member identified on the CMNDS variable in the start-up procedure), you can specify CMNDS=NEWCMNDS on the z/OS START command:

S MIMGR,CMNDS=NEWCMNDS

CMNDS=NEWCMNDS overrides the variable for the CMNDS parameter on the PROC statement because the PROC statement recognizes CMNDS as a symbolic variable. If you specify COMMANDS=&CMNDS in the PROC statement, then the PROC statement substitutes the value COMMANDS=NEWCMNDS.