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DCMT VARY PROGRAM Usage

DCMT VARY PROGRAM Limitations

The following restrictions apply:

• Only one parameter can be modified per DCMT statement.
• The only parameter that cannot be changed is the RESIDENT parameter.
• You can change the LANGUAGE or TYPE parameters of a program only if the program is DISABLED.

How DC/UCF Searches for a Program

The load list enabled for your current terminal session determines how DC/UCF searches for a program based on a DCMT DISPLAY PROGRAM command.

New Copy Request From an Offline Load Library

A new copy request for a program from a load library is varied offline is delayed until the library is varied online.

New Copy Request and System Control and Driver Tasks

System control tasks (task threads 0 and 1) and driver tasks are never aborted or placed in a wait state because of a VARY NEW COPY request. Any new copy request that results in such an action is rejected.

Disabling the NEW COPY Facility

The NEW COPY facility can be enabled or disabled for a program at system generation time by the NEW COPY parameter of the PROGRAM statement. Disabling new copy for a program prevents the issuing of a new copy request for that program.

New Copy Request and z/VM Users

'z/VM': You should not use the NEW COPY option for programs stored in a load library because the old copy of the minidisk directory is still in storage.

More Information

• For more information about varying the status of a load library, see DCMT VARY LOADLIB.
• For more information about defining load lists, see documentation of the LOADLIST statement in the System Generation Guide.
• For more information about how to dynamically define programs at runtime and then vary attributes for those programs, see DCMT VARY DYNAMIC PROGRAM.
• For more information about how DC/UCF uses a load list to search for a program, see the System Operations Guide.
• For more information about PDEs, see the System Generation Guide.
• For more information about displaying information about active programs, see the section DCMT DISPLAY ACTIVE PROGRAMS.
• For more information about displaying information about programs defined to the system, see the section DCMT DISPLAY PROGRAM.