User-defined breakpoints are activated when you set them with
    the SET BREAK command. Predefined breakpoints are activated by
    default. Use the ACTIVATE BREAK command to activate one or more
    breakpoints that you deactivated with DEACTIVATE BREAK.

    Activating and deactivating breakpoints enables you to run and
    rerun your program with or without breakpoints without having to
    cancel and then reset them. By default, the RERUN command saves
    the current state of all breakpoints (activated or deactivated).

    You can activate and deactivate user-defined breakpoints or
    predefined breakpoints or both. To check if a breakpoint is
    activated, use the SHOW BREAK command.

    Related commands:

       CANCEL ALL
       RERUN
       (SET,SHOW,CANCEL,DEACTIVATE) BREAK
       (SET,SHOW) EVENT_FACILITY