When analyzing a system dump, selects a processor to become the
    current CPU for SDA. When invoked under ANALYZE/SYSTEM, SET CPU
    lists the database address for the specified CPU before exiting
    with the message:

    %SDA-E-CMDNOTVLD command not valid on the running system

    Format

      SET CPU  {cpu-id | /FIRST | /NEXT | /PRIMARY } [/NOLOG]