If you move a database from one system to another, or when memory
    usage or system parameters change, you may have to modify the
    global buffer parameters for a database when it is not possible
    to open the database. This situation could occur, for example, if
    you have insufficient available physical or virtual memory.

    The RMU Set Global_Buffers command allows you to alter some
    of the global buffer-related parameters without opening the
    database. This allows you to reconfigure the database so that
    it can be opened and accessed on the system.