When global buffers are enabled, the NUMBER IS clause is used to
    specify the default number of global buffers per node.

    In database parameter syntax, a user designates an attach to the
    database, not a person who uses the database.

    The default number of global buffers is the maximum number
    of users multiplied by 5. (In the RDO syntax for database
    parameters, a user is the same as an attach.) You can override
    the default by defining a value for the logical name RDM$BIND_
    BUFFERS.

    Although you can change the NUMBER IS parameter online, the
    change will only take effect the next time that the database is
    opened. By default, a database can be opened automatically (that
    is, by any user who invokes the database and executes a data
    manipulation language statement). If the database was modified
    so that it must be manually opened, the RMU/OPEN command must be
    used to open it.