Determines whether the database must be invoked by path name for
    data definition changes to occur. If you specify the DICTIONARY
    IS REQUIRED option, the database must be invoked by path name to
    change metadata and the data dictionary will be maintained. If
    you specify the DICTIONARY IS NOT REQUIRED option, the database
    can be invoked by either file name or path name to change
    metadata. The default is DICTIONARY IS NOT REQUIRED.

    If you specify the DICTIONARY option, you cannot specify any
    other options in the same CHANGE DATABASE statement.