Parameters that control the characteristics of the database root
    file or characteristics stored in the database root file that
    apply to the entire database. You can specify these parameters
    for either single-file or multifile databases.

    Some database root file parameters specified in the CREATE
    DATABASE statement cannot be changed with the ALTER DATABASE
    statement. To change these database root file parameters,
    you must use the EXPORT and IMPORT statements. See the EXPORT
    statement and the IMPORT statement for information on exporting
    and importing your database.