Thresholds=(val1[,val2[,val3]])

    Updates the database root file to reflect the threshold
    information for the storage areas in the storage-area-list. Use
    this qualifier when the threshold values have changed since the
    backup file from which you are restoring the root was created.
    This qualifier does not change the attributes of the storage area
    it qualifies; its purpose is to update the database root file
    with corrected information.

    This is a positional qualifier.

    The Thresholds qualifier applies only to storage areas with a
    mixed page format.

    If you do not use the Thresholds qualifier with the RMU Restore
    Only_Root command, Oracle Rdb uses the storage area's thresholds
    as recorded in the backup file.

    See the Oracle Rdb7 Guide to Database Performance and Tuning for
    more information on SPAM thresholds.