Specifies one, two, or three threshold values. The threshold
    values represent a fullness percentage on a data page and
    establish four possible ranges of guaranteed free space on the
    data pages. When a data page reaches the percentage defined by
    a given threshold value, the SPAM entry for the data page is
    updated to reflect the new fullness percentage and its remaining
    free space.

    The default thresholds are 70,85, and 95 percent. If you specify
    only one or two values, unspecified values default to 100
    percent. You can specify the THRESHOLDS option only on a storage
    area for a multifile database. Threshold values can be set for
    storage areas with MIXED or UNIFORM storage area page formats.