A special Oracle Rdb data type designed to handle large pieces
    of data with a segmented internal structure. The maximum size
    of a string segment is 64K bytes. Except for the length of the
    string's segments, Oracle Rdb does not know anything about the type
    of data contained in a segmented string. In a segmented string,
    you can store large amounts of text, long strings of binary input
    from a data collecting device, or graphic data. A program can
    then extract the data from the database and handle it in the
    appropriate way.