Upgrade Considerations if Using Character-Set Conversion
Both the TRAILCHARSET and SOURCEDEF parameters are
            deprecated because Extract writes the source database character set with the column
            level. By default, these parameters are ignored but use the database character set and
            column character set from the table metadata. SOURCECHARSET parameter
            is only required  when you need to override the source database character set and must
            use it with the OVERRIDE option.