The WRITEAPPEND procedures provide the capability to add data to the end of a large object.
>>-DBMS_LOB.WRITEAPPEND_BLOB--(--lob_loc--,--amount--,--buffer--)-><
>>-DBMS_LOB.WRITEAPPEND_CLOB--(--lob_loc--,--amount--,--buffer--)-><
EXECUTE privilege on the DBMS_LOB module.