In Oracle 9i, the database introduced Unicode data types—NCHAR, NVARCHAR2, and NCLOB. Data stored in columns of Unicode date types are exclusively stored in their own Unicode encodings regardless of database character set.

Beginning in In OpenEdge 10.1C, the DataServer for Oracle recognizes Oracle Unicode data types and processes them during schema pulling and beyond. By recognizing Unicode data types NCHAR, NVARCHAR2, and NCLOB, the DataServer for Oracle performs data conversion through the OCI.