Officially an NCLOB is not supported in lower versions. Is there a way to make this work in a bare bones SRC -> TRANSFORMER -> TGT kind of job or something more complex? Please let me know in comments. In V11.5, define NCLOB as LONGNVARCHAR.
What is NCLOB?
NCLOB (National Character Large Object) is an Oracle data type that can hold up to 4 GB of character data. It’s similar to a CLOB, but characters are stored in a NLS or multibyte national character set.
Other details that may be useful
1. If you are using JAVA applications to modify the database columns, then you have to open streaming connections to write data for these columns, where the streaming connections can be ASCII or Binary connections.
2. From SQL plus it not possible to write as max value that can be written is 4000 chars.
3. From PL/SQL you have to use the dbms_lob.writeappend packages for inserting data.