A LOB is a large object type. This release of SQL*Loader supports loading of four LOB data types:
BLOB: a LOB containing unstructured binary data
CLOB: a LOB containing character data
NCLOB: a LOB containing characters in a database national character set
BFILE: a BLOB stored outside of the database tablespaces in a server-side operating system file
LOBs can be column data types, and except for NCLOB, they can be an object's attribute data types. LOBs can have an actual value, they can be null, or they can be "empty."
"Loading LOBs" for details on using SQL*Loader control file data definition language to load these LOB types