BYTE_SUBSTR64 and BYTE_SUBSTR return the long binary byte substring of the LONG BINARY column parameter.
The BYTE_SUBSTR64 and BYTE_SUBSTR functions also support the LONG VARCHAR data type and LONG BINARY and LONG VARCHAR variables of any data size.
CHAR_LENGTH64 also supports LONG VARCHAR variables of any data size.
If you are licensed to use the Unstructured Data Analytics functionality, you can use this function with large object data.
See BYTE_SUBSTR64 and BYTE_SUBSTR Functions in Unstructured Data Analytics.