If database itself is UTF-8 enabled and can do the required conversion, driver should not perform the conversion.
unfortunately, DD ODBC driver for Oracle mandates the use of WAPI calls even if target DB is able to perform the
conversion(i.e. database is UTF-8 enabled) . This u
nnecessary conversion is causing severe performance issues and more
details can be found in case #00448891. Oracle native driver behaves as expected and is way faster than DD'sOracle driver
in such scenarios.