16806, 0000, "supplemental logging is not turned on"
*Cause: Supplemental logging was not turned on while there was a logical
standby database in the configuration. This could happen either
on the primary database or on the logical standby database that
was being switched over to be the primary database.
*Action: Check the Data Guard broker log for more details. Issue the ALTER
DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY, UNIQUE INDEX)
COLUMNS to add supplemental logging.