SQL> alter database force logging;
ORA-12920: database is already in force logging mode
Error in Dutch:
ORA-12920: Database staat al niet in de force logging-modus.
The word ‘niet’ should not be there!
The ‘opposite’ error:
SQL> alter database no force logging;
ORA-12921: database is not in force logging mode
ORA-12921: Database staat niet in de force logging-modus.