Oracle 19c Installer Can't Select National Character Set I am trying to install a new 19c instance of Oracle database in order to migrate a 12c database there. The 12c database uses a database character set of WE8ISO8859P1 and a national character set of AL16UTF16, both configured on installation.

I have found during the 19c installation, however, that there is no option to set the national character set. How can I be sure that this is configured to the correct AL16UTF16?
Just install the DB software then use DBCA to create the database.
There you can choose the national characterset.

Typically noone uses the installer to create a database. Some others (including me) avoid even DBCA.