SQL Error: ORA-12712: new character set must be a superset of old character set

Question

I want to change character set of oracle database from \'WE8MSWIN1252\' to \'AL32UTF8\'

I tried to execute following steps from the link (http://download.oracle.com/

Answer 1

Below worked for me in 19C.

Issue

import done in AL32UTF8 character set and AL16UTF16 NCHAR character set export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set Warning: possible data loss in character set conversions

Steps

Database started in Restriction mode.

SQL> select * from nls_database_parameters where parameter='NLS_CHARACTERSET';

PARAMETER

VALUE

NLS_CHARACTERSET AL32UTF8

SQL> alter database character set WE8MSWIN1252; alter database character set WE8MSWIN1252 * ERROR at line 1: ORA-12712: new character set must be a superset of old character set

SQL> alter database character set INTERNAL_USE WE8MSWIN1252;

Database altered.

SQL> select * from nls_database_parameters where parameter='NLS_CHARACTERSET';

PARAMETER

VALUE

NLS_CHARACTERSET WE8MSWIN1252

SQL>

Cheers! RaJ...