The selected Oracle database is not configured to use the AL32UTF8 character set

 While running the RCU, below error comes if the database is not configured to use the AL32UTF8 character set -

In order to change the character set in the database, follow the next steps.

1. Open SQLplus and login using a sysdba role

2. One by one, execute the next statements.

shutdown immediate;
startup restrict;
alter database character set internal_use AL32UTF8;
alter database character set AL32UTF8;
shutdown immediate;
startup;

3. Exit SQL Plus