To rename database national character set

When creating a new database, the NCHAR was not set properly for 11GR2. We followed the below steps in order to change NCHAR set.

Steps to be followed,

Step 1: shutdown immediate;

Step 2: startup mount;

Step 3: alter system enable restricted session;

Step 4: alter system set job_queue_processes=0;

Step 5: alter system set aq_tm_processes=0;

Step 6: alter database open;

Step 7: alter database national character set UTF8;

Step 8: shutdown immediate;

Step 9: Startup

Step 10: Check NCHAR values