Increasing the Maximum Size of VARCHAR2, NVARCHAR2, and RAW Columns in an Oracle RAC Database?

In document of Oracle, it explained

To increase the maximum size of VARCHAR2, NVARCHAR2, and RAW columns in an Oracle RAC database:

Shut down all of the Oracle RAC database instances, except one.
Restart the Oracle RAC database instance in UPGRADE mode.
Change the setting of MAX_STRING_SIZE to EXTENDED.
Run the rdbms/admin/utl32k.sql script in the Oracle RAC database instance. You must be connected AS SYSDBA to run the script.
Restart all Oracle RAC database instances in NORMAL mode.
Run the rdbms/admin/utlrp.sql script to recompile invalid objects. You must be connected AS SYSDBA