ORA-14694: database must in UPGRADE mode to begin MAX_STRING_SIZE migration
Cause:
An attempt was made to update the MAX_STRING_SIZE parameter to EXTENDED when the database was not in UPGRADE mode.
Action:
Restart the database in UPGRADE mode, modify the parameter, run the utl32k.sql script in $ORACLE_HOME/rdbms/admin, and restart the database in normal mode.
