ORA-14696: MAX_STRING_SIZE migration is incomplete for pluggable database string
Cause:
An attempt was made to open the database in normal mode before the MAX_STRING_SIZE migration process completed for the specified pluggable database.
Action:
Restart the database in UPGRADE mode, run the utl32k.sql script in $ORACLE_HOME/rdbms/admin in the specified pluggable database, and restart the database in normal mode.