ORA-65045
If you saw ORA-65045 like this:
SQL> alter database rename global_name to ORCLPDBX;
alter database rename global_name to ORCLPDBX
*
ERROR at line 1:
ORA-65045: pluggable database not in a restricted mode
Or this:
SQL> alter pluggable database ORCLPDB rename global_name to ORCLPDBX;
alter pluggable database ORCLPDB rename global_name to ORCLPDBX
*
ERROR at line 1:
ORA-65045: pluggable database not in a restricted mode
ORA-65045 means that you should enable restricted mode to limit public connections on the pluggable database (PDB) for further operation.