How to start pluggable database in oracle 19c ?

 Start pluggable database in oracle 

SQL> 

SQL> alter session set container=pdb$seed;

Session altered.

SQL> 

SQL> show con_name

CON_NAME

------------------------------

PDB$SEED

SQL> 

SQL> 

SQL> alter pluggable database pdb open read write;

alter pluggable database pdb open read write

*

ERROR at line 1:

ORA-65118: operation affecting a pluggable database cannot be performed from

another pluggable database

SQL> alter session set container=pdb;

Session altered.

SQL> show con_name

CON_NAME

------------------------------

PDB

SQL> 

SQL> alter pluggable database pdb open read write;

Pluggable database altered.

SQL> 

SQL> show pdbs

    CON_ID CON_NAME   OPEN MODE  RESTRICTED

---------- ------------------------------ ---------- ----------

3 PDB   READ WRITE NO

SQL>