open all pluggable databases -12c

SQL> select name, open_mode from v$pdbs;

NAME       OPEN_MODE
------------------------------ ----------
PDB$SEED       READ ONLY
PDBORCL       MOUNTED
PDBORCL2       MOUNTED
PDBORCL1       READ ONLY
PDBORCL3       READ WRITE

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount;
ORACLE instance started.

Total System Global Area  788529152 bytes
Fixed Size    2929352 bytes
Variable Size  541068600 bytes
Database Buffers  239075328 bytes
Redo Buffers    5455872 bytes
Database mounted.


SQL> ALTER DATABASE OPEN;

Database altered.

SQL> select name, open_mode from v$pdbs;

NAME       OPEN_MODE
------------------------------ ----------
PDB$SEED       READ ONLY
PDBORCL       MOUNTED
PDBORCL2       MOUNTED
PDBORCL1       MOUNTED
PDBORCL3       MOUNTED


SQL> ALTER PLUGGABLE DATABASE ALL OPEN;

Pluggable database altered.

SQL> select name, open_mode from v$pdbs;

NAME       OPEN_MODE
------------------------------ ----------
PDB$SEED       READ ONLY
PDBORCL       READ WRITE
PDBORCL2       READ WRITE
PDBORCL1       READ WRITE
PDBORCL3       READ WRITE