Oracle 12C -- shutdown CDB

SQL> select name,open_mode from v$pdbs;

NAME                           OPEN_MODE
------------------------------ ----------
PDB$SEED                       READ ONLY
PDB1                           READ WRITE
PDB2                           READ WRITE

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

Shutting down instance (immediate)
Stopping background process SMCO
Shutting down instance: further logons disabled
Sun Nov 01 16:10:03 2015
Stopping background process CJQ0
Stopping background process MMNL
Stopping background process MMON
License high water mark = 23
Sun Nov 01 16:10:05 2015
All dispatchers and shared servers shutdown
ALTER DATABASE CLOSE NORMAL
Sun Nov 01 16:10:06 2015
SMON: disabling tx recovery
Sun Nov 01 16:10:06 2015
Stopping Emon pool
Stopping Emon pool
Sun Nov 01 16:10:08 2015
SMON: disabling cache recovery
Sun Nov 01 16:10:08 2015
Shutting down archive processes
Archiving is disabled
Sun Nov 01 16:10:08 2015
Thread 1 closed at log sequence 19
Successful close of redo thread 1
Completed: ALTER DATABASE CLOSE NORMAL
ALTER DATABASE DISMOUNT
Shutting down archive processes
Archiving is disabled
Completed: ALTER DATABASE DISMOUNT
Sun Nov 01 16:10:09 2015
ARCH: Archival disabled due to shutdown: 1089
Shutting down archive processes
Archiving is disabled
Sun Nov 01 16:10:09 2015
Stopping background process VKTM
Sun Nov 01 16:10:09 2015
ARCH: Archival disabled due to shutdown: 1089
Shutting down archive processes
Archiving is disabled
Sun Nov 01 16:10:19 2015
Instance shutdown complete