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> 

alert日志：

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