PDB Pluggable Database是12c中扛鼎的一个新特性， 但是对于CDB中的PDB，默认启动CDB时不会将所有的PDB带起来，这样我们就需要手动alter pluggable database ALL OPEN;     例如：

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
SQL> startup ;
ORACLE instance started.Total System Global Area 1419685888 bytes
Fixed Size                  2288344 bytes
Variable Size             536872232 bytes
Database Buffers          872415232 bytes
Redo Buffers                8110080 bytes
Database mounted.
Database opened.
SQL> select con_id,name,open_mode from v$pdbs;CON_ID NAME                           OPEN_MODE
---------- ------------------------------ ----------2 PDB$SEED                       READ ONLY3 MACC                           MOUNTED

可以通过添加Trigger的形式来客制化startup时自动将PDB OPEN:

CREATE TRIGGER open_all_pdbsAFTER STARTUPON DATABASE
BEGINEXECUTE IMMEDIATE 'alter pluggable database all open';
END open_all_pdbs;
/Trigger created.SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
SQL> startup;
ORACLE instance started.Total System Global Area 1419685888 bytes
Fixed Size                  2288344 bytes
Variable Size             536872232 bytes
Database Buffers          872415232 bytes
Redo Buffers                8110080 bytes
Database mounted.
Database opened.
SQL> select con_id,name,open_mode from v$pdbs;CON_ID NAME                           OPEN_MODE
---------- ------------------------------ ----------2 PDB$SEED                       READ ONLY3 MACC                           READ WRITENOTE: dependency between database MAC and diskgroup resource ora.DATADG.dg is established
alter pluggable database all open
Sun Jul 07 01:40:59 2013
This instance was first to open pluggable database MACC (container=3)
Opening pdb MACC (3) with no Resource Manager plan active
Pluggable database MACC opened read write
Completed: alter pluggable database all open
Starting background process CJQ0

使用SYS用户创建如下触发器即可：

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本文转自maclean_007 51CTO博客，原文链接:http://blog.51cto.com/maclean/p2