在Oracle 12.1.0.1版本中,在cdb数据库启动过程中,业务pdb无法自动open,如果要实现该功能,需要人工写触发器来实现cdb open后,pdb 给open起来.在12.1.0.2及其以后版本,可以通过设置ALTER PLUGGABLE DATABASE PDB SAVE STATE来实现在cdb open之后业务pdb能够自动open.
数据库启动后pdb未自动open

XFF_CDB$ROOT@SYS> startup
ORACLE 例程已经启动。
Total System Global Area  805306368 bytes
Fixed Size                  3050800 bytes
Variable Size             394265296 bytes
Database Buffers          297795584 bytes
Redo Buffers                5337088 bytes
In-Memory Area            104857600 bytes
数据库装载完毕。
数据库已经打开。
XFF_CDB$ROOT@SYS> select * from v$version;
BANNER                                                                               CON_ID
-------------------------------------------------------------------------------- ----------
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production              0
PL/SQL Release 12.1.0.2.0 - Production                                                    0
CORE    12.1.0.2.0      Production                                                        0
TNS for 64-bit Windows: Version 12.1.0.2.0 - Production                                   0
NLSRTL Version 12.1.0.2.0 - Production                                                    0
XFF_CDB$ROOT@SYS> show pdbs;
    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 PDB                            MOUNTED

查询dba_pdb_saved_states无记录

XFF_CDB$ROOT@SYS>  select con_name, state from dba_pdb_saved_states;
未选定行

在数据库mount状态下save state

XFF_CDB$ROOT@SYS>  ALTER PLUGGABLE DATABASE PDB save state;
插接式数据库已变更。
XFF_CDB$ROOT@SYS>  select con_name, state from dba_pdb_saved_states;
未选定行

pdb为mount状态下,执行save state无记录,证明save state不成功

在数据库open状态下save state—-设置pdb随cdb启动

XFF_CDB$ROOT@SYS> ALTER PLUGGABLE DATABASE PDB open;
插接式数据库已变更。
XFF_CDB$ROOT@SYS>  ALTER PLUGGABLE DATABASE PDB save state;
插接式数据库已变更。
XFF_CDB$ROOT@SYS> col con_name for a20
XFF_CDB$ROOT@SYS>  select con_name, state from dba_pdb_saved_states;
CON_NAME             STATE
-------------------- --------------
PDB                  OPEN

pdb为open状态下,执save state成功.
需要注意save state需要在pdb open情况下执行才能够生效.

重启数据库测试pdb随cdb启动

XFF_CDB$ROOT@SYS> shutdown immediate
数据库已经关闭。
已经卸载数据库。
ORACLE 例程已经关闭。
XFF_CDB$ROOT@SYS> startup
ORACLE 例程已经启动。
Total System Global Area  805306368 bytes
Fixed Size                  3050800 bytes
Variable Size             364905168 bytes
Database Buffers          327155712 bytes
Redo Buffers                5337088 bytes
In-Memory Area            104857600 bytes
数据库装载完毕。
数据库已经打开。
XFF_CDB$ROOT@SYS> show pdbs;
    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 PDB                            READ WRITE NO

禁用pdb随cdb启动—DISCARD STATE

XFF_CDB$ROOT@SYS>  ALTER PLUGGABLE DATABASE PDB DISCARD  state;
插接式数据库已变更。
XFF_CDB$ROOT@SYS>  select con_name, state from dba_pdb_saved_states;
未选定行
XFF_CDB$ROOT@SYS> shutdown immediate;
数据库已经关闭。
已经卸载数据库。
ORACLE 例程已经关闭。
XFF_CDB$ROOT@SYS> startup
ORACLE 例程已经启动。
Total System Global Area  805306368 bytes
Fixed Size                  3050800 bytes
Variable Size             364905168 bytes
Database Buffers          327155712 bytes
Redo Buffers                5337088 bytes
In-Memory Area            104857600 bytes
数据库装载完毕。
数据库已经打开。
XFF_CDB$ROOT@SYS> show pdbs;
    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 PDB                            MOUNTED
XFF_CDB$ROOT@SYS>

12.1.0.1中设置pdb随cdb启动

CREATE TRIGGER open_all_pdbs
   AFTER STARTUP
   ON DATABASE
BEGIN
   EXECUTE IMMEDIATE 'alter pluggable database all open';
END open_all_pdbs;
/