默认情况下，在CDB 启动的时候，all 的PDB 都是mount状态，也没有默认的机制，在CDB启动时自动启动PDB。
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这里我们通过触发器的方式实现。
CREATE OR REPLACE TRIGGER open_pdbs
AFTER STARTUP ON DATABASE
BEGIN
EXECUTE IMMEDIATE 'ALTER PLUGGABLE DATABASE ALL OPEN';
END open_pdbs;
/实验过程如下：
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 1560281088 bytes
Fixed Size 2924784 bytes
Variable Size 956305168 bytes
Database Buffers 587202560 bytes
Redo Buffers 13848576 bytes
Database mounted.
Database opened.
SQL> show pdbs
CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 PDB1 MOUNTED
SQL> CREATE OR REPLACE TRIGGER open_pdbs
2 AFTER STARTUP ON DATABASE
3 BEGIN
4 EXECUTE IMMEDIATE 'ALTER PLUGGABLE DATABASE ALL OPEN';
5 END open_pdbs;
6 /
Trigger created.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 1560281088 bytes
Fixed Size 2924784 bytes
Variable Size 956305168 bytes
Database Buffers 587202560 bytes
Redo Buffers 13848576 bytes
Database mounted.
Database opened.
SQL> show con_name
CON_NAME
------------------------------
CDB$ROOT
SQL> show pdbs
CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 PDB1 READ WRITE NO
SQL> 
