Oracle 12C -- 设置CDB启动后，PDBs自动启动

CDB重启后，PDBs默认是处于mounted状态

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> startup
ORACLE instance started.

Total System Global Area  bytes
Fixed Size                   bytes
Variable Size              bytes
Database Buffers           bytes
Redo Buffers                bytes
Database mounted.
Database opened.
SQL> select name,open_mode from v$pdbs;

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

SQL> 

命令"alter pluggable database ... save state"，可以让CDB重启后，pdb维持其关机前的状态。
取消设置使用"alter pluggable database ... discard state"。

SQL> select name,open_mode from v$pdbs;

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

SQL> alter pluggable database pdb1 save state;

Pluggable database altered.

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

Total System Global Area  bytes
Fixed Size                   bytes
Variable Size              bytes
Database Buffers           bytes
Redo Buffers                bytes
Database mounted.
Database opened.
SQL> select name,open_mode from v$pdbs;

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

SQL>