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简介：十年以上 MySQL Oracle DBA 从业者，MySQL 5.7 OCP，微信号: jinjushuke
以后有一个 PDB 关上模式为 READ WRITE
[oracle@DGMOGGM19C ~]$ sql sys@192.168.3.107:1521/pdb1 as sysdba
SQLcl: Release 19.1 Production on Wed Aug 23 10:19:47 2023
Copyright (c) 1982, 2023, Oracle. All rights reserved.
New version: 23.2.0 available to download
Password? (?)
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 – Production
Version 19.3.0.0.0
SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
3 PDB1 READ WRITE NO SQL> connect / as sysdba
Connected.
SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
2 PDB$SEED READ ONLY NO
3 PDB1 READ WRITE NO 实例 shutdown 后再 startup，PDB1 为 mount 状态
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 1140850592 bytes
Fixed Size 9133984 bytes
Variable Size 738197504 bytes
Database Buffers 385875968 bytes
Redo Buffers 7643136 bytes
Database mounted.
Database opened.
SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
2 PDB$SEED READ ONLY NO
3 PDB1 MOUNTED NO SQL>
启动 PDB1 后，保留 PDB1 关上模式状态
SQL> alter pluggable database pdb1 open;
Pluggable database altered.
SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
2 PDB$SEED READ ONLY NO
3 PDB1 READ WRITE NO SQL> alter pluggable database all save state;
Pluggable database altered.
SQL> select con_name,state from dba_pdb_saved_states;
CON_NAME STATE
PDB1 OPEN
再重启实例试试，查看 PDB1 的默认状态
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 1140850592 bytes
Fixed Size 9133984 bytes
Variable Size 738197504 bytes
Database Buffers 385875968 bytes
Redo Buffers 7643136 bytes
Database mounted.
Database opened.
SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
2 PDB$SEED READ ONLY NO
3 PDB1 READ WRITE NO SQL>
当初 PDB1 的关上模式主动为读写了。