oracle12c CDB与PDB 启动与关闭操作

2020-08-27 10:58:21

Oracle 12c中，增加了可插接数据库的概念，即PDB，允许一个数据库容器(CDB)承载多个可插拔数据库(PDB)。

CDB全称为Container Database，中文翻译为数据库容器，PDB全称为Pluggable Databa

Oracle 12c中，增加了可插接数据库的概念，即PDB，允许一个数据库容器(CDB)承载多个可插拔数据库(PDB)。

CDB全称为Container Database，中文翻译为数据库容器，PDB全称为Pluggable Database，即可插拔数据库。

在ORACLE 12C之前，实例与数据库是一对一或多对一关系(RAC)：即一个实例只能与一个数据库相关联，数据库可以被多个实例所加载。

而实例与数据库不可能是一对多的关系。当进入ORACLE 12C后，实例与数据库可以是一对多的关系。

下面是官方文档关于CDB与PDB的关系图。

SQL*Plus: Release 12.2.0.1.0 Production on Thu Aug 27 11:00:30 2020

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to:

Oracle Database 12c Standard Edition Release 12.2.0.1.0 - 64bit Production

SQL> show con_name;

CON_NAME

------------------------------

CDB$ROOT

SQL>

SQL> select con_id, dbid, guid, name , open_mode from v$pdbs;

CON_ID       DBID GUID                                                    NAME                                     OPEN_MODE

---------- ---------- ------------------------------------------------------- ---------------------------------------- ----------

2 3259249228 ADD3A480C914424FE0539931622B080E                        PDB$SEED                                 READ ONLY

3 2070728781 ADD3B397B78F4EF4E0539931622B9C5F                        DB12CPDB                                 MOUNTED

SQL>

Database closed.

Database dismounted.

ORACLE instance shut down.

我们关闭CDB也会把PDB 关闭掉。

启动CDB

SQL> startup;

ORACLE instance started.

Total System Global Area 9495904256 bytes

Fixed Size                 12341248 bytes

Variable Size            2214592512 bytes

Database Buffers         7247757312 bytes

Redo Buffers               21213184 bytes

Database mounted.

Database opened.

SQL>

SQL> select con_id,dbid,guid,name,open_mode from v$pdbs;

CON_ID       DBID GUID                                                    NAME                                     OPEN_MODE

---------- ---------- ------------------------------------------------------- ---------------------------------------- ----------

2 3259249228 ADD3A480C914424FE0539931622B080E                        PDB$SEED                                 READ ONLY

3 2070728781 ADD3B397B78F4EF4E0539931622B9C5F                        DB12CPDB                                 MOUNTED

SQL>