这篇文章主要介绍CDB和PDB的基本管理,资料来源oracle官方。
基本概念:
Multitenant Environment:多租户环境
CDB(Container Database):数据库容器
PDB(Pluggable Database):可插拔数据库
CDB与PDB关系图
COMMON USERS(普通用户):经常建立在CDB层,用户名以C##或c##开头;
LOCAL USERS(本地用户):仅建立在PDB层,建立的时候得指定CONTAINER。
在oracle 12c中,使用了一个container(容器)的概念,让我们先看看官方的对它的介绍,为了保留最原始的意思,这里引用英文而不翻译了。
The data dictionary in each container in a CDB is separate, and the current container is the container whose data dictionary is used for name resolution and for privilege authorization. The current container can be the root or a PDB. Each session has exactly one current container at any point in time, but it is possible for a session to switch from one container to another.
Each container has a unique ID and name in a CDB. You can use the CON_ID and CON_NAME parameters in the USERENV namespace to determine the current container ID and name with the SYS_CONTEXT function.
1、查看Oracle 12c的版本
SQL> select * from v$version;
SQL>select sys_context ('USERENV', 'CON_NAME') from dual;
SYS_CONTEXT('USERENV','CON_NAME')
----------------------------------------------------------------------------------------------------
CDB$ROOT
2、我们可以通过ALTER SESSION SET CONTAINER 指定其他容器
SQL>select con_id,dbid,NAME,OPEN_MODE from v$pdbs;
3、将Pdb open:
SQL> alter pluggable database pdborcl open;
4、查看容器
SQL>select con_id,dbid,NAME,OPEN_MODE from v$pdbs;
5、切换容器到pdb
SQL> alter session set container=PDBORCL;
6、查看当前使用容器
SQL>select sys_context ('USERENV', 'CON_NAME') from dual;
7、创建用户
SQL>create user informix identified by gmgl; SQL>grant dba to informix;
11g
,你应该在12c
。