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HomeDatabaseMysql TutorialOracle 12C 数据库管理 小结

Oracle 12C引入了CDB与PDB的新特性,在ORACLE 12C数据库引入的多租用户环境(Multitenant Environment)中,允许一个数据库容器(

Oracle 12c 数据库管理 总结

新安了个12c的rac 环境,进去创建用户和表才发现,12c对数据库管理做了一些变更,再网上搜了一些文章,总结一下,方便以后使用。

Oracle 12C引入了CDB与PDB的新特性,在ORACLE 12C数据库引入的多租用户环境(Multitenant Environment)中,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。

其实大家如果对sql server比较熟悉的话,这种CDB与PDB是不是感觉和SQL SERVER的单实例多数据库架构是一回事呢。像PDB$SEED可以看成是master、msdb等系统数据库,PDBS可以看成用户创建的数据库。而可插拔的概念与SQL SERVER中的用户数据库的分离、附加其实就是那么一回事。看来ORACLE也“抄袭”了一把SQL SERVER的概念,只是改头换面的包装了一番。

Oracle 单实例 从32位 迁移到 64位 方法 

在CentOS 6.4下安装Oracle 11gR2(x64)

Oracle 11gR2 在VMWare虚拟机中安装步骤

Debian 下 安装 Oracle 11g XE R2

Oracle RAC 11.2(12C)正确关闭顺序 

CDB组件(Components of a CDB)

一个CDB数据库容器包含了下面一些组件:

ROOT组件

ROOT又叫CDB$ROOT, 存储着ORACLE提供的元数据和Common User,元数据的一个例子是ORACLE提供的PL/SQL包的源代码,,Common User 是指在每个容器中都存在的用户。

SEED组件

  Seed又叫PDB$SEED,这个是你创建PDBS数据库的模板,你不能在Seed中添加或修改一个对象。一个CDB中有且只能有一个Seed. 这个感念,个人感觉非常类似SQL SERVER中的model数据库。

PDBS

    CDB中可以有一个或多个PDBS,PDBS向后兼容,可以像以前在数据库中那样操作 PDBS,这里指大多数常规操作。

这些组件中的每一个都可以被称为一个容器。因此,ROOT(根)是一个容器,Seed(种子)是一个容器,每个PDB是一个容器。每个容器在CDB中都有一个独一无二的的ID和名称。

1)连接到CDB数据库

连接到CDB数据库容器非常简单,跟以前连接数据库是一样的

[oracle@get-orasvr02 ~]$ sqlplus / as sysdba
 SQL*Plus: Release 12.1.0.1.0 Production on Sun Oct 20 23:41:36 2013Copyright (c) 1982, 2013, Oracle. 
 All rights reserved.Connected to an idle instance.
 SQL>
 [oracle@getorasvr02 ~]$ sqlplus sys/password  as sysdba
 SQL*Plus: Release 12.1.0.1.0 Production on Sun Oct 20 23:43:17 2013Copyright (c) 1982, 2013, Oracle.
  All rights reserved.Connected to an idle instance.
 SQL>

2)查看数据库是否为CDB

SQL> select name, decode(cdb, 'YES', 'Multitenant Option enabled', 'Regular 12c Database: ') "Multitenant Option" , open_mode, con_id from v$database;
 NAME      Multitenant Option                  OPEN_MODE                CON_ID
 --------- -----------------------------  --------------------        ----------
Epps      Multitenant Option enabled            READ WRITE                  0

YES表示该数据库是CDB,如果是NO表示是NO-CDB(普通数据库)

3)查看当前容器(Container)

3.1

SQL> show con_name
 CON_NAME
 ------------------------------
 CDB$ROOT
 SQL> select sys_context('userenv', 'con_name') "Container DB" from dual;
 Container DB
 ----------------------------------------------------
 CDB$ROOT
 SQL>

4)查看CDB容器中的PDBS信息

查看CDB中有多少个pluggable database

SQL>  select con_id, dbid, guid, name , open_mode from v$pdbs;   
 CON_ID      DBID GUID                            NAME                          OPEN_MODE
 ---------- ---------- -------------------------------- ------------------------------ ---------       
2 4071321146 E89E8DA2866E3157E043DE07A8C09238 PDB$SEED        READ ONLY      3 1930201447 E89E9418B882350CE043DE07A8C092B6 PDBEPPS          MOUNTED
 SQL>

5)启动PDB数据库

方式1:

SQL> alter pluggable database PDBEPPS open;
 Pluggable database altered.
 SQL> select con_id, dbid, guid, name , open_mode from v$pdbs;   
 CON_ID      DBID GUID                            NAME                          OPEN_MODE
 ---------- ---------- -------------------------------- ------------------------------ ----------       
2 4071321146 E89E8DA2866E3157E043DE07A8C09238 PDB$SEED  READ ONLY        3 1930201447 E89E9418B882350CE043DE07A8C092B6 PDBEPPS        READ WRITE

方式2:

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