[Oracle 工程师手记]如何设置RAC环境自动启动 PDB

RAC环境如何设置当CDB打开时,PDB 也打开呢?

我需要用到 alter pluggable database orclpdb1 save state 语句。

具体过程,如下面的例子:


在第一个节点执行:

[oracle@orc01 ~]$ export ORACLE_SID=orclcdb1
[oracle@orc01 ~]$ sqlplus / as sysdba

SQL> show pdbs;

   CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
        2 PDB$SEED                       READ ONLY  NO
        3 ORCLPDB1                       MOUNTED
        4 ORCLPDB2                       MOUNTED
SQL>

<<<<< 打开数据库后,执行 “save state" 语句:

SQL> alter pluggable database orclpdb1 open;
SQL> alter pluggable database orclpdb1 save state;


<<<<< 重启数据库:

[oracle@orc01 ~]$ srvctl stop database -db orclcdb
[root@orc02 ~]# srvctl start database -db orclcdb


<<<<< 可以看到,此时,数据库自动打开了(READ WRITE):

[oracle@orc01 ~]$ export ORACLE_SID=orclcdb1
[oracle@orc01 ~]$ sqlplus / as sysdba

SQL> show pdbs;

   CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
        2 PDB$SEED                       READ ONLY  NO
        3 ORCLPDB1                       READ WRITE NO  ***
        4 ORCLPDB2                       MOUNTED
SQL>


<<<<< 但是我们到另外一个节点去看,看到的是,这个PDB 并没有被打开。

[oracle@orc02 ~]$ export ORACLE_SID=orclcdb2
[oracle@orc02 ~]$ sqlplus / as sysdba


SQL> show pdbs;

   CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
        2 PDB$SEED                       READ ONLY  NO
        3 ORCLPDB1                       MOUNTED ***
        4 ORCLPDB2                       MOUNTED
SQL> 

 
可以说,PDB 数据库的 save state ,是以节点(instance) 为单位的。


那么,如何再各个节点,都自动打开PDB呢,可以指明 instance 名字:

SQL> alter pluggable database orclpdb1 save state instances=('orclcdb1','orclcdb2');

[oracle@orc01 ~]$ srvctl stop database -db orclcdb
[oracle@orc01 ~]$
[oracle@orc01 ~]$ srvctl start database -db orclcdb

节点一查看:

SQL> show pdbs;

   CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
        2 PDB$SEED                       READ ONLY  NO
        3 ORCLPDB1                       READ WRITE NO
        4 ORCLPDB2                       MOUNTED
SQL>


节点二查看:

SQL> show pdbs;

   CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
        2 PDB$SEED                       READ ONLY  NO
        3 ORCLPDB1                       MOUNTED
        4 ORCLPDB2                       MOUNTED

 还有一个问题需要注意,如果设置了 PDB 自动打开之后,我怎么知道我已经设置过了呢?可以查询:

SELECT con_name, instance_name, state FROM dba_pdb_saved_states;

 

 

 

 

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