Oracle RAC客户端tnsnames.ora相关配置及测试

1.Oracle RAC服务端/etc/hosts部分内容如下

2.查看服务端的local_listener和remote_listener参数

3.客户端tnsnames.ora配置参考

• 3.1 10g的版本，监听配置方法如下
• 3.2 11g的版本，监听配置方法如下
• 3.3 业务分割，连接到实例1的业务
• 3.4 业务分割，连接到实例2的业务

4.测试failover功能

1. Oracle RAC服务端/etc/hosts部分内容如下

#public ip
172.16.7.112  jyracdb1
172.16.7.114  jyracdb2 
#virtual ip
172.16.7.113  jyracdb1-vip
172.16.7.115  jyracdb2-vip
#scan ip(11g RAC 新特性)
172.16.7.120 jyracdb-scan

2. 查看服务端的local_listener和remote_listener参数

## 2.1 节点1 Oracle用户登录sqlplus / as sysdba ##

SQL> show parameter listener

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
listener_networks                    string
local_listener                       string       (ADDRESS=(PROTOCOL=TCP)(HOST=
                                                 172.16.7.113)(PORT=1521))
remote_listener                      string      jyracdb-scan:1521
SQL> 

2.2 节点2 Oracle用户登录sqlplus / as sysdba

SQL> show parameter listener

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
listener_networks                    string
local_listener                       string       (ADDRESS=(PROTOCOL=TCP)(HOST=
                                                 172.16.7.115)(PORT=1521))
remote_listener                      string      jyracdb-scan:1521
SQL> 

3. 客户端tnsnames.ora配置参考

3.1 10g的版本，监听配置方法如下

需要指定每一个节点的vip

jyzhao =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.7.113)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.7.115)(PORT = 1521))
    (LOAD_BALANCE = yes)
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = jyzhao)
      (FAILOVER_MODE =
           (TYPE = session)
           (METHOD = basic)
           (RETRIES = 180)
           (DELAY = 5)  
      )
    )
  )

3.2 11g的版本，监听配置方法如下

11g引进scanIP的新特性，即只需要指定scanIP，不再需要指定vip，对于RAC增加节点不需要再重新配置所有客户端的tnsnames.ora。 当然不用scanIP，还用之前的vip也是可以的。

jyzhao_scan =
 (DESCRIPTION =
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.7.120)(PORT = 1521))
   )
   (CONNECT_DATA =
     (SERVICE_NAME = jyzhao)
     (FAILOVER_MODE =
          (TYPE = session)
          (METHOD = basic)
          (RETRIES = 180)
          (DELAY = 5)  
     )
   )
 )

3.3 业务分割，连接到实例1的业务

当实例1正常时，固定连接到实例1：

jyzhao1 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.7.113)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = jyzhao)
    )
  )

3.4 业务分割，连接到实例2的业务

当实例2正常时，固定连接到实例2：

jyzhao2 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.7.115)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = jyzhao)
    )
  )

4. 测试failover功能

如下面的测试用例： 确定开始随机连接到的是实例2，然后杀掉实例2， 此时查询`select instance_name, status from v$instance;`，会报错ORA-25408， 再次查询，发现已经自动failover到实例1。

C:Documents and SettingsAdministrator>sqlplus jingyu/jingyu@jyzhao

SQL*Plus: Release 11.2.0.1.0 Production on Tue Jul 28 11:04:13 2015

Copyright (c) 1982, 2010, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management,
OLAP,
Data Mining and Real Application Testing options

SQL> select instance_name, status from v$instance;

INSTANCE_NAME    STATUS
---------------- ------------
jyzhao2          OPEN


SQL> select instance_name, status from v$instance;
select instance_name, status from v$instance
*
ERROR at line 1:
ORA-25408: can not safely replay call

SQL> select instance_name, status from v$instance;

INSTANCE_NAME    STATUS
---------------- ------------
jyzhao1          OPEN