Oracle RAC客户端tnsnames.ora相关配置及测试 – AlfredZhao

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

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/[email protected]

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

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