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
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>
<h1 id="3">3. 客户端tnsnames.ora配置参考</h1>
<h2 id="3.1">3.1 10g的版本，监听配置方法如下</h2>
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)
)
)
)
<h2 id="3.2">3.2 11g的版本，监听配置方法如下</h2>
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)
)
)
)
<h2 id="3.3">3.3 业务分割，连接到实例1的业务</h2>
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)
)
)
<h2 id="3.4">3.4 业务分割，连接到实例2的业务</h2>
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)
)
)
<h1 id="4">4. 测试failover功能</h1>
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$instance;`，会报错ORA-25408，
再次查询，发现已经自动failover到实例1。
C:\Documents and Settings\Administrator>sqlplus jingyu/jingyu@jyzhao
SQL*Plus: Release 11.2.0.1.0 Production on Tue Jul 28 11:04:13 2015
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management,
OLAP,
Data Mining and Real Application Testing options
SQL> select instance_name, status from v$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