11g R2 RAC客户端负载均衡配置

11g R2 RAC客户端负载均衡配置

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Oracle High Availability--RAC
2012-06-26 11:01
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1、在服务端查看数据库版本和service_name：

[oracle@rac121 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Tue Jun 26 10:44:24 2012

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

SQL> show parameter service_name

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
service_names                        string      racdb
SQL>

2、查看服务端数据库RAC配置：

SQL> host cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost.localdomain localhost
::1             localhost6.localdomain6 localhost6
#202.106.199.39         rac121
#Public
10.1.252.121            rac121
10.1.252.122            rac122
#Private
192.168.123.1           rac121-priv
192.168.123.2           rac122-priv

#Virtual IP
10.1.252.75             rac121-vip
10.1.252.76             rac122-vip
10.1.252.68             rac-scan

SQL>

3、在客户端配置tnsnames.ora ,添加内容如下：

racdb=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.252.75)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.252.76)(PORT = 1521))
(LOAD_BALANCE = on)
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = racdb)
)
)

4、在客户端打开SQLPLUS测试：

开启第1个sqlplus：

SQL> conn sys/system@racdb as sysdba
已连接。
SQL> show parameter instance_name

NAME            TYPE                VALUE
-------------   --------------      -----------
instance_name   string              racdb2

开启第2个sqlplus：

SQL> conn sys/system@racdb as sysdba
已连接。
SQL> show parameter instance_name

NAME               TYPE               VALUE
---------------    ---------------    ---------------
instance_name      string             racdb1
SQL>

开启第3个sqlplus：

SQL> conn sys/system@racdb as sysdba
已连接。
SQL> show parameter instance_name

NAME               TYPE               VALUE
---------------    ---------------    ---------------
instance_name      string             racdb2
SQL>

开启第4个sqlplus：

SQL> conn sys/system@racdb as sysdba
已连接。
SQL> show parameter instance_name

NAME               TYPE               VALUE
---------------    ---------------    ---------------
instance_name      string             racdb1
SQL>

这样当客户端连接RAC数据库时,会随机在TNS里面挑个监听地址进行连接。