Oracle 11g RAC 客户端Tnsname配置

一、修改客户端服务器hosts记录

192.168.1.240 rac01

192.168.1.241 rac02

192.168.1.242 rac01-vip

192.168.1.243 rac02-vip

108.88.3.240 rac01-priv

108.88.3.241 rac02-priv

二、新建一条Tnsname 纪录

编辑客户端:tnsnames.ora 文件，增加如下：

RACDB =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = rac02-vip)(PORT = 1521))

    (ADDRESS = (PROTOCOL = TCP)(HOST = rac01-vip)(PORT = 1521))

    (LOAD_BALANCE = yes)

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = racdb)

       (FAILOVER_MODE=

         (TYPE = session)

         (METHOD = basic)

         (RETRIES = 180)

         (DELAY = 5) 

            )

    )

  )

三、测试RAC Failover

 1、RAC状态

[oracle@rac01 ~]$ crs_stat -t

Name           Type           Target    State     Host        

------------------------------------------------------------

ora....SM1.asm application    ONLINE    ONLINE    rac01       

ora....01.lsnr application    ONLINE    ONLINE    rac01                   

ora.rac01.gsd  application    ONLINE    ONLINE    rac01       

ora.rac01.ons  application    ONLINE    ONLINE    rac01       

ora.rac01.vip  application    ONLINE    ONLINE    rac01       

ora....SM2.asm application    ONLINE    ONLINE    rac02       

ora....02.lsnr application    ONLINE    ONLINE    rac02                 

ora.rac02.gsd  application    ONLINE    ONLINE    rac02       

ora.rac02.ons  application    ONLINE    ONLINE    rac02       

ora.rac02.vip  application    ONLINE    ONLINE    rac02       

ora.racdb.db   application    ONLINE    ONLINE    rac01       

ora....b1.inst application    ONLINE    ONLINE    rac01       

ora....b2.inst application    ONLINE    ONLINE    rac02       

[oracle@rac01 ~]$ 

2、客户端连接测试

[oracle@rac01 ~]$ sqlplus /nolog

SQL*Plus: Release 11.1.0.6.0 - Production on Mon Jul 16 21:59:20 2012

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

SQL> conn system/oracle@racdb

Connected.

SQL> select instance_name from v$instance;

INSTANCE_NAME

--------------------------------

racdb1

SQL> 

3、关闭节点racdb1实例

[oracle@rac01 ~]$ sqlplus '/ as sysdba';

SQL*Plus: Release 11.1.0.6.0 - Production on Mon Jul 16 22:00:17 2012

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production

With the Partitioning, Real Application Clusters, OLAP, Data Mining

and Real Application Testing options

SQL> shutdown abort

ORACLE instance shut down.

SQL> 

4、在原来客户端的会话上执行连妆测试，

SQL> conn system/oracle@racdb

Connected.

SQL> select instance_name from v$instance;

INSTANCE_NAME

--------------------------------

racdb1

SQL> /

select instance_name from v$instance

*

ERROR at line 1:

ORA-25408: can not safely replay call

SQL> /

INSTANCE_NAME

--------------------------------

racdb2

SQL> 

结论：在RAC环境中，同一会话，当前会话连接节点实例故障，可以快速的切替的另一节中运行，对客户端的是完全透明的。