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。

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