ORACLE10gR2 RAC TAF配置与测试
ORACLE10gRAC TAF可以在客户端配置,通过配置tnsnames.ora实现,也可以在服务器端配置,通过DBMS_SERVICE包实现,服务器端的会复写客户端的配置.
通过配置客户端tnsnames.ora实现TAF
在客户端的tnsname.ora文件中加入下面的内容
RAC_TAF =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.localdomain)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.localdomain)(PORT = 1521))
(LOAD_BALANCE = yes)
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = RAC.WORLD)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
)
)
)
测试TAF
D:\>sqlplus /nolog
SQL*Plus: Release10.2.0.1.0 - Production on星期六4月18 09:55:13 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> conn system@rac_taf
输入密码:
已连接.
通过下面的语句可能查看当前连接的的是那个实例和failover_type
SQL> col instance_name format a13
SQL> col host_name format a16
SQL> col failover_method format a15
SQL> col failover_type format a13
SQL> col failed_over format a11
SQL> select instance_name ,host_name ,null as failover_type,
2 null as failover_method ,null as failed_over
3 from v$instance
4 union
5 select null ,null ,failover_type ,failover_method ,failed_over
6 from v$session
7 where sid=(select max(sid) from v$mystat)
8 /
INSTANCE_NAME HOST_NAME FAILOVER_TYPE FAILOVER_METHOD FAILED_OVER
------------- ---------------- ------------- --------------- -----------
RAC2 rac2.localdomain
SELECT BASIC NO
通过上面的结果我们可以看到,当前连接实例为:RAC2,没有进行TAF
通过srvctl关闭数据库模拟instance crash
[oracle@rac1 ~]$ srvctl status database -d rac
Instance RAC1 is running on node rac1
Instance RAC2 is running on node rac2
[oracle@rac1 ~]$ srvctl stop instance -d rac -i RAC2 -o abort
[oracle@rac1 ~]$ srvctl status database -d rac
Instance RAC1 is running on node rac1
Instance RAC2 is not running on node rac2
再次运行上面的SQL,如果如下:
SQL> /
INSTANCE_NAME HOST_NAME FAILOVER_TYPE FAILOVER_METHOD FAILED_OVER
------------- ---------------- ------------- --------------- -----------
RAC1 rac1.localdomain
SELECT BASIC YES 上面的结果说明了进行了TAF,当前连接实例为RAC1
通过DBMS_SERVICE包配置TAF
SQL> select name from v$active_services;
NAME
--------------------------------------------------------------------------------
RAC.WORLD
SYS$BACKGROUND
SYS$USERS
SQL> begin
2 dbms_service.modify_service
3 (
4 service_name=>'RAC.WORLD',
5 failover_type=>dbms_service.failover_type_select,
6 failover_method=>dbms_service.failover_method_basic,
7 failover_retries=>10,
8 failover_delay=>5
9 );
10 end;
11 /
重起数据库即可.我在周六做时没有重起,通过发v$session实图看到不能切换,找了一个多小时没有找到问题所在,重起数据库后下班,周一上班时发现可以了