oracle11g在没DNS情况下failover的配置方法

1.Oracle 11g引入scan ip ,可在没有DNS的情况下，客户端连接RAC配置failover时，很多情况还是使用oracle10g方式。即在客户端tnsname.ora中配置failover：

1)当客户端配置如下时，连接的实例关闭后，会话必须重新连才可连接到其他活动的实例上，不会自动重连：

ora112 = 

(DESCRIPTION =

(ADDRESS_LIST =

(LOAD_BALANCE = yes)

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.113)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.114)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = ora112)

(FAILOVER = on)

)

)

或

ora112 = 

(DESCRIPTION =

(ADDRESS_LIST =

(LOAD_BALANCE = yes)

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.113)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.114)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = ora112)

(FAILOVER = on)

(TYPE = select)

(METHOD = basic)

(RETRIES = 180)

(DELAY = 5)

)

)

或（115为scan-ip）

ORA112 =

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.115)(PORT = 1521))

      (LOAD_BALANCE = yes)

    )

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = ora112)

      (FAILOVER = on)

    )

  )

或

ORA112 =

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.115)(PORT = 1521))

      (LOAD_BALANCE = yes)

    )

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = ora112)

      (FAILOVER = on)

      (failover_mode=(TYPE=SELECT)

      (METHOD=BASIC)

      (RETRIES=1)

      (DELAY=0)

    )

    )

  )

或

ORA112 =

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.115)(PORT = 1521))

      (LOAD_BALANCE = yes)

    )

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = ora112)

    )

  )

2）当客户端配置如下时，连接的实例关闭后，会话会自动连接到其他活动的实例上：

ora112 = 

(DESCRIPTION =

(ADDRESS_LIST =

(LOAD_BALANCE = yes)

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.113)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.114)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = ora112)

(FAILOVER = on)

FAILOVER_MODE=(TYPE = select)

(METHOD = basic)

(RETRIES = 180)

(DELAY = 5)

)

)

)

2.如果不采用oracle10g的方法，能不能只在客户端配置scan ip,而在服务器端配置以实现failover，具体如下：

（How To Configure Server Side Transparent Application Failover [ID 460982.1]）

1)创建TAFService

[oracle@db1 bin]$ ./srvctl add service -d ora112 -s ora112_rac -r "ora1121,ora1122" -P BASIC

--这里的ora112是database name，ora1121和ora1122 是instance name。

2)启动s_test服务

[oracle@db1 bin]$ ./srvctl start service -d ora112 -s s_test

3)检查service运行情况

[oracle@db1 bin]$ ./srvctl config service -d ora112

Service name: s_test

Service is enabled

Server pool: ora112_s_test

Cardinality: 2

Disconnect: false

Service role: PRIMARY

Management policy: AUTOMATIC

DTP transaction: false

AQ HA notifications: false

Failover type: NONE

Failover method: NONE

TAF failover retries: 0

TAF failover delay: 0

Connection Load Balancing Goal: LONG

Runtime Load Balancing Goal: NONE

TAF policy specification: BASIC

Edition: 

Preferred instances: ora1121,ora1122

Available instances:

4)确认serviceID

SQL> select name,service_id from dba_services where name = 's_test';

NAME SERVICE_ID

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

s_test 3

5)为service添加参数

SQL> execute dbms_service.modify_service (service_name => 's_test' - 

, aq_ha_notifications => true - 

, failover_method => dbms_service.failover_method_basic - 

, failover_type => dbms_service.failover_type_select - 

, failover_retries => 180 - 

, failover_delay => 5 - 

, clb_goal => dbms_service.clb_goal_long); 

6)确认参数添加情况

col name format a15 

col failover_method format a11 heading 'METHOD' 

col failover_type format a10 heading 'TYPE' 

col failover_retries format 9999999 heading 'RETRIES' 

col goal format a10 

col clb_goal format a8 

col AQ_HA_NOTIFICATIONS format a5 heading 'AQNOT' 

SQL> select name, failover_method,failover_type, failover_retries,goal, clb_goal,aq_ha_notifications from dba_services where service_id = 3; 

NAME METHOD TYPE RETRIES GOAL CLB_GOAL AQNOT

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

s_test BASIC SELECT 180 NONE LONG YES

SQL>

7)检查service注册情况

[oracle@db1 bin]$ lsnrctl services

LSNRCTL for Linux: Version 11.2.0.3.0 -Production on 15-JUL-2012 13:26:43

Copyright (c) 1991, 2011, Oracle. All rights reserved.

Connecting to(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=db1)(PORT=1521)))

Services Summary...

Service "+ASM" has 1 instance(s).

Instance "+ASM1", status READY, has 1 handler(s) for thisservice...

Handler(s):

"DEDICATED" established:57 refused:0 state:ready

LOCAL SERVER

Service "ora112" has 1 instance(s).

Instance "ora1121", status READY, has 1 handler(s) for thisservice...

Handler(s):

"DEDICATED" established:11 refused:0 state:ready

LOCAL SERVER

Service "ora112XDB" has 1instance(s).

Instance "ora1121", status READY, has 1 handler(s) for thisservice...

Handler(s):

"D000" established:0 refused:0 current:0 max:1022 state:ready

DISPATCHER

(ADDRESS=(PROTOCOL=tcp)(HOST=db1.tianlesoftware.com)(PORT=38731))

Service "s_test" has 1instance(s).

Instance "ora1121", status READY, has 1 handler(s) for thisservice...

Handler(s):

"DEDICATED" established:11 refused:0 state:ready

LOCAL SERVER

The command completed successfully

8)配置tnsnames.ora，连接后，关闭连接实例后，会话会自动切换到其他活动实例上（115为scan ip）：

ORA112 =

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.87.115)(PORT = 1521))

      (LOAD_BALANCE = yes)

    )

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = s_test)

    )

  )