10g rac vip漂移的目的不是让client不加改变的连接过来
而是让client尽快收到一个连接终止的包，然后由client去连接tnsnames中配置的下一个地址。
和没有vip相比, 使用vip可以减少由于db当机而引起的client等待。
oracle rac的vip真正作用不是让应用程序进行透明切换，应用程序还是必须自己配置多个监听ip才行，否则不能切换，配置多个vip，方法如下：在dblink中也要这么配置
1.应用程序连接Oracle rac的URL写法：
1 #Oracle(AMS) 2 jdbc.driverClassName=oracle.jdbc.driver.OracleDriver 3 jdbc.url=jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.199)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.198) 4 (PORT = 1521))(LOAD_BALANCE = yes)(FAILOVER = yes)(CONNECT_DATA =(SERVICE_NAME = kobra)(FAILOVER_MODE=(TYPE = SELECT)(METHOD = BASIC)(RET 5 IRES = 180)(DELAY = 5)))) 6 jdbc.username=kms 7 jdbc.password=kms 8 9 10 #Oracle(Addon-KOBRA) 11 jdbc1.driverClassName=oracle.jdbc.driver.OracleDriver 12 jdbc1.url=jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.199)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.198 13 )(PORT = 1521))(LOAD_BALANCE = yes)(FAILOVER = yes)(CONNECT_DATA =(SERVICE_NAME = kobra)(FAILOVER_MODE=(TYPE = SELECT)(METHOD = BASIC)(RE 14 TIRES = 180)(DELAY = 5)))) 15 jdbc1.username=bond 16 jdbc1.password=bond
备注：如果使用scap ip，可以将以下代码直接替换成scan ip，形式为：jdbc:oracle:thin:@scap ip：1521：kobra
1 (DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.199)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.198) 2 (PORT = 1521))(LOAD_BALANCE = yes)(FAILOVER = yes)(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = kobra)(FAILOVER_MODE=(TYPE = SELECT)(METHOD = BASIC)(RET 3 IRES = 180)(DELAY = 15)))) 4 (DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.199)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.176.198 5 )(PORT = 1521))(LOAD_BALANCE = yes)(FAILOVER = yes)(CONNECT_DATA =(SERVICE_NAME = kobra)(FAILOVER_MODE=(TYPE = SELECT)(METHOD = BASIC)(RE 6 TIRES = 180)(DELAY = 15))))
2.客户端tnsnames.ora文件写法如下：
RACDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.1.7)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.1.8)(PORT = 1521))
(LOAD_BALANCE = yes)
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = racdb)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
)
)
)
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.1.7)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.1.8)(PORT = 1521))
(LOAD_BALANCE = yes)
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = racdb)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
)
)
)
备注：同样，可以将以下ip地址用sacn ip或域名替来替换
1 ractest = 2 (DESCRIPTION = 3 (ADDRESS = (PROTOCOL = TCP)(HOST = scan-ip.localdomain)(PORT = 1521)) 4 (LOAD_BALANCE= yes) 5 (FAILOVER= yes) 6 (CONNECT_DATA = 8 (SERVICE_NAME = kobra) 9 ) 10 )