现在数据库已经成功配置成了rac形式，想实现oc4j到database的负载均衡和高可用性，即平时应用根据情况自动选择连接到一个instance，如果某个instance挂了，以后应用就连到好的那台。但是小弟不知道如何配置，请知道的大哥帮帮忙。

参考一下这个
<data-source class="com.evermind.sql.DriverManagerDataSource" name="TxLife" location="jdbc/OracleCoreDS"
xa-location="jdbc/xa/OracleXADS" ejb-location="TxLife" connection-driver="oracle.jdbc.driver.OracleDriver" username="pi
ccprod" password="picc_prod_03"  url="jdbcracle:thin:@(DESCRIPTION =(ADDRESS_LIST=(LOAD_BALANCE = off)(FAILOVER=on) (A
DDRESS = (PROTOCOL = TCP)(HOST = 10.64.1.31)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 10.64.1.33)(PORT = 1521)))
(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = life) ))" inactivity-timeout="30" min-connections="40" max-connectio
ns="80"/>