Oracle RAC 服务器端连接负载均衡(Load Balance)
Oracle RAC服务器端的负载均衡是根据RAC中各节点的连接负荷数情况，将新的连接请求分配到负荷最小的节点上去。当数据库处于运行时
Oracle RAC服务器端的负载均衡是根据RAC中各节点的连接负荷数情况，将新的连接请求分配到负荷最小的节点上去。当数据库处于运行时，RAC中各节点的PMON进程每3秒会将各自节点的连接负荷数更新到service_register。而对于节点中任意监听器故障或监听器意外失败时，PMON进程会每1秒钟检查当前节点上的监听是否重启，以获得最新的负载信息来及时调整负载均衡。本文主要演示SUSE 10 + oracle 10g rac下的服务器端的负载均衡。
有关客户端的负载均衡可参考
Oracle RAC 客户端连接负载均衡(Load Balance)
配置RAC负载均衡与故障转移
有关Oracle 网络配置相关基础以及概念性的问题请参考：
ORACLE RAC 下非缺省端口监听配置(listener.ora tnsnames.ora)
一、服务器端负载均衡配置
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