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2024-01-04
小编给大家分享一下oracle 10g,11g RAC中vip有什么用,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
Why do we have a Virtual IP (VIP) in Oracle RAC 10g or 11g? The goal isapplication availability. RAC 中VIP的目的是实现app应用的高可用When a node fails, the VIP associated with it isautomaticallyfailed over to some other node. 当rac系统中其中一个节点down掉时,被分配的vip会自动的故障转移到健康的节点 Whenthis occurs, thefollowing things happen. 当发生failover时,会有以下动作发生 (1) VIP detects publicnetworkfailure which generates a FAN(Fast Application Notification, FAN is an event generated bythe EVM) event. VIP检测网络故障产生的扇出事件 FAN事件(Fast Application Notification,FAN is an event generated by the EVM) (2) the new node re-arps the world indicating a new MAC address forthe IP. 在新的节点重新解析,表明一个新的MAC地址的IP (3) connected clients subscribing toFAN immediately receive ORA-3113 error or equivalent. Those not subscribing to FAN will eventually timeout. 已连接的客户端通过订制的FAN事件将迅速收到ORA3113错误,未开启FAN事件的客户端最终将超时 (4) New connection requests rapidly traverse the tnsnames.ora address list skipping overthe dead nodes, insteadof having to wait on TCP-IP timeouts 新的连接迅速请求通过tnsnames.ora文件的地址列表跳过无效的节点,而不是等待TCP-IP超时 Without using VIPs or FAN, clients connected to a node that died will often wait for a TCP timeout period(which can be upto 10 min) before getting an error. 如果未用vip或者FAN,连接到宕机节点的客户端在报错之前经常会等待TCP超时以上是“oracle 10g,11g RAC中vip有什么用”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注行业资讯频道!
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