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小編給大家分享一下oracle 10g,11g RAC中vip有什么用,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
Why do we have a Virtual IP (VIP) in Oracle RAC 10g or 11g? The goal is application availability. RAC 中VIP的目的是實(shí)現(xiàn)app應(yīng)用的高可用 When a node fails, the VIP associated with it is automatically failed over to some other node. 當(dāng)rac系統(tǒng)中其中一個(gè)節(jié)點(diǎn)down掉時(shí),被分配的vip會(huì)自動(dòng)的故障轉(zhuǎn)移到健康的節(jié)點(diǎn) When this occurs, the following things happen. 當(dāng)發(fā)生failover時(shí),會(huì)有以下動(dòng)作發(fā)生 (1) VIP detects public network failure which generates a FAN(Fast Application Notification, FAN is an event generated by the EVM) event. VIP檢測(cè)網(wǎng)絡(luò)故障產(chǎn)生的扇出事件 FAN事件(Fast Application Notification,F(xiàn)AN is an event generated by the EVM) (2) the new node re-arps the world indicating a new MAC address for the IP. 在新的節(jié)點(diǎn)重新解析,表明一個(gè)新的MAC地址的IP (3) connected clients subscribing to FAN immediately receive ORA-3113 error or equivalent. Those not subscribing to FAN will eventually time out. 已連接的客戶端通過訂制的FAN事件將迅速收到ORA3113錯(cuò)誤,未開啟FAN事件的客戶端最終將超時(shí) (4) New connection requests rapidly traverse the tnsnames.ora address list skipping over the dead nodes, instead of having to wait on TCP-IP timeouts 新的連接迅速請(qǐng)求通過tnsnames.ora文件的地址列表跳過無效的節(jié)點(diǎn),而不是等待TCP-IP超時(shí) Without using VIPs or FAN, clients connected to a node that died will often wait for a TCP timeout period (which can be up to 10 min) before getting an error. 如果未用vip或者FAN,連接到宕機(jī)節(jié)點(diǎn)的客戶端在報(bào)錯(cuò)之前經(jīng)常會(huì)等待TCP超時(shí)
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