这次服务于一个客户，使用的HP rp4700的服务器两台，做Oracle HA。
依照常规方法，将Oracle HA部署完毕后，双击切换无故障。

由于这两台机器完全一样，因此，Standby机器的oracle并非安装，而是用rcp命令拷贝。
实际拷贝完成后，出现启动错误，此时只需要 relink oracle即可（如果不清楚那个组件，relink all是个简单的办法）。

Oracle双机切换完成后，验证在出现切换后，应用无故障。

结果，当从1号机切换到2号机，应用无法启动，报内部错误。

于是，我依次检查各软件的状态：
OS正常
Oracle正常
应用软件进程正常

可是还是没有办法运行应用系统。

分析：Oracle切换后，实际上，即Oracle从IP1机器切换到IP2机器，而对于外部应用系统而言，他们连接的是漂移的IP3。当 发生切换时，任何有状态连接将全部失效，而对无状态连接，却是没有任何影响的。

因此我们怀疑是oracle切换后，应用的中间价到数据库的连接全部失效了，应用不知道何时重新建立连接（很多应用系统，都是在系统初始化时，开辟一系列连接保持用不中断）。

我们找来应用系统的实施人员，告知他们情况。果然，当他们运行几条重新初始化应用系统中间件的命令后，系统完全正常。

经验：在Oracle HA部署过程中，一定要验证，切换后，应用系统是否能够重新正确初始化。在Oracle的HA脚本后，添加应用软件层的初始化脚本，往往能够解决一些部署后的奇怪故障。

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