在主要实例启动并运行时，可以使用一个不同级别的AIX软件更新升级备用实例。

You can update the alternate instance with a different level of AIX software updates while the primary instance is up and running.

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如果服务器出现故障，客户机api软件将把缓存读写操作重新路由到正常运行的备用服务器上。

If servers fail, the client API software reroutes your cache reads and writes to a working alternate.

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如果高可用性集群中某一个服务器出故障，那么集群软件就会将工作负载转移到idle备用数据库服务器。

If one of the servers in the high availability cluster fails, then the clustering software transfers the workload to the idle standby database server.

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