在客户机第一次连接到数据库服务器并从服务器端参数中提取信息之后，备用服务器信息被缓存在客户机上。
The alternate server information is cached at the client after first connecting to the database server and pulling the information from the server side parameter.
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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