Another advantage is that this solution can handle cascading failures of application servers, which is only possible with more than one replica in a memory to memory configuration.
此解决方案的另一个优势是能够处理应用服务器的级联故障，而这在内存到内存配置中只有使用多个副本才有可能实现。
If you cluster more than two servers, you should maintain only one replica copy of a database (as long as this can meet your availability needs).
如果集群的服务器超过两个，您应该仅维护数据库的一个副本(只要能够满足可用性需求)。
If you need to run reports against your data, then you very likely have a read-only replica database to reduce the load on your master production database.
如果您需要运行数据报告，那么您很可能会用一个只读复制数据库来减少主生产数据库的负载。
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