第三台计算机包含集群数据库。
对于每个集群数据库副本，与写磁盘操作相关的网络流量会加倍。
For each cluster database replica, network traffic associated with write disk operations is approximately doubled.
转换数据库厂商或设法集群数据库服务器将意味着完全改变您的前端代码。
Switching database vendors or trying to cluster the database servers would mean changing all your front end code.
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