持续可用性要求数据库引擎随时可用，没有可觉察的停机时间。
Continuous availability demands that the database engine be available for processing with no perceivable downtime.
它能在高可用性集群的服务器停机时维护用户连接。
It can service the user connections while the servers of the high availability cluster are brought down.
高可用性——有了复制与容错的托管配置，宕机时间可以最小化。
High Availability - Downtime can be minimized with replication and fault tolerant hosted configurations.
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