它由一对服务器组成—主服务器和HDR备用服务器—并且同时支持异步和同步复制模式。
It consists of a pair of servers - the primary and the HDR secondary - and supports both synchronous and asynchronous replication modes.
在同步模式下，只有接收到来自hdr备用服务器的确认，主服务器才会提交事务。
In synchronous mode, transactions on the primary server will not commit until it receives an acknowledgement from the HDR secondary server.
在异步模式下，只有检查点在主服务器和HDR备用服务器之间是同步的。
In asynchronous mode, only checkpoints are synchronized between the primary and HDR secondary.
持久性设为adaptive意味着如果备用服务器也在活动，那么主服务器以宽松的日志记录模式操作。
The adaptive durability setting means that the primary server operates in relaxed logging mode if the secondary server is also active.
该模式下，当日志数据存在于主服务器的磁盘上，且备用服务器已经收到了日志数据时，提交(commit)就成功了。
In this mode, a commit succeeds when the log data is on disk at the primary and it has been received by the standby server.
最后，本文对备用辅助服务的模式以及定价方式进行了研究，在通过泛读和精读大量文献的基础上，探讨了主辅市场联合定价的备用方法。
At last, this dissertation has researched the pattern and pricing method of reserve, and discuss the reserve method of joint pricing which is based on reading a lot of papers.
最后，本文对备用辅助服务的模式以及定价方式进行了研究，在通过泛读和精读大量文献的基础上，探讨了主辅市场联合定价的备用方法。
At last, this dissertation has researched the pattern and pricing method of reserve, and discuss the reserve method of joint pricing which is based on reading a lot of papers.
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