收藏的学习数据库的入门资料 SQL Server 2008 R2数据库镜像部署

“数据库镜像”是一种针对数据库高可用性的基于软件的解决方案。其维护着一个数据库的两个相同的副本，这两个副本分别放置在不同的SQL Server数据库实例中。建议使用不同位置的两台服务器来承载。在同一时刻，其中一台上的数据库用于客户端访问，充当“主体服务器”角色；而另一台则根 据镜像会话的配置和状态，充当热备份服务器，即“镜像服务器角色”，这两种角色不是绝对的。

-Collection of learning introductory information on the database SQL Server 2008 R2 Database Mirroring Deployment " database mirroring"　is a high availability for database software-based solutions. It maintains a database of two identical copies, two copies were placed in a different SQL Server database instance. Recommend the use of two servers in different locations to carry. At the same time, one stage of the database used for client access, acting as " principal server"　role　while another is based on the configuration and state of the mirroring session, to act as hot backup server, or " mirror server role" , the two kind of role is not absolute.