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The document discusses database mirroring in SQL Server 2008. It provides an overview of database mirroring, including key terms like principal server, mirror server, and witness server. It describes the different mirroring modes and how failover works. It also discusses performance improvements in SQL Server 2008 database mirroring, such as compression and asynchronous log shipping. Benchmarks are presented comparing performance in 2005 versus 2008.


































































