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SQL Server® 2008 Administration: Real World Skills for MCITP Certification and Beyond by Tom Carpenter

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Using Database Mirroring

Unlike RAID mirroring, which is a drive-level concept, database mirroring is a transaction-level concept within a SQL Server architecture. Database mirroring provides a mechanism for duplicating databases across servers and is a low-latency solution. With this technology, you can create a warm standby server using just two servers or a hot standby server using a third server. A warm standby server is one that can be brought online with some effort in a manual fashion. A hot standby server is one that is enabled automatically when the primary server fails. You create the warm standby server with a production server, where the user interactions occur, and another server that is receiving the transactions but is not available ...

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