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Microsoft® SQL Server 2012 Unleashed by Alex T. Silverstein, Chris Gallelli, Paul T. Bertucci, Ray Rankins

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Roles of the Database Mirroring Configuration

As you have seen, a typical database mirroring configuration has a principal server, mirror server, and witness server. Each of these servers plays a role at some point. The principal and mirror switch roles, so it is important to understand what these roles are and when a server is playing a particular role.

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