• Database mirroring doesn't impact performance (implemented correctly).

    As for whatever questions were deleted, those look like homework or test questions. How about trying them yourself, you don't learn anything if you're just given the answers.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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