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Witness server - what exactly happens on the instance?

  • January 27, 2011 at 3:10 pm

    #234203

    I had an interesting question pop up today. When a SQL 2008 (in this case) instance is configured as a witness server, what exactly is modified on the instance and what changes as far as processes, etc. running are modified on that instance, aside from listening on the endpoint?

    In more basic terms, what exactly happens on a witness instance that allows it to perform its witness function?

    Thanks,

    Jason

  • January 28, 2011 at 3:56 pm

    #1280002

    Almost nothing, which is why the Express edition can perform this task. It's only there to form a quorum, so it's role is really to tell server A whether it can see server B, and tell B whether it can see A.

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