• yes and yes and it 'll be ok.

    mirroring works with log replication, so everything you do on your principal db will also be performed on your mirror db as long as you don't break mirroring.

    Depending on the type of mirroring you configured, you may lose some data at the mirror db because of async settings.

    ref http://msdn.microsoft.com/en-us/library/ms189852.aspx

    Johan

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