mirroring (n)~ Immediately reproducing every update to a read-write da…
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mirroring (n)~ Immediately reproducing every update to a read-write database (the principal database) onto a read-only mirror of that database (the mirror database) residing on a separate instance of the database engine (the mirror server). In production environments the mirror server is on another machine. The mirror database is created by restoring a full backup of the principal database (without recovery).