By keeping an up-to-date standby database at
a remote location, database mirroring can protect against a wide variety of possible
disasters, from hardware issues to an actual tornado. Better yet, it can provide
a consistent user experience by immediately redirecting clients to the standby
database.
Chapter 9 briefly discusses database snapshots. An often-overlooked aspect of disaster
recovery is user error, which is unpredictable and potentially devastating. You
can use database snapshots as a mechanism to recover from a user error or potentially
retrieve altered or deleted data.
Chapter 10 combines a technical discussion of some of the hardware implications
you may face with practical approaches you can use to work through those hardware
issues. Although this chapter is in no way intended to make you an expert at hardware,
it should at least make you conversant enough to discuss potential problems
with those who are experts.
nINTRODUCTION xxiii
Chapter 11 discusses how to approach disaster recovery planning. This completely
nontechnical chapter discusses how to combine backup/recovery planning with
disaster mitigation techniques to prepare a thorough disaster recovery plan.
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