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11

Data Guard

An old adage says that a DBA can get many things wrong but must never fail in one single competency: database recovery. It holds that if there is a way to restore the database to the time before the error happened, then any error is potentially reversible. This saying was coined many years ago, and the boom in overall database sizes and increased dependence of modern organizations on databases as foundational to their business operations have made it all the more true!

Over time, one additional requirement has emerged—we need fast database recovery. Restoring a multi-terabyte database from tapes is not something the business ...

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