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Oracle Core: Essential Internals for DBAs and Developers by Jonathan Lewis

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Recovery

The first thing to do when discussing recovery and RAC is to dismiss media recovery—it’s not really any different from media recovery for single-instance Oracle. You take a backup copy of the database and a list of (archived) redo log files and work through them applying the redo log entries that need to be applied; and since Oracle does a two-phase recovery (working out which blocks need recovering from which redo byte address) it doesn’t really make much difference that the recovery process has to keep log files from multiple instances in synch as it reads and applies them.

There are, inevitably, a couple of interesting little details. For example, the need to (logically) merge all the log files means that when you set up a physical ...

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