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instance and crash recovery

604693Dec 29 2007 — edited Dec 29 2007

From docs,
Crash recovery is used to recover from a failure either when a single-instance database crashes or all instances of an Oracle Real Application Clusters database crashes. Instance recovery refers to the case where a surviving instance recovers a failed instance in an Oracle Real Application Clusters database.

I don't understand the difference between instance and crash recovery.
When all instances are crashed in RAC, how instance recovey is done as there is no surviving instance?

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Added on Dec 29 2007

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