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OCA Oracle Database 11g: Database Administration I: A Real-World Certification Guide by Steve Ries

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Exploring Oracle Real Application Clusters

Now that we've fully explored the Oracle database architecture, a question might be raised. "Why make a distinction between the instance and the database at all? Don't they both operate on the same system?" By way of answer, yes; a vast majority of Oracle systems run on a single server. The background processes use a single set of CPUs and the caches run within a single set of memory chips. The database files exist on either storage that is within the machine or connected to it. Both the instance and database run on a single system. However, the Oracle RDBMS can be run in a different architecture—one in which the instance and database are physically independent.

Let's imagine an example for a moment. Let's ...

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