CHAPTER 3RAC Architecture

Oracle Real Application Clusters allows multiple instances to access a single database. Instances running on multiple server nodes access the common set of data files comprising a single database. In a single instance environment, one Oracle database is used by only one instance running on a server machine; thus users accessing the database can connect to the database via that single server only. The processing resources (CPU memory and so on) available for the database work are limited to the single server’s processing resources. In an RAC environment, more than one instance can use the same database. This scenario presents multiple processing resources for database users.

NOTEAn instance is a set of memory structures ...

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