Oracle Real Application Clusters Oracle Real Application Clusters (RAC) is an option to the award-winning Oracle Database Enterprise Edition. Oracle RAC is a cluster database with a shared cache architecture that overcomes the limitations of traditional shared-nothing and shared-disk approaches to provide highly scalable and available database solutions for all your business applications.
Oracle RAC is a key component of Oracle enterprise grid architecture. Oracle Database Standard Edition includes Real Application Clusters support for higher levels of system uptime.
Oracle RAC One Node is a new option with Oracle Database 11g Release 2 is a single instance of Oracle RAC running on one node in a cluster. This option adds to the flexibility that Oracle offers for database consolidation while reducing management overhead by providing a standard deployment for Oracle Databases in the enterprise.
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