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Creating Highly Available Database Solutions: Oracle Real Application Clusters (RAC) and Sun Cluster 3.x Software by Michael Loebmann, Kristien Hens

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Appendix A. History of Oracle’s Parallel Database Technology

A cluster consists of independent computer nodes, each with its own operating system. Therefore, architectures that use clustering technology do not show node-comprehensive symmetric multiprocessing (SMP) attributes, and the operating system is not in the position to support this functionality. For this reason, an overlapping mechanism is required to transparently merge independent nodes to one system, an architecture known as a parallel database architecture.

Since 1991, when the Oracle Parallel Server (OPS) was made available for production sites, Oracle has made every effort to improve stability and performance to more closely match the capability characteristics of an SMP architecture. ...

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