In a Nutshell
Clustering is great solution to scale up and speed up the database workload processing with extreme availability. Because the storage is shared among the nodes, all the members of cluster node can concurrently access the storage, which helps the system be available during node failures. Oracle databases implement the shared everything architecture to achieve on-demand scalability and ultimate availability.
Infinite scalability on demand and uninterrupted availability can be achieved by the right clustering technology. Oracle databases have a good history on clusters with the OPS and its successor, Oracle RAC. The previous limitations of OPS are addressed in the current versions of RAC, with the introduction of the Cache Fusion framework. ...
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