Real Application Clustersand Performance
Oracle9i introduced an enhancement to the Oracle Parallel Server (OPS) technology called Real Application Clusters. In the past, OPS had been primarily used for availability, since there were performance penalties for using OPS with OLTP and some other types of applications.
Real Application Clusters have eliminated these problems, making it possible for most applications to scale over a cluster of machines. Oracle claims that with Real Application Clusters, each new machine can add as much as 90% of the performance of the standalone machine. Even if this new technology doesn’t reach these heights, you can still easily deploy the same application on a Real Application Cluster that you can on a single database server. Doing so gives you another path to increasing the overall performance of your Oracle database.
Real Application Clusters are discussed in more detail in Chapter 8.
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