The Oracle Real Application Clusters (RAC) option was first released in a blaze of publicity as part of Oracle 9.0.1 in the summer of 2001. It is considered by many within the Oracle community to be the most significant feature introduced in Oracle 9i.
Although RAC has been marketed as an entirely new feature, much of the technology was inherited from Oracle Parallel Server (OPS), which was introduced in Oracle 6.0 and developed steadily over the next decade.
This chapter contains a general introduction to the features of RAC and discusses the potential costs and benefits of deploying a RAC cluster.
A cluster consists of multiple interconnected servers that appear to end users and applications ...