CHAPTER 40Oracle Real Application Clusters
In an Oracle Real Application Clusters (RAC) environment, multiple instances access a single database. The instances are commonly created on separate servers that are connected via a high-speed interconnect with access to a shared disk area. The database files reside on a shared set of disks, and each instance has its own control files and online redo log files that are also stored on the shared disks.
A user can be directed to connect to the database through one of the instances attached to it; if an instance goes down, the connection may be dynamically reconnected to the database via another instance in the cluster. RAC thus provides a high-availability solution (accounting for server and instance ...
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