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Oracle Database 12c The Complete Reference by Bob Bryla, Kevin Loney

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CHAPTER50The Hitchhiker’s Guide to Oracle 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.

Every instance shares the same datafiles and the same control file. Online redo log files are assigned to a specific instance using the THREAD parameter, and only that instance ...

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