RAC Architecture Overview
1.A cluster is a set of 2 or more machines (nodes) that share or coordinate resources to perform the same task.
2. A RAC database is 2 or more instances running on a set of clustered nodes, with all instances accessing a shared set of database files.
3.Depending on the O/S platform, a RAC database may be deployed on a cluster that uses vendor clusterware plus Oracle's own clusterware (Cluster Ready Services), or on a cluster that solely uses Oracle's own clusterware.
Thus, every RAC sits on a cluster that is running Cluster Ready Services. srvctl is the primary tool DBAs use to configure CRS for their RAC database and processes.
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