About Cluster Node Selection for Database Installation
Select the cluster nodes to install Oracle RAC or Oracle RAC One Node databases.
You can use cluster nodes to host Oracle RAC database instances that run in read-only mode, which become Oracle RAC Reader Nodes. Oracle RAC Reader Nodes facilitate Oracle Flex Cluster architecture by allocating a set of read/write instances running Online Transaction Processing (OLTP) workloads and a set of read-only database instances across cluster nodes.
Parent topic: Selecting Installation Options for Oracle RAC