High Availability is the buzz word in today's world. The systems need to be available all the time. The applications store their data in the databases, so it becomes quite critical for the databases to be fault tolerant and always available. Oracle RAC is a popular choice when companies want to build resilience in their systems. More and more applications are becoming RAC aware and it is quite common to see companies migrating most of their applications to Oracle RAC-based database environments.
Replicating the data between Oracle RAC databases requires some additional setup. In this recipe we will look into what configuration steps are required to setup replication between Oracle RAC environments. We will not cover the set up required to make the GoldenGate replication highly available itself as there are many ways to do it and will be covered in separate recipes in Chapter 5, Oracle GoldenGate High Availability.