Kellyn Gorman gives us a primer:
Oracle Real Application Clusters (RAC) is still one of the most robust instance high-availability and scalability solutions, designed to provide resilience, performance, and continuous service for many Oracle enterprise workloads. Whether deployed on two nodes or a complex multi-node setup, RAC ensures your database infrastructure is both fault-tolerant and responsive under increasing demand. RAC is an essential part of the Maximum Availability Architecture (MAA) recommended practices, (and in my experience) found in about 40% of small to medium Oracle environments, 98% of large enterprise environments and 100% of Exadata engineered systems.
In this post, we’ll walk through the architectural foundation of RAC, configuration essentials, and a real-world transactional scenario that highlights the importance of its shared and synchronized architecture.
Read on to learn more.