Description: RAC (Real Application Clusters) is a database clustering solution developed by Oracle that allows multiple database instances to access a single physical database. This architecture provides high availability, scalability, and performance, enabling multiple Oracle Database instances to work together to manage workloads. RAC uses a shared storage system, where cluster nodes can access the same data, facilitating load distribution and redundancy. Its main features include fault recovery capability, the ability to perform maintenance without downtime, and resource optimization. RAC is especially relevant in enterprise environments where service continuity and performance are critical, as it allows applications to continue running even if one of the nodes fails. Additionally, its design allows for the addition of new nodes to the cluster without interrupting service, making it a flexible option for growing businesses.
History: RAC was introduced by Oracle in 2001 as part of its 9i version of Oracle Database. Since then, it has evolved through several versions, enhancing its performance and capabilities. In 2005, with the arrival of Oracle Database 10g, new features were incorporated that optimized resource management and disaster recovery. Over the years, RAC has been adopted by numerous companies to ensure continuous availability of their critical applications.
Uses: RAC is primarily used in enterprise environments where high availability and performance are essential. It is common in critical applications such as enterprise resource planning systems, e-commerce platforms, and real-time analytics databases. Additionally, it enables database consolidation, facilitating the management and maintenance of multiple applications in a single environment.
Examples: An example of RAC usage is in a large telecommunications company that needs to ensure continuous availability of its billing system. By implementing RAC, the company can handle load spikes and perform maintenance without interrupting service to its customers. Another case is that of a financial institution using RAC for its transaction management system, ensuring that operations are processed efficiently and without failures.
