This technology allows an Oracle database to run across multiple servers simultaneously, enhancing performance and availability.

Here’s the concept of Oracle RAC:

1. High Availability: Oracle RAC ensures that the database remains available even if one of the servers fails. If one server goes down, other systems in the cluster can take over without interrupting the service.
2. Scalability: The system can easily scale by adding more servers to the cluster, which enhances performance and allows for handling a larger volume of data and requests.
3. Load Balancing: Oracle RAC helps distribute loads evenly among multiple servers, improving performance and reducing bottlenecks.
4. Redundancy: The system provides data redundancy across different servers, maintaining data integrity and increasing system security.
5. Management: Managing an Oracle RAC system can be more complex compared to managing a single-server database, but Oracle provides advanced management tools to simplify this process.

In simple terms, Oracle RAC helps improve database performance and ensures continuous availability by distributing loads across multiple servers while providing redundancy and balance in data handling.