what is oracle rac

Oracle RAC is a cluster database technology that allows multiple computers to share the same database. Its characteristics are: 1. High availability, through multi-node deployment, even if a node fails, other nodes can still continue to provide services, ensuring continuous availability of the database; 2. Scalability, by increasing or reducing the number of nodes. Increase or reduce the processing power of the system; 3. Scalability. By adding more nodes, the capacity and processing power of the database can be expanded to support more users and larger-scale data processing, etc.

The operating environment of this tutorial: Windows 10 system, Oracle version 19c, DELL G3 computer.

Oracle RAC(Real Application Clusters) is a cluster database technology that allows multiple computers to share the same database, thereby providing high availability, scalability, and extensibility. RAC is a component of the Oracle database that runs on multiple nodes and communicates with each other through a high-speed Internet network to complete tasks collaboratively. Each node has its own computing resources and memory, but they share the same storage space.

Oracle One of the main features of RAC is its high availability. Through multi-node deployment, even if a node fails, other nodes can still continue to provide services, ensuring continuous availability of the database. When a node fails, RAC will automatically redistribute tasks and resources to ensure the smooth operation of the system and reduce the impact on users.

Scalability is another important feature. Oracle RAC can increase or decrease the processing power of the system by increasing or decreasing the number of nodes. As users or data volume increases, more nodes can be dynamically added to share the load, maintaining system performance and responsiveness. In addition, RAC also supports dynamic adjustment of resource allocation, which can intelligently allocate computing resources according to needs and improve system utilization.

Scalability is another advantage of Oracle RAC. By adding more nodes, the capacity and processing power of the database can be expanded to support more users and larger-scale data processing. This makes Oracle RAC has become an ideal choice for handling high load and large-scale business, especially in scenarios that need to handle a large number of concurrent transactions, such as e-commerce websites, financial transaction systems, etc.

Oracle RAC also provides fault recovery and data protection functions. Through multi-node deployment and data replication technology, data backup and recovery can be achieved. When a node fails, the backup node can take over the task, ensuring system continuity and data integrity. In addition, Oracle RAC also supports real-time flashback technology, which can quickly restore the database to a specific point in time to meet business needs and compliance requirements.

In short, Oracle RAC is a powerful cluster database technology that provides high availability, scalability and extensibility. Through multi-node deployment, it can ensure the continuous availability of the database and provide flexible resource management and failure recovery mechanisms. For organizations that need to handle high loads and large-scale operations, Oracle RAC is an ideal choice that can help them improve business performance and data processing capabilities, and ensure data security and integrity.

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