Real Application Cluster (RAC)

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Oracle RAC（Real Application Cluster）是一种允许数据库跨多台服务器安装的组件，它通过共享磁盘方法集群数据库来实现可扩展性、成本节约和高可用性。与大多数竞争对手采用的共享无事物架构不同，RAC提供了故障转移能力，显著提高了数据库的可靠性和可用性。

Real Application Cluster (RAC) is a component of the Oracle 9i database product that allows a database to be installed across multiple servers. According to Oracle, RAC's shared disk method of clustering databases: increases scalability because servers can easily be added or subtracted to meet current needs, lowers

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Real Application Clusters (RAC)

costs because companies don't have to buy high-end servers, and improves availability because if one server fails, another can assume its workload.

RAC's shared disk architecture is an unusual approach to database clustering. Most competing database products (such as Microsoft's SQL Server and IBM's DB2 for Windows and Unix environments) use the alternative, which is known as "shared nothing" architecture. Shared nothing architecture partitions data and only gives each server access to its own disk subsystem, while shared disk architecture gives all servers access to the entire database. This adds failover capacity to the database, because all servers have access to the whole database. Proponents claim that this capacity increases 9i's reliability and availability significantly. British Telecom, for example, reported that deploying the product enabled them to cut their failover time from a typical 20 minutes to between 10-60 seconds.

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