Benefits From Oracle Real Application Cluster

根据Oracle官方的介绍RAC提供了高可用(high availability)和容错(fault tolerance)特性。

此外RAC也有助于提升性能，但是关于这一点有比较大的争议，很多人认为RAC无益于性能甚至有害。

应当这样说RAC对于优化过的在线事务处理(Well Tuned OLTP)和数据仓库(Data Warehouse)应用是性能有益的。同时性能的改善包含Speedup和Scaleup 2方面不能一概而论，DSI 408中给出比较中肯的评价:

Scaleup
Scaleup is the capability to provide continued increases in
throughput in the presence of limited increases in processing capability while keeping time constant:
Scaleup = (volume parallel) / (volume original)

Speedup
Speedup is the capability to provide continued increases in
speed in the presence of limited increases in processing capability, while keeping the task constant:
Speedup = (time original) / (time parallel)

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