引用:
Grid computing can dramatically lower the cost fo computing,extend the availability of computing resources, and deliver heigher productivity and quality.
The basic idea of grid computing is the notion of computing as a utility, analogous to the electric power grid or the telephone network.As a client of the grid, you do not care where your data is or where your computation is done. you want to have your computation done and to have your information delivered to you when you want it. From the server side, grid is about virtualization and provisioning. you pool all your resources together and provision these resources dynamically based on the needs of your business, thus achieving better resource utilization at the same time.
摘自: Fort hays state university (Hays, kansas, American)
Introduction to Web-enabled Databases: oracle 10g sql fundamentals
从定义上来看,这里似乎并没有给出什么明确的答案.但是我们能够看到的是,所谓的grid并不是一个真正存在的实体.它似乎更象是一种理念。它想最终达到的目的是：你不用管你做一件事的过程，而只需要知道你这么做最后就是这么一个结果。有点类似于电话交换网络，比如你在电话里听到了大洋彼岸朋友的声音，这才是你在乎的。你跟本不需要知道你朋友的声音是如何通过光缆或者卫星甚至通过那条线路才到达你得电话听筒的。
如果要究其根源是什么，或者说是由那些组件和应用程序最终组成了所谓的grid？
我想答案应该是：Grid由多个组件混合而成，包括RAC，SAM等等。
引用：
The three grid-infrastucture products of the oracle 10g release are:
oracle databases 10g
oracle Application server 10g
oracle Enterprise Manager 10g Grid Control
我想这也是oracle10g一个新的卖点吧。
（以上纯属个人理解，欢迎大家参与讨论并指正）
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