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A cluster is a group of computers organized together to perform the
same set of functions. For instance, you may have a cluster running
your database software. Or you can have a cluster running your
corporate e-mail server software.
A grid is a collection of resources. A grid can be composed of multiple
clusters. In Oracle's grid world, you can have a cluster of servers
running the database software and a cluster of servers running the
Application Server software. Since they are all in the grid, you can
move resources from one cluster to another should demands dictate.
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