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What is System R? What are its two major subsystems?


System R was designed and developed over a period of 1974-79 at IBM San Jose Research Center. It is a prototype and its purpose was to demonstrate that it is possible to build a Relational System that can be used in a real life environment to solve real life problems, with the performance at least comparable to that of the existing system.
Its two subsystems are
> Research Storage
> System Relational Data System.

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