Relational Database Management System (RDBMS) Question:

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

RDBMS Interview Question
RDBMS Interview Question

Answer:

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 performance at least comparable to that of existing system.

Its two subsystems are

► Research Storage
► System Relational Data System.


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What is extension and intension?How is the data structure of System R different from the relational structure?