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In a _________ the system makes repeated requests for tuples from the operation at the top of the pipeline.

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In a _________ the system makes repeated requests for tuples from the operation at the top of the pipeline. (a) Demand-driven pipeline (b) Producer-driven pipeline (c) Demand pipeline (d) All of the mentioned The question was asked in exam. This is a very interesting question from Evaluation of Expressions topic in section Query Processing Techniques of Database Management

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Right option is (a) Demand-driven pipeline Explanation: Each time that an operation receives a request for tuples, it computes the next tuple (or tuples) to be returned, and then returns that tuple.

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