Question: Consider the refinement to the external sort algorithm that produces runs of length 2B on average, where B is the number of buffer pages. This

Consider the refinement to the external sort algorithm that produces runs of length 2B on average, where B is the number of buffer pages. This refinement was described in Section 11.2.1 under the assumption that all records are the same size. Explain why this assumption is required and extend the idea to cover the case of variable-length records.

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