By James K. Mullin
Communications of the ACM,
December 1971,
Vol. 14 No. 12, Pages 775-776
10.1145/362919.362933
Comments
In a paper in the November 1970 Communications of the ACM, V.Y. Lum introduced a technique of file indexing named combined indices. This technique permitted decreased retrieval time at the cost of increased storage space. This paper examines combined indices under conditions of file usage with different fractions of retrieval and update. Tradeoff curves are developed to show minimal cost of file usage by grouping various partially combined indices.
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