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The choice of partial inversions and combined indices

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Abstract

It is often undesirable or impossible to provide redundant indices for all domains of a file existing on a secondary storage device. The problem considered in this paper is the selection of a limited number of indices which best facilitate interaction with a file. A probabilistic model of interaction activity encompassing queries and updates is presented, and a parametric description of the storage medium is assumed. Significant results which are independent of many file and storage characteristics are found concerning the best choice of indices in two cases. The first is the choice of domains to include in a partial inversion. Here it is desired to find the best possible subset of domains for which to provide indices. The second case concerns the choice of combined indices. In this situation the best way of grouping domains is sought in order to provide one index for each group.

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Research sponsored in part by the General Foods Corporation, New York, New York.

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Stonebraker, M. The choice of partial inversions and combined indices. International Journal of Computer and Information Sciences 3, 167–188 (1974). https://doi.org/10.1007/BF00976642

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  • DOI: https://doi.org/10.1007/BF00976642

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