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Home/Magazine Archive/July 1982 (Vol. 25, No. 7)/Estimating block accesses and number of records in.../Abstract

Estimating block accesses and number of records in file management

By To-Yat Cheung
Communications of the ACM, July 1982, Vol. 25 No. 7, Pages 484-487
10.1145/358557.358581
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We consider the problems of estimating the number of secondary storage blocks and the number of distinct records accessed when a transaction consisting of possibly duplicate requested records is presented to a file management system. Our main results include (1) a new formula for block access estimation for the case where the requested records may have duplications and their ordering in immaterial and (2) a simple formula for estimating the number of distinct records in the transaction.

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