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New order preserving access methods for very large files derived from linear hashing

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2 Author(s)
N. I. Hachem ; Dept. of Comput. Sci., Worcester Polytech. Inst., MA, USA ; P. B. Berra

A class of order-preserving dynamic hashing structures is introduced and analyzed. The access method is referred to as the dynamic random-sequential access method (DRSAM) and is derived from linear hashing. A new logical to physical mapping that is based on sequential bucket allocations in hash order is proposed. With respect to previous methods, this allocation technique has the following characteristics: (1) the structure captures the hashed order in consecutive storage areas so that order preserving (OPH) schemes should result in performance improvements for range queries and sequential processing; and (2) it adapts elastic buckets for the control of file growth. Under specific conditions, this approach outperforms the partial expansion method previously proposed by P.-A. Larson (1982)

Published in:

IEEE Transactions on Knowledge and Data Engineering  (Volume:4 ,  Issue: 1 )