Hashing and trie algorithms for partial match retrieval

  • Authors:
  • W. A. Burkhard

  • Affiliations:
  • Univ. of California, San Diego, La Jolla

  • Venue:
  • ACM Transactions on Database Systems (TODS)
  • Year:
  • 1976

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Abstract

File designs suitable for retrieval from a file of k-letter words when queries may be only partially specified are examined. A new class of partial match file designs (called PMF designs) based upon hash coding and trie search algorithms which provide good worst-case performance is introduced. Upper bounds on the worst-case performance of these designs are given along with examples of files achieving the bound. Other instances of PMF designs are known to have better worst-case performances. The implementation of the file designs with associated retrieval algorithms is considered. The amount of storage required is essentially that required of the records themselves.