An Adaptive Hash Join Algorithm for Multiuser Environments.

Hansjörg Zeller, Jim Gray: An Adaptive Hash Join Algorithm for Multiuser Environments. VLDB 1990: 186-197

@inproceedings{DBLP:conf/vldb/ZellerG90,
  author    = {Hansj{\"o}rg Zeller and
               Jim Gray},
  editor    = {Dennis McLeod and
               Ron Sacks-Davis and
               Hans-J{\"o}rg Schek},
  title     = {An Adaptive Hash Join Algorithm for Multiuser Environments},
  booktitle = {16th International Conference on Very Large Data Bases, August
               13-16, 1990, Brisbane, Queensland, Australia, Proceedings},
  publisher = {Morgan Kaufmann},
  year      = {1990},
  isbn      = {1-55860-149-X},
  pages     = {186-197},
  ee        = {db/conf/vldb/ZellerG90.html},
  crossref  = {DBLP:conf/vldb/90},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

As main memory becomes a cheaper resource, hash joins are an alternative to the traditional methods of performing equi-joins: nested loop and merge joins. This paper introduces a modified, adaptive hash join method that is designed to work with dynamic changes in the amount of available memory. The general idea of the algorithm is to regulate resource usage of a hash joinin a way that allows it to run concurrently with other applications. The algorithm provides good performance for a broad range of problem sizes, allows to join large tables in a small main memory, and uses advanced I/O controllers with track- size I/O transfers. It has been implemented as a prototype in Nonstop SQL, a DBMS running on Tandem machines.

Copyright © 1990 by the VLDB Endowment. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its date appear, and notice is given that copying is by the permission of the Very Large Data Base Endowment. To copy otherwise, or to republish, requires a fee and/or special permission from the Endowment.

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Dennis McLeod, Ron Sacks-Davis, Hans-Jörg Schek (Eds.): 16th International Conference on Very Large Data Bases, August 13-16, 1990, Brisbane, Queensland, Australia, Proceedings. Morgan Kaufmann 1990, ISBN 1-55860-149-X

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