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H-trees: A Dynamic Associative Search Index for OODB.

Chee Chin Low, Beng Chin Ooi, Hongjun Lu: H-trees: A Dynamic Associative Search Index for OODB. SIGMOD Conference 1992: 134-143
@inproceedings{DBLP:conf/sigmod/LowOL92,
  author    = {Chee Chin Low and
               Beng Chin Ooi and
               Hongjun Lu},
  editor    = {Michael Stonebraker},
  title     = {H-trees: A Dynamic Associative Search Index for OODB},
  booktitle = {Proceedings of the 1992 ACM SIGMOD International Conference on
               Management of Data, San Diego, California, June 2-5, 1992},
  publisher = {ACM Press},
  year      = {1992},
  pages     = {134-143},
  ee        = {http://doi.acm.org/10.1145/130283.130307, db/conf/sigmod/LowOL92.html},
  crossref  = {DBLP:conf/sigmod/92},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

The support of the superclass-subclass concept in object-oriented databases (OODB) makes an instance of a subclass also an instance of its superclass. As a result, the access scope of a query against a class in general includes the access scope of all its subclasses, unless specified otherwise. To support the superclass-subclass relationship efficiently, the index must achieve two objectives. First, the index must support efficient retrieval of instances from a single class. Second, it must also support efficient retrieval of instances from classes in a hierarchy of classes. In this paper, we propose a new index called the H-tree that supports efficient retrieval of instances of a single class as well as retrieval of instances of a class and its subclasses. The unique feature of H-trees is that they capture the superclass-subclass relationships. A performance analysis is conducted and both experimental and analytical results indicate that the H-tree is an efficient indexing structure for 00DB.

Copyright © 1992 by the ACM, Inc., used by permission. Permission to make digital or hard copies is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice on the first page or initial screen of a display along with the full citation.


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Michael Stonebraker (Ed.): Proceedings of the 1992 ACM SIGMOD International Conference on Management of Data, San Diego, California, June 2-5, 1992. ACM Press 1992 CiteSeerX Google scholar pubzone.org BibTeX bibliographical record in XML, SIGMOD Record 21(2), June 1992
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