The hcC-tree: An Efficient Index Structure for Object Oriented Databases.

B. Sreenath, S. Seshadri: The hcC-tree: An Efficient Index Structure for Object Oriented Databases. VLDB 1994: 203-213
  author    = {B. Sreenath and
               S. Seshadri},
  editor    = {Jorge B. Bocca and
               Matthias Jarke and
               Carlo Zaniolo},
  title     = {The hcC-tree: An Efficient Index Structure for Object Oriented
  booktitle = {VLDB'94, Proceedings of 20th International Conference on Very
               Large Data Bases, September 12-15, 1994, Santiago de Chile, Chile},
  publisher = {Morgan Kaufmann},
  year      = {1994},
  isbn      = {1-55860-153-8},
  pages     = {203-213},
  ee        = {db/conf/vldb/vldb94-203.html},
  crossref  = {DBLP:conf/vldb/94},
  bibsource = {DBLP,}


Object oriented database systems, in contrast to traditional relational database systems, allow the scope of a query against a class to be either the class itself or all classes in the class hierarchy rooted at the class. If object oriented databases have to achieve acceptable performance levels against such queries, we need indexes that support efficient retrieval of instances from a single class as well as from all the classes in a class hierarchy. In this paper, we propose a new index structure called hcC-tree (hierarchy class Chain tree) that supports both kinds of retrieval efficiently. Moreover, the update cost of the index structure is bounded by the height of the hcC-tree (which is usually never more than four). We have implemented hcC-trees along with H-trees and CH-trees (two other index structures that have been proposed in the literature) and report a detailed performance analysis of the three structures. The performance study reveals that hcC-trees perform much better than the other two structures under most circumstances. The balanced behaviour of hcC-tree under all kinds of queries and in the presence of updates shows that it is a promising index structure for the future.

Copyright © 1994 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.

Online Paper

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Printed Edition

Jorge B. Bocca, Matthias Jarke, Carlo Zaniolo (Eds.): VLDB'94, Proceedings of 20th International Conference on Very Large Data Bases, September 12-15, 1994, Santiago de Chile, Chile. Morgan Kaufmann 1994, ISBN 1-55860-153-8
Contents BibTeX


Elisa Bertino, Won Kim: Indexing Techniques for Queries on Nested Objects. IEEE Trans. Knowl. Data Eng. 1(2): 196-214(1989) BibTeX
Douglas Comer: The Ubiquitous B-Tree. ACM Comput. Surv. 11(2): 121-137(1979) BibTeX
Yoshiharu Ishikawa, Hiroyuki Kitagawa, Nobuo Ohbo: Evaluation of Signature Files as Set Access Facilities in OODBs. SIGMOD Conference 1993: 247-256 BibTeX
Alfons Kemper, Guido Moerkotte: Access Support in Object Bases. SIGMOD Conference 1990: 364-374 BibTeX
Chee Chin Low, Hongjun Lu, Beng Chin Ooi, Jiawei Han: Efficient Access Methods in Deductive and Object-Oriented Databases. DOOD 1991: 68-84 BibTeX
Chee Chin Low, Beng Chin Ooi, Hongjun Lu: H-trees: A Dynamic Associative Search Index for OODB. SIGMOD Conference 1992: 134-143 BibTeX

Referenced by

  1. Thomas A. Mück, Martin L. Polaschek: A Configrable Type Hierarchy Index for OODB. VLDB J. 6(4): 312-332(1997)
  2. Elisa Bertino, Paola Foscoli: On Modeling Cost Functions for Object-Oriented Databases. IEEE Trans. Knowl. Data Eng. 9(3): 500-508(1997)
  3. Thomas A. Mück, Martin L. Polaschek: The Multikey Type Index for Persistent Object Sets. ICDE 1997: 22-31
  4. Chee Yong Chan, Cheng Hian Goh, Beng Chin Ooi: Indexing OODB Instances based on Access Proximity. ICDE 1997: 14-21
  5. Thomas A. Mück, Martin L. Polaschek: Optimal Type Hierarchy Linearization for Queries in OODB. DASFAA 1997: 225-234
  6. Beng Chin Ooi, Jiawei Han, Hongjun Lu, Kian-Lee Tan: Index Nesting - An Efficient Approach to Indexing in Object-Oriented Databases. VLDB J. 5(3): 215-228(1996)
  7. Sridhar Ramaswamy, Paris C. Kanellakis: OODB Indexing by Class-Division. SIGMOD Conference 1995: 139-150
  8. Georges Gardarin, Fernando Machuca, Philippe Pucheral: OFL: A Functional Execution Model for Object Query Languages. SIGMOD Conference 1995: 59-70
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