Validating an Access Cost Model for Wide Area Applications

  • Vladimir Zadorozhny
  • Louiqa Raschid
  • Tao Zhan
  • Laura Bright
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2172)


In this paper, we describe a case study in developing an access cost model for WebSources in the context of a wrapper mediator architecture. We document our experiences in validating this model, and note successes and lessons learned. Using experimental data of query feedback from severalWebSources, we develop a Catalog and Access Cost model. We identify WebSource characteristics of the query feedback that are reflective of the particular WebSource behavior and identify groupings of WebSources based on these characteristics. We also characterize the Access Cost model as having High or Low Prediction Accuracy, with respect to its ability to predict access costs for the WebSources. We then correlate WebSource characteristics and groupings of WebSources with High or Low prediction accuracy of the model.


Prediction Accuracy Online Learning Cost Model Query Response Time Very Large Data Base 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Vladimir Zadorozhny
    • 1
  • Louiqa Raschid
    • 1
  • Tao Zhan
    • 1
  • Laura Bright
    • 1
  1. 1.University of MarylandCollege Park

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