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      • Department of Computer Engineering
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      Efficient successor retrieval operations for aggregate query processing on clustered road networks

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      Author(s)
      Demir, E.
      Aykanat, Cevdet
      Date
      2010
      Source Title
      Information Sciences
      Print ISSN
      0020-0255
      Publisher
      Elsevier Inc.
      Volume
      180
      Issue
      14
      Pages
      2743 - 2762
      Language
      English
      Type
      Article
      Item Usage Stats
      133
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      Abstract
      Get-Successors (GS) which retrieves all successors of a junction is a kernel operation used to facilitate aggregate computations in road network queries. Efficient implementation of the GS operation is crucial since the disk access cost of this operation constitutes a considerable portion of the total query processing cost. Firstly, we propose a new successor retrieval operation Get-Unevaluated-Successors (GUS), which retrieves only the unevaluated successors of a given junction. The GUS operation is an efficient implementation of the GS operation, where the candidate successors to be retrieved are pruned according to the properties and state of the algorithm. Secondly, we propose a hypergraph-based model for clustering successively retrieved junctions by the GUS operations to the same pages. The proposed model utilizes query logs to correctly capture the disk access cost of GUS operations. The proposed GUS operation and associated clustering model are evaluated for two different instances of GUS operations which typically arise in Dijkstra's single source shortest path algorithm and incremental network expansion framework. Our simulation results show that the proposed successor retrieval operation together with the proposed clustering hypergraph model is quite effective in reducing the number of disk accesses in query processing. © 2010 Published by Elsevier Inc.
      Keywords
      Clustering
      Data retrieval operation
      Hypergraphs
      Road networks
      Storage management
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      http://hdl.handle.net/11693/22266
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.ins.2010.03.015
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