Parallel hierarchical evaluation of transitive closure queries

M.A.W. Houtsma, M.A.W. Houtsma, F. Cacace, S. Ceri

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Abstract

Presents a new approach to parallel computation of transitive closure queries using a semantic data fragmentation. Tuples of a large base relation denote edges in a graph, which models a transportation network. A fragmentation algorithm is proposed which produces a partitioning of the base relation into several fragments such that any fragment corresponds to a subgraph. One fragment, called high-speed fragment, collects all edges which guarantee maximum speed. Thus, the fragmentation algorithm induces a hierarchical relationship between the high-speed fragment and all other fragments. With this fragmentation, any query about paths connecting two nodes can be answered by using just the fragments in which nodes are located and the high-speed fragment. In general, if each fragment is managed by a distinguished processor, then the query can be answered by three processors working in parallel. This schema can be applied recursively to generate an arbitrary number of hierarchical levels
Original languageUndefined
Title of host publicationProceedings of the 1st International Conference on Parallel and Distributed Information Systems (PDIS 1991)
Place of PublicationLos Alamitos
PublisherIEEE
Pages130-137
Number of pages8
ISBN (Print)0-8186-2295-4
DOIs
Publication statusPublished - Dec 1991

Publication series

Name
PublisherIEEE

Keywords

  • IR-19243
  • METIS-119766
  • DB-PDB: PARALLEL DATABASES
  • EWI-7262

Cite this

Houtsma, M. A. W., Houtsma, M. A. W., Cacace, F., & Ceri, S. (1991). Parallel hierarchical evaluation of transitive closure queries. In Proceedings of the 1st International Conference on Parallel and Distributed Information Systems (PDIS 1991) (pp. 130-137). Los Alamitos: IEEE. https://doi.org/10.1109/PDIS.1991.183080