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The existence condition of γ-acyclic database schemes with MVDs constraints

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Abstract

It is very important to use database technology for a large-scale system such as ERP and MIS. A good database design may improve the performance of the system. Some researches show that a γ-acyclic database scheme has many good properties, e.g., each connected join expression is monotonous, which helps to improve query performance of the database system. This what conditions are needed to generate a γ-acyclic database scheme for a given relational scheme? In this paper, the sufficient and necessary condition of the existence of γ-acyclic, join-lossless and dependencies-preserved database schemes meeting 4NF is given.

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Authors and Affiliations

  1. Department of Computer and Engineering, Harbin Institute of Technology, 150001, Harbin, P.R. China

    Hao Zhongxiao & Yao Chunlong

  2. Department of Computer and Technology, Qiqihar University, 161006, Qiqihar, P.R. China

    Hao Zhongxiao & Yao Chunlong

  3. School of Computer and Control, Harbin University of Science and Technology, 150080, Harbin, P.R. China

    Hao Zhongxiao

Authors
  1. Hao Zhongxiao
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  2. Yao Chunlong
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Additional information

This work is supported by Natural Science Foundation of Heilongjiang Province under the project of “Organization of Acyclic Databases”, No.F00-06.

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Zhongxiao, H., Chunlong, Y. The existence condition of γ-acyclic database schemes with MVDs constraints. J. Comput. Sci. & Technol. 17, 517–521 (2002). https://doi.org/10.1007/BF02943293

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  • DOI: https://doi.org/10.1007/BF02943293

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