The Four-Schema Concept as the Gross Architecture of Distributed Databases and Heterogeneity Problems

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概要

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• This paper presents the gross architecture of distributed database (DDB), which consists of four schemas and mappings between them. We call it the four-schema structure (FSS). In the FSS, the heterogeneity of each DBMS, i.e. the differences of data models and languages, distributed over networks is first removed (call it homogenization), and then the distribution of such homogenized DBMS, i.e. the information of where required data is located, is removed (call it integration). Inverse mappings of them are respectively the translation of a common local query into DBMS queries, and the decomposition of a global query into local queries. In this paper, focusing on heterogeneity problem, we can present the FSS concept and DDB architecture based on it, show the homogenization process, and discuss the query translation and also required information (heterogeneity information or HI).

• 1979-11-30

著者

• Hamanaka E

  Development Department Jipdec

• TAKIZAWA M

  Development Department JIPDEC

関連論文

• The Four-Schema Concept as the Gross Architecture of Distributed Databases and Heterogeneity Problems

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