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The Optimization of Distributed Join in C-POREL System

Jin Hongping; Gu Junzhong;   

  1. East China Normal University Shanghai; East China Normal University Shanghai;
  • Online:1987-07-10 Published:1987-07-10

C-POREL is a distributed relational data base management system, with full distribution transparency. A relation can be horizontally fragmented into several subrelations allocated to different sites. When two or more fragmented relations appear in a join query, many-to- many semijoins between correspondent relations are usually needed in order to fully reduce relations involved. Distribution dependent attributes of a relational schema are defined in this paper. An optimization approach of distributed join w...

Key words: type theory,inductive type,w-set;

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[5] Hopping Jin, Query Processing Strategies and Optimization, Ms. Thesiss of East China Normal Univ., March 1986. ……….
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