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Using 2-way Semijoins in Distributed Query Processing
- Authors
- Kang, Hyunchul; Roussopoulos, Nick
- Issue Date
- 1987
- Publisher
- IEEE, New York, NY, USA
- Citation
- 1987 IEEE Third International Conference on Data Engineering, pp 644 - 651
- Pages
- 8
- Journal Title
- 1987 IEEE Third International Conference on Data Engineering
- Start Page
- 644
- End Page
- 651
- Abstract
- In distributed query processing, the semijoin has been used as an effective operator in reducing relations referenced in the query to reduce the total amount of data transmission. The authors propose a relational algebra operator, two-way semijoin, which is an extended version of the semijoin, for more cost-effective distributed query processing. The two-way semijoin is compared to the semijoin in terms of the reduction power and the propagation of reduction effects. It is shown that the two-way semijoin has more reduction power than the semijoin and that the propagation of reduction effects by the two-way semijoin is further than by the semijoin.
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