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- W2171750249 abstract "Outerjoin is used in distributed relational multidatabase systems for integrating local schemas to a global schema. Queries against the global schema need to be modified, optimized, and decomposed into subqueries at local sites for processing. Since outerjoin combines local relations in different databases to form a global relation, it is expensive to process. In this paper, based on the structure of the query and the definition of the schemas, queries with outerjoin, join, select and project operations are optimized. Conditions where outerjoin can be avoided or be transformed into a one-side outerjoin are identified. By considering these conditions the response time for query processing can be reduced." @default.
- W2171750249 created "2016-06-24" @default.
- W2171750249 creator A5082498558 @default.
- W2171750249 date "1990-01-01" @default.
- W2171750249 modified "2023-09-25" @default.
- W2171750249 title "Outerjoin optimization in multidatabase systems" @default.
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- W2171750249 doi "https://doi.org/10.1145/319057.319101" @default.
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