Source-aware multidatabase query processing
We introduce a multidatabase model to represent the information that derives from different local databases. This model, known as Tuple-Source (TS) relational model, accommodates tuples from different local databases by attaching them with their source information in the global relations which are a...
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| Main Authors: | , , |
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| Format: | text |
| Language: | English |
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Institutional Knowledge at Singapore Management University
1997
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| Subjects: | |
| Online Access: | https://ink.library.smu.edu.sg/sis_research/915 https://ink.library.smu.edu.sg/context/sis_research/article/1914/viewcontent/839c4cf3d0b7b1dcc6d3eaa9695652b73141.pdf |
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| Institution: | Singapore Management University |
| Language: | English |
| Summary: | We introduce a multidatabase model to represent the information that derives from different local databases. This model, known as Tuple-Source (TS) relational model, accommodates tuples from different local databases by attaching them with their source information in the global relations which are also known as TS-relations. In other words, a source attribute is implicit in every TS-relation. To manipulate the global relations, we have developed the TSSQL query language and implemented a distributed query processor to process such queries. In this paper, we report our distributed query processing architecture and algorithms. Our architecture consists of a query mediator and a number of query agents, one for each local database. By encapsulating the heterogeneous query interfaces to different local databases within the query agents, we allow a generic query processing strategy to be adopted by the query mediator. Our approach further ensures that local autonomy is preserved. |
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