Recursive query plans for data integration
نویسندگان
چکیده
منابع مشابه
Recursive Query Plans for Data Integration
Generating query-answering plans for data integration systems requires to translate a user query, formulated in terms of a mediated schema, to a query that uses relations that are actually stored in data sources. Previous solutions to the translation problem produced sets of conjunctive plans, and were therefore limited in their ability to handle recursive queries and to exploit data sources wi...
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Generating query-answering plans for data integration systems requires to translate a user query, formulated in terms of a mediated schema, to a query that uses relations that are actually stored in data sources. Previous solutions to the translation problem produced sets of conjunctive plans, and were therefore limited in their ability to handle recursive queries and to exploit data sources wi...
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The goal of a data integration system is to provide a uniform interface to a multitude of data sources. Given a user query formulated in this interface, the system translates it into a set of query plans. Each plan is a query formulated over the data sources, and specifies a way to access sources and combine data to answer the user query. In practice, when the number of sources is large, a data...
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We describe Streamer, the query-reformulation component of a data integration system. Given a utility measure and a user query, Streamer uses abstraction-based reenement planning and exploits information on plan independence to produce, in decreasing order of utility, a set of plans that access data sources to obtain answers to the query. We then focus on plan coverage as an important utility m...
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Information integration systems provide a uniform query interface to a set of sources. One of the key challenges for an information integration system is to provide maximally complete answers to user queries and to execute user queries efficiently. We describe an approach to map re-cursive datalog programs into a streaming, data-flow execution system. We show that our method can be used in conj...
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ژورنال
عنوان ژورنال: The Journal of Logic Programming
سال: 2000
ISSN: 0743-1066
DOI: 10.1016/s0743-1066(99)00025-4