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- W15637906 abstract "Peer data management systems (PDMS) are a highly dynamic, decentral- ized infrastructure for large-scale data integration. They consist of a dynamic set of autonomous peers inter-connected with a network of schema mappings. Queries sub- mitted at a peer are answered with local data and by data that is reached along paths of mappings. Due to redundancies in the mapping network, query answering in PDMS can be very inefficient if the complete query result is to be computed. System P, a fully functional PDMS, compromises the completeness of the query result and reduces cost by pruning the query plan at mappings that are estimated to yield only few result tuples. The demo illustrates the following main components of System P: (1) adaptive estimation of result cardinalities of intermediate queries us- ing histograms, (2) completeness-driven query planning under limited resources using specialized heuristics, and (3) the automatic generation of heterogeneous PDMS test instances, controlled by a rich set of parameters." @default.
- W15637906 created "2016-06-24" @default.
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- W15637906 date "2007-01-01" @default.
- W15637906 modified "2023-09-26" @default.
- W15637906 title "System P: Completeness-driven Query Answering in Peer Data Management Systems." @default.
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