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基于模式映射的视图合成

View Synthesis from Schema Mappings

Diego Calvanese, Giuseppe De Giacomo, Maurizio Lenzerini, Moshe Y. Vardi

摘要:

在数据管理中,特别是在数据集成、数据交换、查询优化和数据隐私中,视图的概念起着核心作用。在数据集成、数据混搭和数据仓库等多种环境中,需要从不同模式上的查询之间的一组已知对应关系开始设计视图。在本文中,我们处理这样的设计过程自动化的问题。我们称这个新的问题为“视图合成模式映射”:给定一组模式映射,每个相关的查询源模式的查询目标模式,自动合成每个源的视图在目标模式的方式,对于每个映射,查询源是一个重写的查询目标wrt的合成视图。我们研究视图合成模式映射在关系设置,查询和视图是(工会)合取查询,并在半结构化数据设置,查询和视图是(双向)定期路径查询,以及工会的合取。我们为每种情况提供了技术和复杂性上界。

英文摘要:

In data management, and in particular in data integration, data exchange, query optimization, and data privacy, the notion of view plays a central role. In several contexts, such as data integration, data mashups, and data warehousing, the need arises of designing views starting from a set of known correspondences between queries over different schemas. In this paper we deal with the issue of automating such a design process. We call this novel problem "view synthesis from schema mappings": given a set of schema mappings, each relating a query over a source schema to a query over a target schema, automatically synthesize for each source a view over the target schema in such a way that for each mapping, the query over the source is a rewriting of the query over the target wrt the synthesized views. We study view synthesis from schema mappings both in the relational setting, where queries and views are (unions of) conjunctive queries, and in the semistructured data setting, where queries and views are (two-way) regular path queries, as well as unions of conjunctions thereof. We provide techniques and complexity upper bounds for each of these cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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