view determinacy for preserving selected information in data transformations

ISCAS OpenIR

	view determinacy for preserving selected information in data transformations
	Fan Wenfei; Geerts Floris; Zheng Lixiao
	2011
发表期刊	Information Systems
ISSN	3064379
页码	-
摘要	When transforming data one often wants certain information in the data source to be preserved, i.e.,we identify parts of the source data and require these parts to be transformed without loss of information. We characterize the preservation of selected information in terms of the notions of invertibility and query preservation, in a setting when transformations are specified as a view V (a set of queries), and source information is selected by a query Q. We investigate the problem for determining whether transformations V preserve the information selected by Q. (1) We show that the notion of invertibility coincides with view determinacy studied for query rewriting. (2) We establish the undecidability of the problem when either Q or V is in DATALOG or first-order logic, for invertibility and query preservation. (3) When Q and V are conjunctive queries (CQ), the problem is as hard as view determinacy for CQ queries and CQ views, an open problem. Nevertheless, we provide complexity bounds of the problem, either in ptime or np-complete, when V ranges over subclasses of CQ (i.e.,SP, SC, PC), and when Q is assumed to be a minimal CQ query or not. (4) We show that CQ is complete for L - to - CQ rewriting when L is SP, SC or PC, i.e.,every CQ query can be rewritten in terms of SP, SC or PC views using a query in CQ. © 2011 Elsevier Ltd. All rights reserved.
收录类别	ei
部门归属	(1) University of Edinburgh, United Kingdom; (2) Institute of Software, Chinese Academy of Sciences, P.O. Box 8718, Beijing 100190, China
语种	英语
WOS记录号	WOS:000296991000001
引用统计
内容类型	期刊论文
URI标识	http://ir.iscas.ac.cn/handle/311060/13987
专题	中国科学院软件研究所
推荐引用方式 GB/T 7714	Fan Wenfei,Geerts Floris,Zheng Lixiao. view determinacy for preserving selected information in data transformations[J]. Information Systems,2011:-.
APA	Fan Wenfei,Geerts Floris,&Zheng Lixiao.(2011).view determinacy for preserving selected information in data transformations.Information Systems,-.
MLA	Fan Wenfei,et al."view determinacy for preserving selected information in data transformations".Information Systems (2011):-.

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