Quality-Extended Query Processing for Mediation Systems

Quality-Extended Query Processing for Mediation Systems

Laure Berti-Equille (IRISA, France)
Copyright: © 2007 |Pages: 28
DOI: 10.4018/978-1-59904-024-0.ch002
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For non-collaborative distributed data sources, quality-driven query processing is difficult to achieve because the sources generally do not export data quality indicators. This chapter deals with the extension and adaptation of query processing for taking into account constraints on quality of distributed data. This chapter presents a novel framework for adaptive query processing on quality-extended query declarations. It proposes an expressive query language extension combining SQL and QML, the Quality of service Modeling Language proposed by Frølund and Koistinen (1998) for defining in a flexible way dimensions, and metrics on data, sources and services quality. The originality of the approach is to include the negotiation of quality contracts between the distributed data sources competing for answering the query. The principle is to find dynamically the best trade-off between the local query cost and the result quality. The author is convinced that quality of data (QoD) and quality of service (QoS) can be advantageously conciliated for tackling the problems of quality-aware query processing in distributed environments and more generally, that opens innovative research perspectives for quality-aware adaptive query processing.

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Table of Contents
John Talburt
Chapter 1
John Talburt, Richard Wang, Kimberly Hess, Emily Kuo
This chapter introduces abstract algebra as a means of understanding and creating data quality metrics for entity resolution, the process in which... Sample PDF
An Algebraic Approach to Data Quality Metrics for Entity Resolution over Large Datasets
Chapter 2
Laure Berti-Equille
For non-collaborative distributed data sources, quality-driven query processing is difficult to achieve because the sources generally do not export... Sample PDF
Quality-Extended Query Processing for Mediation Systems
Chapter 3
M. Mehdi Owrang O.
Current database technology involves processing a large volume of data in order to discover new knowledge. However, knowledge discovery on just the... Sample PDF
Discovering Quality Knowledge from Relational Databases
Chapter 4
Zbigniew J. Gackowski
This chapter presents a qualitative inquiry into the universe of quality attributes of symbolic representation such as data and information values.... Sample PDF
Relativity of Inforamtion Quality: Ontological vs. Teleological, Internal vs. Eternal View
Chapter 5
Karolyn Kerr, Tony Norris
Data quality requirements are increasing as a wider range of data becomes available and the technology to mine data shows the value of data that is... Sample PDF
The Development of a Health Data Quality Programme
Chapter 6
Ismael Caballero, Mario Piattini
This chapter introduces a way for assessing and improving information quality at organizations. Information is one of the most important assets for... Sample PDF
Assessment and Improvement of Information Quality
Chapter 7
Elizabeth M. Pierce
This paper takes the basic constructs of the IP-Map diagram and demonstrates how they can be combined with the Event-Driven Process Chain... Sample PDF
Integrating IP-Maps with Business Process Modelling
Chapter 8
Latif Al-Hakim
This chapter considers information flow as an important dimension of information quality and proposes a procedure for mapping information flow. The... Sample PDF
Procedure for Mapping Information Flow: A Case of Surgery Management Process
Chapter 9
Zhanming Su, Zhanming Jin
Product Information Quality (PIQ) is critical in manufacturing enterprises. Yet, the field lacks comprehensive methodologies for its evaluation. In... Sample PDF
A Methodology for Information Quality Assessment in the Designing and Manufacturing Processes of Mechanical Products
Chapter 10
Andy Koronos, Shien Lin
This chapter discusses the critical issues of information quality (IQ) associated with engineering assets management. It introduces an asset... Sample PDF
Inforamtion Quality in Engineering Asset Management
Chapter 11
Zhenguo Yu, Ying Wang
This chapter presents a survey into quality management practice regarding statistics and financial data in China. As a fast-developing country... Sample PDF
Quality Management Practices Regarding Statistical and Financial Data in China
Chapter 12
Suhaiza Zailani, Premkumar Rajagopal
This paper introduces how information quality plays an important role in a supply chain performance. In order to make smarter use of global... Sample PDF
The Effects of Information Quality on Supply Chain Performance: New Evidence from Malaysia
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