Guest editorial

Guest editorial The VLDB Journal (2001) 10: 119 / Digital Object Identifier (DOI) 10.1007/s007780100053 The Twenty-Sixth International Conference on Very Large tations and search capabilities. The mediator must translate Data Bases was held in Cairo, Egypt, September 10–14, 2000. original user queries to target sources for execution.This trans- The conference call for papers resulted in 349 papers submit- lation problem has become critical now that a wide range of ted to the three program committees:Americas; Europe,Africa disparate sources are just “one click away” across the inter- and the Middle East; and the Far East,Asia, andAustralia. The net. This paper presents a framework for finding the perfect papers in this special issue were selected by the VLDB 2000 mapping, if possible, or in general the closest approximations. program committees as the best papers from the 53 papers The problem of efficiently answering queries is addressed presented in Cairo. The authors of these five papers were then in “MiniCon: A scalable algorithm for answering queries us- invited to present fuller revised papers for this special issue. ing views”. In this paper, the authors propose a novel algo- These were then further developed through a round of refer- rithm that uses a set of previously materialized views over the eeing. database, rather than accessing the database relations. This The papers in this special issue reflect the diversity of is- problem is quite relevant to a wide variety of data management sues that are being addressed by the database community to problems, such as data integration and query optimization. solve the variety of challenges we have to deal with in man- Another approach for query processing is proposed in “Ap- aging information in different circumstances. One of the main proximate query processing using wavelets”. Today’s deci- objectives of VLDB 2000 was to contribute to broadening the sion support systems often have very stringent response times database field. We believe that these diversity and broadening and deal with huge volumes of data. The authors propose are well reflected in this collection of papers. the use of multi-dimensional wavelets as an effective tool The paper “PicoDBMS: Scaling down database techniques for general-purpose approximate query processing in modern, for the smartcard” addresses the important problems faced high-dimensional applications. Novel query-processing algo- by database designers when confronted with the severe hard- rithms are developed that allow the processing of arbitrarily ware limitations imposed by smartcards, which are being used complex queries entirely in the wavelet coefficient domain. successfully in many applications involving money, propri- “User-cognizant multidimensional analysis” also delves etary and personal data. The paper proposes a database design into the problem of multidimensional data sets. A tool is de- specifically suitable for such environments, namely the Pi- veloped for enhanced exploration of On Line Analytical Pro- coDBMS. cessing data that is adaptive to a user’s prior knowledge of the In “Efficiently publishing relational data as XML docu- data. At any time, the user can query for the most surprising ments” the authors characterize and study the performance of unvisited parts of the data. The paper demonstrates that such different alternatives for publishing relational data as XML user-in-the-loop exploration will enable much faster assimi- documents. XML is rapidly emerging as a standard for ex- lation of all significant information in the data compared to changing business data on the World Wide Web. However, existing manual explorations. most business data are and will be stored in relational databases In conclusion, we would like to thank all the individuals in the foreseeable future. The paper shows that constructing who made VLDB 2000 a success. In particular, we would like XML documents inside the relational engine can have signif- to thank the general conference chair, Nabil Kamel, and the icant performance benefits. general PC chair, Michael Brodie. Also, special thanks go to “Approximate query mapping: Accounting for translation the program committee members and especially those who closeness” presents a mechanism for approximately translat- participated in the extra reviewing for this special issue. ing Boolean query constraints across heterogeneous informa- Amr El Abbadi, Gunter Schlageter, and Kyu-Young Whang tion sources. Mediator systems are increasingly being used to integrate information sources with different data represen- Published online: 13 June 2001 –  c Springer-Verlag 2001 The VLDB Journal Springer Journals
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Copyright © 2001 by Springer-Verlag Berlin Heidelberg
Computer Science; Database Management
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