Query optimization in xml-based information integration
Dongfeng Chen, Rada Y. Chirkova, Maxim Kormilitsin, Fereidoon Sadri, Timo J. Salo · 2008
The problem of decentralized data sharing is relevant for a wide range of applications and is still a source of major theoretical and practical challenges, in spite of many years of sustained research in information integration. We focus on the challenge of efficiency of query evaluation in information-integration systems, with the objective of developing query-processing strategies that are widely applicable and easy to implement in real-life applications. In our algorithms we take into account important features of today's data-sharing applications, namely: XML as likely interface to or representation for data sources; potential for information overlap across data sources; and the need for inter-source processing (i.e., joins of data across data sources) in many applications.