11752127 2109SPi-5 4 3 2 1 0 To our families PrefaceWe are in an information era where generating and storing large amounts of data are commonplace.A growing number of organizations routinely handle terabytes and exabytes of data, and individual digital data collections easily reach multiple gigabytes.Along with the increases in volume, the modality of digitized data that requires efficient management and the access modes to these data have become more varied.It is increasingly common for business and personal data collections to include images, video, voice, and unstructured text; the retrieval of these data comprises various forms, including structured queries, keyword search, and visual access.Data have become a highly valued asset for governments, industries and individuals, and the management of these data collections remains a critical technical challenge.Database technology has matured over the past four decades and is now quite ubiquitous in many applications that deal with more traditional business data.The challenges of expanding data management to include other data modalities while maintaining the fundamental tenets of database management (data independence, data integrity, data consistency, etc.) are issues that the community continues to work on.The lines between database management and other fields such as information retrieval, multimedia retrieval, and data visualization are increasingly blurred.This multi-volume Encyclopedia of Database Systems provides easy access to important concepts on all aspects of database systems, including areas of current interest and research results of historical significance.It is a comprehensive collection of over 1,250 in-depth entries (3,067 including synonyms) that present coverage of the important concepts, issues, emerging technology and future trends in the field of database technologies, systems, and applications.The content of the Encyclopedia was determined through wide consultations.We were assisted by an Advisory Board in coming up with the overall structure and content.Each of these areas were put under the control of Area Editors (70 in total) who further developed the content for each area, soliciting experts in the field as contributors to write the entries, and performed the necessary technical editing.Some of them even wrote entries themselves.Nearly 1,000 authors were involved in writing entries.The intended audience for the Encyclopedia is technically broad and diverse.It includes anyone concerned with database system technology and its applications.Specifically, the Encyclopedia can serve as a valuable and authoritative reference for students, researchers and practitioners who need a quick and authoritative reference to the subject of databases, data management, and database systems.We anticipate that many people will benefit from this reference work, including database specialists, software developers, scientists and engineers who need to deal with (structured, semi-structured or unstructured) large datasets.In addition, database and data mining researchers and scholars in the many areas that apply database technologies, such as artificial intelligence, software engineering, robotics and computer vision, machine learning, finance and marketing are expected to benefit from the Encyclopedia.We would like to thank the members of the Advisory Board, the Editorial Board, and the individual contributors for their help in creating this Encyclopedia.The success of the Encyclopedia could not have been achieved without the expertise and the effort of the many contributors.Our sincere thanks also go to Springer's editors and staff, including Jennifer Carlson, Susan Lagerstrom-Fife, Oona Schmid, and Susan Bednarczyk for their support throughout the project.Finally, we would very much like to hear from readers for any suggestions regarding the Encyclopedia's content.With a project of this size and scope, it is quite possible that we may have missed some concepts.It is also possible that some entries may benefit from revisions and clarifications.We are committed to issuing periodic updates and we look forward to the feedback from the community to improve the Encyclopedia.
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