Updating Logical Databases [Paperback]

The book will be of value to all involved in database research.This book tackles the problems of update algorithms for databases. How can one construct and maintain a database of facts, capable of incorporating new information and getting rid of all outdated information, and yet in the process not disturb any other information in the database?This book tackles the problems of update algorithms for databases. How can one construct and maintain a database of facts, capable of incorporating new information and getting rid of all outdated information, and yet in the process not disturb any other information in the database?This book tackles the problems of update algorithms for databases. How can one construct and maintain a database of facts, capable of incorporating new information and getting rid of all outdated information, and yet in the process not disturb any other information in the database? The author has produced a formal method of specifying the desired change intentionally using a formula-based approach to updating needs rather than a model-based technique. The complexity of the algorithms, choice of semantics and means of enforcing integrity constraints are also discussed.Acknowledgments; 1. Introduction; 2. Classes of update semantics; 3. Model-based semantics for updates; 4. Update algorithms for model-based semantics; 5. Updates with variables; 6. Lazy evolution of updates; 7. Integrity constraints; 8. Adding knowledge to relational theories; 9. Implementation; Bibliography; Index of definitions. The book is written in a readable and inspiring style. The motivations for new concepts are well explained. Urs-Martin KÜnzi, Journal of Symbolic Logic