American Telephone & Telegraph Co., At&t Bell Laboratories

Terry R Nusser

Alan J Goldstein

A data base system is disclosed in which records are locked out during record changing by using a dynamically generated directed acyclic graph of the records. The edges of the graph, stored in the records themselves, point toward a 'root' record representing multiply-shared information. An application to the assignment of telephone facilities to telephone subscribers is also described. A transaction list is maintained to identify locked out records previously locked out during the same transaction.

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Flemington, NJ, United States of America

Terry R Nusser