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A state model for the concurrency control problem in database management systems

The purpose of this paper is to propose a discrete event dynamical system model for concurrent actions by multiple users on one database. This model shows that concurrency control, which is the task of scheduling these users, is a case of control with partial state information. It is used to analyze and compare existing concurrency control techniques and to suggest new ones. In particular, the Two-Phase Locking and the Declare-BeforeUrdock protocols are studied in detail.