Abstract: In this paper, lost update problem occurs when two users read and update the same data in a particular row of the same database at the same time. one of the main problems found in tools that support MDE is the fact that little attention is paid to questions related to the platform features in the software development trajectory. Many machine learning algorithms iteratively transform some global state (e.g., model parameters or variable assignment) giving the illusion of serial dependencies between each operation.

Keywords: Update, Pessimistic, Optimistic, Concurrency, Roles.