A method and a system for managing data of a database in a MES system enables improved horizontal scalability of the client-server applications. The manufacturing execution system manages and controls the planning and execution of a production process of a product. Resources and clients generate and request data related to the production process. A relational database system includes a write database and a read database. A central service bus links the resources to the write database. A logical worker entity handles commands from the resources and clients queued in the central service bus, thereby interpreting the actions related to the write database, collecting the data required to complete the actions, and launching the execution of the command. A logical reader entity captures all data requests from the resources and clients, launching the requests for data from the read database and sending the data back to the requesting resource or client.