A method and system for managing transactions is provided. A transaction is initiated on a first data by a first entity with the first data being comprised in a basis memory. A change in the first data is moved as a second data to a transaction memory. The second data is read from the transaction memory if a request for reading the first data is received from the first entity. The first data is read from the basis memory if the request for reading the first data is received from a second entity. The write access of the second entity to the first data is locked.