1. A computer-implemented method of updating a computer program, the method comprising: identifying a record related to a data structure, the record being effected in the updating of the computer program, the data structure being accessible by the computer program; receiving a request during the updating of the computer program to access a further record related to the data structure; identifying the further record in the request matching the record effected in the updating of the computer program; and preventing the request from accessing the further record based on the further record matching the record.