Abstract: A digital telecommunication switching system having at least one master database and at least one dependent database in conjunction with administration and maintenance procedures. For assuring data consistency, administration and maintenance commands trigger the processing of administration and maintenance jobs AMO in a plurality of databases. The commands contain a designation of the respective administration and maintenance job, a designation of the action to be implemented, for example "modify", as well as parameter data that specify the program module AMO and the respective action. After the modification of a data set in the master database, the command is communicated unmodified to one or more dependent databases that extract the relevant data subset.

Abstract: A method for modifying system configuration data sets in a telecommunications switching system that has first function modules (SWU-ADS) for processing switching-oriented and/or administration and maintenance procedures and second peripheral function modules (VMS, ETB) for realizing supplementary performance features. For producing data consistency, backup copies are produced of the content of at least a part of the databases and administration and maintenance commands that modify database contents and that are subsequently input into the system, are listed in the form of command information in the chronological sequence of their occurrence. Every command information is supplemented with a database-associated information that indicates the implementation or non-implementation of the respective administration and maintenance command.