System of networked data receiving stations

摘要

A database system comprises a group of stations (10-1,10-2,..10-n) linked by a network (12) and having a central station (14) for the safekeeping of the whole database. Certain classes of data, for example, those storing mobile telephone sites are sent from a station originating a modification to a second station either synchronously or asynchronously. Each option has advantages and disadvantages in terms of speed, security and system utilisation and these are optimised by making individual decisions for each situation using test criteria which assess the nature of the particular data concerned.