
Systems design
Business databases
We have explained how using a data dictionary can help you create
your physical data files. Indeed, you will often see very quickly that
there are logical combinations of data elements which can be used in
designing files.
In relatively simple systems it is common to have a number of
separate files, such as customer file, products file, etc., each with its
own distinct function. A more recent development on computer
systems, even on business microcomputers, is to use a database
management system
(DBMS).
A DBMS will normally have the following characteristics:
1 It is a single collection of all the data used ...