Any organization, be it a bank, Manufacturing company, Hospital, university, Conglomerate of a Governments departments , requires huge amount of data in some form or other. All such organization need reo collect data manipulate them and store them for future use. All such types of organization require data for a number of purposes, say;
A) Preparing sales reports
B) Forecasting sales
C) Preparing accounts reports
D) Getting medical histories of patients
Thus, we can say that data are very vital corporate resources. The amount of data used these data in organizations can be measured in the range of some billions of bytes or characters. The financial investment involved is also very high, Many organizations have become cortically dependent on the continued and successful operations of databases.