chapter  10
16 Pages

Database management systems

Because the cost of maintaining a database increases with its size, care must be taken when working with large quantities of data to ensure that the same information is not duplicated unnecessarily. Avoiding such data redundancy helps to serve another important database function, which is to achieve consistency, whereby data values referring to the same entity are not contradictory, as could happen if a value was updated in one part of the database but not in another.