Earlier computer applications stored information almost based on existing clerical methods in much the same way as manual files. But the computer's processing speed gave a potential from different sources to produce valuable management information for relating data. The idea becomes visible of the integrated database as a central resource. Data is captured and transmitted to the database close to its origin point then extracted by anyone when ever needed within the organization. It still gives possibly of the strongest motivation for the Database Management Systems introduction in large organisations however for this idea in practice many conditions are attached. The idea is that any information is stored and entered just once, reducing the possibility of inconsistency and duplications of effort between different departmental records.

Organizational necessities need to be occasionally adjusted and change over time, and applications programs are developed arduously. Leaving the applications developer to focus on particular organizational necessities, in a standard way a Database Management Systems gives some protection against change by retrieval functions and taking care of basic storage. In general a Database Management Systems is a great piece of software, the product of lots of man & lots of year’s effort. Changes in one of these areas need not have impact in another place. It can probably offer more facilities than the economic in a find product, because its development expenditure is put on a number of buyers.

The above discussed points are probably most relevant for the large organization that uses Database Management Systems as its administrative functions. The prime consideration may be Database Management Systems convenience. The buyer of a small trade computer wishes all the software to run it in package form, written so that the minimum of expertise is mandatory to use it. The same concerns to the R & D departments with particular needs and that cannot be fulfilled by a large centralized system. When database management systems are compared it is clear that some are designed in accordance with professional DP staff that is available to run them, while others are designed for the total apprentice.

There are some costs related with adopting a Database Management Systems. The actual monetary costs generally differ for a small PC-based system to a large multi-user Oracle system. In the first case the cost will be software with the manual and in the second case the cost will cover training, general documentation, the periodical up gradation; support etc. to the software.

The main cost of the Database Management Systems linked with the work involved in implementing and designing systems to use it. But there is also a trend for the software cost to reflect the hardware cost it is running.