Database systems were created to address the shortcomings of early file processing systems for managing commercial data. File processing systems store data redundantly across multiple files, leading to higher storage costs and potential inconsistencies. They also make it difficult to access data through queries not anticipated by existing programs. Database systems consolidate data in one place, reducing redundancy and improving data integrity and security by allowing selective access to authorized users only.

1. PURPOSE OF DATABASE
SYSTEM

2. PURPOSE OF DATABASE SYSTEMS
 Database systems arose in response to early methods of computerized
management of commercial data.
 The file-processing system is supported by a conventional operating
system.

3. Disadvantages
o Data redundancy and
inconsistency:
 Since different programmers create the files and application programs over long period
the various files are likely to have different structures and the programs may be written
in a several programming languages.
 This redundancy leads to higher storage and access cost.

4. o Difficalty in accessing
data:
 Suppose that one of the bank officers needs to find out the names of all customers
who live within a particular postal – code area. The officers ask the data process
department to generate such a list.
 Suppose that such a program is written,and that,several days later , the same bank
officer came to ask who have an account balance more than Rs.10000 or more.As
expected a program to generate such a list doesn’t exist.

5. o Data Isolation:
 Data are scattered in various files , and files maybe in database
formats , writing new application programs to retrieve the
appropriate data is difficult.
o Integrity
Problems:
 The data values stored in the database must satisfy certain types of
consistency constrains to satisfied.

6. o Security problems:
 Not every user of the database system should be able to access all the data.

7. PRESENTATION BY:-
INBATAMILARASU M