Database Theory Why use database? Data is a valuable corporate resource which needs adequate accuracy, consistency and security controls. The centralized control of data means that for many applications the data will already exist, and facilitate quicker development. Data will no longer be related by application programs, but by the structure defined in the database. Easier to maintain systems

 The data can shared  Redundancy can be reduced/controlled  Inconsistency can be avoided  Transaction support can be provided  Integrity can be maintained  Security can be enforced  Conflicting requirements can be balanced  Standard can be enforced Benefits of Database Approach

 Controlling redundancy –Redundancy is storing the same data multiple times.  Duplication effort  Storage waste, when same data stored repeatedly  File that represent same data may became inconsistent.

Other Advantages of using the DBMS approach  Restricting unauthorized access to data  Providing Storage Structures (e.g. indexes) for efficient Query Processing  Providing backup and recovery services

Other Advantages of using the DBMS approach  Providing multiple interfaces to different classes of users  Representing complex relationships among data.