Database system architecture

Database system architecture provides a framework for developers of data base system.

1. Physical Level

Physical level is the lowest level which describes how data is physically stored sacara. For example we have the student data. At the physical level of student data is seen by noting that the data are stored attribute name in the media throughout the 20 bytes of storage.

2. Conceptual Level

This level describes the data stored in a database and relationships that occur between the data from the entire database. This level of attention to data stored in a database and relationships with other data. At this level designers typically create the database in the form of design diagrams.

3. Level user's view
This level is the highest level of data abstraction that describes only a part of visits and use of the entire database. This is because some database users do not need all the contents of the database. At this level the user is limited to the ability of hardware and software used for data base applications.