characteristics of db system db uses structured semi-structured and unstructured data data models schema and three schema architecture first of all dbms database management system databases on a database management system a database management system is a collection of interrelated data and a set of programs to access those data e-dbms database contains information relevant to an enterprise then dbms in the primary goal a lingual main [Music] sir [Music] is [Music] foreign [Music] [Music] foreign who interact with the system by invoking one of the application programs that have have been written previously the programs knowledge users who write specialized database applications that do not fit into the traditional data processing framework even in programs for the information stored in a relational database is known as structured data nominal relational [Music] foreign that does not reside in a relational database relational databases semi-structured data but that has some organizational properties that make it easier to analyze foreign information a collection of conceptual diagrams that can be used to describe the structure of a database or a database industry describes a young editor you say in the collection of diagrams [Music] or physical data model it to provide concepts that describe the details of how data is stored in a computer storage media or a computer in the foreign or implementation data model which provide concept that may be easily understood by the end users other users an example on a network and hierarchical model for example a popular high level conceptual data okay relationship attribute network the overall design of a database system is called database schema number database external level describe the physical structure of the database or a database in can group foreign thank you