3-1 Modeling Basic Entities DBMS Create Sort Search Addition Deletion Modification Create Sort Search Addition Deletion Modification DBMS is a Software package or concept that is used to : in the Database. DBMS

3-2 Modeling Basic Entities Database Database is an ORGANIZED collection of RELATED Data/Information/Record/Field Database The Database is usually presented in a tabular form by table form we mean columns and rows where each column represented by a specific field and each row is represented by a specific record.

3-3 Modeling Basic Entities Centralized Database All data are located at a single site. Advantage Provide greater control over accessing and updating. Disadvantage Failure cause, greater loss, no access Example:- Personal Computer Database, Central Computer database Client/Server database

3-4 Modeling Basic Entities Distributed Database A distributed database is a single logical database that is spread physically across computer in multiple location. Homogeneous Database Compatible Operating systems Same data model Same DBMS Common data format Heterogeneous Database Means different computers and different Operating Systems Different data models, Different DBMS,,,, MAY BE POSSIBLE

Database Development Approach The File Processing Approach This Approach focused on the data processing needs of individual departments, instead of evaluating the overall information needs of the organization.

3-6 Modeling Basic Entities Disadvantages Program-Data Dependence Duplication of Data Limited Data Sharing Lengthy Development Times Excessive Program Maintenance Program-Data Dependence Duplication of Data Limited Data Sharing Lengthy Development Times Excessive Program Maintenance

3-7 Modeling Basic Entities The Database Approach The Database approach emphasizes the integration and sharing of data throughout the organization

3-8 Modeling Basic Entities A Database Application A database application is an application program ( or set of related program ) that is used to perform a series of activities on behalf of database users.

3-9 Modeling Basic Entities Data Warehouse Personal Computer Database Workgroup Databases Department Databases Enterprise Databases Personal Computer Database Workgroup Databases Department Databases Enterprise Databases The Range of Database Application An integrated decision support database whose content is derived from the various operational databases.

3-10 Modeling Basic Entities Components of Database Environment Computer-aided Software Engineering ( CASE Tool ) Repository DBMS Database Application Program User Interface Data Administrator System Developer End Users Computer-aided Software Engineering ( CASE Tool ) Repository DBMS Database Application Program User Interface Data Administrator System Developer End Users