Database management systems
- 2. • DBMS is a software system for creating, organizing and managing the database. • It provides an environment to the user to perform operations on the database for creation, insertion, deletion, updating and retrieval of data.
- 3. TYPES OF DATABASE MANAGEMENT SYSTEMS • Hierarchical Databases • Network Databases • E-R Databases • Relational Database • Object-Oriented Databases
- 4. HIERARCHICAL DATABASES • Data is represented as a tree. • A record type can belong to only one owner type but a owner type can belong to many record type.
- 5. NETWORK DATABASES • It is modified version of Hierarchical databases where it allows more general connections among the nodes as well. • They are difficult to use but are more flexible than Hierarchical databases.
- 6. ENTITY-RELATIONSHIP DATABASES • It is a high level database model based on the need of the organization. • Its entities are distinguishable from other objects and relationship is an association among several entities.
- 7. RELATIONAL DATABASES • It is a lower level database model that uses a collection of tables to represent both data and relationships among those data. • Each table has multiple columns, depending on the number of attributes, and each column has a unique name..
- 8. OBJECT-ORIENTED DATABASES • It represents entity sets as class and a class represents both attributes and the behavior of the entity. • Instance of a class is an object. • The internal part of the object is not externally visible. • One object communicates with the other by sending messages.
- 9. THANK YOU!!!