Week 14 (Reflection) 15 May 2013

          Today we get to learn about the data management. Data management enable us to have a systemeatic, no duplication and easy to be access. A database management system is a program could enable computer users create and access data in the database.

DBMS   DBMS = database management system (database software) is a software system designed to allow the definition, creation, querying, update, and administration of databases.


a) advantages of DBMS
1) Warehouse of Information
2) Defining Attributes
3) Systematic Storage
4) Changes to Schema
5) No language dependence
6) Table Joins
7) Multiple Simultaneous Usage
8) Data Security
9) Privileges
10) Abstract View of Data and Easy Retrieval
11) Data Consistency

Designing Databases
The three principal logical databases models are Hierarchical, network and relational.

Hierarchical data model

Network Data Model

Relational data model