Database Management System | Lecture Note

University:
Amherst College
Course:
COSC 257 | Databases
Academic year:

2021
Views:

484

Pages:

25
Author:

Kaiden Murphy

DATABASE MANAGEMENT SYSTEM management software database system DBMS system data software technology What is DBMS? Database Management System (DBMS) is a software for storing and retrieving users' data while considering appropriate security measures. It consists of a group of programs which manipulate the database. The DBMS accepts the request for data from an application and instructs the operating system to provide the specific data. In large systems, a DBMS helps users and other third-party software to store and retrieve data. DBMS allows users to create their own databases as per their requirement. The term "DBMS" includes the user of the database and other application programs. It provides an interface between the data and the software application. Popular DBMS Software MySQL Microsoft Access ➤Oracle PostgreSQL dBASE FoxPro ➤SQLite ➤IBM DB2 LibreOffice Base MariaDB Microsoft SQL Server etc. Application of DBMS Sector Use of DBMS Banking For customer information, account activities, payments, deposits, loans, etc. Airlines For reservations and schedule information. Universities For student information, course registrations, colleges and grades. Telecommunica tion It helps to keep call records, monthly bills, maintaining balances, etc. Finance For storing information about stock, sales, and purchases of financial instruments like stocks and bonds. Sales Use for storing customer, product & sales information. Application of DBMS Sector Use of DBMS Manufacturing It is used for the management of supply chain and for tracking production of items. Inventories status in warehouses. HR Management For information about employees, salaries, payroll, deduction, generation of paychecks, etc. Types of DBMS Hierarchical Network Relational Object Oriented Hierarchical database Network database Relational database Object-Oriented database Hierarchical DBMS In a Hierarchical database, model data is organized in a tree-like structure. Data is Stored Hierarchically (top down or bottom up) format. Data is represented using a parent-child relationship. In Hierarchical DBMS parent may have many children, but children have only one parent. Network Model The network database model allows each child to have multiple parents. It helps you to address the need to model more complex relationships like as the orders/parts many-to-many relationship. In this model, entities are organized in a graph which can be accessed through several paths. Relational model Relational DBMS is the most widely used DBMS model because it is one of the easiest. This model is based on normalizing data in the rows and columns of the tables. Relational model stored in fixed structures and manipulated using SQL. Object-Oriented Model In Object-oriented Model data stored in the form of objects. The structure which is called classes which display data within it. It defines a database as a collection of objects which stores both data members values and operations. Advantages of DBMS DBMS offers a variety of techniques to store & retrieve data DBMS serves as an efficient handler to balance the needs of multiple applications using the same data Uniform administration procedures for data Application programmers never exposed to details of data representation and storage.

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