Relational Database Management System (RDBMS)

Relational Database Management System

Tutorial Contents

What is RDBMS

A Relational Database Management System (RDBMS) is a Database Management System based on relational model introduced by E.F Codd. In relational model data is represents in terms of rows.

A type of database in which data is organized across one or more tables. Tables are associated with each other through common fields called keys. In contrast to other database structures, an RDBMS requires few assumptions about how data is related or how it will be extracted from the database.

Usage

RDBMS is use to manage relational databases. Relational database is a collection of organized set of tables from which data can be access easily.

What is Table

A Relational database’s, table is a collection of data elements organized in trams of rows and columns. A table is a considered as convenient representation of relations. In below an example of marksheet table;

ID	Name	Gender	Marks	Grade
001	Alex	M	488	AA
002	James	M	478	+A
003	Mary	F	475	+A
004	Robert	M	466	A
005	Elizabeth	F	459	A

RDBMS vs DBMS

RDBMS	DBMS
Data stored is in table format	Data stored is in the file format
Multiple data elements are accessible together	Individual access of data elements
Data in the form of a table are linked together	No connection between data
Normalization is present in RDBMS.	Normalization is not present in DBMS.
Support distributed database	No support for distributed database
Data is stored in a large amount	Data stored is a small quantity
Here, redundancy of data is reduced with the help of key and indexes in RDBMS	Data redundancy is common
RDBMS supports multiple users	DBMS supports a single user
It features multiple layers of security while handling data	There is only low security while handling data
The software and hardware requirements are higher	The software and hardware requirements are low
Example: Oracle, SQL Server.	Example: mysql, postgre, sql server, oracle etc.