DBMS Tutorial

 

DBMS Tutorial

DBMS Tutorial contains various topics that will help you to master the database concepts and you can learn DBMS for your curriculum.

Database

The name itself indicates what it is. A database is a place/container where all the data is stored. But what is data?  In a database, even the smallest piece of information becomes data. For example, the Student is data, the course is data, and Color is data, height, weight, food everything is data. In short, all the living and non-living objects in this world are data.

Why we need data?

We need data so that we can perform various actions on them. Say, we do not have any database and we want to record what is the height and weight of a baby in a year. What we do is note it in a piece of paper every month. At the end of a certain period or year, we would check up if he/she is growing correctly. If some entry is wrong or irrelevant, we correct it or strike it off. The same is done using the database. We would be storing all this information in the database. If we want to check the growth, we would be pulling the information from the database, if we need to change any information, we can update/delete them. But all the data will be in one place – Database.

What type of data is stored in database?

In a database, we would be grouping only related data together and storing them under one group name called a table. This helps in identifying which data is stored where and under what name. It reduces the time to search for particular data in a whole database. For example, Student, Teacher, Class, Subject, Employee, Department, etc form individual tables.

DBMS Tutorial      DBMS Tutorial

And for whom these data are stored?

We store only related data – related to one particular requirement/application. For example, the Student database – it will have all the information of students ranging from his ID, Name, Date of birth, class, to grade, prizes who are studying in a particular College.

How do we determine which data is relevant to be put in a particular database?

It all depends on what database we are developing, and what is the exact requirement/purpose of it. Say, we need to create the College database. What could a college database contain? First thing is that we need to store college information like its name, address. Next comes courses offered in that college, Staff and their details, students and their details.  But do we store all this information under one table – College? Will the database be quick in getting the data or updating it? Certainly Not!  It would become chaos if everything is stored in a single table. Hence they introduce certain rules to manage the database – relational database management system (RDBMS). RDBMS is a program that guides us on how to create and maintain a database. It tells us how to divide related information into different tables and inter-relate them so that we can select/insert/update/delete all the related data easily and efficiently.

This DBMS tutorial is written to help students understand database concepts.

In the next articles, we will go through the database tutorial (Database Management Tutorial) on various topics.

Database Languages

Database Languages

Types of Database languages We need a method to create all the logical objects like tables, views, procedures and packages in the database and we...
Data Definition Language - DDL

Data Definition Language – DDL

DDLs are used to define the metadata of the database. i.e.; using this, we create schema, tables, constraints, indexes in the database.  DDLs are...
Data Manipulation Language - DML

Data Manipulation Language – DML

When we have to insert records into table or get specific record from the table, or need to change some record, or delete some...
Data Control Language - DCL

Data Control Language – DCL

Suppose we have created a table STUDENT in the database. Now who can view or access these tables? No one other than who has...
Transaction Control Language - TCL

Transaction Control Language – TCL

Suppose we have inserted some records in to Employee table. Now we need to save them. How? Similarly, we have updated something wrong on...
Database Interface

Database Interface

Interfaces are procedure, functions or package that are used for interacting with user or other applications We have tables, their records and we know how...
Data Models in DBMS

Data Models in DBMS

When we construct a building, we first plan what do need in the building, and then we put it in the form design on...
Object based Data Models

Object based Data Models

Imagine we have to design database for college. What is the real world entities involved with college? They are college, Students, Lecturer, Course, Subject,...
Physical Data Models

Physical Data Models

Physical data model represent the model where it describes how data are stored in computer memory, how they are scattered and ordered in the...
Record based Data Models

Record based Data Models

These data models are based on application and user levels of data. They are modeled considering the logical structure of the objects in the...

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