Database Management System Last Minute Notes [Part - 1]

Prasun Das| July 1, 2022 at 8:11 PM | 3 minutes Read

What is actually DBMS?

A Database Management System (DBMS) is system software used to manage the organization by storage, access, modification, and integrity of data in a structured database. A DBMS allows end-users to systematically create, read, update and delete data in a database. The DBMS essentially serves as an interface between the database and end-users, ensuring that data is consistently organized and easily accessible.

Why do we need DBMS?

Efficient Data Management

A database is responsible for storing and managing a large amount of data on a daily basis. This would not

be possible using any other conventional tool such as a spreadsheet as they would simply not work.

Improved Data Sharing and Data Security

A proper database management system helps to increase organizational accessibility to

data, which in turn enables the end-users to share the data quickly and effectively across the

whole organization.


A database can be said to be pretty accurate as it has all sorts of built-in constraints, checks etc. This

means that the information available in a database is guaranteed to be correct in the majority of scenarios.

Data Updation Convenience

In a database, it is real easy to update the data using various Data Manipulation languages

(DML) available. One of these languages is SQL.

Effective Data Integration

Implementing a data management system promotes an integrated and efficient picture of an

organization’s operations. It becomes easier to see how processes in one segment of the

organization affect the other segments.

Difference between file management system & DBMS

So, thus we can understand the differences between the traditional file management system & DBMS from the above-mentioned points. Here is a detailed comparison between the two,

Some important terminologies regarding DBMS


The data stored in a database at a particular moment of time is called an instance of the


For example, let's say we have a single table employee in the database, today the table

has only like 10 records, so today the instance of the database has those 10 records only. Let's say, we are going to add another 1000 records in this table by tomorrow so the instance of the

database tomorrow will have 1010 records in that table named employee.


A database schema is a structure that represents the logical representation of the data in a particular database. Schema can be classified into three types: i) Physical Schema, ii) Logical Schema & iii) View Schema.

Database Architecture

A Database Architecture is a simple representation of DBMS design. It helps to design, develop, implement, and maintain the entire database management system. A DBMS architecture allows us to divide the database system into individual components that can be independently modified, replaced and/or altered. 

Database Architecture

This can be classified into 3 types: i) 1-Tier Architecture, ii) 2-Tier Architecture & iii) 3-Tier Architecture.

1-Tier Architecture

i) In this architecture, the database is directly available to the user. 

ii) It means the user can directly sit on the DBMS and uses it. Any kind of changes done here will directly be done on the database itself. It doesn't provide a handy tool for the end-users. 

iii) The 1-Tier architecture is used for the development of the local application, where programmers can directly communicate with the database for a quick response.

2-Tier Architecture

i) The 2-Tier architecture is the same as the basic client-server. In the two-tier architecture, applications on the client end can directly communicate with the database on the server side. For this kind of interaction, one example that we can think of can be JDBC.

ii) The user interfaces and application programs are run on the client side.

iii)The server side is responsible to provide the functionalities like query processing and transaction management.

iv) To communicate with the actual DBMS, the client-side application establishes a connection with the server-side.

3-Tier Architecture

i)The 3-Tier architecture contains another layer between the client and server. In this type of architecture, the client is unable to directly communicate with the server.

ii) The application on the client-end interacts with an application server which further communicates with the database system.

iii) End user has no idea about the existence of the database beyond the application server. The database has no idea about any other user beyond the application.

iv) The 3-Tier architecture is the one that is being used in the majority of large-scale web applications.

In this part we have covered the basics of database management system . In the upcoming part we will cover normalization , SQL , and important interview related questions.

Thanking Snehomoy Maitra for contributing to this blog

#dbms#cheatsheet#computer fundamentals#fundamentals to learn
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