Forem: Rajdeep Ray

SQL vs NoSQL Databases

Rajdeep Ray — Mon, 25 Oct 2021 16:16:44 +0000

SQL

Relational database management system (RDBMS)
These databases have fixed or static or predefined schema
These databases are not suited for hierarchical data storage.
These databases are best suited for complex queries
Vertically Scalable
Example - MySQL, PostgreSQL, Oracle

NoSQL

Non-relational or distributed database system.
They have dynamic schema
These databases are best suited for hierarchical data storage.
These databases are not so good for complex queries
Horizontally scalable
Example - MongoDB, Cassandra, Redis

Docker vs Virtual Machine

Rajdeep Ray — Sat, 08 May 2021 11:38:27 +0000

What is Docker?

Docker is a tool that uses containers to make the creation, deployment, and running of applications a lot easier. It binds the application and its dependencies inside a container.
Container

OS level process isolation
Each container can share OS
Boots in seconds
Containers are lightweight
Pre-built docker containers are easily available
Containers are destroyed and re-created rather than moving
Containers can be created in seconds
Less resource usage

What is Virtual Machine?

A virtual machine is a system that acts exactly like a computer.

In simple terms, it makes it possible to run what appears to be on many separate computers on hardware, that is one computer. Each virtual machine requires its underlying operating system, and then the hardware is virtualized.

Hardware-level process isolation
Each VM has a separate OS
Boots in minutes
VMs are of few GBs
Ready-made VMs are difficult to find
VMs can move to new host easily
Creating VM takes a relatively longer time
More resource usage

Watch this YouTube video for more details

Object-Oriented Programming

Rajdeep Ray — Thu, 26 Nov 2020 15:32:39 +0000

Object-oriented programming is a method of implementation in which programs are organized as cooperative collections of objects, each representing an instance of some class and whose classes are all members of a hierarchy of classes united via inheritance relationship.

Object: An Object is an identifiable entity with some characteristics and behavior.

Class: Class is a user-defined data type, which holds its own data members and member functions, which can be accessed and used by creating an instance of that class. A class is like a template or a blueprint representing a group of objects that share common properties and relationships.

Object-Oriented Programming concepts

Data Abstraction
Data Encapsulation
Modularity
Inheritance
Polymorphism

Data Abstraction

Abstraction refers to the act of representing essential features without including the background details or explanations.

Data Encapsulation

Encapsulation is the wrapping up of data and operations/functions into a single unit (class).

Modularity

Modularity is the property of a system that has been decomposed into a set of cohesive and loosely coupled modules.

Inheritance

Inheritance is the capability of one class of things to derive capabilities or properties from another class.

Polymorphism

Polymorphism is the ability for a message or data to be processed in more than one form.

My First Hacktoberfest

Rajdeep Ray — Sat, 17 Oct 2020 05:41:04 +0000

What I Learned From Hacktoberfest

One of my Goals for 2020 was to contribute to open-source projects, and Hacktoberfest seemed like a perfect opportunity to achieve it.

As the Hacktoberfest began, I started searching for open-source projects to which I could contribute.
I finally found my first project on a repository on Data structures and Algorithms in C++ and Python, where I contributed by adding recursive programs in C++.
This motivated me to contribute more to the open-source community, and I contributed to another project on Python web-scripts by making a web-scraper.

Through Hacktoberfest, I had an experience with the open-source community and how to contribute to them. I look forward to making several such contributions in the future.