Operating System - Overview

An operating system acts as an intermediary between the user of a computer and the computer hardware. The purpose of an operating system is to provide an environment in which a user can execute programs in a convenient and efficient manner.

An operating system is software that manages the computer hardware. The hardware must provide appropriate mechanisms to ensure the correct operation of the computer system and to prevent user programs from interfering with the proper operation of the system.

Internally, operating systems vary greatly in their makeup, since they are organized along many different lines. The design of a new operating system is a major task. It is important that the goals of the system be well defined before the design begins. These goals form the basis for choices among various algorithms and strategies. Because an operating system is large and complex, it must be created piece by piece. Each of these pieces should be a well delineated portion of the system, with carefully defined inputs, outputs, and functions.

Comments

Spring Security with JWT for REST API

Spring is considered a trusted framework in the Java ecosystem and is widely used. It’s no longer valid to refer to Spring as a framework, as it’s more of an umbrella term that covers various frameworks. One of these frameworks is Spring Security , which is a powerful and customizable authentication and authorization framework. It is considered the de facto standard for securing Spring-based applications. Despite its popularity, I must admit that when it comes to single-page applications , it’s not simple and straightforward to configure. I suspect the reason is that it started more as an MVC application -oriented framework, where webpage rendering happens on the server-side and communication is session-based. If the back end is based on Java and Spring, it makes sense to use Spring Security for authentication/authorization and configure it for stateless communication. While there are a lot of articles explaining how this is done, for me, it was still frustrating to set it up for the f...

How to answer conflict-resolution interview questions

QUESTION 1: How do you deal with conflict? People aren’t going to get along with each other all the time. It’s just a fact. Employers want to know that you can respond to conflict diplomatically, says job-search and interview coach Thea Kelley. If you’re a my-way-or-the-highway type of personality, you’re not going to get very far in the interview. Start off by emphasizing communication and respectfulness as a means to conflict resolution. For example, “I always take the person aside and discuss the issue privately. I listen actively to make sure I understand the other person’s point of view, and I work with the person to develop a solution together.” Stress that even if you both don’t completely agree on the end result, you tried to at least meet each other halfway. Pro tip: “Don’t non verbally communicate resentment when telling a story,” Kelley advises. “Aggressive body language and tone of voice can show that you harbor bad feelings.” QUESTION 2: Tell me about a time when you had ...

E-R Diagrams in DBMS

E-R Diagrams in DBMS: Components, Symbols, And Notations: E-R diagram is the short form of “Entity-Relationship” diagram. An e-r diagram efficiently shows the relationships between various entities stored in a database. In this article, we will discuss what are ER Diagram, ER Diagrams Symbols, Notations, Their various components like Entity, Attribute and Relationship. E-R Diagrams in DBMS: Components, Symbols, And Notations E-R diagrams are used to model real-world objects like a person, a car, a company etc. and the relation between these real-world objects. An e-r diagram has following features: E-R diagrams are used to represent E-R model in a database, which makes them easy to be converted into relations (tables). E-R diagrams provide the purpose of real-world modeling of objects which makes them intently useful. E-R diagrams require no technical knowledge & no hardware support. These diagrams are very easy to understand and easy to create even by a naive user. It gives a...

Search This Blog