Posted on: January 21, 2025 Posted by: rahulgite Comments: 0

ExecutorService in Java: Overview, Functions, and Examples

The ExecutorService is part of the java.util.concurrent package in Java and provides a powerful framework for managing threads. It simplifies concurrent programming by abstracting the creation, management, and termination of threads. Key Features of ExecutorService Common Methods in ExecutorService 1. execute(Runnable command) Executes a Runnable task asynchronously. Example: 2. submit(Callable<T> task) or submit(Runnable task) Submits a task for execution and returns a Future object. With Callable, you can get a…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

SQL Tables, Views, Backups, and Interview Questions with Answers

1. Tables in SQL Tables are the basic structure in SQL to store data in rows and columns. Creating a Table Modifying a Table Deleting a Table 2. Views in SQL A view is a virtual table based on the result of a SELECT query. Creating a View Using a View Updating a View Deleting a View 3. Copying Databases and Tables Copying a Table Copying a Database Using a…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

SQL Indexes – Comprehensive Guide

1. Introduction to SQL Indexes Indexes in SQL are database objects that improve the speed of data retrieval operations on a table. They work like a book index, helping the database locate data without scanning the entire table. 2. Benefits of SQL Indexes 3. Types of SQL Indexes 3.1 Single-Column Index An index created on a single column. Use Case: Example: 3.2 Composite Index An index created on two or…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

SQL Joins – Comprehensive Guide

1. Introduction to SQL Joins SQL Joins are used to combine rows from two or more tables based on a related column. They are essential for querying data stored across multiple tables in a relational database. 2. Types of SQL Joins 2.1 INNER JOIN Retrieves records that have matching values in both tables. Syntax: Example: Consider two tables: id name course_id 1 John 101 2 Jane 102 3 Alice NULL…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

SQL Comprehensive Guide

1. Introduction to SQL SQL (Structured Query Language) is a standard language used to interact with relational database systems. It allows users to query, manipulate, and manage data efficiently. 2. SQL Commands SQL commands are categorized into the following types: 2.1 Data Definition Language (DDL) Used to define and manage database schema. Command Description Example CREATE Creates a new database, table, or other database objects. CREATE TABLE students (id INT,…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

Trading System Design: Step-by-Step Guide

This document outlines the design for a trading system with detailed explanations of each step, tools used in the Spring/Java ecosystem, alternatives, and recommendations. A flow chart is also included to demonstrate the system’s workflow. 1. Understanding Requirements Before starting the design, gather functional and non-functional requirements: 2. Architecture Overview Design a modular and scalable architecture with the following layers: Tools: 3. Database Design Tools: Alternatives: 4. Core Components Order…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

Comprehensive List of Linux Commands

Linux commands are used to interact with the operating system’s shell. Below is a categorized list of essential Linux commands with explanations and practical examples. 1. File and Directory Management ls cd pwd mkdir rm mv find 2. File Content Viewing and Editing cat less nano vim grep 3. Permissions and Ownership chmod chown umask 4. Process Management ps top kill htop bg and fg 5. Networking Commands ping curl…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

Kubernetes: Detailed Overview with Architecture, Commands, Uses, and Examples

Kubernetes is an open-source container orchestration platform designed to automate deployment, scaling, and management of containerized applications. It provides a robust framework for managing distributed systems with resilience and scalability. Kubernetes Architecture Kubernetes follows a master-worker architecture comprising various components that work together to manage and scale containers. 1. Master Node The master node controls and manages the Kubernetes cluster. Key components include: 2. Worker Nodes Worker nodes run the…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

Docker: In-Depth Explanation, Architecture, Commands, Uses, and Examples

Docker is a platform that enables developers to build, deploy, and manage applications in lightweight, portable containers. Containers encapsulate application code and dependencies, ensuring consistency across development, testing, and production environments. Docker Architecture Docker follows a client-server architecture comprising: 1. Docker Client 2. Docker Daemon 3. Docker Images 4. Docker Containers 5. Docker Registries 6. Networking Core Docker Commands Basic Commands Image Management Container Management Build and Push Volume Management…

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Posted on: January 19, 2025 Posted by: rahulgite Comments: 0

Kafka Architecture, Internal Working, and Integration with Spring Boot

Apache Kafka is a distributed messaging system designed to handle high-throughput, fault-tolerant, and real-time data streams. It enables communication between producers (data publishers) and consumers (data subscribers). Kafka Architecture The Kafka architecture comprises the following key components: – Producers – Topics – Partitions – Brokers – Consumers 6. Consumer Groups 7. ZooKeeper (Deprecated in modern Kafka setups) 8. Replication Kafka Offsets and Internal Working Offsets How Offsets Work Key Offset…

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