How to Simulate Lost Update in MySQL

How to Simulate Lost Update in MySQL

Simulating a lost update in MySQL involves demonstrating how concurrent transactions can lead to lost updates when one transaction overwrites changes made by another. This phenomenon is critical to understand for database design, particularly in applications where data integrity and consistency are paramount.  By using transaction isolation levels, particularly the default READ COMMITTED level, one…

@data vs @value: Key Differences and Usage

@data vs @value: Key Differences and Usage

When developing modern web applications, particularly with frameworks like Blazor or libraries like Vue.js and Angular, developers frequently encounter directives and attributes that help bind data to the UI. Two common concepts are @data and @value, which are used to bind information to HTML elements.  While they may seem similar, they have distinct purposes and…

Setting up EKS with Terraform 

Setting up EKS with Terraform 

Provisioning Amazon EKS (Elastic Kubernetes Service) using Terraform automates the process of building scalable Kubernetes clusters on AWS. Terraform acts as an Infrastructure as Code (IaC) tool that enables the definition, provisioning, and management of EKS clusters through declarative configurations.  To create a functional EKS cluster, you need to define a few key components such…

Terraform EKS Cluster Example

Terraform EKS Cluster Example

Terraform simplifies the process of provisioning resources by allowing you to define infrastructure as code. When setting up an Elastic Kubernetes Service (EKS) cluster on AWS, Terraform manages the entire workflow, automating resource creation and configuration.  AWS EKS, combined with Terraform, ensures you can deploy highly available Kubernetes clusters in a reliable and automated manner….

How to List All Tables in a Database

How to List All Tables in a Database

In database management, understanding how to list all the tables within a database is a fundamental skill. Whether you are a database administrator, developer, or data analyst, knowing which tables exist in your database is crucial for managing data effectively.  This article explores different methods to list all tables in a database across various database…

SQL Server VIEW ANY DEFINITION | Explained 

SQL Server VIEW ANY DEFINITION | Explained 

In SQL Server, permissions management is a critical aspect of maintaining database security and integrity. Among the various permissions available, the “VIEW ANY DEFINITION” permission plays a specific role, allowing users to access metadata about the database objects.  This article takes you into the details of this permission, its implications, and best practices for managing…

How to Drop NOT NULL Constraint in PostgreSQL

How to Drop NOT NULL Constraint in PostgreSQL

Removing a NOT NULL constraint from a column in PostgreSQL is a straightforward process that involves altering the table definition. This is commonly needed when a column’s data requirement changes, allowing for flexibility in data entry.  This article will guide you through the process of dropping a NOT NULL constraint in PostgreSQL. It’s pretty straightforward…

public key for pgdg-redhat-repo-latest.noarch.rpm is not installed | Solved

public key for pgdg-redhat-repo-latest.noarch.rpm is not installed | Solved

When working with RPM-based systems like Red Hat or CentOS, you might encounter an error stating that the “public key for pgdg-redhat-repo-latest.noarch.rpm is not installed.”  This issue arises when you try to install PostgreSQL or any other software from the PostgreSQL Global Development Group (PGDG) repository, and the system cannot verify the authenticity of the…