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Database Architectures

Relational Databases (RDBMS)

• Core Properties: Enforces ACID (Atomicity, Consistency, Isolation, Durability). Guarantees immediate consistency; a transaction either fully completes or fully rolls back.
• Scalability Model: Primarily vertical (scaling up hardware like CPU, RAM). Horizontal scaling is difficult and expensive due to strict consistency requirements.
• Structure: Rigid, schema-based design. Data is stored in normalized tables with strict row/column constraints and foreign key relationships.
• Expanded Examples: Oracle DB, PostgreSQL, MySQL, Microsoft SQL Server, MariaDB.
• Target Use Cases: Banking, e-commerce checkout systems, ERP software, inventory management, or any domain where data integrity failure results in severe system or financial impact.

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3 Simple Software Principles: YAGNI, KISS, and DRY

Three useful software principles are YAGNI, KISS, and DRY.

YAGNI: You Aren’t Gonna Need It

Build only what you need right now. Don’t add features just because you might need them later.

public class User {

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#!/bin/bash

export TZ="Europe/Berlin"
export LANG="de_DE.UTF-8"
export LC_TIME="de_DE.UTF-8"

# Keep application/UI messages in English
export LC_MESSAGES="en_US.UTF-8"
export LANGUAGE="en_US:en"

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#!/usr/bin/env bash
set -euo pipefail

CLI_SETTINGS_DIR="$HOME/.gemini/antigravity-cli"
SETTINGS_FILE="$CLI_SETTINGS_DIR/settings.json"
HOOKS_DIR="$HOME/.gemini/hooks"
SCRIPT_FILE="$HOOKS_DIR/rtk-hook-agy.sh"

# Ensure jq is installed
if ! command -v jq >/dev/null 2>&1; then

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import os
import re
import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin

# Config
START_URL = "https://www.etsi.org/deliver/etsi_ts/"
DOWNLOAD_DIR = "./pdfs"
REQ_TIMEOUT = (10, 30)

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Arrow functions — simple comparison

ES5 (need .bind to keep this):

const result = {
  name: "Hello",
  data: function () {
    setTimeout(function () {
      console.log(this.name);
    }.bind(this), 5000);

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#!/usr/bin/env bash

set -e

# Configuration Variables
VM_NAME="VM1"
CPU_CORES="2"
RAM_SIZE="2048"       # VirtualBox requires RAM in MB
VRAM_SIZE="16"         # VRAM in MB
DISK_SIZE="20G"

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#include <stdio.h>

int main() {
    // 1. Declaring a Pointer
    int *ptr; // Pointer to an integer

    // 2. Assigning Address to a Pointer
    int var = 10;
    ptr = &var; // ptr now holds the address of var

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Version Specifications Documentation

When specifying versions for packages or modules, you may encounter various formats. Below are the details and examples to help you understand and apply the correct version specifiers.

---

General Form

Semantic Versioning Explained

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(function extractHrefsAsBashArray() {
    const domain = window.location;
    const links = document.querySelectorAll('body main.container div.list table.table tbody tr td a');
    const hrefsArray = Array.from(links).map(link => {
        const href = link.getAttribute('href');
        return href ? (href.startsWith('http') ? href : domain + href) : '';
    }).filter(href => href);
    console.log(`urls=(\n ${hrefsArray.map(href => `"${href}"`).join('\n ')}\n)`);
})();