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In modern system design, proxy servers play a crucial role in improving performance, enhancing security, and ensuring scalability. A proxy acts as an intermediary between a client and the destination server, enabling features like load balancing, caching, anonymity, and more. Types of Proxies 1. Forward Proxy   Position: Between the client and the internet. Function: Handles requests from clients and forwards them to the appropriate server . Use Cases: Hiding client IP addresses for privacy Caching frequently accessed content Filtering requests (e.g., blocking restricted websites) How to use: Configure client to use proxy for outbound traffic. Use squid (recommended) - traditionally used as a forward proxy (and sometimes transparent proxy). It was built for caching web content and controlling outbound traffic. Script: # squid.conf http_port 3128 acl allowed_clients src 192.168.1.0/24 http_access allow allowed_clients # Optional: block certain domains acl blocked_sites dstdomain .fa...

Data Partitioning Techniques: Making Databases Scale Better As applications grow and data explodes, databases can become bottlenecks. Queries slow down, servers get overloaded, and scaling becomes a nightmare. That’s where data partitioning comes in - a smart way to split your data into manageable chunks so your system stays fast, efficient, and scalable. The most common partitioning techniques with simple examples and their benefits: 1. Horizontal Partitioning (Sharding) Description: Splitting data across multiple tables or databases based on rows. Example 1 : You run a global app with millions of users. Instead of storing all user data in one giant table, you split it by region - Asia, Europe, and America. Each shard handles users from its region, reducing load and speeding up queries. Example 2 (Layman) : Think of a library with millions of books. Instead of keeping them all in one giant hall, you split them into different buildings by genre - fiction, science, history. Each buildin...

In software engineering, design patterns are tried‑and‑tested solutions to recurring problems in system design. They provide a shared vocabulary for developers and help create flexible, maintainable, and scalable applications. Broadly, design patterns fall into three categories: Creational, Structural, and Behavioral. In brief, Design Patterns are Reusable Solutions for Common Software Problems. Creational Patterns Creational patterns deal with object creation mechanisms , making systems more independent of how their objects are created.          1.  Singleton   Ensures a class has only one instance and provides a global point of access to it. Example: Logger, configuration settings.                        ```                      // Ensures only one instance of a class exists. // Useful for shared resources like l...