PostgreSQL Query Rewriting Techniques The previous articles in this series covered performance problems you fix by adding indexes, restructuring joins, or tuning memory. This one is about the queries where the plan is "fine" — every node is doing something reasonable — but the query itself is asking the wrong question, producing unnecessarily large intermediate results or forcing the planner dow
Visual Studio Code
This section is the map for the rest of the book. The five stages introduced in the 1.1 chapter overview (parse, analyze/rewrite, plan, portal, execute) are traced here through the actual code: which functions implement each stage, and in what order they get called. The mechanics of each of the five stages are unpacked in later chapters. Here, only the skeleton matters: how a backend starts up, ho
PostgreSQL Internals · Chapter 1 Query Processing Suppose a client sends SELECT * FROM users WHERE id = 1. The path that single line travels before coming back as a result row is longer than you might expect. Inside the PostgreSQL backend, that SQL goes through a five-stage pipeline. Backend entry and dispatch. The backend receives the message from the client and decides which processing path it s
Microsoft’s AI-102: Designing and Implementing a Microsoft Azure AI Solution exam is designed for Azure AI engineers who build, deploy, secure, and manage AI solutions using Azure AI services, Azure AI Search, Azure OpenAI, computer vision, natural language processing, knowledge mining, and generative AI capabilities. The exam is proctored, has a listed duration of 100 minutes, and measures practi
A step-by-step guide for beginners who want a gaming PC and a real enterprise Linux environment on the same machine — with every decision explained in plain English. What Is Dual-Booting and Why Rocky Linux? UEFI, BIOS, and Secure Boot Partitions, File Systems, and GPT The GRUB Bootloader Before You Begin — Checklist Phase 1 — Shrink Your Windows Partition Phase 2 — Download & Flash Rocky Linux Ph
SQL is widely known for data querying and manipulation but systems do grow; data becomes larger; processes become repetitive and operations become sensitive. SQL has some features which enables it to be considered a fully fledged programming language. Some of the features which I discuss in this article are procedures, functions and transactions. Each of these concepts serve distinct purposes. Sto
Introduction Placing RDS in a private subnet protects it from unauthorized external access — but it also means you can no longer connect directly from your developer machine. This article walks you through a step-by-step guide to securely connect to a private-subnet RDS (PostgreSQL) instance using AWS Client VPN. Developer PC │ │ UDP 443 (TLS / Mutual Certificate Authentication) ▼ Client