Introduction to EXPLAIN and ANALYZE

Welcome to the world of PostgreSQL query optimization! To make your database run fast, you need to understand how it processes your requests.

This lesson introduces you to EXPLAIN, a powerful command that lets you peek behind the scenes and see exactly how PostgreSQL plans to execute your SQL queries.

Before a database executes your SQL query, it first goes through a crucial step: query planning. PostgreSQL has a built-in component called the query optimizer.

Think of the optimizer as a super-smart chef. When you give it a recipe (your SQL query), it figures out the most efficient way to prepare the dish (fetch your data). This involves choosing the best steps, like which indexes to use or how to join tables.