The original title is: "How execution plan analysis reduced a 12-second SQL query to 300ms"

Short summary

A developer reduced a 12-second SQL query to 300ms by analyzing the execution plan and addressing root causes: full table scans, inefficient joins, missing indexes, unnecessary columns, and expensive sorting. The article emphasizes measuring before optimizing and reading execution plans before rewriting queries. It briefly notes AI as a development companion but stresses engineering judgment remains essential.

• •Execution plan analysis revealed full table scans, missing indexes, and unnecessary column selection
• •Optimizations reduced query time from 12s to 300ms without hardware changes
• •Engineering judgment and evidence-based optimization remain critical even with AI assistance

Generated with AI, which can make mistakes.