Why SELECT * Slows Down MySQL: Deep Dive into Indexes and Optimization

This article explains why using SELECT * in MySQL queries hurts performance, explores the underlying reasons such as extra data transfer, I/O overhead, and loss of covering index optimization, and provides practical guidance on index usage and best practices.

Database PerformanceIndex OptimizationSELECT *

0 likes · 10 min read

Why SELECT * Slows Down MySQL: Deep Dive into Indexes and Optimization

Architecture Digest

Jun 28, 2020 · Databases

Why Using SELECT * Is Inefficient in MySQL and How Indexes Improve Performance

This article explains the hidden costs of using SELECT * in MySQL, detailing how unnecessary columns increase parsing, network, and I/O overhead, and shows how proper column selection and composite indexes enable covering indexes for significantly faster query execution.

SELECT *SQL Optimizationindexes

0 likes · 9 min read

Why Using SELECT * Is Inefficient in MySQL and How Indexes Improve Performance