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Diagnose Slow MySQL Queries with EXPLAIN, Indexes and the Slow Log

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Self-Hosting & Infra intermediate 8 min read $0.01 Updated 2026-10-19

Practical MySQL and MariaDB query tuning: enabling the slow query log, EXPLAIN and EXPLAIN ANALYZE, access types, composite index column order, covering indexes, functions on indexed columns, implicit conversions, OFFSET pagination and connection limits.

A MySQL query takes seconds. Find it in the slow log, read EXPLAIN for full scans and filesorts, add the right composite index, and avoid the patterns that make indexes unusable.

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#mysql#mariadb#indexes#explain#performance

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