The Query That Ate 75% of Our Database CPU: A MySQL Full-Text Post-Mortem

<p>Hello, I'm Tuan.</p> <p>When backend engineers encounter a slow query, the first instinct is often something like:</p> <blockquote> <p>"Check the WHERE and ORDER BY, then just

<p><em>B-tree internals, column order and planner statistics in Postgres 19, checked against MongoDB's ESR rule.</em></p> <p>Most "add an index" advice stops at <code>CREATE

<p>If your app has a slow endpoint and you're staring at application logs trying to guess which query is the culprit, stop. Postgres already tracked every query it ran, how long

<p>PostgreSQL index design is often misunderstood.</p> <p>Many developers think that creating a good index simply means:</p> <blockquote> <p>“Create an index containing the

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