Simon Willison’s Weblog

19th August 2009 - Link Blog

How to find un-indexed queries in MySQL, without using the log (via) Use tcpdump(!) to sniff the MySQL protocol and dump out queries that had the “no index used” bit set.

Posted 19th August 2009 at 11:42 am

Recent articles

Notes on the xAI/Anthropic data center deal - 7th May 2026
Live blog: Code w/ Claude 2026 - 6th May 2026
Vibe coding and agentic engineering are getting closer than I'd like - 6th May 2026

This is a link post by Simon Willison, posted on 19th August 2009.

mysql 81 profiling 13 tcpdump 1

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe