Archive

Everything published here, newest first. Corrections go at the bottom of each note.

• 18 Nov 2025 — Why our p99 was exactly 100 ms
• 02 Oct 2025 — Connection pools are a queueing problem
• 21 Aug 2025 — Reading an MTU problem from the packet trace
• 14 Jun 2025 — A backup you have never restored is a rumour
• 09 Mar 2025 — Log lines worth writing at three in the morning
• 27 Jan 2025 — Index-only scans and the columns you forgot