https://jamiecraane.dev/tags/tooling/ Recent content in Tooling on Jamie Craane personal blog Hugo en-us Thu, 11 Jun 2026 00:00:00 +0000 https://jamiecraane.dev/2026/11/06/analyzing-log-data/ Thu, 11 Jun 2026 00:00:00 +0000 https://jamiecraane.dev/2026/11/06/analyzing-log-data/ <h3 id="introduction">Introduction</h3> <p>A production system feels sluggish, you suspect the database, and you have a log file full of slow query entries staring back at you. The data you need is right there. The hard part is turning a few thousand lines of text into answers.</p> <p>Recently I had exactly this situation: a log file from production containing slow database queries, and four questions:</p> <ul> <li><strong>Which queries are slow?</strong></li> <li><strong>What is the distribution of the execution time?</strong></li> <li><strong>When are the queries slow?</strong></li> <li><strong>What are the most frequently executed queries?</strong></li> </ul> <p>These are the bread-and-butter questions of database performance work. And yet, answering them well is surprisingly awkward with the tools we usually reach for.</p>