https://precomputing.com/tags/file-format/ Recent content in File Format on Precomputing.com Hugo en-us Fri, 25 Sep 2026 00:00:00 +0000 https://precomputing.com/one-file-the-sqlite-layout-both-runtimes-write/ Fri, 25 Sep 2026 00:00:00 +0000 https://precomputing.com/one-file-the-sqlite-layout-both-runtimes-write/ <p>A Precomputing file is an ordinary SQLite file. Any SQLite tool opens it, the same SQL works on it whichever runtime wrote it, and it carries its own policy, so a reader never has to guess what is inside. This post walks through the layout for one stream.</p> <h2 id="what-is-in-the-file">What Is in the File</h2> <p>For Demo 1&rsquo;s stream, <code>latency</code>, with the key <code>endpoint</code> and the value <code>ms</code>:</p> <p><img src="https://precomputing.com/images/file-layout.png" alt="The file for the latency stream. You insert into the view latency and read the answer views requests, avg_ms and p99_ms. Behind them sit latency_raw with whole events, latency_win with one summary per window and key, latency_ms_sk with sketch buckets, latency_sample, latency_anomaly and latency_base, the state tables behind the answers, and three tables that describe the file: _precomputing with the policy, _precomputing_objects and, when the Engine writes, _precomputing_sources."></p>