{"schemaVersion":"1.0.0","id":"sqlite-at-the-edge","slug":"sqlite-at-the-edge","title":"SQLite at the edge, without the guesswork","description":"A query-first checklist for thinking clearly about D1, indexes, and where latency really comes from.","category":"Guides","tags":["SQLite","Cloudflare","Databases"],"date":"2026-09-29","updated":"2026-09-29","author":"PlainNerd editorial","readTime":3,"illustrationKind":"database","status":"published","evidenceStatus":"reference-guide","locale":"en","originalLocale":"en","content":{"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Reference guide. This article draws on primary documentation and editorial recommendations; no production measurements are reported."}]},{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Begin with the query"}]},{"type":"paragraph","content":[{"type":"text","text":"Before choosing an architecture, write down the reads and writes your application actually needs. A small editorial site might list published posts, fetch one slug, and append a comment. Those operations tell you more than a generic database comparison."}]},{"type":"paragraph","content":[{"type":"text","text":"Cloudflare D1 offers a managed serverless database with SQLite SQL semantics. That describes its interface; it does not tell you what your application’s end-to-end latency will be."}]},{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Inspect the plan"}]},{"type":"paragraph","content":[{"type":"text","text":"Use SQLite’s EXPLAIN QUERY PLAN to inspect index usage and scan strategy. Read it as a debugging aid: SQLite explicitly warns that its output format can change between releases. The example below assumes an articles table with slug, title, status, and published_at columns; adapt it to your own schema."}]},{"type":"codeBlock","attrs":{"language":"sql"},"content":[{"type":"text","text":"EXPLAIN QUERY PLAN\nSELECT slug, title\nFROM articles\nWHERE status = 'published'\nORDER BY published_at DESC\nLIMIT 20;"}]},{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Measure the whole request"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Use a representative dataset rather than an almost empty database."}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Measure application response time separately from database query time."}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Record client location, deployment configuration, cache state, and error rate."}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Review indexes against both read paths and write costs."}]}]}]},{"type":"paragraph","content":[{"type":"text","text":"Keep local correctness checks separate from remote performance observations. A fast local query cannot establish how a deployed request behaves."}]},{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Keep the first version legible"}]},{"type":"paragraph","content":[{"type":"text","text":"Choose explicit migrations, parameterized statements, and a documented recovery procedure. Before adding replication or caching, describe the consistency your readers need. This guide proposes a checklist; it contains no production performance measurements."}]},{"type":"paragraph","content":[{"type":"text","text":"Cloudflare: D1 overview","marks":[{"type":"link","attrs":{"href":"https://developers.cloudflare.com/d1/"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"SQLite: EXPLAIN QUERY PLAN","marks":[{"type":"link","attrs":{"href":"https://www.sqlite.org/eqp.html"}}]}]}]}}