← Wednesday, October 14, 2026ArchitectureDeep dive
Cloudflare D1 scales its control plane for millions of small databases
D1’s architecture supports millions of databases, with hundreds of thousands active at a time, by scaling the control plane without routing every query through centralized bottlenecks. The patterns are relevant to engineers building multi-tenant platforms where per-user or per-environment databases are practical.
- What
- D1 is Cloudflare’s serverless SQLite database, designed to support platforms creating millions of small databases.
- How
- Its control-plane changes include globally distributed Workers KV for routing metadata and Hyperdrive for pooled, routed access to central Postgres.
- Why it matters
- Keeping centralized components off query hot paths matters when scaling multi-tenant systems without adding latency to every request.
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