Research confirms SQLite's WAL mode works reliably across Docker containers sharing a volume on the same host, with real-time database change propagation and effective shared memory mapping. The experiment demonstrates that containers on the same filesystem properly share WAL shared memory (.db-shm) without conflicts. This addresses common concerns about SQLite concurrency in containerized environments.
Background
SQLite's WAL (Write-Ahead Logging) mode is a popular feature that improves concurrency, but there have been questions about its behavior in containerized environments where multiple processes might access the same database file.
- Source
- Simon Willison
- Published
- Apr 7, 2026 at 11:41 PM
- Score
- 6.0 / 10