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SQLITE_E_PROTOCOL
SQLITE_E_PROTOCOL corresponds to SQLite SQLITE_PROTOCOL. Current SQLite documentation describes it as a rare WAL-mode race: two database connections try to start a transaction at the same time, one backs off and retries after a short delay.
What to check
- Confirm that the database is in WAL mode and measure how many independent connections begin write work concurrently.
- Keep write transactions short and serialize writes at the application layer when a high-contention workload makes the condition persistent.
- If the code repeats rather than disappearing after retry, check VFS and filesystem behavior and collect the SQLite version and extended error data.
PRAGMA journal_mode;
PRAGMA wal_checkpoint(PASSIVE);SQLite: Result and Error Codes
SQLite: File locking and concurrency
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