In this post, you’ll learn about the SQLite Error Message 15 SQLITE_PROTOCOL and the reason why you are receiving the error message when you are working with the SQLite database
How does this SQLite Error Message Look like?
15 – SQLITE_PROTOCOL
Why do you receive this Error in SQLite?
The SQLITE_PROTOCOL result code indicates a problem with the file locking protocol used by SQLite. The SQLITE_PROTOCOL error is currently only returned when using WAL mode and attempting to start a new transaction. There is a race condition that can occur when two separate database connections both try to start a transaction at the same time in WAL mode. The loser of the race backs off and tries again, after a brief delay. If the same connection loses the locking race dozens of times over a span of multiple seconds, it will eventually give up and return SQLITE_PROTOCOL. The SQLITE_PROTOCOL error should appear in practice very, very rarely, and only when there are many separate processes all competing intensely to write to the same database.