Replit
database
SQLite Database Locked on Replit
SQLite database is locked and transactions timeout. Multiple processes are trying to write simultaneously, causing lock contention.
SQLite isn't designed for concurrent writes like PostgreSQL, making it unsuitable for Replit's multi-process environment.
Error Messages You Might See
database is locked
Database file is locked
Timeout waiting for database lock
SQLite error 5: database is locked
Common Causes
- Multiple Replit instances writing to same SQLite file simultaneously
- Long-running transactions holding locks
- WAL mode not enabled for SQLite
- Timeout set too low for concurrent operations
- SQLite used instead of proper database like PostgreSQL
How to Fix It
Switch to PostgreSQL (Replit's built-in option) for production. If you must use SQLite, enable WAL mode and increase transaction timeout. Ensure only one process writes to SQLite at a time. Avoid SQLite entirely for deployed Replit apps.
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Victor Denisov
Developer
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Get HelpFrequently Asked Questions
Why is SQLite bad for Replit?
SQLite can't handle multiple concurrent writers. Replit deployments scale to multiple instances, causing lock contention
Should I enable WAL mode?
WAL helps but doesn't solve the underlying concurrency issue. Use PostgreSQL instead