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.
Real developers can help you.
Matthew Jordan
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Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
Alvin Voo
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prajwalfullstack
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BurnHavoc
Been around fixing other peoples code for 20 years.
hanson1014
Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
Prakash Prajapati
I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
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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