Claude Code
database
Database Deadlock in Concurrent Updates
Application encounters deadlock errors intermittently when multiple users perform operations simultaneously. Specific sequences of operations cause deadlock: Thread A waits for lock held by Thread B, which waits for lock held by Thread A. Application must retry deadlocked operations.
Deadlocks are hard to reproduce but fail under load testing or in production.
Error Messages You Might See
Deadlock found when trying to get lock
Transaction was rolled back due to deadlock
Continuous deadlock retries
Common Causes
- Transactions acquire locks in different order (A locks table1 then table2, B locks table2 then table1)
- Long-running transactions holding locks too long
- Missing indexes causing full table scans and excessive row locks
- Row-level locks held while waiting for other operations
- No deadlock retry logic in application
How to Fix It
Always acquire locks in same order across application. Use consistent transaction isolation level. Keep transactions short. Add indexes to reduce lock contention. Implement deadlock retry: catch deadlock exception, wait briefly, retry. Check database: SHOW PROCESSLIST shows locks held. Configure deadlock victim: database kills one transaction to resolve.
Real developers can help you.
Nam Tran
10 years as fullstack developer
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
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Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
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rayush33
JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
AUXLE
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Alvin Voo
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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.
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Developer with 8 years of experience building softwares fro startups
David Olverson
Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production.
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Full stack dev w/ 20+ years of experience
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How to prevent deadlocks?
Always acquire locks in same order. If A acquires table1 then table2, B must too (never table2 then table1).
How to detect deadlock cause?
Enable deadlock logging: innodb_print_all_deadlocks = ON (MySQL). Logs show which queries caused it and lock order.
Should deadlocks be retried?
Yes. Deadlocks are normal under load. Catch DeadlockException, wait briefly (exponential backoff), retry. Usually succeeds on second try.