🔒 Paid
Database Lock Contention
A scheduled batch job has started updating rows on a hot table, and its long-held locks are blocking normal transactional writes behind it. Blocked transactions are piling up, query latency is climbing, and some transactions are starting to time out. Diagnose the contention and restore healthy write throughput before the backlog cascades into a full outage.
- Difficulty
- Senior
- Expected Time
- ~14 min
- Category
- Databases & Storage
Skills
- Diagnosing lock contention and blocked transactions
- Batch job chunking and concurrency tuning
- Lock timeout tradeoffs under contention
- Recognizing plausible-but-harmful mitigations
System Architecture
- API Service
- Primary Database
- Batch Job Worker
- Transaction Queue
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