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This article dives into the hidden failures that crop up when your database leaves the ideal “happy path.” It covers contention, slow queries, race conditions, stale reads, retries and live migrations, and shows how production realities can break simple transactional code.
- A slow query isn't just "slow" — threads sitting idle in transactions hold locks and connections until the pool fills up and unrelated requests start timing out.
- Client-side timeouts and retries can pile new connections onto a backlog while the original transaction still commits, causing duplicate orders or inconsistent stock.
- Concurrent "check stock" calls can each see available inventory and decrement it in parallel, leading to overselling.
- Replica lag and mixed old/new code during schema migrations can silently feed stale reads or trigger deadlocks in production.