db-transaction-design
DB Transaction Design
Overview
Use this skill to design transaction behavior that protects invariants while avoiding avoidable contention and deadlocks.
Scope Boundaries
- Concurrent workflows must preserve business invariants.
- Anomalies (lost update, write skew, phantom) are possible.
- Lock contention or deadlocks are degrading reliability.
Core Judgments
- Transaction boundary: what must be atomic versus eventually consistent.
- Isolation level per workflow and anomaly tolerance.
- Locking strategy: optimistic, pessimistic, or hybrid.
- Retry/idempotency behavior under deadlock/timeouts.
Practitioner Heuristics
- Keep transactions as short as possible while preserving invariants.
- Choose isolation by anomaly risk, not blanket highest level.
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