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technologyreview.com·5d ago
AI Engineering
Lobsters·Jul 20·5 min read
Extending MVCC to be serializable, in TLA+ (2024)
TL;DR
Multi-version concurrency control (MVCC) typically achieves snapshot isolation but not serializability. This post explores extending MVCC to ensure serializability using TLA+, a formal specification language.
✦ Why It Matters
Implement this MVCC extension to ensure your database transactions are serializable and avoid potential data anomalies.
Key Takeaways
- Implement SSI to guarantee serializability in transactions.
- Track read and write operations to manage anti-dependencies.
- Use TLA+ for formal verification of transaction models.
- Abort problematic transactions to maintain execution integrity.
How It Works
The SSI model extends MVCC by adding bookkeeping for reads and tracking anti-dependencies. It identifies transactions that could create cycles in the dependency graph and aborts them to ensure serializability.