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Use a traditional database when a single organization controls the data, performance is critical, data needs frequent updates, and cost efficiency is paramount. Use blockchain when multiple untrusting parties must share a record, immutability is required, smart contract automation adds value, or asset ownership/tokenization is involved.
When a Traditional Database Is Correct
- A single organization controls the data (no need for decentralized trust)
- Data must be updated or deleted efficiently (customer records, inventory)
- Query performance is critical (complex analytics across millions of records)
- Privacy is paramount (data should not be publicly readable)
- Cost must be minimized (databases are 100–1,000× cheaper per transaction)
A traditional database is faster, cheaper, more flexible, and better supported than any blockchain for single-organization, trusted, high-performance data management. If your question is "should I store my customer records on blockchain," the answer is no.
When Blockchain Is Correct
- Multiple organizations must share a single trusted record without trusting each other (supply chain with 8 competitors, financial settlement between counterparties)
- The history of a record must be immutable and auditable by any participant (regulatory compliance, audit trail, title records)
- Smart contract automation is required (payment releases on conditions, token issuance, governance voting)
- Censorship resistance is required (no single party can delete or modify the record)
- Asset ownership must be transferable without an intermediary
The Decision Test (5 Questions)
- 1. Do multiple untrusting parties need to share and update the same data? If no: database.
- 2. Is an immutable audit trail legally or operationally required? If no: database.
- 3. Do you need smart contract automation on the data? If no: database.
- 4. Is asset ownership or token issuance involved? If no: database (unless you answered yes to 1 or 2).
- 5. Does censorship resistance matter for your use case? If no: database.
If you answered yes to any of questions 1–4: evaluate blockchain seriously.
Cost Comparison
| Factor | Database | Blockchain |
|---|---|---|
Per-transaction cost | $0.000001–$0.001 | $0.01–$50 (chain-dependent) |
Read performance | 10,000–100,000 QPS | 100–10,000 QPS (via indexer) |
Write performance | 1,000–50,000 TPS | 15–65,000 TPS (chain-dependent) |
Development cost | Baseline | 3–10× higher |
Operational cost | Low | Moderate–High |
Audit trail | Requires logging design | Built-in |
Multi-party trust | Requires centralized authority | Built-in |