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Data Model Design Examples - Database Architecture

Discover data model design examples for relational and NoSQL databases. Normalisation, event sourcing and CQRS patterns.

The data model determines the scalability, performance and maintainability of your application. From 3NF normalisation for transactions to document models for flexibility — the right choice depends on your use case.

Normalised ER model for financial administration

An accounting firm had a data model designed with strict normalisation. Journal entries, ledger accounts and customers are linked via foreign keys with referential integrity.

  • 3NF for transaction integrity
  • Audit tables for history
  • Indexes on frequently used joins

Document model for configuration-based product catalogue

An e-commerce platform used MongoDB for products with variable attributes. Each product category had its own fields without schema migrations.

  • Embedded documents for variants
  • Denormalisation for read performance
  • Versioned documents for history

Key takeaways

  • Relational for ACID and complex joins; document for flexible schemas.
  • Denormalise only where reads far outnumber writes.
  • Migration strategies are crucial for schema changes.

How MG Software can help

MG Software designs data models that scale and remain maintainable. From relational to event-sourced — we choose the right model.

Further reading

ExamplesData Migration Examples - Safe Transitions to New SystemsAPI Integration Examples - Practical Integrations for BusinessesDatabase Design Template - Free Download & ExampleWhat is Database Design? - Definition & Meaning

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Frequently asked questions

PostgreSQL for transactions, relations and reporting. MongoDB for very flexible schemas and document-like data.
Backward-compatible migrations, feature flags and gradual rollout. Blue-green or canary where possible.

PostgreSQL or MongoDB for a new project?

PostgreSQL for transactions, relations and reporting. MongoDB for very flexible schemas and document-like data.

How do I migrate a data model safely?

Backward-compatible migrations, feature flags and gradual rollout. Blue-green or canary where possible.

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Database Design Template - Free Download & Example

Download our free database design template. Includes ERD schema, normalisation checklist, indexing strategy and data dictionary. Suitable for relational databases.

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Data Migration Examples - Safe Transitions to New Systems

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