Database Migration Strategies for .NET Applications

Database migration is often the most challenging aspect of .NET modernization projects. Here are proven strategies that minimize risk while ensuring data integrity.

The Strangler Pattern

Gradually replace legacy database access with modern implementations. This allows you to modernize incrementally without disrupting production systems.

Blue-Green Deployment

Maintain two parallel environments (blue and green). Route traffic to the new environment only after thorough validation. If issues arise, instantly roll back to the original.

Phased Migration

Break the database into logical domains and migrate them independently. This reduces the scope of each migration phase and allows for faster rollbacks if needed.

Data Sync Strategies

Use tools like AWS Database Migration Service or Azure Data Factory to keep legacy and modern databases in sync during the transition period. This eliminates the need for a risky "big bang" cutover.

Schema Modernization

Don't just lift-and-shift the old schema. Take the opportunity to normalize data models, add proper indexing, and optimize for modern query patterns.

Testing and Validation

Implement comprehensive data validation checks before, during, and after migration. Automated testing should verify data integrity at every step.