Data Migration Strategies: Zero-Downtime Patterns, CDC, Dual Writes, and Proving Correctness
A practical guide to production data migration strategies—big-bang vs online migrations, expand/contract, dual writes, CDC, validation, cutover, and rollback. Includes runnable code, mermaid diagrams, and trade-offs commonly tested in system design interviews.
Data Migration Strategies
Techniques for migrating data between different schemas and systems