Why should migration scripts be tested in staging before production?

• A. To speed up production deployment
• B. To test in staging, ensure reversibility, and verify script safety
• C. To avoid versioning
• D. To skip code review

Answer: (B)

Testing migration scripts in a staging environment before production is essential because it verifies that schema changes and data migrations behave safely in a production-like setting. In staging you approximate real data, workloads, constraints, and index usage, so you can confirm the migration completes without errors, preserves data integrity, and doesn’t introduce performance or locking issues. It also lets you practice and validate the rollback or undo path, ensuring you can revert cleanly if something goes wrong, and it gives the team a chance to confirm that the application continues to function after the change. This upfront validation catches edge cases you might miss in development, where the data and scale are far smaller. It’s about safety and reliability, not just speed, versioning, or bypassing important review processes.