What is the recommended approach to handling database migrations during deployment?

What is the recommended approach to handling database migrations during deployment?

• A. Always perform migrations in production during peak hours.
• B. Prefer backward-compatible migrations, test in staging, minimize downtime, use replication or online migrations where possible.
• C. Migrations must be performed as the final step without testing.
• D. Disable backups during migrations.

Answer: (B)

Handle database migrations during deployment with compatibility and minimal downtime in mind. The best approach is to use backward-compatible migrations, validate them in a staging environment that mirrors production, and apply changes with online or replicated techniques whenever possible. Backward-compatible means adding changes that don’t break existing code—such as introducing new nullable columns or new tables, performing data migrations gradually, and avoiding destructive changes that older queries would fail to run until code is updated. Testing in staging helps you spot performance issues and data issues before they hit production. Using replication or online migration methods lets you apply schema changes with little or no service interruption and switch over only after the new schema is ready. Avoid peak-hour deployments, and ensure backups and rollback plans are in place, because skipping tests or backups raises the risk of outages or data loss.

Handle database migrations during deployment with compatibility and minimal downtime in mind. The best approach is to use backward-compatible migrations, validate them in a staging environment that mirrors production, and apply changes with online or replicated techniques whenever possible. Backward-compatible means adding changes that don’t break existing code—such as introducing new nullable columns or new tables, performing data migrations gradually, and avoiding destructive changes that older queries would fail to run until code is updated. Testing in staging helps you spot performance issues and data issues before they hit production. Using replication or online migration methods lets you apply schema changes with little or no service interruption and switch over only after the new schema is ready. Avoid peak-hour deployments, and ensure backups and rollback plans are in place, because skipping tests or backups raises the risk of outages or data loss.