data-migrations

Zero-downtime database migrations are achieved by applying the expand-contract pattern to separate schema changes into backward-compatible phases, allowing safe deployment without stopping production traffic.

The expand-contract pattern separates backward-compatible schema changes into expansion phases for adding new structures and contraction phases for removing deprecated ones, coordinating safe updates across SQL databases and DynamoDB.

Safely backfill data in production databases by using batched, idempotent scripts that process rows incrementally, paired with explicit rollback planning to prevent locking issues and ensure data integrity.

Yes, you can coordinate rolling back failing migrations by generating explicit rollback strategies during the planning phase, ensuring safe reversion for both SQL databases and DynamoDB schema changes.

Yes, this approach works for both SQL databases and DynamoDB by generating testable migration plans that enforce backward-compatible schema changes, batched backfills, and rollback strategies across different data stores.

To generate a safe, testable database migration plan, you need to provide your current database schema and the target schema changes you want to apply for your application update.