planning-migration-strategy

Plan a database schema migration by defining compatibility between old and new versions, breaking the transition into phased rollout stages, and establishing post-migration verification steps to ensure zero data loss.

The expand and contract pattern is a data migration strategy that allows different schema versions to coexist. It expands the schema to support both old and new structures, migrates the data, and then contracts by removing the old structure.

You need a dual-write strategy for database upgrades when you must maintain data integrity across legacy and new schemas simultaneously during a phased rollout, ensuring both systems stay synchronized until the transition completes.

Ensure data integrity during API versioning by planning compatibility for evolving contracts, selecting appropriate migration patterns like dual-write, and defining clear verification steps to validate data consistency post-migration.

The best way to migrate a legacy database safely is using a phased execution strategy that identifies migration objects, ensures backward compatibility, and includes verification methods to confirm data integrity throughout the transition.