Parallel Migration
Parallel migration is a database migration strategy where both the old and new systems run simultaneously during the transition period, with data synchronized between them. This approach allows for gradual cutover and minimizes downtime by enabling users to switch to the new system incrementally while maintaining a fallback option. It is commonly used in large-scale system upgrades, database migrations, or when migrating to cloud platforms.
Developers should use parallel migration when migrating critical systems that require high availability and minimal disruption, such as financial systems, e-commerce platforms, or healthcare applications. This methodology reduces risk by allowing thorough testing of the new system in production-like conditions while the old system remains operational, and it enables rollback if issues arise. It is particularly valuable for complex migrations where data consistency and business continuity are paramount.