How to Migrate an On-Premises Database to the Cloud Without Downtime

Migrating an on-premises database to the cloud involves navigating infrastructure, budget, and application uptime challenges simultaneously. Cloud-managed database services from providers like AWS, Google Cloud, and Azure offer built-in replication, automated failover, and point-in-time recovery, reducing operational burden significantly. However, skipping a pre-migration assessment — covering data volume, schema complexity, application dependencies, and compliance — is cited as the most common and costly mistake teams make. Schema incompatibilities, hardcoded IP addresses, and connection string updates across multiple applications can extend a two-day migration into weeks. Three main migration approaches exist — lift-and-shift, heterogeneous migration, and phased cutover — each carrying a distinct risk profile that organizations must evaluate before proceeding.