What is zero downtime migration?

This episode of Techsplainers explores zero downtime migration, the practice of moving databases, applications, or middleware to a new environment without interrupting the services that rely on them. It explains why this approach matters in sectors where even brief outages can mean lost revenue, broken service commitments, or compliance exposure. The episode walks through the core challenge of keeping source and target systems online, synchronized, and accurate at the same time. It covers common migration patterns such as change data capture, synchronized, and accurate at the same time. It covers common migration patterns such as change data capture, dual-write, expand-and-contract, blue-green deployment, and phased migration, showing how each balances speed, complexity, and risk differently. It also examines the operational demands behind successful migrations, including planning, backfilling, testing, synchronization, cutover, and post-migration monitoring. Along the way, listeners learn why zero downtime migration can improve user experience and business continuity, but also why it can introduce difficult troubleshooting, higher costs, and data integrity risks. The episode closes with a look at how AI is beginning to support migration workflows and where human oversight still remains essential. Find more information at https://www.ibm.com/think/insights/zero-downtime-migration Find more episodes: https://www.ibm.biz/techsplainers-podcast Narrated by Anna Gutowska