Scaling Database Availability Without Disruptio

This post details SingleStore's Online AZ Migration capability, which allows reconfiguring a running deployment between single-AZ and multi-AZ operation without taking applications offline. It explains how this is achieved through distributed SQL, where ownership is distributed across partitions rather than individual servers. The post contrasts this with traditional databases that require disruptive migrations. It highlights leaf fanout failover at the partition level and describes the process of provisioning new nodes, redistributing partitions, and updating placement policies online. The benefit for enterprise customers is the ability to evolve availability requirements without costly and risky migration projects.