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Spanner is a relational database with 99.999% availability which is roughly 5 mins a year. Spanner is a distributed system and can span multiple machines, multiple datacenters (and even geographical regions when configured). It splits the records automatically among its replicas and provides automatic failover. Unlike traditional failover models, Spanner doesn’t failover to a secondary cluster but can elect an available read-write replica as the new leader. In relational databases, providing bot...