Spanner is a scalable, globally-distributed database designed, built, and deployed at Google. 💾

Spanner is a scalable, globally-distributed database designed, built, and deployed at Google. 💾

At the highest level of abstraction, it is a database that shards data across many sets of state machines in data centers spread all over the world. 🌎

Replication is used for global availability and geographic locality; clients automatically failover between replicas. Spanner automatically reshards data across machines as the amount of data or the number of servers changes, and it automatically migrates data across machines (even across datacenters) to balance load and in response to failures. ⚠️

Spanner is designed to scale up to millions of machines across hundreds of data centers and trillions of database rows.

Spanner supports general-purpose transactions, and provides a SQL-based query language.

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