![]() ![]() Popular NoSQL databases are not built on a distributed storage engine and therefore avoid these distributed ACID transactions for fear of compromising performance (i.e. Shards are spread across nodes when the cluster is created in auto-sharded distributed databases like YugabyteDB, Google Cloud Spanner, and Azure Cosmos DB. Implementing distributed ACID transactions i n a scale-out database requires a transaction manager to coordinate the various operations and then commit/rollback the transaction as required. Distributed ACID transactions are transactions that impact a set of rows distributed across shards on multiple nodes distributed across a data center, region, or the world. ![]() Therefore, it is easier to implement in a distributed database. Since a single shard is always located inside a single node (or server), single-shard ACID doesn’t involve coordinating transaction operations across multiple nodes. Single-shard ACID occurs when all the rows involved in the transaction’s operations are located in a single shard of a distributed database.
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