Spanner supports the optimistic concurrency control mode. Optimistic concurrency control is suitable for transactional workloads with low

## Feature Feature Spanner supports the optimistic concurrency control mode. Optimistic concurrency control is suitable for transactional workloads with low read-write contention. It assumes that conflicts in transactions are rare. Reads and queries within a read-write transaction proceed without acquiring locks. For more information, see [Concurrency control](https://cloud.google.com/spanner/docs/concurrency-control).