How does Rails handle large-scale multi-region data replication strategies?

Rails supports multi-region replication using asynchronous replication, read replicas, and conflict-aware systems.

Multi-region replication involves copying data across geographically distributed databases. Rails typically uses primary-replica setups with read scaling. In advanced systems, asynchronous replication or multi-master databases are used. Challenges include replication lag, conflict resolution, and data consistency trade-offs.