How does Rails handle large-scale multi-region active-active database architectures?

Rails supports multi-region active-active setups through read/write splitting, conflict resolution strategies, and eventually consistent replication systems.

In active-active architectures, multiple regions accept reads and writes simultaneously. Rails itself does not enforce consistency but integrates with databases like CockroachDB or distributed PostgreSQL setups. The major challenge is conflict resolution when the same record is updated in multiple regions. Strategies include last-write-wins, vector clocks, or application-level reconciliation. Rails typically implements read/write routing using connected_to while external systems handle replication consistency.