scaling

As applications grow, read operations often dominate database load. Directing reads to replica databases while keeping writes on the primary reduces contention and improves response times. Rails makes this straightforward with connects_to and role-bas

Database routers enable read-write splitting for scaling. I direct reads to replicas and writes to primary. The router examines hints and model to make routing decisions. For read-heavy apps, this distributes load across multiple databases. I use usin

Database routers direct queries to specific databases. I implement db_for_read(), db_for_write(), allow_relation(), and allow_migrate() methods. This enables read replicas, sharding by model, or separating analytics data. The router checks model label