connections and min-connections

These parameters control the maximum pool size and the minimum number of open connections to maintain.

See Backend Load Balancing for sizing and warm-pool behavior.

Error: Setting min-connections greater than connections is a hard configuration error.

server "primary" {
    url "mysql://radiator:secret@db.example.com:3306/radiator";
    connections 25;
    min-connections 2;
}

When every configured MySQL pool appears full, Radiator returns a pool-exhausted error instead of intentionally queueing behind a saturated pool.