A standby node is a node that is set aside idling on hot standby.
The standby node will automatically replace the primary node when failure occurs.
Due to the memory requirements of replication, standby nodes are only supported for plans with 2GB of RAM or more.
Currently, MongoDB clusters can only have two standby nodes. Adding standby nodes is optional to cluster configuration and can affect the monthly cost.
Currently, MySQL clusters can only have two standby nodes. Adding standby nodes is optional to cluster configuration and can affect the monthly cost.
Currently, PostgreSQL clusters can only have two standby nodes. Adding standby nodes is optional to cluster configuration and can affect the monthly cost.
Currently, Redis clusters can only have two standby nodes. Adding standby nodes is optional to cluster configuration and can affect the monthly cost.