Under which condition will a multi-cluster warehouse start a new cluster when using the economy scaling policy?

• A. Only if the system estimates there's enough query load to keep the cluster busy for at least 6 minutes.
• B. Only if the system estimates there's enough query load to keep the cluster busy for at least 2 minutes.
• C. Only if the system estimates there's enough query load to keep the cluster busy for at least 15 minutes.
• D. The policy is always on; no threshold.

Answer: (A)

Economy scaling makes scaling decisions based on estimated workload. It will add a new cluster only when the forecasted query load is enough to keep that extra cluster busy for a minimum period, so the scaling is cost-effective and not triggered by short spikes. The threshold used here is 6 minutes, meaning a new cluster is started only if the workload estimate suggests it would be utilized for at least about 6 minutes. It won’t spin up for shorter, transient bursts, and it’s not always-on without a threshold.