Answer: Standard scaling policy

The question asks about the concurrency policy setting where a multi-cluster virtual warehouse immediately starts an additional compute cluster when queries begin to queue. According to Snowflake documentation and the community discussion, the Standard scaling policy (option D) is designed to prevent or minimize queuing by favoring starting additional clusters over conserving credits. This aligns with the requirement for immediate cluster scaling upon queuing. The community discussion shows strong consensus (88% selected D) with upvoted comments confirming D as correct and referencing official documentation. Option A (Auto-scale mode) is a prerequisite but not the specific policy; option B (Maximized mode) uses a fixed number of clusters and doesn't scale; option C (Economy scaling policy) prioritizes credit conservation over immediate scaling, making it less suitable.

Author: LeetQuiz Editorial Team