Answer: Increasing the MAX_CLUSTER_COUNT.

Horizontal scaling in Snowflake virtual warehouses refers to adding more compute nodes to handle increased workload, which is achieved by increasing the MAX_CLUSTER_COUNT parameter. This allows the warehouse to scale out across multiple clusters when needed. Option A (WAREHOUSE_SIZE) enables vertical scaling by increasing the size of individual nodes. Option C (MAX_CONCURRENCY_LEVEL) controls how many queries can run simultaneously but doesn't directly enable horizontal scaling. Option D (MIN_CLUSTER_COUNT) sets the minimum number of clusters but doesn't enable scaling out. The community discussion shows 100% consensus on option B, confirming this is the correct answer for horizontal scaling.

Author: LeetQuiz Editorial Team