Answer: Reduce queuing., Increase the warehouse size.

The question asks for two strategies to optimize virtual warehouse performance. Based on the community discussion and Snowflake documentation, options A and D are correct. A (Reduce queuing) improves performance by minimizing wait times for query execution, which can be achieved through multi-cluster warehouses or additional warehouses. D (Increase the warehouse size) directly enhances compute resources, reducing query execution time and handling larger workloads. Option B (Allow memory spillage) is incorrect as it degrades performance by forcing disk usage instead of memory. Option C (Increase MAX_CONCURRENCY_LEVEL) is incorrect because increasing concurrency can lead to resource contention and queues, whereas decreasing it is recommended for optimization. Option E (Suspend the warehouse frequently) is incorrect as frequent suspension disrupts cache retention and increases cold-start latency.

Author: LeetQuiz Editorial Team