Scaling with More Clusters:
This approach is ideal when you need to improve query concurrency—i.e., the ability to handle multiple queries simultaneously without significant performance degradation.
Scaling with a Higher Number of Nodes:
This is suitable when you find that the CPU utilization is consistently high, and queries are CPU-intensive. Adding more nodes spreads the workload across more computing units, thus alleviating CPU bottlenecks.
Scaling with Bigger Nodes:
This method is effective when the workload requires more memory or higher disk I/O capacity than what is currently available.