Changing a Snowflake virtual warehouse from Medium to Large increases the compute resources allocated to that warehouse—such as CPU cores, memory, and I/O bandwidth. This process is calledscaling up, or vertical scaling. It is typically performed to improve performance for complex queries, large joins, or computationally heavy workloads.
Scaling down is the reverse—reducing warehouse size from Large to Medium or similar.
Scaling out refers to adding more clusters to a multi-cluster warehouse, enabling increased concurrency rather than increasing power per cluster.
Scaling in is the reverse of scaling out—reducing the number of active clusters.
Thus, increasing the size from Medium to Large is vertical scaling, also known as scaling up.
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