Tuning for Refresh
When a refresh operation is running, system performance is affected and user queries are rejected. You want to reduce the memory usage of the refresh job.
Set MEMORYSIZE in the REFRESH pool to a fixed value. The Resource Manager then tunes the refresh query to only use this amount of memory.
Remember to reset MEMORYSIZE in the REFRESH pool to 0% after the refresh operation completes, so memory can be used for other operations.