Select Partitions to Modify (Usage-Based Optimization Wizard)

Use the Select Partitions to Modify page to select the partitions for which you want to design aggregations.

Options

(Select)
Select the check box in the column heading to design aggregations for all partitions in the measure group.

Select the check box for a partition to design aggregations for just the selected partition.
Partition Name
Displays the name of the partition.
Source
Displays the table or query used to provide source data for the partition.
Aggregation Designs
Displays a string that describes the aggregation design used by the partition.