Partitioning Element (DTA)
Contains the partitioning scheme that you would like Database Engine Tuning Advisor to use during analysis.
Data type and length
string, no maximum length.
Use only one of these values with this element.
ALIGNED means that in the recommendation generated by Database Engine Tuning Advisor every proposed index is partitioned in exactly the same way as the underlying table for which the index is defined. Nonclustered indexes on an indexed view are aligned with the indexed view.
Required once for the TuningOptions element, unless the DropOnlyMode element is used. If DropOnlyMode is used, you cannot use Partitioning. These elements are mutually exclusive.