During the copy step, the space management properties for the table are used as follows:
If an expected row size value is specified for the table, and the locking scheme is being changed from allpages locking to data-only locking, the expected row size is applied to the data rows as they are copied.
If no expected row size is set, but there is a max_rows_per_page value for the table, an expected row size is computed, and that value is used.
Otherwise, the default value specified with the configuration parameter default exp_row_size percent is used for each page allocated for the table.
The reservepagegap is applied as extents are allocated to the table.
If sp_chgattribute has been used to save a fillfactor value for the table, it is applied to the new data pages as the rows are copied.