DB2 Help

This check box indicates whether data is appended to the end of the table data or placed where free space is available in data pages.

Select the check box to have the table data appended. Information about the free space on pages will not be kept. The table must not have a clustered index.
Clear the check box to have the table data placed where there is available space. This is the default when a table is created.
If you clear the check box the table should be reorganized as information about available free space is not accurate and may result in poor performance during insert.