Setting this parameter to True causes records that contain an extended update_type column (type or bit 11) whose value is 2 (DELETE) to survive a reclone of the data set. Instead of dropping the table, all non-deleted records are removed from the table during the reclone.
To enable this you also need to have a NON-DMSII column enabled that stores the value and is called DELETED_RECORD.
This parameter has no effect on the handling of tables that have a non-DMSII column of type 10 (named deleted_record by default). Deleted records are unconditionally preserved when such tables are recloned.