If this property is set to the VirtualModeEnum.KeySet value, then the view initially fetches only a minimal set of columns for DataTables the view is based on. In the simplest case this minimal set consist solely of primary key columns. It can be expanded by columns referenced in view's sort and filter conditions. This approach minimizes the time necessary to perform initial fetching of data for a view. When the view row is later accessed by an application, the rest of the columns of the base DataRows that have not been fetched yet are fetched automatically.
