Changed row count counts the rows in a dataset and stores the count in a variable called RowCountAll. For more information about Row Count Transformations, see Microsoft's MSDN article at Row Count Transformation.
To access the editor for Changed row count, double-click the Changed row count data flow component or highlight the component and click Show Advanced Editor.
The dataset is established by New and changed rows from OLTP. For more information, see New and Changed Rows from OLTP.