When this option is set to NONE, there is no a global variable for counting the total number of records have been inserted, updated, or deleted.
When delete item is choosen, there will be a global variale such as ((Integer)globalMap.get("tOracleOutput_1_NB_LINE_DELETED")) will be avaible, which counts the total number of records have been deleted.
I got the solution,thanks to cterenzi.
1,I just compared the source and target using a tMap lookup.Checked the option for Inner Join,
2,SET the 'catch lookup Inner Join Reject' to: 'True' for Target in tMap.
3.Performed a Deletion Job on this Mapping