Parameter and Command Reference > Oracle Connector (CFS) Parameters > FetchTasks/TaskName Parameters > PrimaryKeys 

PrimaryKeys 
Use this parameter to specify what the primarykeys are in the table. This parameter is only used if you are calling the collect action on the connector. This would just be a column name or a CSV list of column names.
 
TaskName or FetchTasks
PrimaryKeys=ColumnName
PrimaryKeys=ColumnName1,ColumnName2