0 - 2 of 2 tags for responding state

Hi All,
       I have faced a scenario recently where the DELETE statements are going into RESPONDING state. I am aware that the sessions which run SELECT will be going into the RESPONDING state if the result is being written into a file. 
I have tried to find the root cause. But couldnt find. Please help me out with this.

I am loading data thru informatica to teradata in relational mode. i.e. the queries are are simple 'insert' and 'update' statements. All the requests are tied in BT-ET transaction mode for 10 second interval.