i wanted to know how i can maintain transaction with mongo. as when i try to insert into collection so if something went wrong this that transaction how can i rollback .

eg :
suppose i have 23 records and when i insert i added data with _id as 100 then data is added successfully but as i m using sequence _id should be 24 but what if i insert some other no.
so now i want to rollback whatever i have inserted .