a quesiton about commit

 our customer ask a quesiton .

they open a session . and did some job , (such as load data with insert ), and last they forget commit, and exit the session, (does this data load work is  be of no effect).

and they reopen a new session , and did  commit,  they want to kown does this commit is can resume commit the last session, or need to redo the  load data with insert  again , and commit again!