sql:

select p.spid,       a.serial#,       c.object_name,       b.session_id,       b.oracle_username,       b.os_user_name  from v$process p, v$session a, v$locked_object b, all_objects c where p.addr = a.paddr   and a.process = b.process   and c.object_id = b.object_id;