SELECT l.session_id sid, s.serial#, l.locked_mode,l.oracle_username,　　l.os_user_name,s.machine, s.terminal, o.object_name, s.logon_time　　FROM v$locked_object l, all_objects o, v$session s　　WHERE l.object_id = o.object_id　　AND l.session_id = s.sid    and oracle_username = ‘用户名‘   --用户名要大写　　ORDER BY sid, s.serial# 

ALTER system KILL session ‘SID,serial#‘