先查询什么东西锁了，下面两个SQL都可以
select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
然后打开PL/SQL的工具→会话
把上面查到的SID同样的会话关了就行了