1.查询引起了锁表的原因

select l.session_id sid,
       s.serial#,
       l.locked_mode,
       l.oracle_username,
       s.user#,
       l.os_user_name,
       s.machine,
       s.terminal,
       a.sql_text,
       a.action
  from v$sqlarea a, v$session s, v$locked_object l
  where l.session_id = s.sid
  and s.prev_sql_addr = a.address
  order by sid, s.serial#;

2.查询被锁的表

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

3.查看是哪个session引起的

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

4.杀掉对应进程即解锁

--其中99是sid 178是serial#
alter system kill session '99,178'