一、首先PL/SQL要以管理员的账号（system/admin等）登录，管理员的账号和密码根据个人设置而来，连接为一般选择Normal,也可选择SYSDBA;
二、相关SQL语句：
（1）以下几个为相关表
SELECT*FROM v$lock;
SELECT*FROM v$sqlarea;
SELECT*FROM v$session;
SELECT*FROM v$process;
SELECT*FROM v$locked_object;
SELECT*FROM all_objects;
SELECT*FROM v$session_wait;
（2）查看被锁表信息
select sess.sid,
sess.serial#,
lo.oracle_username,
lo.os_user_name,
ao.object_name,
lo.locked_mode
from v$locked_object lo, dba_objects ao, v$session sess
where ao.object_id = lo.object_id
and lo.session_id = sess.sid;
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（3）杀掉锁表进程
alter system kill session '68,51'; --分别为SID和SERIAL#号
（4）查看数据库引起锁表的SQL语句
SELECT A.USERNAME,
A.MACHINE,
A.PROGRAM,
A.SID,
A.SERIAL#,
A.STATUS,
C.PIECE,
C.SQL_TEXT
FROM V$SESSION A, V$SQLTEXT C
WHERE A.SID IN (SELECT DISTINCT T2.SID
FROM V$LOCKED_OBJECT T1, V$SESSION T2
WHERE T1.SESSION_ID = T2.SID)
AND A.SQL_ADDRESS = C.ADDRESS(+)
ORDER BY C.PIECE;
