我们这里一般用的PL/SQL,总是无意间把表锁住，所以我今天就整理了一下简单的解锁和查询锁表的方法；

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：

--以下几个为相关表
SELECT*FROMv$lock;
SELECT*FROMv$sqlarea;
SELECT*FROMv$session;
SELECT*FROMv$process;
SELECT*FROMv$locked_object;
SELECT*FROMall_objects;
SELECT*FROMv$session_wait;

--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;

--杀掉锁表进程

alter system kill session '68,51';--分别为SID和SERIAL#号

--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_TEXTFROM V$SESSION A, V$SQLTEXT CWHERE A.SID IN (SELECT DISTINCT T2.SIDFROM V$LOCKED_OBJECT T1, V$SESSION T2WHERE T1.SESSION_ID = T2.SID)AND A.SQL_ADDRESS = C.ADDRESS(+)ORDER BY C.PIECE;