ORACLE中查看当前系统中锁表情况 及处理方法

1. ORACLE中查看当前系统中锁表情况
select * from v$locked_object 
可以通过查询v$locked_object拿到sid和objectid，然后用sid和v$session链表查询是哪里锁的表，用v$session中的objectid字段和dba_objects的id字段关联，查询详细的锁表情况。

查询SQL如下：
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, v$process p
where ao.object_id = lo.object_id
   and lo.session_id = sess.sid;

查询是什么SQL引起了锁表的原因，SQL如下：
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. ORACLE解锁的方法
alter system kill session ’146′;  –146为锁住的进程号，即spid

select 'alter system kill session ' || '''' || t2.sid || ','|| t2.serial# || '''' ||';' , t2.username,t2.sid,t2.serial#,t2.logon_time from v$locked_object t1,V$session t2 where t1.SESSION_ID=t2.SID;