1、ORACLE中查看当前系统中锁表情况

select * from v$locked_object

2、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;

3、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#;

4、ORACLE解锁的方法

alter system kill session ’146′; –146为锁住的进程号，即spid