汇总了部分查看锁信息的方法，供参考。

如何快捷的显示当前锁定和被锁定表的用户，sql等信息
如果是dba用户那么可以使用
一、
阻塞和等待的用户及sql语句
select 'blocker('||wb.holding_session||':'||sb.username||')-sql:'||qb.sql_text blockers,sb.machine,sb.terminal,
'waiter ('||wb.waiting_session||':'||sw.username||')-sql:'||qw.sql_text waiters ,sw.machine,sb.terminal
from dba_waiters wb,
v$session sb,
v$session sw,
v$sqlarea qb,
v$sqlarea qw
where wb.holding_session=sb.sid
and wb.waiting_session=sw.sid
and sb.prev_sql_addr=qb.address
and sw.sql_address=qw.address
and wb.mode_held<>'None'

二、如果不是dba那么就不能使用dba_waiters表了，可以使用v$lock来替换

select 'blocker('||lb.sid||':'||sb.username||')-sql:'|| qb.sql_text blockers,
'waiter ('||lw.sid||':'||sw.username||')-sql:'|| qw.sql_text waiters
from v$lock lb,
v$lock lw,
v$session sb,
v$session sw,
v$sql qb,
v$sql qw
where lb.sid=sb.sid
and lw.sid=sw.sid
and sb.prev_sql_addr=qb.address
and sw.sql_address=qw.address
and lb.id1=lw.id1
and sw.lockwait is not null
and sb.lockwait is null
and lb.block=1

三、也可用此句：

SELECT /*+ NO_MERGE(a) NO_MERGE(b) NO_MERGE(c) */
'Wait' "Status",
a.username,
a.machine,
a.sid,
a.serial#,
a.last_call_et "Seconds",
b.id1,
c.sql_text "SQL"
FROM v$session a, v$lock b, v$sqltext c
WHERE a.username IS NOT NULL
AND a.lockwait = b.kaddr
AND c.hash_value = a.sql_hash_value
UNION
SELECT /*+ NO_MERGE(a) NO_MERGE(b) NO_MERGE(c) */
'Lock' "Status",
a.username,
a.machine,
a.sid,
a.serial#,
a.last_call_et "Seconds",
b.id1,
c.sql_text "SQL"
FROM v$session a, v$lock b, v$sqltext c
WHERE b.id1 IN (SELECT /*+ NO_MERGE(d) NO_MERGE(e) */
DISTINCT e.id1
FROM v$session d, v$lock e
WHERE d.lockwait = e.kaddr)
AND a.username IS NOT NULL
AND a.sid = b.sid
AND b.request = 0
AND c.hash_value = a.sql_hash_value;

如果向更详细的显示username的信息可以加入

select 'blocker('||lb.sid||':'||sb.username||')-sql:'|| qb.sql_text blockers,sb.machine,sb.terminal,sb.logon_time,
'waiter ('||lw.sid||':'||sw.username||')-sql:'|| qw.sql_text waiters ,sw.machine,sw.terminal,sw.logon_time
from v$lock lb,
v$lock lw,
v$session sb,
v$session sw,
v$sql qb,
v$sql qw
where lb.sid=sb.sid
and lw.sid=sw.sid
and sb.prev_sql_addr=qb.address
and sw.sql_address=qw.address
and lb.id1=lw.id1
and sw.lockwait is not null
and sb.lockwait is null
and lb.block=1

三、--根据以上显示的信息可以知道当前产生锁和等待的用户信息
--那么就需要杀掉当前产生阻塞的用户，在执行杀掉用户进程前请咨询dba和该业务的同事，是否产生其他的不当影响

select sid,serial# from v$session sid in (...) --查询产生阻塞用户的 sid,serial#,然后
alter system kill session(sid,serial#); --杀掉产生阻塞的用户