Oracle的锁表与解锁

--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;

--查看被锁的表?
select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;

--查看那个用户那个进程照成死锁
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;

--查看连接的进程?
SELECT sid,serial#,username,osuser FROM v$session;

--3.查出锁定表的sid,os_user_name,machine_name,terminal，锁的type,mode
SELECT s.sid,s.serial#,s.username,s.schemaname,s.osuser,s.process,s.machine,
s.terminal,s.logon_time,l.type
FROM v$session s,v$lock l
WHERE s.sid = l.sid
AND s.username IS NOT NULL
ORDER BY sid;

这个语句将查找到数据库中所有的DML语句产生的锁，还可以发现，
任何DML语句其实产生了两个锁，一个是表锁，一个是行锁。

--杀掉进程 sid,serial#
alter system kill session‘210,11562‘;

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Oracle的锁表与解锁??

SELECT /*+ rule */ s.username,
decode(l.type,‘TM‘,‘TABLE LOCK‘,
‘TX‘,‘ROW LOCK‘,
NULL) LOCK_LEVEL,
o.owner,o.object_name,o.object_type,
s.sid,s.terminal,s.program,s.osuser
FROM v$session s,v$lock l,dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username is NOT Null

--kill session语句
alter system kill session‘50,492‘;
--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;
--1.查出锁定object的session的信息以及被锁定的object名
SELECT l.session_id sid,l.locked_mode,l.oracle_username,
l.os_user_name,s.logon_time
FROM v$locked_object l,all_objects o,v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY sid,s.serial# ;
--2.查出锁定表的session的sid,machine name,terminal和执行的语句
--比上面那段多出sql_text和action
SELECT l.session_id sid,s.user#,a.sql_text,a.action
FROM v$sqlarea a,v$session s,v$locked_object l
WHERE l.session_id = s.sid
AND s.prev_sql_addr = a.address
ORDER BY sid,s.serial#;
--3.查出锁定表的sid,v$lock l
WHERE s.sid = l.sid
AND s.username IS NOT NULL
ORDER BY sid;