oracle查看被锁的表和解锁的方法

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hanfuyou 2019-05-11 20:59:34 博主文章分类：软件

--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, serial#,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';

查询指定用户状态： select username,password,account_status,lock_date,profile from dba_users where username='NCCW';

解锁用户 SQL> alter user NCCW account unlock;

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#;