Oracle与MySQL中如何查询被锁的表

Oracle

前提

操作的前提 用 sys 用户 以 sysdba角色登录

第一种解锁表的方式

查询被锁的表

select object_name,machine,s.sid,s.serial#
from v$locked_object l,dba_objects o ,v$session s
where l.object_id　=　o.object_id and l.session_id=s.sid;

查询那个session引起表被锁

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；

select object_name,machine,s.sid,s.serial#
from v$locked_object l,dba_objects o ,v$session s
where l.object_id　=　o.object_id and l.session_id=s.sid;

解锁表

ALTER system kill session 'sid, serial#';

第二种解锁表的方式

查看被锁的表

SELECT p.spid, a.serial#, c.object_name, b.session_id, b.oracle_username,b.os_user_name
FROM v$process p, v$session a, v$locked_object b, all_objects c
WHERE p.addr = a.paddr 
AND a.process = b.process
AND c.object_id = b.object_id;

批量解锁

declare cursor mycur is   
select b.sid,b.serial#   
　　from v$locked_object a,v$session b   
　　where a.session_id = b.sid group by b.sid,b.serial#;   
   
begin   
  for cur in mycur   
    loop     
     execute immediate ( 'alter system  kill session  '''||cur.sid || ','|| cur.SERIAL# ||''' ');   
     end loop;   
end;

MySQL

第一种解锁表的方式

查看当前数据库锁表的情况

SELECT * FROM information_schema.INNODB_TRX;

杀掉查询结果中锁表的trx_mysql_thread_id

 kill trx_mysql_thread_id

第二种解锁表的方式

查询是否锁表

 show OPEN TABLES where In_use > 0; 

查询进程

show processlist

杀掉查询到相对应的进程

kill id

补充

查看正在锁的事务

SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCKS; 

查看等待锁的事务

SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCK_WAITS;