mysql>select concat('KILL ',id,';') from information_schema.processlist where user='service' and info like 'SELECT t2.* FROM  t_ec_order t1,t_ec_insurance t2%' into outfile '/tmp/a.txt'; 

mysql>source /tmp/a.txt 

1、通过information_schema.processlist表中的连接信息生成需要处理掉的MySQL连接的语句临时文件，然后执行临时文件中生成的指令 

mysql> select concat('KILL ',id,';') from information_schema.processlist where user='root'; 

+------------------------+ 
| concat('KILL ',id,';') |
+------------------------+ 
| KILL 3101;             |
| KILL 2946;             |
+------------------------+ 

2 rows in set (0.00 sec) 

mysql>select concat('KILL ',id,';') from information_schema.processlist where user='root' into outfile '/tmp/a.txt'; 
Query OK, 2 rows affected (0.00 sec) 

mysql>source /tmp/a.txt; 
Query OK, 0 rows affected (0.00 sec) 

2、杀掉当前所有的MySQL连接 
mysqladmin -uroot -p processlist|awk -F "|" '{print $2}'|xargs -n 1 mysqladmin -uroot -p kill 

杀掉指定用户运行的连接，这里为Mike 
mysqladmin -uroot -p processlist|awk -F "|" '{if($3 == "Mike")print $2}'|xargs -n 1 mysqladmin -uroot -p kill 

3、通过SHEL脚本实现 
#杀掉锁定的MySQL连接 

for id in `mysqladmin processlist|grep -i locked|awk '{print $1}'` 
do 
 mysqladmin kill ${id} 
done 

4、通过Maatkit工具集中提供的mk-kill命令进行 

#杀掉超过60秒的sql 
mk-kill -busy-time 60 -kill 

#如果你想先不杀，先看看有哪些sql运行超过60秒 
mk-kill -busy-time 60 -print 

#如果你想杀掉，同时输出杀掉了哪些进程 
mk-kill -busy-time 60 -print –kill 

5、查询session分布
select SUBSTRING_INDEX(host,':',1) as ip ,user,COMMAND, count(*) from information_schema.processlist group by ip,user,COMMAND;