Mysql中Sleep进程连接数过多问题解决

mysql> show processlist;
mysql> SELECT concat(‘KILL ‘,id,‘;‘) FROM information_schema.processlist WHERE user=‘user1‘;
mysql> select concat(‘KILL ‘,id,‘;‘) from information_schema.processlist where user=‘user1‘ into outfile ‘/tmp/a.txt‘;
mysql> source /tmp/a.txt;

其中上面user1用户是“show processlist;” 命令下，User列对应最多的Sleep进程连接状态的用户。
注：如上面导出为指定文件路径报“ERROR 1290 (HY000): The MySQL Server is running with the --secure-file-priv option so it cannot execute this statement”错误。

是由于MySQL在文件的导入、导出有个默认的文件路径。通过“show variables like ‘%secure%‘;”命令查看默认导入、导出文件路径。

从上面可看出默认路径为“/var/lib/mysql-files/”；所以改下导出文件路径：

然后在执行“source /var/lib/mysql-files/a.txt;”命令，接下来是出现一堆“Query OK, 0 rows affected (0.00 sec)”，执行成功。
2)、另一种是写shell脚步方法，配合设置cron定时任务

#!/bin/sh
while :
do
sleep_num=`mysqladmin processlist -u user -ppassword -h 10.10.10.100 | grep -ie sleep |wc -l`
date=`date +%Y%m%d[%H:%M:%S]`
echo $sleep_num
if [ "$sleep_num" -gt 100 ];then
    for i in `mysqladmin processlist -u user -ppassword -h 10.10.10.100 | grep -ie sleep | awk ‘{print $2}‘`
    do
        mysqladmin -u user -ppassword -h 10.10.10.100  kill $i
    done
echo "sleep is too many more than 100, killed it " >> /tmp/sleep.log
echo "$date : $sleep_num" >> /tmp/sleep.log
fi
sleep 1
done

接下来设置个cron定时任务，设置多长时间跑一次。

set global wait_timeout=3600;
set global interactive_timeout=3600;