node 轮询mysql ,报错,连接数过多

福尔摩斯对我笑 2019-03-11 8698 次 2066条



项目部署上线后,运行5分钟后发现出错,错误代码:MySQL: ERROR 1040: Too many connections,连接数过多。


mysql -u root -p

show full  processlist //查看连接数




查看连接池代码,也没有问题,查询后确实已经回收了,有点郁闷,查了 mysql模块的手册,确实也没问题啊。mysql模块手册

 async await_query(sql,values){
        return new Promise((resolve, reject) => {
            this.connect().getConnection(function (err, connection) {
                if (err) {
                } else {
                    connection.query(sql, values, (err, rows) => {
                        if (err) {
                            connection.release(); //回收了
                        } else {



connect().end(function (err) {


show variables like '%max_connections%';


set GLOBAL max_connections = 300;
  • 先来看看sleep的状态是什么意思?
  1. 客户端程序在退出之前没有关闭连接.[写程序的疏忽,或者数据库的db类库没有自动关闭每次的连接。
  2. 客户端sleep的时间在wait_timeout或interactive_timeout规定的秒内没有发出任何请求到服务器. [类似长连,类似于不完整的tcp ip协议构造,服务端一直认为客户端仍然存在(有可能客户端已经断掉了)]
  3. 客户端程序在结束之前向服务器发送了请求还没得到返回结果就结束掉了
  • 解决方法
  1. 修改mysql配置文件: wait_timeout=10 ,这样做需要重启服务器,不太好。
  2. 通过mysql命令修改

set global wait_timeout = 10;







show variables like '%timeout%';

发现,wait_timeout 还是 28800 , 默认的8小时。ok,继续搜寻吧 发现一篇博客:,这里解释了这个问题

2、数据库查询后我确实已经回收了该链接,为啥还是存在sleep呢? 麻烦知道的大神,解答下,谢谢


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