在执行select语句运行了100多秒然后现了lost connection to MySQL server during query错误信息 排查原因: 1、查看explain执行计划发现了需要扫描将近...100多秒, 未触发阈值 参数:interactive\wait timeout 链接空闲超时1800秒,未触发阈值 3、查看了服务器的性能,发现cpu满载负荷,判定慢sql导致的cpu负载非常高,导致了mysql
if( in_array(mysql_errno(), array(2006, 2013))){ mysql_close(); mysql_connect(......); mysql_query(...); } 也就是说遇到2006,2013错误就重新连接一下MySQL。...MySQL Error 2013: Lost connection to MySQL server during query 错误代码: 1153 - Got a packet bigger than...'max_allowed_packet' bytes 解决方法: 修改mysql.ini(网上都说是这个文件,找了N久终于知道在哪里了,我的目录是在 D:\MySQL_Data\MySQL Server...5.5 在MySQL_Data文件夹下)文件添加如下代码即可 max_allowed_packet=500M 如果不可以的话就修改D:\MySQL\MySQL Server 5.5\my-huge.ini
(HY000): Lost connection to MySQL server during query No connection....2013 (Lost connection to MySQL server during query) for query 'SELECT c FROM sbtest1 WHERE id=4822870...' FATAL: mysql_drv_query() returned error 2013 (Lost connection to MySQL server during query) for query...'COMMIT' FATAL: mysql_drv_query() returned error 2013 (Lost connection to MySQL server during query)...]>select 1; ERROR 2013 (HY000): Lost connection to MySQL server during query No connection.
在远程连接mysql的时候,连接不上,出现如下报错: Lost connection to MySQL server at 'waiting for initial communication packet...原因分析: mysql开启了DNS的反向解析功能,这样mysql对连接的客户端会进行DNS主机名查找。...mysql的DNS反向解析: 1)mysql接收到连接请求后,获得的是客户端的ip,为了更好的匹配mysql.user里的权限记录(某些是用hostname定义的)。...2)在my.cnf配置文件中的[mysqld]区域添加skip-name-resolve,即跳过mysql连接的DNS反向解析功能,这样能很好地提高mysql性能。...在这种情况下,就只能使用MySQL授权表中的IP来连接mysql服务了。 对于第一种方法显然比较笨,也不实用!
Mysql错误Lost connection to MySQL server at ‘reading initial communication packet’, system error: 0解决方法...,需要的朋友可以参考下 远程连接mysql是总是提示: Lost connection to MySQL server at ‘reading initial communication packet'...其实问题很简单,都是MySQL的配置文件默认没有为远程连接配置好,只需要更改下MySQL的配置文件即可。 具体的解决步骤如下,希望能帮助遇到同样问题的同学们: 找到并修改my.cnf文件。...这里以Ubuntu Server做示例,其他系统请根据情况自行找到my.cnf的路径。一般只会存放在/etc/my.cnf或者/etc/mysql/my.cnf下。...然后找到[mysqld]部分的参数,在配置后面建立一个新行,添加下面这个参数:skip-name-resolve 保存文件并重启MySQL: /etc/init.d/mysql restart 这样就会发现
DDL语句,仍处于锁等待状态 mysql> rename table t1 to t2; ERROR 2013 (HY000): Lost connection to MySQL server during...> mysql> mysql> rename table t1 to t2; ERROR 2013 (HY000): Lost connection to MySQL server during...--reconnect Reconnect if the connection is lost....> kill 139; Query OK, 0 rows affected (0.00 sec) session2: mysql> rename table t1 to t2; ERROR 2013...(HY000): Lost connection to MySQL server during query 可以看到session2的会话连接已经被终止,并且没有自动重新连接,达到了我们想要的效果
结果没出来,直接就 Lost connection to MySQL server during query 而在MYSQL 的本地执行语句,就没有类似报错。...下面经过调整后,就可以查询出来,不会再有 Error Code 2013, Lost connection to Mysql server during query 的报错了。...3 max_allowed_packet 这个参与默认是16MB,一次发送的包大于这个数字,就会被终止连接(一般来说因为这个造成的Client and server 之间的断开比较少见,如果多见就请看看是不是对...那就的看看你使用的客户端的设置了,此例以 可以参考图上的一些数字设置,尤其 DBMS connection read timeout interval 和 DBMS connection timeout...以上例子在 MYSQL 5.7.23 与 MYSQL 8.018 是可以的,随着MYSQL 8 开始应用,到底MYSQL 5.7 和 MYSQL 8 在复制查询上的差距有多少,这个要好好看一看,要不怎么和领导提出要升级的要求
前言 最近发现一个比较奇特的 Lost connection 问题,详细测试和验证了一下,记录下来。 问题描述 用户反馈连接到数据库之后,执行show database的时候会断开连接。...原因分析 从反馈上来看,用户是可以登录到数据库的,说明网络的连通性,用户名密码方面没有问题,权限方面如果有问题的话,一般也不会有 Lost connection 的报错,MTU 的问题一般也是返回不了结果...Server version: 5.7.31-log MySQL Community Server (GPL) ...省略... mysql> show databases; ERROR 2013 (HY000...): Lost connection to MySQL server during query mysql> 发现可以复现 Lost connection 现象,说明问题就在这里了,如果是直接执行了语句...Server version: 5.7.31-log MySQL Community Server (GPL) ...省略... mysql> show databases; +------------
mysql> UPDATE runoob_tbl SET runoob_title='学习 C++' WHERE runoob_id=1;2013 - Lost connection to server...PHP", "菜鸟教程", NOW());2013 - Lost connection to server during querymysql> SELECT * FROM runoob_tbl;+-...- Lost connection to server during querymysql> UPDATE runoob_tbl SET runoob_title='学习 C++' WHERE runoob_id...=1;2013 - Lost connection to server during query2)写锁,对指定表加了写锁,会阻塞右侧客户端的读和写。...mysql> lock tables runoob_tbl write;Query OK, 0 rows affected (0.02 sec)mysql> unlock tables;Query OK
这是学习笔记的第 2028 篇文章 前几天睡觉前接到前同事的一个信息,说有个奇怪的SQL问题,想让我帮忙看看,给点建议,我以为是一种非常复杂的SQL,他的反馈能让MySQL崩溃。...as sub_tmp order by new_t10 + 1) union (select sub_tmp.id,sub_tmp.id from t10_sub as sub_tmp); ERROR 2013...(HY000): Lost connection to MySQL server during query 当然这个操作是可以复现,通过这个 写入1条数据 mysql> insert into t10...as sub_tmp order by new_t10 + 1) union (select sub_tmp.id,sub_tmp.id from t10_sub as sub_tmp); ERROR 2013...(HY000): Lost connection to MySQL server during query 可以看到这次结果比较统一,执行计划解析和查询操作都会导致会话崩溃。
'select * from t1 order by func1(a)' failed: 2013: Lost connection to MySQL server during query safe_process...[7080]: Child process: 7081, exit: 1 Server [mysqld.1 - pid: 7089, winpid: 7089, exit: 256] failed during...test run Server log from this test: Lost connection ,MySQL 服务已停止。...Query (7fc234005890): select * from t1 order by func1(a) Connection ID (thread ID): 2 Status: NOT_KILLED...Query (7fc234005890): select * from t1 order by func1(a) Connection ID (thread ID): 2 Status: NOT_KILLED
切换过程中的影响 切换过程并非完全没有任何影响,一般会产生一次中断,但当再次发起请求时(重试时)就能恢复正常 下面的过程就是在切换中进行操作的 mysql> show tables; ERROR 2013...(HY000): Lost connection to MySQL server during query mysql> show tables; ERROR 2006 (HY000): MySQL...server has gone away No connection....Connection id: 175 Current database: cctest +------------------+ | Tables in cctest | +----------...-1.5-GA-20160217103036-linux.tar.gz . tar -zxvf Mycat-server-1.5-GA-20160217103036-linux.tar.gz java
away This section also covers the related Lost connection to server during query error....-You tried to run a query after closing the connection to the server....to the MySQL server....Start by checking whether issuing the query again kills the server again....This logs some of the disconnection messages in the hostname.err file.
Lost connection to MySQL server at 'xx.xxx.xx.xxx:3306' 定位问题 当时从 MySQL 的错误日志和 linux 的系统日志上都没有发现问题,唯一有记录的日志就是慢日志..._connection.cmd_query(stmt)) File "/usr/local/lib/python3.9/site-packages/mysql/connector/connection.py..._send_cmd(ServerCmd.QUERY, query)) File "/usr/local/lib/python3.9/site-packages/mysql/connector/connection.py...connection to MySQL server at '127.0.0.1:3306', system error: The read operation timed out mysql server...is offline 好现在看到报错中的 `Lost connection to MySQL server at '127.0.0.1:3306'` 了,问题完美的复现了。
01 MySQL中的kill语法 在MySQL中,kill命令分为如下两种: 1、kill query + pid 2、kill connection + pid 其中connection可以省略...当收到kill query 的命令后,MySQL将会执行哪些动作?...> kill 4; Query OK, 0 rows affected (0.00 sec) ---------会话3-------- ERROR 2013 (HY000): Lost connection...to MySQL server during query 可以看到,当执行kill 4的时候,会话3的连接才断开,在执行kill 4的时候,MySQL做了如下几个动作: 1、 将线程状态置为kill_connection...在MySQL中,如果一个线程的状态是KILL_CONNECTION,就把Command列显示Killed。
= mysql.createConnection(config) // 执行SQL connection.query(sql, function (err, result) { err // 错误信息...mysql Error: Connection lost The server closed the connection 。...== 'PROTOCOL_CONNECTION_LOST') { connect(); } else { console.error(err.stack || err);...推荐使用连接池方式 用 createConnection 创建 Mysql 连接,每执行一次 connection.query 都是一个全新的连接,会造成一个资源的极大浪费,降低性能,如果操作不当还会造成连接中断的情况...,connection){}); //从 一个连接池里面获取连接 poolCluster.getConnectiuon('MASTER',function(err,connection){}); //
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