Mysql必读Mysql 错误too many connections解决方案
|
《Mysql必读Mysql 错误too many connections解决方案》要点： Mysql 错误提示too many connections,最近遇到这个错误,经过上网查资料解决了,这里记录下,帮助有需要的朋友,MYSQL学习 解决方法是修改/etc/mysql/my.cnf,添加以下一行:MYSQL学习 set-variable = max_connections=500MYSQL学习 或在启动命令中加上参数 max_connections=500MYSQL学习 就是修改最大连接数,然后重启mysql.默认的连接数是100,太少了,所以容易出现如题错误.MYSQL学习 以下是mysql.com网站的相关说明:MYSQL学习 If you get a Too many connections error when you try to connect to the mysqld server,this means that all available connections are in use by other clients.MYSQL学习 The number of connections allowed is controlled by the max_connections system variable. Its default value is 100. If you need to support more connections,you should restart mysqld with a larger value for this variable.MYSQL学习 mysqld actually allows max_connections+1 clients to connect. The extra connection is reserved for use by accounts that have the SUPER privilege. By granting the SUPER privilege to administrators and not to normal users (who should not need it),an administrator can connect to the server and use SHOW PROCESSLIST to diagnose problems even if the maximum number of unprivileged clients are connected. See Section 13.5.4.19,“SHOW PROCESSLIST Syntax”.MYSQL学习 The maximum number of connections MySQL can support depends on the quality of the thread library on a given platform. Linux or Solaris should be able to support 500-1000 simultaneous connections,depending on how much RAM you have and what your clients are doing. Static Linux binaries provided by MySQL AB can support up to 4000 connections.MYSQL学习 1.可能是mysql的max connections设置的问题MYSQL学习 2.可能是多次insert,update操作没有关闭session,需要在spring里配置transaction支持.MYSQL学习 解决:MYSQL学习 1.修改tomcat里的session 的time-out时间减少为20,(不是必改项)MYSQL学习 2.对处理量大的对数据库insert或update的操作提供transaction支持.MYSQL学习 =======================================MYSQL学习 下面的是解决办法：MYSQL学习 com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection,message from server: "Too many connections"MYSQL学习 原因：MYSQL学习 因为你的mysql安装目录下的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满MYSQL学习 解决方式：MYSQL学习 打开MYSQL安装目录打开MY.INI找到max_connections(在大约第93行)默认是100 一般设置到500～1000比较合适,重启mysql,这样1040错误就解决啦.MYSQL学习 max_connections=1000MYSQL学习 一定要重新启动MYSQL才能生效MYSQL学习 CMD->MYSQL学习 net stop mysqlMYSQL学习 net start mysqlMYSQL学习 关于改变innodb_log_file_size后无法启动mysql的问题MYSQL学习 innodb_buffer_pool_size=768M innodb_log_file_size=256M innodb_log_buffer_size=8M innodb_additional_mem_pool_size=4M innodb_flush_log_at_trx_commit=0 innodb_thread_concurrency=20 以上是对innodb引擎的初步优化,发现是更新innodb_log_file_size=256M时候出现了问题,只要加上这个就无法启动,MYSQL学习 后来才知道原来要STOP服务先,然后再删除原来的文件………MYSQL学习 打开/MySQL Server 5.5/dataMYSQL学习 删除ib_logfile0,ib_logfile1........ib_logfilenMYSQL学习 再开启选项,成功启动.MYSQL学习 感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!MYSQL学习 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |