blocked because of many connection errors; unblock with 'mysqladmin flush-hosts;MySQL在远程访问时非常慢的解决方法;MySql链接慢的解决方法
一:服务器异常:Host 'xx.xxx.xx.xxx' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
发现主机又出错了,错误是这样。ERROR 1129 (00000): Host 'XXXXXX' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
查了下资料
这说明mysqld已经得到了大量(max_connect_errors)的主机'hostname'的在中途被中断了的连接请求。在 max_connect_errors次失败请求后,mysqld认定出错了(象来字一个黑客的攻击),并且阻止该站点进一步的连接,直到某人执行命令 mysqladmin flush-hosts。
缺省地,mysqld在10个连接错误后阻塞一台主机。你可以通过象这样启动服务器很容易地调整它: set global max_connect_errors=1000;
注意,对给定的主机,如果得到这条错误消息,你应该首先检查该主机的TCP/IP连接有没有问题。如果你的TCP/IP连接不在运行,增加max_connect_errors变量的值对你也不会有帮助!
二:本地或者是远程连接mysql速度非常慢的原因和解决方法
当远程访问mysql时,mysql会解析域名,会导致访问速度很慢;
远程连接MYSQL速度慢,有时远程连接到MYSQL用时4-20秒不等,本地连接MYSQL正常,出现这种问题的主要原因是,默认安装的MYSQL开启了DNS的反向解析,在MY.INI(WINDOWS系统下)或MY.CNF(UNIX或LINUX系统下)文件的[mysqld]下加入skip-name-resolve这一句。
但是,这样会引起一个问题:连接mysql时,不能使用 localhost连接了,而是要使用IP地址的;如果是按localhost对用户赋权限的话,用户登录权限也要修改一下的。
# 禁止mysql做域名解析;如下配置后速度飞快
[mysqld]
skip-name-resolve
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