mysql 同一IP 产生太多终端的数据库连接导致阻塞
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问题：null, message from server: "Host ‘ip‘ is blocked because of many connection errors; unblock with ‘mysqladmin flush-hosts‘
原因：同一个ip在短时间内产生太多（超过mysql数据库max_connection_errors的最大值）中断的数据库连接而导致的阻塞；
解决方案：
进入命令行 到mysql安装目录，bin文件夹下执行
mysqladmin -u username -p flush-hosts
输入password
password:
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