怎么解决MySql使用skipnameresolve解决外网连接客户端过慢的问题
发布时间：2022-03-04 10:50:56 所属栏目：MySql教程 来源：互联网
导读：小编给大家分享一下怎么解决MySql使用skip-name-resolve解决外网连接客户端过慢的问题，希望大家阅读完这篇文章后大所收获，下面让我们一起去探讨吧！ 使用以下进行解决 [mysqld] skip-name-resolve skip-grant-tables 官方的解释 How MySQL uses DNS When
 小编给大家分享一下怎么解决MySql使用skip-name-resolve解决外网连接客户端过慢的问题，希望大家阅读完这篇文章后大所收获，下面让我们一起去探讨吧！ 使用以下进行解决 [mysqld] skip-name-resolve skip-grant-tables 官方的解释 How MySQL uses DNS When a new thread connects to mysqld, mysqld will spawn a new thread to handle the request. This thread will first check if the hostname is in the hostname cache. If not the thread will call gethostbyaddr_r() and gethostbyname_r() to resolve the hostname. If the operating system doesn't support the above thread-safe calls, the thread will lock a mutex and call gethostbyaddr() and gethostbyname() instead. Note that in this case no other thread can resolve other hostnames that is not in the hostname cache until the first thread is ready. You can disable DNS host lookup by starting mysqld with –skip-name-resolve. In this case you can however only use IP names in the MySQL privilege tables. If you have a very slow DNS and many hosts, you can get more performance by either disabling DNS lookop with –skip-name-resolve or by increasing the HOST_CACHE_SIZE define (default: 128) and recompile mysqld. You can disable the hostname cache with –skip-host-cache. You can clear the hostname cache with FLUSH HOSTS or mysqladmin flush-hosts. If you don't want to allow connections over TCP/IP, you can do this by starting mysqld with –skip-networking. 根据文档说明，如果你的mysql主机查询DNS很慢或是有很多客户端主机时会导致连接很慢，由于我们的开发机器是不能够连接外网的，所以DNS解析是不可能完成的，从而也就明白了为什么连接那么慢了。同时，请注意在增加该配置参数后，mysql的授权表中的host字段就不能够使用域名而只能够使用 ip地址了，因为这是禁止了域名解析的结果。 看完了这篇文章，相信你对怎么解决MySql使用skip-name-resolve解决外网连接客户端过慢的问题有了一定的了解 （编辑：临夏站长网） 【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! |
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