https://blog.offline-net.com/2010/11/14/dtiserversmanvps%ef%bc%9amysqlmysqlcheck%e3%83%86%e3%83%bc%e3%83%96%e3%83%ab%e3%83%a1%e3%83%b3%e3%83%86%e3%83%8a%e3%83%b3%e3%82%b9%e3%81%a8%e4%bf%ae%e5%be%a9%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9/