原因：
服务器强制重启导致MySQL无法启动报错信息为：
The server quit without updating PID file(XXX/XXX.pid)
查看mysql日志报错信息为：
/www/server/mysql/bin/mysqld: Table ‘./mysql/db’ is marked as crashed and should be repaired
Fatal error: Can’t open and lock privilege tables: Table ‘./mysql/db’ is marked as crashed and should be repaired
修复方法：
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