定时备份数据库很有必要啊；应该是root密码被攻破了，目前已经禁用root远程登录了；所有数据库只留下一个记录： 
Dear Sir/Madam, We hope this message finds you well. We would like to let you know that if you want to get your data back, simply send 0.011 BTC to this address: 1AybV7KgS1mwBU-------------4 - This address is assigned to your database. We will know when you have paid. After payment: do not change your database login details, because after p...