(1) asked me why what about landing procedures and MD5 encryption of your password fields with no blob
(2) is part of the landing short or long link link?
数据库的连接用长连接， 如果用短连接频繁的通信会造成socket错误，而且频繁的socket 创建也是对资源的浪费。一般的网络游戏应用都是长连接
长连接：指在一个TCP连接上可以连续发送多个数据包，在TCP连接保持期间，如果没有数据包发送，需要双方发检测包以维持此连接
短连接：指通信双方有数据交互时，就建立一个TCP连接，数据发送完成后，则断开此TCP连接；
What (3) is a database engine used?
HEAP InnoDB MyISAM ISAM
(4) how to back up the database from being deleted?
Binlog use of flashback misuse of data
if not open binlog, there is no pre-generated rollback SQL, it really can not be quickly rolled back
(5) project in what makes you feel outstanding?
