MySQL - MySQL データベースの操作における人的エラーを防ぐ方法

[root@liuyazhuang151 ~]# mysql --help|grep dummy        
 -U, --i-am-a-dummy Synonym for option --safe-updates, -U.  
i-am-a-dummy      FALSE

[root@liuyazhuang151 ~]# mysql -uroot -proot -S /data/3306/mysql.sock -U  
Welcome to the MySQL monitor. Commands end with ; or \g.  
Your MySQL connection id is 14  
Server version: 5.5.32-log MySQL Community Server (GPL)  
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.  
Oracle is a registered trademark of Oracle Corporation and/or its  
affiliates. Other names may be trademarks of their respective  
owners.  
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.  
mysql> delete from oldboy.student;  
ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column  
mysql> quit  
Bye

[root@liuyazhuang151 ~]# alias mysql='mysql -U'  
[root@liuyazhuang151 ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sock  
Welcome to the MySQL monitor. Commands end with ; or \g.  
Your MySQL connection id is 15  
Server version: 5.5.32-log MySQL Community Server (GPL)  
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.  
mysql> delete from oldboy.student;  
ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column  
mysql> delete from oldboy.student where Sno=5;  
Query OK, 1 row affected (0.02 sec)  
mysql> quit  
Bye  
[root@liuyazhuang151 ~]# echo "alias mysql='mysql -U'" >>/etc/profile  
[root@liuyazhuang151 ~]# . /etc/profile  
[root@liuyazhuang151 ~]# tail -1 /etc/profile  
alias mysql='mysql -U'