一、修改口令

mysqladmin -u root password "newpass"

mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

 

mysql> use mysql;

mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';

mysql> FLUSH PRIVILEGES;

忘记root口令

#/opt/rh/root/usr/bin

scl enable mysql55 'mysqld_safe --skip-grant-tables'

# vi /etc/my.cnf

在[mysqld]的段中加上一句:skip-grant-tables

二、文件位置

/etc/my.cfg　　[mysqld]　　datadir

show variables like '%datadir';