root비번을 잊어버렸을때..

service mysql stop 

wait until MySQL shuts down. Then run 

mysqld_safe --skip-grant-tables & 

then you will be able to login as root with no password. 

mysql -uroot mysql 

In MySQL command line prompt issue the following command: 

UPDATE user SET password=PASSWORD("abcd") WHERE user="root"; 
FLUSH PRIVILEGES; 
EXIT 

/etc/init.d/mysqld restart 

At this time your root password is reset to "abcd" and MySQL will now 
know the privileges and you'll be able to login with your new password: 

mysql -uroot -p mysq


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