Ubuntu下MySQL数据库错误解决：ERROR 1045: Access denied for user: 'root@localhost' (Using password: NO)

启用mysql都出现这个问题 提示

ERROR 1045: Access denied for user: 'root@localhost' (Using password: NO)
然后输入命令# mysql -p
Enter password:
输入相应密码可顺利进入数据库，但是要是想备份就不可以了，键入
#mysqldump database>databak.sql
就又出现RROR 1045: Access denied for user: 'root@localhost' (Using password: NO)

解决办法

登陆mysql,然后执行下面语句:mysql>set password for 'root'@'localhost' =password('');mysql>flush privileges;然后再重新登陆.