1. 问题：mysql启动报错(linux)
[root@localhost ~]# service mysqld restart
Another MySQL daemon already running with the same unix socket.
Starting mysqld: [FAILED]
解决方法：
[root@localhost ~] mv /var/lib/mysql/mysql.sock /var/lib/mysql/mysql.sock.bak
[root@localhost ~]# service mysqld restart
2. 问题：navicat连接mysql:报1130错误(windons)
1130: Host xxx.xxx.xxx.xxx is not allowedto connect to this MySQL server
解决方法：
mysql>use mysql
mysql>update user set host = '%' where user ='root';
mysql>flush privileges;
mysql>select 'host','user' from user where user='root';
mysql>quit
3. 问题: navicat连接mysql:报1045错误
1045 Access denied for user 'root'@'localhost' (using password:YES)
解决方法：
/etc/init.d/mysqld stop
mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('123456') where USER='root';
(UPDATE user SET Password=PASSWORD('123456') where USER='root' and host='root' or host='localhost';)
mysql> FLUSH PRIVILEGES;
mysql> quit
/etc/init.d/mysqld restart
4. 问题: navicat连接mysql:报10060错误
Can't connect to MySQL server (10060)
解决方法：
http://database.51cto.com/art/201107/274565.htm（重点检查3306端口是否已经开放）
5. 问题：如何创建其他账号远程连接mysql服务器
mysql>use
mysql
mysql>GRANT ALL PRIVILEGES ON *.* TO 'sems_mysql'@'%' IDENTIFIED BY 'gziscassems' WITH GRANT OPTION;
6. 问题： navicat连接mysql:报10061错误
2003- can.t connect to MySQL server on xxx.xxx.xxx.xxx (10061)
解决方法：
启动mysql服务
[root@centos64 ~]# service mysqld start
7 问题：navicat连接mysql：报ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'mysql'
/etc/init.d/mysqld
stop
mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
mysql -u root mysql
mysql> delete from user where USER='';
mysql> FLUSH PRIVILEGES;//记得要这句话，否则如果关闭先前的终端，又会出现原来的错误
mysql> quit