Manual diz:
C.5.4.1.1. Resetting the Root Password: Windows Systems On Windows,
use the following procedure to reset the password for all MySQL root
accounts:
- Log on to your system as Administrator.
- Stop the MySQL server if it is running. For a server that is
running as a Windows service, go to the Services manager: From the
Start menu, select Control Panel, then Administrative Tools, then
Services. Find the MySQL service in the list and stop it. If your
server is not running as a service, you may need to use the Task
Manager to force it to stop.
-
Create a text file containing the following statements. Replace
the password with the password that you want to use.
UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root'; FLUSH PRIVILEGES;
Write the UPDATE and FLUSH statements each on a single line. The
UPDATE statement resets the password for all root accounts, and the
FLUSH statement tells the server to reload the grant tables into
memory so that it notices the password change.
- Save the file. For this example, the file will be named
C:\mysql-init.txt
.
- Open a console window to get to the command prompt: From the Start
menu, select Run, then enter cmd as the command to be run.
-
Start the MySQL server with the special --init-file
option (notice
that the backslash in the option value is doubled):
C:\> C:\mysql\bin\mysqld-nt --init-file=C:\mysql-init.txt
If you installed
MySQL to a location other than C:\mysql
, adjust the command
accordingly. The server executes the contents of the file named by
the --init-file
option at startup, changing each root account
password. You can also add the --console
option to the command if you
want server output to appear in the console window rather than in a
log file. If you installed MySQL using the MySQL Installation Wizard,
you may need to specify a --defaults-file
option:
C:\> "C:\Program Files\MySQL\MySQL Server 5.0\bin\mysqld-nt.exe" --defaults-file="C:\Program Files\MySQL\MySQL Server 5.0\my.ini" --init-file=C:\mysql-init.txt
The appropriate
--defaults-file
setting can be found using the Services Manager: From
the Start menu, select Control Panel, then Administrative Tools, then
Services. Find the MySQL service in the list, right-click it, and
choose the Properties option. The Path to executable field contains
the --defaults-file
setting.
7. After the server has started successfully, delete C:\mysql-init.txt
.
Então, primeiro você tem que criar o arquivo como indicado no ponto 3 e, em seguida, usando uma linha de comando (Iniciar-> Executar-> CMD (ENTER), execute mysqld-nt.exe com --init-file
param apontando para isso Lembre-se de usar o caminho completo para o mysqld-nt.exe e seu arquivo criado.