Several Methods to crack the root password of mysql

Several Methods to crack the mysql root Password:
Method 1

Use phpmyadmin, which is the simplest. Modify the user table of the mysql database, but do not forget to use the PASSWORD function.

Method 2

Use mysqladmin, which is a special case stated above.

Mysqladmin-u root-p password mypasswd

After entering this command, you need to enter the original root password, and then the root password will be changed to mypasswd.

Change the root in the command to your username, and you can change your password.

Of course, if your mysqladmin cannot connect to mysql server, or you cannot execute mysqladmin, this method is invalid, and mysqladmin cannot clear the password.

The following methods are used at the mysql prompt and must have the root permission of mysql:

Method 3

Mysql> Insert INTO mysql. user (Host, User, Password)

VALUES ('%', 'Jeffrey ', PASSWORD ('biscuit '));

Mysql> FLUSH PRIVILEGES

Specifically, this is adding a user with the username jeffrey and password biscuit.

This example is provided in mysql Chinese Reference Manual:

Be sure to use the PASSWORD function, and then use flush privileges.

Method 4

Similar to method Sany, but the REPLACE statement is used.

Mysql> replace into mysql. user (Host, User, Password)

VALUES ('%', 'Jeffrey ', PASSWORD ('biscuit '));

Mysql> FLUSH PRIVILEGES

Method 5

Use the set password statement,

Mysql> set password for jeffrey @ "%" = PASSWORD ('biscuit ');

You must use the PASSWORD () function, but do not need to use flush privileges.

Method 6

Use the GRANT... identified by statement

Mysql> grant usage on *. * TO jeffrey @ "%" identified by 'biscuit ';

Here, the PASSWORD () function is unnecessary and does not need to be flush privileges.

Note: PASSWORD () [not] implements PASSWORD encryption in the same way as Unix PASSWORD encryption.

How to fix MySQL password loss

If MySQL is running, killall-TERM mysqld is first killed.

Start MySQL: bin/safe_mysqld -- skip-grant-tables &

You can access MySQL without a password.

Then

> Use mysql

> Update user set password = password ("new_pass") where user = "root ";

> Flush privileges;

Kill MySQL again and start MySQL in a normal way.

Clear mysql password

Windows:

1. log on to the system as a system administrator.

2. Stop MySQL services.

3. Go to the Command window and enter the MySQL installation directory. For example, if my installation directory is c: \ mysql, go to C: \ mysql \ bin.

4. Skip the permission check and start MySQL,

C: \ mysql \ bin> mysqld-nt -- skip-grant-tables

5. open a new window, go to the c: \ mysql \ bin directory, and set the new root password.

C: \ mysql \ bin> mysqladmin-u root flush-privileges password "newpassword"

C: \ mysql \ bin> mysqladmin-u root-p shutdown

Replace newpassword with the root password you want to use. The second command will prompt you to enter a new password and repeat the password entered by the first command.

6. Stop MySQL Server and start Mysql in Normal Mode

7. You can use a new password to link to Mysql.

Unix & Linux:

1. log on to the system using root or a user running mysqld;

2. Use the kill command to end the mysqld process;

3. Use the -- skip-grant-tables parameter to start MySQL Server

Shell> mysqld_safe -- skip-grant-tables &

4. Set a new password for root @ localhost

Shell> mysqladmin-u root flush-privileges password "newpassword"

5. Restart MySQL Server

Mysql password change

To modify mysql, run the following command on the mysql command line:

Mysql-u root mysql

Mysql> Update user SET password = PASSWORD ("new password") Where user = 'name ';

Mysql> flush privileges;

Mysql> QUIT

How to restore the password of a MySQL database

Because the MySQL password is stored in the user table in the mysql database, you only need to copy the user table in MySQL under windows 2003 to overwrite it.

In c: \ mysql \ data \ mysql \ (linux, there are three user table related files in the/var/lib/mysql/) directory. frm, user. MYD, user. MYI

User. frm // user Table Style File

User. MYD // user table data file

User. MYI // user table index file

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