net start mysql MySQL service is starting. MySQL service failed to start.The service did not report any errors.

When starting the project, I found that the project that worked yesterday can't run today.At first glance, it turned out that there was a problem with the mysql database, and the remote database could not be connected.So how can this be done?Start dos in administrator mode and enter net start mysql:

A problem occurred: The MySQL service is starting. The MySQL service failed to start.The service did not report any errors.

What's going on here?

Is mysql installed

First check the version of mysql:

mysql -V

No problem.

Check environment variables

Then check the configuration of environment variables, because it can still run yesterday, so it should not be a problem of configuration of environment variables.

System variables:

User Environment Variables:

Sure enough, the configuration variables of the environment are normal.

I haven't checked out the problem at this step. Is this problem really unsolvable?Of course not

Check Services

Enter the installation directory of your own mysql bin file:

My directory is:

Execute in the current bin directory:

mysqld --remove

mysqld --install

mysqld --remove command uninstalls the originally installed mysql service

mysqld --install command will reinstall the service

Restart the mysql service

net start mysql

I solved it at this step, and the mysql service can be started successfully.

Login to mysql, and a new problem occurs:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

This means that the login password is wrong

I don't know what to do with the password?

Of course there is a way.We can solve this by forcing a password change

1. Open cmd with super administrator and close the service

net stop mysql

2. Skip permission verification to log in to mysql

mysqld --shared-memory --skip-grant-tables

3. Restart the mysql service and log in to mysql

net start mysql

mysql -u root -p

4. Switch to mysql and leave the password blank.

use mysql;

update user set authentication_string='' where user='root';

flush privileges;

5. Set encryption rules and update new password (''newpassword'' is your new password)

alter user 'root'@'localhost' identified by 'newpassword';

grant all privileges on *.* to "root"@'localhost';

flush privileges;

Re-login to mysql according to the changed new password.

At this point, this problem that has been bothering me for several days has finally been solved.

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