Why Can't I Connect to MySQL with My Root User Password on macOS?

Troubleshooting MySQL Root User Password on OS X

The inability to connect to MySQL using the root user password after setting it can be frustrating. This issue may arise following a fresh MySQL installation on Mac OS X. To understand why this happens and find a solution, let's delve into the problem.

Problem:
Users report attempting to set the root user password using mysqladmin commands but encounter a situation where they can still access the MySQL command line without providing a password.

Cause:
The password change may not have been properly implemented due to missing privileges.

Solution:
To resolve this issue, try the following steps:

1. FLUSH PRIVILEGES: Log into the MySQL terminal and execute FLUSH PRIVILEGES. This refreshes the privilege table, ensuring that the newly set password takes effect.
2. Update Password via Terminal: If FLUSH PRIVILEGES fails, type the following commands into the MySQL terminal, replacing NEWPASSWORD with your desired password:

mysql -u root

mysql> USE mysql;
mysql> UPDATE user SET password=PASSWORD("NEWPASSWORD") WHERE User='root';
mysql> FLUSH PRIVILEGES;
mysql> quit

Note for MySQL 5.7 :
From MySQL 5.7 onward, the password field has been renamed to authentication_string. To change the password, use this command instead:

mysql> UPDATE user SET authentication_string=PASSWORD("NEWPASSWORD") WHERE User='root';

Additional Note for MySQL 8.0 :
For MySQL 8.0 and above, use the following command to alter the root user's password:

mysql> `ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';` 

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