Note: As of MySQL 5.0.19, mysql_fix_privilege_tables is superseded by mysql_upgrade, which should be used instead. See mysql_upgrade(1).
On Unix or Unix-like systems, update the system tables by running the mysql_fix_privilege_tables script:
You must run this script while the server is running. It attempts to connect to the server running on the local host as root. If your root account requires a password, indicate the password on the command line like this:
shell> mysql_fix_privilege_tables --password=root_password
The mysql_fix_privilege_tables script performs any actions necessary to convert your system tables to the current format. You might see some Duplicate column name warnings as it runs; you can ignore them.
After running the script, stop the server and restart it.
On Windows systems, MySQL distributions include a mysql_fix_privilege_tables.sql SQL script that you can run using the mysql client. For example, if your MySQL installation is located at C:\Program Files\MySQL\MySQL Server 5.0, the commands look like this:
C:\> cd "C:\Program Files\MySQL\MySQL Server 5.0" C:\> bin\mysql -u root -p mysql mysql> SOURCE scripts/mysql_fix_privilege_tables.sql
The mysql command will prompt you for the root password; enter it when prompted.
If your installation is located in some other directory, adjust the pathnames appropriately.
As with the Unix procedure, you might see some Duplicate column name warnings as mysql processes the statements in the mysql_fix_privilege_tables.sql script; you can ignore them.