Some releases of MySQL introduce changes to the structure of the
system tables in the
mysql database to add
new privileges or support new features. When you update to a new
version of MySQL, you should update your system tables as well
to make sure that their structure is up to date. Otherwise,
there might be capabilities that you cannot take advantage of.
First, make a backup of your
and then use the following procedure.
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
requires a password, indicate the password on the command line.
For MySQL 4.1 and up, specify the password like this:
Prior to MySQL 4.1, specify the password like this:
The mysql_fix_privilege_tables script
performs any actions necessary to convert your system tables to
the current format. You might see some
name warnings as it runs; you can ignore them.
After running the script, stop the server and restart it so that it uses any changes that were made to the system tables.
On Windows systems, there isn't an easy way to update the system
tables until MySQL 4.0.15. From version 4.0.15 on, 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
4.1, the commands look like this:
cd "C:\Program Files\MySQL\MySQL Server 4.1"C:\>
bin\mysql -u root -p mysqlmysql>
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 path names 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.
After running the script, stop the server and restart it.