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Beware of Carmen

Warning: this article was written over 14 years ago, some information may be out of date.

WordPress has been updated to version 2.9 (codename Carmen), and yesterday the Italian localisation also came out.
Although it is now straightforward to update, a preliminary check must be made in this case: this version of WordPress, in fact, only supports MySQL from version 4.1.2 or higher; version 5.0 is recommended.
Regardless of your maintainer, whether Webperte, Tophost, Aruba, or others, it is best to check which version you are using first.
The easiest way to see which version of MySQL is installed on your domain is to place this file, after unpacking it, on your domain at the same level as your site/blog via FTP.
This way, you can display the file in your browser with an address like https://www.mysite.com/info.php (for example, in my case, it would be /info.php). That file does nothing more than retrieve a bunch of information about the server.
Look for the MySQL entry, where there should be the Client API version parameter, which is the information you need. If it is lower than 4.1.2, avoid upgrading, contact your maintainer and ask them to upgrade MySQL to a higher version.
You can find an example of how to proceed in the case of Aruba on the WordPress Italy forum.
Finally, do not forget to delete the info.php file from your domain after checking the version.
In any case, backup your files and database before upgrading.

Happy blogging.

**Update**
Another way to see the MySQL version is to install the WP-ServerInfo plugin and click on Display MySQL Information.

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