Install MySQL 4.1
MySQL - http://www.mysql.com
Some have reported that MySQL 5.0.x works just fine as well. If you already have this version, there's likely no point in downgrading to 4.1.*.
To check: Run mysql --help on the command line
If not, download MySQL from:
Custom install to /opt/mysql (options vary slightly based on operating system)
Linux users should install MySQL using a package or binaries if possible
Choose standard configuration
Install as a windows service (Windows only)
Launch automatically (recommended)
If you choose not to do this, make sure that you startup MySQL before you try to run Sakai
Include the bin directory in Path
Don't use an anonymous account
Set your root password to "mysqlpwd1"