are you talking about the limitations imposed by your hosting company?
In that case many hosts allow you to upload your sql file to your website, and they'll import it via command line for you.
Otherwise you can split it in parts smaller than the maximum file size allowed by your host. To do this simply open your file with an editor that can handle large files ( programmers notepad, intype etc), and consecutive save parts of that file into separate files and import them via phpmyadmin.