For databases larger than 100MB, we suggest uploading via the command line using Terminal in cPanel.
The syntax would be:
mysql -p -u user_name data_base < new_databse.sql
user_name is your cPanel username
data_base is the database to import to
new_databse.sql is the .sql file you are trying to import
You will then be prompted for a password. That will be your cPanel password.