How to import huge data file to MySQL

Recently I have a problem while importing the database file to mysql database using phpmyadmin. My file size has huge amount than they given. i.e. my file has morethan 2.5 MB.

For this, I have import and export data to database by using the following commands.

1) Import data to my database

E:\> mysql -u "mysql_user_name" -p"mysql_password" myapp_development < rails_backup.sql 

2) Export Data from database as sql file

E:\> mysql -u "mysql_user_name" -p"mysql_password" myapp_development > rails_backup.sql

Here "myapp_development" is my database name.