restoring a database

[Malavika Krishnaswamy]

Hi,

I have an application that runs on a mysql database. I need to replace the database with another newer version database which is going to have the same name . I am planning to run the command mysql -u username -p -h localhost < database.sql. I am not sure what will happen to the front end of the application when this command is running. It is basically going to replace the database which the application is currently using. will I not be able to use the application at that time? Also will it overwrite all the existing tables/database.