How do I keep a mySQL database secure?

Question

I\'m going to be implementing a PHP/mySQL setup to store credit card information.

It seems like AES_ENCRYPT/AES_DECRYPT is the way to go,

Answer 1

Put your database files outside computer lets say external hdd and keep it at safe place. Works only if you can develop this project at only place where this external drive is placed :) Or you can at least protect those files using file system encryption tools like https://itsfoss.com/password-protect-folder-linux/

In case of production environment I agree with Kyle Cronin.