To restore a .sql file backup without constraint checking, simply add the following statements at the beginning of your .sql file:
SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT; SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS; SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION; SET NAMES utf8; SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0; SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0; SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO'; SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0;
At the end of the file, add the statements required to turn on constraint checking again:
SET SQL_MODE=@OLD_SQL_MODE; SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS; SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS; SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT; SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS; SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION; SET SQL_NOTES=@OLD_SQL_NOTES;
then use bigdump.php to upload/install the file to Mysql.