mysql>grant all privileges on test.* to 'root'@'%';
mysql>grant all privileges on *.* to 'root'@'%';
mysql>grant all privileges on *.* to 'liuhui'@'%';
mysql>grant all privileges on *.* to 'liuhui'@'%' IDENTIFIED BY 'liuhui';
mysql>grant all privileges on *.* to 'liuhui'@'10.1.1.1';
mysql>show variables like 'validate_password%';