backup database:
mysqldump -u****** -p****** -h****** db_name > 20170831.sql
restore database:
mysql -u****** -p****** -h****** db_name < 20170831.sql
backup database:
mysqldump -u****** -p****** -h****** db_name > 20170831.sql
restore database:
mysql -u****** -p****** -h****** db_name < 20170831.sql