Install:
sudo apt-get update
sudo apt-get install mysql

Change Password :
mysqladmin -u root -p'new123' password '123@root'

Backup & Restore All DB:
mysqldump --all-databases --single-transaction --user=root --password > all_databases.sql

Backup & Restore Single DB:
mysql -uroot -p < database_backup.sql
mysql -uroot -p database_name < mysql -uroot -p < database_backup.sql

MySQL Incremental Backup
mysqldump -h $HOST -u $DB_USER -p$DB_PASSWORD --single-transaction --quick $DB_NAME_EWO |gzip > /home/ubuntu/database_backup/$BACKUP_FOLDER/$DB_NAME_EWO-$NOWDATE.sql.gz