Using mysqldump, the example goes here :
#mysqldump -uroot
-prootpassword database_name
If we use gzip for the compression :
#mysqldump -uroot -prootpassword database_name | gzip >
/home/admin/backup_mysql.sql.gz without the gzip :
#mysqldump -uroot
-prootpassword database_name > /home/admin/backup_mysql.sql