mysqldump --skip-opt --single-transaction --user=root --password=xxx --all-databases > "/root/drupal/mysqldump-all-databases-2010-04-27.txt"
mysqldump --skip-opt --single-transaction --user=root --password=xxx --databases drupaldb01 > "/root/drupal/mysqldump-database-drupaldb01-2010-04-27.txt"

mysqladmin --user=root --password=xxx drop drupaldb01 --force
mysqladmin --user=root --password=xxx create drupaldb01

mysql --user=root --password=xxx < /root/drupal/mysqldump-all-databases-2010-04-27.txt
or
mysql --user=root --password=xxx drupaldb01 < /root/drupal/mysqldump-database-drupaldb01-2010-04-27.txt