Bootstrapping error!

SQLSTATE[HY000] [2005] Unknown MySQL server host 'sql3.tophosting.cz' (110)

Stack Trace

#0 /DISK2/WWW/dovolena-jizni-afrika.cz/www/library/Zend/Db/Adapter/Abstract.php(417): Zend_Db_Adapter_Pdo_Abstract->_connect()
#1 /DISK2/WWW/dovolena-jizni-afrika.cz/www/library/Zend/Db/Adapter/Pdo/Abstract.php(230): Zend_Db_Adapter_Abstract->query('SET NAMES utf8', Array)
#2 /DISK2/WWW/dovolena-jizni-afrika.cz/www/application/bootstrap.php(18): Zend_Db_Adapter_Pdo_Abstract->query('SET NAMES utf8')
#3 /DISK2/WWW/dovolena-jizni-afrika.cz/www/index.php(24): require('/DISK2/WWW/dovo...')
#4 {main}