Database Backup Error

[falconking]

Using SSH (putty), I have followed the instructions posted here:

http://www.vbulletin.com/docs/html/maintenance_ssh_backup

to take a backup of my db, thru this command:

mysqldump --opt -Q -u king -p vb > backup.sql 

but I receive the following error (although I am 100% sure that the username, the dbname and password are all correct) :

mysqldump: Got error: 1044: Access denied for user 'king'@'localhost' to database 'vb' when selecting the database

What seems to be wrong here?! Is it permissions?!
How can I fix this, please!!!

[copiertalk]

see if their is a prefix for the username, database or even both. Cpanel added a prefix to mine when I set the username and database up.

[Hayk]

Show the exact folder of backup, e.g.

mysqldump --opt -Q -u king -p vb > www/dump/backup.sql

And be sure that username and dbname are correct.

[flnz400]

Pretty sure it should look more like this...

mysqldump --opt -uDB_UN-pPW-Dadmin_forum >
/home/DB_UN/DB_DBNAME-$(date +%Y%m%d%H).sql