Hi On my postfix server when i try to query the database i get the following error

[root@mail ~]# postmap -q "agnello@niteshn.info" /etc/postfix/mysql_virtual_mailbox_maps.cf postmap: fatal: open database /etc/postfix/mysql_virtual_mailbox_maps.cf.db: No such file or directory

can some one please tell me where i have gone wrong

Thanks