I should have 1500 links in my database before i move to my new server. After backed it up to my hard disk, all *.db have 0 byte of data.

Now i upload it to a new server, all my link.db, and backup *.db are 0 bytes, and the url.db still has all urls. when i build all, there is no links shown up within any categories. What can i do or what is wrong? any suggestions is appreciated.