mysql database

I am moving servers and I am trying to backup in one server and restore in another. The file manager is never any issue. The problem is the restore MySQL it does not make a MySQL user and it never connects to the database. The name change after restoring but I update the WP config file but still...

I made a facebook script, my question is if i put Order by rand() from a database limit=50 if i have 10000 ids in my database, and if i execute 2 times so it will execute 50 random ids for 2 times if there any chance that it will excute particular one id for all the 2 times?