My question is regarding Data Model .
1.What are the best practices in Designing and Optimizing the Data Model in Qlikview?
2. How multiple users can access the qvw files from server?
About level of normalization of the data model, see
The proper way to publish a qvw to several users is to publish it on a QlikView server. Then, the users can connect to the server and get a session that properly handles security for multiple users.