After a unique clustered index is created on the view, the view's result set is materialized immediately and persisted in physical storage in the database, saving the overhead of performing this costly operation at execution time.
You can check the link below for your answers
http://msdn.microsoft.com/en-us/library/dd171921%28v=sql.100%29.aspx
How to post data/code on a forum to get the best help - Jeff Moden
http://www.sqlservercentral.com/articles/Best+Practices/61537/