Relevance Using Hyperlinks(Cont.) Connections to social networking theories that ranked prestige of people E.g.the president of the U.S.A has a high prestige since many people know him Someone known by multiple prestigious people has high prestige Hub and authority based ranking A hub is a page that stores links to many pages(on a topic) An authority is a page that contains actual information on a topic Each page gets a hub prestige based on prestige of authorities that it points to Each page gets an authority prestige based on prestige of hubs that point to it Again,prestige definitions are cyclic,and can be got by solving linear equations Use authority prestige when ranking answers to a query Database System Concepts-5th Edition,Sep 2,2005 19.11 @Silberschatz,Korth and SudarshanDatabase System Concepts - 5 19.11 ©Silberschatz, Korth and Sudarshan th Edition, Sep 2, 2005 Relevance Using Hyperlinks (Cont.) Connections to social networking theories that ranked prestige of people E.g. the president of the U.S.A has a high prestige since many people know him Someone known by multiple prestigious people has high prestige Hub and authority based ranking A hub is a page that stores links to many pages (on a topic) An authority is a page that contains actual information on a topic Each page gets a hub prestige based on prestige of authorities that it points to Each page gets an authority prestige based on prestige of hubs that point to it Again, prestige definitions are cyclic, and can be got by solving linear equations Use authority prestige when ranking answers to a query