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Technologies for Information Systems Part I (10 points) prof. L. Tanca – September 8th, 2017 Available time: 25 minutes Last Name _________________________________________________________________ First Name ________________________________________________________________ Student ID ________________ Signature_______________________________________ 1. Describe the GAV (global as view) and LAV (local as view) approaches used to define the mapping between the global logical schema and the single source schemata in the data integration context. Discuss the main differences between the two approaches and describe under which conditions GAV is more appropriate than LAV, and vice versa. (5 points) 2. Briefly define pervasive data m anagement and the main problems that must be solved. (5 points)  During this part of the exam, students are not allowed to consult books or notes.  Students should answer the theoretical questions using their own words, in order for the teachers to be able to assess their real level of understanding. Technologies for Information Systems Part II (22 points) prof. L. Tanca – September 8th, 2017 Available time: 2h 00m Last Name _________________________________________________________________ First Name ________________________________________________________________ Student ID ________________ Signature_______________________________________ PoliConferences is a company organizing scientific conferences. The conferences are grouped in series, and for each series the re is a conference in each year. Users may register to participate in conferences, and e ach conference defines some registration categories, each associated with its own price. The users register to the conferences selecti ng a specific registration category, and pay an amount depending…