Full exam for Technologies for Information Systems in the Computer Engineering degree programme at Politecnico di Milano. The document covers: Technologies for Information Systems Part I (10 points) prof. L. Tanca – June 22nd, 2018 Available time: 25 minutes Last Name _________________________________________________________________ First Name ________________________________________________________________ Student ID
Full exam for Technologies for Information Systems in the Computer Engineering degree programme at Politecnico di Milano. The document covers: Technologies for Information Systems Part I (10 points) prof. L. Tanca – June 22nd, 2018 Available time: 25 minutes Last Name _________________________________________________________________ First Name ________________________________________________________________ Student ID
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Technologies for Information Systems Part I (10 points) prof. L. Tanca – June 22nd, 2018 Available time: 25 minutes Last Name _________________________________________________________________ First Name ________________________________________________________________ Student ID ________________ Signature_______________________________________ 1. Define the concepts of valid time and transaction time in temporal databases also describing their advantages and disadvantages. 2. Describe what we mean by "lightweight approaches to data integration", using as an example the Mashup technique, and explain in which circumstances these approaches are appropriate, with advantages and disadvantages. • During this part of the exam, students are not allowed to use 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 (23 points) prof. L. Tanca – June 22nd, 2018 Available time: 2h 00m Last Name _________________________________________________________________ First Name ________________________________________________________________ Student ID ________________ Signature_______________________________________ PoliScience is a platform offering the online purchase and download of scientific journal papers in electronic format. Registered users can access the platform and download papers by paying a fee. Note that the system charges every download, so if a user wishes to downolad again a paper he/she has already downloaded in the past, he/she is required to pay the fee again. The management of PoliScience has now hired you to design a data warehouse to analyze the downloads performed by the users. The following is the schema…
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