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comp_II_Dw - Birla Institute of Technology Science Pilani...

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Birla Institute of Technology & Science, Pilani Work-Integrated Learning Programmes Division First Semester 2009-2010 Comprehensive Examination (EC-2 Regular) Course No. : SS ZG515 Course Title : DATA WAREHOUSING Nature of Exam : Open Book Weightage : 60% Duration : 3 Hours Date of Exam : 24/10/2009 (AN) Note: 1. Please follow all the Instructions to Candidates given on the cover page of the answer book. 2. All parts of a question should be answered consecutively. Each answer should start from a fresh page. Q.1. Aggregates play an important role in improving query performance in a data warehouse environment. Answer the following questions about aggregates (a) How aggregates are stored in a data warehouse? (b) How queries and applications access these aggregates? (c) What kind of overheads aggregates create on the ETL system? (d) How aggregates compare and contrast with data marts? [3 X 4 = 12] Q.2. In the relational model, views are virtual tables in the sense that physically they do not occupy any space. Suppose we materialize the views so that tuples that qualify for a view
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