a. Assume that the entire of relation R(A, B) fits in the available main memory but relation S(A, C) is too large to fit in the main memory. Find a fast join algorithm, i. e., an algorithm with the lowest number of I/O access, for the natural join of R and S. Justify that your proposed algorithm is the fastest possible join algorithm to compute the natural join of R and S. Next, assume that there is a clustered index on attribute A of relation S. Explain whether or how this will change your answer.

Creating "smart interfaces" in all sectors of industry, government, and the public arena is one of the fastest growing hct areas. these interfaces model, interpret, and analyze such human characteristics as speech, gesture, and vision. the field of biometrics, in which humans authenticate themselves to machines, is an area of considerable interest to hct practitioners. fingerprint scans are one of the most frequently used biometric options, and this article, biometric student identification: practical solutions for accountability & security in schools, makes a case for the implementation of fingerprint scans in schools. critique the article, and answer the following questions: according to the author, what are the main benefits of adopting fingerprint scans in schools for student identification? according to the author, what are the main drawbacks of adopting fingerprint scans in schools for student identification? do you agree with the author's assessment of the pl