Write an equivalent expression in relational algebra for the following SQL query:
SELECT P.Name, C.Name
FROM Professor P, Course C, Taught T
WHERE P.Id = T.ProfId AND T.Semester = ’S2002’
AND T.CrsCode = C.CrsCode
?Professor.Name,Course.Name (
?Semester='S2002' (
Professor Id=ProfId Taught CrsCode=CrsCode Course))
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You have a CISC architecture that employs bit field instructions to perform some very clever graphical operations on image data. These bit field instructions account for 5% of the code executed. However, the bit field instructions increase the cost of the silicon die by 20% and prevent the use of advanced pipelining and microarchitectural techniques. If the bit field instructions are dropped, the chip can operate at twice the rate. Typically, a bit field instruction can be replaced by seven conventional machine?level instructions. Would you advise keeping or getting rid of bit field instructions?
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