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Suppose we have a stream of tuples with the schema
Assume universities are unique, but a course ID is unique only within a university (i.e., different universities may have different courses with the same ID, e.g., "CS101") and likewise, student ID's are unique only within a university (different universities may assign the same ID to different students). Suppose we want to answer certain queries approximately from a 1/20th sample of the data. For each of the queries below, indicate how you would construct the sample. That is, tell what the key attributes should be.
(a) For each university, estimate the average number of students in a course.
(b) Estimate the fraction of students who have a GPA of 3.5 or more.
(c) Estimate the fraction of courses where at least half the students got "A."
From the constant-growth model, the amount of internally-funded growth is 12.5% and a maximum P/E ratio of 20 would be paid for Merck under these circumstances.
Discuss the different types of transaction failures. What is meant by catastrophic failure?
Compare the benefits of the virtualization computing technology with past successful or unsuccessful telecommunications technologies you have in place. With four references.
Instructions: The proliferation of mobility and mobile applications in enterprise networks has increased the importance of mobile VPNs to provide secure communication channels to support mobile users in a wide variety of organizations
These flows all have the same (maximal) value, but their costs (the sum of the products of edge flows and edge costs) differ. The maxflow in the center has minimal cost (no maxflow has lower cost).
Analyze the following statement: "Using the faster processor chip results in corresponding increase in performance of a computer even if main memory speed remains same."
In the current design model of IT service provision at NSI, the service desk function is provided in-house by TAFE employees. Consider the option of outsourcing the service desk.
Describe and contrast maintenance and validation techniques.
Determine the smallest lever force P needed to prevent the wheel from rotating if it is subjected to a torque of M = 250 N .m The coefficient of static friction between the belt and the wheel is µs = 0.3.
If the order of incrementation in T2 were reversed [i.e., inc2 (B) followed by inc2 {A)], how many serializable interleavings would there be?
Two instance variables
Consider a device of 50MBPS is operated in cycle stealing mode of DMA as and when 8byte word is available. It is transferred into the memory in 40ns. What is the percentage of time processor is blocked due to DMA.
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