7. consider a user who needs to transmit 1.5 gigabytes of data to a server. the user lives in a small town where only dial-up access is available. a bus visits the small town once a day from the closest city, located 150 km away, and stops in front of the user’s house. the bus has a 100-mbps wifi connection. it can collect data from users in rural areas and transfer them to the internet through a 1 gbps link once it gets back to the city. suppose the average speed of the bus is 60 km/h. what is the fastest way the user can transfer the data to the server?

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Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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