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Computers and Technology, 23.06.2019 10:20
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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Computers and Technology, 25.06.2019 07:50
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Computers and Technology, 25.06.2019 18:30
Which type of navigation involves multiple frames that are linked to a number of other frames? a) bread crumbs b) linear c) reciprocal d) web which type of navigation is similar to a book because users can move back and forth between frames? a) hierarchical b) linear c) reciprocal d) sequential how many items should a menu system have? a) 1-3 b) 5-8 c) 9-11 d) 13-18
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