Explain why it's important to classify data in an organization. include how it can be done initially and how it should be maintained. also discuss what data needs to be classified.

The egyptians invented the ? to water their crops, and may have used the ? to build the pyramids.

Amedian in the road will be marked with a white sign that has a black arrow going to the left of the median. true false

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)?