The difference between a checked and an unchecked exception is:
a) checked exceptions need not be listed in a throws clause
b) unchecked exceptions must be listed in a throws clause
c) neither kind of exception follows the rules of exception propagation
d) an unchecked exception requires no throws clause
e) a checked exception always must be caught by a try block; an unchecked exception does not

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)?

Alcohol’s affects on the cornea and lens of the eye make it more difficult

What is one potential problem associated with an organization purchasing new technology early in its lifecycle