Which of the following types of memory extends the actual physical memory of a computer by copying blocks of data from the memory to a drive?

a. block
b. read-only
c. disk
d. paged

How does a policy manual an organization? a. it boost productivity. b. it create awareness in employees about the organization’s values. c. it employees achieve targets. d. it safeguards the organization from liabilities.

Research data that is presented using descriptive language is said to be

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)?