Sara is analyzing the conversion data of her video ad campaign in Google Ads. She wants to see a summary of, on average, how many days, ad clicks, and ad impressions it took users to convert a customer. Which report will provide her with this information?

What engine component is shown in the above figure?

What is a point-in-time measurement of system performance?

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)?