The amount of data that can be stored on a disk depends in part on. a.
the number of tracks on the disk
b.
the thickness of the magnetic coating
c.
none of the above
d.
the rotational speed of the disk

The qwerty keyboard is the most common layout of keys on a keyboard

In my email i got a message it says a quick message and in message details on who its from its says nicole and under nicole is [email protected] -

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)?