Given a system with a hit rate of 90%, a cache access time of 20ns and a memory access time of 200ns. show work
a. calculate the effective access time (eat) for overlapped (parallel) access.
b. calculate the effective access time (eat) for non-overlapped (sequential) access

What type of file does a cookie place on web site visitors' computers so that web site managers can customize their sites to their visitors' preferences?

Which option correctly describes a dbms application? a. software used to manage databases b. software used to organize files and folders c. software used to develop specialized images d. software used to create effective presentations

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)?