Let R(A, B, C, D, E) be a relation which has 500000 records. Size of each record is 200 B. Size of attribute A is 16 B. Size of pointer is 4 B and size of the block is 2400 B (assume elements are stored in sorted order of key).
On the execution of the query,
Select ∗ from R where A = ‘GATE’
The difference of the cost in term of number of block transfer from the disk when multilevel index used and when binary search applied without indexing is _______.