Question: 3. Consider two relations r (200 blocks) and s (30 blocks) a. What is the cost of performing a block nested-loop join, given that we

3. Consider two relations r (200 blocks) and s (30 blocks)

a. What is the cost of performing a block nested-loop join, given that we have 8 memory blocks?

b. Reverse the inner and outer relation from part a) and compute block nested-loop join again. Is the resulting cost higher or lower?

c. What if we had 35 blocks of memory available instead of 8 what would be the cost of block nested-loop join?

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

Q:

Consider two relations r (200 blocks) and s (20 blocks) a) What is the cost of performing a block nested-loop join, given that we have 7 memory blocks? b) Reverse the inner and outer relation from...

Q:

2 Operator Algorithms 2. (15 points) Consider two relations R and S with the following sizes: Relation Blocks # Tuples R 100 1000 S 80 800 (a) (5 points) Compute the cost of joining these two...

Q:

Relations from the previous question: Consider two relations R and S with the following sizes: Relation R: # Blocks = 100 # Tuples = 1000 Relation S: # Blocks = 80 # Tuples = 800 3 Multi-Pass...

Q:

In class, we developed a cost model for various relational database operations, such as joins. We counted the total number of I / Os ( i . e . , writing or reading a disk page ) required to perform...

Q:

Question 3 . [ 1 5 marks ] You are given the following information: The available memory contains 5 5 blocks. Relations branch and account are stored as sequential files in the hard disk. branch and...

Q:

You are given the following information: The available memory contains 5 5 blocks. Relations BRANCH and ACCOUNT are stored as sequential files in the hard disk. BRANCH and ACCOUNT occupy 2 2 0 0 and...

Q:

Problem 4 ( 1 0 Points ) : Assume relations R ( A , B , C ) and S ( C , D , E ) with the following properties. R has 2 0 , 0 0 0 tuples and 2 5 tuples fit in a block. S has 4 5 , 0 0 0 tuples and 3 0...

Q:

Determine the number of block accesses (reads and writes) for joining two relations r and s using block nested-loop join technique. Use the most efficient way. Justify your answer. Use the following...

Q:

PART A) Two relations R and S are having their bag-union taken by a sort-based algorithm. We have already sorted R and S , and we assume that their tuples are simply integers, 1 through 5. We also...

Q:

Consider the natural join of the relation R(A, B)and S(A, C)on attribute A. Assume that R and S have 80000 and 20000 blocks, respectively and there are 10 buffer blocks available in the main memory....

Q:

A highway curve has a radius of 825 m. At what angle should the road be banked so that a car traveling at 26.8 m/s (60 mph) has no tendency to skid sideways on the road?

Q:

A person jumps off a diving board 4.0m above the waters surface into a deep pool. The persons downward motion stops 2.0m below the surface of the water. Estimate the average deceleration of the...

Q:

Otto, Chris, and George, the three partners in a landscaping business, have executed a cross purchase buy - sell agreement and want to purchase life insurance to fund it . How many e insurance...

Q:

"Epstein Ple' is planning to make a new investment and prior that the firm wants to estimate the cost of capital. We have the following inform Common shares The market capitalization is $31.4...

Q:

2. Assess the management, organization, and technology factors that have created this problem. In July 2010, reports surfaced about a Stuxnet worm that had been targeting Irans nuclear facilities. In...

Q:

8-5 Security isnt simply a technology issue, its a business issue. Discuss.

Q:

2. What is the possible business impact of this security breach for both MWEB and its customers? BMWEB, launched in 1997, became South Africas leading ISP in 1998. It has established itself as a...