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Let Q={91.gs) be a set of queries, A= (A₁.....As} be a set of attributes, and S= (S1,S2,S3} be a set of sites. The matrix of Figure 3.21a describes the attribute usage values and the matrix of Figure 3.21b gives the applica- tion access frequencies. Assume that refi(q) = 1 for all q and S, and that A₁ is the key attribute. Use the bond energy and vertical partitioning algorithms to obtain a vertical fragmentation of the set of attributes in A. 9₁ 92 9 94 95 A₁ A₂ A₂ A₂ A₂ 0 1 1 0 1 1 1 0 1 1 0 1 1 0 (a) 1 1 0 1 0 1 0 0 92 9₂ 95 S₁ S₂ S₂ 10 20 0 5 0 10 0 35 5 0 10 0 0 15 0 G

Let Q={91.gs) be a set of queries, A= (A₁.....As} be a set of attributes, and S= (S1,S2,S3} be a set of sites. The matrix of Figure 3.21a describes the attribute usage values and the matrix of Figure 3.21b gives the applica- tion access frequencies. Assume that refi(q) = 1 for all q and S, and that A₁ is the key attribute. Use the bond energy and vertical partitioning algorithms to obtain a vertical fragmentation of the set of attributes in A. 9₁ 92 9 94 95 A₁ A₂ A₂ A₂ A₂ 0 1 1 0 1 1 1 0 1 1 0 1 1 0 (a) 1 1 0 1 0 1 0 0 92 9₂ 95 S₁ S₂ S₂ 10 20 0 5 0 10 0 35 5 0 10 0 0 15 0 G

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Let Q = {q1...gs} be a set of queries, A = {A1..As} be a set of attributes, and S= {S1,S2,S3} be a set of sites. The matrix of Figure 3.2la describes the attribute usage values and the matrix of Figure 3.21b gives the applica- tion access frequencies. Assume that re fi(q) = 1 for all q and S, and that Aj is the key attribute. Use the bond energy and vertical partitioning algorithms to obtain a vertical fragmentation of the set of attributes in A. A, A A, A As s, s, s, 10 20 92 1 1 1 0 5. 0 10 O 35 10 95 O 15 (a) (b)
Transcribed Image Text:Let Q = {q1...gs} be a set of queries, A = {A1..As} be a set of attributes, and S= {S1,S2,S3} be a set of sites. The matrix of Figure 3.2la describes the attribute usage values and the matrix of Figure 3.21b gives the applica- tion access frequencies. Assume that re fi(q) = 1 for all q and S, and that Aj is the key attribute. Use the bond energy and vertical partitioning algorithms to obtain a vertical fragmentation of the set of attributes in A. A, A A, A As s, s, s, 10 20 92 1 1 1 0 5. 0 10 O 35 10 95 O 15 (a) (b)
Let Q = {q1...gs} be a set of queries, A = {A1..As} be a set of attributes, and S= {S1,S2,S3} be a set of sites. The matrix of Figure 3.2la describes the attribute usage values and the matrix of Figure 3.21b gives the applica- tion access frequencies. Assume that re fi(q) = 1 for all q and S, and that Aj is the key attribute. Use the bond energy and vertical partitioning algorithms to obtain a vertical fragmentation of the set of attributes in A. A, A A, A As s, s, s, 10 20 92 1 1 1 0 5. 0 10 O 35 10 95 O 15 (a) (b)
Transcribed Image Text:Let Q = {q1...gs} be a set of queries, A = {A1..As} be a set of attributes, and S= {S1,S2,S3} be a set of sites. The matrix of Figure 3.2la describes the attribute usage values and the matrix of Figure 3.21b gives the applica- tion access frequencies. Assume that re fi(q) = 1 for all q and S, and that Aj is the key attribute. Use the bond energy and vertical partitioning algorithms to obtain a vertical fragmentation of the set of attributes in A. A, A A, A As s, s, s, 10 20 92 1 1 1 0 5. 0 10 O 35 10 95 O 15 (a) (b)
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