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Using Table 11.4 as an example, create two alternative access plans. Use the following assumptions: a. There are 8,000 employees. b. There are 4,150 female employees. c. There are 370 employees in area code 615. d. There are 190 female employees in area code 615.

Using Table 11.4 as an example, create two alternative access plans. Use the following assumptions: a. There are 8,000 employees. b. There are 4,150 female employees. c. There are 370 employees in area code 615. d. There are 190 female employees in area code 615.

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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Using Table 11.4 as an example, create two alternative access plans. Use the following assumptions:

a. There are 8,000 employees.

b. There are 4,150 female employees.

c. There are 370 employees in area code 615.

d. There are 190 female employees in area code 615.

TABLE 11.4 COMPARING ACCESS PLANS AND I/O COSTS PLAN STEP OPERATION 1/0 1/0 COST RESULTING TOTAL I/0 OPERATIONS SET ROWS COST A A1 Cartesian product 7,000 + 300 7,300 2,100,000 7,300 (PRODUCT, VENDOR) A2 Select rows in A1 with 2,100,000 2,100,000 7,000 2,107,300 matching vendor codes АЗ Select rows in A2 with 7,000 7,000 1,000 2,114,300 V_STATE = 'FL' Select rows in VENDOR with V_STATE = 'FL' B B1 300 300 10 300 B2 Cartesian Product 7,000 + 10 7,010 70,000 7,310 (PRODUCT, B1) B3 Select rows in B2 with 70,000 70,000 1,000 77,310 matching vendor codes
Transcribed Image Text:TABLE 11.4 COMPARING ACCESS PLANS AND I/O COSTS PLAN STEP OPERATION 1/0 1/0 COST RESULTING TOTAL I/0 OPERATIONS SET ROWS COST A A1 Cartesian product 7,000 + 300 7,300 2,100,000 7,300 (PRODUCT, VENDOR) A2 Select rows in A1 with 2,100,000 2,100,000 7,000 2,107,300 matching vendor codes АЗ Select rows in A2 with 7,000 7,000 1,000 2,114,300 V_STATE = 'FL' Select rows in VENDOR with V_STATE = 'FL' B B1 300 300 10 300 B2 Cartesian Product 7,000 + 10 7,010 70,000 7,310 (PRODUCT, B1) B3 Select rows in B2 with 70,000 70,000 1,000 77,310 matching vendor codes
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