Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 13, Problem 1PE
Program Plan Intro
Figure 13.3:
| record 0 | 10101 | Srinivasan | Comp.Sci | 65000 |
| record 1 | 12121 | Wu | Finance | 90000 |
| record 2 | 15151 | Mozart | Music | 40000 |
| record 3 | 98345 | Kim | Elec.Eng | 80000 |
| record 4 | 32343 | El Said | History | 60000 |
| record 5 | 33456 | Gold | Physics | 87000 |
| record 6 | 45565 | Katz | Comp.Sci | 75000 |
| record 7 | 58583 | Califieri | History | 62000 |
| record 8 | 76543 | Singh | Finance | 80000 |
| record 9 | 76766 | Crick | Biology | 72000 |
| record 10 | 83821 | Brandt | Comp.Sci | 92000 |
Expert Solution
Explanation of Solution
a.
Result of the action:
- If record 6 is moved to the place of record 5, an empty space is created at the record 6.
- The record 5 is completely discarded from the structure.
- Again record 7 is moved to the space of record 6. So the information in the record 7 is placed at record 6.
- The structure of file after the action is given below,
| record 0 | 10101 | Srinivasan | Comp.Sci | 65000 |
| record 1 | 12121 | Wu | Finance | 90000 |
| record 2 | 15151 | Mozart | Music | 40000 |
| record 3 | 98345 | Kim | Elec.Eng | 80000 |
| record 4 | 32343 | El Said | History | 60000 |
| record 5 | 45565 | Katz | Comp.Sci | 75000 |
| record 6 | 58583 | Califieri | History | 62000 |
| record 7 | ||||
| record 8 | 76543 | Singh | Finance | 80000 |
| record 9 | 76766 | Crick | Biology | 72000 |
| record 10 | 83821 | Brandt | Comp.Sci | 92000 |
Explanation of Solution
b.
Result of the action:
- If record 7 is moved to the place of record 5, an empty space is created at the record 7.
- The record 5 is completely discarded from the structure.
- The structure of file after the action is given below,
| record 0 | 10101 | Srinivasan | Comp.Sci | 65000 |
| record 1 | 12121 | Wu | Finance | 90000 |
| record 2 | 15151 | Mozart | Music | 40000 |
| record 3 | 98345 | Kim | Elec.Eng | 80000 |
| record 4 | 32343 | El Said | History | 60000 |
| record 5 | 58583 | Califieri | History | 62000 |
| record 6 | 45565 | Katz | Comp.Sci | 75000 |
| record 7 | ||||
| record 8 | 76543 | Singh | Finance | 80000 |
| record 9 | 76766 | Crick | Biology | 72000 |
| record 10 | 83821 | Brandt | Comp.Sci | 92000 |
Explanation of Solution
c.
Result of the action:
- The record 5 is completely discarded from the structure.
- The structure of file after the action is given below,
| record 0 | 10101 | Srinivasan | Comp.Sci | 65000 |
| record 1 | 12121 | Wu | Finance | 90000 |
| record 2 | 15151 | Mozart | Music | 40000 |
| record 3 | 98345 | Kim | Elec.Eng | 80000 |
| record 4 | 32343 | El Said | History | 60000 |
| record 5 | ||||
| record 6 | 45565 | Katz | Comp.Sci | 75000 |
| record 7 | 58583 | Califieri | History | 62000 |
| record 8 | 76543 | Singh | Finance | 80000 |
| record 9 | 76766 | Crick | Biology | 72000 |
| record 10 | 83821 | Brandt | Comp.Sci | 92000 |
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