1 Database Systems: Design, Implementation, and Management CHAPTER 6 Database Design.
Chapter 3 Design and Implementation
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Transcript of Chapter 3 Design and Implementation
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8/16/2019 Chapter 3 Design and Implementation
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C 3 D I A J
C 3 D I
3.1 B B B FM
FM A ,
. F 3.1 FM
.
F 3.1 B B FM
3.2 B B F
3.2.1 E / M ( )
;
.
.
3.2.2 F M ( )
F F . I
; .
3.2.3
.
.
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8/16/2019 Chapter 3 Design and Implementation
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C 3 D I A J
3.3 M
M . (), , (), ().
.
D
A .
.
, ( FE)
,
().
()
100 . IGFE (
1.5 1K )
.
3.4
I FM ,
F .B ()
() ().
1 2KH. A ,
, . A
, ,
.
3.5
.
.
. A 1MH C (
) H ( ) .
A LC
( ). B
3600. I
LC (
)
B
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8/16/2019 Chapter 3 Design and Implementation
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C 3 D I A J
, LC (L1, C1 & C2)
(C)
. F G * L =
C2 / C1. 1/2 * (LC)1/2
C = C1*C2/C1+C2.
3.6 M
FM
.
. I
FM , ( )
. .
.
. CD
= C / (1+2)1/2; C .
A LC : .
. A
,
. A
,
.
L :
M : ( ) M
FM = 1 / 2*(L(C1+CM)1/2 M .
FMI = 1 / 2*(L(C1+CMA)1/2
FM = 1 / 2*(L(C1+CM)1/2
,
.
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C 3 D I A J
3.7 B A
. ,
L C . H
L .
L ,
.
3.8 F M
F
, LC , ,
(.
) . A
1%.
, ,
.
+75K. F
, F , .
LC .
(. *2), ,
. LC
, . F1, 2F1, (1)1,
F0=F1.
, D
(D) : .
1/ 1/2
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( ) , .
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C 3 D I A J
, ,
CC
.
3.9 D A
, .
, ( )
. B
.
3.10 A
DC AC
.
. F ,
C C B
.
.