:
(), ;
, ;
, ;
, , , , .
, - , , .
.
, .
, , , , .
.
, . . , . .
, .
: .
, . .
:
1) ;
2) ;
3) , , 1, 01, 001 .
() , . . .
|
|
|
1) , . , . - .
, . , .
22. . . .
.
. .
, . . .
. . , .
. , .. .
.
, .
2 .
:
A- (Atomicity)
C (Consistency)
I (Isolation)
D (Durability)
ACID .
, .. .
C , . . .
I , ( )
D .
1
.
N
4 :
1. (select, read)
2. (insert, delete)
3. (role, table)
4. (connect, commit, rollback)
ANSI/ISO commit rollback, ACID.
ommit .
Rollback , .
4 .
1.
2.
3.
4.
21 -. AS .
AS Application Server
DBS RDA
- AS . . AS - ., . . . , . , . . .. . AS- . -. - , , - , - , . .
|
|
|
:
2. CASE-
3. case-.
5.
6. case-
4. CASE -
7. Case -
8
9. . . . - . -.
10.
12. . .
13.
17.
14. -
16.
15.
18. -.
20. -.
23. .
24
25. (middleware) /
27
26. RPC
28 ( ORB)
29.
30.
31
34
33. .
19. - -
1.
11. -
22. . . .
21 -. AS .
:
01.
02. CASE-
03. case-.
04. CASE -
05.
06. case-
07. Case -
08
09. . . . - . -.
10.
11. -
12. . .
13.
14. -
15.
16.
17.
18. -.
19. - -
20. -.
21 -. AS .
22. . . .
23. .
24
25. (middleware) /
26. RPC
27
28 ( ORB)
29.
30.
31
33. .
34
:
| ->17. |
| . . . - . -.->09. |
| ->05. |
| ->34 |
| - ->11. |
| - ->14. |
| -..->21 |
| ->27 |
| ->30. |
| CASE-->02. |
| . . ->12. |
| CASE -->04. |
| ->13. |
| case- ->06. |
| ->31 |
| (middleware) /->25. |
| . ->23. |
| ->10. |
| - - ->19. |
| -. ->20. |
| RPC ->26. |
| ( ORB)->28. |
| ->29. |
| Case - ->07. |
| ->24 |
| ->08 |
| ->01. |
| case-.->03. |
| -. ->18. |
| . .->22. |
| ->16. |
| ->33. |
| ->15. |
|
|
|
