
GDB Woche 14
Quiz
•
Computers
•
University
•
Practice Problem
•
Hard
Nomiez Nomiez
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7 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Welcher Fehler könnte hier entstehen?
Phantom Problem
Non-repeatable Read
Dirty Read
Lost Update
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Wie viele Transaktionen existieren in der folgenden Historie?
H := r3[x], r3[x], r2[x], r3[x], w1[x], c1, c3, w4[x], a4, r2[x], c2
1
2
3
4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Wie viele Transaktionen beenden mit erfolgreichem Ausführen?
H := r3[x], r3[x], r2[x], r3[x], w1[x], c1, c3, w4[x], a4, r2[x], c2
1
2
3
4
4.
MULTIPLE SELECT QUESTION
1 min • 1 pt
Welche unten aufgeführten Operationen sind Konfliktoperationen:
H := r3[x], r3[x], r2[x], r3[x], w1[x], c1, c3, w4[x], a4, r2[x], c2
r3[x] < w1[x]
r3[x] < w4[x]
w1[x] < w4[x]
r2[x] < w4[x]
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Was sind lesende Transaktionen:
H := r3[x], r3[x], r2[x], r3[x], w1[x], c1, c3, w4[x], a4, r2[x], c2
T1 liest von T3
T2 liest von T1
T4 liest von T1
T3 liest von T1
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Was ist der korrekte Serialisierbarkeitsgraph SG(H) mit
H := r3[x], r3[x], r2[x], r3[x], w1[x], c1, c3, w4[x], a4, r2[x], c2
7.
MULTIPLE SELECT QUESTION
1 min • 1 pt
Was sind die Eigenschaften von Eigenschaften von
H := r3[x], r3[x], r2[x], r3[x], w1[x], c1, c3, w4[x], a4, r2[x], c2
serialisierbar
rücksetzbar
vermeidet kaskadierendes Rücksetzen
strikt
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