a. A schedule showing the lost update anomaly: T 1 T 2 read(A) ...

Question

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Answer 1

Expert Solution & Answer

Chapter 17, Problem 8PE

Explanation of Solution

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

Explanation of Solution

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

Explanation of Solution

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...

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Answer 2

Expert Solution & Answer

Chapter 17, Problem 8PE

Explanation of Solution

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

Explanation of Solution

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

Explanation of Solution

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 3

Expert Solution & Answer

Chapter 17, Problem 8PE

Explanation of Solution

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

Explanation of Solution

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

Explanation of Solution

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Expert Solution & Answer

Chapter 17, Problem 8PE

Explanation of Solution

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

Explanation of Solution

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

Explanation of Solution

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 5

Expert Solution & Answer

Answer 6

Expert Solution & Answer

Answer 7

Chapter 17, Problem 8PE

Explanation of Solution

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

Explanation of Solution

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

Explanation of Solution

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...

Answer 8

Chapter 17, Problem 8PE

Explanation of Solution

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

Answer 9

Chapter 17, Problem 8PE

Explanation of Solution

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

Answer 10

Explanation of Solution

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

Answer 11

Explanation of Solution

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

Answer 12

Explanation of Solution

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...

Answer 13

Explanation of Solution

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...

Answer 14

Expert Solution & Answer

Answer 15

Expert Solution & Answer

Answer 16

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Answer 17

Ch. 17 - Prob. 1PE Ch. 17 - Prob. 2PE Ch. 17 - Prob. 3PE Ch. 17 - Prob. 4PE Ch. 17 - Prob. 5PE Ch. 17 - Prob. 6PE Ch. 17 - Prob. 7PE Ch. 17 - Prob. 8PE Ch. 17 - Prob. 9PE Ch. 17 - Prob. 10PE

a. A schedule showing the lost update anomaly: T 1 T 2 read(A) ...

Explanation of Solution

a. A schedule showing the lost update anomaly: T1T2 read(A) ...

Explanation of Solution

b. The lost update anomaly in read committed isolation level: T1T2 lock-S(A) read(A) unloack(A) lock-X(A) write(A)

Explanation of Solution

c. Reason for lost update anomaly is not possible with the repeatable read isolation level: The lost update anomaly is not possible in repeatable read isolation level. In repeatable isolation level, a transaction T1 re...

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Chapter 17 Solutions

a.

A schedule showing the lost update anomaly:

T₁ T₂

read(A)
...

b.

The lost update anomaly in read committed isolation level:

T₁ T₂

lock-S(A)

read(A)

unloack(A)

lock-X(A)

write(A)

c.

Reason for lost update anomaly is not possible with the repeatable read isolation level:

The lost update anomaly is not possible in repeatable read isolation level.

In repeatable isolation level, a transaction T1 re...