a. Example of a schedule using pred_read operation: The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict. Suppose the given additional operation pred_read(r, P) on relation r with predicate P. Consider the example of a schedule which depicts the phantom phenomena: T 1 T 2 pred_read(t, P) insert(r) write(B) commit read(B) comm...

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Answer 1

Expert Solution & Answer

Chapter 17, Problem 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T₁ T₂
pred_read(t, P)

insert(r)

write(B)

commit

read(B)

comm...

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...

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Q2/find the transfer function C/R for the system shown in the figure Re ད

Answer 2

Expert Solution & Answer

Chapter 17, Problem 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T₁ T₂
pred_read(t, P)

insert(r)

write(B)

commit

read(B)

comm...

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 3

Expert Solution & Answer

Chapter 17, Problem 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T₁ T₂
pred_read(t, P)

insert(r)

write(B)

commit

read(B)

comm...

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Expert Solution & Answer

Chapter 17, Problem 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T₁ T₂
pred_read(t, P)

insert(r)

write(B)

commit

read(B)

comm...

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...

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 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T₁ T₂
pred_read(t, P)

insert(r)

write(B)

commit

read(B)

comm...

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...

Answer 8

Chapter 17, Problem 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T₁ T₂
pred_read(t, P)

insert(r)

write(B)

commit

read(B)

comm...

Answer 9

Chapter 17, Problem 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T₁ T₂
pred_read(t, P)

insert(r)

write(B)

commit

read(B)

comm...

Answer 10

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...

Answer 11

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...

Answer 12

Expert Solution & Answer

Answer 13

Expert Solution & Answer

Answer 14

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Answer 15

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

T₁	T₂
pred_read(t, P)
	insert(r) write(B) commit
read(B) comm...

Explanation of Solution

Explanation of Solution

b. Example of a schedule: Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited: T1T2pred_read(t, t...

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Chapter 17 Solutions

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T₁ T₂
pred_read(t, t...