a. Problem occurred when rolling back first transaction: Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction. In case, if the first transaction needs to be rolled back, then The record deleted by the first transaction is restored. When the usual physical manner undo is performed with the old record values; The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

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Answer 1

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Chapter 19, Problem 9PE

Explanation of Solution

a.

Problem occurred when rolling back first transaction:

Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction.

In case, if the first transaction needs to be rolled back, then

The record deleted by the first transaction is restored.

When the usual physical manner undo is performed with the old record values;

The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

Explanation of Solution

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...

Explanation of Solution

c.

Solving the problem:

In order to resolve the problem using tuple-locking the following methods are followed:

Defer the freeing up of space until a transaction commit.

Here, ensure that the space will be freed even when a system fails just after the commit.

For this, the log records are modified for including the information about the space being freed, which should have been performed after the commit.

In fact, all such operations can be performed as a transaction along generating their log records, followed by the post-commit log records...

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Check out a sample textbook solution

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1.[30 pts] Computers generate color pictures on a video screen or liquid crystal display by mixing three different colors of light: red, green, and blue. Imagine a simple scheme, with three different lights, each of which can be turned on or off, projecting onto a glass screen: We can create eight different colors based on the absence (0) or presence (1) of light sources R,G and B: R G B Color 0 0 0 Black 0 0 1 Blue 0 1 0 Green 0 1 1 Cyan 1 0 0 Red 1 0 1 Magenta 1 1 1 0 Yellow 1 White 1 Each of these colors can be represented as a bit vector of length 3, and we can apply Boolean operations to them. a. The complement of a color is formed by turning off the lights that are on and turning on the lights that are off. What would be the complement of each of the eight colors listed above? b. Describe the effect of applying Boolean operations on the following colors: Λ 1. Red(100) ^ Magenta(101)= Blue(001) 2. Bue(001) | Green(010)= 3. Yellow(100) & Cyan(011)= 2.[30 pts] Perform the following…

D. S. Malik, Data Structures Using C++, 2nd Edition, 2010

Answer 2

Expert Solution & Answer

Chapter 19, Problem 9PE

Explanation of Solution

a.

Problem occurred when rolling back first transaction:

Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction.

In case, if the first transaction needs to be rolled back, then

The record deleted by the first transaction is restored.

When the usual physical manner undo is performed with the old record values;

The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

Explanation of Solution

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...

Explanation of Solution

c.

Solving the problem:

In order to resolve the problem using tuple-locking the following methods are followed:

Defer the freeing up of space until a transaction commit.

Here, ensure that the space will be freed even when a system fails just after the commit.

For this, the log records are modified for including the information about the space being freed, which should have been performed after the commit.

In fact, all such operations can be performed as a transaction along generating their log records, followed by the post-commit log records...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 3

Expert Solution & Answer

Chapter 19, Problem 9PE

Explanation of Solution

a.

Problem occurred when rolling back first transaction:

Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction.

In case, if the first transaction needs to be rolled back, then

The record deleted by the first transaction is restored.

When the usual physical manner undo is performed with the old record values;

The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

Explanation of Solution

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...

Explanation of Solution

c.

Solving the problem:

In order to resolve the problem using tuple-locking the following methods are followed:

Defer the freeing up of space until a transaction commit.

Here, ensure that the space will be freed even when a system fails just after the commit.

For this, the log records are modified for including the information about the space being freed, which should have been performed after the commit.

In fact, all such operations can be performed as a transaction along generating their log records, followed by the post-commit log records...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 4

Expert Solution & Answer

Chapter 19, Problem 9PE

Explanation of Solution

a.

Problem occurred when rolling back first transaction:

Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction.

In case, if the first transaction needs to be rolled back, then

The record deleted by the first transaction is restored.

When the usual physical manner undo is performed with the old record values;

The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

Explanation of Solution

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...

Explanation of Solution

c.

Solving the problem:

In order to resolve the problem using tuple-locking the following methods are followed:

Defer the freeing up of space until a transaction commit.

Here, ensure that the space will be freed even when a system fails just after the commit.

For this, the log records are modified for including the information about the space being freed, which should have been performed after the commit.

In fact, all such operations can be performed as a transaction along generating their log records, followed by the post-commit log records...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 5

Expert Solution & Answer

Answer 6

Expert Solution & Answer

Answer 7

Chapter 19, Problem 9PE

Explanation of Solution

a.

Problem occurred when rolling back first transaction:

Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction.

In case, if the first transaction needs to be rolled back, then

The record deleted by the first transaction is restored.

When the usual physical manner undo is performed with the old record values;

The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

Explanation of Solution

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...

Explanation of Solution

c.

Solving the problem:

In order to resolve the problem using tuple-locking the following methods are followed:

Defer the freeing up of space until a transaction commit.

Here, ensure that the space will be freed even when a system fails just after the commit.

For this, the log records are modified for including the information about the space being freed, which should have been performed after the commit.

In fact, all such operations can be performed as a transaction along generating their log records, followed by the post-commit log records...

Answer 8

Chapter 19, Problem 9PE

Explanation of Solution

a.

Problem occurred when rolling back first transaction:

Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction.

In case, if the first transaction needs to be rolled back, then

The record deleted by the first transaction is restored.

When the usual physical manner undo is performed with the old record values;

The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

Answer 9

Chapter 19, Problem 9PE

Explanation of Solution

a.

Problem occurred when rolling back first transaction:

Consider the given case where another transaction takes up the space generated by the deletion of a record by an uncommitted transaction.

In case, if the first transaction needs to be rolled back, then

The record deleted by the first transaction is restored.

When the usual physical manner undo is performed with the old record values;

The space that was reallocated to the new record by the second transaction would get overwritten by this undo...

Answer 10

Explanation of Solution

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...

Answer 11

Explanation of Solution

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...

Answer 12

Explanation of Solution

c.

Solving the problem:

In order to resolve the problem using tuple-locking the following methods are followed:

Defer the freeing up of space until a transaction commit.

Here, ensure that the space will be freed even when a system fails just after the commit.

For this, the log records are modified for including the information about the space being freed, which should have been performed after the commit.

In fact, all such operations can be performed as a transaction along generating their log records, followed by the post-commit log records...

Answer 13

Explanation of Solution

c.

Solving the problem:

In order to resolve the problem using tuple-locking the following methods are followed:

Defer the freeing up of space until a transaction commit.

Here, ensure that the space will be freed even when a system fails just after the commit.

For this, the log records are modified for including the information about the space being freed, which should have been performed after the commit.

In fact, all such operations can be performed as a transaction along generating their log records, followed by the post-commit log records...

Answer 14

Expert Solution & Answer

Answer 15

Expert Solution & Answer

Answer 16

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Answer 17

Ch. 19 - Prob. 1PE Ch. 19 - Prob. 2PE Ch. 19 - Prob. 3PE Ch. 19 - Prob. 4PE Ch. 19 - Prob. 5PE Ch. 19 - Prob. 6PE Ch. 19 - Prob. 7PE Ch. 19 - Prob. 8PE Ch. 19 - Prob. 9PE Ch. 19 - Prob. 10PE

Explanation of Solution

Explanation of Solution

b. Issues: When page-level locking is used, this problem will not crop up because of the following reasons: The free space gener...

Explanation of Solution

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Chapter 19 Solutions

b.

Issues:

When page-level locking is used, this problem will not crop up because of the following reasons:

The free space gener...