a) Sequence counter in two phase manner: The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction There might be data conflict during the transaction with...

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Answer 1

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Chapter 25, Problem 2PE

Explanation of Solution

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...

Explanation of Solution

b)

i. Improving the concurrency using counters:

When the transaction abort it does not create any problems and increment operation can be performed easily on the counter.

It cannot retain its original position during an abort. But it remains as it stands.

So, there might be gaps in the sequence number as the counter cannot be restored to its previous value.

These values are assigned to its aborted transactions.

ii. Gaps in sequence numbers:

For example assume the counter value which cannot restore to its previous value during transactions...

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Answer 2

Expert Solution & Answer

Chapter 25, Problem 2PE

Explanation of Solution

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...

Explanation of Solution

b)

i. Improving the concurrency using counters:

When the transaction abort it does not create any problems and increment operation can be performed easily on the counter.

It cannot retain its original position during an abort. But it remains as it stands.

So, there might be gaps in the sequence number as the counter cannot be restored to its previous value.

These values are assigned to its aborted transactions.

ii. Gaps in sequence numbers:

For example assume the counter value which cannot restore to its previous value during transactions...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 3

Expert Solution & Answer

Chapter 25, Problem 2PE

Explanation of Solution

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...

Explanation of Solution

b)

i. Improving the concurrency using counters:

When the transaction abort it does not create any problems and increment operation can be performed easily on the counter.

It cannot retain its original position during an abort. But it remains as it stands.

So, there might be gaps in the sequence number as the counter cannot be restored to its previous value.

These values are assigned to its aborted transactions.

ii. Gaps in sequence numbers:

For example assume the counter value which cannot restore to its previous value during transactions...

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 4

Expert Solution & Answer

Chapter 25, Problem 2PE

Explanation of Solution

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...

Explanation of Solution

b)

i. Improving the concurrency using counters:

When the transaction abort it does not create any problems and increment operation can be performed easily on the counter.

It cannot retain its original position during an abort. But it remains as it stands.

So, there might be gaps in the sequence number as the counter cannot be restored to its previous value.

These values are assigned to its aborted transactions.

ii. Gaps in sequence numbers:

For example assume the counter value which cannot restore to its previous value during transactions...

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 5

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Answer 6

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Answer 7

Chapter 25, Problem 2PE

Explanation of Solution

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...

Explanation of Solution

b)

i. Improving the concurrency using counters:

When the transaction abort it does not create any problems and increment operation can be performed easily on the counter.

It cannot retain its original position during an abort. But it remains as it stands.

So, there might be gaps in the sequence number as the counter cannot be restored to its previous value.

These values are assigned to its aborted transactions.

ii. Gaps in sequence numbers:

For example assume the counter value which cannot restore to its previous value during transactions...

Answer 8

Chapter 25, Problem 2PE

Explanation of Solution

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...

Answer 9

Chapter 25, Problem 2PE

Explanation of Solution

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...

Answer 10

Explanation of Solution

b)

i. Improving the concurrency using counters:

When the transaction abort it does not create any problems and increment operation can be performed easily on the counter.

It cannot retain its original position during an abort. But it remains as it stands.

So, there might be gaps in the sequence number as the counter cannot be restored to its previous value.

These values are assigned to its aborted transactions.

ii. Gaps in sequence numbers:

For example assume the counter value which cannot restore to its previous value during transactions...

Answer 11

Explanation of Solution

b)

i. Improving the concurrency using counters:

When the transaction abort it does not create any problems and increment operation can be performed easily on the counter.

It cannot retain its original position during an abort. But it remains as it stands.

So, there might be gaps in the sequence number as the counter cannot be restored to its previous value.

These values are assigned to its aborted transactions.

ii. Gaps in sequence numbers:

For example assume the counter value which cannot restore to its previous value during transactions...

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 25 - Prob. 2PE Ch. 25 - Prob. 3PE Ch. 25 - Prob. 5PE Ch. 25 - Prob. 6PE Ch. 25 - Prob. 8PE Ch. 25 - Prob. 9PE Ch. 25 - Prob. 10E Ch. 25 - Prob. 11E Ch. 25 - Prob. 12E Ch. 25 - Prob. 13E

a) Sequence counter in two phase manner: The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction There might be data conflict during the transaction with...

Explanation of Solution

a) Sequence counter in two phase manner: The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction There might be data conflict during the transaction with...

Explanation of Solution

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Chapter 25 Solutions

a)

Sequence counter in two phase manner:

The sequence counter remains locked in two phase in exclusive mode till it acquires the lock from other transaction

There might be data conflict during the transaction with...