CNC-312 Foundations of Information Systems Lec 5: Transaction Management Overview

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Which of the following best describes the concept of 'Atomicity' in the context of transactions?

Only a subset of actions in the transaction are executed

Either all actions of the transaction are executed or none at all (correct)

All actions of the transaction are executed in any order

Some actions of the transaction may be executed while others are not

What does the 'Isolation' property ensure in the context of transactions?

Transactions are allowed to directly modify data from other transactions

Transactions have no impact on the overall database consistency

Transactions are guaranteed to be executed in a serial manner

Transactions are protected from effects of concurrently running transactions (correct)

What is the primary role of the DBMS in achieving concurrency for transactions?

Allowing transactions to directly modify database objects

Interleaving actions of various transactions to achieve the same effect as serial execution (correct)

Preventing multiple transactions from executing at the same time

Enforcing a strict serial execution of transactions

In the context of transactions, what does 'Durability' ensure?

Effects of committed transactions must persist and overcome any system failure Signup and view all the answers

How does the 'Consistency' property relate to a transaction's impact on the database state?

A transaction must leave the database in a consistent state upon completion Signup and view all the answers

What is the DBMS's primary concern with regard to a user's program involving transactions?

The data read/written from/to the database during the user's program Signup and view all the answers

What is the main purpose of the DBMS log in relation to atomicity?

To record all actions, allowing the DBMS to undo actions of aborted transactions. Signup and view all the answers

What is the primary role of durability in a DBMS?

Ensure that committed actions are written to disk or can be redone if not yet written to disk in case of a crash. Signup and view all the answers

What is the purpose of concurrent execution of user programs in a DBMS?

To increase system throughput by overlapping I/O and CPU operations. Signup and view all the answers

What is the characteristic of a serial schedule in DBMS?

It does not interleave the actions of different transactions. Signup and view all the answers

What defines a serializable schedule in a DBMS?

A schedule that is equivalent to some serial execution of the transactions on any consistent database instance. Signup and view all the answers

Why is concurrent execution of transactions important for good DBMS performance?

It increases system throughput by overlapping I/O and CPU operations. Signup and view all the answers

In the context of concurrency control, what does a schedule refer to?

A list of actions from a set of transactions as seen by the DBMS. Signup and view all the answers

What is the primary goal of scheduling transactions in a DBMS?

To create an actual or potential execution sequence while maintaining consistency. Signup and view all the answers

What is the significance of equivalent schedules in a DBMS?

They guarantee that the effect of executing one schedule is identical to the effect of executing another schedule for any database state. Signup and view all the answers

What represents a major challenge for a DBMS during concurrent execution of transactions?

Coping with effects of interleaving transactions (Concurrency control). Signup and view all the answers

What role does the DBMS log play in ensuring atomicity during transaction processing?

To record all actions, allowing the DBMS to undo actions of aborted transactions. Signup and view all the answers

Which property of a transaction ensures that the effects of committed transactions must persist and overcome any system failure?

Durability Signup and view all the answers

In the context of transactions, which property protects a transaction from the effects of concurrently running transactions?

Isolation Signup and view all the answers

What is the primary concern of the DBMS in achieving concurrency for transactions?

Managing scheduling Signup and view all the answers

Which characteristic of a transaction ensures that either all actions of the transaction are executed or none at all?

Atomicity Signup and view all the answers

What is the significance of equivalent schedules in a DBMS?

They produce the same net effect as serial execution of transactions. Signup and view all the answers

In the context of scheduling transactions in a DBMS, what represents a major challenge during concurrent execution?

Preventing transaction interference Signup and view all the answers

Which feature of the DBMS ensures that committed actions are written to disk or, in case of a crash, the system must redo actions of committed transactions which were not yet written to disk?

Durability Signup and view all the answers

What is the primary reason for the DBMS to log all actions of a transaction?

To ensure atomicity of transactions Signup and view all the answers

In the context of concurrent execution of transactions, what is the main purpose of overlapping I/O and CPU operations?

Improving system throughput Signup and view all the answers

Which characteristic defines a serializable schedule in a DBMS?

Equivalent to some serial execution of the transactions on any consistent database instance Signup and view all the answers

What represents a major challenge for a DBMS during concurrent execution of transactions?

Handling interleaving transactions Signup and view all the answers

What is the primary role of concurrency control in a DBMS?

Ensuring data consistency Signup and view all the answers

In the context of transactions, what does 'Atomicity' ensure?

All or nothing transaction processing Signup and view all the answers

What is the main reason for maintaining equivalent schedules in a DBMS?

Ensuring database consistency Signup and view all the answers

What role does the DBMS log play in ensuring atomicity during transaction processing?

Undoing actions of aborted transactions Signup and view all the answers

In the context of concurrency control, what does a schedule refer to?

A list of actions from a set of transactions as seen by DBMS Signup and view all the answers

CNC-312 Foundations of Information Systems Lec 5: Transaction Management Overview

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Questions and Answers

Which of the following best describes the concept of 'Atomicity' in the context of transactions?

What does the 'Isolation' property ensure in the context of transactions?

What is the primary role of the DBMS in achieving concurrency for transactions?

In the context of transactions, what does 'Durability' ensure?

How does the 'Consistency' property relate to a transaction's impact on the database state?

What is the DBMS's primary concern with regard to a user's program involving transactions?

What is the main purpose of the DBMS log in relation to atomicity?

What is the primary role of durability in a DBMS?

What is the purpose of concurrent execution of user programs in a DBMS?

What is the characteristic of a serial schedule in DBMS?

What defines a serializable schedule in a DBMS?

Why is concurrent execution of transactions important for good DBMS performance?

In the context of concurrency control, what does a schedule refer to?

What is the primary goal of scheduling transactions in a DBMS?

What is the significance of equivalent schedules in a DBMS?

What represents a major challenge for a DBMS during concurrent execution of transactions?

What role does the DBMS log play in ensuring atomicity during transaction processing?

Which property of a transaction ensures that the effects of committed transactions must persist and overcome any system failure?

In the context of transactions, which property protects a transaction from the effects of concurrently running transactions?

What is the primary concern of the DBMS in achieving concurrency for transactions?

Which characteristic of a transaction ensures that either all actions of the transaction are executed or none at all?

What is the significance of equivalent schedules in a DBMS?

In the context of scheduling transactions in a DBMS, what represents a major challenge during concurrent execution?

Which feature of the DBMS ensures that committed actions are written to disk or, in case of a crash, the system must redo actions of committed transactions which were not yet written to disk?

What is the primary reason for the DBMS to log all actions of a transaction?

In the context of concurrent execution of transactions, what is the main purpose of overlapping I/O and CPU operations?

Which characteristic defines a serializable schedule in a DBMS?

What represents a major challenge for a DBMS during concurrent execution of transactions?

What is the primary role of concurrency control in a DBMS?

In the context of transactions, what does 'Atomicity' ensure?

What is the main reason for maintaining equivalent schedules in a DBMS?

What role does the DBMS log play in ensuring atomicity during transaction processing?

In the context of concurrency control, what does a schedule refer to?

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