33 Questions
Which of the following best describes the concept of 'Atomicity' in the context of transactions?
Either all actions of the transaction are executed or none at all
What does the 'Isolation' property ensure in the context of transactions?
Transactions are protected from effects of concurrently running transactions
What is the primary role of the DBMS in achieving concurrency for transactions?
Interleaving actions of various transactions to achieve the same effect as serial execution
In the context of transactions, what does 'Durability' ensure?
Effects of committed transactions must persist and overcome any system failure
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
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
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.
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.
What is the purpose of concurrent execution of user programs in a DBMS?
To increase system throughput by overlapping I/O and CPU operations.
What is the characteristic of a serial schedule in DBMS?
It does not interleave the actions of different transactions.
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.
Why is concurrent execution of transactions important for good DBMS performance?
It increases system throughput by overlapping I/O and CPU operations.
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.
What is the primary goal of scheduling transactions in a DBMS?
To create an actual or potential execution sequence while maintaining consistency.
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.
What represents a major challenge for a DBMS during concurrent execution of transactions?
Coping with effects of interleaving transactions (Concurrency control).
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.
Which property of a transaction ensures that the effects of committed transactions must persist and overcome any system failure?
Durability
In the context of transactions, which property protects a transaction from the effects of concurrently running transactions?
Isolation
What is the primary concern of the DBMS in achieving concurrency for transactions?
Managing scheduling
Which characteristic of a transaction ensures that either all actions of the transaction are executed or none at all?
Atomicity
What is the significance of equivalent schedules in a DBMS?
They produce the same net effect as serial execution of transactions.
In the context of scheduling transactions in a DBMS, what represents a major challenge during concurrent execution?
Preventing transaction interference
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
What is the primary reason for the DBMS to log all actions of a transaction?
To ensure atomicity of transactions
In the context of concurrent execution of transactions, what is the main purpose of overlapping I/O and CPU operations?
Improving system throughput
Which characteristic defines a serializable schedule in a DBMS?
Equivalent to some serial execution of the transactions on any consistent database instance
What represents a major challenge for a DBMS during concurrent execution of transactions?
Handling interleaving transactions
What is the primary role of concurrency control in a DBMS?
Ensuring data consistency
In the context of transactions, what does 'Atomicity' ensure?
All or nothing transaction processing
What is the main reason for maintaining equivalent schedules in a DBMS?
Ensuring database consistency
What role does the DBMS log play in ensuring atomicity during transaction processing?
Undoing actions of aborted transactions
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
Test your knowledge on the overview of transaction management in the context of information systems. This quiz covers topics such as the DBMS’s abstract view of a user program, sequence of reads and writes, ACID properties, and more.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
