DataSys+ ACID Properties of Transactions Quiz

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3. True or False: The Read Uncommitted isolation level provides the best performance but allows dirty reads.

True

False

4. Which ACID property is violated if a transaction leaves the database in an inconsistent state?

Atomicity

Consistency

Isolation

Durability

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6. True or False: Consistency and Isolation are the same ACID property.

True

False

7. Which scenario best demonstrates the Durability property?

A committed transaction survives a system crash

A transaction rolls back due to a constraint violation

Two transactions see different versions of the same data

A transaction completes all operations or none

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9. True or False: The Isolation property eliminates the need for locking mechanisms in databases.

True

False

10. Which ACID property is most directly related to transaction logging and recovery mechanisms?

Atomicity

Consistency

Isolation

Durability

11. Which ACID property ensures that a transaction either completes entirely or not at all?

Atomicity

Consistency

Isolation

Durability

12. True or False: Atomicity requires that all changes be written to disk before a transaction commits.

True

False

13. Which isolation level provides the highest level of transaction isolation?

Read Committed

Repeatable Read

Serializable

Read Uncommitted

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15. Which isolation level allows dirty reads but prevents lost updates?

Read Uncommitted

Read Committed

Repeatable Read

Serializable

16. If a transaction violates a database constraint, which property rolls back the transaction?

Atomicity

Consistency

Isolation

Durability

17. A transaction that updates an account balance fails halfway through. Which property prevents partial updates?

Consistency

Isolation

Atomicity

Durability

18. The Durability property ensures that committed data survives which type of failure?

Network outages only

System crashes and power failures

User errors only

Concurrent transaction conflicts

19. Which ACID property prevents dirty reads and phantom reads?

Atomicity

Consistency

Isolation

Durability

20. What does the Consistency property guarantee about database state?

All data is written to disk immediately

The database moves from one valid state to another

Transactions cannot see uncommitted changes

Multiple transactions can run simultaneously

DataSys+ ACID Properties of Transactions Quiz

1. A phantom read occurs when a transaction reads a set of rows, then another transaction _____ or deletes rows in that set.

2.

What first name or nickname would you like us to use?

2. A nonrepeatable read occurs when a transaction reads the same row twice and gets _____ results.

3. True or False: The Read Uncommitted isolation level provides the best performance but allows dirty reads.

4. Which ACID property is violated if a transaction leaves the database in an inconsistent state?

5. In the context of ACID, the Atomicity property is enforced through _____ and rollback mechanisms.

6. True or False: Consistency and Isolation are the same ACID property.

7. Which scenario best demonstrates the Durability property?

8. A lost update occurs when two transactions update the same row without proper _____.

9. True or False: The Isolation property eliminates the need for locking mechanisms in databases.

10. Which ACID property is most directly related to transaction logging and recovery mechanisms?

11. Which ACID property ensures that a transaction either completes entirely or not at all?

12. True or False: Atomicity requires that all changes be written to disk before a transaction commits.

13. Which isolation level provides the highest level of transaction isolation?

14. A dirty read occurs when a transaction reads _____ data from another transaction.

15. Which isolation level allows dirty reads but prevents lost updates?

16. If a transaction violates a database constraint, which property rolls back the transaction?

17. A transaction that updates an account balance fails halfway through. Which property prevents partial updates?

18. The Durability property ensures that committed data survives which type of failure?

19. Which ACID property prevents dirty reads and phantom reads?

20. What does the Consistency property guarantee about database state?