Isolation levels in SQL define how transactions interact with each other and the visibility of data changes across sessions. This quiz on SQL isolation levels explores transaction isolation, concurrency, and common read phenomena.
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What does the “Isolation” property in ACID ensure?
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Question 2 of 15
2. Question
Which SQL keyword sets the transaction isolation level?
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Question 3 of 15
3. Question
Which of the following is the lowest isolation level?
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Question 4 of 15
4. Question
Which isolation level prevents dirty reads but allows non-repeatable reads?
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Question 5 of 15
5. Question
Which isolation level prevents both dirty and non-repeatable reads, but not phantom reads?
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Question 6 of 15
6. Question
What is a phantom read?
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Question 7 of 15
7. Question
Which isolation level is the most restrictive and prevents all read anomalies?
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Question 8 of 15
8. Question
Which phenomenon is allowed under READ UNCOMMITTED?
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Question 9 of 15
9. Question
What does the READ COMMITTED isolation level guarantee?
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Question 10 of 15
10. Question
Which isolation level locks the rows it reads, preventing other updates until the transaction ends?
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Question 11 of 15
11. Question
Which isolation level may lead to the highest risk of blocking or deadlocks?
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Question 12 of 15
12. Question
Which isolation level is generally the default in most RDBMS systems like SQL Server and PostgreSQL?
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Question 13 of 15
13. Question
Which of the following is TRUE about isolation levels?
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Question 14 of 15
14. Question
What happens if two transactions use SERIALIZABLE isolation and try to modify the same data?
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Question 15 of 15
15. Question
In SQL Server, which isolation level uses row versioning to avoid blocking?
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Summary
Understanding SQL isolation levels is critical for controlling data consistency, preventing race conditions, and optimizing concurrent access. This quiz on SQL isolation levels tests your knowledge of ACID properties, anomalies, and behavior across isolation levels.
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