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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the Lost Update problem?
💡 Hint: Think about what happens with two transactions changing the same data.
Question 2
Easy
Define the Dirty Read problem.
💡 Hint: Consider situations where data can change before a commit.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is a Lost Update?
- One transaction reading uncommitted data
- One transaction overwriting another's updates
- A transaction failing to commit
💡 Hint: Consider a scenario with two transactions modifying the same record.
Question 2
True or False: A Dirty Read occurs when a transaction reads committed data.
- True
- False
💡 Hint: Remember the difference between committed and uncommitted data.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a detailed description of a scenario in a flight reservation system where all four concurrency issues (Lost Update, Dirty Read, Unrepeatable Read, Phantom) manifest. Outline what transactions are involved and how they lead to inconsistencies.
💡 Hint: Consider multiple transactions with overlapping read/write operations on shared resources.
Question 2
Calculate impact in a retail application where one transaction updates inventory counts, while another transaction checks the counts before and after updates.
💡 Hint: Think about the sequence of transactions and how one can affect the results seen by another.
Challenge and get performance evaluation