Practice - Concurrency Control: The Problem of Concurrency Control
Practice Questions
Test your understanding with targeted questions
What is the Lost Update problem?
💡 Hint: Think about what happens with two transactions changing the same data.
Define the Dirty Read problem.
💡 Hint: Consider situations where data can change before a commit.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is a Lost Update?
💡 Hint: Consider a scenario with two transactions modifying the same record.
True or False: A Dirty Read occurs when a transaction reads committed data.
💡 Hint: Remember the difference between committed and uncommitted data.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
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.
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.
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Reference links
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