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Questions and Answers
What is a transaction in a database application?
What is a transaction in a database application?
- A collection of operations that performs a single logical function. (correct)
- Any random set of database queries executed together.
- A singular operation that ensures database consistency without exceptions.
- A collection of operations that performs multiple logical functions simultaneously.
What does atomicity in the context of transactions imply?
What does atomicity in the context of transactions imply?
- Transactions can be broken down into multiple independent operations.
- Transactions can execute partially even if they are not completed.
- Atomicity allows for transactions to modify the database without any backups.
- All operations within a transaction must be completed successfully or none at all. (correct)
During the execution of a transaction, what type of inconsistency may be temporarily allowed?
During the execution of a transaction, what type of inconsistency may be temporarily allowed?
- Temporary inconsistency necessary for operations like debits and credits. (correct)
- Only inconsistencies that do not affect the overall database performance.
- No inconsistency should be allowed at any point.
- Permanent inconsistency that resolves over time.
What must be true about a database's consistency when a transaction terminates successfully?
What must be true about a database's consistency when a transaction terminates successfully?
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What potential problem can arise if a failure occurs during a transaction?
What potential problem can arise if a failure occurs during a transaction?
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Study Notes
Understanding Transactions
- A transaction comprises a set of operations executing a single logical function within a database application.
- Each transaction is essential for maintaining atomicity, which guarantees that operations are completed fully or not at all, and consistency, ensuring adherence to database integrity rules.
- Transactions must not breach any consistency constraints within the database; a consistent state before initiation must be preserved when the transaction completes successfully.
- Temporary inconsistency may occur during transaction execution; for example, the order of debiting account A and crediting account B is critical.
- This necessary temporary inconsistency can result in complications if a failure occurs during the transaction process, potentially leading to data integrity issues.
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