Recall & Review
beginner
What does the 'A' in ACID stand for in database transactions?
The 'A' stands for Atomicity. It means a transaction is all or nothing: either all steps complete successfully, or none do.
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beginner
Explain the 'C' in ACID properties.
The 'C' stands for Consistency. It means the database moves from one valid state to another, following all rules and constraints.
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intermediate
What does 'I' represent in ACID and why is it important?
'I' stands for Isolation. It ensures that transactions run independently without interfering with each other, like people working in separate rooms.
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beginner
Describe the 'D' in ACID properties.
'D' means Durability. Once a transaction is committed, its changes are permanent, even if the system crashes immediately after.
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intermediate
Why is the ACID model important for databases?
ACID ensures reliable transactions, preventing errors like partial updates or data corruption, so users trust the data is correct and safe.
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Which ACID property ensures a transaction is completed fully or not at all?
✗ Incorrect
Atomicity means the transaction is all or nothing.
Which property guarantees that once a transaction commits, changes are permanent?
✗ Incorrect
Durability ensures changes survive system failures.
What does Isolation prevent in concurrent transactions?
✗ Incorrect
Isolation keeps transactions from affecting each other.
Consistency in ACID means:
✗ Incorrect
Consistency means the database stays valid after transactions.
If a transaction fails halfway, which ACID property ensures no partial changes remain?
✗ Incorrect
Atomicity rolls back partial changes on failure.
Describe each ACID property using a simple real-life example.
Think about how a bank transaction works.
You got /4 concepts.
Why is it important for a database to follow ACID properties?
Consider what happens if data gets corrupted or lost.
You got /4 concepts.