Ch 42: Transaction Concepts & ACID Properties

Comprehensive study of Atomicity (all or nothing), Consistency (preserving database invariants), Isolation (unaware of concurrent execution), and Durability (permanent committed updates).

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CS403 - Database Management Systems Examination Practice

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❓ MCQ📘 CS403📑 Lec 42🏷️ 42.2. ACID Properties of TransactionsMedium🔁⭐💡🌟📄🎓VU🏛️VU

Which of the following is NOT a characteristic or a requirement of a standard Database Transaction under ACID transaction management rules?

💻 text Snippet

-- Every database transaction must follow ACID rules:
-- Atomicity, Consistency, Isolation, Durability

A.Users should be able to regard the execution of each transaction as atomic (all-or-nothing).
B.Each transaction must preserve the consistency of the database, transforming it from one valid state to another.
C.The execution of a transaction is isolated and completely independent of other concurrent transactions.
D.The correctness and execution state of a transaction is dependent on other concurrent transactions.

❓ MCQ📘 CS403📑 Lec 42🏷️ 42.2. Transaction Properties (ACID)Medium🔁⭐💡📄🎓VU🏛️VU

Transaction management in relational database systems relies on four fundamental properties, collectively known as the ACID properties. Which of the following lists these properties correctly?

💻 text Snippet

ACID Properties:
- A: Atomicity (All or Nothing)
- C: Consistency (Valid State)
- I: Isolation (Independent Execution)
- D: Durability (Persistent Changes)

A.Atomicity, Consistency, Isolation, and Durability
B.Association, Cardinality, Identity, and Decomposition
C.Access, Concurrency, Indexing, and Denormalization
D.Aggregation, Cascading, Integrity, and Dependency

❓ MCQ📘 CS403📑 Lec 42🏷️ 42.2. ACID Properties of TransactionsEasy🔁⭐💡📄🎓VU🏛️VU

Match the database transaction properties (ACID) in Column A with their correct operational rules in Column B: Column A (Properties): 1. Atomicity 2. Consistency 3. Isolation 4. Durability Column B (Rules): A. The database must transition from one valid state of integrity to another. B. Concurrent execution of transactions must not interfere with each other. C. All operations of a transaction must complete successfully, or the entire transaction is rolled back. D. Committed changes must survive subsequent system crashes or power failures.

💻 sql Snippet

-- Conceptual SQL showing atomicity with a commit/rollback
BEGIN TRANSACTION;
   UPDATE Accounts SET Balance = Balance - 200 WHERE AccountID = 101;
   UPDATE Accounts SET Balance = Balance + 200 WHERE AccountID = 102;
-- If any error occurs, rollback is executed:
ROLLBACK;
-- If both succeed:
COMMIT;

A.1-C, 2-A, 3-B, 4-D
B.1-A, 2-C, 3-D, 4-B
C.1-B, 2-D, 3-C, 4-A
D.1-D, 2-B, 3-A, 4-C

❓ MCQ📘 CS403📑 Lec 42🏷️ 42.2. ACID Properties of TransactionsEasy🔁⭐💡🌟📄🎓VU🏛️VU

Match the database transaction properties (ACID) with their correct real-world descriptions and operational rules: 1. Atomicity - A. All transaction operations must complete successfully, or the entire transaction is rolled back. 2. Consistency - B. A transaction must transition the database from one valid state of integrity to another. 3. Isolation - C. Concurrent transaction executions must not interfere with each other. 4. Durability - D. Completed transactions must survive server crashes and power failures.

💻 sql Snippet

-- Conceptual Transaction Block showing Atomicity:
BEGIN TRANSACTION;
   UPDATE Accounts SET Balance = Balance - 500 WHERE AccID = 101;
   UPDATE Accounts SET Balance = Balance + 500 WHERE AccID = 102;
COMMIT; -- If either fails, ROLLBACK occurs.

A.1-A, 2-B, 3-C, 4-D
B.1-B, 2-A, 3-D, 4-C
C.1-C, 2-D, 3-A, 4-B
D.1-D, 2-C, 3-B, 4-A

🧠 Long Problem📘 CS403📑 Lec 42🏷️ 42.2. ACID Properties of TransactionsMedium🔁⭐💡🌟📄🎓VU🏛️VU

Describe the 'Atomicity' property (the 'A' in ACID) of database transactions and explain its significance in transactional database integrity.

💻 sql Snippet

-- Atomicity in action (Rollback on failure):
BEGIN TRANSACTION;
   UPDATE Accounts SET Balance = Balance - 500 WHERE AccID = 101;
   -- If crash happens here, DBMS rolls back previous line on restart.
   UPDATE Accounts SET Balance = Balance + 500 WHERE AccID = 102;
COMMIT;

❓ MCQ📘 CS403📑 Lec 42🏷️ 42.2. ACID Properties of TransactionsEasy🔁⭐💡📄🎓VU🏛️VU

The ACID properties serve as the foundational standard for database transactions. Which of the following is NOT classified as a standard transaction property under relational transaction management guidelines?

💻 text Snippet

-- Transaction ACID properties verify:
-- A: Atomicity
-- C: Consistency
-- I: Isolation
-- D: Durability

A.Atomicity
B.Consistency
C.Redundancy
D.Durability

Ch 42: Transaction Concepts & ACID Properties

CS403 - Database Management Systems Examination Practice

Mid Term Examination

Final Term Examination

CS403 - Database Management Systems Examination Practice

Mid Term Examination

Final Term Examination

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