Software Development Exam > Software Development Questions > Consider the following SQL code:BEGIN TRANSAC...
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Consider the following SQL code:
BEGIN TRANSACTION;
UPDATE Employees SET Salary = Salary + 500 WHERE Department = 'IT';
COMMIT;
Which of the following ACID properties does this code violate?
BEGIN TRANSACTION;
UPDATE Employees SET Salary = Salary + 500 WHERE Department = 'IT';
COMMIT;
Which of the following ACID properties does this code violate?
- a)Atomicity
- b)Consistency
- c)Isolation
- d)Durability
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider the following SQL code:BEGIN TRANSACTION;UPDATE Employees SET...
The code violates the Atomicity property because it performs multiple salary updates within a single transaction. If one update fails, the others will still be committed, leading to an inconsistent state.
Most Upvoted Answer
Consider the following SQL code:BEGIN TRANSACTION;UPDATE Employees SET...
Explanation:
The given SQL code violates the Atomicity property of ACID.
ACID stands for Atomicity, Consistency, Isolation, and Durability. These are the four properties that ensure the reliability and integrity of a database transaction.
Atomicity means that a transaction is treated as a single, indivisible unit of work. It ensures that either all the changes made by the transaction are committed to the database, or none of them are. If any part of the transaction fails, the entire transaction is rolled back, and the database is left unchanged.
In the given SQL code, the transaction begins with the statement "BEGIN TRANSACTION;". Then, an update statement is executed to increase the salary of employees in the IT department by 500. However, there is an error in the SQL code, where there is a missing "+" sign before the 500. This will cause the update statement to fail, as it tries to set the Salary column to the value of the Salary column itself, resulting in an error.
Since the update statement fails, the transaction cannot be completed successfully. However, the code does not handle this failure and proceeds to commit the transaction with the statement "COMMIT;". This violates the atomicity property because the transaction should have been rolled back when the update statement failed.
In order to fix this code and maintain atomicity, the missing "+" sign should be added before the 500 in the update statement. Additionally, error handling should be implemented to rollback the transaction if any part of it fails.
To summarize, the given SQL code violates the atomicity property as it does not rollback the transaction when the update statement fails.
The given SQL code violates the Atomicity property of ACID.
ACID stands for Atomicity, Consistency, Isolation, and Durability. These are the four properties that ensure the reliability and integrity of a database transaction.
Atomicity means that a transaction is treated as a single, indivisible unit of work. It ensures that either all the changes made by the transaction are committed to the database, or none of them are. If any part of the transaction fails, the entire transaction is rolled back, and the database is left unchanged.
In the given SQL code, the transaction begins with the statement "BEGIN TRANSACTION;". Then, an update statement is executed to increase the salary of employees in the IT department by 500. However, there is an error in the SQL code, where there is a missing "+" sign before the 500. This will cause the update statement to fail, as it tries to set the Salary column to the value of the Salary column itself, resulting in an error.
Since the update statement fails, the transaction cannot be completed successfully. However, the code does not handle this failure and proceeds to commit the transaction with the statement "COMMIT;". This violates the atomicity property because the transaction should have been rolled back when the update statement failed.
In order to fix this code and maintain atomicity, the missing "+" sign should be added before the 500 in the update statement. Additionally, error handling should be implemented to rollback the transaction if any part of it fails.
To summarize, the given SQL code violates the atomicity property as it does not rollback the transaction when the update statement fails.
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Consider the following SQL code:BEGIN TRANSACTION;UPDATE Employees SET Salary = Salary + 500 WHERE Department = IT;COMMIT;Which of the following ACID properties does this code violate?a)Atomicityb)Consistencyc)Isolationd)DurabilityCorrect answer is option 'A'. Can you explain this answer?
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