This set of RDBMS Multiple Choice Questions & Answers (MCQs) focuses on “Transaction Concept and Model”.
1. Collections of operations that form a single logical unit of work are called __________
a) Views
b) Networks
c) Units
d) Transactions
View Answer
Explanation: Collections of operations that form a single logical unit of work are called transactions. A database system must ensure proper execution of transactions.
2. The “all-or-none” property is commonly referred to as _________
a) Isolation
b) Durability
c) Atomicity
d) None of the mentioned
View Answer
Explanation: The all or none policy is commonly referred to as atomicity. It ensures that a work is either completed or not completed and there are no intermediate stages.
3. Which of the following is a property of transactions?
a) Atomicity
b) Durability
c) Isolation
d) All of the mentioned
View Answer
Explanation: Atomicity, Durability and Isolation are all properties of transactions.
4. Execution of translation in isolation preserves the _________ of a database
a) Atomicity
b) Consistency
c) Durability
d) All of the mentioned
View Answer
Explanation: Execution of translation in isolation preserves the consistency of a database. It ensures that no other transaction is running concurrently.
5. Which of the following is not a property of a transaction?
a) Atomicity
b) Simplicity
c) Isolation
d) Durability
View Answer
Explanation: Simplicity is not a property of a transaction. Atomicity, Isolation, Durability are all parts of ACID properties.
6. Which of the following systems is responsible for ensuring durability?
a) Recovery system
b) Atomic system
c) Concurrency control system
d) Compiler system
View Answer
Explanation: The recovery system is responsible for the maintenance of durability. In addition, it also ensures atomicity.
7. Which of the following systems is responsible for ensuring isolation?
a) Recovery system
b) Atomic system
c) Concurrency control system
d) Compiler system
View Answer
Explanation: The concurrency control system is responsible for ensuring isolation in a database system.
8. State true or false: Information residing in the volatile storage does not usually survive system crashes
a) True
b) False
View Answer
Explanation: Information residing in the volatile storage does not usually survive system crashes but the information in stable storage can survive system crashes efficiently.
9. A transaction that has not been completed successfully is called as _______
a) Compensating transaction
b) Aborted transaction
c) Active transaction
d) Partially committed transaction
View Answer
Explanation: Aborted transaction is a state after the transaction has been rolled back and the database has been restored to the state prior to the transaction.
10. Which of the following is not a transaction state?
a) Active
b) Partially committed
c) Failed
d) Compensated
View Answer
Explanation: Compensated is not a transaction state. But active, partially committed and failed are different states of a transaction.
11. The execution sequences in concurrency control are termed as ________
a) Serials
b) Schedules
c) Organizations
d) Time tables
View Answer
Explanation: The execution sequences in concurrency control are known as schedules.
12. The scheme that controls the interaction between executing transactions is called as _____
a) Concurrency control scheme
b) Multiprogramming scheme
c) Serialization scheme
d) Schedule scheme
View Answer
Explanation: The scheme that controls the interaction between executing transactions is called as concurrency control scheme.
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