GATE CSE 2025 Set 1 | Transactions and Concurrency Question 3 | Database Management System

GATE CSE 2025 Set 1

MCQ (Single Correct Answer)

-0.33

A schedule of three database transactions $T_1, T_2$, and $T_3$ is shown. $R_i(A)$ and $W_i(A)$ denote read and write of data item $A$ by transaction $T_i, i=1,2,3$. The transaction $T_1$ aborts at the end. Which other transaction(s) will be required to be rolled back?

$$R_1(X) W_1(Y) R_2(X) R_2(Y) R_3(Y) \operatorname{ABORT}\left(T_1\right)$$

Only $T_2$

Only $T_3$

Both $T_2$ and $T_3$

Neither $T_2$ nor $T_3$

GATE CSE 2024 Set 2

MCQ (Single Correct Answer)

-0.33

Once the DBMS informs the user that a transaction has been successfully completed, its effect should persist even if the system crashes before all its changes are reflected on disk. This property is called

durability

atomicity

consistency

isolation

GATE CSE 2024 Set 2

MCQ (More than One Correct Answer)

-0

Which of the following statements about the Two Phase Locking (2PL) protocol is/are TRUE?

2PL permits only serializable schedules

With 2PL, a transaction always locks the data item being read or written just before every operation and always releases the lock just after the operation

With 2PL, once a lock is released on any data item inside a transaction, no more locks on any data item can be obtained inside that transaction

A deadlock is possible with 2PL

GATE CSE 2021 Set 1

MCQ (More than One Correct Answer)

-0

Suppose a database system crashes again while recovering from a previous crash. Assume checkpointing is not done by the database either during the transactions or during recovery.

Which of the following statements is/are correct?

The same undo and redo list will be used while recovering again.

The database will become inconsistent.

All the transactions that are already undone and redone will not be recovered again.

The system cannot recover any further.

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