Q99.Marks: +2.0UGC NET Paper 2: Computer Science 7th Dec 2023 Shift 2
Which one of the following statements are CORRECT?
(A) Granularity is the size of data item in a database.
(B) Two operations in a schedule are said to be conflict if they belong to same transaction.
(C) Two schedulers are said to be conflict equivalent if the order of any two conflicting operations is the same in both schedules.
(D) Write operations which are performed without performing the write operation are known as Blind Writes.
Choose the correct answer from the options given below:
1.(A) and (B) Only
2.(A), (B) and (C) Only✓ Correct
3.(A), (B) and (D) Only
4.(B) and (C) Only
Solution
The correct answer is (A), (B) and (C) Only
EXPLANATION:
(A) Granularity is the size of a data item in a database.
Granularity refers to the level of detail or size of the data that is stored in a database. It can vary from fine granularity (smaller, more detailed data items) to coarse granularity (larger, less detailed data items). The statement is correct.
(B) Two operations in a schedule are said to be conflict if they belong to the same transaction.
In the context of database transactions, operations are considered conflicting if they involve the same data item and at least one of them is a write operation. The statement is correct.
(C) Two schedulers are said to be conflict equivalent if the order of any two conflicting operations is the same in both schedules.
Conflict equivalence in schedulers means that if two schedules result in the same final state, they are conflict equivalent if the order of conflicting operations (operations that access the same data item and at least one is a write operation) is the same in both schedules. The statement is correct.
(D) Write operations which are performed without performing the read operation are known as Blind Writes.
This statement is incorrect. Blind Writes typically refer to write operations performed without checking or reading the existing content. If a write operation is performed without a prior read, it doesn't necessarily make it a Blind Write.
Therefore, the correct statements are (A), (B), and (C).
Mistake PointsTwo operations in a schedule are said to be conflict if they belong to the same transaction.
In the context of database transactions, operations are considered conflicting if they involve the same data item and at least one of them is a write operation. The statement is incorrect. But it is official question and official answer consider it is correct.
