Explore topic-wise MCQs in Database.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Database knowledge and support exam preparation. Choose a topic below to get started.

1.

In_which_scenario_would_you_use_the_ROLLUP_operator_for_expression_or_columns_within_a_GROUP_BY_clause?$

A. To find the groups forming the subtotal in a row
B. To create group-wise grand totals for the groups specified within a GROUP BY clause
C. To create a grouping for expressions or columns specified within a GROUP BY clause in one direction, from right to left for calculating the subtotals
D. To create a grouping for expressions or columns specified within a GROUP BY clause in all possible directions, which is cross-tabular report for calculating the subtotals
Answer» D. To create a grouping for expressions or columns specified within a GROUP BY clause in all possible directions, which is cross-tabular report for calculating the subtotals
Discussion
2.

__________ are used to ensure that transactions access each data item in order of the transactions’ ____ if their accesses conflict.$

A. Zone
B. Relay
C. Line
D. Timestamps
Answer» E.
Discussion
3.

A concurrency-control policy such as this one leads to ______ performance since it forces transactions to wait for preceding transactions to finish before they can start.

A. Good
B. Average
C. Poor
D. Unstable
Answer» D. Unstable
Discussion
4.

In concurrency control policy the lock is obtained on

A. Entire database
B. A particular transaction alone
C. All the new elements
D. All of the mentioned
Answer» B. A particular transaction alone
Discussion