Database Management Systems (DBMS)
Identify the correct definition of Database index.
Difficulty: Hard
About this MCQ
This Hard Database Management Systems (DBMS) question asks: Identify the correct definition of Database index. The correct choice is A. A database structure that improves the speed of data retrieval operations on a table.. Read the options below, commit to one, then use the explanation to see why that choice holds and why the others do not.
Database Management Systems (DBMS) items like this one are written for Pakistan exams such as CSS, FPSC, PPSC, and NTS. The difficulty label is a hint about how much of the topic the stem assumes, not a score. Tags and exam names, when they are present, tell you where else the same idea is tested. Previous and next links stay in Database Management Systems (DBMS) so you can continue the subject. Related questions point at nearby stems if you want another angle on the same idea.
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- A. A database structure that improves the speed of data retrieval operations on a table. ✓
- B. A stored procedure that automatically executes in response to certain events on a table.
Why not B: “A stored procedure that automatically executes in response to certain events on a table.” does not fit this question. The answer is A database structure that improves the speed of data retrieval operations on a table..
- C. The process of intentionally introducing redundancy into a database to improve read performance.
Why not C: “The process of intentionally introducing redundancy into a database to improve read performance.” does not fit this question. The answer is A database structure that improves the speed of data retrieval operations on a table..
- D. An SQL operation that combines rows from two or more tables based on a related column.
Why not D: “An SQL operation that combines rows from two or more tables based on a related column.” does not fit this question. The answer is A database structure that improves the speed of data retrieval operations on a table..
Correct answer
A. A database structure that improves the speed of data retrieval operations on a table.
Explanation
A database structure that improves the speed of data retrieval operations on a table option A is the accepted answer to Identify the correct definition of Database index Option B A stored procedure that automatically executes in response to certain events on a table does not fit this question Option C The process of intentionally introducing redundancy into a database to improve read performance does not fit this question Option D An SQL operation that combines rows from two or more tables based on a related column does not fit this question For this Database Management Systems DBMS question the accepted answer is A database structure that improves the speed.
Source: Database Management Systems (DBMS) Official Reference Guide
Tags: computer science, dbms, SQL, databases
Submitted by: MCQsHub Editorial
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