- A
B-tree index
B-tree indexes support both exact-match and range queries.
- B
Hash index
Why wrong: Hash indexes support only exact-match lookups, not range queries.
- C
Clustered index
Why wrong: Clustered index defines the physical order, but B-tree is the structure type; however, the question asks for index type, and B-tree is the structure often used.
- D
Bitmap index
Why wrong: Bitmap indexes are used for low-cardinality columns, not general-purpose.
Question 992 of 1,000
DA0-001 Data Concepts and Environments Practice Question
This DA0-001 practice question tests your understanding of data concepts and environments. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which database index type is most commonly used for exact-match lookups and range queries in a B-tree structure?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
B-tree index
A B-tree index is the correct answer because it maintains sorted data in a balanced tree structure, enabling both exact-match lookups (via equality searches) and efficient range queries (via ordered traversal of leaf nodes). This dual capability makes it the standard index type in relational databases like MySQL, PostgreSQL, and Oracle for general-purpose querying.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
B-tree index
Why this is correct
B-tree indexes support both exact-match and range queries.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Hash index
Why it's wrong here
Hash indexes support only exact-match lookups, not range queries.
- ✗
Clustered index
Why it's wrong here
Clustered index defines the physical order, but B-tree is the structure type; however, the question asks for index type, and B-tree is the structure often used.
- ✗
Bitmap index
Why it's wrong here
Bitmap indexes are used for low-cardinality columns, not general-purpose.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'clustered index' as a separate index type, but it is actually a physical implementation of a B-tree where the leaf nodes contain the full row data, not a different algorithmic structure.
Detailed technical explanation
How to think about this question
Under the hood, a B-tree index stores key-value pairs in internal nodes for navigation and leaf nodes for data pointers, with leaf nodes linked in a doubly linked list to support ordered traversal. This design ensures O(log n) complexity for both point lookups and range scans, making it the default index type in InnoDB (MySQL) and many other engines. A real-world scenario is a 'WHERE salary BETWEEN 50000 AND 70000' query on an employee table, where the B-tree index quickly locates the first matching leaf node and then scans forward.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Visual reference
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DA0-001 question test?
Data Concepts and Environments — This question tests Data Concepts and Environments — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: B-tree index — A B-tree index is the correct answer because it maintains sorted data in a balanced tree structure, enabling both exact-match lookups (via equality searches) and efficient range queries (via ordered traversal of leaf nodes). This dual capability makes it the standard index type in relational databases like MySQL, PostgreSQL, and Oracle for general-purpose querying.
What should I do if I get this DA0-001 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This DA0-001 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-001 exam.
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