DA0-002 Data Concepts and Environments Practice Question
A database designer wants to improve query performance on a large table that is frequently filtered by multiple columns. Which TWO types of indexes could be beneficial? (Select TWO).
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
✓
Composite index
Composite indexes cover multiple columns, and B-tree indexes are general-purpose and support range queries, both useful for filtering on multiple columns.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Bitmap index
Why it's wrong here
Bitmap indexes are good for low-cardinality columns, not typically for multiple columns.
- ✓
Composite index
Why this is correct
Composite indexes on multiple columns can speed up queries filtering by those columns.
- ✗
Hash index
Why it's wrong here
Hash indexes are good for equality but not range queries or multiple columns.
- ✗
Full-text index
Why it's wrong here
Full-text indexes are for text search, not general filtering.
- ✓
B-tree index
Why this is correct
B-tree indexes are efficient for range and equality queries.
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