DS0-001 Data Systems Management Practice Question
A DBA is tuning a query that performs a large join. The execution plan shows a 'Hash Match' operation. What can the DBA do to potentially change the join algorithm if the Hash Match is causing high memory pressure?
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
✓
Create an index on join columns
Adding an index on the join columns allows the optimizer to consider a 'Merge Join' or 'Nested Loop' join, which may be more memory-efficient than a Hash Match.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create an index on join columns
Why this is correct
Indexing join keys provides the optimizer with alternative, potentially more efficient, join strategies.
- ✗
Set the isolation level to Read Uncommitted
Why it's wrong here
This affects concurrency, not the algorithm of a specific join operation.
- ✗
Force the join order
Why it's wrong here
Forcing join order does not necessarily change the join algorithm used by the engine.
- ✗
Update statistics
Why it's wrong here
Updating statistics helps the optimizer choose the right path but does not inherently change the algorithm if it's already considered optimal.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CompTIA exam blueprint
This DS0-001 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 DS0-001 exam.