Question 1,385 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon Redshift for analytics. The database administrator notices that some queries are slow and the system is running out of memory. Which THREE steps should the administrator take to improve performance?
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
✓
Optimize the table design by choosing appropriate distkeys and sortkeys
Scaling up increases memory per node but may not be sufficient; scaling out (adding nodes) is often more effective. Option B is correct because proper distribution and sort keys minimize data shuffling and improve query performance. Option C is correct because adding more nodes increases the cluster's total memory and compute capacity. Option D is incorrect because VACUUM reclaims disk space, not memory. Option E is correct because configuring WLM limits concurrent queries, reducing memory contention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the node size (scale up) to get more memory per node
Why it's wrong here
Scale up is an option but scale out is also valid; however, the question asks for three steps, and scale up is not listed as a separate choice.
- ✓
Optimize the table design by choosing appropriate distkeys and sortkeys
Why this is correct
Better data distribution reduces memory usage during joins.
- ✓
Add more nodes to the cluster to increase total memory
Why this is correct
More nodes provide more memory for query processing.
- ✗
Run the VACUUM command to reclaim space from deleted rows
Why it's wrong here
Vacuum does not free memory.
- ✓
Configure workload management (WLM) to limit the number of concurrent queries
Why this is correct
Limiting concurrency reduces memory pressure per query.
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Last reviewed: Jun 20, 2026
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services 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 DBS-C01 exam.
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