DBS-C01 Management and Operations Practice Question
A company is using Amazon Redshift for data warehousing. The database administrator needs to optimize query performance. Which TWO actions should the administrator take? (Choose 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
✓
Analyze the tables to update statistics for the query optimizer.
Options B and E are correct. Analyzing tables updates statistics for the query optimizer, enabling efficient query plan generation. Running VACUUM reclaims space and re-sorts data, improving data distribution and query performance. Option A is incorrect because increasing nodes is a scaling action, not an optimization action, and adds cost. Option C is incorrect because enabling encryption does not directly impact query performance. Option D is incorrect because disabling compression increases storage and I/O, degrading performance.
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 number of nodes in the cluster.
Why it's wrong here
Scaling up improves performance but is not an optimization action; it increases cost.
- ✓
Analyze the tables to update statistics for the query optimizer.
Why this is correct
Updated statistics help the optimizer choose efficient query plans.
- ✗
Enable encryption for the cluster.
Why it's wrong here
Encryption does not improve query performance.
- ✗
Disable compression on the tables to reduce CPU overhead.
Why it's wrong here
Disabling compression can degrade performance and increase storage costs.
- ✓
Run the VACUUM command to reclaim space and re-sort data.
Why this is correct
VACUUM improves performance by reorganizing data and reclaiming space.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.