DBS-C01 Management and Operations Practice Question
Which TWO of the following are valid actions to take when an Amazon Redshift query is taking longer than expected due to disk-based operations?
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
✓
Redistribute data across nodes using a distribution style that minimizes data movement.
(redistributing data with appropriate distribution style) helps minimize data movement across nodes, reducing disk-based operations like spills. Option E (increasing nodes) adds more memory and CPU, enabling more in-memory processing and reducing disk spills. Option A is incorrect because column compression reduces storage but does not prevent disk-based operations. Option B is incorrect because WLM queues manage concurrency, not query speed. Option D is incorrect because sort keys affect order-based optimizations but not disk spills.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use column compression to reduce the amount of data scanned.
Why it's wrong here
Incorrect: Column compression reduces storage size but does not directly prevent disk-based operations like spills.
- ✗
Increase the number of workload management (WLM) query queues.
Why it's wrong here
Incorrect: Workload management queues manage concurrency, not query execution speed for disk-based operations.
- ✓
Redistribute data across nodes using a distribution style that minimizes data movement.
Why this is correct
Correct: Redistributing data with a distribution style that minimizes data movement reduces the need for disk-based operations.
- ✗
Change the sort keys to match the query's ORDER BY clause.
Why it's wrong here
Incorrect: Sort keys affect order-based optimizations but do not address disk spills.
- ✓
Increase the number of nodes in the cluster to provide more memory and CPU.
Why this is correct
Correct: Increasing the number of nodes provides more memory and CPU, enabling more in-memory processing and reducing disk spills.
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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.