DEA-C01 Data Operations and Support Practice Question
Which TWO are valid approaches to troubleshoot a slow Amazon Redshift query? (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
✓
Check for table locks using STV_LOCKS.
Options A and C are correct. Checking for table locks using STV_LOCKS (A) helps identify concurrency issues that slow queries, and using EXPLAIN (C) reveals the query execution plan to spot inefficient operations. Option B is incorrect because enabling encryption does not affect query performance. Option D is incorrect because VACUUM reclaims disk space and improves storage but is not a direct troubleshooting step for slow queries. Option E is incorrect because changing DISTSTYLE is a design optimization, not a troubleshooting action.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check for table locks using STV_LOCKS.
Why this is correct
Locks can cause waits.
- ✗
Enable encryption on the cluster.
Why it's wrong here
Encryption does not affect performance.
- ✓
Use the EXPLAIN command to review the query execution plan.
Why this is correct
EXPLAIN reveals how the query is executed.
- ✗
Run VACUUM on the table.
Why it's wrong here
VACUUM reclaims space, may help but not a direct troubleshooting step.
- ✗
Alter the table to change DISTSTYLE to KEY.
Why it's wrong here
This is a design change, not a troubleshooting step.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-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 DEA-C01 exam.