Question 43 of 1,711
DEA-C01 Data Store Management Practice Question
A data engineer notices that an Amazon Redshift cluster is experiencing slow query performance. The engineer suspects that tables are not properly sorted. Which diagnostic query should the engineer run to identify unsorted rows?
⚠ Common exam trap
Many candidates confuse `SVV_TABLE_INFO` with `STV_TBL_PERM` (which shows block counts) or `STL_LOAD_ERRORS` (which is for load debugging), missing that only `SVV_TABLE_INFO` exposes the `unsorted` column specifically designed for sort health analysis.
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
✓
SELECT * FROM SVV_TABLE_INFO ORDER BY unsorted DESC;
The `SVV_TABLE_INFO` system view in Amazon Redshift provides metadata about each table, including the `unsorted` column which shows the percentage of unsorted rows. By ordering by `unsorted DESC`, the engineer can quickly identify tables with the highest proportion of unsorted data, which directly impacts query performance due to inefficient zone maps and scan pruning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SELECT * FROM SVV_TABLE_INFO ORDER BY unsorted DESC;
Why this is correct
SVV_TABLE_INFO shows unsorted rows for each table.
- ✗
SELECT * FROM PG_CATALOG;
Why it's wrong here
PG_CATALOG is a schema, not a view for unsorted rows.
- ✗
SELECT * FROM STV_TBL_PERM;
Why it's wrong here
STV_TBL_PERM is not a valid system view.
- ✗
SELECT * FROM STL_LOAD_ERRORS;
Why it's wrong here
This view shows errors during data loads, not unsorted rows.
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Last reviewed: Jun 24, 2026
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.
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