Question 1,378 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon Redshift for data warehousing. The VACUUM operation is taking longer than expected, and the database administrator wants to identify the tables that require the most vacuuming effort. Which system table should be queried to find the percentage of deleted rows per table?
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
✓
SVV_TABLE_INFO
(SVV_TABLE_INFO) is correct because this system table contains tombstone and unsorted statistics, including the percentage of deleted rows per table, which helps identify tables requiring vacuuming. Option A (STL_QUERY) is incorrect because it stores query execution logs, not table statistics. Option B (STV_TBL_PERM) is incorrect as it provides information about permanent table block allocations but not deleted row ratios. Option C (PG_TABLE_DEF) is incorrect because it holds table schema definitions only, not operational metrics.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
STL_QUERY
Why it's wrong here
STL_QUERY logs queries, not table statistics.
- ✗
STV_TBL_PERM
Why it's wrong here
STV_TBL_PERM shows table metadata but not vacuum-related metrics.
- ✗
PG_TABLE_DEF
Why it's wrong here
PG_TABLE_DEF describes table columns, not vacuum metrics.
- ✓
SVV_TABLE_INFO
Why this is correct
SVV_TABLE_INFO includes columns for unsorted rows and tombstone blocks.
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Last reviewed: Jun 20, 2026
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