Quick Answer
The answer is FullTableScans and TableScanRows. FullTableScans directly counts the number of full scan operations initiated against tables, while TableScanRows measures the volume of rows read through those scans, together providing a clear picture of excessive sequential reads that often signal missing or poorly designed indexes. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your ability to distinguish between performance metrics that indicate a specific problem versus general health indicators—a common trap is choosing BufferCacheHitRatio, which reflects cache efficiency rather than scan behavior. Remember the memory tip: “Scans count operations, rows measure impact,” so when monitoring for full table scans, always pair the operation count with the row volume to confirm the severity.
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is running a critical Oracle database on Amazon RDS. The DBA wants to set up monitoring to detect if the database is experiencing a high number of full table scans, which may indicate missing indexes. Which TWO metrics should the DBA monitor? (Choose TWO.)
TableScanRows
Shows the number of rows scanned in full table scans.
FullTableScans
Directly counts full table scans, indicating potential missing indexes.
BufferCacheHitRatio
Why wrong: This metric shows cache hit ratio, not full table scans.
UserCommits
Why wrong: Commit count is unrelated to table scans.
RedoLogSpaceUsage
Why wrong: This metric is about redo log, not table scans.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
TableScanRows
Options B and D are correct. FullTableScans (B) directly counts full scan operations. TableScanRows (D) indicates the number of rows read via full scans. Option A is wrong because BufferCacheHitRatio indicates cache efficiency, not full scans. Option C is wrong because UserCommits shows transaction commits. Option E is wrong because RedoLogSpaceUsage relates to write-ahead logging.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
TableScanRows
Why this is correct
Shows the number of rows scanned in full table scans.
Related concept
Standard ACLs match source addresses.
FullTableScans
Why this is correct
Directly counts full table scans, indicating potential missing indexes.
Related concept
Standard ACLs match source addresses.
BufferCacheHitRatio
Why it's wrong here
This metric shows cache hit ratio, not full table scans.
UserCommits
Why it's wrong here
Commit count is unrelated to table scans.
RedoLogSpaceUsage
Why it's wrong here
This metric is about redo log, not table scans.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
This metric shows cache hit ratio, not full table scans.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Standard ACLs match source addresses..
The correct answer is: TableScanRows — Options B and D are correct. FullTableScans (B) directly counts full scan operations. TableScanRows (D) indicates the number of rows read via full scans. Option A is wrong because BufferCacheHitRatio indicates cache efficiency, not full scans. Option C is wrong because UserCommits shows transaction commits. Option E is wrong because RedoLogSpaceUsage relates to write-ahead logging.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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.
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