The correct answer is to query V$SGASTAT and V$PGASTAT to understand memory allocation, as this directly reveals how the System Global Area and Program Global Area are consuming the instance’s memory. When freeable memory on RDS Oracle drops below 256 MB alongside high read/write I/O, the root cause is often internal memory pressure from SGA or PGA components, not a lack of host memory—so checking these dynamic views lets you pinpoint which cache or session memory is bloated. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your ability to distinguish between diagnostic steps and remediation: common traps include confusing storage auto-scaling or instance resizing with actual memory analysis, but the exam expects you to first verify memory allocation before scaling. Remember the mnemonic “SGA-PGA First” to avoid jumping to resizing—always diagnose before you prescribe.
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 monitoring an Amazon RDS for Oracle instance. CloudWatch alarms show that FreeableMemory is consistently below 256 MB. The database has high read and write I/O. Which THREE steps should the database specialist take to diagnose the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the MemoryPressure and LogFileSyncDuration metrics in CloudWatch.
Options A, C, and D are correct. Checking memory pressure (A), looking at swap usage (C), and reviewing memory advisor (D) are all appropriate. Option B is wrong because storage auto scaling does not address memory. Option E is wrong because RDS uses a fixed SGA/PGA, and increasing instance size might be a solution but not a diagnostic step.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Check the MemoryPressure and LogFileSyncDuration metrics in CloudWatch.
Why this is correct
These metrics indicate memory pressure and potential performance impact.
Related concept
Standard ACLs match source addresses.
✓
Review the Oracle memory advisor (V$MEMORY_TARGET_ADVICE).
Why this is correct
Memory advisor provides recommendations for sizing.
Related concept
Standard ACLs match source addresses.
✗
Enable storage auto scaling to increase allocated storage.
Why it's wrong here
Storage auto scaling does not affect memory.
✗
Increase the DB instance class to allocate more memory.
Why it's wrong here
This is a remediation, not a diagnostic step.
✓
Query V$SGASTAT and V$PGASTAT to understand memory allocation.
Why this is correct
These views show SGA/PGA usage.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
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
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Check the MemoryPressure and LogFileSyncDuration metrics in CloudWatch. — Options A, C, and D are correct. Checking memory pressure (A), looking at swap usage (C), and reviewing memory advisor (D) are all appropriate. Option B is wrong because storage auto scaling does not address memory. Option E is wrong because RDS uses a fixed SGA/PGA, and increasing instance size might be a solution but not a diagnostic step.
What should I do if I get this DBS-C01 question wrong?
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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