- A
Enhanced Networking is disabled
Why wrong: Affects network, not storage I/O.
- B
Incorrect Oracle DB parameter settings
Why wrong: Could be a cause but not AWS-specific.
- C
EBS snapshot schedule is too frequent
Why wrong: Snapshots are asynchronous and don't cause this error.
- D
EBS volume queue depth is too low causing I/O throttling
Low queue depth leads to I/O bottlenecks and rollback segments issues.
Question 107 of 1,733
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. 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 recently migrated SAP ERP to AWS. The SAP application logs indicate repeated 'ORA-1555 snapshot too old' errors in the Oracle database. Which AWS-specific parameter could be causing this?
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
✓
EBS volume queue depth is too low causing I/O throttling
The correct answer is D. 'ORA-1555 snapshot too old' errors occur when Oracle needs to read consistent undo data that has been overwritten. In AWS, EBS volume queue depth that is too low can cause I/O throttling, leading to longer transaction times and increased likelihood of undo segment overwrites before a query completes. Option A is wrong because Enhanced Networking affects network throughput, not storage I/O. Option B is incorrect because while Oracle DB parameters like UNDO_RETENTION can influence this error, the question asks for an AWS-specific parameter. Option C is wrong because EBS snapshots are point-in-time copies and do not directly cause live transaction rollbacks.
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.
- ✗
Enhanced Networking is disabled
Why it's wrong here
Affects network, not storage I/O.
- ✗
Incorrect Oracle DB parameter settings
Why it's wrong here
Could be a cause but not AWS-specific.
- ✗
EBS snapshot schedule is too frequent
Why it's wrong here
Snapshots are asynchronous and don't cause this error.
- ✓
EBS volume queue depth is too low causing I/O throttling
Why this is correct
Low queue depth leads to I/O bottlenecks and rollback segments issues.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 PAS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Operations and Maintenance — This question tests Operations and Maintenance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: EBS volume queue depth is too low causing I/O throttling — The correct answer is D. 'ORA-1555 snapshot too old' errors occur when Oracle needs to read consistent undo data that has been overwritten. In AWS, EBS volume queue depth that is too low can cause I/O throttling, leading to longer transaction times and increased likelihood of undo segment overwrites before a query completes. Option A is wrong because Enhanced Networking affects network throughput, not storage I/O. Option B is incorrect because while Oracle DB parameters like UNDO_RETENTION can influence this error, the question asks for an AWS-specific parameter. Option C is wrong because EBS snapshots are point-in-time copies and do not directly cause live transaction rollbacks.
What should I do if I get this PAS-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 PAS-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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Last reviewed: Jun 20, 2026
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