Quick Answer
The correct answer is that EBS volume queue depth is too low, causing I/O throttling. When the queue depth is insufficient, the Oracle database cannot process write requests fast enough, leading to delayed transaction commits and ultimately triggering the ORA-1555 snapshot too old error as rollback segments are overwritten before long-running queries complete. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of how storage I/O performance directly impacts Oracle database behavior in SAP environments—a common trap is confusing snapshot creation with live database I/O, but the real culprit is queue depth limiting throughput. Remember that EBS queue depth acts like a checkout line: if it’s too short, transactions pile up and old data gets overwritten. Memory tip: “Low queue depth, old snapshot depth.”
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?
Enhanced Networking is disabled
Why wrong: Affects network, not storage I/O.
Incorrect Oracle DB parameter settings
Why wrong: Could be a cause but not AWS-specific.
EBS snapshot schedule is too frequent
Why wrong: Snapshots are asynchronous and don't cause this error.
EBS volume queue depth is too low causing I/O throttling
Low queue depth leads to I/O bottlenecks and rollback segments issues.
Answer choices
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
Option C is correct because EBS volume queue depth can cause I/O delays leading to transaction rollback. Option A is wrong as snapshot creation does not affect live database. Option B is wrong as DB parameter groups don't cause this error directly. Option D is wrong as Enhanced Networking is for network, not storage.
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.
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
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
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 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
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
Operations and Maintenance — This question tests Operations and Maintenance — Standard ACLs match source addresses..
The correct answer is: EBS volume queue depth is too low causing I/O throttling — Option C is correct because EBS volume queue depth can cause I/O delays leading to transaction rollback. Option A is wrong as snapshot creation does not affect live database. Option B is wrong as DB parameter groups don't cause this error directly. Option D is wrong as Enhanced Networking is for network, not storage.
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.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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