PAS-C01 Operations and Maintenance Practice Question
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
'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.
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.
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 |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-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 PAS-C01 exam.