- A
Use synchronous replication with a lower sync timeout setting to avoid blocking.
Why wrong: Lower timeout may cause frequent timeouts and data loss.
- B
Configure HSR in asynchronous mode with full sync disabled to avoid affecting source transaction performance.
Asynchronous replication does not wait for acknowledgment, so source performance is unaffected; suitable for high-latency links.
- C
Keep synchronous replication but increase the replication timeout value in the HANA global.ini file.
Why wrong: Increasing timeout does not prevent performance impact; the source waits for acknowledgment.
- D
Enable HANA delta merge operations during replication to reduce the amount of data transferred.
Why wrong: Delta merge is an internal operation, not a replication setting.
SAP HANA System Replication with High Latency: Asynchronous Mode
This PAS-C01 practice question tests your understanding of technology. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An SAP Basis administrator is migrating an SAP ERP system from an on-premises environment to AWS. The system uses an SAP HANA database. The migration must have minimal downtime. The administrator plans to use SAP HANA System Replication (HSR) to synchronize data to an AWS HANA instance. However, the network latency between on-premises and AWS is consistently around 50 ms. What should the administrator do to ensure that HSR can maintain synchronization without impacting source system performance?
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
Configure HSR in asynchronous mode with full sync disabled to avoid affecting source transaction performance.
With 50 ms network latency, synchronous replication would block source transactions while waiting for acknowledgment from the target, severely impacting performance. Asynchronous mode with full sync disabled allows HSR to send log buffers without waiting for the target to confirm, ensuring source system performance is unaffected while still maintaining eventual consistency for migration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use synchronous replication with a lower sync timeout setting to avoid blocking.
Why it's wrong here
Lower timeout may cause frequent timeouts and data loss.
- ✓
Configure HSR in asynchronous mode with full sync disabled to avoid affecting source transaction performance.
Why this is correct
Asynchronous replication does not wait for acknowledgment, so source performance is unaffected; suitable for high-latency links.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Keep synchronous replication but increase the replication timeout value in the HANA global.ini file.
Why it's wrong here
Increasing timeout does not prevent performance impact; the source waits for acknowledgment.
- ✗
Enable HANA delta merge operations during replication to reduce the amount of data transferred.
Why it's wrong here
Delta merge is an internal operation, not a replication setting.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse synchronous replication with 'safer' replication, not realizing that high latency makes synchronous mode impractical for performance-sensitive source systems, and that 'full sync' is a separate HSR parameter controlling whether the secondary must be fully in sync before the primary commits.
Detailed technical explanation
How to think about this question
In HANA System Replication, synchronous mode (sync) requires the primary to wait for the secondary to confirm log writes before committing, which is sensitive to latency. Asynchronous mode (async) with full sync disabled (parameter: replication_use_full_sync = false) allows the primary to commit immediately after sending log buffers, relying on the secondary to catch up asynchronously. For migrations with high latency, this is the standard approach to balance data protection and performance.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure HSR in asynchronous mode with full sync disabled to avoid affecting source transaction performance. — With 50 ms network latency, synchronous replication would block source transactions while waiting for acknowledgment from the target, severely impacting performance. Asynchronous mode with full sync disabled allows HSR to send log buffers without waiting for the target to confirm, ensuring source system performance is unaffected while still maintaining eventual consistency for migration.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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