PAS-C01 Technology Practice Question
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?
⚠ Common exam trap
Many exam-takers 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.
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.
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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