PAS-C01 Native ASE Replication Practice Question
A company is migrating an SAP ERP system to AWS and needs to minimize downtime during the cutover. The database is SAP ASE. Which migration strategy is most appropriate?
⚠ Common exam trap
The trap is assuming AWS DMS is the best choice for minimizing downtime because it supports SAP ASE. However, native ASE replication provides even lower latency and a faster cutover, as it avoids the initial full data load required by DMS. The key is understanding that native replication is purpose-built for ASE-to-ASE synchronization and offers the shortest possible downtime.
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
✓
Use SAP ASE replication to replicate data to an EC2 instance running ASE, then cut over.
SAP ASE native replication (via Sybase Replication Server) allows continuous, real-time data synchronization from the on-premises ASE database to an EC2 instance running ASE in AWS. While AWS DMS supports SAP ASE as a source, it typically performs a full load followed by ongoing replication, which can introduce higher latency and longer cutover windows. In contrast, native replication minimizes downtime by keeping the target closely synchronized, requiring only a brief pause to apply final transactions and redirect clients.
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 SAP ASE replication to replicate data to an EC2 instance running ASE, then cut over.
Why this is correct
Correct. Native ASE replication provides continuous, real-time synchronization, allowing a very short cutover window by applying only final transactions.
- ✗
Create a nightly backup of the on-premises database, copy to AWS, and restore.
Why it's wrong here
Incorrect. Nightly backups result in data loss of up to 24 hours and require a long restore time, not minimizing downtime.
- ✗
Perform a full database export from on-premises and import into Amazon RDS for ASE.
Why it's wrong here
Incorrect. Full export/import is time-consuming and cannot achieve minimal downtime due to the large data volume and lack of ongoing sync.
- ✗
Use AWS Database Migration Service (DMS) with ongoing replication.
Why it's wrong here
AWS DMS does support SAP ASE as a source database, but it requires an initial full data load followed by ongoing replication. While this can minimize downtime, native ASE replication typically offers lower latency and a faster cutover because it avoids the full load phase and provides real-time synchronization. Thus, DMS is not the most appropriate strategy for minimizing downtime.
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