PAS-C01 Operations and Maintenance Practice Question
An SAP system uses a large Amazon RDS for Oracle instance. The operations team wants to minimize downtime during a major version upgrade. Which strategy should they use?
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
✓
Create a read replica, upgrade it, and then promote it to the primary
Using a read replica allows you to upgrade the replica and then promote it, minimizing downtime. Option A (taking a snapshot and restoring) has downtime. Option C (modifying the DB instance) causes downtime. Option D (using AWS DMS) requires complex setup and may introduce latency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Take a snapshot of the database and restore it as a new instance with the upgraded version
Why it's wrong here
Restoring from snapshot requires downtime.
- ✓
Create a read replica, upgrade it, and then promote it to the primary
Why this is correct
Minimizes downtime by failing over to the upgraded replica.
- ✗
Modify the DB instance and apply the upgrade immediately
Why it's wrong here
An immediate upgrade causes downtime during the modification.
- ✗
Use AWS Database Migration Service (DMS) to migrate to a new instance
Why it's wrong here
DMS can be used but involves more complexity and potential latency.
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