PAS-C01 Operations and Maintenance Practice Question
An SAP system uses a Multi-AZ RDS for Oracle instance. During a recent failover, the application experienced a long outage because the SAP application server did not automatically reconnect to the new database endpoint. What is the most efficient way to resolve this issue?
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
✓
Reduce the DNS TTL for the RDS endpoint and ensure the application re-resolves DNS on connection failure.
The RDS endpoint remains the same after failover; the issue is DNS caching. Reducing the TTL ensures the application picks up the new IP quickly. Option B (rebooting) is disruptive and not a fix. Option C (modifying the connection string) is not needed. Option D (using a load balancer) adds complexity and 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.
- ✓
Reduce the DNS TTL for the RDS endpoint and ensure the application re-resolves DNS on connection failure.
Why this is correct
Low TTL and re-resolution enable fast failover recovery.
- ✗
Reboot the application server after every failover.
Why it's wrong here
Manual reboot is inefficient and causes downtime.
- ✗
Deploy an Application Load Balancer in front of the RDS instance.
Why it's wrong here
ALB is not designed for database connections.
- ✗
Modify the application connection string to use the standby instance IP directly.
Why it's wrong here
IP changes after failover; using IP is not recommended.
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