DBS-C01 Management and Operations Practice Question
A company is running an Amazon RDS for MySQL Multi-AZ DB instance. The application experiences a brief write disruption during automatic failover. The database workload has low write latency requirements. Which configuration change would minimize application impact during failover?
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
✓
Change the DB instance to use a Multi-AZ DB cluster configuration.
Changing to a Multi-AZ DB cluster (option B) reduces application impact during failover because it uses a writer and two reader instances in separate Availability Zones. Failover to a reader is typically faster than the standard Multi-AZ standby failover, minimizing write disruption. Option A (promoting a read replica) is not automatic and introduces significant delay. Option C (single-AZ with backups) does not address failover impact. Option D (increasing instance class) does not significantly reduce failover time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a read replica in a different Availability Zone and promote it during failover.
Why it's wrong here
Promoting a read replica is manual and not automatic.
- ✓
Change the DB instance to use a Multi-AZ DB cluster configuration.
Why this is correct
Multi-AZ DB cluster provides faster failover than standard Multi-AZ.
- ✗
Use a single-AZ deployment and rely on automated backups for recovery.
Why it's wrong here
Single-AZ does not provide automatic failover.
- ✗
Increase the DB instance class to reduce failover time.
Why it's wrong here
Instance class does not affect failover time.
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