DBS-C01 Management and Operations Practice Question
A company is using Amazon RDS for MySQL with Multi-AZ deployment. The DBA receives an alert that the standby replica is lagging behind the primary. Which TWO actions should the DBA take to investigate the issue? (Choose TWO.)
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
✓
Verify network latency between the primary and standby.
The correct answers are B and C. In Amazon RDS Multi-AZ deployments, the standby replica is synchronously replicated from the primary, and the 'ReplicaLag' metric in CloudWatch is used to monitor the replication delay. Checking this metric (option C) helps identify lag. Additionally, verifying network latency between the primary and standby (option B) can uncover connectivity issues causing lag. Option A is incorrect because Multi-AZ does not have read replicas; Read Replicas are separate from the Multi-AZ standby. Option D is incorrect because storage size does not directly affect replication lag. Option E is incorrect because Multi-AZ uses synchronous replication, and changing to asynchronous would not solve the issue and is not a supported change for Multi-AZ.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the 'Replica Lag' metric for any read replicas.
Why it's wrong here
Multi-AZ does not use read replicas.
- ✓
Verify network latency between the primary and standby.
Why this is correct
High network latency can cause replication lag.
- ✓
Check the 'ReplicaLag' metric in Amazon CloudWatch.
Why this is correct
CloudWatch tracks replication lag for Multi-AZ.
- ✗
Increase the allocated storage to improve IOPS.
Why it's wrong here
Storage IOPS do not directly cause replication lag.
- ✗
Change the replication type from asynchronous to synchronous.
Why it's wrong here
Multi-AZ uses synchronous replication already.
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