DBS-C01 Monitoring and Troubleshooting Practice Question
A company is running a production Amazon Aurora MySQL-Compatible Edition database. The database has recently experienced several failovers due to replica lag. The DBA needs to implement monitoring to detect replica lag early. Which THREE metrics should be monitored to assess replication health? (Select THREE.)
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
✓
DatabaseConnections
(DatabaseConnections) can indirectly indicate replication issues if application retries increase due to failovers. Option C (ReplicaLag) is the standard MySQL metric measuring replication lag. Option E (AuroraReplicaLag) is the direct Aurora-specific metric for replica lag. The other options are not directly related to replication health: ActiveTransactions (B) measures transaction volume, not replication lag, and BufferCacheHitRatio (D) is about cache efficiency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DatabaseConnections
Why this is correct
Increased DatabaseConnections can be a symptom of application retries during failover, making it an indirect indicator of replication issues.
- ✗
ActiveTransactions
Why it's wrong here
BufferCacheHitRatio measures cache efficiency and is not directly related to replication health.
- ✓
ReplicaLag
Why this is correct
ReplicaLag is the standard MySQL metric that directly measures the delay between the primary and replica databases.
- ✗
BufferCacheHitRatio
Why it's wrong here
ActiveTransactions reflects transaction volume but does not directly indicate replication lag or health.
- ✓
AuroraReplicaLag
Why this is correct
AuroraReplicaLag is the Aurora-specific direct metric for monitoring replica lag in an Aurora cluster.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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