DBS-C01 Management and Operations Practice Question
A company is using Amazon RDS for PostgreSQL with read replicas to offload read traffic. The company wants to ensure that the read replicas are always in sync with the primary instance. Which metric should the company monitor to detect replication lag?
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
✓
ReplicaLag
The correct metric to monitor for replication lag in Amazon RDS for PostgreSQL read replicas is ReplicaLag. This metric is available in CloudWatch and directly indicates the time difference between the primary instance and the read replica. Option A (DiskQueueDepth) measures the number of pending I/O requests, not replication lag. Option C (TransactionLogsDiskUsage) measures the amount of transaction logs, which is related but not a direct lag metric. Option D (ReadLatency) measures the latency of read operations, not the synchronization delay.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DiskQueueDepth
Why it's wrong here
This metric measures the number of I/O operations waiting to be processed, not replication lag.
- ✓
ReplicaLag
Why this is correct
This metric shows the time difference between the primary and replica in seconds.
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TransactionLogsDiskUsage
Why it's wrong here
This metric is not provided by RDS.
- ✗
ReadLatency
Why it's wrong here
This measures the time for read operations, not replication lag.
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