DBS-C01 Monitoring and Troubleshooting Practice Question
A developer notices that an Amazon ElastiCache for Redis cluster is experiencing high latency. The cluster uses a single node. Which CloudWatch metric should be reviewed first to determine if the issue is due to memory pressure?
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
✓
DatabaseMemoryUsagePercentage
The correct metric to check for memory pressure is DatabaseMemoryUsagePercentage. This metric shows the percentage of the node's available memory that is in use, and when high it can lead to latency due to evictions or swap usage. NetworkBytesIn measures network traffic, not memory. ReplicationLag is relevant only for clusters with replicas, and CPUUtilization indicates CPU load, not memory pressure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NetworkBytesIn
Why it's wrong here
NetworkBytesIn measures the amount of network traffic received by the node, which is not directly related to memory pressure.
- ✗
ReplicationLag
Why it's wrong here
ReplicationLag indicates the delay in replication between the primary and replica nodes. Since this cluster is single-node, there are no replicas, so this metric does not apply.
- ✗
CPUUtilization
Why it's wrong here
CPUUtilization shows the percentage of CPU usage, which can cause latency but is not a direct indicator of memory pressure.
- ✓
DatabaseMemoryUsagePercentage
Why this is correct
DatabaseMemoryUsagePercentage shows the percentage of the node's memory used. High usage can lead to memory pressure, causing latency due to evictions or swap.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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