DBS-C01 Management and Operations Practice Question
A company uses Amazon ElastiCache for Redis as a caching layer for a database. The cache cluster has one primary and one replica node. During a maintenance event, the primary node fails and the replica is promoted. After promotion, the application experiences increased latency. What should a database specialist do to reduce the impact of future failovers?
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
✓
Enable cluster mode and distribute the cache across multiple shards.
Enabling cluster mode on the ElastiCache for Redis cluster distributes data across multiple shards, each with its own primary and replica nodes. During a failover, only the data in the failed shard's primary needs to be rebuilt, limiting the cache miss impact. Adding more replicas (Option D) does not reduce the latency impact because a single primary still serves all requests after failover, and the new primary must warm its cache from scratch. Disabling replica reads (Option A) would not address the latency increase. Automatic backups (Option B) do not affect runtime performance after failover.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable replica reads to avoid stale data.
Why it's wrong here
This reduces read capacity but does not solve latency after failover.
- ✗
Enable automatic backups with a retention period of 35 days.
Why it's wrong here
Backups do not affect runtime performance.
- ✓
Enable cluster mode and distribute the cache across multiple shards.
Why this is correct
Cluster mode spreads data across shards, reducing the impact of a single node failure.
- ✗
Add more replica nodes to the cluster.
Why it's wrong here
More replicas do not reduce latency; the primary is still a single point.
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