Question 743 of 1,446
Manage a solution that can span multiple database technologies →mediumMultiple SelectObjective-mapped
PCDE Practice Question: Manage a solution that can span multiple database technologies
You have a Memorystore for Redis instance used as a cache. You need to scale it to handle increased load. The current instance is Basic Tier with 2 GB memory. Which TWO actions can you take to scale the instance? (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
✓
Vertically scale the instance by increasing its memory size or changing to a higher-tier (e.g., Standard Tier).
Memorystore supports vertical scaling by increasing memory size or changing to a higher tier (e.g., Basic to Standard, or Standard to Standard with more memory) – this is option A. Horizontal scaling is achieved by enabling Redis Cluster, which automatically shards data across multiple nodes – this is option E. Option B (creating additional instances with client-side sharding) is not a supported scaling method for Memorystore because it requires manual management and is not integrated with the service. Option C (changing eviction policy to noeviction) does not scale the instance and risks data loss when memory is full. Option D (adding read replicas) is available only in Standard Tier, but it offloads read traffic, not scales the cache capacity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Vertically scale the instance by increasing its memory size or changing to a higher-tier (e.g., Standard Tier).
Why this is correct
Vertical scaling increases capacity by adding more memory to a single node.
- ✗
Create additional instances and implement client-side sharding.
Why it's wrong here
Client-side sharding is not a managed feature; Memorystore provides native Redis Cluster.
- ✗
Change the eviction policy to noeviction to allow more data.
Why it's wrong here
Changing eviction policy does not increase capacity; it only changes behavior when memory is full.
- ✗
Add read replicas to offload read traffic.
Why it's wrong here
Read replicas are not supported in Memorystore; replication is for high availability, not scaling read capacity for Redis.
- ✓
Enable Redis Cluster to horizontally scale across multiple shards.
Why this is correct
Redis Cluster distributes data across multiple nodes for horizontal scaling.
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Last reviewed: Jul 4, 2026
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