PCDE Practice Question: Manage a solution that can span multiple database technologies
A team is managing a Memorystore for Redis instance that needs to scale to handle increased traffic. They want to ensure high availability and the ability to distribute data across multiple nodes. Which three actions should they take? (Choose 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
✓
Enable Redis Cluster on the instance to shard data across multiple nodes
Memorystore for Redis offers vertical scaling (changing tier) and horizontal scaling via Redis Cluster (enabling clustering). For HA, they can create a standard tier instance with replication (a read replica).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Cloud Storage snapshots for persistence
Why it's wrong here
Snapshots are for backup, not scaling.
- ✓
Enable Redis Cluster on the instance to shard data across multiple nodes
Why this is correct
Redis Cluster provides horizontal scaling and sharding.
- ✓
Upgrade the instance to a higher memory size by changing the tier
Why this is correct
Vertical scaling is possible by changing the tier.
- ✓
Create a read replica in a different zone for high availability
Why this is correct
Standard tier includes replication for HA.
- ✗
Enable AOF persistence
Why it's wrong here
AOF persistence is not available in Memorystore; also not for scaling.
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