- A
Use AWS DMS to migrate the data with ongoing replication
Why wrong: DMS does not support Redis as a source.
- B
Take a snapshot of the source and restore to ElastiCache
Why wrong: Snapshot restore requires downtime and does not capture ongoing changes.
- C
Use the SAVE command to create a dump, upload to S3, and import to ElastiCache
Why wrong: SAVE is synchronous and may cause performance issues; BGSAVE is recommended.
- D
Set up replication from the source to ElastiCache using Redis replication
Replication allows minimal downtime by continuously syncing changes.
Question 642 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a self-managed Redis cluster that needs to be migrated to Amazon ElastiCache for Redis. The cluster is 100 GB in size and has a high write throughput. The migration must have minimal downtime. Which steps should be taken?
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
✓
Set up replication from the source to ElastiCache using Redis replication
Option D is correct because Redis replication (using the REPLICAOF or SLAVEOF command) allows you to set up the ElastiCache cluster as a read-replica of the self-managed Redis cluster, enabling continuous, asynchronous replication with minimal downtime. Once the replica is fully synchronized, you can promote it to the primary role with a brief failover, achieving a near-zero-downtime migration. This approach is ideal for a 100 GB cluster with high write throughput, as it avoids the performance impact of snapshotting or dump/restore operations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 AWS DMS to migrate the data with ongoing replication
Why it's wrong here
DMS does not support Redis as a source.
- ✗
Take a snapshot of the source and restore to ElastiCache
Why it's wrong here
Snapshot restore requires downtime and does not capture ongoing changes.
- ✗
Use the SAVE command to create a dump, upload to S3, and import to ElastiCache
Why it's wrong here
SAVE is synchronous and may cause performance issues; BGSAVE is recommended.
- ✓
Set up replication from the source to ElastiCache using Redis replication
Why this is correct
Replication allows minimal downtime by continuously syncing changes.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume AWS DMS is a universal migration tool for any data store, but it does not support Redis, making option A a tempting but incorrect choice.
Detailed technical explanation
How to think about this question
Redis replication works by having the replica issue a PSYNC command to initiate a partial or full synchronization from the primary, using the replication backlog and replication ID to minimize data transfer. For a 100 GB cluster, the initial full sync may take time and consume network bandwidth, but once complete, the replica stays in sync via incremental commands. In a real-world scenario, you would configure the ElastiCache cluster with the same node type and parameters (e.g., maxmemory-policy) as the source to avoid memory pressure during the sync, and use a VPN or VPC peering if the source is on-premises.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up replication from the source to ElastiCache using Redis replication — Option D is correct because Redis replication (using the REPLICAOF or SLAVEOF command) allows you to set up the ElastiCache cluster as a read-replica of the self-managed Redis cluster, enabling continuous, asynchronous replication with minimal downtime. Once the replica is fully synchronized, you can promote it to the primary role with a brief failover, achieving a near-zero-downtime migration. This approach is ideal for a 100 GB cluster with high write throughput, as it avoids the performance impact of snapshotting or dump/restore operations.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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