The correct approach is to define appropriate distribution keys and sort keys, as these are the primary mechanisms for optimizing query performance in Amazon Redshift after Oracle migration. Unlike Oracle’s reliance on indexes and traditional partitioning, Redshift is a columnar, massively parallel processing (MPP) database where data distribution across nodes and physical sort order directly determine join efficiency, data skipping, and scan speed. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of how Redshift’s architecture differs from Oracle’s—a common trap is assuming that materialized views or indexes translate directly, but Redshift uses distribution keys to minimize data movement and sort keys to enable zone map pruning. Remember the mnemonic “D&S over I&P”: Distribution and Sort keys replace Indexes and Partitioning in Redshift.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 financial services company is migrating a 10 TB Oracle data warehouse to Amazon Redshift. The source database uses a combination of partitioned tables, indexes, and materialized views. The migration team plans to use AWS SCT and DMS. Which approach should the team take to optimize query performance after migration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Define appropriate distribution keys and sort keys
Option D is correct because Redshift uses distribution keys and sort keys for performance, not traditional indexes. Option A is wrong because Redshift does not support materialized views in the same way. Option B is wrong because indexes are not used in Redshift. Option C is wrong because partitioning in Redshift is done via distribution and sort keys, not like Oracle.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create indexes on frequently queried columns
Why it's wrong here
Redshift does not use indexes; it uses distribution and sort keys.
✗
Recreate all materialized views using standard views
Why it's wrong here
Redshift supports materialized views; standard views may not provide the same performance.
✓
Define appropriate distribution keys and sort keys
Why this is correct
These are the primary performance optimization mechanisms in Redshift.
Related concept
Static NAT maps one inside address to one outside address.
✗
Partition tables by date using the PARTITION BY clause
Why it's wrong here
Redshift does not support traditional partitioning; use distribution and sort keys.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Deployment and Migration — This question tests Deployment and Migration — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Define appropriate distribution keys and sort keys — Option D is correct because Redshift uses distribution keys and sort keys for performance, not traditional indexes. Option A is wrong because Redshift does not support materialized views in the same way. Option B is wrong because indexes are not used in Redshift. Option C is wrong because partitioning in Redshift is done via distribution and sort keys, not like Oracle.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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